FAN MODULE, MAIN DRIVE MODULE AND FOLDABLE HANDHELD FAN USING THE SAME

Abstract

The present invention relates to the technical field of small household electrical appliances and discloses a fan module, a main drive module and a foldable handheld fan using the same, wherein the fan module comprises a motor shell assembly, a fan blade assembly and a motor; and the motor is accommodated in the motor shell assembly, a rotating shaft of the motor penetrates from the motor shell assembly, and the fan blade assembly is sleeved on the rotating shaft of the motor, so that the motor drives the fan blade assembly to rotate, and a low-noise air inlet space is formed between the fan blade assembly and the motor shell assembly.

Description

TECHNICAL FIELD

The present invention relates to the technical field of small household electrical appliances, in particular to a fan module, a main drive module, a foldable handheld fan, and handheld fan.

BACKGROUND TECHNOLOGY

With the development of battery technology, motor miniaturization technology, circuit integration technology, mold precision technology and other related industrial technologies, it is possible to miniaturize some household appliances; among them, various forms of foldable handheld fans, such as handheld fans, outdoor fans, foldable fans and hanging neck fans are an important manifestation of the miniaturization of household appliances.

Foldable handheld fans, an important category of handheld fans can be stored in pockets or backpacks, occupying very little space after being folded.

However, foldable handheld fans in the prior art still have at least following technical problems:

• • I. Foldable handheld fans in the prior art require fan blades made of flexible materials with small thickness so as to achieve foldable fan blades, resulting in thin blades that are unable to generate strong airflow. Additionally, in order for small size, foldable handheld fan in the prior art usually do not have good airflow channel, for instance, structural elements near fan blades obstruct the airflow, leading to turbulence and affecting normal operation of airflow channel.
  • II. Foldable handheld fans in the existing technology often only have the function of blowing out air, and a small number of these fans have aromatic modules (such as aromatic slices or pads embedded in air outlet grille) for aromatherapy functions, or some also incorporate LED beads into fans' shells to offer basic lighting (however, due to limitations in voltage and power of foldable handheld fans, lighting capability thereof is relatively limited).
  • III. Foldable handheld fans in the existing technology often comprise irrational mechanical structures of main drive module. For example, some foldable handheld fans comprise oversized shells for main drive modules to ensure a certain grip feel, resulting in numerous cavities within shells, which not only reduces space utilization and affects the miniaturization of foldable handheld fans, but also leads to issues such as shaking or dislocation of main control circuit boards and batteries; and some other foldable handheld fans, in order to reduce volumes of shells for a more compact size, and then sacrifice performance of main control circuit boards and battery capacity.

In summary, addressing how to provide good fluid dynamics performance for foldable handheld fans, optimizing their multi-functionality, and rationalizing the design of main drive module structures are urgent problems that need to be solved.

SUMMARY OF THE INVENTION

The present invention aims to provides a fan module, a main drive module, a foldable handheld fan and a handheld fan so as to good fluid dynamics performance for foldable handheld fans, optimize multi-functionality thereof, and offer a reasonable main drive module structure for foldable handheld fans.

In order to achieve above purposes, the present invention provides following technical solutions: a fan module, comprising a motor shell assembly, a fan blade assembly and a motor, wherein the motor is accommodated in the motor shell assembly, a rotating shaft of the motor penetrates from the motor shell assembly, and the fan blade assembly is sleeved on the rotating shaft of the motor, so that the motor drives the fan blade assembly to rotate; and a low-noise air inlet space is formed between the fan blade assembly and the motor shell assembly.

A main drive module comprises a main shell assembly, a circuit board, and a battery, wherein inside the main shell assembly comprises a main accommodation space, and at least one portion of the main shell assembly protrudes to form a step portion, thereby forming an expanded accommodation space inside the step portion; and both the circuit board and the battery are accommodated in the main accommodation space and the expanded accommodation space of the main shell assembly.

