A DC brushless motor and a hair dryer using the same

Abstract

The present application relates to the field of motors, and in particular to a brushless DC motor and a hair dryer using the motor. The motor comprises a main body and a driver, wherein the driver comprises a drive board for integrating the drive components for driving the motor, a terminal block for wiring, and a control board for integrating control components. The terminal block is arranged at the stator end of the main body, and the drive board is arranged on the side of the terminal block away from the stator end of the main body. The plane where the drive board is located is arranged parallel to the extension direction of the stator end of the main body toward the terminal block. The drive board is electrically connected to the terminal block and the control board respectively. The present application has the effect of improving the heat dissipation efficiency of the motor drive components in the hair dryer.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular to a brushless DC motor and a hair dryer using the motor. Background Art

[0002] A brushless DC motor consists of an electric motor and a driver. It is a typical mechatronic product, and its application in our lives is increasing. For example, the hair dryers we use in our daily lives.

[0003] However, during the use of the hair dryer, the driver device on the motor will continue to heat up, and when the hair dryer blows out hot air, the temperature of the space inside the hair dryer rises, which further causes the temperature of the motor driver device to rise, and may cause damage to the driver device. However, the heat dissipation efficiency of the motor driver device inside the hair dryer is low, so this situation needs to be further improved. Summary of the Invention

[0004] In order to improve the heat dissipation efficiency of the motor drive components in the hair dryer, the present application provides a brushless DC motor and a hair dryer using the motor.

[0005] In a first aspect, the present application provides a brushless DC motor, which adopts the following technical solution:

[0006] A brushless DC motor comprises a main body and a driver, the driver comprising a drive board for integrating drive components for driving the motor, a terminal block for wiring, and a control board for integrating control components, the terminal block being arranged at the stator end of the main body, the drive board being arranged on a side of the terminal block away from the stator end of the main body, the plane on which the drive board is located being arranged parallel to the extension direction of the stator end of the main body toward the terminal block, and the drive board being electrically connected to the terminal block and the control board, respectively.

[0007] By adopting the above technical solution, during the actual use of the brushless motor of the present application, by integrating the driver's driving device on the driver board and the control components on the control board, on the one hand, the driver board can be pre-set with the driving circuit. Compared with the current high-speed DC brushless motor, there is no need to provide a driving circuit to drive the motor, and it is more convenient to use by electrically connecting to the control board; on the other hand, the driver components are split and installed, and the impact on the control components is relatively low during the heating process of the driver components. The contact surface between all the driver components and the air can also be increased, thereby improving the heat dissipation efficiency of the driver components on the driver board, and the plane where the driver board is located is parallel to the extension direction of the stator end of the main body toward the terminal board. At this time, the driver components set on the driver board are in the blowing wind direction of the equipment, and the equipment itself can be used to dissipate heat for the brushless motor, thereby improving the heat dissipation efficiency of the brushless motor.

[0008] Optionally, an extended mounting section is provided on a side of the driving board facing the wiring board, and a strip groove for embedding the extended mounting section is provided on the wiring board.

[0009] By adopting the above technical solution, in order to assemble the drive plate and the main body, by inserting the extended mounting section on the drive plate into the strip hole, on the one hand, the drive plate and the main body can be fixed, and on the other hand, the plane where the drive plate is located can be kept parallel to the extension direction of the stator end of the main body toward the terminal block.

[0010] Optionally, a first conductive layer is provided on the side of the inner wall of the extended mounting section facing the length direction of the strip groove, and a second conductive layer is provided at a position on the inner wall of the strip groove corresponding to the first conductive layer. When the extended fixing section is embedded in the strip groove, the first conductive layer is electrically connected to the second conductive layer.

[0011] By adopting the above technical solution, after the extended installation section is embedded in the strip hole, the first conductive layers abut against each other, thereby achieving electrical connection between the driving board and the wiring board.

[0012] Optionally, an interface terminal (10) for connecting the driving board to an external circuit is provided on the surface of the driving board.

[0013] By adopting the above technical solution, during the assembly process of the entire brushless motor, the interface terminals welded on the driver board can be used to plug the cable of the control board into the interface terminals, thereby realizing electrical connection between the driver board and the control board.

