Patent Application
20240298852
The present disclosure relates to the field of electrical fans, and more particularly, to an electrical fan and a cleaning device having the same.
In recent years, high-speed brushless motors have progressively evolved towards higher power, smaller size and lighter weight. Simultaneously, domestic and international demands for reduced noise levels in household appliances, such as vacuum cleaners, have increased. However, due to size constraints, the higher the power of the fan is, the greater the speed is. The increase in speed will results in higher noise levels, and the noise problem caused by speed is yet to be solved.
The present disclosure aims to at least partially address one of the technical problems in the existing technology. To this end, the present disclosure provides a fan and a cleaning device with same, which can reduce the noise of the fan and reduce the noise impact caused by the increase in speed.
According to an embodiment of the first aspect of the present disclosure, a fan includes: a housing assembly; a fan cover mounted on the housing assembly, the fan cover fitting with the housing assembly to form an accommodating cavity; a wind wheel arranged in the accommodating cavity, the wind wheel fitting with a side wall of the accommodating cavity to define an air inlet channel; and a first diffuser arranged in the accommodating cavity and including a plurality of first fan blades and a mounting hub, the mounting hub, the plurality of first fan blades and the side wall of the accommodating cavity fit to define a first diffusing channel, the air inlet channel and the first diffusing channel are communicated in sequence, the plurality of first fan blades are arranged on an outer edge of the mounting hub, along an airflow direction, each of the plurality of first fan blades has a front edge, the end of the front edge of the first fan blade connected to the mounting hub is a first end, the end of the front edge of the first fan blade away from the mounting hub is a second end, and the second end is closer to the air inlet channel than the first end along the axial direction of the mounting hub.
The fan according to the embodiment of the first aspect of the present disclosure has at least the following beneficial effects: when the wind wheel rotates, air enters the air inlet channel; along the axial direction of the mounting hub, the airflow transitions from the air inlet channel to the first diffusing channel by arranging the second end closer to the air inlet channel than the first end, and the airflow is in contact with the first fan blades earlier and enters the first diffusing channel more smoothly, thereby reducing the diffusion and impact loss of the airflow and reducing aerodynamic noise.
According to some embodiments of the present disclosure, the connection line between the first end and the second end is defined as a first connection line, and an included angle between the first connection line and a radial line of the mounting hub as a, which satisfies: 25°≤a≤70°.
According to some embodiments of the present disclosure, the wind wheel includes a plurality of second fan blades, and the width of each of the plurality of second fan blades gradually decreases along an axial direction of the wind wheel.
According to some embodiments of the present disclosure, the ratio of the maximum width of the second fan blade to the minimum width of the second fan blade is x, which satisfies: 1.3≤x≤2.1.
According to some embodiments of the present disclosure, the second fan blade has a clearance fit with the inner wall of the fan cover, and the distance between the second fan blade and the inner wall of the fan cover is d, which satisfies: 0.12≤d≤0.5 mm.
According to some embodiments of the present disclosure, the number of the second fan blades is z2, and the number of the first fan blades is z1, satisfying: z2<z1, and 7≤z2≤9.
According to some embodiments of the present disclosure, the housing assembly is further provided with a second diffuser, which includes an inner cylinder, an outer cylinder, and a plurality of third fan blades. The inner cylinder is docked with the mounting hub, the third fan blades are circumferentially distributed on the outer periphery of the inner cylinder, a second diffusing channel is defined among the inner cylinder, the outer cylinder and the third fan blades, and the air inlet channel, the first diffusing channel and the second diffusing channel are communicated in sequence.
According to some embodiments of the present disclosure, along the axial direction of the second diffuser, the distance between a tail end of each of the plurality of third fan blades and a tail end of the inner cylinder is H1, and the distance between the tail end of each of the plurality of third fan blades and a tail end of the outer cylinder is H2, satisfying: H2>H1.
According to some embodiments of the present disclosure, the number of the third fan blades is z3, the number of the first fan blades is z1, satisfying: z3>z1.
According to some embodiments of the present disclosure, along the axial direction of the first diffuser, the axial length of the air inlet channel is h1, the axial length of the first diffusing channel is h2, and the axial length of the second diffusing channel is h3, satisfying: h1>h2>h3.
According to an embodiment of the second aspect of the present disclosure, a cleaning device includes the fan according to the embodiment of the first aspect of the present disclosure.
The cleaning device according to the embodiment of the second aspect of the present disclosure has at least the following beneficial effects: when the wind wheel rotates, air enters the air inlet channel along the air inlet end of the fan cover; when the airflow transitions from the air inlet channel to the first diffusing channel, the airflow enters the first diffusing channel more smoothly after passing through the first fan blades, thereby reducing the diffusion and impact loss of airflow and reducing aerodynamic noise.
Additional aspects and advantages of the present disclosure will be partly provided in the descriptions below, and in part will be apparent from the description, or may be understood through the practice of the present disclosure.
