PORTABLE FAN

Abstract

A portable bladeless fan is provided and includes: a housing, a mix-flow fan, and a pressurizing member. The housing has an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing. The mix-flow fan is configured to generate an airflow. The pressurizing member is connected to a front portion of the housing and disposed at a front of the mix-flow fan. The pressurizing member includes a pressurizing seat and second blades. The pressurizing seat includes a pressurizing surface that is at least partially increased in a radial direction from the rear side to the front side, the second blades are spaced apart from each other and are arranged on the pressurizing surface. The second blades re-arrange a direction of the airflow and to reduce a noise of the airflow.

Description

TECHNICAL FIELD

The present disclosure relates to the field of fans, and in particular to a portable fan.

BACKGROUND

In recent years, when people are having outdoor activities or in some certain scenarios, people may use fans. Various types of fans are available on the market, such as desktop table fans, floor fans, ceiling fans, hand-held fans, neck fans, clip fans, foldable fans, and so on. Portable fans are increasingly popularized in various scenarios. However, the portable fans in the art may be less reliable, have limited service life or provide poor user experience, and therefore, the portable fans need to be improved.

SUMMARY OF THE DISCLOSURE

The present disclosure provides a portable bladeless fan, including: a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing; a mix-flow fan, arranged inside the housing and configured to rotate about a rotation shaft to generate an airflow; a pressurizing member, connected to a front portion of the housing and disposed at a front of the mix-flow fan, wherein the pressurizing member comprises a pressurizing seat and a plurality of second blades, the pressurizing seat comprises a pressurizing surface that is at least partially increased in a radial direction from the rear side to the front side, the plurality of the second blades are spaced apart from each other and are arranged on the pressurizing surface, the plurality of the second blades are connected to the housing, the airflow generated by the mix-flow is capable of being converted into a high-pressure airflow after flowing through the pressurizing surface, the plurality of the second blades are configured to re-arrange a direction of the airflow and to reduce a noise of the airflow to convert a sharp sound into a low sound.

The present disclosure further provides a portable bladeless fan, including: a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing; a pressurizing member, connected to a front portion of the housing; a mix-flow fan, arranged inside the housing and connected to a rear of the pressurizing member, wherein the mix-flow fan is configured to rotate about a rotation shaft to generate an airflow; a booster, arranged inside the housing and surrounding a periphery of the mix-flow fan. A first channel is formed between the mix-flow fan and the booster, a second channel is formed between the pressurizing member and the housing, the first channel and the second channel cooperatively form a pressurizing conduction channel, the airflow is capable of flowing from the air inlet portion, passing through the pressurizing guiding channel, to reach the fan outlet portion.

The present disclosure further provides a portable bladeless fan, including: a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing, and a handle is arranged at a lower side of the housing; a pressurizing member, comprising a pressurizing seat and a plurality of second blades that are spaced apart from each other and are arranged on a radial outside of the pressurizing seat, wherein the pressurizing seat defines a first cavity having an opening facing to the rear side, the plurality of the second blades are connected to a front portion of the housing, and one of the plurality of second blades defines a wire-through slot communicating with the first cavity; a mix-flow fan, arranged inside the housing and connected to a rear side of the pressurizing member, wherein the mix-flow fan is configured to rotate about a rotation shaft to generate an airflow, the mix-flow fan comprises a motor, a rotation seat and a plurality of first blades, the plurality of the first blades are spaced apart from each other and are arranged on a radial outside of the rotation seat, the motor is configured to drive the rotation seat and the plurality of the first blades to rotate, the rotation seat defines a second cavity having an opening facing towards the front side, the motor is received in the first cavity and the second cavity; a main board, at least partially arranged inside the handle, wherein a wire is arranged to connect the motor to the main board; and the wire extends from the motor, passing through the wire-through slot, to the main board.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic circuit diagram of a master control chip of a master control circuit of a fan drive circuit according to a first embodiment of the present disclosure.

FIG. 2 is a schematic view of a three-phase drive circuit and a current detection circuit of the fan drive circuit according to the first embodiment of the present disclosure.

FIG. 3 is a schematic view of an inverted-phase electromotive force detection circuit of the fan drive circuit according to the first embodiment of the present disclosure.

FIG. 4 is a schematic view of an interface circuit and a charging management circuit of the fan drive circuit according to the first embodiment of the present disclosure.

FIG. 5 is a structural schematic view of an auxiliary chip of the master control circuit of the fan drive circuit according to the first embodiment of the present disclosure.

FIG. 6 is a schematic view of a circuit structure of an indicator branch and a key of the fan drive circuit according to the first embodiment of the present disclosure.

FIG. 7 is a schematic view of a first speed control member of the fan drive circuit according to the first embodiment of the present disclosure.

FIG. 8 is a schematic view of a second speed control member of the fan drive circuit according to the first embodiment of the present disclosure.

FIG. 9 is a schematic view of a master control circuit of a fan drive circuit according to a second embodiment of the present disclosure.

FIG. 10 is a schematic view of a three-phase drive circuit and a current detection circuit of the fan drive circuit according to the second embodiment of the present disclosure.

FIG. 11 is a schematic view of an inverted-phase electromotive force detection circuit of the fan drive circuit according to the second embodiment of the present disclosure.

FIG. 12 is a schematic view of a transistor-temperature detection circuit of the fan drive circuit according to the second embodiment of the present disclosure.

FIG. 13 is a schematic view of a battery voltage detection circuit of the fan drive circuit according to the second embodiment of the present disclosure.

FIG. 14 is a schematic view of a burn-in interface of the fan drive circuit according to the second embodiment of the present disclosure.

FIG. 15 is a schematic circuit diagram of a master control chip of a master control circuit of a fan drive circuit according to a third embodiment of the present disclosure.

FIG. 16 is a schematic view of a three-phase driving circuit and a battery voltage-and-current detection circuit of the fan drive circuit according to the third embodiment of the present disclosure.

FIG. 17 is a schematic view of three three-phase control chips of the master control circuit of the fan drive circuit according to the third embodiment of the present disclosure.

FIG. 18 is a schematic view of a signal amplification circuit of the fan drive circuit according to the third embodiment of the present disclosure.

FIG. 19 is a schematic view of a transistor-temperature detection circuit of the fan drive circuit according to the third embodiment of the present disclosure.

FIG. 20 is a schematic view of a light control circuit of the fan drive circuit according to the third embodiment of the present disclosure.

FIG. 21 is a schematic view of a Hall detection circuit of the fan drive circuit according to the third embodiment of the present disclosure.

FIG. 22 is a schematic view of a switch control circuit of the fan drive circuit according to the third embodiment of the present disclosure.

FIG. 23 is a schematic view of a direct current conversion circuit of the fan drive circuit according to the third embodiment of the present disclosure.

FIG. 24 is a schematic block diagram of the portable fan according to the embodiments of the present disclosure.

FIG. 25 is a perspective view of a portable fan according to an embodiment of the present disclosure.

FIG. 26 is a cross-sectional view of the portable fan according to the embodiment of the present disclosure.

FIG. 27 is an enlarged view of a portion A shown in FIG. 26.

FIG. 28 is a cross-sectional view of a portable fan according to another embodiment of the present disclosure.

FIG. 29 is a structural schematic view of a fan according to an embodiment of the present disclosure.

FIG. 30 is a structural schematic view of the fan having some components omitted, according to an embodiment of the present disclosure.

FIG. 31 is a structural schematic view of the fan, viewed from another viewing angle, according to an embodiment of the present disclosure.

FIG. 32 is a cross-sectional view of the fan according to an embodiment of the present disclosure.

FIG. 33 is a cross-sectional view of the fan, viewed from another viewing angle, according to an embodiment of the present disclosure.

FIG. 34 is a cross-sectional view of the fan according to another embodiment of the present disclosure.

FIG. 35 is a cross-sectional view of the fan, viewed from another viewing angle, according to another embodiment of the present disclosure.

FIG. 36 is a schematic view of an air feeding portion according to an embodiment 1 of the present disclosure.

FIG. 37 is an exploded perspective view of the air feeding portion shown in FIG. 36.

FIG. 38 is a cross-sectional view of the air feeding portion according to the embodiment 1 of the present disclosure.

FIG. 39 is a schematic view of a display according to an embodiment of the present disclosure.

FIG. 40 is a schematic view of an assembled inner shell according to an embodiment of the present disclosure.

FIG. 41 is a schematic view of a portable fan according to an embodiment 2 of the present disclosure.

FIG. 42 is a cross-sectional view of the portable fan according to the embodiment 2 of the present disclosure.

FIG. 43 is a perspective view of the portable fan according to an embodiment of the present disclosure.

FIG. 44 is an exploded view of the portable fan according to an embodiment of the present disclosure.

FIG. 45 is a perspective view of a hand-held fan according to an embodiment of the present disclosure.

FIG. 46 is a perspective view of the hand-held fan, viewed from another viewing angle, according to an embodiment of the present disclosure.

FIG. 47 is a perspective view of a partial structure of the hand-held fan according to an embodiment of the present disclosure.

FIG. 48 is an exploded view of the hand-held fan according to an embodiment of the present disclosure.

FIG. 49 is a schematic view of an airflow volume adjustment circuit according to an embodiment of the present disclosure.

FIG. 50 is another schematic view of an airflow volume adjustment circuit according to an embodiment of the present disclosure.

FIG. 51 is a perspective view of a hand-held fan according to an embodiment of the present disclosure.

FIG. 52 is a perspective view of the hand-held fan, viewed from another viewing angle, according to an embodiment of the present disclosure.

FIG. 53 is a perspective view of a partial structure of the hand-held fan according to an embodiment of the present disclosure.

FIG. 54 is an exploded view of the hand-held fan according to an embodiment of the present disclosure.

FIG. 55 is a schematic view of an airflow volume adjustment circuit according to an embodiment of the present disclosure.

FIG. 56 is another schematic view of an airflow volume adjustment circuit according to an embodiment of the present disclosure.

FIG. 57 is a schematic view of a hand-held fan according to an embodiment of the present disclosure.

FIG. 58 is an exploded view of the hand-held fan according to an embodiment of the present disclosure.

FIG. 59 is a schematic view of an air inlet cover according to an embodiment of the present disclosure.

FIG. 60 is a schematic view of formation of an air duct according to an embodiment of the present disclosure.

FIG. 61 is a schematic view of fan blades according to an embodiment of the present disclosure.

FIG. 62 is a bottom view of the air feeding portion according to an embodiment of the present disclosure.

FIG. 63 is a schematic view of a motor rotor shaft and fan blades being configured as a one-piece and integral structure, according to an embodiment of the present disclosure.

FIG. 64 is a schematic view of a vibration absorbing spring according to an embodiment of the present disclosure.

FIG. 65 is a schematic view of connection between a hand-held portion and the air feeding portion according to an embodiment of the present disclosure.

FIG. 66 is a perspective view of a hand-held fan according to an embodiment of the present disclosure.

FIG. 67 is an exploded view of a hand-held fan according to an embodiment of the present disclosure.

FIG. 68 is a perspective view of an air inlet cover of a hand-held fan according to an embodiment of the present disclosure.

FIG. 69 is a cross-sectional view of a hand-held fan along a line A-A, according to an embodiment of the present disclosure.

FIG. 70 is a perspective view of an air feeding assembly of a hand-held fan according to an embodiment of the present disclosure.

FIG. 71 is a perspective view of the air feeding assembly of a hand-held fan according to an embodiment of the present disclosure at another viewing angle.

FIG. 72 is a schematic view of a hand-held fan according to an embodiment of the present disclosure.

FIG. 73 is an exploded schematic view of a hand-held fan according to an embodiment of the present disclosure.

FIG. 74 is a schematic view of an air feeding portion according to an embodiment of the present disclosure.

FIG. 75 is a cross-sectional view of a hand-held fan according to an embodiment of the present disclosure.

FIG. 76 is a schematic view of an air feeding assembly according to an embodiment of the present disclosure.

FIG. 77 is a schematic view of an impeller assembly according to an embodiment of the present disclosure.

FIG. 78 is a schematic view of connection between a hand-held portion and an air feeding portion according to an embodiment of the present disclosure.

FIG. 79 is a schematic diagram of a motor drive control circuit module of a portable fan.

FIG. 80 is a schematic diagram of a voltage regulator unit circuit.

FIG. 81 is a schematic diagram of a motor drive control circuit.

FIG. 82 is a schematic diagram of a rotor position detection circuit.

FIG. 83 is a schematic diagram of a motor drive control unit circuit.

FIG. 84 is a schematic diagram of a master control unit circuit.

FIG. 85 is a schematic diagram of a display unit circuit.

FIG. 86 is a schematic diagram of a charging management circuit module of a portable fan.

FIG. 87 is a schematic diagram of a USB interface, fast-charging management unit circuit.

FIG. 88 is a schematic diagram of a charging management unit circuit.

FIG. 89 is a schematic diagram of a battery boost charging circuit module of a portable fan.

FIG. 90 is a schematic diagram of a circuit of a battery boost charging circuit boost module of a portable fan.

FIG. 91 is a schematic diagram of a charging voltage preset module, an over-temperature protection module, and a charging status indication module in a battery boost charging circuit of a portable fan.

FIG. 92 is a schematic diagram of a USB interface circuit in a battery boost charging circuit of a portable fan.

FIG. 93 is a schematic diagram of a signal transmission module in a battery boost charging circuit of a portable fan.

FIG. 94 is a perspective view of a portable bladeless fan according to a first embodiment of the present disclosure.

FIG. 95 is a decomposition schematic view of the portable bladeless fan according to the first embodiment of the present disclosure.

FIG. 96 is a decomposition schematic view of the portable bladeless fan according to the first embodiment of the present disclosure at another angle.

FIG. 97 is a cross-sectional view of the portable bladeless fan according to the first embodiment of the present disclosure.

FIG. 98 is a cross-sectional view of the portable bladeless fan according to the first embodiment of the present disclosure in another direction.

FIG. 99 is a schematic view of a front portion of a second housing, a pressurizing member, and a handle, and a wire ramp of a portable bladeless fan according to an embodiment of the present disclosure.

FIG. 100 is a perspective schematic view of a portable bladeless fan according to an embodiment of the present disclosure with a first housing removed.

FIG. 101 is a perspective view of a portable bladeless fan according to a second embodiment of the present disclosure.

FIG. 102 is a decomposition schematic view of the portable bladeless fan according to the second embodiment of the present disclosure.

FIG. 103 is a decomposition schematic view of the portable bladeless fan according to the second embodiment of the present disclosure at another angle.

FIG. 104 is a cross-sectional view of the portable bladeless fan according to the second embodiment of the present disclosure.

FIG. 105 is a cross-sectional view of the portable bladeless fan according to the second embodiment of the present disclosure in another direction.

FIG. 106 is a schematic view of a front portion of a second housing, a pressurizing member, and a handle, and a wire ramp of a portable bladeless fan according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Technical solutions of the embodiments of the present disclosure will be clearly and completely described below by referring to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are only a part of, not all of, the embodiments of the present disclosure. All of the embodiments, which are obtained by any ordinary skilled person in the art based on the embodiments of the present disclosure without any creative work, shall be within the scope of the present disclosure.

The terms “first”, “second”, and “third” in the specification and claims of the present disclosure and the drawings are used to distinguish between different objects, instead of describing a particular order. In addition, the term “comprising” and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, a method, a system, a product or an apparatus comprising a series of operations or units is not limited to the listed operations or units, but may further include operations or units that are not listed, or include other operations or units that are inherently included in the process, the method, the system, the product or the apparatus.

Embodiments of FIG. 1-FIG. 24 provide a portable fan and a fan drive circuit thereof.

As shown in FIG. 1 to FIG. 3, a first embodiment of the present disclosure provides a fan drive circuit. The fan drive circuit may be applied in various types of fans. Specifically, the fan drive circuit includes: a master control circuit 11, a three-phase drive circuit 12, and an inverted-phase electromotive force detection circuit 14.

The three-phase drive circuit 12 includes at least three signal input terminals 121 and three drive-signal output terminals 122. The at least three signal input terminals 121 are electrically connected to the master control circuit 11 to respectively receive control signals. The three drive-signal output terminals 122 are electrically connected to three signal terminals (U, V, and W) of a direct current (DC) brushless fan motor, respectively, to output three phases of drive signals to drive the DC brushless fan motor to operate. The inverted-phase electromotive force detection circuit 14 includes three detection branched circuits 141. Each of the three detection branched circuits 141 includes a detection terminal 1411 and a detection output terminal 1412 electrically connected to the detection terminal. Three detection terminals 1411 of the three detection branched circuits 141 are electrically connected to the three drive-signal output terminals 122, respectively. Three detection output terminals 1412 of the three detection branched circuits 141 are electrically connected to the master control circuit 11 to output a first detection signal, a second detection signal, and a third detection signal, respectively. In this way, the master control circuit is informed of a phase of each output drive signal based on the first detection signal, the second detection signal, and the third detection signal, such that the master control circuit may adjust the control signals.

As shown in FIG. 3, the detection branched circuit 141 includes a first detection resistor R1, a second detection resistor R2, and a third detection resistor R3. The first detection resistor R1 and the second detection resistor R2 are connected to each other in series. An end of the first detection resistor R1 away from the second detection resistor R2 is the detection terminal 1411. An end of the second detection resistor R2 away from the first detection resistor R1 is grounded. A node between the first detection resistor R1 and the second detection resistor R2 serves as the detection output terminal 1412.

Since the three-phase drive circuit 12 is arranged, energy-saving performance and control performance of the fan motor may be improved, and a service life of the fan drive circuit and a service life of the portable fan may be prolonged. The above-mentioned inverted-phase electromotive force detection circuit 14 enables the master control circuit 11 to be easily informed of the phase of the DC brushless fan motor. Therefore, the master control circuit 11 may send corresponding control signals to the three-phase drive circuit 12 to effectively control driving of the DC brushless fan motor, improve reliability and stability of the driving.

As shown in FIG. 2, the three-phase drive circuit 12 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6, a seventh transistor Q7, an eighth transistor Q8, and a ninth transistor Q9. A first conducted terminal 1211 of the first transistor Q1, a first conducted terminal 1211 of the second transistor Q2, and a first conducted terminal 1211 of the third transistor Q3 are connected to a power supply terminal 1212. A first conducted terminal 1211 of the fourth transistor Q4 is connected to the power supply terminal 1212. A first conducted terminal 1211 of the fifth transistor Q5 is connected to the power supply terminal 1212. A first conducted terminal 1211 of the sixth transistor Q6 is connected to the power supply terminal 1212. A control terminal of the fourth transistor Q4, a control terminal of the fifth transistor Q5, and a control terminal of the sixth transistor Q6 are electrically connected to the master control circuit 11. A control terminal of the seventh transistor Q7 is electrically connected to the control terminal of the fourth transistor Q4, a control terminal of the eighth transistor Q8 is electrically connected to the control terminal of the fifth transistor Q5, and a control terminal of the eighth transistor Q9 is electrically connected to the control terminal of the sixth transistor Q6. In this way, the seventh transistor Q7, the eighth transistor Q8, and the ninth transistor Q9 may receive the control signals. A second conducted terminal 1213 of the fourth transistor Q4, a second conducted terminal 1213 of the fifth transistor Q5, and a second conducted terminal 1213 of the sixth transistor Q6 are grounded. The first conducted terminal 1211 of the seventh transistor Q7 is connected to the second conducted terminal 1213 of the first transistor Q1. A second conducted terminal 1213 of the seventh transistor Q7 is grounded. The first conducted terminal 1211 of the eighth transistor Q8 is connected to the second conducted terminal 1213 of the second transistor Q2. A second conducted terminal 1213 of the eighth transistor Q8 is grounded. The first conducted terminal 1211 of the ninth transistor Q9 is connected to the second conducted terminal 1213 of the third transistor Q3. The second conducted terminal 1213 of the ninth transistor Q9 is grounded. A node between the first conducted terminal 1211 of the seventh transistor Q7 and the second conducted terminal 1213 of the first transistor Q1, a node between the first conducted terminal 1211 of the eighth transistor Q8 and the second conducted terminal 1213 of the second transistor Q2, and a node between the first conducted terminal 1211 of the ninth transistor Q9 and the second conducted terminal 1213 of the third transistor Q3 serve as the three drive-signal output terminals 122. The at least three signal input terminals 121 are three PWM signal input terminals, and the control signals include the three PWM signals.

As shown in FIG. 2, the fan drive circuit further includes a current detection circuit 15. The second conducted terminal 1213 of the seventh transistor Q7, the second conducted terminal 1213 of the eighth transistor Q8, and the second conducted terminal 1213 of the ninth transistor Q9 are all grounded via the current detection circuit 15. The current detection circuit 15 is further electrically connected to the master control circuit 11. The current detection circuit 15 includes a sensing resistor 151 and a sensing capacitor 152. The second conducted terminal 1213 of the seventh transistor Q7, the second conducted terminal 1213 of the eighth transistor Q8, and the second conducted terminal 1213 of the ninth transistor Q9 are grounded via the sensing resistor 151 and the sensing capacitor 152 successively. The node between the sensing resistor 151 and the sensing capacitor 152 is electrically connected to the master control circuit 11. The current detection circuit 15 enables the master control circuit 11 to control the fan drive circuit to stop operating or to operate at a lower power when an abnormal current is detected, such that the fan drive circuit is provided with a protection against overcurrent, and reliability and a service life of the fan drive circuit are improved.