A foldable handheld fan comprises the main drive module as mentioned above, wherein the foldable handheld fan further comprises a fan module and a storage shell; the fan module comprises a motor shell assembly, a fan blade assembly and a motor; the motor is accommodated in the motor shell assembly, a rotating shaft of the motor penetrates from the motor shell assembly, and the fan blade assembly is sleeved on the rotating shaft of the motor, so that the motor drives the fan blade assembly to rotate; the motor shell assembly of the fan module is pivotally connected to the main drive module, so as to enable the motor shell assembly and the fan blade assembly to swing in a pitch angle and/or left and right angles relative to the main drive module; and the main drive module is pivotally connected to the storage shell, so as to enable at least one portion of the main drive module, at least one portion of the motor shell assembly, and/or at least one portion of the fan blade assembly to be folded and stored in a storage cavity of the storage shell.

Compared with the prior art, the present invention has following beneficial effects: hydrodynamic performance advantages of the fan module and the foldable handheld fan of the present embodiment are at least as follows:

• • I. The motor shell assembly and the fan blade assembly are able to swing at a pitch angle relative to the main shell assembly, so that multi-angle air blowing is achieved, and obstruction of airflow channel at certain blowing angles is avoided.
  • II. There is a minimum distance between fan blade bodies of the fan blade assembly and the motor shell assembly, which prevents the motor shell assembly from affecting the airflow and provides a good air suction duct for the fan blade bodies, thereby ensuring the wind efficiency of the fan blade assembly and reducing operational noise of the fan blade assembly.
  • III. The outer contour of the motor shell assembly is cylindrical, which avoids disrupting airflow, providing a good air intake passage for the fan blade assembly, ensuring its efficiency, and reducing operational noise.

In addition, the fan module in the present embodiment comprises a functional module with display and/or lighting functions. A transparent window on the motor shell assembly aligns with an emitting surface of the functional module, which allows the functional module to display power on/off status, wind speed gear, battery level, advertising messages/greetings, or be used directly for lighting, thereby optimizing multi-functionality of portable fans in existing technologies and providing more extended functions for portable fans.

Furthermore, in the main drive module of the present invention, inside the main shell assembly thereof comprises a main accommodation space, and a protruded step portion formed on the main shell assembly to create an expanded accommodation space for accommodating a circuit board in the expanded accommodation space, so that main accommodation space is able to accommodate the battery, thereby obtaining a larger capacity of the battery and improving endurance of portable fans. Additionally, the circuit board placed in the expanded space is able to equip with different types of charging interfaces, enabling portable fans to adapt to a wider range of power line interfaces. The compact and rational mechanical structure of the main drive module in the present invention provides a good accommodating structure for the circuit board and the battery.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a first perspective view of a fan module of the present invention;

FIG. 2 is a second perspective view of the fan module of the present invention;

FIG. 3 is an exploded view of the fan module of the present invention;

FIG. 4 is a cross-sectional view of the fan module of the present invention;

FIG. 5 is a perspective view of a main drive module of the present invention;

FIG. 6 is an exploded view of the main drive module of the present invention;

FIG. 7 is a cross-sectional view of the main drive module of the present invention;

FIG. 8 is a perspective view of a foldable handheld fan in a folded state in the present invention;

FIG. 9 is a first perspective view of the foldable handheld fan in an unfolded state in the present invention;

FIG. 10 is a second perspective view of the foldable handheld fan in an unfolded state in the present invention;

FIG. 11 is an exploded view of the foldable handheld fan in the present invention;

FIG. 12 is a perspective view of the handheld fan in a storage state of the present invention;

FIG. 13 is a perspective view of the handheld fan in an expanded state of the present invention;

FIG. 14 is a second perspective view of the handheld fan in an expanded state of the present invention; and

FIG. 15 is an exploded view of the handheld fan in the present invention.

The markups in the drawings are indicated as follows:

• • 1—motor shell assembly;
  • 11—light-transmitting window;
  • 111—flat surface;
  • 112—convex surface;
  • 12—window support frame;
  • 13—front motor shell;
  • 14—rear motor shell;
  • 15—pivot arm;
  • 16—first pivot shaft;
  • 2—fan blade assembly;
  • 21—fan blade base;
  • 22—fan blade cover;
  • 221—fan blade pivot;
  • 23—fan blade body;
  • 3—motor;
  • 4—functional module;
  • 41—light-emitting surface;
  • 5—main shell assembly;
  • 51—front main shell;
  • 511—step portion;
  • 52—rear main shell;
  • 53—first pivot slot;
  • 54—button;
  • 55—second pivot slot;
  • 56—light-transmitting component;
  • 6—circuit board;
  • 61—switch;
  • 62—first charging interface;
  • 63—second charging interface;
  • 64—indicator light;
  • 7—battery;
  • 8—storage shell;
  • 81—storage cavity;
  • 82—buckle interface;
  • 10—main accommodation space; and
  • 20—expanded accommodation space.