[0014] In a second aspect, the present application provides a hair dryer, which adopts the following technical solution:

[0015] A hair dryer comprises a shell and a DC brushless motor, the shell comprising an air inlet section, a heating section and an air outlet section arranged in sequence, the motor being arranged between the heating section and the air inlet section, and the drive plate being located on the side of the motor facing the heating section, a fan assembly being provided on the side of the motor facing the air inlet section, and an air guide assembly for directing the wind direction inside the shell toward the drive plate being provided on the inner wall of the shell located between the heating section and the motor.

[0016] By adopting the above technical solution, during the use of the hair dryer, the motor electric fan assembly rotates in the shell, blowing the wind from the air inlet section to the blowing section. Although the driving device on the driving board is in a process of continuous heating, since the plane where the driving board is located is consistent with the wind direction inside the shell, the wind blown from the fan assembly to the air outlet section can flow through the driving device on the driving board, thereby accelerating the heat dissipation efficiency of the driving device on the driving board.

[0017] Optionally, the air guide assembly includes air guide blades obliquely arranged on the inner walls on opposite sides of the shell, and the air guide blades are arranged on the inner wall of the shell parallel to the side of the drive plate where the drive device is integrated.

[0018] By adopting the above technical solution, through the set guide wind, when the wind inside the shell blows onto the air guide plate, since the air guide plate is set at an angle, the wind blown onto the air guide plate can be blown toward the middle of the shell, thereby changing the wind direction and making more wind blow toward the drive plate.

[0019] Optionally, a plurality of magnetic blocks are arranged on the side surface of the air guide plate away from the driving plate and spaced in sequence along the length direction of the air guide plate, and electromagnets are provided on the inner wall of the shell at positions corresponding to the magnetic blocks.

[0020] By adopting the above technical solution, when the temperature sensor detects that the temperature inside the shell has risen and reached a preset threshold, different electromagnets can be controlled to be energized. After the electromagnets are energized, the corresponding magnetic blocks on the air guide plates can be adsorbed, thereby changing the inclination angle of the air guide plates. The larger the angle between the air guide plates and the inner wall of the shell, the more wind can be directed to the drive plate. Therefore, by setting up multiple electromagnets and multiple magnetic blocks, the inclination angle of the air guide plates can also be adjusted when different temperature thresholds are reached, thereby achieving adjustment of the amount of air blown to the drive plate.

[0021] Optionally, the air guide piece is configured to be arc-shaped, and the air guide piece is concavely arced on the side facing the driving plate.

[0022] By adopting the above technical solution, when wind blows onto the air guide piece, by setting the air guide piece to an arc shape, the wind blown onto the air guide piece can be guided onto the driving plate more smoothly.

[0023] Optionally, the guide assembly includes an elastic layer arranged on the inner wall of the shell parallel to the side of the drive plate integrated with the drive device, and an accommodating cavity is formed between the elastic layer and the inner wall of the shell, and the accommodating cavity is provided with preheated and expanded vaporized liquid.

[0024] By adopting the above technical solution, when the internal temperature of the shell rises, the vaporized liquid inside the accommodating cavity slowly vaporizes due to the heat, so that the air pressure inside the accommodating cavity is greater than the air pressure inside the shell, and the elastic layer bulges toward the drive plate. When the wind inside the shell blows toward the air outlet section, the wind is guided by the raised elastic layer and flows toward the drive plate inside the shell, thereby increasing the amount of wind blowing onto the drive plate.

[0025] Optionally, the elastic layer is in an arc shape protruding from the inner wall of the shell, the inner wall of the shell is provided with a limiting arc piece extending along the outer side of the elastic layer, and limiting arc pieces are provided at both ends of the elastic layer.

[0026] By adopting the above technical solution, when the vaporized liquid is heated and vaporized, the limiting arc-shaped piece can limit the protruding direction of the elastic layer, so that the elastic layer protrudes more toward the driving plate, thereby directing more wind toward the driving plate.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] Compared with the current high-speed DC brushless motor, there is no need to provide a drive circuit to drive the motor, and it can be electrically connected to the control board for use, which is more convenient; the contact surface between all driving components and the air can be increased, thereby improving the heat dissipation efficiency of the driving components on the driving board; the device itself can be used to dissipate heat for the brushless motor, thereby improving the heat dissipation efficiency of the brushless motor.

