A hair dryer

Abstract

An embodiment of the present application provides a hair dryer, including: a main body having a first air inlet and a first air outlet, a main control board, a heating component and a fan component electrically connected to the main control board are arranged inside the main body; a distance sensor, the distance sensor is arranged at the end of the first air outlet and electrically connected to the main control board, so that the main control board receives the distance signal detected by the distance sensor and controls the working states of the heating component and the fan component. According to the technical solution provided by the embodiment of the present application, the distance sensor can detect the distance between the first air outlet of the main body and the measured human body, and the main control board can control the working states of the heating component and the fan component according to the distance signal of the distance sensor, effectively improving the intelligence of the hair dryer, effectively realizing the protection of the human body, and being simple and convenient.

Description

Technical Field

[0001] This application relates to the field of mechanical technology, and particularly to a hair dryer. Background Art

[0002] A hair dryer is a small household appliance commonly used in people's daily lives. It generally consists of a hair dryer body and a nozzle. The air flow generated by the hair dryer body can be discharged through the nozzle for users to use.

[0003] Currently, most of the hair dryers in use cannot automatically make corresponding adjustments according to changes in user usage conditions. For example, the temperature and wind speed at the first air outlet of the hair dryer cannot be automatically adjusted, so users need to sense and make corresponding manual adjustments themselves. For example, currently used hair dryers generally use buttons to manually set the wind speed and temperature levels. Regardless of whether there is a user object in front of the first air outlet of the hair dryer and regardless of the distance between the user object and the hair dryer, without manual operation, it can only operate at a fixed air temperature and wind speed level. When the user object feels uncomfortable, they can only move the hair dryer away or manually switch to other levels until they find a suitable air temperature and wind speed level. It is very inconvenient to use and the user experience is poor. Summary of the Invention

[0004] In view of the above problems, this application is proposed to provide a hair dryer that solves the above problems.

[0005] In one embodiment of this application, a hair dryer is provided, including:

[0006] A main body having a first air inlet and a first air outlet, and a main control board, a heating component, and a fan component electrically connected to the main control board are arranged inside the main body;

[0007] A distance sensor arranged at the end of the first air outlet and electrically connected to the main control board, so that the main control board receives the distance signal detected by the distance sensor and controls the working states of the heating component and the fan component.

[0008] Optionally, the distance sensor is connected to the main control board through a distance recognition circuit.

[0009] Optionally, there are at least two distance sensors;

[0010] Each distance sensor is independently electrically connected to the main control board;

[0011] The connection line between every two distance sensors does not pass through the center point of the first air outlet.

[0012] Optionally, the distance sensor includes a transmitting area and a receiving area;

[0013] The line connecting the emission area on each of the distance sensors and the emission area and the reception area on the other distance sensor does not pass through the center point of the first air outlet.

[0014] The line connecting the reception areas on each of the distance sensors and the reception area on the other distance sensor does not pass through the center point of the first air outlet.

[0015] Optionally, a correction circuit is provided on the main control board, and the correction circuit is electrically connected to the distance sensor.

[0016] Optionally, a heat insulation layer is provided on the outer periphery of the distance sensor.

[0017] Optionally, an installation groove is provided at the end of the first air outlet;

[0018] The distance sensor is installed in the installation groove;

[0019] The heat insulation layer is provided between the installation groove and the distance sensor.

[0020] Optionally, a handle is further provided on the main body;

[0021] A control unit is provided on the handle, and the control unit is electrically connected to the main control board.

[0022] Optionally, a temperature sensor is provided inside the main body, and the temperature sensor is electrically connected to the main control board so that the main control board can receive the temperature signal detected by the temperature sensor and control the working states of the heating component and the blower component.

[0023] In addition, optionally, the distance sensor is one or more of an infrared ranging sensor, a radar ranging sensor, or a laser ranging sensor.

[0024] In the technical solution provided by the embodiments of the present application, the distance sensor can detect the distance between the first air outlet of the main body and the measured human body, and the main control board can control the working states of the heating component and the blower component according to the distance signal of the distance sensor, effectively improving the intelligence of the hair dryer, effectively protecting the human body, and being simple and convenient. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Schematic diagram of the sectional exploded structure of a hair dryer provided by an embodiment of the present application;

[0027] Figure 2 Schematic diagram of the sectional structure of a hair dryer provided by an embodiment of the present application;

[0028] Figure 3 Schematic diagram of the structure of the main body provided by an embodiment of the present application;

[0029] Figure 4 Schematic diagram of the structure of the first positioning member provided by an embodiment of the present application;

[0030] Figure 5 Schematic diagram of the structure of the second positioning member provided by an embodiment of the present application;

[0031] Figure 6 Schematic diagram of the structure of the first connecting member provided by an embodiment of the present application;

[0032] Figure 7 Schematic diagram of the sectional structure of the nozzle provided by an embodiment of the present application;

[0033] Figure 8 Schematic diagram of the sectional structure of a hair dryer provided by an embodiment of the present application;

[0034] Figure 9 Schematic diagram of the circuit of a hair dryer provided by an embodiment of the present application;

[0035] Figure 10 Schematic diagram of the bottom view structure of a hair dryer provided by an embodiment of the present application;

[0036] Figure 11 Schematic diagram of the front view structure of a hair dryer provided by an embodiment of the present application;

[0037] Figure 12 Schematic diagram of the front view structure of a hair dryer in another state provided by an embodiment of the present application;

[0038] Figure 13 Schematic diagram of the internal structure of a hair dryer in the prior art;

[0039] Figure 14a Schematic diagram of the section of the hair dryer main body provided by an embodiment of the present application;

[0040] Figure 14b Three-dimensional schematic diagram of the hair dryer main body provided by an embodiment of the present application;

[0041] Figure 15 Schematic diagram of the structure of the heating component in a hair dryer provided by an embodiment of the present application;

[0042] Figure 16 Schematic diagram of a drainage structure provided on a blower assembly in a hair dryer according to an embodiment of the present application;

[0043] Figure 17 Cross-sectional schematic diagram of a hair dryer provided by an embodiment of the present application;

[0044] Figure 18 Exploded assembly schematic diagram of a silencing component in a hair dryer provided by an embodiment of the present application;

[0045] Figure 19 Side view of a hair dryer provided by an embodiment of the present application;

[0046] Figure 20 Rear view of a hair dryer provided by an embodiment of the present application;

[0047] Figure 21 Axonometric view of a hair dryer provided by an embodiment of the present application;

[0048] Figure 22 Exploded assembly schematic diagram of exposed components and an air inlet grille in a hair dryer provided by an embodiment of the present application;

[0049] Figure 23 Internal structure schematic diagram of a hair dryer provided by an embodiment of the present application;

[0050] Figure 24 For Figure 23 Partial enlarged schematic diagram;

[0051] Figure 25 Structure schematic diagram of a hair dryer provided by an embodiment of the present application;

[0052] Figure 26 Cross-sectional structure schematic diagram of a main body provided by an embodiment of the present application;

[0053] Figure 27 For Figure 26 Enlarged schematic diagram at position A in

[0054] Figure 28 Exploded structure schematic diagram of a hair dryer provided by an embodiment of the present application;