SPECIFIC EMBODIMENTS

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within protection scope of the present invention.

An embodiment of the present invention provides a fan module which is used to provide an air outlet function and has good hydrodynamic performance. In addition, the fan module also provides a display/illumination function.

Please refer to FIGS. 1-4, the fan module of the present embodiment comprises a motor shell assembly 1, a fan blade assembly 2 and a motor 3.

It should be noted that the motor 3 is a small motor driven by direct current.

The motor 3 is accommodated in the motor shell assembly 1, a rotating shaft of the motor 3 penetrates from the motor shell assembly 1, and the fan blade assembly 2 is sleeved on the rotating shaft of the motor 3, so that the motor 3 drives the fan blade assembly 2 to rotate; and in order to obtain good hydrodynamic performance, a low-noise air inlet space is formed between the fan blade assembly 2 and the motor shell assembly 1 so that a good air suction channel for the fan blade assembly 2 is provided to ensure the air efficiency of the fan blade assembly 2 and reduce operating noise of the fan blade assembly 2.

Specifically, the fan blade assembly 2 comprises a fan blade base 21, a fan blade cover 22 and a plurality of fan blade bodies 23, wherein the blade base 21 is a strip-shaped base work piece made of engineering plastic, the blade surface cover 22 is a cover plate made of engineering plastic or metal, the plurality of blade bodies 23 are blade shaped work pieces made of flexible materials such as silicone or rubber, and in the present embodiment a quantity of the plurality of blade bodies 23 is two; the fan blade cover 22 is provided with fan blade pivots 221 along a circumferential direction which corresponds in quantity to the plurality of fan blade bodies 23, the fan blade pivots 221 and the fan blade cover 22 are integrally formed, in the present embodiment a quantity of the fan blade pivots 221 is arranged to be two; free end portions of the fan blade pivots 221 of the fan blade cover 22 are fixed on the fan blade base 21 (which may be achieved through interference fit or snap fit), so as to make the fan blade cover 22 and the fan blade base 21 are fixed to each other, and the plurality of fan blade bodies 23 are correspondingly pivotally connected to the fan blade pivots 221, actually the fan blade pivots 221 penetrate from through holes on the plurality of fan blade bodies 23 and then are fixed on the fan blade base 21, thereby realizing pivot connection of the fan blade body 23; the rotating shaft of the motor 3 penetrates from the fan blade base 21 and connects to the fan blade cover 22, which actually are in interference fit or bonded; when the fan blade base 21 and the fan blade cover 22 rotate, the plurality of fan blade bodies 23 are expanded by a centrifugal force, so as to realize an air blowing function, and when the fan blade base 21 and the fan blade cover 22 are stationary, the plurality of fan blade bodies 23 are able to be stowed away, thereby facilitating the storage of the fan blade body 23.

Specifically, a minimum distance L between the plurality of blade bodies 23 of the fan blade assembly 2 and the motor shell assembly 1 is 2 mm to 5.5 mm (i.e. L=2 mm-5.5 mm) to form a low-noise air inlet space, specifically, a distance between a most protruding position of the plurality of fan blade bodies 23 and a surface of the motor shell assembly 1 is the minimum distance L, and in the present embodiment, L=2.5 mm; and when the plurality of fan blade bodies move, a large amount of air from a direction of the motor shell assembly 1 is absorbed, thereby forming airflow, maintaining a certain minimum distance L between the plurality of fan blade bodies 23 and the motor shell assembly 1 prevents the motor shell assembly 1 from affecting the airflow and provides a good air suction channel for the plurality of fan blade bodies 23.

Further, in order to achieve display/lighting functions, the fan module of the present embodiment further comprises a functional module 4 with display and/or lighting functions, and the functional module 4 is also accommodated in the motor shell assembly 1; on the motor shell assembly 1 is penetrated a light-transmitting window 11 which is at a position not blocked by the fan blade assembly 2, and the light-transmitting window 11 is aligned with a light-emitting surface 41 of the functional module 4.