[0029] Therefore, the wind blown from the fan assembly to the air outlet section can flow through the driving components on the driving board, thereby accelerating the heat dissipation efficiency of the driving components on the driving board; the wind direction of the shell and located between the heating section and the motor can be adjusted through the air guide assembly, so that more wind blows to the driving components on the driving board, thereby ensuring the heat dissipation efficiency of the driving components on the driving board. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a brushless DC motor in an embodiment of the present application;

[0031] Figure 2 This is an exploded view of a wiring board and a driver board in a brushless DC motor according to an embodiment of the present application;

[0032] Figure 3 This is a brushless DC motor according to the embodiment of the present application. Figure 2 Enlarged view of part A;

[0033] Figure 4 Part a1 is a structural diagram of the air guide blade of a hair dryer in an embodiment of the present application when the hair dryer is not in use or has just been used;

[0034] Figure 4 Part a2 is a structural diagram of the state of the air guide blade of a hair dryer according to an embodiment of the present application after being used for a period of time;

[0035] Figure 5 Part b1 is a hair dryer according to an embodiment of the present application. Figure 4 Enlarged view of part B1;

[0036] Figure 5Part b2 is a hair dryer according to an embodiment of the present application. Figure 4 Enlarged view of part B2;

[0037] Figure 6 Part c1 is a structural diagram of the elastic layer of a hair dryer according to an embodiment of the present application when the hair dryer is not in use or has just been used;

[0038] Figure 6 Part c2 is a structural diagram of the state of the elastic layer of a hair dryer after being used for a period of time in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 1. Main body; 2. Drive board; 3. Terminal block; 4. Through hole; 5. Extended mounting section; 6. Strip groove; 7. Second conductive layer; 8. Mounting hole; 9. Conductive patch; 10. Interface terminal; 11. Housing; 12. Air inlet section; 13. Heating section; 14. Air outlet section; 15. Fan assembly; 16. Temperature sensor; 17. Air guide plate; 18. Magnetic block; 19. Electromagnet; 20. Elastic layer; 21. Limiting arc plate. DETAILED DESCRIPTION

[0041] The following is a further detailed description of this application.

[0042] In the first aspect, the present application provides a brushless DC motor, referring to Figure 1 and Figure 2 , including a main body 1 and a driver. In the embodiment of the present application, the driver includes a driving board 2 for integrating the driving device of the driving motor, a control board (not shown in the drawing) for integrating the control components, and a terminal board 3 for wiring. The driving circuit of the brushless motor can be pre-set on the driving board 2. During the subsequent use of the motor, there is no need to provide a driving circuit to drive the motor. The terminal board 3 is installed on the stator end of the main body 1.

[0043] Reference Figure 2 and Figure 3 In order to fix the terminal block 3, a plurality of through holes 4 for welding the stator end winding of the main body 1 are opened on the terminal block 3. In the present application, 6 through holes 4 are provided on the terminal block 3. By welding the winding on the terminal block 3, the terminal block 3 and the stator can be fixed; the drive board 2 is fixed on the side of the stator end of the terminal block 3 away from the main body 1, and the control board and the drive board 2 are disassembled and assembled, and the drive board 2 is electrically connected to the terminal block 3 and the control board respectively.

[0044] The driving devices are integrated on the driving board 2, the control components are integrated on the control board, and the driving board 2 and the control board are assembled separately. Therefore, during the heating process of the driving devices, the impact on the control components is relatively low. The contact area between all the driving devices themselves and the air can also be increased, thereby improving the heat dissipation efficiency of the driving devices on the driving board 2.

[0045] In addition, refer to Figure 2 and Figure 3 When the brushless DC motor is used in equipment such as fans and extension units, the wind direction of the equipment is in the extension direction of the brushless motor stator toward the terminal board 3. Therefore, in order to improve the heat dissipation efficiency of the brushless DC motor, the plane where the driver board 2 is located is set parallel to the extension direction of the stator end of the main body 1 toward the terminal board 3. The equipment is used so that the generated wind can dissipate heat for the components on the surface of the driver board 2, which can further improve the heat dissipation efficiency of the motor itself.

[0046] During assembly, refer to Figure 2 and Figure 3 In order to keep the plane of the driving board 2 parallel to the extension direction of the stator end of the main body 1 toward the terminal board 3, an extended mounting section 5 is integrally formed on the side of the driving board 2 facing the terminal board 3, and a strip groove 6 for the extended mounting section 5 to be inserted into the terminal board 3 is opened through the terminal board 3; by inserting the extended mounting section 5 on the driving board 2 into the strip groove 6, the driving board 2 can be fixed in the extension direction of the stator end of the main body 1 toward the terminal board 3.