[0055] Figure 29 Structure schematic diagram of the front of a light guide body provided by an embodiment of the present application;

[0056] Figure 30 Structure schematic diagram of the back of a light guide body provided by an embodiment of the present application

[0057] Figure 31 Internal structure schematic diagram of the handle of a hair dryer provided by an embodiment of the present application;

[0058] Figure 32 The control schematic diagram of the hair dryer provided by the embodiment of the present application;

[0059] Figure 33 The schematic exploded view of the hair dryer provided by an embodiment of the present application;

[0060] Figure 34 The schematic plan view of the front cover plate provided by an embodiment of the present application;

[0061] Figure 35 The schematic perspective view of the front cover plate provided by an embodiment of the present application;

[0062] Figure 36 The schematic view of the structure after the front cover plate and the air inlet grille are aligned provided by an embodiment of the present application;

[0063] Figure 37 The schematic exploded view of the exposed components provided by an embodiment of the present application;

[0064] Figure 38 The schematic view of the structure of the air inlet grille provided by another embodiment of the present application. Detailed implementation manners

[0065] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

[0066] In some processes described in the specification, claims and the above-mentioned drawings of the present application, a plurality of operations that appear in a specific order are included. These operations may not be executed in the order in which they appear in this article or may be executed in parallel. In addition, these processes may include more or fewer operations, and these operations may be executed in sequence or in parallel. It should be noted that the descriptions such as "first" and "second" in this article are used to distinguish different messages, devices, modules, etc., and do not represent a sequence, nor do they limit that "first" and "second" are of different types.

[0067] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0068] In the prior art, the nozzle of a hair dryer is generally directly fixed to the hair dryer body, or the two are connected by a buckle. In the case of a fixed connection, nozzles with different functions cannot be replaced. In the case of a buckle connection, it is very cumbersome to use. The position of the locking part of the buckle needs to be aligned to achieve locking. Moreover, the locking part of the buckle is prone to wear, resulting in situations such as misalignment during assembly, making the fixing effect worse and the locking effect not very ideal.

[0069] In view of the above problems, the present application provides the following embodiments, a hair dryer and a detachable part, making the disassembly and assembly process of the detachable part very convenient, fast, and accurate during installation.

[0070] Figure 1 It is a schematic exploded sectional view of a hair dryer provided by an embodiment of the present application. Figure 2 It is a schematic sectional view of a hair dryer provided by an embodiment of the present application, as Figure 1 and Figure 2 shown.

[0071] In an embodiment of the present application, a hair dryer is provided, including a main body 10 and a first connecting member 13. Among them, the main body 10 includes a housing, and the housing has a first air inlet 11 and a first air outlet 12. The first connecting member 13 is arranged at the first air outlet 12, and the first connecting member 13 is used for magnetic connection with a detachable part.

[0072] According to the technical solution provided by the embodiment of the present application, the main body 10 is magnetically connected to the detachable part through the first connecting member 13. When disassembling and assembling the detachable part on the main body 10, only the magnetic force between the first connecting member 13 and the detachable part needs to be overcome, without other operations. The magnetic connection between the first connecting member 13 and the detachable part makes the first connecting member 13 not easily worn. After the positions of the first connecting member 13 and the detachable part are aligned, they can be automatically connected, making the disassembly and assembly process of the detachable part very convenient, fast, accurate during installation, and with a good installation effect, facilitating users to replace detachable parts with different functions.

[0073] It should be noted that in this embodiment, the detachable part includes but is not limited to a nozzle. The detachable part can be magnetically connected to the first connecting member 13, or the detachable part includes a detachable body 20 and a second connecting member 21 arranged on the detachable body 20. The second connecting member 21 is magnetically connected to the first connecting member 13. The hair dryer can be a Figure 1 and Figure 2 shown handheld hair dryer, or can include but is not limited to a self - moving cleaning robot with a blowing function, a car vacuum cleaner, an air purifier, etc. Correspondingly, the main body 10 can be a Figure 1 and Figure 2The main body of the handheld hair dryer shown in the figure may also include, but is not limited to, the main body of a self - moving cleaning robot, the main body of a car vacuum cleaner, the main body of an air purifier, etc. There is no specific limitation in the embodiments of the present application. In the above and following embodiments, the hair dryer described is taken as an example of a handheld hair dryer for illustration, which does not constitute an improper limitation of the embodiments of the present application.

[0074] In an implementable embodiment of the present application, refer to Figure 1 , one implementable way of the main body 10 in the embodiments of the present application is that the main body 10 includes a housing. Various functional components of the hair dryer are arranged in the cavity of the housing. A first air inlet 11 and a first air outlet 12 are arranged on the housing. The housing extends approximately longitudinally. The first air inlet 11 is located at the front end of the housing, and the first air outlet 12 is located at the rear end of the housing. The first air inlet 11 and the first air outlet 12 are on the same horizontal plane. Such a design can reduce the loss on the air flow path. The components arranged inside the housing include, but are not limited to, a controller assembly and a heating assembly 50, a fan assembly 60, etc. connected to the controller assembly. Relative to the first air inlet 11 and the first air outlet 12, the fan assembly 60 is closer to the first air inlet 11, and the heating assembly 50 is closer to the first air outlet 12. The fan assembly 60 includes a motor for driving the fan and a fan that generates negative pressure by rotation. The fan assembly is configured to form a negative pressure during operation to suck air into the main body 10 from the first air inlet 11, and after being heated by the heating assembly 50, it is blown out from the first air outlet 12. The main body 10 also includes a handle 40. The user can hold the hair dryer through the handle 40 to blow air. Control buttons connected to the controller assembly are arranged on the handle 40. By using the control buttons, the hair dryer can be controlled to perform different functions. For example, the hair dryer can be controlled to blow air of different sizes. A battery assembly is also arranged inside the handle 40. The battery assembly is connected to the controller assembly and is configured to provide electrical energy for other components. Or the power cord of the hair dryer passes through the handle 40 and is connected to the controller assembly, and the power cord is connected to an external power supply to provide electrical energy for other components. In this embodiment, one implementable way is that the extending direction of the handle 40 is perpendicular to the extending direction of the housing. And one end of the handle 40 is connected to the middle position between the front and rear ends of the housing, so that the entire main body 10 has a T - shaped structure.

[0075] Refer to Figure 1 , Figure 1 The arrows in show an implementable flow path of the air flow of the hair dryer. When the hair dryer is working, the air flow is sucked in from the first air inlet 11, passes through components such as the fan assembly 60 and the heating assembly 50, passes through the first air outlet 12 of the main body 10, and then is discharged through the detachable part.

[0076] In the embodiment of the present application, the first connecting member 13 includes, but is not limited to, a magnet, an iron sheet, or other components made of a magnetically conductive material. When the first connecting member 13 is a magnet, the detachable member can be made of iron material, or the second connecting member 21 on the detachable body 20 includes, but is not limited to, a magnet, an iron sheet, or other components made of a magnetically conductive material. When the first connecting member 13 is an iron sheet or other components made of a magnetically conductive material, the second connecting member 21 is a magnet.