The above and/or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments in conjunction with the following accompanying drawings, in which:
Reference numerals shown in the figures are described as follows:
Embodiments of the present disclosure are described in detail below, with examples of the embodiments illustrated in the accompanying drawings, the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and serve only to explain the present disclosure, and should not be construed as limitations of the present disclosure.
In the description of the present disclosure, it should be understood that, referring to orientation description, the instructed orientation or positional relationships, for example, “upper,” “lower,” “front,” “rear,” “left,” “right,” etc., are based on the orientation or positional relationships shown in the accompanying drawings, these terms are used merely for ease of description of the present disclosure and simplification for the description, rather than indicating or implying that the device or element referred to must have a specific orientation and be constructed and operated in a specific orientation, which, therefore, cannot be construed as limiting the present disclosure.
In the description of the present disclosure, “several” means one or more, “a plurality of” means two or more, “greater than,” “less than,” “over,” etc. are understood to exclude the original number, and “above,” “below,” “within,” etc. are understood to include the original number. If described, “first” and “second” are only for the purpose of distinguishing technical features, and not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence relationship of indicated technical features.
In the description of the present disclosure, unless specifically stated otherwise, words such as “arranging,” “mounting” and “connecting” should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present disclosure combined with the specific content of the technical solution.
Referring to
It can be understood that each first fan blade 410 has a front edge 411 and a trailing edge 412. The end of the front edge 411 of the first fan blade 410 connected to the mounting hub 420 is set as a first end, and the end of the front edge 411 of the first fan blade 410 away from the mounting hub 420 is set as a second end. Along the axial direction of the mounting hub 420, the second end is closer to the air inlet channel than the first end. The connection line between the first end and the second end is defined as a first connection line, and the included angle between the first connection line and a radial line of the mounting hub 420 is an included angle a of the first fan blades 410, satisfying: 25°≤a≤70°.
It can be understood that when the wind wheel 300 rotates, air enters the air inlet channel 101 under the guidance of the wind wheel 300, and the front edges 411 of the first fan blades 410 are inclined upward, that is, along the axial direction of the mounting hub 420, the second ends is closer to the air outlet of the air inlet channel than the first ends, so that the front edges 411 of the first fan blades 410 are closer to the air outlet end of the air inlet channel 101. When the airflow transitions from the air inlet channel 101 to the first diffusing channel 102, after being blown out from the air outlet end of the air inlet channel 101, the airflow is in contact with the first fan blades 410 more quickly and is supported by the first fan blades 410 to reduce the diffusion of the airflow, so that the airflow flows smoothly into the first diffusing channel 102 by following the first fan blades 410. As a result, the impact loss of the airflow can be reduced, aerodynamic noise can be reduced, and the efficiency of the fan at the same time can be improved.
It should be noted that by docking the first diffusing channel 102 with the air inlet channel 101, the airflow formed by the rotation of the wind wheel 300 can be more fully converted into static pressure energy, thereby improving the overall efficiency of the fan.
It can be understood that, referring to
It can be understood that, referring to
It can be understood that, referring to
It can be understood that the wind wheel 300 includes a wheel hub 320, a bottom plate 330, and a plurality of second fan blades 310. The wheel hub 320 is generally cylindrical, and a connecting portion 340 is arranged along the axial direction of the wheel hub 320. The connecting portion 340 is used to connect with an output shaft of a driving apparatus of the electric fan, and the driving device drives the wind wheel 300 to rotate through the rotation of the output shaft. Along the direction of the central axis of the wheel hub 320, the diameter of the outer peripheral surface gradually increases from one end to the other. The outer circumferential surface of the bottom plate 330 gradually narrows from back to front, and is roughly conical in shape. The central axis of the outer circumferential surface coincides with the central axis of the hub 320; that is, the bottom plate 330 and the hub 320 are coaxially arranged, the narrower end of the outer circumferential surface is the air inlet end, and the wider end of the outer circumferential surface is the air outlet end. The plurality of second fan blades 310 are evenly arranged on the outer peripheral surface; that is, the plurality of second fan blades 310 are arranged at equal intervals along the circumference of the outer peripheral surface. Since the outer peripheral surface is a cone which is narrow in the front and wide at the back, and the second fan blades 310 are provided on the outer peripheral surface, the front ends of the second fan blades 310 are relatively close to the central axis of the hub 320. The front ends of the second fan blades 310 are front edge portions, and the front edge portions of the second fan blades 310 are relatively far away from the central axis of the hub 320, while the rear ends of the second fan blades 310 are trailing edge portions, the trailing edge portions of the second fan blades 310 are twisted toward the rotation direction of the wind wheel 300, and the rear ends of the second fan blades 310 are twisted away from the rotation direction of the wind wheel 300.