[0047] Reference Figure 2 and Figure 3 After the driving board 2 is fixed, it is necessary to ensure the electrical connection between the driving board 2 and the terminal board 3. Therefore, a first conductive layer is provided on the side of the inner wall of the extended mounting section 5 facing the length direction of the strip groove 6. At the same time, a second conductive layer 7 is provided on the inner wall of the strip groove 6 at a position corresponding to the first conductive layer. In this embodiment, the second conductive layer 7 is made of conductive silver glue. After the extended fixing section is embedded in the strip groove 6 and the driving board 2 is fixed, the first conductive layer abuts against the second conductive layer 7, thereby establishing the electrical connection between the driving board 2 and the terminal board 3.

[0048] Among them, a mounting hole 8 is opened through the extended mounting section 5, and a conductive patch 9 is welded in the mounting hole 8. In the application embodiment, the first conductive layer is formed by the side of the conductive patch 9 facing the inner wall of the strip groove 6 in the length direction.

[0049] During the use of the brushless motor, it is necessary to ensure the electrical connection between the control board and the driver board 2, so an interface terminal 10 is welded on the surface of the driver board 2, and the interface terminal 10 is electrically connected to the driver board 2; during assembly, the cable on the control board can be plugged into the interface terminal 10, thereby ensuring the overall electrical signal transmission inside the brushless motor.

[0050] The implementation principle of an integrated high-speed DC brushless motor in an embodiment of the present application is as follows: in actual use of the brushless motor of the present application, since the driving device of the driver is integrated on the driving board 2 and the control components are integrated on the control board, and the plane of the driving board 2 is arranged parallel to the extension direction of the stator end of the main body 1 toward the terminal board 3, on the one hand, the driving circuit can be pre-set on the driving board 2. Compared with the current high-speed DC brushless motor, there is no need to provide a driving circuit to drive the motor; on the other hand, the driving device and the control component are installed separately. During the heating process of the driving device, the impact on the control component is relatively low, and the contact surface between all the driving devices themselves and the air can be increased, thereby improving the heat dissipation efficiency of the driving device on the driving board 2. On the other hand, when the brushless motor is used in equipment such as fans and extension units, the wind of the equipment itself can be used to dissipate heat from the components on the driving board 2, thereby further improving the overall heat dissipation efficiency of the brushless motor.

[0051] In the second aspect, the present application provides a hair dryer, referring to Figure 4 and Figure 5 , including a shell 11 and a brushless DC motor, the shell 11 includes an air inlet section 12, a heating section 13 and an air outlet section 14 arranged in sequence, the motor is installed between the heating section 13 and the air inlet section 12, and the drive plate 2 is located on the side of the motor facing the heating section 13, and a fan assembly 15 is installed on the side of the motor facing the air inlet section 12. In the embodiment of the present application, the fan assembly 15 is installed on the fan blades (not shown in the figure) in the air inlet section 12. When the fan blades are driven to rotate by the motor, the wind can be blown from the air inlet section 12 to the air outlet section 14. However, since the length direction of the drive plate 2 is consistent with the wind direction inside the shell 11, the wind blown from the fan assembly 15 to the air outlet section 14 can flow through the drive device on the drive plate 2. At this time, the drive device on the drive plate 2 can be dissipated, thereby accelerating the heat dissipation efficiency of the drive device on the drive plate 2.

[0052] In addition, a temperature sensor 16 is installed on the inner wall of the shell 11, and the temperature sensor 16 is installed between the heating section 13 and the motor. Since the driving device on the driving plate 2 is continuously heated and the temperature will continue to rise during the use of the hair dryer, when it is detected that the temperature inside the shell 11 continues to rise, in order to ensure that the temperature of the driving device of the driving plate 2 will not be too high, an air guide component for directing the wind direction inside the shell 11 to the driving plate 2 is installed on the inner wall of the shell 11 between the heating section 13 and the motor; when it is detected that the temperature of the internal space inside the shell 11 between the heating section 13 and the motor rises, the wind direction of the shell 11 between the heating section 13 and the motor can be adjusted by the air guide component, so that more wind blows to the driving device on the driving plate 2, thereby ensuring the heat dissipation efficiency of the driving device of the driving plate 2.