[0077] Further, to facilitate the user to freely adjust the air outlet angle of the detachable member, in the embodiment of the present application, the shape of the first connecting member 13 can be set as an annular structure. After the detachable member is connected to the first connecting member 13, the detachable member can rotate arbitrarily along the plane where the first connecting member 13 is located, so as to adjust the air outlet angle of the detachable member.

[0078] See Figure 3 , in an implementable embodiment of the present application, the first air outlet 12 is an annular structure, and the first connecting member 13 is arranged on the radial inner side of the annular structure. The annular first air outlet can make the blowing range of the air outlet larger, thereby improving the blowing effect of the air outlet. Arranging the first connecting member 13 on the radial inner side of the annular structure enables the first connecting member 13 to magnetically connect the detachable member without affecting the air outlet of the first air outlet 12.

[0079] To better fix the first connecting member 13, in an implementable embodiment of the present application, see Figure 3 , the hair dryer further includes a positioning structure 30. Wherein, the positioning structure 30 is located on the radial inner side of the first air outlet 12, and the positioning structure 30 is connected to the housing through a plurality of connecting ribs 31. There is a gap between the positioning structure 30 and the housing, and the gap forms the annular first air outlet 12. The first connecting member 13 is connected and fixed to the positioning structure 30. An implementable way is that the positioning structure 30, the connecting ribs 31 and the housing are an integrally formed structure, the positioning structure 30 has a recessed portion recessed towards the inside of the housing, and the first connecting member 13 is arranged in the recessed portion. The recessed portion is located on the radial inner side of the annular first air outlet 12, and the first air outlet 12 surrounds the periphery of the positioning structure 30. The first connecting member 13 is located in the recessed portion, and the bottom of the recessed portion is used to connect the first connecting member 13. The detachable member can be inserted into the recessed portion and magnetically connected to the first connecting member 13 through the second connecting member 21.

[0080] Continue to see Figure 3, To better fix the first connecting member 13, a mating structure connected to the first connecting member 13 is provided in the recess. The first connecting member 13 is located within the recess and fixed to the mating structure. In an embodiment of the present application, one possible implementation is that the mating structure can be a bearing platform, and the first connecting member 13 is fixedly connected to the bearing platform. Another possible implementation is that the mating structure is a first step structure 3221. To further facilitate the installation of the first connecting member 13 and limit the position of the first connecting member 13, a second step structure 131 that cooperates with the first step structure 3221 is provided on the first connecting member 13. The first step structure 3221 is snap-connected to the second step structure 131. The position of the second connecting member 21 can be limited by the first step structure 3221 and the second step structure 131, effectively preventing the misalignment of the installation of the first connecting member 13. At the same time, during installation, there is no need to deliberately align the installation position of the first connecting member 13 with the bearing platform, which facilitates the installation of the first connecting member 13.

[0081] Continue to refer to Figure 3 , One possible implementation of the positioning structure 30 is that the positioning structure 30 includes a first positioning member 32 and a second positioning member 33. Among them, the first positioning member 32 has the recess that is recessed towards the inside of the housing. The first positioning member 32 with the recess has a bowl-shaped structure and is located inside the first air outlet 12 of the annular structure. That is to say, the radius of the first positioning member 32 is smaller than the radius of the first air outlet 12. The first positioning member 32 is connected to the housing of the main body 10 through a plurality of connecting ribs 31. The second positioning member 33 is received in the recess, that is, the second positioning member 33 is received inside the bowl-shaped structure and is connected to the first positioning member 32, and the first connecting member 13 located between the first positioning member 32 and the second positioning member 33 is clamped and fixed. To enhance the connection strength of the first connecting member 13, the first connecting member 13 and the first positioning member 32 can also be pre-connected by bonding, snap connection, etc., and then clamped and fixed by the second positioning member 33.

[0082] In a possible embodiment of the present application, refer to Figures 4 to 6 , The bottom of the recess has a positioning portion 323. The second positioning member 33 includes a fixing plate 331 and a connecting column 332 provided on the fixing plate 331. The connecting column 332 is connected to the positioning portion 323, and the fixing plate 331 and the first positioning member 32 form a clamping structure to clamp and fix the first connecting member 13.

[0083] For example, the recessed portion is the mounting groove 321. The mounting groove 321 is recessed towards the inside of the housing. A bearing surface 322 is provided on the groove wall of the mounting groove 321. The bearing surface 322 can be composed of a plurality of protrusions on the groove wall, or the bearing surface 322 is a boss provided around the groove wall. The positioning portion 323 can be one or more. When the positioning portion 323 is one, the positioning portion 323 is provided at the central position of the bottom of the mounting groove 321. When the positioning portion 323 is multiple, the positioning portion 323 is provided at the bottom of the mounting groove 321 and is evenly arranged around the center of the bottom of the mounting groove 321. A screw hole is provided on the positioning portion 323, and the connecting column 332 can be connected to the positioning portion 323 by a screw.

[0084] To further facilitate the installation of the first connecting member 13 and limit the position of the first connecting member 13, refer to Figure 4 and Figure 6 , a first step structure 3221 is provided on the bearing surface 322. A second step structure 131 that cooperates with the first step structure 3221 is provided on the first connecting member 13. The first step structure 3221 is snap-fitted with the second step structure 131. The position of the second connecting member 21 can be limited by the first step structure 3221 and the second step structure 131, effectively preventing the first connecting member 13 from being installed out of position. At the same time, during installation, there is no need to deliberately align the installation position of the first connecting member 13 with the bearing platform, which facilitates the installation of the first connecting member 13.

[0085] Furthermore, to facilitate the installation of the second positioning member 33, refer to Figure 5 , a third step structure 3311 that cooperates with the second step structure 131 is provided on the fixing plate 331. The third step structure 3311 is snap-fitted with the second step structure 131, and the surface of the fixing plate 331 is flush with the surface of the first connecting member 13. The connection position of the second positioning member 33 can be limited by the second step and the third step, effectively preventing the second positioning member 33 from being installed out of position, and at the same time, it also facilitates the installation of the second positioning member 33.

[0086] To prevent the second positioning member 33 from rotating, continue to refer to Figure 4 and Figure 5, in the embodiment of the present application, a positioning groove 3231 is provided on the positioning portion 323, and a limiting notch 3232 is provided on the groove wall of the positioning groove 3231. A limiting strip 3321 is provided on the connecting column 332 and is used in cooperation with the limiting notch 3232. The connecting column 332 extends into the positioning groove 3231 to be connected to the positioning portion 323. The limiting strip 3321 extends into the limiting notch 3232 to prevent the second positioning member 33 from rotating radially. The limiting notch 3232 extends along the axial direction of the installation groove 321. The limiting notch 3232 can be one or more, and the number of the limiting strips 3321 can be the same as or less than the number of the limiting notches 3232. When the connecting column 332 extends into the positioning groove 3231, the connecting column 332 drives the limiting strip 3321 to enter the limiting notch 3232. Under the combined action of the limiting notch 3232 and the limiting strip 3321, the connecting column 332 cannot rotate, so that the second positioning member 33 will not rotate either.