As shown in FIG. 4 and FIG. 6, the fan drive circuit further includes an interface circuit 16 and a charging management circuit 17. The interface circuit 16 is configured to be electrically connected to an external power source to receive an external voltage. The charging management circuit 17 is electrically connected between the interface circuit 16 and a battery VBAT to receive the external voltage and to charge the battery VBAT or to output a supply voltage. The fan drive circuit further includes a key 31. An end of the key 31 is connected to the master control circuit 11, and the other end is grounded. The fan drive circuit further includes an indicator branched circuit 19. The indicator branched circuit 19 includes a light emitting diode (LED) and a resistor connected in series to the LED. A positive electrode of the LED is electrically connected to the master control circuit 11, a negative electrode of the LED is grounded.

Specifically, in the present embodiment, the fan drive circuit may be arranged in a neck fan, but is not limited to the neck fan. The fan drive circuit but may also be arranged in other portable fans, such as a desktop fan, a floor fan, a hand-held fan, a clip fan, a foldable fan, and so on. Each of a left side and a right side of the neck fan is arranged with one DC brushless fan motor. The DC brushless fan motor at the left side is configured to drive fan blades arranged at the left side of the neck fan, and the DC brushless fan motor at the right side is configured to drive fan blades arranged at the right side of the neck fan.

As shown in FIG. 1, FIG. 2 and FIG. 5, the master control circuit 11 may include a master control chip 111 and an auxiliary chip 113. Two three-phase drive circuits 12, two inverted-phase electromotive force detection circuit 14, and two DC brushless fan motors are arranged and are in one-to-one correspondence with each other. The master control chip 111 is electrically connected to one of the two three-phase drive circuits 12 to output the control signals to the one three-phase drive circuit 12 to drive a corresponding one of the two DC brushless fan motors. A corresponding one of the two inverted-phase electromotive force detection circuits 14 is electrically connected to the corresponding three-phase drive circuit 12 and outputs a corresponding first detection signal, a corresponding second detection signal, and a corresponding third detection signal to the master control chip 111. In this way, the master control chip 111 is informed of phases of the three-phase drive signal of the connected one three-phase drive circuit 12 and adjusts the control signals output to the connected one three-phase drive circuit 12 based on the phases. The auxiliary chip 113 is electrically connected to the other one of the two three-phase drive circuits 12 to output the control signals to the other three-phase drive circuit 12 to drive the other one of the two DC brushless fan motor corresponding to the other three-phase drive circuit 12. The other one of the two inverted-phase electromotive force detection circuits 14 is electrically connected to the other three-phase drive circuit 12 correspondingly to output a corresponding first detecting signal, a corresponding second detecting signal, and a corresponding third detection signal to the auxiliary chip 113. In this way, the auxiliary chip 113 is informed of phases of the three-phase drive signals of the other connected three-phase drive circuit 12 and adjusts the control signals output to the other connected three-phase drive circuit 12 based on the phases.

In the present embodiment, the master control chip 111, the three-phase drive circuit 12 corresponding thereto, and the inverted-phase electromotive force detection circuit 14 corresponding thereto are arranged on one module (such as on a first circuit board). In addition, the master control chip 111, the corresponding three-phase drive circuit 12, the corresponding inverted-phase electromotive force detection circuit 14, and the corresponding DC brushless fan motor may be disposed on a same side of the neck fan. The auxiliary chip 113, the three-phase drive circuit 12 corresponding to the auxiliary chip 113, and the inverted-phase electromotive force detection circuit 14 corresponding to the auxiliary chip 113 are arranged on another one module (such as, on a second circuit board separated from the first circuit board). The auxiliary chip 113, the corresponding three-phase drive circuit 12, the corresponding inverted-phase electromotive force detection circuit 14, and the corresponding DC brushless fan motor may be disposed on the other side of the neck fan. Understandably, the above arrangement is quite rationale and compact, and therefore, reliability of connection and driving is improved. However, the arrangement of the three-phase drive circuits 12, the inverted-phase electromotive force detection circuits 14, the master control chip 111, and the auxiliary chip 113 may be determined in various ways. For example, the two three-phase drive circuits 12, the two inverted-phase electromotive force detection circuits 14, the master control chip 111, and the auxiliary chip 113 may be arranged on one circuit board. Alternatively, the three-phase drive circuits 12 and the inverted-phase electromotive force detection circuits 14 are arranged on one circuit board, and the master control chip 111 and the auxiliary chip 113 are arranged on another one circuit board. Specific arrangement may be determined based on actual demands, which will not be described herein.

As shown in FIG. 7 and FIG. 8, the fan drive circuit further includes a first connector 261 and a speed adjustment interface circuit 26 having a second connector 262. A first pin and a second pin of the first connector 261 are electrically connected to the master control chip 111. A third pin of the first connector 261 is grounded. A first pin of the second connector 262 is connected to the battery VBAT via a first connection resistor, and is further connected to the auxiliary chip 113 via a second connection resistor. A second pin of the second connector 262 is connected to the auxiliary chip 113 via a third connection resistor, and a third pin of the second connector 262 is grounded. In addition, the pins of the first connector 261 and the pins of the second connector 262 may be electrically connected to each other one-to-one correspondingly, such that rotation speeds of the two DC brushless fan motors may be adjusted synchronously.

As shown in FIG. 9 to FIG. 14, a second embodiment of the present disclosure provides a fan drive circuit. Parts of the fan drive circuit of the present embodiment that are the same as the fan drive circuit in the first embodiment will not be repeated herein. Parts of the fan drive circuit of the second embodiment that are different from the fan drive circuit of the first embodiment will be focused in the following. Firstly, the master control circuit 11 of the second embodiment may substantially include the master control chip 111.

As shown in FIG. 10, in the second embodiment, the three-phase drive circuit 12 includes the first transistors Q1, the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6. The first conducted terminal 1211 of the first transistor Q1, the first conducted terminal 1211 of the second transistor Q2, and the first conducted terminal 1211 of the third transistor Q3 are all connected to the power supply terminal 1212. The first conducted terminal 1211 of the fourth transistor Q4 is connected to the second conducted terminal 1213 of the first transistor Q1. The first conducted terminal 1211 of the fifth transistor Q5 is connected to the second conducted terminal 1213 of the second transistor Q2. The first conducted terminal 1211 of the sixth transistor Q6 is connected to the second conducted terminal 1213 of the third transistor Q3. The node between the first conducted terminal 1211 of the fourth transistor Q4 and the second conducted terminal 1213 of the first transistor Q1, the node between the first conducted terminal 1211 of the fifth transistor Q5 and the second conducted terminal 1213 of the second transistor Q2, and the node between the first conducted terminal 1211 of the sixth transistor Q6 and the second conducted terminal 1213 of the third transistor Q3 serve as the three drive signal output terminals 122. The control terminal of the first transistor Q1, the control terminal of the second transistor Q2, the control terminal of the third transistor Q3, the control terminal of the fourth transistor Q4, the control terminal of the fifth transistor Q5, and the control terminal of the sixth transistor Q6 are electrically connected to the master control circuit 11 to receive the control signals. The control signals include six PWM signals.

As shown in FIG. 10, substantially the same as the first embodiment, the second conducted terminal 1213 of the sixth transistor Q6 is grounded via the current detection circuit 15, and the current detection circuit 15 is further electrically connected to the master control circuit 11. The current detection circuit 15 includes the sensing resistor 151 and the sensing capacitor 152. The second conducted terminal 1213 of the sixth transistor Q6 is grounded via the sensing resistor 151. The sensing capacitor 152 is connected in parallel with the sensing resistor 151. A node between the sensing resistor 151 and the second conducted terminal 1213 of the sixth transistor Q6 is electrically connected to the master control circuit 11. The current detection circuit 15 further includes a first series resistor 153, a second series resistor 154, and an parallel resistor 155. The parallel resistor 155 is connected in parallel with the sensing resistor 151. The first series resistor 153 is connected between an end of the sensing capacitor 152 and an end of the sensing resistor 151. The second series resistor 154 is connected between the other end of the sensing capacitor 152 and the other end of the sensing resistor 151. The current detection circuit 15 enables the master control circuit 11 to control the fan drive circuit to stop operating or to operate at a lower power when an abnormal current is detected, such that the fan drive circuit is provided with a protection against overcurrent, improving the reliability and the service life of the fan drive circuit.

As shown in FIG. 11, the inverted-phase electromotive force detection circuit 14 of the second embodiment is substantially the same as the inverted-phase electromotive force detection circuit 14 of the first embodiment, and will not be repeated herein.

As shown in FIG. 12, the fan drive circuit further includes a transistor-temperature detection circuit 24, the transistor-temperature detection circuit 24 may be disposed adjacent to each transistor of the three-phase drive circuit 12. The transistor-temperature detection circuit 24 includes a first voltage divider resistor 241 and a thermistor 242 that are connected to each other in series. The thermistor 242 is configured to detect a temperature of each transistor of the three-phase drive circuit 12. A node between the first voltage divider resistor and the thermistor 242 is electrically connected to the master control circuit 11 and is configured to output a temperature signal. In this way, the master control circuit 11 controls, based on the temperature signal, the fan drive circuit to enter or to not enter a temperature protection state. The thermistor 242 is connected between the first voltage divider resistor 241 and ground. The transistor-temperature detection circuit 24 further includes a voltage stabilizing capacitor 243 connected in parallel with the thermistor 242. The transistor-temperature detection circuit 24 enables the master control circuit 11 to be informed of whether the temperature of each transistor of the three-phase drive circuit 12 is abnormal. When the temperature of any transistor is abnormal, the transistor-temperature detection circuit 24 enables the master control circuit 11 to control the fan drive circuit to stop operating or operate at a lower power, such that the fan drive circuit is provided with a protection against overheat temperatures, and reliability and the service life of the fan drive circuit are improved.

As shown in FIG. 13, the fan drive circuit further includes a battery voltage detection circuit 25 that is electrically connected between the positive electrode of the battery VBAT and ground. An output terminal of the battery voltage detection circuit 25 is electrically connected to the master control circuit 11. The battery voltage detection circuit 25 enables the master control circuit 11 to be informed of whether a battery voltage is abnormal. When the battery voltage is abnormal, the battery voltage detection circuit 25 enables the master control circuit 11 to control the fan drive circuit to stop operating or to operate at a lower power, such that the reliability and the service life of the fan drive circuit are improved.

Specifically, the battery voltage detection circuit 25 includes a second voltage divider resistor 251 and a third voltage divider resistor 252 that are connected to each other in series. A node between the second voltage divider resistor 251 and the third voltage divider resistor 252 is electrically connected to the master control circuit 11. Understandably, the above battery voltage detection circuit 25 has a simple structure, a higher reliability, and a lower cost.

As shown in FIG. 14, the fan drive circuit of the second embodiment of the present disclosure further has a burn-in interface 28 configured to burn in a control program to the master control circuit 11. The burn-in interface 28 may be a SWD burn-in interface, but is not limited to the above.

As shown in FIG. 15 to FIG. 16, a third embodiment of the present disclosure provides a fan drive circuit. Parts of the fan drive circuit of the present embodiment that are the same as the fan drive circuit in the second embodiment will not be repeated herein. Parts of the fan drive circuit of the second embodiment that are different from the fan drive circuit of the second embodiment will be focused in the following.

As shown in FIG. 15-FIG. 17, the three-phase drive circuit 12 of the third embodiment is substantially the same as the three-phase drive circuit 12 of the second embodiment. The master control circuit 11 of the third embodiment is different from that of the second embodiment, the master control circuit 11 in the present embodiment includes the master control chip 111 and three three-phase control chips 112, and each of the three three-phase control chips 112 is electrically connected to the master control chip 111 and the three-phase drive circuit 12.

As shown in FIG. 16 and FIG. 18, the fan drive circuit further includes a filter capacitor 253 and a sampling resistor 254 that are connected to each other in series. The sampling resistor 254 is connected between the filter capacitor 253 and the ground. A node between the filter capacitor 253 and the sampling resistor 254 is electrically connected to the master control circuit 11. Further, the fan drive circuit further includes a signal amplification circuit 29. An input terminal of the signal amplification circuit 29 is connected to the node between the filter capacitor 253 and the sampling resistor 254. The signal amplification circuit 29 is configured to amplify a signal sampled by the sampling resistor 254 (i.e., the signal of the node between the filter capacitor 253 and the sampling resistor 254); and configured to provide the amplified signal to the master control circuit 11. In this way, the master control circuit 11 of the fan drive circuit may incisively detect an abnormal voltage signal or an abnormal current signal when the fan drive circuit is abnormal, such that the master control circuit 11 may perform protection tasks against the abnormalities, such as controlling the fan to stop operating or to run at a reduced speed, and therefore, the safety of the fan drive circuit is improved.

As shown in FIG. 19, the transistor-temperature detection circuit 24 of the third embodiment is substantially the same as in the second embodiment, and will not be repeated herein.

As shown in FIG. 20, FIG. 20 is a schematic view of a light control circuit 30 of the fan drive circuit in the third embodiment. The light control circuit 30 includes a light-emitting element 301 and a control switch 302. A positive electrode of the light-emitting element 301 receives a drive voltage, and a negative electrode of the light-emitting element 301 is grounded via a resistor and two conducted terminals of the control switch 302. A control terminal of the control switch 302 is electrically connected to the master control circuit 11, such that the master control circuit 11 outputs a light control signal to the control terminal of the control switch 302 to control the light-emitting element 301 to emit light.

As shown in FIG. 21, the fan drive circuit further includes a Hall detection circuit 23. The Hall detection circuit 23 is electrically connected to the master control circuit 11 to detect a magnetic field generated by the DC brushless fan motor and to output a Hall detection signal to the master control circuit 11. In this way, the master control circuit 11 is informed of a position of a rotor of the DC brushless fan motor based on the Hall detection signal, and therefore, the master control circuit 11 provides corresponding control signals to control the operation of the three-phase drive circuit 12. In this way, a startup time of the fan configured with the fan drive circuit is shorter, and the fan may not shake during being started up, and the user experience is improved.

As shown in FIG. 21, the Hall detection circuit 23 further includes a motor-temperature detection element 232 connected between a Hall element 231 of the Hall detection circuit 23 and the master control circuit 11. The motor-temperature detection element 232 may be a sampling resistor. The motor-temperature detection element 232 enables the master control circuit 11 to be informed of whether the temperature of the DC brushless fan motor is abnormal. When the temperature of the DC brushless fan motor is abnormal, the master control circuit 11 may control the fan drive circuit to stop operating or to operate at a lower power, such that the fan drive circuit is provided with a protection against overheat temperatures, improving the reliability and the service life of the fan drive circuit.

As shown in FIG. 17 and FIG. 22, the fan drive circuit further includes a voltage conversion circuit 20, the voltage conversion circuit 20 is configured to: receive a battery voltage (VB+); convert the battery voltage to the drive voltage (such as 15V); and provide the drive voltage to a power supply terminal of each of the three three-phase control chips 112. The master control chip 111 is configured to output a master control signal to the three three-phase control chips 112, enabling each of the three three-phase control chips 112 to output a respective control signal to the corresponding three-phase drive circuit 12.

The fan drive circuit further includes a switch control circuit 21. The switch control circuit 21 is electrically connected to the battery VBAT, the voltage conversion circuit 20, and the master control circuit 11 to control the operation of the voltage conversion circuit 20. The switch control circuit 21 includes a key 211, a first switch transistor 212, a second switch transistor 213, and a third switch transistor 214. Two conducted terminals of the first switch transistor 212 are connected to the positive electrode of the battery VBAT and an input terminal of the voltage conversion circuit 20, respectively. A control terminal of the first switch transistor 212 is grounded via two conducted terminals of the third switch transistor 214. The positive electrode of the battery VBAT is connected to the control terminal of the third switch transistor 214 via the two conducted terminals of the first switch transistor 212 and a unilateral diode 215. A control terminal of the second switch transistor 213 is grounded via the key 211. A control terminal of the third switch transistor 214 is electrically connected to the master control circuit 11. A node between the second switch transistor 213 and the unilateral diode 215 is further electrically connected to a switch signal terminal of the master control circuit 11.

When the key 211 is pressed and conducted, the second switch transistor 213 is conducted, the third switch transistor 214 is conducted, the node between the second switch transistor 213 and the unidirectional diode 215 outputs a first switch signal (ON) to the switch signal terminal of the master control circuit 11, and the first switch transistor 212 is conducted. In this way, the battery voltage of the battery VBAT is supplied to the voltage conversion circuit 20. When the button 211 is not pressed, the second switch transistor 213 is disconnected, the master control circuit 11 outputs, based on the first switch signal, a power-supply switch-on signal to the control terminal of the third switch transistor 214 to maintain the third switch transistor 214 to be conducted, and the battery voltage of the battery VBAT is supplied to the voltage conversion circuit 20.

Further, in a case that the battery voltage of the battery VBAT is supplied to the voltage conversion circuit 20, when the key 211 is again pressed to be conducted, the node between the second switch transistor 213 and the unidirectional diode 215 outputs a second switch signal (OFF) to the switch signal terminal of the master control circuit 11. The master control circuit 11 outputs, based on the second switch signal, a power-supply switch-off signal to the control terminal of the third switch transistor 214 to switch off the third switch transistor 214. In this way, the first switch transistor 212 is switched off, the battery voltage of the battery VBAT cannot be supplied to the voltage conversion circuit 20 until the key 211 is again pressed on.

The master control circuit 11 controls, cooperatively through the key 211, the first switch transistor 212, the second switch transistor 213 and the third switch transistor 214, whether the battery voltage of the battery VBAT is supplied to the voltage conversion circuit 20. The control logic is simple and is highly reliable.

As shown in FIG. 23, the fan drive circuit further includes a DC conversion circuit 22. The DC conversion circuit 22 is configured to receive the drive voltage (such as a DC voltage of 15V) and convert the drive voltage to other DC operating voltages, such as a DC operating voltage of 3.3V and a DC operating voltage of 5V.

As shown in FIG. 24, the present disclosure further provides a portable fan 2. The portable fan 2 includes the fan drive circuit 3, the DC brushless fan motor 4, and fan blades 5 driven by the DC brushless fan motor. The fan drive circuit 3 is the fan drive circuit described in any of the above embodiments.

Compared to the prior art, in the fan drive circuit and the portable fan 2 in the above embodiment, the master control circuit 11, the three-phase drive circuit 12, the inverted-phase electromotive force detection circuit 14, and the DC brushless fan motor are arranged, and in this way, the energy-saving performance and the control performance of the fan motor may be improved, and the reliability of the fan drive circuit and the fan 2 may be improved. Furthermore, the service life of the fan drive circuit and the portable fan 2 may be prolonged. By arranging the DC brushless fan motor, the portable fan 2 has a simpler and smaller size, improving market competitiveness of the product.

Embodiment of FIG. 25-FIG. 28 provide a small-sized portable fan.

As shown in FIG. 25 and FIG. 26, a schematic view of a portable fan is shown. The portable fan includes a housing 1, a fan assembly 2, a motor 3, and a drive circuit board 4. The housing 1 defines an air inlet 161, a receiving cavity 162, and an air outlet 163, where the air inlet 161, the receiving cavity 162, and the air outlet 163 are communicated with each other. The fan assembly 2, the motor 3, and the drive circuit board 4 are arranged inside the housing 1. The drive circuit board 4 is electrically connected to the motor 3 to drive the fan assembly 2 to rotate to guide air flowing from the air inlet 161, flowing through the receiving cavity 162, to reach the air outlet 163.

As shown in FIG. 25 and FIG. 26, the housing 1 includes a front housing 11 and a rear housing 12. The front housing 11 includes a first airflow housing 111 and a first hand-held housing 112. The rear housing 12 includes a second airflow housing 121 and a second hand-held housing 122. The first airflow housing 111 and the second airflow housing 121 cooperatively form an air outlet portion 16. The first hand-held housing 112 and the second hand-held housing 122 cooperatively form a hand-held portion 17. Understandably, the first airflow housing 111 and the second airflow housing 121 may be engaged with each other in a front-rear direction or in a left-right direction. The first hand-held housing 112 and the second hand-held housing 122 may be engaged with each other in a front-rear direction or in a left-right direction. The -held portion 17 is arranged with a switch 5, an interface 6, and a battery 7. In the present embodiment, the switch 5 is a stepless speed adjusting switch 5. Of course, in other embodiments, the first hand-held housing 112 and the second hand-held housing 122 may be omitted, alternatively, the fan may be configured as a desktop fan, a neck fan, a clip fan, a bracket fan, or fans in other types.

As shown in FIG. 26, the first airflow housing 111 includes a first outer housing and a first inner housing engaged with the first outer housing. The first inner housing is attached to the first outer housing. Each of the first inner housing and the first outer housing is extending horizontally toward the front. The second airflow housing 121 includes a second outer housing and a second inner housing engaged with the second outer housing. A rear end of the second inner housing is spaced apart from a rear end of the second outer housing and is connected to the rear end of the second outer housing through a connecting member. The second outer housing extends horizontally toward the front, and expands outwardly in a radial direction from the rear to the front. A front end of the second inner housing is connected to a front end of the second outer housing. The front end of the second inner housing abuts against the rear end of the first inner housing. In the present embodiment, the first inner housing and the second outer housing are configured as a one-piece and integral structure. Of course, in other embodiments, the first outer housing and the second outer housing may be detachable from each other. Each of the first airflow housing 111 and the second airflow housing 121 is a double-layer housing, therefore, the first airflow housing 111 and the second airflow housing 121 are more structurally stable. In addition, a change in a shape of the second inner housing allows the airflow to be pressurized, and therefore, the airflow is more strong and a flowing distance of the airflow is longer. Of course, in other embodiments, the first airflow housing 111 and/or the second airflow housing 121 may be a single-layer housing.