[0053] In the examples of this application, refer to Figure 4 and Figure 5 The air guide assembly includes air guide blades 17 obliquely arranged on the inner walls of the opposite sides of the shell 11. There are two air guide blades 17, and the air guide blades 17 are installed on the inner wall of the shell 11 parallel to the side of the drive plate 2 where the drive device is integrated; when the wind inside the shell 11 blows onto the air guide blades 17, since the air guide blades 17 are inclined, the wind blown onto the air guide blades 17 can be blown toward the middle of the shell 11, thereby changing the wind direction and making more wind blow toward the drive plate 2.

[0054] Reference Figure 4 and Figure 5 In order to allow the wind blowing onto the air guide piece 17 to be more smoothly guided to the driving plate 2, the air guide piece 17 is set to be arc-shaped, and the air guide piece 17 is concavely curved toward the driving plate 2; at the same time, a plurality of magnetic blocks 18 are installed at intervals on the side of the air guide piece 17 away from the driving plate 2 and along the length direction of the air guide piece 17. In this embodiment, three magnetic blocks 18 are installed, and the magnetic blocks 18 are made of metal blocks. Accordingly, electromagnets 19 are installed on the inner wall of the shell 11 at the positions corresponding to the magnetic blocks 18, and the number of electromagnets 19 is the same as the number of magnetic blocks 18.

[0055] During the use of the hair dryer, when the hair dryer starts to be used, the electromagnet 19 farthest from the motor is energized, and the electromagnet 19 absorbs the magnetic block 18 farthest from the motor, so that the air guide piece 17 can be close to the inner wall of the shell 11; when the temperature sensor 16 detects that the temperature inside the shell 11 has risen to a certain level, the electromagnet 19 farthest from the motor is de-energized, and the middle electromagnet 19 is energized. At this time, the electromagnet 19 farthest from the motor is separated from the magnetic block 18 farthest from the motor, and the middle electromagnet 19 absorbs the middle magnetic block 18, so that the air guide piece 17 can be bent toward the drive plate 2, so that the wind blown on the air guide piece 17 can be blown onto the drive plate 2, thereby dissipating the heat of the drive device of the drive plate 2; as the temperature continues When the temperature rises, only when the electromagnet 19 closest to the motor is energized, the middle electromagnet 19 disengages the middle magnetic block 18, and the electromagnet 19 closest to the motor absorbs the magnetic block 18 closest to the motor. At this time, the angle between the air guide plate 17 and the inner wall of the shell 11 is further increased, and more wind can be directed to the drive plate 2, thereby ensuring the temperature of the driving device on the drive plate 2 when the temperature rises; finally, when the three electromagnets 19 are all powered off, the angle between the air guide plate 17 and the inner wall of the shell 11 is the largest, and the maximum amount of wind can be directed to the drive plate 2 at this time; through the above process, when the internal temperature of the shell 11 reaches different temperature thresholds, the inclination angle of the air guide plate 17 can also be adjusted, thereby realizing the adjustment of the amount of air blown onto the drive plate 2, thereby ensuring the heat dissipation efficiency of the driving device on the drive plate 2.

[0056] In other embodiments of this application, refer to Figure 6 The air guide assembly is installed on the elastic layer 20 on the inner wall of the shell 11 parallel to the driving plate 2 on which the driving device is integrated, and a accommodating cavity is formed between the elastic layer 20 and the inner wall of the shell 11. The accommodating cavity is filled with preheated and expanded vaporized liquid. In this embodiment, the vaporized liquid is perfluorohexanone commonly used in fire protection.

[0057] Reference Figure 6When the internal temperature of the shell 11 rises, the vaporized liquid inside the accommodating chamber slowly vaporizes due to the heat, thereby making the air pressure inside the accommodating chamber greater than the air pressure inside the shell 11, and the elastic layer 20 bulges toward the direction of the driving plate 2. When the wind inside the shell 11 blows toward the air outlet section 14, the wind is guided by the bulged elastic layer 20 and flows toward the driving plate 2 inside the shell 11, thereby increasing the amount of wind blowing onto the driving plate 2. In addition, in order to limit the bulging direction of the elastic layer 20 when the vaporized liquid is heated and vaporized , so that more wind can be directed toward the driving plate 2. The elastic layer 20 is in an arc shape that protrudes from the inner wall of the shell 11. A limiting arc piece 21 is formed on the inner wall of the shell 11 along the outer side of the elastic layer 20, and there are limiting arc pieces 21 at both ends of the elastic layer 20. When the vaporized liquid is heated and vaporized, the limiting arc piece 21 can limit the protruding direction of the elastic layer 20, so that the elastic layer 20 protrudes more toward the driving plate 2, thereby directing more wind to the driving plate 2, thereby improving the heat dissipation efficiency of the driving device on the driving plate 2.