[0087] On the basis of Embodiment 1, the embodiment of the present application further provides a detachable member, and the detachable member in Embodiment 2 can be used in cooperation with the main body 10 in Embodiment 1.

[0088] Specifically, referring to Figure 1 , Figure 2 and Figure 7 , in an embodiment of the present application, a detachable member is provided, including a detachable body 20 and a second connecting member 21. Wherein, the detachable body 20 has a second air inlet and a second air outlet. The second connecting member 21 is arranged at the second air inlet, and the second connecting member 21 is used for magnetic connection with the main body 10 to penetrate the second air inlet and the first air outlet 12 of the main body.

[0089] The technical solution provided by the embodiment of the present application, the detachable member includes but is not limited to a nozzle. The detachable body 20 is magnetically connected to the main body 10 through the second connecting member 21. When disassembling and assembling the detachable member on the main body 10, only the magnetic force between the second connecting member 21 and the main body 10 needs to be overcome, without other operations. The second connecting member 21 and the main body 10 are magnetically connected, so that the second connecting member 21 is not easily worn. After the second connecting member 21 and the main body 10 are aligned in position, they can be automatically connected, making the disassembly and assembly process of the detachable member very convenient and fast, the installation process is accurate, the installation effect is good, and it is convenient for users to replace detachable members with different functions.

[0090] Further, the second air inlet is of an annular structure. Both the second air inlet and the first air outlet 12 are of an annular structure, which can achieve good docking and reduce the loss during air flow. Continuing to refer to Figure 7, One achievable way of the detachable part is that there are connecting bumps 22 arranged on the radially inner side of the annular structure, and the second connecting part 21 is arranged on the connecting bumps 22. When the detachable part is connected to the main body 10, the connecting bumps 22 can extend into the recessed part of the positioning structure 30 so that the second connecting part 21 is connected to the first connecting part 13.

[0091] Figure 7 As shown by the arrow in , one achievable flow path of the air flow is shown. The detachable part has a fluid channel communicating with the first air outlet 12. The fluid channels are distributed around the connecting bumps 22. When the connecting bumps 22 extend into the recessed part, the fluid channels communicate with the first air outlet 12 through the second air inlet. The air flow blown out from the first air outlet 12 enters the fluid channels through the second air inlet and is then blown out through the second air outlet.

[0092] When the first connecting part 13 is an annular structure, there are multiple second connecting parts 21, which are evenly arranged around the central axis of the connecting bumps 22; or, the second connecting part 21 is an annular structure, and the second connecting part 21 is an annular structure matching the first connecting part 13. When the second connecting part 21 is an annular structure, the first connecting part 13 may not be an annular structure and may be multiple, and are evenly arranged along the center of the bottom of the recessed part.

[0093] Furthermore, to enhance the installation strength of the second connecting part 21, fixing grooves 221 are arranged on the connecting bumps 22. For example, fixing grooves 221 are arranged on the side of the connecting bumps 22 facing the main body 10, and the second connecting part 21 is fixedly connected in the fixing grooves 221. The installation position of the second connecting part 21 can be fixed through the fixing grooves 221 to prevent the second connecting part 21 from moving. The second connecting part 21 is further adhesively connected or clamped in the fixing grooves 221.

[0094] It should be noted that the detachable part in Embodiment 2 can be used in cooperation with the hair dryer in Embodiment 1. When there is no structural conflict, the technical features in Embodiment 2 and the technical features in Embodiment 1 can be referred to each other, and will not be elaborated here one by one.

[0095] Based on Embodiment 1 and Embodiment 2, the embodiment of the present application further provides a hair dryer. The main body 10 in Embodiment 3 can be realized by the main body described in Embodiment 1, and the detachable part can be realized by the detachable part in Embodiment 2. When there is no structural conflict, the technical features in Embodiment 3 and the technical features in Embodiment 1 and Embodiment 2 can be referred to each other.

[0096] Specifically, referring to Figure 1 and Figure 2 , in an embodiment of the present application, a hair dryer is provided, including a main body 10 and a detachable body 20.

[0097] Wherein, the main body 10 includes a housing which has a first air inlet 11 and a first air outlet 12, and a first connecting member 13 is provided at the first air outlet 12. The detachable body 20 has a second air inlet and a second air outlet, and a second connecting member 21 is provided at the second air inlet. The second connecting member 21 is magnetically connected to the first connecting member 13 to connect the detachable body 20 to the main body 10 and communicate the second air inlet and the first air outlet 12.

[0098] In the technical solution provided by the embodiment of the present application, the main body 10 is magnetically connected to the second connecting member 21 on the detachable body 20 through the first connecting member 13. When disassembling and assembling the detachable body 20 on the main body 10, only the magnetic force between the first connecting member 13 and the second connecting member 21 needs to be overcome, without other operations. The magnetic connection between the first connecting member 13 and the second connecting member 21 makes the first connecting member 13 and the second connecting member 21 not easily worn. After the positions of the first connecting member 13 and the second connecting member 21 are aligned, they can be automatically connected, making the disassembly and assembly process of the detachable body 20 very convenient and fast, the installation process accurate, the installation effect good, and it is convenient for users to replace detachable parts with different functions.

[0099] In a feasible embodiment of the present application, referring to Figure 1 , a feasible way of the main body 10 in the embodiment of the present application is that the main body 10 includes a housing. Various functional components of a hair dryer are arranged in the cavity of the housing, and a first air inlet 11 and a first air outlet 12 are provided on the housing. The housing extends substantially longitudinally. The first air inlet 11 is located at the front end of the housing, and the first air outlet 12 is located at the rear end of the housing. The first air inlet 11 and the first air outlet 12 are on the same horizontal plane. Such a design can reduce the loss on the air flow path.

[0100] The components arranged inside the housing include but are not limited to a controller assembly and a heating component 50, a blower assembly 60, etc. connected to the controller assembly. Relative to the first air inlet 11 and the first air outlet 12, the blower assembly 60 is closer to the first air inlet 11, and the heating component 50 is closer to the first air outlet 12. The blower assembly 60 includes a motor for driving the fan and a fan for generating negative pressure by rotation. The blower assembly is configured to form a negative pressure during operation to suck air from the first air inlet 11 into the main body 10, and after being heated by the heating component 50, it is blown out from the first air outlet 12.

[0101] The main body 10 further includes a handle 40. The user can hold the hair dryer through the handle 40 to blow air. Control buttons connected to the controller assembly are provided on the handle 40. By using the control buttons, the user can control the hair dryer to perform different functions. For example, the user can control the hair dryer to blow air of different sizes. A battery assembly is also provided inside the handle 40. The battery assembly is connected to the controller assembly and is configured to provide electrical energy for other components. Alternatively, the power cord of the hair dryer passes through the handle 40 and is connected to the controller assembly, and the power cord is connected to an external power source to provide electrical energy for other components. In this embodiment, in one possible implementation, the extending direction of the handle 40 is perpendicular to the extending direction of the housing. And one end of the handle 40 is connected to the middle position between the front and rear ends of the housing, so that the entire main body 10 has a T-shaped structure.