Further, the functional module 4 comprises one of an LED display screen (used to display power on/off status, wind speed gear, battery level, advertising slogans/greetings, etc.), an LCD display screen (especially an LCD display with backlight, which is also used to display information such as power on and off status, wind speed gear, battery level, advertising slogans/greetings, etc.), a lighting module (such as circuit boards equipped with LED lamp beads, used for lighting), a light-emitting graphic and text module (for example, a light-emitting module printed with fixed graphic and text information, used to display advertising slogans/greetings and other information).

Specifically, the motor shell assembly 1 includes a front motor shell 13 and a rear motor shell 14, the front motor shell 13 and the rear motor shell 14 are half shell bodies made of engineering plastic which are interlocked or fastened together by screws; both the motor 3 and the functional module 4 are accommodated between the front motor shell 13 and the rear motor shell 14, specifically the motor 3 and the functional module 4 are completely fixed through clamping positions or fixing posts; and the rotating shaft of the motor 3 penetrates from the front motor shell 13, and the light-transmitting window 14 is penetrated on the rear motor shell.

Further, the motor shell assembly 1 further comprises a window support frame 12, the window support frame 12 is a cylindrical engineering plastic component used to support and fix the light-transmitting window 11, the light-transmitting window 11 is penetrated and fixed in the window support frame 12, in the present embodiment, one side of the light-transmitting window 11 is fixed on fixing ribs arranged radially inward on the window support frame 12 through adhesive, the window support frame 12 is penetrated and fixed on the rear motor shell 14. In the present embodiment, the window support frame 12 is fixedly buckled onto the rear motor shell 14 through buckles.

Further, the light-transmitting window 11 comprises one of a transparent window (such as transparent glass or transparent polymer material plate for full light transmission display or lighting), a translucent window (such as tawny/frosted glass or tawny/frosted polymer material panels are used for semi-transparent displays), a plano-convex lens (for magnifying display and illumination) and a convex lens (for magnifying display and illumination).

In the present embodiment, the light-transmitting window 11 is a plano-convex lens wherein two sides of the light-transmitting window 11 comprise a flat surface 111 and a convex surface 112 respectively, the convex surface 112 of the light-transmitting window 11 and the light-emitting surface 41 of the functional module 4 are aligned with each other, and the flat surface 111 of the light-transmitting window 11 faces outer portions of the motor shell assembly 1, so that display and illumination lights of the functional module 4 are amplified.

Further, outer contours of both the front motor shell 13 and the rear motor shell 14 of the motor shell assembly 1 are cylindrical, that is, the entire motor shell assembly 1 is cylindrical when viewed from the outside; and when the plurality of fan blade bodies move, a large amount of air is absorbed from a direction of the motor shell assembly 1, thereby forming airflow, therefore, the motor shell assembly 1 is set in a cylindrical shape, so that a blocked area behind the fan blade assembly 2 is smaller, and the air can flow smoothly along outer walls of the motor shell assembly 1, thereby preventing the motor shell assembly 1 from affecting the airflow and providing a good air suction duct for the plurality of fan blade bodies 23.

The present embodiment further provides a main drive module, which can be applied to portable fans such as handheld fans, outdoor fans, foldable fans, and neck-hanging fans, and is used to provide a part of a shell structure for portable fans and drive motor operation of portable fans.

Please refer to FIGS. 5-7, the main drive module of the present embodiment comprises a main shell assembly 5, a circuit board 6, and a battery 7, wherein

• • the circuit board 6 is a printed circuit board equipped with a main control, and the battery 7 is a rechargeable lithium battery.

Inside the main shell assembly 5 comprises a main accommodation space 10, and at least one portion of the main shell assembly 5 protrudes to form a step portion 511, thereby forming an expanded accommodation space 20 inside the step portion 511; and both the circuit board 6 and the battery 7 are accommodated in the main accommodation space 10 and the expanded accommodation space 20 of the main shell assembly 5.

Actually, both the circuit board 6 and the battery 7 are secured to the main shell assembly 5 by means of adhesive brackets, buckles or screws.