As shown in FIG. 25 and FIG. 26, the housing 1 further includes a pressurizing member 13 disposed within the first airflow housing 111. A plurality of connecting vanes 14 connect the pressurizing member 13 to the front housing 11. A base 131 and a sleeve 132 are arranged inside the pressurizing member 13. The base 131 is disposed between a front end and a rear end of the pressurizing member 13. Inside the pressurizing member 13, the base 131 defines a reservation space 1321 towards the rear end. Inside the pressurizing member 13, the base 131 has a receiving portion 1322 extending towards the front end. The sleeve 132 protrudes from the base 131 toward the receiving cavity 162, i.e., the sleeve 132 protrudes from the base 131 towards the rear end, and the sleeve 132 is hollow.

As shown in FIG. 25 and FIG. 26, the air inlet 161 is located at an inner region of the second inner housing in a radial direction. The air outlet 163 is located at a region between the pressurizing member 13 and the first inner housing in the radial direction. The fan assembly 2 includes a hub 21 and a plurality of fan blades 22. The plurality of fan blades 22 are spaced apart from each other and are disposed on an outer surface of the hub 21. The hub 21 includes an airflow guiding surface 212 that is enlarged in the radial direction from the rear to the front. The pressurizing member 13 includes a pressurizing surface 133 that is enlarged in the radial direction from the rear to the front. The airflow guiding surface 212 and the pressurizing surface 133 are in close proximity to each other and are spaced apart from each other to allow the airflow to flow smoothly towards the front. The air flows from the air inlet 161 to the air outlet 163 to form an air duct that extends outwardly in the radial direction, such that the airflow is pressurized inside the housing 1, and a relatively larger air outlet surface is formed.

As shown in FIG. 25, the fan assembly 2 includes a hub 21 and a plurality of fan blades 22. The plurality of fan blades 22 are spaced apart from each other and are disposed on an outer surface of the hub 21. A rotation shaft 23 is fixedly disposed at a center of an inside of the hub 21. The motor 3 includes a stator 31 and a rotor 32. The stator 31 and the rotor 32 are both received inside the hub 21. Further, the hub 21 includes a ring-shaped extending wall 211 that extends along the hub 21 for one loop. The stator 31 and the rotor 32 are both received in the extending wall 211. The stator 31 sleeves an outside of the sleeve 132. The stator 31 includes a coil 311. The rotor 32 is disposed between the stator 31 and the hub 21 in the radial direction. The rotation shaft 23 is inserted in the sleeve 132 and extends along the extending wall 211, the stator 31, and the rotor 32 forwardly to be received in the reservation space 1321.

As shown in FIG. 25 and FIG. 26, the extending wall 211 extends forwardly beyond the airflow guiding surface 212. The airflow guiding surface 212 and the pressurizing surface 133 are in close proximity to each other and are spaced apart from each other. Therefore, the gap between the airflow guiding surface 212 and the pressurizing surface 133 misaligns with a front end of the extending wall 211, and reduced dust may be accumulated in the extending wall 211. Neither the stator 31 nor the rotor 32 extends forwardly beyond the extending wall 211. The extending wall 211, the stator 31 and the rotor 32 extend forwardly to be received in the reservation space 1321, such that the extending wall 211, the stator 31 and the rotor 32 are partially received in the reservation space 1321.

As shown in FIG. 25 and FIG. 26, the drive circuit board 4 is not disposed between the base 131 and the stator 31. The battery 7 is electrically connected to the drive circuit board 4. The drive circuit board 4 is electrically connected to a lead of the coil 311 to drive the fan assembly 2 to rotate, guiding the air from the air inlet 161 to flow through the receiving cavity 162 and to reach the air outlet 163. In the present embodiment, the drive circuit board 4 is received in the receiving portion 1322 that is formed by the base 131 and faces the front. The front end of the pressurizing member 13 further includes a front cover 15, the front cover 15 covers a front end of the receiving portion 1322. The front cover 15 is recessed towards the rear to form a negative pressure region 151. By arranging the front cover 15, on the one hand, the front cover 15 covers the receiving portion 1322 and shields and protects the drive circuit board 4; and on the other hand, the front cover 15 is recessed towards the rear to form a negative pressure region 151, such that air may be compensated to the air outlet 163 to increase an air volume of the air outlet 163.

As shown in FIG. 25, in the present embodiment, the motor 3 is a three-phase motor. The coil 311 includes twelve windings. The number of the windings is relatively large. Therefore, a space inside the motor 3 is limited. Since the drive circuit board 4 is not disposed between the base 131 and the stator 31, electrical connection between the lead of the coil 311 and the drive circuit board 4 is achieved more simply and more conveniently. In addition, the space between the base 131 and the stator 31 may be further reduced, such that the internal space of the portable fan may be distributed more reasonably, and miniaturization of the portable fan may be achieved.

In another embodiment, the drive circuit board 4 is received in the hand-held portion 17 and is disposed between the switch 5 and the interface 6. The switch 5 is connected to the drive circuit board 4, or the interface 6 is connected to the drive circuit board 4. The other structures and performances of the present embodiment are substantially the same as the previous embodiment, and will not be repeated herein.

FIG. 28 is a schematic view of the portable fan according to still another embodiment. In the present embodiment, the drive circuit board 4 is received inside the hand-held portion 17 and is located below the battery 7. The other structures and performances of the present embodiment are substantially the same as the previous embodiment, and will not be repeated herein.

Embodiments of FIG. 29 to FIG. 35 provide a hand-held fan.

As shown in FIG. 29 to FIG. 35, the present disclosure provides a fan, including: an air duct portion 10, an air blowing portion 20, and a hand-held portion 30. The air duct portion 10 includes a body, and the body defines an air guiding cavity 13. Two opposite ends of the air duct portion 10 respectively defines an air outlet 121 and an air inlet 111. The air outlet 121 and the air inlet 111 are both communicated with the air guiding cavity 13. A positioning post 122 is arranged inside the body. The air blowing portion 20 includes rotating blades 21 and a drive portion 22 that is connected to the rotating blades 21 and drives the rotating blades 21 to rotate. The rotating blades 21 are rotatably mounted in the air guiding cavity 13 and is disposed facing toward the air outlet 121. The drive portion 22 includes a stator 221 and a rotor 222 sleeves an outside of the stator 221. The rotor 222 is fixedly arranged on the rotating blades 21 and is coaxial with the rotating blades 21. The stator 221 fixedly sleeves the positioning post 122. The hand-held portion 30 is connected to the air duct portion 10. The hand-held portion 30 defines a mounting cavity 34. A power supply assembly 31 is arranged inside the mounting cavity 34. The power supply assembly 31 is electrically connected to the drive portion 22. In the present embodiment, the drive portion 22, which is drivingly connected to the rotating blades 21, of the fan includes the stator 221 and the rotor 222 sleeving the outside of the stator 221, and the rotor 222 is fixedly arranged on the rotating blades 21 and is coaxially arranged with the rotating blades 21. In addition, the stator 221 fixedly sleeves the positioning post 122. In this way, in the present embodiment, a power generated by the drive portion 22 is directed to the rotating blades 21 through the rotor 222, without arranging any transmission element between the drive portion 22 and the rotating blades 21. Therefore, a transmission efficiency of the fan of the present embodiment is effectively improved.

In an embodiment, the power supply assembly 31 is a storage battery.

As shown in FIG. 29 and FIG. 33, in an embodiment, the body of the present embodiment includes a first housing 11 and a second housing 12. The first housing 11 is connected to the second housing 12. The air guiding cavity 13 is defined between the first housing 11 and the second housing 12. The first housing 11 defines the air inlet 111, and the second housing 12 defines the air outlet 121. The positioning post 122 is arranged on the second housing 12 and is extending along an extension direction of the air guiding cavity 13.

As shown in FIG. 32 to FIG. 35, in an embodiment, the rotating blades 21 defines a fixation hole. An axis of the fixation hole coincides with a rotation axis of the rotating blades 21. The air blowing portion 20 further includes a rotating shaft 23. A first end of the rotating shaft 23 is fixedly threaded in the fixation hole. The positioning post 122 defines a positioning hole 1221 inside the positioning post 122. An axis of the positioning hole 1221 coincides with an axis of the rotating shaft 23. A second end of the rotating shaft 23 is rotatably threaded in the positioning hole 1221.

As shown in FIG. 32 to FIG. 35, in order to improve a service life of the fan in the present embodiment, the air blowing portion 20 in the present embodiment further includes a bearing portion 24. An outer ring of the bearing portion 24 is fixedly received in the positioning hole 1221, and an inner ring of the bearing portion 24 sleeves the second end of the rotating shaft 23. In the present embodiment, the bearing portion 24 is disposed between the positioning hole 1221 and the rotating shaft 23, the outer ring of the bearing portion 24 is fixedly received in the positioning hole 1221, and the inner ring sleeves the second end of the rotating shaft 23. In this way, direct friction between the positioning hole 1221 and the rotating shaft 23 may be avoided, and the service life of the fan in the present embodiment may be effectively improved.

As shown in FIG. 32 and FIG. 33, in an embodiment, the bearing portion 24 includes a rolling bearing. The air blowing portion 20 further includes a limiting member 25. The limiting member 25 is arranged on the second end of the rotating shaft 23. The bearing portion 24 is disposed between the limiting member 25 and the first end of the rotating shaft 23. By arranging the limit member 25 on the second end of the rotating shaft 23, a radial shift of the rolling bearing may be effectively limited.

As shown in FIG. 32 and FIG. 33, in an embodiment, in order to facilitate mounting of the rolling bearing, a plurality of bearing sections 24 are arranged, an inner side wall of the positioning hole 1221 is arranged with at least one inner flange 12211, and each inner flange 12211 is disposed between two adjacent bearing portions 24 of the plurality of bearing sections 24. In this way, the two adjacent bearing portions 24 are spaced apart from each other. In the present embodiment, since the limiting member 25 is arranged on the second end of the rotating shaft 23, the inner ring of the rolling bearing may be effectively limited. Since the inner flange 12211 is arranged on the inner side wall of the positioning hole 1221, the outer ring of the bearing may be effectively limited. Therefore, the rolling bearing in the present embodiment may be effectively mounted.

In an embodiment, the bearing portion 24 is a ball bearing, and a lubricant is provided in the ball bearing.

In an embodiment, the bearing portion 24 is a ceramic bearing, and a lubricant is provided in the ceramic bearing.

In an embodiment, the bearing portion 24 is a magnetic levitation bearing.

In an embodiment, the air blowing portion 20 further includes an elastic member. The elastic member in the present embodiment sleeves the rotating shaft 23. Two ends of the elastic member are respectively abuts against the inner ring of the rolling bearing and the rotating blades 21. The elastic member applies an elastic force on the inner ring of the rolling bearing in a direction away from the air inlet 111. The elastic member provided in the present embodiment may pre-tension the rolling bearing, such that the service life of the rolling bearing is effectively increased.

As shown in FIG. 34 and FIG. 35, in an embodiment, in order to improve the service life of the fan, the bearing portion 24 includes a slide bearing. The air blowing portion 20 further includes two sealing rings 26. The two sealing rings 26 both sleeve the rotating shaft 23 and are respectively disposed on two sides of the slide bearing. In the present embodiment, the sliding bearing is disposed between the rotating shaft 23 and the positioning hole 1221, the inner ring of the slide bearing is fixedly connected to the second end of the rotating shaft 23, and the outer ring is fixedly connected to the fixation hole. In this way, the friction between the rotating shaft 23 and the positioning hole 1221 may be converted into friction between the inner ring and the outer ring of the slide bearing, avoiding the friction between the rotating shaft 23 and the positioning hole 1221 and thus effectively improving the service life of the fan.

As shown in FIG. 32 to FIG. 35, in an embodiment, the hand-held portion 30 includes a third housing 32 and a fourth housing 33 connected to the third housing 32. The mounting cavity 34 is defined between the third housing 32 and the fourth housing 33.

As shown in FIG. 32 to FIG. 35, in an embodiment, the first housing 11 includes a housing body 112 and an air-duct inner lining 113. The air-duct inner lining 113 is arranged on the housing body 112. The air-duct inner lining 113 defines an air duct 1131 therein. The air guiding cavity 13 is defined between the air-duct inner lining 113 and the second housing 12.

Since a cost of a single-phase motor is low, the hand-held fan on the market is usually driven by the single-phase motor. However, the single-phase motor has a low rotation speed and is unable to provide a strong wind, and therefore, the user experience is poor. In order to improve strength of the wind of the hand-held fan, a high-speed motor is required to drive the fan. However, the high-speed motor is large sized and occupies a large space, and may be worn easily.

In order to solve the above problem, the drive portion 22 in the present embodiment is a three-phase motor. By configuring the three-phase motor as the drive portion 22, a rotation speed of the rotating blades 21 may be effectively increased, allowing the fan in the present embodiment to provide a stronger wind, effectively improving the user experience. In addition, due to the high rotation speed of the three-phase motor, in order to avoid sharp wearing between the rotating shaft and the positioning hole due to high-speed rotation and to ensure the service life of the fan, the bearing portion is disposed between the positioning hole and the rotating shaft in the fan of the present embodiment. The bearing portion enables the friction between the positioning hole and the rotating shaft to be converted from sliding friction to rolling friction inside the bearing portion, such that worn of the positioning hole and the rotating shaft may be avoided, and the service life of the fan of the present embodiment may be improved effectively.

As shown in FIG. 29 to FIG. 35, in an embodiment, the hand-held portion 30 is arranged with a charging port 35. The charging port 35 is electrically connected to the power supply assembly 31. By arranging the charging port 35 on the hand-held portion 30 and by electrically connecting the charging port 35 to the power supply assembly 31, the power supply assembly 31 in the present embodiment may be electrically connected to an external power supply through the charging port 35, ensuring a battery endurance of the fan of the present embodiment.

In an embodiment, the hand-held portion of the present embodiment is arranged with a discharging port. The discharging port in the present embodiment is electrically connected to the power supply assembly and is electrically connected to an external electronic device to transfer electric power of the power supply assembly to the external electronic device.

In an embodiment, a grille assembly is arranged at the air inlet. The grille assembly in the present embodiment includes a first grille member and a second grille member. The first grill member is fixedly connected to the first housing, and the second grill member is pivotally connected to the first grill member. The first grill member defines a plurality of first openings, and the second grill member defines a plurality of second openings. The plurality of first openings and the plurality of second openings are in one-to-one correspondence with each other. The second grille member may be in a masking state of completely masking the first openings and in an open state in which the second openings overlap with the first opening. The second grille member may be rotated to be switched between the masking state and the open state. The grille assembly in the present embodiment effectively regulates the amount of air intaken into the air inlet, effectively improving the user experience.

In an embodiment, the air duct portion 10 and the hand-held portion 30 are fixedly connected to each other. Of course, in other embodiments, the air duct portion 10 and the hand-held portion 30 may be pivotally connected to each other and may be rotatable relative to each other.

In an embodiment, the third housing 32 and the first housing 11 are molded into a one-piece and integral structure, and the fourth housing 33 and the second housing 12 are molded into a one-piece and integral structure.

In another embodiment, the third housing 32 is pivoted with the first housing 11, the fourth housing 33 is pivoted with the second housing 12, and a pivot axis of the third housing 32 and the first housing 11 is coaxial with a pivot axis of the fourth housing 33 and the second housing 12.

According to the present disclosure, for the fan of the above embodiment, the drive portion 22, which is drivingly connected to the rotating blades 21, includes the stator 221 and the rotor 222 sleeving the outside of the stator 221. The rotor 222 is fixedly arranged on the rotating blades 21 and is coaxially arranged with the rotating blades 21. In addition, the stator 221 fixedly sleeves the positioning post 122, such that the power generated by the drive portion 22 of the present embodiment may be transmitted to the rotating blades 21 directly through the rotor 222, without arranging any transmission element between the drive portion 22 and the rotating blades 21, effectively increasing the transmission efficiency of the driving force of the fan provided by the present embodiment.

Embodiment of FIG. 36 to FIG. 42 provide a portable fan.

Specifically, the portable fan includes an air feeding portion 100. As shown in FIG. 36 to FIG. 38, the air feeding portion 100 includes a housing 1 defining a receiving chamber; an air feeding assembly 2 received in the receiving chamber of the housing 1; a display 3 disposed at a front of the housing 1; an air outlet disposed along an outer periphery of the display 3; and an air inlet disposed at a rear of the housing 1. The display 3 is configured to display an operation state. To be noted that, in the present embodiment, the front refers to an end near the user when the fan is in use, and the rear refers to an end away from the user when the fan is in use. An inside refers to a region approaching a central axis of the housing 1, and an outside refers to a region away from the central axis of the housing 1. A top refers to a direction from the hand-held portion 200 towards the air feeding portion 100. When the fan is in use, the display 3 is configured to display a remaining power of the fan, a current wind speed, and a battery power when the fan is being charged.

As shown in FIG. 39, the display 3 is disposed in correspondence with a central axis of the receiving chamber. At least a portion of the display 3 is curved having a concave surface recessed from the front of the housing 1 towards the rear of the housing 1. In the present embodiment, the display 3 is recessed axially along the central axis towards the rear of the housing 1, such that a front side of the display 3 has a concave surface. Since the front side of the display 3 is concave towards the rear of the housing 1, an airflow flowing out from the air outlet is gathered in a region corresponding to the display 3, such that the airflow blown out of the portable fan is optimally gathered, improving an air blowing effect, improving the user experience, saving energies, and increasing a battery endurance time of the portable fan. As shown in FIG. 38, in some embodiments, a plane formed by an edge of the display 3 is lower than a plane formed by a front edge of the housing 1. That is, the plane formed by the display 3 is closer to the air inlet with respect to the plane formed by the front edge of the housing 1. In this way, the display 3 is arranged inside the receiving chamber of the housing 1, and the display 3 is protected from being worn or being damaged by any force.

As shown in FIG. 37 to FIG. 40, the housing 1 includes an inner housing 11 and an outer housing 12 disposed outside the inner housing 11. The inner housing 11 includes a first inner housing 111 and a second inner housing 112 that are disposed sequentially from the front to the rear of the housing. A connection seat 4, in which the display 3 is mounted, is arranged at a region of the receiving chamber corresponding to a rear of the display 3. A plurality of reinforcement plates 41 are disposed between an outer periphery of the connection seat 4 and an inner wall of the first inner housing 111. The plurality of reinforcement plates 41 are uniformly distributed along the outer periphery of the connection seat 4 to divide the air outlet into a plurality of air sub-outlets uniformly distributed along a circumference of the display 3. In some embodiments, a cross section of each air sub-outlet taken along a radial direction of the housing 12 is trapezoidal and arc. The reinforcement plates 41 enables the connection seat 4 to be connected to the inner wall of the first inner housing 111 and provides support for the first inner housing 111, increasing strength of the first inner housing 111. Each of the outer wall of the inner housing 11 and the inner wall of the outer housing 12 is arranged with a mating member, and the mating member of the inner housing 11 and the mating member of the outer housing 12 may be connected to each other. In some embodiments, the mating member includes: a connection groove defined in the outer wall of the inner housing 11 along the axial direction; and a connection projection arranged on the inner wall of the outer housing 12 and correspondingly connected with the connection groove. The connection groove and the connection projection are mated with each other to guide the inner housing 11 and outer housing 12 to be connected with each other, and furthermore, prevent relative rotation between the inner housing 11 and the outer housing 12 to improve stability of the connection between the inner housing 11 and outer housing 12.

The display 3 and the connection seat 4 are connected to each other by a first snap assembly. The first snap assembly includes: a plurality of first snaps 31 disposed along a circumferential direction of a rear side of the display 3; and a plurality of first blocks 42 disposed at a front side of the connection seat 4 and mated with the first snaps 31. Further, each first snap extend from the rear side of the display in a direction towards the air inlet, and an outside of a rear end of the first snap 31 is an inclined surface. The inclined surface reduces a resistance when the first snap 31 is connected with the first block 42, reducing difficulty of assembling, improving a mounting efficiency, providing a cushion, preventing any damage at a corner area when the first snap 31 is connected with the first block 42, and facilitating a mold to be released during a manufacturing process. In other embodiments, the first snap assembly includes: the first blocks 42 disposed at the rear side of the display 3; and the first snaps 31 disposed at the front side of the connection seat and mated with the first blocks 42.

As shown in FIG. 40, a second snap assembly is disposed at a connection region of the first inner housing 111 and the second inner housing 112. The second snap assembly includes: a second block 113 disposed at a rear end of the first inner housing 111; and a second snap 114 disposed at a front end of the second inner housing 112 and mated with the second block 113. Alternatively, a location at which the second snap 114 is arranged and a location at which the second block 113 is arranged may be interchangeable. For example, in some embodiments, the second snap 114 is disposed at the rear end of the first inner housing 111, and the second block 113 is disposed at the front end of the second inner housing 112.

As shown in FIG. 37 and FIG. 38, the air feeding assembly 2 includes: a drive motor 21 disposed along the center axis of the receiving chamber; a fan rotor 22 disposed on a rotation shaft 211 of the drive motor 21; and fan blades 23 disposed on an outer wall of the fan rotor 22. In overall, the fan rotor 22 is a hollow dome. An end of the fan rotor 22 having a larger inner diameter is disposed near the air outlet. The fan blades 23 have a helical streamlined shape, reducing a resistance against an air flowing from the air inlet to the air outlet, and further ensuring an air outputting effect of the portable fan. At least a part of the fan rotor 22 extends to be connected to the drive motor 21. A rotating bearing 24 sleeves a region of the drive motor 21 corresponding to the fan rotor 22 and is connected to an inner wall of the fan rotor 22. In an embodiment, the fan rotor 22 is connected to the rotation shaft 211 of the drive motor 21 through an adapter therebetween. The fan rotor 22 and the fan blades 23 are configured as a one-piece and integral structure. By arranging the drive motor 21 and the fan rotor 22, a space occupied by the air feeding portion 100 is reduced. The rotating bearing 24 ensures the rotational stability of the fan rotor 22 and further ensures overall operational stability of the portable fan.