[0058] The implementation principle of a hair dryer in an embodiment of the present application is as follows: during the use of the hair dryer, the motor-driven fan assembly 15 rotates in the shell 11, blowing the wind from the air inlet section 12 to the blowing section. Although the driving device on the driving plate 2 is in a continuous heating process, since the length direction of the driving plate 2 is consistent with the wind direction inside the shell 11, the wind blown from the fan assembly 15 to the air outlet section 14 can flow through the driving device on the driving plate 2, thereby accelerating the heat dissipation efficiency of the driving device on the driving plate 2; when it is detected that the temperature of the internal space inside the shell 11 and between the heating section 13 and the motor rises, the wind direction of the shell 11 and between the heating section 13 and the motor can be adjusted through the air guide assembly, so that more wind is blown to the driving device on the driving plate 2, thereby ensuring the heat dissipation efficiency of the driving device on the driving plate 2.

[0059] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A hair dryer comprising a housing (11) and a brushless DC motor, characterized in that: The brushless DC motor comprises a main body (1) and a driver, the driver comprising a drive board (2) for integrating a drive device for driving the brushless DC motor, a wiring board (3) for wiring, and a control board for integrating control components, the wiring board (3) being arranged at the stator end of the main body (1), the drive board (2) being arranged on a side of the wiring board (3) away from the stator end of the main body (1), the plane where the drive board (2) is located being arranged parallel to the extension direction of the stator end of the main body (1) toward the wiring board (3), and the drive board (2) being electrically connected to the wiring board (3) and the control board respectively; The housing (11) comprises an air inlet section (12), a heating section (13) and an air outlet section (14) which are arranged in sequence; the DC brushless motor is arranged between the heating section (13) and the air inlet section (12); the drive plate (2) is located on the side of the DC brushless motor facing the heating section (13); a fan assembly (15) is provided on the side of the DC brushless motor facing the air inlet section (12); and an air guide assembly for guiding the wind direction inside the housing (11) to the drive plate (2) is provided on the inner wall of the housing (11) between the heating section (13) and the DC brushless motor; The air guide assembly comprises air guide blades (17) obliquely arranged on inner walls on opposite sides of the housing (11), and the air guide blades (17) are arranged on the inner wall of the housing (11) parallel to the side of the drive plate (2) where the drive device is integrated; A plurality of magnetic blocks (18) are sequentially arranged at intervals on a side surface of the air guide plate (17) away from the drive plate (2) and along the length direction of the air guide plate (17). Electromagnets (19) are arranged on the inner wall of the shell (11) at positions corresponding to the magnetic blocks (18). A temperature sensor (16) is arranged on the inner wall of the shell (11). The electromagnet (19) is controlled to be on and off according to the temperature of the inner wall of the shell (11) to control the angle of the air guide plate (17) relative to the drive plate (2), thereby adjusting the amount of air blown toward the drive plate (2).

2. A hair dryer according to claim 1, characterized in that: The air guide piece (17) is configured to be arc-shaped, and the air guide piece (17) is in a concave arc on the side facing the driving plate (2).

3. A hair dryer according to claim 1, characterized in that: The air guide assembly comprises an elastic layer (20) arranged on the inner wall of the housing (11) parallel to the side of the drive plate (2) integrated with the drive device, and an accommodating cavity is formed between the elastic layer (20) and the inner wall of the housing (11), and preheated and expanded vaporized liquid is arranged in the accommodating cavity.

4. A hair dryer according to claim 3, characterized in that: The elastic layer (20) is in an arc shape protruding from the inner wall of the shell (11); the inner wall of the shell (11) is provided with a limiting arc piece (21) extending along the outer side of the elastic layer (20); and the limiting arc piece (21) is provided at both ends of the elastic layer (20).

Images