[0102] See Figure 1 , Figure 1 The arrow shown in indicates a possible flow path of the air flow of the hair dryer. When the hair dryer is working, the air flow is inhaled from the first air inlet 11, passes through components such as the fan assembly 60 and the heating assembly 50, passes through the first air outlet 12 of the main body 10, and then is discharged through the detachable part.

[0103] In the embodiment of the present application, the first connecting member 13 includes but is not limited to a magnet, an iron sheet or other components made of a magnetically conductive material. When the first connecting member 13 is a magnet, the detachable part can be made of iron material. Alternatively, the second connecting member 21 on the detachable body 20 includes but is not limited to a magnet, an iron sheet or other components made of a magnetically conductive material. When the first connecting member 13 is an iron sheet or other components made of a magnetically conductive material, the second connecting member 21 is a magnet.

[0104] Further, to facilitate the user to freely adjust the air outlet angle of the detachable part, in the embodiment of the present application, the shape of the first connecting member 13 can be set as an annular structure. After the detachable part is connected to the first connecting member 13, the detachable part can rotate arbitrarily along the plane where the first connecting member 13 is located, so as to adjust the air outlet angle of the detachable part.

[0105] See Figure 3 , in a possible implementation embodiment of the present application, the first air outlet 12 is an annular structure, and the first connecting member 13 is arranged on the radial inner side of the annular structure. The annular first air outlet can make the blowing range of the air flow larger, thereby improving the blowing effect of the air flow. Arranging the first connecting member 13 on the radial inner side of the annular structure enables the first connecting member 13 to magnetically connect the detachable part without affecting the air outlet of the first air outlet 12.

[0106] To better fix the first connecting member 13, in a possible implementation embodiment of the present application, see Figure 3, the hair dryer further includes a positioning structure 30. Among them, the positioning structure 30 is located radially inside the first air outlet 12, and the positioning structure 30 is connected to the housing through a plurality of connecting ribs 31. There is a gap between the positioning structure 30 and the housing, and the gap forms the first air outlet 12 with an annular structure. The first connecting member 13 is connected and fixed to the positioning structure 30. In an implementable manner, the positioning structure 30, the connecting ribs 31 and the housing are an integrally formed structure. The positioning structure 30 has a recessed portion that is recessed into the housing, and the first connecting member 13 is disposed in the recessed portion. The recessed portion is located radially inside the annular first air outlet 12, and the first air outlet 12 surrounds the periphery of the positioning structure 30. The first connecting member 13 is located in the recessed portion, and the bottom of the recessed portion is used to connect the first connecting member 13. The detachable member can be inserted into the recessed portion and magnetically connected to the first connecting member 13 through the second connecting member 21.

[0107] Continue to refer to Figure 3 , to better fix the first connecting member 13, a mating structure connected to the first connecting member 13 is provided in the recessed portion. The first connecting member 13 is located in the recessed portion and fixed to the mating structure. In the embodiment of the present application, in an implementable manner, the mating structure can be a bearing platform, and the first connecting member 13 is fixedly connected to the bearing platform. In another implementable manner, the mating structure is a first stepped structure 3221. To further facilitate the installation of the first connecting member 13 and limit the position of the first connecting member 13, a second stepped structure 131 that cooperates with the first stepped structure 3221 is provided on the first connecting member 13. The first stepped structure 3221 is snap-connected to the second stepped structure 131. The position of the second connecting member 21 can be limited by the first stepped structure 3221 and the second stepped structure 131, effectively preventing the misalignment of the installation of the first connecting member 13. At the same time, during installation, there is no need to deliberately align the installation positions of the first connecting member 13 and the bearing platform, which facilitates the installation of the first connecting member 13.

[0108] Continue to refer to Figure 3, One feasible way of the positioning structure 30 is that the positioning structure 30 includes a first positioning member 32 and a second positioning member 33. Among them, the first positioning member 32 has the recessed portion that is recessed towards the inside of the housing. The first positioning member 32 with the recessed portion has a bowl-shaped structure and is located inside the first air outlet 12 of the annular structure. That is to say, the radius of the first positioning member 32 is smaller than the radius of the first air outlet 12. The first positioning member 32 is connected to the housing of the main body 10 through a plurality of the connecting ribs 31. The second positioning member 33 is received in the recessed portion, that is, the second positioning member 33 is received inside the bowl-shaped structure, and is connected to the first positioning member 32, and clamps and fixes the first connecting member 13 located between the first positioning member 32 and the second positioning member 33. To enhance the connection strength of the first connecting member 13, the first connecting member 13 and the first positioning member 32 can also be pre-connected by bonding, snap connection or other means and then clamped and fixed by the second positioning member 33.

[0109] In a feasible embodiment of the present application, refer to Figures 4 to 6 , the bottom of the recessed portion has a positioning portion 323. The second positioning member 33 includes a fixing plate 331 and a connecting column 332 arranged on the fixing plate 331. The connecting column 332 is connected to the positioning portion 323. The fixing plate 331 and the first positioning member 32 form a clamping structure to clamp and fix the first connecting member 13.

[0110] For example, the recessed portion is an installation groove 321, the installation groove 321 is recessed towards the inside of the housing, a bearing surface 322 is provided on the groove wall of the installation groove 321, the bearing surface 322 can be composed of a plurality of protrusions on the groove wall, or the bearing surface 322 is a boss provided around the groove wall. The positioning portion 323 can be one or more. When the positioning portion 323 is one, the positioning portion 323 is arranged at the central position of the bottom of the installation groove 321. When the positioning portion 323 is multiple, the positioning portion 323 is arranged at the bottom of the installation groove 321 and is evenly arranged around the center of the bottom of the installation groove 321. A screw hole is provided on the positioning portion 323, and the connecting column 332 can be connected to the positioning portion 323 by a screw.

[0111] To further facilitate the installation of the first connecting member 13 and limit the position of the first connecting member 13, refer to Figure 4 and Figure 6, a first step structure 3221 is provided on the bearing surface 322. A second step structure 131 is provided on the first connecting member 13 and is used in cooperation with the first step structure 3221. The first step structure 3221 is snap-connected to the second step structure 131. The positions of the second connecting member 21 can be defined by the first step structure 3221 and the second step structure 131, effectively preventing the misalignment of the installation of the first connecting member 13. At the same time, during installation, there is no need to deliberately align the installation positions of the first connecting member 13 and the bearing platform, which facilitates the installation of the first connecting member 13.

[0112] Further, to facilitate the installation of the second positioning member 33, refer to Figure 5 , a third step structure 3311 is provided on the fixing plate 331 and is used in cooperation with the second step structure 131. The third step structure 3311 is snap-connected to the second step structure 131, and the surface of the fixing plate 331 is flush with the surface of the first connecting member 13. The connection position of the second positioning member 33 can be defined by the second step and the third step, effectively preventing the misalignment of the installation of the second positioning member 33, and at the same time facilitating the installation of the second positioning member 33.