A region of the second inner housing 112 corresponding to the fan blades 23 is arranged with a cover 115 that covers an outside the fan blades 23. A rear end of the cover 115 is fluidly connected with the air inlet. An inner diameter of the cover 115 decreases gradually from the front the to a rear end. The air inlet is covered by a rear cover 5. The rear cover 5 defines an opening 51 that allows the airflow to enter the receiving chamber. The air inlet is communicated with the air inlet, such that the airflow enters the air inlet and is subsequently guided by the cover 115 to flow directly towards the fan blades 23 and the fan rotor 22. The fan rotor 22 drives the fan blades 23 to rotate to form a vortex air duct. The air duct formed by the cover 115, the fan blades 23, and the fan rotor 22 cooperatively improves the air guiding effect and the air outputting effect. In an embodiment, the rear cover 5 is arranged with connecting strips that extend in a scattering manner from a central axis of the rear cover 5 towards an edge of the rear cover. A gap of every two connecting strips serve as the opening 51. Further, each connecting strip is arc and protruding backwardly, such that a resistance against the airflow is reduced, and the air intaken effect is ensured. In other embodiments, the rear cover 5 defines a plurality of circular or square or other shaped holes to serve as the opening 51.

Further, as shown in FIGS. 37, 38, and 40, the rear cover 5 is connected to the second inner housing 112 by a fixation ring 116. The rear cover 5 is snapped to a rear end of the fixation ring 116. A front end of the fixation ring 116 is connected to the third snap assembly at the rear end of the second inner housing 112. The third snap assembly includes: a third snap 117 disposed at the front end of the fixation ring 116; and a third snap block 118 disposed at the rear end of the second inner housing 112 and mated with the third snap 117. As shown in FIG. 38, an outer wall of the third snap 117 has a cutout surface to facilitate engagement of the third snap 117 with the third block 118 to improve an assembling efficiency. In other embodiments, the third snap assembly includes: the third snap block 118 disposed at the front end of the fixation ring 116; and the third snap 117 disposed at the rear end of the second inner housing 112 and mated with the third snap block 118.

The portable fan further includes a power supply, and the power supply is electrically connected to the display 3 and the drive motor 21.

Another embodiment of the present disclosure provides a portable fan including the air feeding portion 100 as described in the above embodiment. As shown in FIG. 41 and FIG. 42, in the present embodiment, the portable fan further includes a hand-held portion 200 connected to the air feeding portion 100. The hand-held part 200 includes: a handle 6, a speed adjusting knob 7 arranged on the handle 6, a charging port 8 arranged on the handle 6, and a switch button 9 arranged on the handle 6. The power supply is arranged inside the handle 6. The handle 6 defines a mounting slot for receiving the power supply. The speed adjusting knob 7, the charging port 8, and the switch button 9 are electrically connected to the power supply. The charging port 8 is configured to charge the power supply. The switch button 9 is configured to control the connection between the drive motor 21 and the power supply, the connection between the display 3 and the power supply, and the connection between the speed adjusting knob 7 and the power supply. The speed adjusting knob 7 is electrically connected to the drive motor 21 to control an output power of the drive motor 21. When the fan is in use, the speed adjusting knob 7 may be rotated to adjust the output power of the drive motor 21. The fan rotor 22, by being driven by the drive motor 21, drives fan blades 23 to rotate at various speeds to drive the airflow to flow at various flow rates from the air inlet to the air outlet, such that the wind speed is adjusted to meet various demands of the user in various situations, improving the user experience. In some embodiments, as shown in FIG. 42, the speed adjusting knob 7 is disposed on a side of the handle 6 facing the user, such that the speed adjusting knob 7 may be operated by the user conveniently. The charging port and the switch button are disposed on a side of the handle 6 away from the user. In some embodiments, the charging port may alternatively be provided with a dustproof cover to prevent dust and water from entering the charging port.

As shown in FIG. 42, a top of the handle 6 extends into the housing 1 of the air feeding portion 100. Specifically, the top of the handle 6 includes a first connecting member 61 that extends into the housing 1 corresponding to the air outlet. A second connecting member 13 corresponding to the first connecting member 61 is arranged at the air outlet. The first connecting member 61 and the second connecting member 13 are connected to each other by a first fastener 14. In other embodiments, in order to further enhance stability of the connection between the hand-held portion 200 and the air feeding portion 100, the handle 6 further includes a first connecting plate 62 that extends into the housing 1 corresponding to the air inlet, and a second connecting plate 15 corresponding to the first connecting plate 62 is arranged at the air inlet. The first connecting plate 62 and the second connecting plate 15 are connected to each other by a second fastener 16. The first connection plate 62 and the first connection member 61 are opposite to each other.

When the fan is in use, the switch button 9 is switched on, the display 3 is lit up to show the operation state of the fan, and the speed adjustment knob 7 is rotated to adjust the wind speed.

Understandably, the portable fan in another embodiment may include the air feeding portion alone. The air feeding portion may be connected to other portable components. For example, when the portable fan is a neck fan, the portable fan includes a curved wearing portion connected to the air feeding portion.

Embodiments of FIG. 43 to FIG. 50 provide another portable fan.

As shown in FIG. 43 and FIG. 44, the portable fan 100 includes: a fan body 20, a control circuit board arranged inside the fan body 20, and a control portion 21 connected to the control circuit board. The control portion 21 is embedded in the fan body 20 and is partially exposed out of the fan body 20. The control portion 21 includes a roller button 211, and the roller button 211 is configured to adjust, by rolling, the amount of air output from the portable fan 100.

In another embodiment, as shown in FIG. 45, FIG. 47, and FIG. 48, the hand-held fan 101 includes: a fan body 1, a handle 2 connected to the fan body 1; a control circuit board inside the handle 2, and a control portion 21 connected to the control circuit board. The control portion 21 is embedded in and partially exposed out of the handle 2. The control portion 21 includes a rolling key 211 and a spring connected to the rolling key. The amount of air output from the hand-held fan 101 may be adjusted by rolling the rolling key 211, and the operation state of the hand-held fan 101 may be adjusted by pressing the rolling key 211.

In an embodiment, as shown in FIG. 43, FIG. 44, and FIG. 50, the control portion 21 further includes a rotation shaft 213 connected to the rolling key 211 and a rolling rotation encoder 214 connected to the rotation shaft 213. The control circuit board is arranged with an airflow adjustment circuit. The airflow adjustment circuit is connected to the rolling rotation encoder 214 to infinitely adjust the amount of air output from the portable fan 100.

In another embodiment, as shown in FIG. 45, FIG. 47, FIG. 48, and FIG. 50, the control portion 21 further includes a bearing 212, the rotation shaft 213 connected to an inner ring of the bearing 212, and the rolling rotation encoder 214 connected to the rotation shaft 213. An outer ring of the bearing 212 is connected to a rolling key 211. The control circuit board is arranged the airflow adjustment circuit. The airflow adjustment circuit is connected to the rolling rotation encoder 214 to infinitely adjust the amount of air output from the hand-held fan 101.

The rolling rotation encoder 214 is mounted on the control circuit board. When the rolling key 211 rolls, the rolling key 211 drives the rotation shaft 213 to rotate around a central axis and, and the rolling rotation encoder 214 outputs digital signals. The digital signals are processed by the control circuit board to infinitely adjust the amount of air output from the portable fan 100 and the hand-held fan 101.

In another embodiment, as shown in FIG. 46 and FIG. 48, the rotation shaft 213 is connected to a spring (not shown). The control circuit board is further arranged with a switch control circuit. The rolling key 211 is connected to the switch control circuit via the spring. In some embodiments, the control circuit board is vertically disposed. A spring is arranged in a contact of the control circuit board and is configured to reset the rolling key 211. When the rolling key 211 is pressed, the switch control circuit is conducted under pressure, and the hand-held fan 101 starts to operate. At this time, the rolling key 211 may infinitely adjust the amount of air output from the hand-held fan 101. When the rolling key 211 infinitely adjusts the amount of air output from the hand-held fan 101, the switch control circuit is disconnected by pressing the rolling key 211, and the hand-held fan 101 stops operating. In this way, safety of the hand-held fan 101 may be improved, energy consumption may be reduced, and loss caused by accidental switching-on or accidental touching may be reduced.

In another embodiment, as shown in FIG. 48, the bearing 212 includes a body portion 2121 and two annular portions 2122 respectively disposed on two opposite sides of the body portion 2121. A receiving cavity is defined between the two annular portions 2122 to receive the rolling key 211. In some embodiments, the rolling key 211 is a tire-shaped component including two parallel circular end surfaces and a ring-shaped circumferential surface. One of the two end surfaces is disposed at a front of the rolling key 211, and the other one of the two end surfaces is disposed at a rear of the rolling key 211. The ring-shaped circumferential surface connects peripheries of the two circular end surfaces with each other. The ring-shaped circumferential surface defines a plurality of arc grooves along a circumferential direction. The arc grooves enable the user to scroll the rolling key 211 easily to improve the user experience. In some embodiments, a diameter of the annular portion is slightly larger than a diameter of the rolling key 211, such that the rolling key 211 is protected well, and the service life of the rolling key 211 is extended.

In an embodiment, as shown in FIG. 43 and FIG. 44, a battery compartment 22 is arranged inside the fan body 20. A storage battery 221 is received inside the battery compartment 22. The control circuit board is connected to the storage battery 221. In an embodiment, as shown in FIG. 45 and FIG. 47, the battery compartment 22 is arranged inside the handle 2. The battery is a rechargeable battery to further enhance convenience and mobility of the portable fan 100 and the hand-held fan 101.

In an embodiment, as shown in FIG. 49 and FIG. 50, the rolling rotation encoder 214 includes a first output end 2141 and a second output end 2142. The airflow adjustment circuit includes a first adjustment module 201 and a second adjustment module 202. The first output end 2141 is connected to the first adjustment module 201, the second output end 2142 is connected to the second adjustment module 202. The first adjustment module 201 and the second adjustment module 202 are both connected to a positive electrode of the storage battery 221.

Further, as shown in FIG. 44, FIG. 48, FIG. 49, and FIG. 50, the first adjustment module 201 includes a first capacitor C1, a first resistor R1, and a second resistor R2. The second adjustment module 202 includes a second capacitor C2, a third resistor R3, and a fourth resistor R4. The first output end 2141 of the rolling rotation encoder 214 is connected to an end of the first resistor R1 and an end of the second resistor R2. The other end of the first resistor R1 is connected to an end of the first capacitor C1. The other end of the second resistor R2 is connected to the positive electrode of the storage battery 221. The other end of the first capacitor C1 is grounded. The second output end 2142 of the rolling rotation encoder 214 is connected with an end of the third resistor R3 and an end of the fourth resistor R4. The other end of the third resistor R3 is connected to the positive electrode of the storage battery 221, the other end of the fourth resistor R4 is connected to an end of the second capacitor C2, and the other end of the second capacitor C2 is grounded. A third output end 2143 of the rolling rotation encoder 214 is grounded. By arranging the rolling rotation encoder 214, the rolling key 211 may generate a plurality of different digital signals and may infinitely control the rotation speed of the portable fan 100 based on the different digital signals, and the user experience is improved.

In an embodiment, as shown in FIG. 43 and FIG. 44, the portable fan 100 further includes a switch button 216 disposed on the fan body 20 and exposed out from the fan body 20. The switch button 216 is configured to adjust the operation state of the portable fan 100. When the switch button 216 is pressed, the portable fan 100 starts operating, and at this time, the rolling key 211 may infinitely adjust the amount of air output from the portable fan 100. When the switch button 216 is pressed again, the portable fan 100 stops operating.

In an embodiment, as shown in FIG. 43 and FIG. 44, the control circuit board is further arranged with an operation state adjustment circuit. The switch button 216 is connected to the switch control circuit to adjust, by being pressed, the operation state of the portable fan 100. When the switch button 216 is pressed, the operation state adjustment circuit is conducted, and the portable fan 100 starts operating, and at this moment, the rolling key 211 may be rolling to infinitely adjust the amount of air output from the portable fan 100. When the rolling key 211 infinitely adjusts the amount of air output from the portable fan 100, the switch button 216 is pressed again, and the operation state adjustment circuit is disconnected, and at this moment, the portable fan 100 stops operating. In this way, the safety of the portable fan 100 may be improved, and power consumption of the fan may be reduced.

In another embodiment, as shown in FIG. 45, FIG. 46, and FIG. 48, the hand-held fan 101 further includes an anti-accidental-touch button 215 disposed on the handle 2. The anti-accidental-touch button 215 is exposed from the handle 2. The anti-accidental-touch button 215 is configured to prevent switching on the hand-held fan 101 by accidental touching. In some embodiments, the anti-accidental-touch button 215 is a pressable switch or a toggle switch. In another embodiment, after toggling the anti-accidental-touch button and pressing the rolling key 211, the hand-held fan 101 starts operating. At this moment, the rolling key 211 may roll to infinitely adjust the amount of air output from the hand-held fan 101. By setting the dual switching based on toggling the anti-accidental-touch button 215 toggling and pressing the rolling key 211, the hand-held fan 101 is prevented from being switched on caused by the rolling key 211 being pressed by other objects, such that the safety of the hand-held fan 101 is further improved, and power consumption of the fan is reduced.

In another embodiment, as shown in FIG. 45, FIG. 46, and FIG. 48, the anti-accidental-touch button 215 is disposed below the fan body 1. The anti-accidental-touch button 215 and the rolling key 211 are disposed on two opposite sides of the handle 2 respectively. In some embodiments, the rolling key 211 and the anti-accidental-touch button 215 are disposed below the fan body 1 and located at an upper-middle of the handle 2, which fits with usage habits optimally, improving the user experience. The anti-accidental-touch button 215 and the rolling key 211 are provided on two opposite sides of the handle 2 respectively. In this way, when the rolling key 211 is pressed by an object, the anti-accidental-touch button 215 may not be accidentally toggled by the object on the same side, such that the hand-held fan 101 may not be accidentally activated.

In an embodiment, as shown in FIGS. 43 and 44, a surface of the fan body 20 defines a second opening 24 to expose the rolling key 211. In another embodiment, as shown in FIGS. 45 and 48, the surface of the handle 2 defines the second opening 24 to expose the rolling key 211, and a mounting plate 241 is embedded in the second opening 24. The rolling key 211 is exposed out of the second opening 24 through the mounting plate 241. In an embodiment, a shape of the mounting plate 241 may match with a shape of the rolling key 211.

In an embodiment, as shown in FIG. 43 and FIG. 44, the surface of the fan body 20 defines a first opening 23 to expose the switch button 216. In another embodiment, as shown in FIG. 45 and FIG. 46, the surface of the handle 2 defines the first opening 23 to expose the anti-accidental-touch key 215. In some embodiments, a shape of the first opening 23 matches with a shape of the anti-accidental-touch key 215. The anti-accidental-touch key 215 is exposed out of the handle 2 through the first opening 23. In some embodiments, a lanyard hole 25 is defined in a bottom of the handle 2, allowing a lanyard or a decorative piece to pass through. In this way, the hand-held fan 101 may be easily taken and placed, and an appearance of the hand-held fan 101 may be improved. In some embodiments, the lanyard hole 25 and the first opening 23 are located on a same side.

Embodiments of FIG. 51 to FIG. 56 provide a hand-held portion.

As shown in FIG. 51, FIG. 53, and FIG. 54, the hand-held fan 100 includes: a fan body 1, a handle 2 connected to the fan body 1. A control circuit board and a control portion 21 connected to the control circuit board are arranged inside the handle 2. The control portion 21 is embedded in and partially exposed out from the handle 2. The control portion 21 includes a rolling key 211 and a spring connected to the rolling key. The rolling key 211 is configured to adjust, by rolling, the amount of air output from the hand-held fan 100 and to adjust, by being pressed, the operation state of the hand-held fan 100.

In an embodiment, as shown in FIG. 51, FIG. 53, and FIG. 54, the control portion 21 further includes a bearing 212, a rotation shaft 213 connected to an inner ring of the bearing 212, and a rolling rotation encoder 214 connected to the rotation shaft 213. An outer ring of the bearing 212 is connected to the rolling key 211. The control board is arranged with an airflow adjustment circuit. The airflow adjustment circuit is connected to the rolling rotation encoder 214 to infinitely adjusts the amount of air output from the hand-held fan 100. The rolling rotation encoder 214 is mounted on the control circuit board. When the rolling key 211 rolls, the rotation shaft 213 is driven to rotate around a central axis, and the rolling rotation encoder 214 outputs digital signals. The digital signals are processed by the control circuit board to infinitely adjust the amount of air output from the hand-held fan 100.

In an embodiment, as shown in FIGS. 52 and 54, the rotation shaft 213 is connected to a spring (not shown). The control circuit board is arranged with a switch control circuit, and the rolling key 211 is connected to the switch control circuit via the spring. In an embodiment, the control circuit board is vertically disposed, and a spring is arranged in a contact of the control circuit board. The spring is configured to reset the rolling key 211. In another embodiment, when the rolling key 211 is pressed, the switch control circuit is conducted, and the hand-held fan 100 starts to operate. At this time, the rolling key 211 may infinitely adjust the amount of air output from the hand-held fan 100. When the rolling key 211 infinitely adjusts, by rolling, the amount of air output from the hand-held fan 100, the switch control circuit is disconnected by pressing the rolling key 211, and the hand-held fan 101 stops operating. In this way, safety of the hand-held fan 100 may be improved, energy consumption may be reduced, and loss caused by accidental switching-on or accidental touching may be reduced.

In an embodiment, as shown in FIG. 54, the bearing 212 includes a body portion 2121 and two annular portions 2122 respectively disposed on two opposite sides of the body portion 2121. A receiving cavity is defined between the two annular portions 2122 to receive the rolling key 211. In some embodiments, the rolling key 211 is a tire-shaped component including two parallel circular end surfaces and a ring-shaped circumferential surface. One of the two end surfaces is disposed at a front of the rolling key 211, and the other one of the two end surfaces is disposed at a rear of the rolling key 211. The ring-shaped circumferential surface connects peripheries of the two circular end surfaces with each other. The ring-shaped circumferential surface defines a plurality of arc grooves along a circumferential direction. The arc grooves enable the user to scroll the rolling key 211 easily to improve the user experience. In some embodiments, a diameter of the annular portion is slightly larger than a diameter of the rolling key 211, such that the rolling key 211 is protected well, and the service life of the rolling key 211 is extended.

In an embodiment, as shown in FIG. 51 and FIG. 53, a battery compartment 22 is arranged inside the handle 2. A storage battery 221 is received inside the battery compartment 22. The control circuit board is connected to the storage battery 221. In an embodiment, the storage battery 221 is a rechargeable battery to further enhance convenience and mobility of the hand-held fan 100.

In an embodiment, as shown in FIG. 51, FIG. 54, and FIG. 55, the rolling rotation encoder 214 includes a first output end 2141 and a second output end 2142. The airflow adjustment circuit includes a first adjustment module 201 and a second adjustment module 202. The first output end 2141 is connected to the first adjustment module 201, the second output end 2142 is connected to the second adjustment module 202. The first adjustment module 201 and the second adjustment module 202 are both connected to a positive electrode of the storage battery 221.

Further, as shown in FIG. 54, FIG. 55, and FIG. 56, the first adjustment module 201 includes a first capacitor C1, a first resistor R1, and a second resistor R2. The second adjustment module 202 includes a second capacitor C2, a third resistor R3, and a fourth resistor R4. The first output end 2141 of the rolling rotation encoder 214 is connected to an end of the first resistor R1 and an end of the second resistor R2. The other end of the first resistor R1 is connected to an end of the first capacitor C1. The other end of the second resistor R2 is connected to the positive electrode of the storage battery 221. The other end of the first capacitor C1 is grounded. The second output end 2142 of the rolling rotation encoder 214 is connected with an end of the third resistor R3 and an end of the fourth resistor R4. The other end of the third resistor R3 is connected to the positive electrode of the storage battery 221, the other end of the fourth resistor R4 is connected to an end of the second capacitor C2, and the other end of the second capacitor C2 is grounded. A third output end 2143 of the rolling rotation encoder 214 is grounded. By arranging the rolling rotation encoder 214, the rolling key 211 may generate a plurality of different digital signals and may infinitely control the rotation speed of the hand-held fan 100 based on the different digital signals, and the user experience is improved.

In another embodiment, as shown in FIG. 51, FIG. 52, and FIG. 54, the hand-held fan 100 further includes an anti-accidental-touch button 215 disposed on the handle 2. The anti-accidental-touch button 215 is exposed from the handle 2. The anti-accidental-touch button 215 is configured to prevent switching on the hand-held fan 100 by accidental touching. In some embodiments, the anti-accidental-touch button 215 is a pressable switch or a toggle switch. In another embodiment, after toggling the anti-accidental-touch button and pressing the rolling key 211, the hand-held fan 100 starts operating. At this moment, the rolling key 211 may roll to infinitely adjust the amount of air output from the hand-held fan 100. By setting the dual switching based on toggling the anti-accidental-touch button 215 toggling and pressing the rolling key 211, the hand-held fan 100 is prevented from being switched on caused by the rolling key 211 being pressed by other objects, such that the safety of the hand-held fan 100 is further improved, and power consumption of the fan is reduced.

