CN221957829U - Hand-held fan - Google Patents

Abstract

The utility model discloses a handheld fan, including a handle, a circuit board, a key switch, a rotary encoder and a control assembly. A mounting cavity is formed in the handle, and a revealing port communicating with the mounting cavity is provided on the handle; the circuit board is provided in the mounting cavity; the key switch is provided on the circuit board, and the key switch includes a pressure-bearing part and a spring sheet, and the pressure-bearing part can trigger or disconnect the switch control circuit of the circuit board when under pressure, and the spring sheet is transmission-connected with the pressure-bearing part to drive the pressure-bearing part to move and reset; the rotary encoder is provided on the circuit board and connected to the circuit board; the control assembly includes a rolling element and a shaft body, a part of the rolling element is provided in the mounting cavity, another part of the rolling element is exposed outside the handle through the revealing port, a part of the rolling element located in the mounting cavity is connected to the shaft body, a part of the shaft body is provided on the side of the pressure-bearing part facing away from the circuit board, and another part of the shaft body is connected to the rotary encoder. The technical solution of the utility model can realize fine wind speed regulation.

Description

Handheld fan

Technical Field

The utility model relates to the technical field of handheld fans, in particular to a handheld fan.

Background Art

As a small portable fan, handheld fans are widely used in various occasions, bringing convenience to people's lives.

However, existing handheld fans usually use mechanical buttons to control the wind speed. This adjustment method has some limitations. For example, the fan's wind speed adjustment range is limited and can generally only be selected from a few fixed gears, making it impossible to achieve fine wind speed adjustment. Therefore, improvements need to be made.

Utility Model Content

The main purpose of the utility model is to provide a handheld fan, aiming to solve the technical problem that the handheld fan in the prior art cannot achieve fine wind speed regulation.

To achieve the above-mentioned purpose, the handheld fan proposed by the utility model comprises a handle, a circuit board, a key switch, a rotary encoder and a control assembly, wherein a mounting cavity is formed in the handle, and a revealing opening communicating with the mounting cavity is provided on the handle; the circuit board is arranged in the mounting cavity; the key switch is arranged on the circuit board, and the key switch comprises a pressure-bearing part and a spring sheet, wherein the pressure-bearing part can trigger or disconnect the switch control circuit of the circuit board when being pressed, and the spring sheet is transmission-connected with the pressure-bearing part to drive the pressure-bearing part to move and reset; the rotary encoder is arranged on the circuit board and connected with the wind speed regulating circuit of the circuit board; the control assembly comprises a rolling element and a shaft body, wherein a part of the structure of the rolling element is arranged in the mounting cavity, and another part of the structure of the rolling element is exposed outside the handle through the revealing opening, and a part of the structure of the rolling element located in the mounting cavity is connected to the shaft body, a part of the structure of the shaft body is arranged on a side of the pressure-bearing part facing away from the circuit board, and another part of the structure of the shaft body is connected to the rotary encoder; the rolling element can be pressed and squeeze the pressure-bearing part, and the rolling element can also be rotatably arranged relative to the handle.

In a possible implementation, the rolling element is disposed between the key switch and the rotary encoder;

The shaft body comprises a first rotating shaft and a second rotating shaft, wherein the first rotating shaft is arranged on a side of the rolling element close to the key switch and connected to the rolling element, and a part of the structure of the first rotating shaft is arranged on a side of the pressure receiving portion facing away from the circuit board;

The second rotating shaft is arranged on a side of the rolling element close to the rotary encoder, and is connected to the rolling element and the rotary encoder respectively.

In a possible implementation manner, the axis of the first rotating shaft coincides with the axis of the rolling element, the first rotating shaft extends in the width direction of the handle, and is movably arranged in the thickness direction of the handle to press the pressed portion;

The handheld fan also includes a first limit member, which is arranged in the installation cavity. The first limit member includes two first limit arms, and the two first limit arms are arranged at intervals in the length direction of the handle. The two first limit arms are respectively located on two opposite sides of the first rotating shaft to jointly limit the movement of the first rotating shaft in the length direction of the handle.

In a possible implementation, the first limiting member includes a first connecting arm, the first connecting arm is fixed in the installation cavity, the first connecting arm passes through the circuit board, and the structure on the first connecting arm located on the side of the circuit board facing the first rotating shaft is respectively connected to the two first limiting arms.