[0113] To prevent the second positioning member 33 from rotating, continue to refer to Figure 4 and Figure 5 , in the embodiment of the present application, a positioning groove 3231 is provided on the positioning portion 323, and a limiting notch 3232 is provided on the groove wall of the positioning groove 3231. A limiting strip 3321 is provided on the connecting column 332 and is used in cooperation with the limiting notch 3232. The connecting column 332 extends into the positioning groove 3231 to be connected to the positioning portion 323. The limiting strip 3321 extends into the limiting notch 3232 to prevent the second positioning member 33 from rotating radially. The limiting notch 3232 extends along the axial direction of the installation groove 321. The limiting notch 3232 can be one or more, and the number of the limiting strips 3321 can be the same as or less than the number of the limiting notches 3232. When the connecting column 332 extends into the positioning groove 3231, the connecting column 332 drives the limiting strip 3321 to enter the limiting notch 3232. Under the combined action of the limiting notch 3232 and the limiting strip 3321, the connecting column 332 cannot rotate, so that the second positioning member 33 will not rotate either.

[0114] Further, refer to Figure 7, the second air inlet is of an annular structure. Both the second air inlet and the first air outlet 13 are of annular structures, which can achieve good docking and reduce the loss during air flow. One realizable way of the detachable part is that a connecting lug 22 is arranged on the radial inner side of the annular structure, and the second connecting part 21 is arranged on the connecting lug 22. When the detachable body 20 is connected to the main body 10, the connecting lug 22 can extend into the recessed part of the positioning structure 30 so that the second connecting part 21 is connected to the first connecting part 13.

[0115] Figure 7 As shown by the arrow in , it is a realizable air flow path. The detachable body 20 has a fluid channel communicating with the first air outlet 12. The fluid channels are distributed around the connecting lug 22. When the connecting lug 22 extends into the recessed part, the fluid channel communicates with the first air outlet 12 through the second air inlet. The air flow blown out from the first air outlet 12 enters the fluid channel through the second air inlet and then is blown out through the second air outlet.

[0116] When the first connecting part 13 is of an annular structure, the second connecting parts 21 are multiple and are uniformly arranged around the central axis of the connecting lug 22; or, the second connecting part 21 is of an annular structure, and the second connecting part 21 is an annular structure matching the first connecting part 13. When the second connecting part 21 is of an annular structure, the first connecting part 13 may not be of an annular structure and may be multiple and are uniformly arranged along the center of the bottom of the recessed part.

[0117] Further, to enhance the installation strength of the second connecting part 21, a fixing groove 221 is arranged on the connecting lug 22. For example, a fixing groove 221 is arranged on the side of the connecting lug 22 facing the main body 10, and the second connecting part 21 is fixedly connected in the fixing groove 221. The installation position of the second connecting part 21 can be fixed through the fixing groove 221 to prevent the second connecting part 21 from moving. The second connecting part 21 is further adhesively connected or clamped in the fixing groove 221.

[0118] It should be noted that, without conflict in the structure, the technical features in Embodiment 3 can be referred to those in Embodiment 1 and Embodiment 2, and will not be elaborated here one by one.

[0119] Next, in combination with specific application scenarios, the technical solutions adopted in this application will be described to help understanding. In the following application scenarios, a hand-held hair dryer is taken as an example, the detachable part is a nozzle, the first connecting part is a magnet, and the second connecting part is an iron sheet.

[0120] Application Scenario 1

[0121] When the user needs to remove the nozzle from the main body, apply a force to the nozzle and pull the nozzle along the extension direction of the airflow, so that the magnet provided on the main body is separated from the iron sheet provided on the nozzle, and the nozzle is separated from the main body.

[0122] When installing the nozzle, bring the nozzle close to the main body so that the positions of the magnet and the iron sheet correspond, and the magnet and the iron sheet are automatically adsorbed to complete the installation of the nozzle.

[0123] Application Scenario 2

[0124] When the user needs to remove the nozzle from the hair dryer, apply a force to the nozzle and rotate the nozzle so that the positions of the magnet and the iron sheet are misaligned and the magnetic force disappears. Pull the nozzle along the extension direction of the airflow, so that the nozzle is separated from the main body.

[0125] When installing the nozzle, insert the nozzle into the installation groove. After inserting a certain distance, rotate the nozzle so that the positions of the magnet and the iron sheet correspond, and then the magnet and the iron sheet are automatically adsorbed to complete the installation of the nozzle.

[0126] Application Scenario 3

[0127] At least one of the magnet and the iron sheet is annular, and the nozzle can rotate freely.

[0128] When the user needs to remove the nozzle from the main body, apply a force to the nozzle and pull the nozzle along the extension direction of the airflow, so that the magnet provided on the main body is separated from the iron sheet provided on the nozzle, and the nozzle is separated from the main body.

[0129] When installing the nozzle, bring the nozzle close to the main body so that when the distance between the magnet and the iron sheet is small enough, the magnet and the iron sheet are automatically adsorbed to complete the installation of the nozzle.

[0130] In addition to the problems such as the inconvenient disassembly and assembly of the nozzle mentioned above, the inventor found that when adjusting the air volume and temperature of the existing hair dryer, the button method is generally used to manually set the air volume and temperature gears. Whether there is a user object in front of the first air outlet of the hair dryer or not, and regardless of the distance between the user object and the hair dryer, if there is no manual operation, it can only operate at a fixed air volume and temperature gear. When the user feels uncomfortable, they can only move the hair dryer away or manually switch to other gears until they find a suitable air volume and temperature gear. It is very inconvenient to use and the user experience is poor.

[0131] The reason is that the inventor believes that the current hair dryer products lack the technology to identify the distance of the user object and cannot adjust the air temperature and air volume according to the distance between the hair dryer and the user. Therefore, it can only rely on the user's self-awareness to passively adjust the distance manually or switch gears.

[0132] In view of the above problems, the present application further provides the following embodiments, which can control the working states of the heating component and the blower component according to the distance information of the distance sensor, thereby adjusting the wind temperature and wind speed, effectively improving the intelligence of the hair dryer, effectively realizing the protection of the human body, and being simple and convenient.

[0133] For example, Figure 8 FIG. 5 is a schematic cross-sectional structure diagram of a hair dryer provided in an embodiment of the present application. Figure 9 FIG. 6 is a schematic circuit diagram of a hair dryer provided in an embodiment of the present application. Figure 10 FIG. 7 is a schematic bottom view structure diagram of a hair dryer provided in an embodiment of the present application, as Figures 8 to 10 shown.

[0134] In an embodiment of the present application, a hair dryer is provided, including: a main body 10 and a distance sensor 200. Among them, the main body 10 has a first air inlet 11 and a first air outlet 12. As Figure 9 shown, a main control board 213, a heating component 50 and a blower component 60 electrically connected to the main control board 213 are arranged in the main body 10. The distance sensor 200 is arranged at the end of the first air outlet 12 and is electrically connected to the main control board 213, so that the main control board 213 can receive the distance signal detected by the distance sensor 200 and control the working states of the heating component 50 and the blower component 60.

[0135] It should be noted here that: the controller component electrically connected to the blower component 60 and the heating component 50 mentioned above may include the main control board 213 mentioned in this embodiment.