In another embodiment, as shown in FIG. 51, FIG. 52, and FIG. 54, the anti-accidental-touch button 215 is disposed below the fan body 1. The anti-accidental-touch button 215 and the rolling key 211 are disposed on two opposite sides of the handle 2 respectively. In some embodiments, the rolling key 211 and the anti-accidental-touch button 215 are disposed below the fan body 1 and located at an upper-middle of the handle 2, which fits with usage habits optimally, improving the user experience. The anti-accidental-touch button 215 and the rolling key 211 are provided on two opposite sides of the handle 2 respectively. In this way, when the rolling key 211 is pressed by an object, the anti-accidental-touch button 215 may not be accidentally toggled by the object on the same side, such that the hand-held fan 100 may not be accidentally activated.

In an embodiment, as shown in FIGS. 51 and 54, a surface of the handle 2 defines a second opening 24 to expose the rolling key 211, and a mounting plate 241 is embedded in the second opening 24. The rolling key 211 is exposed out of the second opening 24 through the mounting plate 241. In an embodiment, a shape of the mounting plate 241 may match with a shape of the rolling key 211.

In another embodiment, as shown in FIG. 51 and FIG. 52, the surface of the handle 2 defines the first opening 23 to expose the anti-accidental-touch key 215. In some embodiments, a shape of the first opening 23 matches with a shape of the anti-accidental-touch key 215. The anti-accidental-touch key 215 is exposed out of the handle 2 through the first opening 23. In some embodiments, a lanyard hole 25 is defined in a bottom of the handle 2, allowing a lanyard or a decorative piece to pass through. In this way, the hand-held fan 100 may be easily taken and placed, and an appearance of the hand-held fan 100 may be improved. In some embodiments, the lanyard hole 25 and the first opening 23 are located on a same side.

Embodiments of FIG. 57-FIG. 65 illustrate a hand-held fan (also referred to a portable fan).

Referring to in FIG. 57-FIG. 65, in order to solve a problem that an oscillation caused by the rotation of fan blades will generate vibration and noise when the motor is rotating at a high speed during the use of the hand-held fan, the present disclosure provides a hand-held fan. Referring to FIG. 57, FIG. 57 is a schematic view of a hand-held fan according to an embodiment of the present disclosure. The hand-held fan includes an air feeding portion 10 and a hand-held portion 20. Referring to FIG. 58, FIG. 58 is an exploded view of the hand-held fan according to an embodiment of the present disclosure. The air feeding portion 10 includes a housing 11, an air inlet cover 12 detachably connected to the housing 11, and a motor 13 disposed in the housing 11; a motor rotor shaft 131 rotatable relative to the motor 13 is disposed in a shaft hole of the motor 13, and fan blades 15 are connected to a top of the motor rotor shaft 131; a vibration absorbing spring 132 is disposed between the motor 13 and the fan blades 15, and the vibration absorbing spring 132 is sleeved on the motor shaft 131.

Further, referring to FIG. 59, FIG. 59 is a schematic view of an air inlet cover according to an embodiment of the present disclosure. The air inlet cover 12 includes an air inlet plate 121, a first side wall 122 connected to the air inlet plate 121 and wound around a predetermined shaft, and a second side wall 123 wound around a periphery of the first side wall 122. Referring to FIG. 60, FIG. 60 is a schematic view of formation of an air duct according to an embodiment of the present disclosure. The air duct 16 is formed between the first side wall 122 and the second side wall 123, and a minimum inner diameter of the second side wall 123 is greater than a maximum outer diameter of the first side wall 122, which not only ensures the width of the air duct between the second side wall 123 and the first side wall 122, thereby safeguarding the air outlet area, but also reduces the wind resistance of the second side wall 123 and properly guides the airflow in the air duct, thereby having a high air outlet efficiency and making the air outlet smoother.

Specifically, in the embodiments of the present disclosure, when a user is using the hand-held fan, the fan blades 15 rotate under the drive of the motor 13, guiding the airflow from the air inlet cover 12 to a space between the first side wall 122 and the second side wall 123 and blowing out from an air outlet. The user may make the airflow blow to a part desired to be cooled down by holding the hand-held fan, so as to achieve rapid cooling and to enhance human comfort.

Further, referring to FIG. 61, FIG. 61 is a schematic view of fan blades according to an embodiment of the present disclosure. The fan blades 15 include a conical cavity 151 and blades 152 disposed on an outer side of the conical cavity 151, each blade 152 being in the shape of a diagonal flow; a diagonal flow duct 153 is formed between adjacent two blades 152, and the diagonal flow duct 153 is configured to guide the airflow from the air inlet cover 12 to the space of the air duct 16 formed between the first side wall 122 and the second side wall 123, which may reduce the airflow hitting an inner wall of the cover, reduce the airflow loss, and improve the efficiency of the air outlet. In the embodiments of the present disclosure, each blade 152 of the hand-held fan may be in the shape of a diagonal flow, which may make the hand-held fan have a larger air volume, less noise, and a more compact structure, such that the hand-held fan is easy to hold and carry.

Further, referring to FIG. 62, FIG. 62 is a bottom view of the air feeding portion according to an embodiment of the present disclosure. The motor 13 is arranged with a motor bearing 14 sleeved on the motor 13, where the motor bearing 14 is disposed in the conical cavity 151, and the motor bearing 14 is configured to ensure the stability of the motor 13 when rotating at a high speed, which in turn ensures the stability of the operation of the hand-held fan.

Further, referring to FIG. 63, FIG. 63 is a schematic view of a motor rotor shaft and fan blades being configured as a one-piece and integral structure, according to an embodiment of the present disclosure. In the embodiments of the present disclosure, the motor rotor shaft 131 is integrally molded with the fan blades 15, and a metal ring 17 is fixed between the motor rotor shaft 131 and the fan blades 15. The metal ring 17 passes through the motor rotor shaft 131 to fix the motor rotor shaft 131 and the fan blades 15. In this way, the structural setting of the fan blades 15 and the motor rotor shaft 131 being integrally molded effectively reduces the occupied space of the air feeding portion 10.

Further, referring to FIG. 64, FIG. 64 is a schematic view of a vibration absorbing spring according to an embodiment of the present disclosure. In the embodiments of the present disclosure, the vibration damping spring 132 is detachably connected to the motor rotating shaft 131, which facilitates that the vibration damping spring 132 can be replaced after being damaged. In addition, due to different vibration damping strengths required at different locations, inner diameters and spacings between adjacent turns at different portions of the vibration damping spring 132 are different.

Specifically, a spring inner diameter 1321 at an end of the vibration damping spring 132 away from the motor 13 is greater than a spring inner diameter 1322 at an end of the vibration damping spring 132 near the motor 13; a spacing 1323 between adjacent turns at the end of the vibration damping spring 132 away from the motor 13 less than a spacing 1324 between adjacent turns at the end of the vibration damping spring 132 near the motor 13.

Further, referring to FIG. 65, FIG. 65 is a schematic view of connection between a hand-held portion and the air feeding portion according to an embodiment of the present disclosure. The air feeding portion 10 is arranged with a first connecting member 18, the hand-held portion 20 is arranged with a second connecting member 21, and the air feeding portion 10 and the hand-held portion 20 are connected through a fixing member 22. The fixing member 22 passing through the first connecting member 18 and the second connecting member 21 to connect the air feeding portion 10 and the hand-held portion 20. Exemplarily, the fixing member 22 may be a screw or another fixing member for connecting the air feeding portion 10 and the hand-held portion 20, which is not limited herein.

The present disclosure provides a hand-held fan, the hand-held fan including an air feeding portion and a hand-held portion; the air feeding portion includes a housing, an air inlet cover detachably connected to the housing, and a motor disposed in the housing; a motor rotor shaft rotatable relative to the motor is disposed in a shaft hole of the motor, and fan blades are connected to a top of the motor rotor shaft; a vibration absorbing spring is disposed between the motor and the fan blades, and the vibration absorbing spring is provided between the motor and the fan blades, and the vibration absorbing spring is sleeved on the motor rotating shaft. The hand-held fan provided by the present disclosure may reduce the vibration and noise generated by the oscillation caused by the rotation of the fan blades when the motor is rotating at a high speed by means of the vibration absorbing spring, so as to increase the overall comfort of the user when using the hand-held fan, bringing about a better user experience.

Embodiments of FIG. 66-FIG. 71 illustrate a hand-held fan.

Referring to FIG. 66, the present embodiments provide a hand-held fan including an air feeding portion 100, a hand-held portion 200, and an air feeding assembly 300, where the hand-held portion 200 is connected to the air feeding portion 100.

Referring to FIG. 67, FIG. 67 is an exploded view of a hand-held fan according to an embodiment of the present disclosure. The air feeding portion 100 includes an air inlet cover 110.

Referring to FIG. 68, FIG. 68 is a perspective view of an air inlet cover 110 of a hand-held fan according to an embodiment of the present disclosure. The air inlet cover 110 includes an air inlet cover body 112 and an air guide portion 111 connected to the air inlet cover body 112 and extending toward the air feeding assembly 300. The air feeding portion 100 defines a first receiving cavity 120.

Referring to FIG. 69 and FIG. 70, FIG. 69 is a cross-sectional view of a hand-held fan along a line A-A, according to an embodiment of the present disclosure, and FIG. 70 is a perspective view of an air feeding assembly 300 of a hand-held fan according to an embodiment of the present disclosure. The air feeding assembly 300 is arranged in the first receiving cavity 120, the first receiving cavity 120 including an air guide cone 320 and air blades 310 disposed on the air guide cone 320. A first gap is defined between the air guide cone 320 and the air guide portion 111.

Specifically, the air inlet cover body 112 may be any component that can be mated with the air guide portion 111 for airflow guiding. For example, the air inlet cover body 112 may be a component for airflow guiding, such as an airflow guide plate or an airflow guide hole, etc. The air inlet cover body 112 may be a substructure for supporting the air guide portion 111 of the air inlet cover 110, which may improve the stability of the overall structure of the air inlet cover 110. Therefore, the structure of the air inlet cover body 112 is not specifically limited herein, and those skilled in the art may set the structure of the air inlet cover body 112 according to specific needs in specific applications.

Specifically, the air feeding assembly 300 may be a fan module, and the air guide cone 320 may be rotated by a motor, such that the air blades 310 disposed on the air guide cone 320 may be rotated along with the air guide cone 320, which in turns enables that the airflow entering the first receiving cavity 120 through the air inlet cover 110 may be guided out of the air feeding portion 100 along with the rotation of the air blades 310.

It is to be understood that the shape of the air guide cone 320 may be a cone or a cone with a partially truncated top. For example, the air guide cone 320 may include a sidewall annularly disposed around a certain axial direction, which has a gradually decreasing or gradually increasing inner diameter from one end to the other end.

Specifically, the air blades 310 may each be a diagonal flow blade, such that air may flow on a surface of the air guide cone 320 along an air duct between adjacent two air blades 310.

Specifically, the hand-held portion 200 may be any structural member for holding the fan, which is not specifically limited herein.

If there is no gap between the air feeding assembly 300 and the air guide portion 111 of the air inlet cover 110 extending toward the air feeding assembly 300, the airflow entering from the air inlet cover 110 may form a flocculent flow, which causes the airflows to impinge on each other, thereby generating a large noise. Therefore, by arranging a gap between the air guide cone 320 with the air blades 310 and the air guide portion 111, the present disclosure may make the flocculent flow generated by the airflow entering from the air inlet cover 110 reduced, which in turn makes the mutual impulsive interference between the airflows become less, thereby reducing the noise generated by the impulsive interference of the airflow.

In some embodiments, as shown in FIG. 69, the distance of the first gap is greater than 1 mm and less than 14 mm.

It is to be understood that by arranging the gap between the air guide cone 320 and the air guide portion 111, the flocculent flow between the air guide cone 320 and the air guide portion 111 can be effectively reduced. If the distance of the gap between the air guide cone 320 and the air guide portion 111 is designed to be too large, it will cause the distance of the air duct to be too long, which may make the time of the process of supplying air from the air inlet cover 110 to the air outlet longer, and thus lead to a lower efficiency of air feeding of the fan. Therefore, the gap distance between the air guide cone 320 and the air guide portion 111 is designed between 1 mm and 14 mm, making it possible to effectively reduce the flocculent flow while ensuring a certain air feeding efficiency, thereby reducing the noise generated by the fan.

In some embodiments, as shown in FIGS. 69 and 70, the air blades 310 are disposed between end surfaces on both ends of the air guide cone 320.

It will be appreciated that the air blades 310 being disposed between the end surfaces on the ends of the air guide cone 320 may prevent an increased noise generated by the fan caused by the flocculent flow between the air guide cone 320 and the air guide portion 111, due to the fact that an obstruction exists between the air guide cone 320 and the air guide portion 111 caused by the air blades 310 protruding out of the end surfaces on the ends of the air guide cone 320.

In some embodiments, as shown in FIG. 68, the air guide portion 111 is a column in shape, an end of the air guide portion 111 is disposed in the first receiving cavity 120, and the first gap exists between an end of the air guide cone 320 near the air inlet cover 110 and the end of the air guide portion 111 near the air guide cone 320.

Specifically, in the present embodiments, the air guide portion 111 may be a cylinder, a triangular prism, or a square or a rectangular body. The air guide portion 111 is designed in different shapes, which may make the airflow entering the first receiving cavity 120 runs along the surface of the air guide portion 111, so as to play a guiding role for the airflow entering the first receiving cavity 120. That is, in specific applications, those skilled in the art can design the specific shape of the air guide portion 111 according to specific needs.

It is to be understood that the length of the air guide portion 111 extending into the first receiving cavity 120 may be determined according to the distance of the first gap, the greater the distance of the first gap, the greater the length of the air guide portion 111 extending into the first receiving cavity 120, and the less the distance of the first gap, the less the length of the air guide portion 111 extending into the first receiving cavity 120.

In some embodiments, as shown in FIGS. 67 and 69, an end surface on the end of the air guide cone 320 near the air inlet cover 110 is circular, and the diameter of the end surface on the end of the air guide cone 320 near the air inlet cover 110 is less than the diameter of an outer circle on the end surface of the air guide portion 111.

It is to be understood that designing the end surface on the end of the air guide cone 320 near the air inlet cover 110 as a circle is effective to enhance the structural stability of the air guide cone 320 as compared to designing the end of the air guide cone 320 near the air inlet cover 110 as a vertex.

It is to be understood that the end surface of the air guide portion 111 may be square, triangular, or circular, which is not specifically limited herein.

In some embodiments, an axis of the air guide cone 320 may coincide with an axis of the air guide portion 111, such that when the diameter of the outer circle on the end surface of the air guide portion 111 is greater than the diameter of the end surface on the end of the air guide cone 320 near the air inlet cover 110, the airflow along the surface of the air guide portion 111 may not be blocked by the end surface on the end of the air guide cone 320 near the air inlet cover 110 during running to the air duct formed by the air guide cone 320 and the air blades 310, thereby allowing any airflow directed through the air guide portion 111 to be introduced into the air duct, and thus improving the air output efficiency of the fan.

In some embodiments, referring to FIG. 71, FIG. 71 is a perspective view of the air feeding assembly 300 of a hand-held fan according to an embodiment of the present disclosure at another viewing angle. The air feeding assembly 300 further includes a rotation shaft 330 disposed in an inner cavity of the air guide cone 320, the rotation shaft 330 being configured to drive the air guide cone 320 to rotate around a predetermined axial direction, where the predetermined axial direction is an air feeding direction of the air feeding portion 100.

Specifically, the air guide cone 320 may be arranged as a hollow structure to define the inner cavity. Setting the rotation shaft 330 in the inner cavity of the air guide cone 320 may both effectively utilize space and avoid a flocculent flow being formed due to the rotation shaft 330 being arranged outside the air guide cone 320.

In some embodiments, as shown in FIGS. 69 and 71, the air feeding assembly 300 further includes a plurality of support plates 340 connected between an inner wall of the air guide cone 320 and the rotation shaft 330.

It will be appreciated that arranging the support plates 340 between the inner wall of the air guide cone 320 and the rotation shaft 330 allows for a more stable and stronger connection between the air guide cone 320 and the rotation shaft 330.

In some embodiments, further to increase the stability of the connection between the air guide cone 320 and the rotation shaft 330, the support plates 340 may be distributed around a periphery of the rotation shaft 330. Further, the support plates 340 may be uniformly distributed around the periphery of the rotation shaft 330, for further increasing the stability of the connection between the air guide cone 320 and the rotation shaft 330.

In some embodiments, as shown in FIGS. 69 and 71, the air feeding assembly 300 further includes a sleeve 350 sleeved on the periphery of the rotation shaft 330, the support plates 340 being connected to the rotation shaft 330 through the sleeve 350.

In some embodiments, an end of the sleeve 350 may be connected to the end of the air guide cone 320 connected to the rotation shaft 330. Since the rotation shaft 330 is required to drive the air guide cone 320 to rotate, by connecting the sleeve 350 between the support plates 340 and the rotation shaft 330, the sleeve 350 may have a damping effect on the support plates 340, which in turn may ensure the stability of the connection between the support plates 340 and the air guide cone 320.

In some embodiments, as shown in FIGS. 69 and 71, the rotation shaft 330, the sleeve 350, and the air guide cone 320 are integrally molded.

It will be appreciated that the sleeve 350 being integrally molded with the rotation shaft 330 may ensure the stability of the connection between the sleeve 350 and the rotation shaft 330.

Specifically, the end (a first end) of the air guide cone 320 near the air inlet cover 110 may be closed, and an end of the rotation shaft 330 may be integrally molded with the first end of the air guide cone 320, thereby increasing the stability of the connection between the air guide cone 320 and the rotation shaft 330.

In some embodiments, as shown in FIGS. 67 and 69, the diameter of the outer circle on the end surface of the air guide portion 111 is greater than 5 mm and less than 12 mm.

The end surface on the end of the air guide cone 320 near the air inlet cover 110 is a round in shape, and the diameter of the end surface on the end of the air guide cone 320 near the air inlet cover 110 is greater than 1 mm and less than 7 mm.

It will be appreciated that, by setting the diameter of the outer circle on the end surface of the air guide portion 111 to be greater and the diameter of the end surface on the end of the air guide cone 320 near the air inlet cover 110 to be less, the airflow along the surface of the air guide portion 111 may not be blocked or may be less blocked by the end surface on the end of the air guide cone 320 near the air inlet cover 110 during running to the air duct formed by the air guide cone 320 and the air blades 310, thereby allowing as much airflow guided through the air guide portion 111 as possible to be introduced into the air duct, and thus increasing the air output efficiency of the fan.

In addition, setting the diameter of the outer circle on the end surface of the air guide portion 111 to be greater allows the air guide portion 111 to act as a support structure of the air inlet cover body 112 for making the air inlet cover body 112 more stable; and setting the diameter of the end surface on the end of the air guide cone 320 near the air inlet cover 110 to be less allows the air guide cone 320 to have a smaller volume for making the air guide cone 320 take up less area in the first receiving cavity 120, such that the volume of the air duct formed within the air feeding portion 100 may be greater, thereby making it possible for more airflow to be sent out through the air feeding portion 100, and thus increasing the air output efficiency of the fan.

In some embodiments, the diameter of the outer circle on the end surface of the air guide portion 111 may be 8 mm, and the diameter of the end surface on the end of the air guide cone 320 near the air inlet cover 110 may be 4 mm, which allows the diameter of the outer circle on the end surface of the air guide portion 111 to be greater than the diameter of the end surface on the end of the air guide cone 320 near the air inlet cover 110, such that the airflow along the surface of the air guide portion 111 may not be blocked by the end surface on the end of the air guide cone 320 near the air inlet cover 110 during running to the air duct formed by the air guide cone 320 and the air blades 310, and any airflow guided through the air guide portion 111 can be introduced into the air duct, thereby improving the air output efficiency of the fan.

In some embodiments, as shown in FIG. 69, the air feeding assembly 300 further includes a sleeving ring 360 sleeved around the periphery of the rotation shaft 330, and the sleeving ring 360 is sleeved between the rotation shaft 330 and the sleeve 350.

It is to be understood that the sleeving ring 360 sleeved between the rotation shaft 330 and the sleeve 350 may make the sleeving between the rotation shaft 330 and the sleeve 350 more solid with no slipping off occurring, and further increase the strength of the rotation shaft 330.

In some embodiments, as shown in FIG. 69, the sleeving ring 360 is integrally molded with the rotation shaft 330.

It will be appreciated that the sleeving ring 360 being integrally molded with the rotation shaft 330 may increase the stability of the sleeving between the sleeving ring 360 and the rotation shaft 330, and may further increase the strength of the rotation shaft 330.

Embodiments of FIG. 72-FIG. 78 illustrate a hand-held fan.

Referring to FIG. 72-FIG. 78, to solve a problem that a noise will be generated due to a vibration of an impeller when the impeller rotates during the use of the hand-held fan, the present embodiments provide a hand-held fan. Referring to FIG. 72, FIG. 72 is a schematic view of a hand-held fan according to an embodiment of the present disclosure, where the hand-held fan includes an air feeding portion 10 and a hand-held portion 20. Referring to FIG. 73, FIG. 73 is an exploded schematic view of the hand-held fan according to an embodiment of the present disclosure, where the air feeding portion 10 includes an outer housing 11 and an inner housing 12 that are detachably assembled. The outer housing 11 defines a first receiving cavity 111 suitable for accommodating the inner housing 12, the inner housing 12 defines a second receiving cavity 121 suitable for hold an air feeding assembly 30, and a vibration absorbing structure 40 is arranged between the outer housing 11 and inner housing 12.