Specifically, the circuit board 6 is accommodated in the expanded accommodation space 20 of the main shell assembly 5, and the battery 7 is accommodated in the main accommodation space 10 of the main shell assembly 5.

Actually, a circuit board 6 of a portable fan is only used to drive the motor to operate and perform a small number of auxiliary functions, so components needed to be equipped with are limited, and the circuit board 6 is accommodated in the expanded accommodation space 20 of the main shell assembly 5, so that the battery can be accommodated in the entire main accommodation space 10, thereby obtaining a larger battery capacity and improving the battery life of the portable fan.

Specifically, the main shell assembly 5 comprises a front main body shell 51 and a rear main body shell 52 which are combined with each other, both the front main body shell 51 and the rear main body shell 52 are half shell bodies made of engineering plastic, and are fastened to each other or locked into one through screws; and the step portion 511 is provided on the front main body shell 51, namely, the step portion 511 and the front main body shell 51 are integrally injection molded.

Further, a thickness of the main shell assembly 5 is represented by H1 and a thickness of the step portion 511 is represented by H2; and H1: H2=0.55-0.65; with such ratio set, an upper end portion of the front main body shell 51 provides ample lateral storage space for the blade assembly of the portable fan, and allows the circuit board 6 to be equipped with more types of charging interfaces.

Further, a length of the main shell assembly is represented by L1, and a length of the step portion is represented by L2; and L2: L1=0.35-0.45; with such ratio set, ample longitudinal storage space is made available for the blade assembly of the portable fan at the upper end portion of the front main shell 51.

Further, specifically, on the circuit board 6 are equipped switches 61, the switches 61 are micro switches which are mounted on the circuit board 6 in a form of plug-ins; on the step portion 511 of the main shell assembly 5 are embedded buttons 54 aligning with the switches 61, so that when the buttons 54 are pressed, the switches are triggered 61, thereby realizing functions of turning on and off the portable fan and adjusting the wind power.

Further, specifically, the circuit board 6 is further equipped with a first charging interface 62 and a second charging interface 63 respectively, in the present embodiment, the first charging interface 62 is a Type-C interface, the second charging interface 63 is a USB interface, and both of which are installed on the circuit board 6 in the form of plug-ins; and both the first charging interface 62 and a second charging interface 63 penetrate from the step portion 511 of the main shell assembly 5, so as to enable the portable fan to be adapted to more types of power cable interfaces.

Further, specifically, the circuit board 6 is further provided with an indicator light 64, the indicator light 64 comprises variable-color LED lamp beads, which are mounted on the circuit board 6 in a form of a patch, and on the step portion 511 of the main shell assembly 5 is provided a light-transmitting component 56 aligning with the indicator light 64, the light-transmitting component 56 is a transparent polymer material insert, lights of the indicator light 64 is guided by the light-transmitting component 56 to reach the surface of the main shell assembly 5 to indicate power on and off status of the portable fan, wind speed and battery level, charging status and other information.

The present embodiment further provides a foldable handheld fan, and the foldable handheld fan comprises an unfolded state before being folded and a stored state after being folded.

Please refer to FIGS. 8-11, the foldable handheld fan of the present embodiment comprises the fan module and the main drive module as mentioned above, wherein the foldable handheld fan further comprises a storage shell 8;

In order for further good hydrodynamic performance, the motor shell assembly 1 of the fan module is pivotally connected to the main drive module, so as to the motor shell assembly 1 and the fan blade assembly 2 to swing at a pitch and/or left and right angle relative to the main drive module.

• • the main drive module is pivotally connected to the storage shell 8, so as to enable at least one portion of the main drive module, at least one portion of the motor shell assembly 1, and/or at least one portion of the fan blade assembly 2 to be folded and stored in a storage cavity 81 of the storage shell 8.

When a total length of the main drive module and the motor shell assembly 1 is less than a length of the storage cavity 81 of the storage shell 8, the entire main drive module, motor shell assembly 1 and fan blade assembly 2 are able to be folded and stored in the storage cavity 81 of the storage shell 8; and when a sum of lengths of the main drive module and the motor shell assembly 1 is greater than the length of the storage cavity 81 of the storage shell 8, part portions of the main drive module, the motor shell assembly 1 and the fan blade assembly 2 are able to be folded and stored in the storage cavity 81 of the storage shell 8, and rest portions thereof penetrate from the storage shell 8.