In a possible implementation, the handheld fan further includes a second limit member, the second limit member is disposed in the mounting cavity, the second limit member includes two second limit arms, the two second limit arms are spaced apart in the length direction of the handle, and the two second limit arms are respectively located on opposite sides of the second rotating shaft to jointly limit the movement of the first rotating shaft in the length direction of the handle;

The first limiting arm and the second limiting arm are spaced apart in a width direction of the handle.

In a possible implementation, the second position-limiting member includes a second connecting arm, which is fixed in the installation cavity and connected to the two second position-limiting arms respectively;

The second connecting arm is arranged on a side of the first rotating shaft facing away from the circuit board.

In a possible implementation manner, the first rotating shaft, the rolling element and the second rotating shaft are integrally formed.

In a possible implementation, the handle has a front side facing a user, and the exposure opening is arranged through the front side.

In a possible implementation manner, the handheld fan further includes a shielding member, which is arranged in a ring shape and is disposed on a peripheral wall of the exposure opening to reduce a gap between the exposure opening and the rolling member.

In a possible implementation, the shielding member is provided with a speed increase mark and a speed decrease mark, both of which are exposed outside the handle, and the speed increase mark and the speed decrease mark are respectively arranged on opposite sides of the rolling element axis.

The handheld fan of the technical solution of the utility model is provided with a rotatable rolling element on the handle, and the encoder is rotated to detect the position and direction of the shaft connected to the rolling element during the rolling of the rolling element, so as to provide a corresponding output signal to the circuit board. The circuit board can control the rotation rate of the handheld fan according to these output signals to adjust the air output of the handheld fan. Compared with the method of adjusting the speed gear of the fan by pressing a button, the design of the present application allows the user to more flexibly adjust the air volume of the fan to adapt to different environmental requirements, and the rolling element will have obvious physical feedback when rolling, and the user can directly feel the change in speed, which is more intuitive than the button switching mode.

At the same time, the rolling element is configured to be pressed by the user and drive the pressed part of the key switch to move. In this way, the user can press the rolling element to cause the key switch to trigger the switch control circuit, thereby turning on or off the handheld fan. After the rolling element is released, the spring driven rolling element by the key switch moves and resets, so that it is easy for the user to press it next time. When the key switch is pressed, the structure in contact with the switch control circuit will not move due to elastic deformation, thereby ensuring the stability and reliability of the product.

Finally, a handle is designed on the handheld fan for the user to hold, which is convenient for the user to use by hand, so that the use of the product of the present application is not restricted by the scene, and the user can use it anytime and anywhere.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

FIG1 is a schematic structural diagram of an embodiment of a handheld fan of the utility model;

FIG2 is an exploded schematic diagram of FIG1 ;

FIG3 is a partial enlarged view of point A in FIG2;

FIG4 is a schematic structural diagram of FIG2 from another perspective;

FIG. 5 is a partial enlarged view of point B in FIG. 4 .

Description of Figure Numbers:

1. Handle; 11. Installation cavity; 12. Exposure opening; 2. Circuit board; 3. Push switch; 31. Pressure-bearing part; 4. Rotary encoder; 5. Control assembly; 51. Rolling member; 52. Shaft; 521. First rotating shaft; 522. Second rotating shaft; 6. First limiting member; 61. First limiting arm; 62. First connecting arm; 7. Second limiting member; 71. Second limiting arm; 72. Second connecting arm; 8. Shielding member; 81. Speed increase mark; 82. Speed decrease mark; 9. Fan body.

The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and/or" in the full text includes three solutions. Taking A and/or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, which must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

The utility model provides a handheld fan.

In the embodiment of the utility model, as shown in Figures 1 to 5, the handheld fan includes a handle 1, a circuit board 2, a key switch 3, a rotary encoder 4 and a control assembly 5. A mounting cavity 11 is formed in the handle 1, and a revealing opening 12 communicating with the mounting cavity 11 is provided on the handle 1; the circuit board 2 is arranged in the mounting cavity 11; the key switch 3 is arranged on the circuit board 2, and the key switch 3 includes a pressure-bearing portion 31 and a spring. The pressure-bearing portion 31 can trigger or disconnect the switch control circuit of the circuit board 2 when it is pressed, and the spring is connected to the pressure-bearing portion 31 in transmission to drive the pressure-bearing portion 31 to move and reset; the rotary encoder 4 is provided on the circuit board 2 and connected to the wind speed adjustment circuit of the circuit board 2; the control component 5 includes a rolling member 51 and a shaft 52, part of the rolling member 51 is arranged in the installation cavity 11, and the other part of the rolling member 51 is exposed outside the handle 1 through the exposure port 12, the part of the rolling member 51 located in the installation cavity 11 is connected to the shaft 52, part of the shaft 52 is arranged on the side of the pressure-bearing portion 31 facing away from the circuit board 2, and the other part of the shaft 52 is connected to the rotary encoder 4; the rolling member 51 can be pressed and squeeze the pressure-bearing portion 31, and the rolling member 51 can also be rotatably arranged relative to the handle 1.