Specifically, the outer housing 11 and the inner housing 12 can be disassembled and assembled. The inner housing 12 is disposed in the first receiving cavity 111 of the outer housing 11, and the air feeding assembly 30 is disposed in the second receiving cavity 121 of the inner housing 12. When the hand-held fan is being used, the rotation of the air feeding assembly 30 will cause a vibration of the inner housing 11, and the vibration absorbing structure 40 between the outer housing 11 and the inner housing 12 may effectively reduce the vibration transmitted from the inner housing 12 to the outer housing 11 when the air feeding assembly 30 is rotating, thereby reducing the noise generated by the hand-held fan when in use.

Further, the vibration absorbing structure 40 is snap-fitted to an inner side of the outer housing 11, and the vibration absorbing structure 40 is arranged along a periphery 122 of the inner housing 12. In the present embodiments, the outer housing 11 is detachably connected to the inner housing 12, the vibration absorbing structure 40 is snap-fitted to the inner side of the outer housing 11, and the vibration absorbing structure 40 and the inner side of the outer housing 11 may abut against each other, thereby counteracting the vibration generated in the inner housing 11. Further, the vibration damping structure 40 is snap-fitted to the inner side of the outer housing 11, which is relatively simple to disassemble and facilitates the timely cleaning of parts such as the outer housing 11, the inner housing 12, and an air inlet cover 50.

Further, the vibration absorbing structure 40 is integrally molded with the inner housing 12, which may effectively reduce the vibration of the air feeding assembly 30 transmitted from the inner housing 12 to the outer housing 11 when the air feeding assembly 30 is rotating, and make the structure of the hand-held fan more concise and compact, thereby simplifying the overall assembly process of the hand-held fan and effectively improving the production efficiency of the hand-held fan.

Further, referring to FIG. 74, FIG. 74 is a schematic view of an air feeding portion according to an embodiment of the present disclosure. The vibration absorbing structure 40 may be specifically implemented as at least two trapezoidal protrusions. The trapezoidal protrusions are spaced at equal intervals, and the number of the trapezoidal protrusions is at least two, which are specifically set correspondingly according to the diameters of the outer housing 11 and the inner housing 12. The embodiments of the present disclosure do not make any limitation in this regard.

Specifically, in the embodiments, the vibration damping structure 40 are trapezoidal protrusions, where a wider cross-section side of each trapezoidal protrusion faces the outer housing 11, and a narrower cross-section side of the trapezoidal protrusion faces the inner housing 12. The trapezoidal protrusions may abut against the inner side of the outer housing 11, so as to effectively buffer vibration conducted by the inner housing 12 to the air feeding assembly 30 when the air feeding assembly 30 is rotating, thereby achieving a vibration damping effect.

Further, the trapezoidal protrusion may be hollow, and an end of the trapezoidal protrusion snap-fitted to the outer housing 11 defines a through hole 41 to facilitate ventilation. In the embodiments of the present disclosure, the trapezoidal protrusion is arranged to be hollow, which may reduce the weight of the trapezoidal protrusion, making the hand-held fan more lightweight, and allow some elastic deformation of the outer housing 11 when rotating relative to the inner housing 12, thereby enhancing the stability of the connection between the outer housing 11 and the inner housing 12. In the embodiments of the present disclosure, the trapezoidal protrusion defines the through hole 41 at the end of the trapezoidal protrusion snap-fitted to the outer housing 11, such that the trapezoidal protrusion will not block the through hole 41 while damping vibration.

Further, referring to FIG. 75, FIG. 75 is a cross-sectional view of a hand-held fan according to an embodiment of the present disclosure. The air feeding portion 10 further includes the air inlet cover 50 snap-fitted to the inner housing 12. The air inlet cover 50 including an air inlet plate 501 and a fixing ring 502 snap-fitted to a periphery of the air inlet plate 501, and an air duct is formed between the air inlet plate 501 and the air feeding assembly 30 and is disposed within the second receiving cavity 121.

Specifically, the air feeding assembly 30 is disposed in the second receiving cavity 121, and the air feeding assembly, when in operation, can direct the airflow from the air inlet plate 501 out of the second receiving cavity 121, thereby forming an air duct, which makes the airflow out of the hand-held fan more uniform and improves the efficiency of the air outlet of the hand-held fan.

Further, referring to FIG. 76, FIG. 76 is a schematic view of an air feeding assembly according to an embodiment of the present disclosure. The air feeding assembly 30 includes a drive motor 31 and an impeller assembly 32. The impeller assembly 32 includes a conical cavity 321 and blades 322 distributed around an outer side of the conical cavity 321. A motor bearing 311 is arranged in the conical cavity 321, the motor bearing 311 being sleeved on an outer side of the drive motor 31. The arranging of the motor bearing 311 may ensure the stability of the drive motor 31 when it rotates at a high speed, which in turn ensures the overall operational stability of the hand-held fan.

Specifically, in the embodiments of the present disclosure, when the user is using the hand-held fan, the blades 322 rotate under the drive of the drive motor 31, directing the airflow from the air inlet cover 50 to the air duct within the second receiving cavity 121 and blowing out from an air outlet, such that the user make the airflow blow to a part desired to be cooled down by holding the hand-held fan, so as to achieve rapid cooling and to enhance human comfort.

In addition, a maximum outer diameter of the impeller assembly 32 is less than a maximum outer diameter of the air inlet cover 50, which may make most of the impeller assembly 32 covered, thereby enabling a better appearance and preventing pinching of hands and hair, and thus improving the user experience. A maximum outer diameter of the outer housing 11 is equal to the maximum outer diameter of the air inlet cover 50, which may make the size of the air inlet cover 50 and the outer housing 11 match to be mounted stably.

Further, referring to FIG. 77, FIG. 77 is a schematic view of an impeller assembly according to an embodiment of the present disclosure. The blades 322 are each in the shape of a diagonal flow, a diagonal flow duct 323 is formed between adjacent two blades 322, and the diagonal flow duct 323 is configured to guide the airflow from the air inlet cover 50 into to the space of the air duct. Each blade 322 of the hand-held fan may be in the shape of a diagonal flow, which may make the hand-held fan have a larger air volume, less noise, and a more compact structure, such that the hand-held fan is easy to hold and carry.

Further, referring to FIG. 78, FIG. 78 is a schematic view of connection between a hand-held portion and an air feeding portion according to an embodiment of the present disclosure. The hand-held portion 20 is arranged with a first connecting member 21, the air feeding portion 10 is arranged with a second connecting member 13, and the hand-held portion 20 and the air feeding portion 10 are connected through a fixing member 22. The fixing member 22 passing through the first connecting member 21 and the second connecting member 13 to fix the hand-held portion 20 and the air feeding portion 10. Exemplarily, the fixing member 22 may be a screw or another fixing member 22 for connecting the air feeding portion 10 and the hand-held portion 20, which is not limited herein.

The present disclosure provides a hand-held fan, the hand-held fan including an air feeding portion and a hand-held portion; the air feeding portion including an outer housing and an inner housing that are detachably connected, the outer housing defining a first receiving cavity suitable for accommodating the inner housing, the inner housing defining a second receiving cavity suitable for installing an air feeding assembly; a vibration absorbing structure is arranged between the outer housing and the inner housing. For the hand-held fan provided by the present disclosure, by arranging the vibration absorbing structure between the outer housing and the inner housing, the noise generated by the vibration of the impeller transmitted to the outer housing when the hand-held fan is in use may be effectively reduced, thereby increasing the overall usage comfort of the hand-held fan and bringing about a better user experience when the user uses the hand-held fan.

Embodiments of FIG. 79-FIG. 85 illustrate a motor drive control circuit for a portable fan.

Referring to FIG. 79, a motor drive control circuit for a portable fan includes: a battery power supply, a voltage regulator unit 100, a master control unit 200, a motor drive control unit 300, a motor drive circuit 400, a motor 500, a rotor position detection circuit 600, a USB access circuit 700, an analog-to-digital converter (ADC) power supply circuit 800, and a display unit 900.

The portable fan includes: a hand-held fan, a neck fan, a wearable fan, a waist-mounted fan, a head-mounted fan, a desktop fan, a vehicle-mounted fan, etc.

Referring to FIG. 80, the voltage regulator unit 100 includes a voltage regulator chip U1, and a power supply voltage VBAT is connected to an IN input pin of the voltage regulator chip U1 through a current limiting resistor R1; an end of a filtering capacitor C1 is connected to the IN input pin 1 of the voltage regulator chip U1, and the other end of the filtering capacitor C1 is grounded; an OUT output pin of the voltage regulator chip U1 is configured to output a VDD operating voltage, for supplying power to a master control chip U2 and a motor driver chip U3; the OUT output pin of the voltage regulator chip U1 is grounded through a capacitor C2 to filter current; a GND pin of the voltage regulator chip U1 is grounded.

The voltage regulator unit 100 is configured to stabilize the power supply voltage and ensure that a constant voltage is output under different load conditions, where the output voltage may be kept constant by automatically adjusting the current according to changes in the power supply voltage. The voltage regulator unit 100 is configured to stabilize a voltage source with large variations to prevent influences of external environmental factors (e.g., temperature, humidity, etc.) on the circuit.

Referring to FIG. 81, in some embodiments, the motor drive control unit 300, the motor drive circuit 400, and the rotor position detection circuit 600 operate in concert to drive the operation of the motor 500.

A permanent magnet is arranged on a rotor of the motor 500, and three windings U2, V2, and W2 are arranged on a stator of the motor 500 in the form of a Y-type connection.

The motor drive control unit 300 is configured to output a control signal, and the motor drive circuit 400 is configured to control the magnitude, flow direction, and phase relationship of a current flowing through each phase of the windings U2, V2, and W2 of the motor 500 according to a control signal.

The motor drive circuit 400 includes: capacitors C3, C4, and C5 connected in parallel, with an end being connected to the power supply voltage VBAT, and the other end being grounded to filter the current and stabilize the voltage.

In some embodiments, the motor drive circuit 400 further includes: a MOS tube switch Q1, with an end being connected to the power supply voltage VBAT, and the other end being connected to the winding U2. The turning-on of the MOS tube switch Q1 is controlled by a MOS tube switch Q4, with an end of the MOS tube switch Q4 being connected to the power supply voltage VBAT through a voltage divider current limiting resistor R5, and the other end of the MOS tube switch Q4 being grounded. The motor drive control unit 300 is configured to output a PWM AH signal to a drain of the MOS tube switch Q4 to control the turning-on of the MOS tube switch Q4. An end of a MOS tube switch Q7 is connected to the winding U2, and the other end of the MOS tube switch Q7 is grounded through a resistor R11. The motor driver control unit 300 is configured to output a PWM_AL signal to a drain of MOS tube switch Q7 to control the turning-on of the MOS tube switch Q7. A reverse diode is arranged on each of the MOS tube switches Q1, Q4, and Q7 to prevent the MOS tubes from being burned out by the diodes being broken down in reverse before the overvoltage causes damage to the MOS tubes.

In some embodiments, the MOS tube switch Q1 is a P-type MOS tube, and the MOS tube switches Q4 and Q7 are N-type MOS tubes. A resistor R2 is connected to the drain and source of the MOS tube switch Q4, and a resistor R8 is connected to the drain and source of MOS tube switch Q7 to provide a bias voltage for the field effect tubes. Further, an electrostatic charge between the gate and source of the MOS tubes may be discharged to protect the MOS tubes.

The current control principle of the winding U2 is as follows.

The current flowing into the winding U2: the motor drive control unit 300 outputs a PWM_AL low-level signal to the drain of the MOS tube switch Q7, and the MOS tube switch Q7 is in a turned-off state; the motor drive control unit 300 outputs a PWM_AH signal to the drain of the MOS tube switch Q4, and the MOS tube switch Q4 is in a turned-on state; the power supply voltage VBAT is grounded through the voltage divider current limiting resistor R5; the drain of the MOS tube switch Q1 is grounded to input a low-level signal, and the MOS tube switch Q1 is in a turned-on state; the current flows into the winding U2.

The current flowing out of the winding U2: the motor drive control unit 300 outputs a PWM_AH low-level signal to drain of the MOS tube switch Q4, the MOS tube switch Q4 is in a turned-off state; the drain of the MOS tube switch Q1 is connected to a high-level signal, and the MOS tube switch Q1 is turned off; the motor drive control unit 300 outputs a PWM_AL signal to the drain of the MOS tube switch Q7, the MOS tube switch Q7 is turned on, and the current flows out of the winding U2.

In some embodiments, for a MOS tube switch circuit formed by MOS tube switches Q2, Q5, Q8 and resistors R6, R3, R9 for controlling the current to flowing into and out of the winding V2, its circuit structure and control principle are similar to that of the current control circuit of the winding U2; for a MOS tube switch circuit formed by MOS tube switches Q3, Q6, Q9 and resistors R7, R4, R10 for controlling the current to flowing into and out of the winding W2, its circuit structure and control principle are similar to that of the current control circuit of the winding U2.

In some embodiments, a motor overcurrent protection circuit includes: a current sampling resistor R11 for monitoring the current flowing out of the motor 500; the voltage of the resistor R11 is configured to be output to an ISENSE_IN overcurrent protection detection pin of the motor drive control unit 300 through a current limiting resistor R12, and the motor drive control unit 300 is configured to convert the input voltage signal into a corresponding digital signal to obtain a quantized current value of the motor 500; an end of a capacitor C6 is connected to the ISENSE_IN overcurrent protection detection pin of the motor drive control unit 300, and the other end of the capacitor C6 is grounded to filter the current and stabilize the voltage; when the current value of the motor 500 exceeds a maximum operating current, the motor drive control unit 300 adjusts a control signal outputted to the motor drive circuit 400 to reduce the current flowing through the windings U2, V2, and W2 of the motor 500.

Referring to FIG. 82, in some embodiments, in the rotor position detection circuit 600, an end of a resistor R13 is connected to a BEMF_COM pin of the motor drive control unit 300, and the other end of the resistor R13 is grounded through a resistor R19; the winding U2 is connected to a BEMF_U pin of the motor drive control unit 300 through a resistor R14, and the other end of the resistor R14 is grounded through the resistor R19.

For a BEMF counter-electromotive force output circuit formed by resistors R15, R16, R20 for outputting a BEMF counter-electromotive force voltage signal of the winding V2, its circuit structure and control principle is similar to that of the BEMF counter-electromotive force output circuit of the winding U2. For a BEMF counter-electromotive force output circuit formed by resistors R17, R18, R21 for outputting a BEMF counter-electromotive force voltage signal of the winding W2, its circuit structure and control principle is similar to that of the BEMF counter-electromotive force output circuit of the winding U2.

The motor drive control unit 300 is configured to monitor line voltages of the windings U2, V2, and W2 by means of signals inputted through the BEMF_U, BEMF_V, and BEMF_W pins, and calculate the counter-electromotive force of the rotor of the motor 500, thereby calculating and obtaining the position of the rotor of the motor 500.

The driving control principle of the motor 500 is as follows.

The master control unit 200 outputs a motor start signal to an input end of the motor drive control unit 300, and the motor drive control unit 300 outputs a motor drive signal to the gate of the MOS tube of the motor drive circuit 400; the motor drive control unit 300 obtains the current position of the rotor of the motor 500 by means of the counter-electromotive force, controls the phase relationship of the outputs of each phase, and energizes corresponding two-phase windings each time, with the energizing time of each phase of the windings being a 120-degree electrical angle, so as to make the direction of the stator magnetic chain at an angle to the direction of the rotor magnetic chain, thereby driving the rotation of the rotor of the motor 500.

Referring to FIG. 83, in some embodiments, the motor drive control unit 300 includes a motor drive chip U3, where a VDD power supply pin 12 of the motor drive chip U3 is connected to the VDD operating voltage, and a capacitor C7 is connected to the VDD power supply pin 12 of the motor drive chip U3 to filter the current and stabilize the voltage; a GND pin 5 of the motor drive chip U3 is grounded; a PWM pin 11 of the motor drive chip U3 is configured to receive a motor operation pulse modulation signal PWM, and pins 1-3 and 14-16 of the motor driver chip U3 are each configured to output a motor drive signal to the gate of the MOS tube of motor driver circuit 400; pins 6-8 of the motor driver chip U3 is configured to receive reverse electromotive force signals BEMF_U, BEMF_V, and BEMF_W; a FG pin 13 of the motor driver chip U3 is configured to output motor rotation speed information; an ISENSE_IN pin 9 of the motor driver chip U3 is configured to receive an overcurrent protection signal.

Referring to FIG. 84, in some embodiments, the USB access circuit 700 includes: a USB voltage VBUS for outputting a USBDET signal through a current limiting resistor R22; and a diode D2, with a positive end being grounded and a negative end being connected to the USB voltage VBUS through the resistor R22, to realize over-voltage protection of the master control unit.

In some embodiments, the battery voltage detection ADC circuit 800 includes: a battery voltage VBAT grounded through resistors R23 and R24, and a capacitor C8 connected in parallel with the resistor R24; an end of the resistor R24 is configured to output an ADC voltage signal V_ADC.

In some embodiments, the motor drive control circuit of the portable fan is arranged with a transfer interface P2; the transfer interface P2 is configured to transmit a P_EN enable signal and gear adjustment signals KEY, KEY_X, KEY_Y of a dip switch to the master control unit 200 of the portable fan, and the VDD power supply is connected to a mode switching roller through current limiting resistors R25, R26.

As shown in FIG. 85, in some embodiments, the display unit 900 includes: an SMG switch interface and a digital display; adapter interface pins 1-5 of the SMG switch are connected to the master control unit 200 through current limiting resistors R25-R29, for receiving a display control signal and transmitted it to the digital display; the digital display is configured to display an air feeding temperature and remaining power percentage of the portable fan according to the display control signal.

In some embodiments, the master control unit 200 includes a control chip U4, a VDD power supply pin 1 of the control chip U4 is connected to the VDD operating voltage, the VDD power supply pin 1 of the control chip U4 is grounded through a voltage regulator capacitor C9; a VSS pin 16 of the control chip U4 is grounded; pins 4, 6, and 7 of the control chip U4 is configured to receive gear adjustment signals KEY, KEY_X, KEY_Y and send a fan operation status command; a pin 5 of the control chip U4 is configured to output a motor operation pulse modulation PWM signal to the motor driver chip U3; a pin 8 of the control chip U4 is configured to receive a USBDET signal to determine a power supply status; a pin 9 of the control chip U4 is configured to receive an ADC voltage signal V_ADC; pins 2, 12-15 of the control chip U4 are connected to the display unit 900 to output the display control signal.

Embodiments of FIG. 86-FIG. 88 illustrate a charging management circuit for a portable fan.

Referring to FIG. 86-FIG. 88, a charging management circuit for a portable fan includes at least one of: a fast-charging management unit 300 and a charging management unit 400; the fast-charging management unit 300 includes a fast-charging communication module, a fast-charging control signal output module, a fast-charging voltage setting module, and a fast-charging current setting module; the charging management unit 400 includes a charging communication module, a charging drive module, a charging current detection module, a termination voltage setting module, a charging status output module, and an over-temperature protection module. The charging management circuit of the portable fan having the fast-charging management unit and the charging management unit may switch between a fast-charging mode and an ordinary boost charging mode.

The portable fan includes: a hand-held fan, a neck fan, a desktop fan, a waist-mounted fan, and a head-mounted fan, etc.

The charging management circuit further includes: a charging adapter 100, a USB input unit 210, a USB output unit 220, a control unit 500, a battery pack 600, and a charging display unit 700; the charging adapter 100 is connected to the USB input unit 210; the USB output unit 220 is connected to the fast-charging management unit 300 and the charging management unit 400; the fast-charging management unit 300 and the charging management unit 400 are connected to the control unit 500; the fast-charging control signal output module of the fast-charging management unit 300 is connected to a controlled end of a switching circuit; the charging management unit 400 is connected to the battery pack 600, and the fast-charging management unit 300 and the control unit 500 are connected to the battery pack 600 through the charging management unit 400; the charging display unit 700 is connected to the control unit 500.

The portable fan is configured to supply power to the battery pack 600 through the connection with the charging adapter 100, the USB input unit 210, the USB output unit 220, the fast-charging management unit 300, the charging management unit 400, and the control unit 500; the fast-charging management unit 300 and the charging management unit 400 can communicate with the charging adapter 100 through a USB interface.

The USB output unit 220 includes a USB interface J1, the fast-charging management unit 300 includes a power pickup protocol chip (USB PD Sink) U2, and the charging management unit 400 includes a charging chip U1.

A pin A1B12 and a pin A12B1 of the USB interface J1 are grounded; the fast-charging management unit 300 and the charging management unit 400 are connected to VBUS pins A4B9 and A9B4 of the USB interface J1 for the introduction of an external power supply; a DP data pin A6B6 and a DM data pin A7B7 of the USB interface J1 are connected to the fast-charging management unit 300 and the charging management unit 400 for the fast charging management unit 300 and the charging management unit 400 to recognize the external power supply; where the terms of DP (data plus) and DM (data minus) refer to data signal lines of the USB.

In some embodiments, the power pickup protocol chip U2 is communicatively connected to the USB interface J1 through the data signal lines and a configuration channel of the fast-charging communication module. The fast-charging communication module includes: a DP′ data pin 2 of the power pickup protocol chip U2 being connected to DP data pins A6B6 of the USB interface J1 through a current limiting resistor R1; a DM′ data pin 3 of the power pickup protocol chip U2 being connected to DM data pins A7B7 of the USB interface J1 through a current limiting resistor R2; a CC1 configuration channel first pin 4 being connected to a CC1 configuration channel first pin A5 of the USB interface J1, and a CC2 configuration channel second pin 5 of the power pickup protocol chip U2 being connected to a CC2 configuration channel second pin 5 of the power pickup protocol chip B5 of the USB interface J1; the CC1 configuration channel first pin 4 being grounded through a capacitor C1, and the CC2 configuration channel second pin 5 of the power pickup protocol chip U2 being grounded through a capacitor C2; where the capacitors C1 and C2 are configured to filter the current and stabilize the voltage. The fast-charging communication module of the power pickup protocol chip U2 is connected to the charging adapter 100 through a USB cable to establish a data mode (DM, DP communication) and fast-charging communication mode (Powered Device: PD2.0/3.0, Quick Connect: QC2.0/3.0, Appledivider3, Battery Charge: BC1.2 SDP, Digital Communication Protocol/Charging Downstream Port: DCP/CDP), for applying, recognizing, and monitoring the voltage required to charge the battery pack 600 of the portable fan.