Specifically, in the main drive module, end portions of the front main shell 51 and the rear main shell 52 are provided with second pivot slots 55, in the present embodiment, the second pivot slots 55 are hole-shaped portions opened on both sides of the front main shell 51 and the rear main shell 52, an end portion of the storage shell is provided with a second pivot shaft, and the main shell assembly 5 is pivotally connected to the storage shell through cooperation of the second pivot shaft and the second pivot slot 55.

Specifically, in the fan module, an end portion of the front motor shell 13 and the rear motor shell 14 of the motor shell assembly 1 is provided with a pivot arm 15, a free end portion of the pivot arm is formed with a first pivot shaft 16, actually, both the pivot arm 15 and the first pivot shaft 16 are integrally injection molded with the front motor shell 13 and the rear motor shell 14; a free end portion of the main shell assembly 5 is provided with a first pivot slot 53, specifically, the first pivot slot 53 is a semicircular slot-shaped structure provided inside the front main shell 51 and the rear main shell 52, and the first pivot shaft 16 of the motor shell assembly 1 is pivotally connected in the first pivot slot 53 of the main shell assembly 5, so as to enable the motor shell assembly 1 and the fan blade assembly 2 to swing at a pitch and/or left and right angle. Actually, when the first pivot shaft 16 is a cylindrical shaft, the motor shell assembly 1 and the fan blade assembly 2 can swing in a pitch or left and right angle; and when the first pivot shaft 16 is a ball shaft, the motor shell assembly 1 and the fan blade assembly 2 can swing in pitch angle and left and right angle at the same time.

Further, the storage shell 8 is provided with a buckle interface for connecting a buckle 82, allowing the foldable handheld fan of the present embodiment to have more ways to be ported.

An embodiment of the present invention further provides a handheld fan comprising an expanded state before being folded and a storage state after being folded.

Please refer to FIGS. 12-15, the handheld fan of the present embodiment comprises the fan module and the main drive module as mentioned above.

The motor shell assembly 1 of the fan module is pivotally connected to the main drive module, so as to enable the motor shell assembly 1 and the fan blade assembly 2 to swing in a pitch angle and/or left and right angles relative to the main drive module.

Specifically, in the fan module, an end portion of the front motor shell 13 and the rear motor shell 14 of the motor shell assembly 1 is provided with a pivot arm 15, a free end portion of the pivot arm is formed with a first pivot shaft 16, actually, both the pivot arm 15 and the first pivot shaft 16 are integrally injection molded with the front motor shell 13 and the rear motor shell 14; a free end portion of the main shell assembly 5 is provided with a first pivot slot 53, specifically, the first pivot slot 53 is a semicircular slot-shaped structure provided inside the front main shell 51 and the rear main shell 52, and the first pivot shaft 16 of the motor shell assembly 1 is pivotally connected in the first pivot slot 53 of the main shell assembly 5, so as to enable the motor shell assembly 1 and the fan blade assembly 2 to swing at a pitch and/or left and right angle. Actually, when the first pivot shaft 16 is a cylindrical shaft, the motor shell assembly 1 and the fan blade assembly 2 can swing in a pitch or left and right angle; and when the first pivot shaft 16 is a ball shaft, the motor shell assembly 1 and the fan blade assembly 2 can swing in pitch angle and left and right angle at the same time.

In order to further obtain good fluid mechanical properties, a low-noise air inlet space is formed between the main shell assembly 5 and the fan blade assembly 2.

Specifically, in some possible embodiments, the low-noise air inlet space is formed through changing a volume of the main shell assembly 5 (for example, the main shell assembly 5 is narrowed from both left and right sides, and the left and right sides of the main shell assembly 5 are recessed to form a notch), or in some possible embodiments, the low-noise air inlet space is formed through changing a distance between the main shell assembly 5 and the fan blade assembly 2 (for example, by extending a length of the pivot arm 15 longitudinally, a distance between the main shell assembly 5 and the fan assembly 2 can be changed), or the low-noise air inlet space is formed by adjusting a pitch angle and/or left and right angles of the fan blade assembly.