[0136] According to the technical solution provided by the embodiment of the present application, the distance sensor 200 can detect the distance between the first air outlet 12 of the main body 10 and the measured human body, and the main control board 213 can control the working states of the heating component 50 and the blower component 60 according to the distance signal of the distance sensor 200, effectively improving the intelligence of the hair dryer, effectively realizing the protection of the human body, and being simple and convenient.

[0137] In a feasible embodiment of the present application, refer to Figure 8, One possible implementation of the main body 10 in the embodiments of the present application is that the main body 10 includes a housing. Various functional components of the hair dryer are arranged in the cavity of the housing. A first air inlet 11 and a first air outlet 12 are arranged on the housing. The components arranged inside the housing include but are not limited to a main control board 213, a heating component 50 connected to the main control board 213, a fan assembly 60, etc. The fan assembly 60 includes a motor for driving the fan and a fan that generates negative pressure by rotation. The fan assembly 60 is configured to form negative pressure during operation to suck air into the main body 10 from the first air inlet 11, and after passing through the heating component 50, blow it out from the first air outlet 12. A handle 40 is also arranged on the main body 10, and the user can hold the hair dryer through the handle 40 to blow air.

[0138] It should be noted that in the embodiments of the present application, in order to enable the main control board 213 to control the heating component 50 and the fan assembly 60, a control circuit for controlling the working states of the heating component 50 and the fan assembly 60 is arranged on the main control board 213. Through this control circuit, the main control board 213 can control the fan assembly 60 in various working states. For example, it can control the start and stop of the fan assembly 60, and realize the magnitude of the wind force blown out by the fan assembly 60 by controlling different rotation speeds, and control the fan assembly 60 to blow strong wind, gentle wind and other states. Of course, the control of the wind force magnitude is not limited to strong wind and gentle wind, and various wind forces can be controlled to blow out according to different requirements. The main control board 213 can also control the heating component 50 in various working states. For example, it can control the start and stop of the heating component 50, and control the temperature of the heating component 50 by controlling the energizing current of the heating component 50, so as to realize the state that the blown air becomes hot air, slightly hot air, etc.

[0139] In the embodiments of the present application, the distance sensor 200 is configured to detect the distance between the first air outlet 12 and the measured human body and send the above distance signal to the main control board 213. The distance sensor 200 includes but is not limited to one or more of an infrared ranging sensor, a radar ranging sensor or a laser ranging sensor. The detection distance accuracy of the distance sensor 200 is 1 mm, and the maximum detection range is 1 m. Of course, the detection distance accuracy and the maximum detection range of the distance sensor 200 can be adjusted accordingly according to different detection requirements, and no specific limitation is made here. Figure 10 The triangular area in represents the detection range of the distance sensor 200, Figure 10 which is only schematic and does not constitute an improper limitation of the embodiments of the present application.

[0140] The main control board 213 can control the working states of the blower assembly 60 and the heating assembly 50 according to the received distance signal. For example, when the distance sensor 200 detects that the distance between the first air outlet 12 and the measured human body becomes closer, the main control board 213 can control the wind speed of the blower assembly 60 to become smaller and the temperature of the heating assembly 50 to become smaller, so that the air blown out from the first air outlet 12 is slightly hot air, and the user does not have to worry about burning their hair when using the hair dryer as the first air outlet 12 is too close to the hair. For another example, when the distance sensor 200 detects that the distance between the first air outlet 12 and the measured human body becomes farther, the main control board 213 can control the wind speed of the blower assembly 60 to become larger and the temperature of the heating assembly 50 to become larger, so that the air blown out from the first air outlet 12 is strong hot air, and the user does not have to worry about the temperature and wind speed being too low when the first air outlet 12 is too far from the hair, resulting in poor hair drying effect. The hair dryer can automatically adjust the air temperature and wind speed according to the distance detection, greatly improving the user experience.

[0141] Specifically, in the embodiment of the present application, the main control board 213 can automatically adjust the power of the blower assembly 60 and the heating assembly 50 according to the distance signal of the distance sensor 200, so that the temperature and the air volume at the position of the measured human body remain constant, thereby ensuring that the user is always within a reasonable temperature and air volume range. For example, when the distance between the position of the measured human body and the first air outlet 12 is far, the power of the heating assembly 50 is increased, and when the distance between the position of the measured human body and the first air outlet 12 is close, the power of the heating assembly 50 is decreased, so that the temperature at the position of the measured human body remains constant. Similarly, the main control board 213 adjusts the power of the blower assembly 60 according to the distance signal, so that the air volume at the position of the measured human body remains constant.

[0142] It should be noted that the process of the distance sensor 200 detecting the distance between the first air outlet 12 and the measured human body can be real-time, and the main control board 213 controlling the working states of the blower assembly 60 and the heating assembly 50 is also real-time. For example, when the distance sensor 200 detects that the distance between the first air outlet 12 and the measured human body is gradually becoming farther or closer, the main control board 213 can control the wind speed of the blower assembly 60 to gradually become larger or smaller, and the temperature of the heating assembly 50 to gradually become larger or smaller.

[0143] The process of the distance sensor 200 detecting the distance between the first air outlet 12 and the human body to be measured can be real-time. The main control board 213 controls the working states of the blower assembly 60 and the heating assembly 50 in stages. For example, every time the distance sensor 200 detects that the distance between the first air outlet 12 and the human body to be measured reaches a predetermined value, the main control board 213 can control the blower assembly 60 and the heating assembly 50 to change their states. For instance, when the hair dryer is 10 cm away from the human body, the main control board 213 can control the blower assembly 60 to blow gentle wind, and the temperature of the heating assembly 50 is 10 degrees. When the hair dryer is 20 cm away from the human body, the main control board 213 can control the blower assembly 60 to blow strong wind, and the temperature of the heating assembly 50 is 15 degrees. Of course, the predetermined value can be adjusted accordingly according to different detection requirements, and no specific limitation is made here.

[0144] When people use a hair dryer in daily life, the following several special situations often occur. For example, the first air outlet 12 of the hair dryer is too close to the human body. At this time, if the hair dryer continues to operate, it is easy to cause harm to the human body, such as scalding. For another example, the first air outlet 12 of the hair dryer is too far from the human body. At this time, if the hair dryer continues to operate, it cannot blow on the human body, and the hair dryer is in an idling state, resulting in waste of resources. For the above two situations, the processing methods in the embodiments of the present application include, but are not limited to, the following methods:

[0145] A first distance threshold and a second distance threshold are pre-stored in the main control board 213. Among them, the first distance threshold is used as the minimum safe distance of the hair dryer. When the main control board 213 receives a distance signal from the distance sensor 200, the distance signal represents the distance between the hair dryer and the human body to be measured. The distance signal is compared with the first distance threshold. When the distance between the hair dryer and the human body to be measured is greater than or equal to the first distance threshold, it means that the human body is still within the minimum safe distance, and the hair dryer can continue to work. When the distance between the hair dryer and the human body to be measured is equal to the first distance threshold, the main control board 213 can control the blower assembly 60 and the heating assembly 50 to operate in the minimum working state. For example, the blower assembly 60 is adjusted from the strong wind state to the gentle wind state. When the distance between the hair dryer and the human body to be measured is less than the first distance threshold, it means that the human body is no longer within the minimum safe distance. If the hair dryer continues to work, it is easy to cause damage to the human body. At this time, the main control board 213 can control the blower assembly 60 and the heating assembly 50 to stop running. When stopping, when the distance between the hair dryer and the human body to be measured returns to be greater than or equal to the first distance threshold again, the main control board 213 can control the blower assembly 60 and the heating assembly 50 to run again. In the embodiments of the present application, the first preset distance is 10 cm. Of course, the first preset distance can be adjusted accordingly according to different detection requirements, and no specific limitation is made here.