Specifically, the handheld fan also includes a fan body 9 and a battery and other components. The battery is electrically connected to the fan body 9 and the circuit board 2 and supplies power to them. The fan body 9 is operated or shut down under the control of the circuit board 2, and the rotation speed is changed under the control of the circuit board 2.

A variety of circuits are integrated on the circuit board 2 to achieve different functions. In the present application, the circuit board 2 at least integrates a switch control circuit and a wind speed adjustment circuit. The switch control circuit can be turned on or off by the key switch 3. When turned on, the fan body 9 is powered on and runs. When turned off, the fan body 9 is powered off and stops running. The wind speed adjustment circuit is used to control the motor rotation speed of the fan body 9 to adjust the air output of the fan body 9. Since the above circuit is already a relatively common circuit, its specific structure and operating principle will not be described in detail here.

In the present application, the handle 1 is cylindrical and connected to the fan body 9 for the user to hold for use.

The pressure-receiving portion 31 of the push switch 3 can be pressed by the shaft 52, thereby turning on or off the switch control circuit. In some embodiments, when the pressure-receiving portion 31 is pressed for the first time, the switch control circuit is turned on and the fan body 9 is powered on, and when the pressure-receiving portion 31 is pressed for the second time, the switch control circuit is turned off and the fan body 9 is powered off and stops running. And so on. In some other embodiments, when the pressure-receiving portion 31 is pressed or tapped for a short time (released immediately after pressing), the switch control circuit is turned on and the fan body 9 is powered on, and when the pressure-receiving portion 31 is pressed for a long time, the switch control circuit is turned off and the fan body 9 is powered off and stops running.

Specifically, the key switch 3 includes components such as a key cap, a pressing shaft and a trigger. The key cap is the visible part of the key switch 3, which is usually a shell made of plastic or other materials and is used to provide a pressing surface. The pressure-bearing portion 31 is formed on the key cap, and the pressing shaft is located below the spring and is usually made of plastic or metal. The pressing shaft is a key part connecting the key switch 3 with other components. It enables the key switch 3 to move up and down on a fixed track and come into contact with the trigger (such as a contact on the circuit board 2) when pressed. The trigger is also called a contact or switch, which is an electronic component located at the bottom of the key switch 3. The trigger is connected to the pressing shaft. When the key cap is pressed, the trigger will close or open the switch control circuit.

Compared with the method of using a spring trigger circuit (pressing the spring and moving the spring to a position that can trigger the circuit), the design of the present application triggers the circuit through the key switch 3, which can reduce failures caused by spring failure or poor contact. In addition, since the spring will undergo elastic deformation when being pressed, the use of a spring trigger circuit may result in the spring being unable to accurately move to the preset position to trigger the circuit due to spring deformation, and the stability and reliability are not high.

The rotary encoder 4 is a sensor for measuring rotational motion. The rotary encoder generates corresponding output signals by measuring the position and direction of the shaft 52. The circuit board 2 can receive and process these signals and make corresponding feedback, such as increasing or decreasing the rotation speed of the fan body 9.

The rolling element 51 may be a roller in some embodiments, a spherical body in other embodiments, and an ellipsoid in some other embodiments, and no specific limitation is made herein.

It can be understood that the handheld fan of the technical solution of the utility model, by setting a rotatable rolling member 51 on the handle 1, and detecting the position and direction of the shaft 52 connected to the rolling member 51 by rotating the encoder 4 during the rolling of the rolling member 51, and then providing a corresponding output signal to the circuit board 2. The circuit board 2 can control the rotation rate of the handheld fan according to these output signals to adjust the air output of the handheld fan. Compared with the method of adjusting the speed gear of the fan by pressing a button, the design of the present application allows users to more flexibly adjust the air volume of the fan to adapt to different environmental requirements, and the rolling member 51 will have obvious physical feedback when rolling, and the user can directly feel the change in speed, which is more intuitive than the button switching mode.