It should be noted that the wind wheel 300 is a plastic part, while the existing wind wheel 300 is usually made of metal. The cost of the metal wind wheel 300 is relatively high, and the use of the plastic wind wheel 300 can effectively reduce production costs. The wind wheel 300 can be made of plastic, so that its structure needs to be adapted to the demoulding process in the injection molding process. The front edge portions and the trailing edge portions of the second fan blades are twisted in opposite directions, and a parting surface is located in the middle section of the second fan blades and perpendicular to the central axis of the hub 320, so that the front half and the rear half of the wind wheel 300 rotate in opposite directions and are demoulded. The twisted structures at the front and rear ends of the second fan blades enable smooth demoulding, and can effectively reduce the fluid loss of the wind wheel 300 and improve the working performance of the wind wheel 300.
In addition, the wheel hub 320, the bottom plate 330 and the second fan blades are integrally formed by injection molding, which not only ensures the structural and performance stability of the wind wheel 300, but also facilitates molding and simple manufacturing. As a result, the assembly efficiency of the wind wheel 300 can be significantly improved and the connection reliability of the wind wheel 300 can be ensured. Furthermore, the integrally formed structure has higher overall strength and stability, facilitates easier assembly, and prolongs the service life of the electrical fan.
It can be understood that, referring to
It can be understood that, referring to
In addition, the ratio range of the maximum width of the second fan blades 310 to the minimum width of the second fan blades 310 is 1.3 to 2.1. For example, the ratio of the maximum width of the second fan blades 310 to the minimum width of the second fan blades 310 may be 1.3, 1.5, 1.8, 2.0, 2.1, etc., so as to reduce the impact of the second fan blades 310 in the air inlet channel on the air flowing out of the air inlet channel while increasing the contact area between the second fan blades 310 and the air, and meanwhile, to reduce aerodynamic noise, and improve the performance of the air inlet channel.
It can be understood that, referring to
It can be understood that the number of the first fan blades 410 is z1, the number of the second fan blades 310 is 22, and z1>22, that is, the number of the first fan blades 410 is greater than the number of the second fan blades 310. When the wind wheel 300 rotates, the air is divided into a plurality of airflows and sent to the first diffusing channel 102, when the number of the first fan blades 410 is greater than the number of the second fan blades 310, the plurality of airflows entering the first diffusing channel 102 will be further divided into more airflows, which will help to reduce the pulsation of the airflow and reduce noise.
It can be understood that, referring to
In addition, referring to
It can be understood that, referring to
It can also be understood that, referring to
In addition, referring to
It can be understood that the number of the first fan blades z1, the number of the third fan blades z3, and z3>21, that is, the number of the third fan blades 510 is greater than the number of the first fan blades 410. When the number of the third fan blades 510 is greater than the number of the first fan blades 410, the airflow flowing out from the outlet end of the first diffusing channel 102 can be divided into a plurality of airflows, which is beneficial for reducing airflow pulsation and reducing noise, and at the same time, can further decelerate and expand the airflow in the second diffusing channel 103.
It can be understood that, referring to
It can be understood that the second diffuser 500 is provided with a plurality of bosses 540 in a protruding manner along the axial direction, and the plurality of bosses 540 fit to position a PCB. By inserting screws through positioning holes in the PCB and threading same with the bosses 540, the PCB is fixedly mounted into the housing assembly.
According to an embodiment of the second aspect of the present disclosure, the cleaning device includes the fan according to the embodiment of the first aspect of the present disclosure. When the wind wheel 300 rotates, the air enters the air inlet channel, and when the airflow transitions from the air inlet channel 101 to the first diffusing channel 102, after passing through the first fan blades 410, the airflow enters the diffusing channel 102 more smoothly, thereby reducing the diffusion and impact loss of air flow and reducing aerodynamic noise.
It is understood that the cleaning device may be a handheld vacuum cleaner, a bucket vacuum cleaner, a sweeping robot, or other types of cleaning devices. When the cleaning device is the handheld vacuum cleaner, it requires the electric fan to be small in size and high in power to meet the cleaning needs. While the motor maintains high power, the noise can be effectively reduced, and the troubles of the noise generated by the cleaning device on the user can be reduced, thereby improving the user experience.
The embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings, however, the present disclosure is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various modifications can be made without departing from the purpose of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202111547204.3 | Dec 2021 | CN | national |
| 202123197264.5 | Dec 2021 | CN | national |
This application is a continuation of International Application No. PCT/CN2022/079376 filed on Mar. 4, 2022, which claims priority to and benefits of Chinese Patent Application No. 202111547204.3 filed on Dec. 16, 2021 and Chinese Patent Application No. 202123197264.5 filed on Dec. 16, 2021, the entire contents of each of which are incorporated herein by reference for all purposes. No new matter has been introduced.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2022/079376 | Mar 2022 | WO |
| Child | 18666187 | US |