In some embodiments, the fast-charging control signal output module includes: the power pickup protocol chip U2 establishing a fast-charging communication with the charging adapter 100 through the configuration channel pins (pins 4, 5); and outputting a fast-charging drive signal through a fast-charging drive pin 10.

In some embodiments, a VIN chip power supply pin 1 of the power pickup protocol chip U2 is connected to the VBUS through a current limiting resistor R3, and the VIN chip power supply pin 1 of the power pickup protocol chip U2 is grounded through a voltage regulating capacitor C3.

The fast-charging voltage setting module includes: a VSET voltage setting pin 8 of the power pickup protocol chip U2 being grounded through a resistor R4; the power pickup protocol chip U2 is configured to obtain a voltage signal of the resistor R4 to set the charging voltage of the battery pack 600 in the fast-charging mode; the fast-charging charging voltage of the battery pack 600 can be changed by changing the resistance value of R4.

The fast-charging current setting module includes: an ISET current setting pin 9 of the power pickup protocol chip U2 being grounded through a resistor R5; the power pickup protocol chip U2 is configured to obtain a voltage signal of the resistor R5 to set the charging current of the battery pack 600 in the fast-charging mode; the fast-charging charging current of the battery pack 600 can be changed by changing the resistance value of R5.

The fast-charging mode works as follows.

The power pickup protocol chip U2 establishes a PD fast-charging communication with the charging adapter 100 through the CC1 configuration channel first pin 4 and the CC2 configuration channel second pin 5, sets the fast-charging charging voltage through the monitored signal of the VSET voltage setting pin 8, sets the fast-charging charging current through the monitored signal of the ISET current setting pin 9, and outputs the fast-charging drive signal through the GATE pin 10; a charging socket outputs a high voltage for fast-charging the battery pack 600; a fast-charging charging status is transmitted by means of a connection with an I2C (serial bus) bus and the control unit 500 of the portable fan through a serial data line (SDA) pin 6 and a serial clock line (SCL) pin 7.

The VBUS charging input pin 1 of the charging chip U1 is connected to the VBUS; an end of a voltage regulator capacitor C4 is connected to the VBUS charging input pin 1 of the charging chip U1, and the other end of the voltage regulator capacitor C4 is grounded for filtering the current and stabilizing the power supply.

In some embodiments, the charging communication module includes: a DPC data positive signal pin 5 of the charging chip U1 being connected to a USB data positive signal through a current limiting resistor R6, and a DMC data negative signal pin 6 of the charging chip U1 being connected to a USB data negative signal through a current limiting resistor R7. The charging communication module is configured for the charging chip U1 to recognize a state of the external power supply.

In some embodiments, the charging driver module includes: a SW1 inductor first pin 12 and a SW2 inductor second pin 13 of the charging chip U1 being connected to two ends of a variable voltage storage inductor L1, respectively; a BT1 first bootstrap capacitor pin 11 of the charging chip U1 and a BT2 second bootstrap capacitor pin 14 of the charging chip U1 being connected to the two ends of the variable voltage storage inductor L1 through capacitors C5 and C6, respectively, where the capacitors C5 and C6 are bootstrap capacitors to provide boost bias voltage for a boost circuit; the two ends of the variable storage inductor L1 are grounded by current limiting resistors R8 and R9, respectively; a RC circuit is arranged on each of two NCs of the charging chip U1 to be grounded in parallel with a corresponding one of R8 and R9, which may be configured to filter out a high-frequency signal.

A VBAT charging output pin 3 of the charging chip U1 is connected to the battery pack 600; filter capacitors C7, C8, C9, C10, C11 are connected in parallel, with an end being connected to the pin 3 of the charging chip U1, and the other end being grounded; a positive end of a diode D2 is grounded, and a negative end of the diode D2 is connected to the VBAT charging output pin 3 of the charging chip U1; the charging chip U1 is configured to charge the battery pack 600 through the charging drive module in the boost charging mode.

The ordinary charging mode works as follows.

The charging adapter 100 is an ordinary charging adapter, and the charging chip U1 communicates with the charging adapter 100 in handshake through the DPC data positive signal pin 5 and the pin 6, requesting a charging voltage; the charging chip U1 controls an internally integrated MOS tube circuit to charge and store the energy for the inductor L1, and then the charging chip U1 turns on the MOS tube circuit to release the energy of the inductor L1, in which case the inductor L1 is connected in series with the VBUS realizing a boosting effect, and the battery pack 600 is charged through the boost circuit.

The charging chip U1 has a function of raising and lowering the voltage. When the input voltage is lower than the charging voltage, the charging chip U1 may raise the voltage to the charging voltage for charging the battery pack 600; when the input voltage is higher than the charging voltage, the charging chip U1 may lower the voltage to the charging voltage for charging the battery pack 600.

In some embodiments, the charging current detection module includes: a CSP current sampling positive pin 20 of the charging chip U1 and a CSN current sampling negative pin 21 being connected through a sampling resistor R10 for induce a charging current; capacitors C12, C13, C14, and C15 being connected in parallel, with an end being connected to the CSP current sampling positive pin 20 of the charging chip U1, and the other end being grounded for filtering the current and stabilizing the voltage; a CSO induction current monitoring pin 19 of the charging chip U1 being grounded through a resistor R11, where the voltage of the CSO induction current monitoring pin 19 of the charging chip U1 is proportional with the induction charging current. The charging chip U1 is configured to detect the value of the charging current of the battery pack 600 through the charging current detection module.

In some embodiments, the termination voltage setting module includes: a CSE battery termination voltage setting pin 7 of the charging chip U1 being grounded through a resistor R12 and configured to set a battery termination voltage in the charging mode through the resistance value of the resistor R12.

In some embodiments, the over-temperature protection module includes: an NTC thermistor pin 18 of the charging chip U1 being grounded through a resistor R14.

The charging status output module includes: a PG charging status pin 8 of the charging chip U1 being connected to a supply voltage VCC through a pull-up resistor R13, and the charging chip U1 is configured to output a charging status signal through the PG charging status pin 8.

A loop compensation module includes: a COMP loop compensation pin 17 of the charging chip U1 being grounded through a RC circuit formed by a resistor R15 and a capacitor C17, for enhancing the stability and transient response of the circuit.

A VCC chip operating voltage output pin 9 of the charging chip U1 is configured to output an operating voltage, which is grounded through a voltage regulator capacitor C16.

Embodiments of FIG. 89-FIG. 93 illustrate a battery boost charging circuit for a portable fan.

Referring to FIG. 89, a battery boost charging circuit for a portable fan includes: a USB interface, a boost module, a boost charging management module, a charging voltage preset module, a charging status indication module, and an over-temperature protection module.

The portable fan includes: a hand-held fan, a neck fan, a waist-mounted fan, a head-mounted fan, a desktop fan, a vehicle-mounted fan, etc.

The USB interface includes an interface J1, and the boost charging management module includes a charging chip U1.

Referring to FIG. 90, in some embodiments, the boost charging management module has the following features: the charging chip U1 integrates a power MOS tube and a synchronous boost circuit.

The boost module circuit includes: an inductor L1, with an end being connected to a USB voltage VBUS, and the other end being connected to an LX external inductor pin 8 of the charging chip U1; a BST bootstrap capacitor pin 7 of the charging chip U1 being connected to the pin 8 through a bootstrap capacitor C2, where the bootstrap capacitor C2 is configured to raise a DC bias voltage in an amplifier circuit and enhance the amplitude of an output signal; an LX external inductor pin 8 of the charging chip U1 being grounded through a resistor R1 and a capacitor C1, where the resistor R1 and capacitor C1 are connected in series to form an RC circuit configured to filter out a high-frequency signal; an current-limiting resistor R2, with an end being connected to the USB voltage VBUS, and the other end being connected to a VIN power supply input pin 6 of the charging chip U1 to introduce an input voltage, where the VIN power supply input pin 6 of the charging chip U1 is grounded through a capacitor C4 to filter out the current; a regulator capacitor C5, with an end being connected to the USB voltage VBUS, and the other end being grounded. The boost charging circuit is configured to boost-charge a BAT battery through the boost module.

The battery boost charging circuit for a portable fan is further arranged with a voltage regulator filter circuit, including the following. A VOUT boost output pin 2 of the charging chip U1 outputs a charging voltage to charge the BAT battery. Filter capacitors C3, C6 are connected in parallel with each other, where an end is connected to the VBAT voltage, and the other end is grounded. The boost module NC (normally closed) is arranged with the diode D1, where a positive end of the diode D1 is grounded, and a negative end of the diode D1 is connected to the VBAT. Capacitor C7, C8, C9 are connected in parallel with each other, where an end is connected to a VSYS boost output intermediate node pin 1 of the charging chip U1, and the other end is grounded. By arranging the voltage regulator filter circuit in the charging output filter current, the voltage is stabilized. A Pin 0 of the charging chip U1 is grounded.

The working principle of the boost module is as follows.

After the MOS tube of the charging chip U1 connected to the inductor L1 is turned on, the inductor L1 is grounded, and the inductor L1 begins to store energy with the increase in current within the inductor L1; after the MOS tube of the charging chip U1 connected to the inductor L1 is turned off, the inductor L1 releases the stored energy, in which case the inductor L1 is connected in series and superimposed with the USB voltage VBUS to play a boosting effect, for charging the BAT battery through the synchronous boost circuit; the MOS tube of the charging chip U1 is controlled by its internal logic, and when the charging chip U1 is not working, the MOS tube shuts down the chip output to prevent the risk of leakage.

Referring to FIG. 91, in some embodiments, the charging voltage preset module has the following features: a resistor R3 is arranged, with an end being connected to a VSET voltage setting pin 4 of the charging chip U1, and the other end being grounded; the charging chip U1 is configured to determine how much charging voltage is to be output according to a detected electrical signal of a R4. The battery boost charging circuit is configured to set the charging voltage through the charging voltage preset module.

In some embodiments, the over-temperature protection module has the following features: an end of the thermistor R4 is connected to an NTC thermistor pin 3 of the charging chip U1, and the other end of the thermistor R4 is grounded; the charging chip U1 is configured to determine the battery temperature by detecting the voltage of the thermistor R4, so as to realize the over-temperature protection function of the charging module. The battery boost charging circuit can thereby realize the over-temperature protection function through the over-temperature protection module.

In some embodiments, the charging status indication module has the following features: a resistor R5 is arranged, with an end being connected to a LED charging indicator pin 5 of the charging chip U1, and the other end being grounded, where the LED charging indicator pin 5 of the charging chip U1 is configured to output a charging status signal PG. The battery boost charging circuit is configured to output and display the charging status through the charging status indication module.

Referring to FIG. 92, in some embodiments, the battery boost charging circuit is arranged with a charging communication module including the following. A pin 2 of the interface J1 is connected to pin 5 of the interface J1 to output the USB voltage VBUS of the boost charging circuit. A CC1 configuration channel first pin 3 of the interface J1 and a CC2 configuration channel second pin 4 of the interface J1 are connected to a pull-down resistors R6 and R7, respectively. The other ends of the resistors R6 and R7 are both grounded. The voltage values of CC1 and CC2 are detected to realize the identification of cable connection and removal, socket/plug direction, and so on. Pins 1, 6, 7 and 8 of interface J1 are grounded. The battery boost charging circuit is configured to identify the USB voltage through the charging communication module. Capacitors C10 and C11 have an end connected to the USB voltage VBUS, and the other end of the capacitors is grounded to: filter the current, stabilize the voltage, and avoid spike voltage. The USB voltage VBUS is grounded through a discharge resistor R8 to avoid unnecessary power consumption.

As shown in FIG. 93, in an embodiment, the battery boost charging circuit is further arranged with circuit transfer interfaces BD, P1, P2, to transfer circuit signals from the portable fan.

The interface BD is connected to a dip switch, to receive a P_EN enable signal of the dip switch and transmits it to the master control chip of the portable fan through the interface P2, for controlling the locking or operation of the portable fan.

The interface P1 is configured to receive gear adjustment signals KEY, KEY_X, and KEY_Y of the portable fan and transmits them to the master control chip of the portable fan through the interface P2, for controlling the starting/stopping and gear adjustment of the portable fan.

The interface P2 is configured to receive the VBAT battery voltage, the USB voltage VBUS, and the PG signal transmitted by the charging chip U1 and transmits them to the master control chip of the portable fan.

Embodiment of FIG. 94-FIG. 106 illustrate a portable bladeless fan.

As shown in FIGS. 94 to 100, which are schematic diagrams of a portable bladeless fan 100 according to a first embodiment of the present disclosure, the portable bladeless fan 100 is a hand-held bladeless fan, and the portable bladeless fan 100 includes a handle 5 for the user to hold. Of course, the portable bladeless fan 100 may be a clamping fan configured with a clip, a transformable fan configured with a bendable member for shaping and winding, a desktop fan configured with a stand, a floor fan configured with a telescopic stand, or a small fan not configured with the handle 5, clip, bendable member, stand, telescopic stand, etc., without being limited herein.

In other embodiments, a semiconductor cooling member (not shown) may be arranged on the handle 5, such that the user may carry the portable bladeless fan 100 by means of the handle 5, and the semiconductor cooling member may automatically correspondingly adjust the cooling temperature according to the temperature of a portion that the user is in contact with the handle 5, thereby enhancing the user's comfort in carrying the fan. It should be understood that the portable bladeless fan 100 is configured for blowing airflow to dissipate heat and cool down, and correspondingly, the semiconductor cooling member is configured for refrigeration. When a heating element is added to the portable bladeless fan 100 for heat preservation, the semiconductor cooling member may further be configured for heat production to keep warm.

As shown in FIGS. 94 to 96, the portable bladeless fan 100 includes a housing 1, a pressurizing member 3, and a mix-flow fan 2, the housing 1; a profile of the radial cross-section of each of the housing 1, the pressurizing member 3, and the mix-flow fan 2 has a substantially circular shape. The pressurizing member 3 is connected to a front side portion of the housing 1, and the pressurizing member 3 and the housing 1 are integrally molded. Of course, the pressurizing member 3 and the housing 1 may be separately molded, and the pressurizing member 3 is assembled to the housing 1. The mix-flow fan 2 is disposed in the housing 1 and is connected to a rear side of the pressurizing member 3, and the mix-flow fan 2 is rotatable around a rotation shaft 212 to generate an airflow. The extension direction perpendicular to and through the rotation shaft 212 is a radial direction, and the direction parallel to the rotation shaft 212 is an axial direction.

As shown in FIGS. 95 to 97, a rear side of the housing 1 is arranged with an air inlet portion 11 and, and a rear side of the housing 1 is arranged with an air outlet portion 12, the air inlet portion 11 and the air outlet portion 12 being connected within the housing 1. The air inlet portion 11 is disposed on an air inlet plate 13 and the air outlet portion 12 is disposed between a front end of the pressurizing member 3 and a front end of the housing 1. A lower end of the housing 1 forms the handle 5 for hand-held use by the user. The housing 1 includes a first housing 1a and a second housing 1b that can be mated with each other in a front-back direction. The first housing is firstly gradually increased along a radial direction of the air inlet portion from the front side to the rear side and is subsequently increased along the radial direction from the rear side to the front side. The second housing is gradually decreased along the radial direction from the rear side to the front side. The first housing 1a first extends radially enlarged backwardly only with a small section, that is, the first housing 1a as a whole can be considered to extend radially enlarged forwardly, such that the whole is curved and has a beautiful appearance. The small section of the first housing 1a extending radially enlarged backward may make the air inlet plate 13 partially received in the first housing 1a, such that the air inlet plate 13 will not be so obvious and unharmonious. The ratio of the length between front and rear ends of the first housing 1a and the length between front and rear ends of the second housing 1b is 0.9 to 1 or 1 to 1.2, which may achieve miniaturization while reasonably balancing a good relationship between the air volume and the airflow pressure. Further, the ratio close to 1:1 may make the first housing 1a and the second housing 1b more aesthetically pleasing in appearance.

As shown in FIGS. 95 to 97, the mix-flow fan 2 includes a rotation seat 21 and a plurality of first blades 22, where the rotation seat 21 includes a radially enlarged airflow guiding surface 211 from back to front; the plurality of the first blades 22 are connected to and arranged on the airflow guiding surface 211. The plurality of the first blades 22 are spaced apart from each other. Specifically, the plurality of the first blades 22 are arranged equidistant on the airflow guiding surface 211. Each first blade 22 extends helically at a predetermined angle from back to front and along a circumferential direction of the airflow guiding surface 211. When viewed from back to front, the space between any two adjacent the first blades 22 on their front ends is longer than the space between the two adjacent the first blades 22 on their rear ends, which may facilitate increasing the air inlet. The rotation seat 21 is substantially in the shape of a truncated cone, i.e., the rotation seat 21 has a radial cross-sectional area at its rear end smaller than a radial cross-sectional area at its front end. That is, the rotation seat 21 has a relatively large radial cross-section at its front end. The rotation seat 21 further includes an extension wall 213 connected to an inner wall of the rotation seat 21 and extending forwardly, the extension wall 213 together with the rotation seat 21 enclosing to define a first cavity 214 with an opening facing forwardly.

As shown in FIGS. 97 and 98, at least a portion of the airflow guiding surface 211 is recessed towards the rotation shaft 212. It should be understood that at least a portion of the airflow guiding surface 211 may be recessed towards the rotation shaft 212 to allow the mix-flow fan 2 to gather an expanded air volume and create a high air pressure. Of course, the airflow guiding surface 211 may be an inclined plane or may be at least partially protruding towards a direction away from the rotation shaft 212, which is not limited herein.

As shown in FIGS. 96 to 98, the pressurizing member 3 includes a pressurizing seat 31 and a plurality of second blades 32, where the pressurizing seat 31 includes a pressurizing surface 311 that is at least partially radially enlarged from back to front; the plurality of the second blades 32 are connected to and arranged on the pressurizing surface 311. The plurality of the second blades are spaced apart from each other. Specifically, the plurality of the second blades 32 are arranged equidistantly on the pressurizing surface 311; the plurality of the second blades 32 are connected to the housing 1. After an oblique airflow generated by the mix-flow fan 2 flows to the pressurizing surface 311, the plurality of the second blades 32 re-arrange and transform the airflow to form a direct current airflow blowing out parallel to the rotation shaft 212, so as to increase the blowing distance and reduce the turbulence, noise, and vibration, which may reduce the noise emitted from the turbulence crosstalk for realizing noise reduction, and to convert the sharp sound into a low sound, thereby reducing the noise of the mixed-flow airflow generated by the mix-flow fan 2. In addition, a static pressure may be increased, energy consumption may be reduced, and the concentration of the air out of the mix-flow fan 2 may be enhanced. That is, the second blades 32 may equalize the airflow formed by the mix-flow fan 2 and increase the airflow pressure. The pressurizing seat 31 is connected to the housing 1 through the second blades 32, the rotation seat 21 is connected to the pressurizing seat 31 through a fixing fit structure, and the mix-flow fan 2 is relatively fixed in the housing 1 through the pressurizing seat 31. A radius value of a maximum radius surface on a front end of the pressurizing member 3 is 21.3 to 22 mm, such that the portable bladeless fan is easy to carry while ensuring sufficient air volume and air pressure.

As shown in FIGS. 96 to 98, at least a portion of the pressurizing surface 311 is radially enlarged from back to front, while at least a portion of the pressurizing surface 311 is recessed towards the rotation shaft 212. At least a portion of the airflow guiding surface 211 and at least a portion of the pressurizing surface 311 are both radially recessed, to form concave surfaces for absorbing some noise from the airflow. Specifically, the pressurizing surface 311 is generally radially increasing from back to front. Of course, in other embodiments, in the direction from back to front, the pressurizing surface 311 may extend forward parallel to the rotation shaft 212 before radially increasing, or extend radially decreasing and then radially increasing, which is not limited herein.

As shown in FIGS. 96 to 98, the pressurizing seat 31 is substantially in the shape of a truncated cone, i.e., the pressurizing seat 31 has a radial cross-sectional area at its rear end smaller than a radial cross-sectional area at its front end. That is, the pressurizing seat 31 has a relatively large radial cross-section at its front end. A radius of the radial cross-section on the front end of the pressurizing seat 31 is 21.3 to 22 mm, for expanding the air blowing area while ensuring sufficient air volume and air pressure. Each of the airflow guiding surface 211 and the pressurizing surface 311 is generally radially enlarged in a flared shape to form an outwardly expanding pressurizing ramp, and the pressurizing seat 31 has a thickness of 9.5˜14.5 mm in the front-back direction to greatly increase the pressurizing stroke of the airflow. Further, the pressurizing ramp may cooperate with the housing 1 to convert the sharp noise into a low sound. In the direction from back to front, the pressurizing seat 31 extends radially enlarged and the second housing 1b extends radially reduced. That is, the second housing 1b and the pressurizing seat 31 extend forward while extending close to each other, such that the airflow is pressurized out of a gap defined by the front end of the pressurizing seat 31 and the front end of the second housing 1b, which is conducive to increasing the airflow force, the airflow pressure, and the distance of the air delivery.