At the same time, the rolling element 51 is configured to be pressed by the user and drive the pressed portion 31 of the push switch 3 to move. In this way, the user can press the rolling element 51 to cause the push switch 3 to trigger the switch control circuit, thereby turning on or off the handheld fan. After the rolling element 51 is released, the spring driven rolling element 51 of the push switch 3 moves and resets, so that it is easy for the user to press it next time. When the push switch 3 is pressed, the structure in contact with the switch control circuit will not move due to elastic deformation, thereby ensuring the stability and reliability of the product.

Finally, a handle 1 is designed on the handheld fan for the user to hold, so that the user can use it by hand, so that the use of the product of the present application is not limited by the scene, and the user can use it anytime and anywhere.

The rolling element 51 is disposed between the key switch 3 and the rotary encoder 4;

The rotating shaft includes a first rotating shaft 521 and a second rotating shaft 522. The first rotating shaft 521 is disposed on a side of the rolling element 51 close to the key switch 3 and connected to the rolling element 51. Part of the first rotating shaft 521 is disposed on a side of the pressure receiving portion 31 facing away from the circuit board 2.

The second rotating shaft 522 is disposed on a side of the rolling element 51 close to the rotary encoder 4 and is connected to the rolling element 51 and the rotary encoder 4 respectively.

It is not difficult to understand that by respectively arranging the first rotating shaft 521 and the second rotating shaft 522 on both sides of the rolling element 51, it is possible to avoid imbalance of the overall structure due to excessive load on one side of the rolling element 51, reduce adverse consequences such as friction and vibration caused by imbalance, and improve the stability of the use of the rolling element 51.

Of course, the design of the present application is not limited thereto. In other embodiments, the push switch 3 and the rotary encoder 4 may be disposed on the same side of the rolling element 51 , and the rotating shaft may also be disposed only on the same side of the rolling element 51 .

The axis of the first rotating shaft 521 coincides with the axis of the rolling element 51, and the first rotating shaft 521 extends in the width direction of the handle 1 and is movably arranged in the thickness direction of the handle 1 to press the pressed portion 31; specifically, the axis of the first rotating shaft 521 coincides with the axis of the rolling element 51, so that during the rolling process of the rolling element 51, the first rotating shaft 521 will rotate around its own axis, and the first rotating shaft 521 will not move up and down or left and right in the installation cavity 11 during the rotation process.

The handheld fan also includes a first limit member 6, which is arranged in the installation cavity 11. The first limit member 6 includes two first limit arms 61. The two first limit arms 61 are arranged at intervals in the length direction of the handle 1. The two first limit arms 61 are respectively located on two opposite sides of the first rotating shaft 521 to jointly limit the movement of the first rotating shaft 521 in the length direction of the handle 1.

It is not difficult to understand that by limiting the movement of the first rotating shaft 521 through the two first limiting arms 61 of the first limiting member 6, it is possible to avoid positional displacement of the rolling member 51 and the first rotating shaft 521 in the installation cavity 11 due to the force application process during the pressing of the rolling member 51. At the same time, the presence of the two first limiting arms 61 can also improve the positioning effect during the installation of the first rotating shaft 521, which is beneficial to improving assembly efficiency.

The first position-limiting member 6 includes a first connecting arm 62, which is fixed in the mounting cavity 11, and is disposed through the circuit board 2. The structure of the first connecting arm 62 located on the side of the circuit board 2 facing the first rotating shaft 521 is respectively connected to the two first position-limiting arms 61. It is not difficult to understand that the first connecting arm 62 is fixed on the housing of the handle 1, which is equivalent to a support member of the two first position-limiting arms 61. In addition, since the first connecting arm 62 is disposed through the circuit board 2, it can limit the position of the circuit board 2, including the position stability of the circuit board 2, thereby ensuring the reliability of the key switch 3 on the circuit board 2 and the first rotating shaft 521, and the reliability of the rotary encoder 4 and the second rotating shaft 522.