The fan module and foldable handheld fan of the present embodiment have hydrodynamic performance advantages which are at least as follows:

• • I. The motor shell assembly 1 and the fan blade assembly 2 are able to swing at a pitch angle relative to the main shell assembly 5, so that multi-angle air blowing is achieved, and obstruction of airflow channel at certain blowing angles is avoided.
  • II. There is a minimum distance between the plurality of fan blade bodies 23 of the fan blade assembly 2 and the motor shell assembly, which prevents the motor shell assembly 1 from affecting the airflow and provides a good air suction duct for the plurality of fan blade bodies 23, thereby ensuring the wind efficiency of the fan blade assembly 2 and reducing operational noise of the fan blade assembly 2.
  • III. The outer contour of the motor shell assembly 1 is cylindrical, which can prevent the motor shell assembly 1 from affecting air flow and provide a good air suction duct for the plurality of fan blade bodies 23, thereby ensuring the wind efficiency of the fan blade assembly 2 and reducing the operating noise of the fan blade assembly 2.

In addition, the fan module in the present embodiment comprises a functional module 4 with display and/or lighting functions, wherein the transparent window 11 on the motor shell assembly 1 aligns with the light-emitting surface 41 of the functional module 4, which allows the functional module 4 to display power on/off status, wind speed gear, battery level, advertising messages/greetings, or be used directly for lighting, thereby optimizing multi-functionality of portable fans in the existing technology and providing more extended functions for portable fans.

Furthermore, in the main drive module of the present embodiment, inside the main shell assembly 5 comprises a main accommodation space 10, and a protruded step portion 511 formed on the main shell assembly 5 to create an expanded accommodation space 20 for accommodating the circuit board 6 therein so that the main accommodation space 10 is able to accommodate the battery 7, thereby obtaining a larger capacity of the battery 7 and improving endurance of portable fans. Additionally, the circuit board 6 placed in the expanded accommodation space 20 is able to equip with different types of charging interfaces, enabling portable fans to adapt to a wider range of power line interfaces. The compact and rational mechanical structure of the main drive module in the present embodiment provides a good accommodating structure for the circuit board 6 and the battery 7.

Although some embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principles and spirit of the present invention. The protection scope of the present invention is defined by appended claims and their equivalents.

Claims

1. A fan module, comprising a motor shell assembly, a fan blade assembly and a motor, wherein the motor is accommodated in the motor shell assembly, a rotating shaft of the motor penetrates from the motor shell assembly, and the fan blade assembly is sleeved on the rotating shaft of the motor, so that the motor drives the fan blade assembly to rotate; anda low-noise air inlet space is formed between the fan blade assembly and the motor shell assembly.

2. The fan module according to claim 1, wherein the fan blade assembly comprises a fan blade base, a fan blade cover and a plurality of fan blade bodies; the fan blade cover is provided with fan blade pivots along a circumferential direction which corresponds in quantity to the plurality of fan blade bodies;free end portions of the fan blade pivots of the fan blade cover are fixed on the fan blade base, so as to make the fan blade cover and the fan blade base fixed together, and the plurality of fan blade bodies are correspondingly pivotally connected to the fan blade pivots; andthe rotating shaft of the motor penetrates from the fan blade base and connects to the fan blade cover; when the fan blade base and the fan blade cover rotate, the plurality of fan blade bodies are expanded by a centrifugal force, and when the fan blade base and the fan blade cover are stationary, the plurality of fan blade bodies are able to be stowed away.

3. The fan module according to claim 1, wherein a minimum distance L between the plurality of blade bodies of the fan blade assembly and the motor shell assembly is 2 mm to 5.5 mm to form a low-noise air inlet space.

4. The fan module according to claim 1 further comprising a functional module with display and/or lighting functions, and the functional module is also accommodated in the motor shell assembly; on the motor shell assembly is penetrated a light-transmitting window which is at a position not blocked by the fan blade assembly, and the light-transmitting window is aligned with a light-emitting surface of the functional module.

5. The fan module according to claim 4, wherein the motor shell assembly includes a front motor shell and a rear motor shell which are combined with each other; the motor and the functional module are accommodated between the front motor shell and the rear motor shell; and the rotating shaft of the motor penetrates from the front motor shell, and the light-transmitting window is penetrated on the rear motor shell.