As shown in FIGS. 97 and 98, the rotation seat 21 and the pressurizing seat 31 are arranged in close spacing in the axial direction, the airflow guiding surface 211 and the pressurizing surface 311 are arranged in close spacing in the axial direction, and a spacing between the rotation seat 21 and the pressurizing seat 31 in the axial direction and a spacing between the airflow guiding surface 211 and the pressurizing surface 311 in the axial direction are each 1˜4 mm, thereby enabling the mix-flow fan 2 to form a smooth airflow to the pressurizing surface 311, and thus reducing the noise generated by turbulent flow. The radial cross-section of the rotation seat 21 at its front end and the radial cross-section of the pressurizing seat 31 at its rear end are each circular, with a very small difference in radii. In some embodiments, the difference in radii between the radial cross-section of the rotation seat 21 at its front end and the radial cross-section of the pressurizing seat 31 at its rear end is less than 1 mm, allowing the airflow generated by the mix-flow fan 2 to flow smoothly to the pressurizing surface 311.

As shown in FIGS. 96 to 98, the pressurizing seat 31 defines a second cavity 313 with an opening facing downwardly, the extension wall 213 is inserted forwardly into the second cavity 313, and the first cavity 214 and the second cavity 313 at least partially overlap in the radial direction to reduce the occupied space. The mix-flow fan 2 further includes a motor 23, the motor 23 being an external rotor brushless motor 23, and the motor 23 is received in the first cavity 214 and the second cavity 313. The opening of the first cavity 214 and the opening of the second cavity 313 face towards and are communicated with each other to shield noise generated by the motor 23 and airflow noise, thereby converting the sharp noise into la ow sound. Further, the fixing fit structure of the mix-flow fan 2 and the pressurizing member 3 is received in the first cavity 214, making excellent use of space. The fixing fit structure specifically includes the rotation shaft 212 protruding forwardly from within the first cavity 214 and a post 312 formed by protruding backwardly from the second cavity 313, the rotation shaft 212 being inserted into the post 312 and fixed through a bearing part. The external rotor brushless motor 23 has a service life of up to 15,000 hours and is free of the electrical sparks generated during operation of the brushed motor 23, which may greatly reduce the interference of the electrical sparks to a remote-control radio equipment. Further, the friction is greatly reduced during operation in a brushless manner, which results in smooth operation and good noise reduction.

As shown in FIGS. 97 and 98, a safe pressurized distance exists between the air inlet plate 13 and a rear end of the rotation seat 21, allowing for a maximum pressurized deformation of the air inlet plate 13 within an allowable pressure range regarding material properties of the air inlet plate 13. In the embodiments, the distance between the air inlet plate 13 and the rear end of the rotation seat 21 is 5.5 to 7.5 mm, in order to have space at the rear end for the entry of a high volume of air, and have space for a maximum pressurized deformation of the air inlet plate 13 when subjected to the high volume of air. The radial cross-sectional area of the air inlet plate 13 is greater than or equal to a maximum radial cross-sectional area of the rotation seat 21, to ensure sufficient air inlet and to achieve noise reduction, thereby converting the sharp noise into a low sound. The radial cross-sectional area of the air inlet plate 13 is less than or equal to the radial cross-sectional area of the pressurizing seat 31 at its front end, and the air inlet portion 11 on the air inlet plate 13 is obscured by the pressurizing seat 31. When the portable bladeless fan is in use, the air inlet portion 11 is not visible when viewing from front to back, i.e. light from the air inlet portion 11 is not projected from back to front, thereby reducing the effect of the rotation of the mix-flow fan 2 on the human eyes. As the rotation seat 21 is radially enlarged from back to front, the first blades 22 are closer to the air inlet plate 13 compared to the rotation seat 21, thereby enhancing a suction capacity of the mix-flow fan 2.

As shown in FIGS. 97 and 98, the front end of the pressurizing member 3 is recessed backwardly, and the front end of the pressurizing member 3 is further arranged with a front cover 33. The front cover 33 is recessed backwardly to form a negative pressure region 331, such that a localized airflow runs closely along a front surface of the front cover 33 after being blown out of the air outlet portion 12, thereby performing an airflow-compensation on the negative pressure region 331 and reducing turbulence. In other embodiments, the front cover 33 may be an IP image item that is detachable and interchangeable, and the front cover 33 may be exposed or covered by at least partially transparent material to enhance user interaction with the IP image item. By setting up the detachable and interchangeable front cover 33, the need to customize different molds for different partners may be avoided. That is, a set of molds can be applied to multiple IP partners, which may reduce the production cost of the IP partners by about 40%. Further, the exposed IP image item may increase the user's direct touching of the IP image item, thereby changing the traditional experience of using the IP image item. The front cover 33 may be configured to hold an aromatherapy component or a component that combines humidification and aromatherapy, or to store a USB cable, or as a mirror with LED lights, etc., which is not limited herein.

As shown in FIGS. 96 to 98, the portable bladeless fan 100 further includes a booster 4 that is arranged inside the housing 1 and surrounds a periphery of the mix-flow fan 2. In addition to having the effect of pressurization, the booster 4 further has a noise reduction effect similar to that of acoustic glass. A first channel T1 is formed between the mix-flow fan 2 and the booster 4, a second channel T2 is formed between the pressurizing member 3 and the housing 1, and the first channel T1 and the second channel T2 together form a pressurizing guiding channel T. The airflow is conducted from the air inlet portion 11 through the pressurizing guiding channel T, and then is conducted out from the air outlet portion 12. A front end of the booster 4 is connected to a portion of the pressurizing member 3 near the second housing 1b, i.e. the booster 4 is assembled forwardly to a rear side of the second blades 32. A rear end of the booster 4 is connected to a portion of the first housing 1a near the air inlet portion 11, with a spacing being defined between the booster 4 and the first housing 1a, for absorbing the noise generated by the rotation of the mix-flow fan 2.

As shown in FIGS. 96 to 98, the booster 4 includes a booster surface 41 facing the mix-flow fan 2 and at least partially radially enlarged from back to front. At least a portion of the airflow guiding surface 211 and at least a portion of the pressurizing surface 311 are both radially recessed, to form concave surfaces, while at least a portion of the booster surface 41 is radially protruding to form a convex surface, thereby increasing the volume within the pressurizing guiding channel T to gather the air volume. The distance of a minimum radial gap between the first blades 22 and the pressurizing surface 41 is maintained within an error range of an equivalent isolation distance, to isolate the airflow generated by the mix-flow fan 2 at its front end from flowing back around the minimum radial gap to its rear end, thereby increasing air pressure and reducing the noise from turbulent crosstalk.

As shown in FIGS. 96 to 98, the front end of the booster 4 is flush with a front end of the mix-flow fan 2, or the front end of the booster 4 protrudes forwardly over the front end of the mix-flow fan 2, for fully pressurizing. The height of the front end of the booster 4 is 1.4 to 3.7 mm, and the front end of the booster 4 and the housing 1 are stepped, such that the high-pressure air formed by the mix-flow fan 2 may flow quickly to the pressurizing member 3.

As shown in FIGS. 96, 97, 99 and 100, one of the second blades 32 defines a wire-through slot 321. In the embodiments, the second blade 32 connected to the handle 5 defines the wire-through slot 321, the wire-through slot 321 being in communication with the first cavity 214. At least a portion of a motherboard 6 is arranged in the handle 5. In the embodiments, a portion of the motherboard 6 is arranged in the handle 5, and another portion of the motherboard 6 is arranged in the housing 1, where the motherboard 6 is disposed behind the wire-through slot 321 in the front-back direction, and the motherboard 6 at least partially overlaps with the wire-through slot 321 in the front-back direction. A wire 7 connects the motor 23 to the motherboard 6, and specifically, the wire 7 is connected from the motor 23 to the motherboard 6 through the wire-through slot 321. The motherboard 6 includes a first surface 61 and a second surface 62 parallel to each other, the first surface 61 facing backwardly, and the second surface 62 facing forwardly. An end of the wire 7 is connected to the motor 23, and the other end of the wire 7 is connected to the motherboard 6 and disposed on the first surface 61. If the wire 7 is arranged on the second surface 62 of the motherboard 6, an assembler will have to mount the motherboard 6 in the housing 1 and the handle 5 with the wire 7 being obscured, which may result in the assembler not being able to ensure that the wire 7 is not squeezed by the motherboard 6, such that the wire 7 is easily pressed and damaged, the assembly is inconvenient, and is prone to be reworked. Therefore, the arrangement of the wire 7 on the first surface 61 of the motherboard 6 is conducive to improving assembly quality and assembly efficiency.

As shown in FIG. 96, FIG. 97, FIG. 99 and FIG. 100, a rear side of the wire-through slot 321 is further arranged with a wire ramp 8 to restrict the wire 7 from moving. Each of both ends of the wire-through slot 321 is arranged with a resisting block 322 extending backwardly, the resisting block 322 being abutted against the wire ramp 8 to restrict the wire ramp 8 from moving on a mounting plane. An end of the wire ramp 8 near the motor 23 extends toward the wire-through slot 321 to form a snap 81, the snap 81 being snap-fitted to the resisting block 322 through the wire-through slot 321 to limit a backward movement of the wire ramp 8. An end of the wire ramp 8 away from the motor 23 extends toward the wire-through slot 321 to form an insertion block 82, the insertion block 82 being insertion-fitted to the wire-through slot 321 to limit a forward movement of the wire ramp 8. The wire ramp 8 is further arranged with a tab 83 facing the wire-through slot 321, the tab 83 compressing the wire 7 to prevent a rear end of the wire 7 from oscillating in the wire-through slot 321 when the portable bladeless fan is in use, thereby reducing a noise generated by oscillating friction between the wire 7 and the wire-through slot 321.

As shown in FIGS. 96, 97, 99 and 100, the second surface 62 is arranged with a light emitting member 63, the handle 5 defines an aperture 51 corresponding to the light emitting member 63, and a side of the wire-through slot 321 away from the motor 23 is arranged with a light guide post 52. An end of the light guide post 52 abuts against the second surface 62, and the other end of the light guide post 52 is connected to an inner side of the handle 5. Light emitted by the light emitting member 63 is directed along the light guide post 52 and out from the aperture 51. A spacing exists between the booster 4 and the light guide post 52. The wire 7 passes through the wire-through slot 321 and through the spacing between the booster 4 and the light guide post 52, around an outer wall of the booster 4, and then is electrically connected to the first surface 61, which may lead to a more compact and smaller overall structure and higher space utilization.

As shown in FIGS. 101 to 106, which are schematic diagrams of a portable bladeless fan 100 according to a second embodiment of the present disclosure, the portable bladeless fan 100 is larger and flatter than the portable bladeless fan 100 of the first embodiment. In this embodiment, the ratio of the length between the front and rear ends of the first housing la and the length between the front and rear ends of the second housing 1b is 1˜1.5, which may reasonably balance the relationship between the air volume and the air pressure while realizing lightness and thinness of the portable bladeless fan. A radius value of a maximum radial surface on the front end of the pressurizing member 3 is 28˜35 mm, i.e. a radius of a radial cross-section on the front end of the pressurizing seat 31 is 28˜35 mm, which may expand the air blowing area while ensuring sufficient airflow volume and airflow pressure. The extension wall 213 does not forwardly protrude over the rotation seat 21 and the extension wall 213 is not forwardly inserted into the second cavity 313. The first cavity 214 and the second cavity 313 are arranged in close proximity to each other in a spaced apart manner, while the first cavity 214 and the second cavity 313 do not overlap with each other. The distance between the air inlet plate 13 and the rear end of the rotation seat 21 is 7.4 to 9.8 mm. The pressurizing surface 41 is a smooth surface for a smoother airflow towards the pressurizing member 3.

As shown in FIG. 104, in the embodiments, the motherboard 6 is disposed entirely within the handle 5, and the motherboard 6 is disposed below the wire-through slot 321. The first surface 61 of the motherboard 6 faces upwardly and the second surface 62 faces downwardly. The light emitting member 63 is disposed on the first surface 61. The aperture 51 is disposed on the second housing 1b and is connected to an inner side of the second housing 1b corresponding to the light guide post 52. A spacing exists between the booster 4 and the first surface 61. The wire 7 pass through the wire-through slot 321 and through the spacing between the booster 4 and the first surface 61, and is electrically connected to the first surface 61. The constituent elements in the second embodiment are substantially the same as those in the first embodiment, which will not be repeated herein.

Claims

1. A portable bladeless fan, comprising: a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing;a mix-flow fan, arranged inside the housing and configured to rotate about a rotation shaft to generate an airflow;a pressurizing member, connected to a front portion of the housing and disposed at a front of the mix-flow fan, wherein the pressurizing member comprises a pressurizing seat and a plurality of second blades, the pressurizing seat comprises a pressurizing surface that is at least partially increased in a radial direction from the rear side to the front side, the plurality of the second blades are spaced apart from each other and are arranged on and connected to the pressurizing surface, the plurality of the second blades are connected to the housing, the airflow generated by the mix-flow is capable of being converted into a high-pressure airflow after flowing through the pressurizing surface, the plurality of the second blades are configured to re-arrange a direction of the airflow and to reduce a noise of the airflow to convert a sharp sound into a low sound.

2. The portable bladeless fan according to claim 1, wherein, the mix-flow fan comprises a rotation seat and a plurality of first blades;the rotation seat comprises an airflow guiding surface that is increased in the radial direction from the rear side to the front side, the plurality of the first blades are spaced apart from each other and are arranged on and connected to the airflow guiding surface;the airflow guiding surface and the pressurizing surface are increased in the radial direction to have a flared shape and to form an outwardly expanding pressurizing ramp, the pressurizing ramp is configured to increase a pressurizing path of the airflow, the pressurizing ramp and the housing are cooperatively configured to convert the sharp sound into the low sound.

3. The portable bladeless fan according to claim 2, wherein, the rotation seat and the pressurizing seat are directly adjacent to each other and are spaced apart from each other axially;the airflow guiding surface and the pressurizing surface are directly adjacent to each other and are spaced apart from each other in an axial direction; andeach of a spacing between the rotation seat and the pressurizing seat in the axial direction and a spacing between the airflow guiding surface and the pressurizing surface in the axial direction is in a range from 1 mm to 4 mm to guide the airflow generated by the mixed-flow fan to flow smoothly to the pressurizing surface and to reduce a noise generated by a turbulent flow.

4. The portable bladeless fan according to claim 2, wherein, the rotation seat defines a first chamber having an opening facing to the front side;the pressurizing seat defines second chamber having an opening facing to the rear side;the first chamber and the second chamber are at least partially overlapping with each other in the radial direction;the mix-flow fan comprises a motor received in the first chamber and the second chamber, the opening of the first chamber and the opening of the second chamber face towards and are communicated with each other to shield noise generated by the motor to convert the sharp sound to the low sound.

5. The portable bladeless fan according to claim 1, wherein, a cross section of a front portion of the pressurizing seat, taken along the radial direction, has a radius of 21.3 mm to 22 mm; or a cross section of a front portion of the pressurizing seat, taken along the radial direction, has a radius of 28 mm to 35 mm to increase an airflow area without reducing an airflow amount and an air pressure; anda thickness of the pressurizing seat in a front-rear direction is in a range from 9.5 mm to 14.5 mm.

6. The portable bladeless fan according to claim 1, wherein, a front end of the pressurizing member is recessed towards the rear side;a front cover is arranged at the front end of the pressurizing member, the front cover is recessed towards the rear side to form a negative pressure region to guide a localized airflow, after flowing out of the air outlet portion, to flow attachingly along a front surface of the front cover to compensate the negative pressure region and to reduce turbulence.

7. A portable bladeless fan, comprising: a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing;a pressurizing member, connected to a front portion of the housing;a mix-flow fan, arranged inside the housing and connected to a rear of the pressurizing member, wherein the mix-flow fan is configured to rotate about a rotation shaft to generate an airflow;a booster, arranged inside the housing and surrounding a periphery of the mix-flow fan;wherein a first channel is formed between the mix-flow fan and the booster, a second channel is formed between the pressurizing member and the housing, the first channel and the second channel cooperatively form a pressurizing conduction channel, the airflow is capable of flowing from the air inlet portion, passing through the pressurizing guiding channel, to reach the fan outlet portion.

8. The portable bladeless fan according to claim 7, wherein, the housing comprises a first housing and a second housing connected to the first housing;the first housing is firstly gradually increased along a radial direction of the air inlet portion from the front side to the rear side and is subsequently increased along the radial direction from the rear side to the front side;the second housing is gradually decreased along the radial direction from the rear side to the front side; andthe booster is spaced apart from the first housing to absorb the noise generated by rotation of the mix-flow fan.

9. The portable bladeless fan according to claim 7, wherein, the mix-flow fan comprises a rotation seat, the rotation seat comprises an airflow guiding surface and a plurality of first blades, the airflow guiding surface is at least partially gradually increased in the radial direction from the rear to the front, the plurality of first blades are arranged on and connected to the airflow guiding surface and are spaced apart from each other;the pressurizing member comprises a pressurizing seat and a plurality of second blades, the pressurizing seat comprises a pressurizing surface that is at least partially increased in the radial direction from the rear side to the front side, the plurality of the second blades are spaced apart from each other and are arranged on and connected to the pressurizing surface, the plurality of the second blades are connected to the housing; andthe booster comprises a booster surface that faces the mix-flow fan and is at least partially increased in the radial direction from the rear side to the front side.

10. The portable bladeless fan according to claim 9, wherein, each of at least a portion of the airflow guiding surface and at least a portion of the pressurizing surface is radially recessed to form a concave surface, at least a portion of the pressurizing surface is radially protruded to form a convex surface; a volume within the pressurized airflow guiding channel is increased to gather the airflow.

11. The portable bladeless fan according to claim 9, wherein, a minimum radial gap between the first blades and the pressurizing surface is maintained within an error range of an equivalent separation distance to prevent the airflow at a front end of the mix-flow from flowing around the minimum radial gap to flow reversely to a rear end of the mix-flow.

12. The portable bladeless fan according to claim 7, wherein a front end of the booster is aligned with a front end of the mix-flow fan; ora front end of the booster is protrudes from a front end of the mix-flow fan.

13. The portable bladeless fan according to claim 7, wherein a height of the front end of the booster is in a range from 1.4 mm to 3.7 mm, the front end of the booster and the housing form a stepped shape to guide a high-pressure airflow generated by the mix-flow fan to flow quickly to the pressurizing member.

14. A portable bladeless fan, comprising: a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing, and a handle is arranged at a lower side of the housing;a pressurizing member, comprising a pressurizing seat and a plurality of second blades that are spaced apart from each other and are arranged on and connected to a radial outside of the pressurizing seat, wherein the pressurizing seat defines a first cavity having an opening facing to the rear side, the plurality of the second blades are connected to a front portion of the housing, and one of the plurality of second blades defines a wire-through slot communicating with the first cavity;a mix-flow fan, arranged inside the housing and connected to a rear side of the pressurizing member, wherein the mix-flow fan is configured to rotate about a rotation shaft to generate an airflow, the mix-flow fan comprises a motor, a rotation seat and a plurality of first blades, the plurality of the first blades are spaced apart from each other and are arranged on a radial outside of the rotation seat, the motor is configured to drive the rotation seat and the plurality of the first blades to rotate, the rotation seat defines a second cavity having an opening facing towards the front side, the motor is received in the first cavity and the second cavity;a main board, at least partially arranged inside the handle, wherein a wire is arranged to connect the motor to the main board; and the wire extends from the motor, passing through the wire-through slot, to the main board.

15. The portable bladeless fan according to claim 14, wherein, the main board has a first side and a second side parallel to the first side, the first side faces toward the rear side, and the second side faces toward the front side;an end of the wire is connected to the motor, and the other end of the wire is connected to the main board and disposed on the first side.

16. The portable bladeless fan according to claim 15, wherein, a wire ramp is disposed at a rear of the wire-through slot and is configured to limit movement of the wire, two ends of the wire-through slot extend towards the rear side to arrange resisting blocks, the resisting blocks abuts against the wire ramp to limit movement of the wire ramp on a mounting plane.

17. The portable bladeless fan according to claim 16, wherein an end of the wire ramp near the motor extends towards the wire-through slot to be arranged with a snap, the snap extends through the wire-through slot to be snapped with the resisting blocks to limit the wire ramp from moving towards the rear side;an end of the wire ramp away from the drive assembly extends toward the wire-through slot to be arranged with an insertion block, the insertion block is inserted in the wire-through slot.

18. The portable bladeless fan according to claim 15, wherein the second side is arranged with a light-emitting member;the handle defines an opening corresponding to the light-emitting member;a light guide post is disposed at a side of the wire-through slot away from the motor, an end of the light guide post abuts against the second side, the other end of the light guide post is connected to an inside of the handle, and light emitted by the light-emitting member propagates along the light guide post to be emitted out of the fan through the opening of the handle.

19. The portable bladeless fan according to claim 18, further comprising: a booster, disposed inside the housing and surrounds a periphery of the mix-flow fan, wherein the booster is connected to a rear side of the second blades;wherein, a space is defined between the booster and the light guide post; the wire passes through the wire-through slot and the space between the booster and the light guide post, extends along an outer wall of the booster, and is further electrically connected to the first side.

20. The portable bladeless fan according to claim 14, wherein the portable bladeless fan is a hand-held bladeless fan arranged with a handle or a clamped fan arranged with a clip or a transformable fan arranged with a bendable member for shaping and winding or a desktop fan arranged with a stand, a floor fan arranged with a telescopic stand.