To further improve the position stability of the first rotating shaft 521, preferably, the handheld fan further includes a second limiting member 7, the second limiting member 7 is disposed in the mounting cavity 11, the second limiting member 7 includes two second limiting arms 71, the two second limiting arms 71 are spaced apart in the length direction of the handle 1, and the two second limiting arms 71 are respectively located on opposite sides of the second rotating shaft 522 to jointly limit the movement of the first rotating shaft 521 in the length direction of the handle 1;

The first limiting arm 61 and the second limiting arm 71 are spaced apart from each other in the width direction of the handle 1 .

The second limiting member 7 includes a second connecting arm 72, which is fixed in the installation cavity 11 and connected to the two second limiting arms 71 respectively;

The second connecting arm 72 is arranged on the side of the first rotating shaft 521 facing away from the circuit board 2. It is easy to understand that the first connecting arm 62 and the second connecting arm 72 cooperate with each other to limit the movement of the first rotating shaft 521 in the thickness direction of the handle 1, so that the first rotating shaft 521 is limited by the two first limiting arms 61 and the two second limiting arms 71 in the length direction of the handle 1, and is limited by the first connecting arm 62 and the second connecting arm 72 in the thickness direction of the handle 1. In the width direction of the handle 1, since the movement of the rolling element 51 is limited by the peripheral wall of the exposure opening 12, the first rotating shaft 521 is also difficult to move in the width direction of the handle 1, thus ensuring the stability of the position of the first rotating shaft 521 in the installation cavity 11.

The first rotating shaft 521, the rolling element 51 and the second rotating shaft 522 are integrally formed. It is not difficult to understand that the first rotating shaft 521, the second rotating shaft 522 and the rolling element 51 are integrally formed, which can reduce the looseness of the connection and improve the stability of the structure. During use, it is not easy to cause problems such as shaking and noise, which improves the comfort of use. In addition, because only the rolling element 51 needs to be removed during disassembly, the first rotating shaft 521 and the second rotating shaft 522 can be removed, and there is no need to disassemble multiple parts to replace the rotating shaft or the rolling element 51, which reduces the difficulty of maintenance.

The handle 1 has a front side facing the user, and the exposure opening 12 is arranged through the front side. It is not difficult to understand that when the user holds the handle 1, the side of the handle 1 close to the user is the front side of the handle 1, so that the rolling element 51 is exposed on the front side, which is convenient for the user to observe and operate the rolling element 51, avoiding operating errors caused by blind operation of the user, and is conducive to improving the user's experience.

The handheld fan further includes a shielding member 8, which is arranged in a ring shape and is arranged on the peripheral wall of the exposure opening 12 to reduce the gap between the exposure opening 12 and the rolling member 51. In specific implementation, the shielding member 8 can be installed on the handle 1 by means of snap connection, plug connection, bonding or screw fixing, and there is no specific limitation on this.

By reducing the gap between the peripheral wall of the exposure opening 12 and the rolling element 51 through the shielding member 8, the probability of dust, water vapor and other impurities entering the installation cavity 11 from the outside of the handle 1 can be effectively reduced, thereby ensuring the operating stability of the components inside the installation cavity 11.

In specific implementation, the shielding member 8 can be made of flexible materials, such as rubber, silicone and the like, or can be made of hard materials, such as plastic, metal and the like, and no specific limitation is made here.

The shielding member 8 is provided with a speed increase mark 81 and a speed decrease mark 82 , both of which are exposed outside the handle 1 , and the speed increase mark 81 and the speed decrease mark 82 are respectively arranged on two opposite sides of the axis of the rolling member 51 .

In specific implementation, in some embodiments, the speed increase mark 81 can be a symbol mark "+", and the speed decrease mark 82 can be a symbol mark "-", in other embodiments, the speed increase mark 81 can be a text mark "plus", and the speed decrease mark 82 can be a text mark "minus", in some other embodiments, color marks can also be used as marks, and no specific restrictions are made here.

The rotation speed increase mark 81 and the rotation speed decrease mark 82 allow the user to quickly identify the fan rotation that is increased or decreased, thereby eliminating the cost of trial and error for the user and improving the user's experience.