6. The fan module according to any of claim 5, wherein the motor shell assembly further comprises a window support frame, the light-transmitting window penetrates and is fixed in the window support frame, and the window support frame penetrates and is fixed on the rear motor shell.

7. The fan module according to claim 4, wherein the light-transmitting window comprises one of a transparent window, a translucent window, a plano-convex lens and a convex lens.

8. The fan module according to claim 7, wherein two sides of the light-transmitting window comprise a flat surface and a convex surface respectively, the convex surface of the light-transmitting window and the light-emitting surface of the functional module are aligned with each other, and the flat surface of the light-transmitting window faces outer portions of the motor shell assembly.

9. The fan module according to claim 4, wherein the functional module comprises one of an LED display screen, an LCD display screen, a lighting module and a luminous graphic and text module.

10. The fan module according to claim 5, wherein outer contours of both the front motor shell and the rear motor shell of the motor shell assembly are cylindrical.

11. A main drive module, comprising a main shell assembly, a circuit board, and a battery, wherein inside the main shell assembly comprises a main accommodation space, and at least one portion of the main shell assembly protrudes to form a step portion, thereby forming an expanded accommodation space inside the step portion; andboth the circuit board and the battery are accommodated in the main accommodation space and the expanded accommodation space of the main shell assembly.

12. The main drive module according to claim 11, wherein the circuit board is accommodated in the expanded accommodation space of the main shell assembly, and the battery is accommodated in the main accommodation space of the main shell assembly.

13. The main drive module according to claim 11, wherein the main shell assembly comprises a front main body shell and a rear main body shell which are combined with each other; and the step portion is provided on the front main body shell.

14. The main drive module according to claim 13, wherein a thickness of the main shell assembly is represented by H1 and a thickness of the step portion is represented by H2; and H1: H2=0.55-0.65.

15. The main drive module according to claim 13, wherein a length of the main shell assembly is represented by L1, and a length of the step portion is represented by L2; and L2: L1=0.35-0.45.

16. The main drive module according to claim 11, wherein on the circuit board are equipped switches, on the step portion of the main shell assembly are embedded buttons aligning with the switches, so that when the buttons are pressed, the switches are triggered.

17. The main drive module according to claim 11, wherein the circuit board is further equipped with a first charging interface and a second charging interface respectively; and both the first charging interface and a second charging interface penetrate from the step portion of the main shell assembly.

18. A foldable handheld fan comprising the main drive module according to claim 11, wherein the foldable handheld fan further comprises a fan module and a storage shell; the fan module comprises a motor shell assembly, a fan blade assembly and a motor;the motor is accommodated in the motor shell assembly, a rotating shaft of the motor penetrates from the motor shell assembly, and the fan blade assembly is sleeved on the rotating shaft of the motor, so that the motor drives the fan blade assembly to rotate;the motor shell assembly of the fan module is pivotally connected to the main drive module, so as to enable the motor shell assembly and the fan blade assembly to swing in a pitch angle and/or left and right angles relative to the main drive module; andthe main drive module is pivotally connected to the storage shell, so as to enable at least one portion of the main drive module, at least one portion of the motor shell assembly, and/or at least one portion of the fan blade assembly to be folded and stored in a storage cavity of the storage shell.

19. A handheld fan, comprising the main drive module according to claim 11 and a fan module, wherein the fan module comprises a motor shell assembly, a fan blade assembly and a motor; the motor is accommodated in the motor shell assembly, a rotating shaft of the motor penetrates from the motor shell assembly, and the fan blade assembly is sleeved on the rotating shaft of the motor, so that the motor drives the fan blade assembly to rotate;the motor shell assembly of the fan module is pivotally connected to the main drive module, so as to enable the motor shell assembly and the fan blade assembly to swing in a pitch angle and/or left and right angles relative to the main drive module; anda low-noise air inlet space is formed between the main drive module and the fan blade assembly.

20. The handheld fan according to claim 19, wherein the low-noise air inlet space is formed through changing a volume of the main shell assembly, or changing a distance between the main shell assembly and the fan blade assembly, or adjusting a pitch angle and/or left and right angles of the fan blade assembly.