The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly/indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A handheld fan, comprising: A handle (1) having a mounting cavity (11) formed therein, and a revealing opening (12) communicating with the mounting cavity (11) being provided on the handle (1); A circuit board (2) is arranged in the installation cavity (11); A key switch (3) is arranged on the circuit board (2), the key switch (3) comprising a pressure-receiving portion (31) and a spring sheet, the pressure-receiving portion (31) can trigger or disconnect the switch control circuit of the circuit board (2) when being pressed, and the spring sheet is in transmission connection with the pressure-receiving portion (31) to drive the pressure-receiving portion (31) to move and reset; A rotary encoder (4) is disposed on the circuit board (2) and connected to a wind speed regulating circuit of the circuit board (2); A control assembly (5), comprising a rolling element (51) and a shaft (52), wherein a portion of the rolling element (51) is arranged in the installation cavity (11), and another portion of the rolling element (51) is exposed outside the handle (1) through the exposure opening (12); the portion of the rolling element (51) located in the installation cavity (11) is connected to the shaft (52); a portion of the shaft (52) is arranged on a side of the pressure-bearing portion (31) facing away from the circuit board (2), and another portion of the shaft (52) is connected to the rotary encoder (4); The rolling member (51) can be pressed and squeeze the pressed portion (31), and the rolling member (51) can also be rotatably arranged relative to the handle (1). 2. The handheld fan according to claim 1, characterized in that the rolling element (51) is arranged between the key switch (3) and the rotary encoder (4); The shaft body (52) comprises a first rotating shaft (521) and a second rotating shaft (522); the first rotating shaft (521) is arranged on a side of the rolling element (51) close to the key switch (3) and connected to the rolling element (51); a part of the structure of the first rotating shaft (521) is arranged on a side of the pressure-bearing portion (31) facing away from the circuit board (2); The second rotating shaft (522) is arranged on a side of the rolling element (51) close to the rotary encoder (4), and is respectively connected to the rolling element (51) and the rotary encoder (4). 3. The handheld fan according to claim 2, characterized in that the axis of the first rotating shaft (521) coincides with the axis of the rolling element (51), the first rotating shaft (521) extends in the width direction of the handle (1), and is movably arranged in the thickness direction of the handle (1) to press the pressed portion (31); The handheld fan further comprises a first limiting member (6), wherein the first limiting member (6) is arranged in the mounting cavity (11), and the first limiting member (6) comprises two first limiting arms (61), wherein the two first limiting arms (61) are arranged at intervals in the length direction of the handle (1), and the two first limiting arms (61) are respectively located on two opposite sides of the first rotating shaft (521) to jointly limit the movement of the first rotating shaft (521) in the length direction of the handle (1). 4. The handheld fan as described in claim 3 is characterized in that the first limiting member (6) includes a first connecting arm (62), the first connecting arm (62) is fixed in the installation cavity (11), the first connecting arm (62) is arranged through the circuit board (2), and the structure on the first connecting arm (62) located on the side of the circuit board (2) facing the first rotating shaft (521) is respectively connected to the two first limiting arms (61). 5. The handheld fan according to claim 3, characterized in that the handheld fan further comprises a second limiting member (7), the second limiting member (7) being arranged in the mounting cavity (11), the second limiting member (7) comprising two second limiting arms (71), the two second limiting arms (71) being arranged at intervals in the length direction of the handle (1), the two second limiting arms (71) being respectively located on two opposite sides of the second rotating shaft (522) to jointly limit the movement of the first rotating shaft (521) in the length direction of the handle (1); The first limiting arm (61) and the second limiting arm (71) are spaced apart in the width direction of the handle (1). 6. The handheld fan according to claim 5, characterized in that the second limiting member (7) comprises a second connecting arm (72), the second connecting arm (72) is fixed in the mounting cavity (11) and is respectively connected to the two second limiting arms (71); The second connecting arm (72) is arranged on a side of the first rotating shaft (521) facing away from the circuit board (2). 7. The handheld fan according to claim 2, characterized in that the first rotating shaft (521), the rolling element (51) and the second rotating shaft (522) are integrally formed. 8. The handheld fan according to claim 1, characterized in that the handle (1) has a front side facing the user, and the exposure opening (12) is arranged through the front side. 9. The handheld fan according to claim 1 is characterized in that the handheld fan further comprises a shielding member (8), the shielding member (8) is arranged in a ring shape, and the shielding member (8) is arranged on the peripheral wall of the exposure opening (12) to reduce the gap between the exposure opening (12) and the rolling member (51). 10. The handheld fan according to claim 9 is characterized in that a speed increase mark (81) and a speed decrease mark (82) are provided on the shielding member (8), the speed increase mark (81) and the speed decrease mark (82) are both exposed outside the handle (1), and the speed increase mark (81) and the speed decrease mark (82) are respectively arranged on two opposite sides of the axis of the rolling member (51).