[0146] The second distance threshold serves as the maximum safe distance of the hair dryer. When the main control board 213 receives the distance signal from the distance sensor 200, it compares the distance signal with the second distance threshold. When the distance between the hair dryer and the measured human body is less than or equal to the second distance threshold, it indicates that the human body is still within the maximum safe distance, and the hair dryer can continue to operate. When the distance between the hair dryer and the measured human body is equal to the second distance threshold, the main control board 213 can control the fan assembly 60 and the heating assembly 50 to operate at the maximum working state. When the distance between the hair dryer and the measured human body is greater than the second distance threshold, it indicates that the human body is no longer within the maximum safe distance. If the hair dryer continues to operate, it will not be able to blow on the human body and is in an idling state. At this time, the main control board 213 can control the fan assembly 60 and the heating assembly 50 to stop operating, or adjust to the minimum operating state. When stopping the operation, when the distance between the hair dryer and the measured human body resumes to be less than or equal to the second distance threshold, the main control board 213 can control the fan assembly 60 and the heating assembly 50 to operate again. In the embodiment of the present application, the second preset distance is 1 m. Of course, the second preset distance can be adjusted accordingly according to different detection requirements, and no specific limitation is made here.

[0147] In the embodiment of the present application, by pre-storing the first distance threshold and the second distance threshold in the main control board 213, the hair dryer can more intelligently adjust the air temperature and air speed of the blown air, and can effectively solve the following problems: For example, when the existing hair dryer is first turned on, it can only operate at the current gear, and it will also operate at high wind and high heat when blowing air without an object. However, for the hair dryer in the embodiment of the present application, when the hair dryer is turned on, it can determine whether there is a user object. If there is no user object, the main control board 213 can control the fan assembly 60 and the heating assembly 50 to stop operating, or adjust to the minimum operating state.

[0148] For another example, if the first air outlet 12 of the hair dryer is too close to the user object, the main control board 213 can control the fan assembly 60 and the heating assembly 50 to reduce the air speed and air temperature to avoid scalding the scalp or hair of the user object. If the distance is less than the first distance threshold, the main control board 213 can control the fan assembly 60 and the heating assembly 50 to stop operating. If the first air outlet 12 of the hair dryer is too far from the user object, the main control board 213 can control the fan assembly 60 and the heating assembly 50 to increase the air speed and air temperature to increase the hair drying effect.

[0149] Further, for better identification of the distance signal detected by the distance sensor 200, refer to Figure 9, in the embodiment of the present application, the distance sensor 200 is connected to the main control board 213 through a distance recognition circuit 16. After receiving the distance signal from the distance sensor 200, the distance recognition circuit 16 transmits it to the main control board 213. The main control board 213 controls the working states of the blower assembly 60 and the heating assembly 50 according to the distance information, so as to adjust the air temperature and air speed of the air blown out by the hair dryer. In the embodiment of the present application, the distance recognition circuit 16 includes but is not limited to an A / D conversion circuit (analog-to-digital converter). The distance sensor 200 detects the distance signal and transmits it to the A / D conversion circuit for analog-to-digital conversion to form digital information. The A / D conversion circuit transmits the digital information to the main control board 213, and the main control board 213 judges the distance information according to the digital information and controls the working states of the blower assembly 60 and the heating assembly 50 according to the distance information. It should be noted that the distance recognition circuit 16 can be used as an independent component or integrated on the main control board 213.

[0150] Continue to refer to Figure 8 , in the embodiment of the present application, the hair dryer further includes a nozzle 230, and the nozzle 230 is located at the active first air outlet 12 and is connected to the main body 10. When the hair dryer is in use, the main body 10 of the hair dryer is usually used in cooperation with the nozzle 230 to achieve different air outlet effects by replacing nozzles 230 with different functions. One implementation of the nozzle is that the nozzle 230 includes an air outlet part 231 and a connecting convex block 22 provided on the air outlet part 231, and the connecting convex block 22 is rotatably connected to the main body 10. The nozzle 230 can rotate relative to the main body 10, so as to change the air outlet angle.

[0151] Refer to Figures 10 to 12 , one possible implementation of the air outlet part 231 is a flat mouth structure. When the flat mouth structure of the air outlet part 231 rotates, the end may block the distance sensor 200, and the blocked distance sensor 200 will not be able to work properly, or the detected distance is always less than the first distance threshold, so that the main control board 213 controls the blower assembly 60 and the heating assembly 50 to stop running.

[0152] To prevent the nozzle 230 from blocking the distance sensor 200, continue Figures 10 to 12 , in a possible implementation embodiment of the present application, there are at least two distance sensors 200. Each distance sensor 200 is independently electrically connected to the main control board 213. The connection line between every two distance sensors 200 does not pass through the center point of the first air outlet 12. Each distance sensor 200 can detect independently, that is, as long as one sensor detects the measured human body, the main control board 213 will automatically adjust the air speed and temperature according to the distance information detected by the distance sensor 200. Refer to Figure 11 , Figure 11The air outlet part 231 of the air nozzle 230 is in a vertical state, and the air outlet part 231 of the air nozzle 230 passes through the center point of the first air outlet 12. There are two distance sensors 200, and the two distance sensors 200 are distributed on both sides of the air nozzle 230. The connection line between the two distance sensors 200 does not pass through the center point of the first air outlet 12. When the air nozzle 230 rotates, no matter what angle the air outlet part 231 rotates to, it will not block both distance sensors 200 at the same time. That is to say, no matter how the air nozzle 230 rotates, there will always be a distance sensor 200 that is not blocked, and at least one distance sensor 200 is in a normal working state, so as to ensure the normal use of the hair dryer. Figure 11 The situation shown in [Figure] is the situation where the air nozzle 230 does not block any of the distance sensors 200, and both distance sensors 200 can be detected normally. Refer to Figure 12 , Figure 12 The situation shown in [Figure] is that the air outlet part 231 of the air nozzle 230 has rotated a certain angle and blocked one of the distance sensors 200, but the other sensor is not blocked and can still be detected normally.

[0153] Furthermore, in the embodiment of the present application, the distance sensor 200 includes a transmitting area and a receiving area. The connection line between the transmitting area on each distance sensor 200 and the transmitting area and the receiving area on the other distance sensor 200 does not pass through the center point of the first air outlet 12. The connection line between the receiving areas on each distance sensor 200 and the receiving areas on the other distance sensor 200 does not pass through the center point of the first air outlet 12. No matter how the air nozzle 230 rotates, the air nozzle 230 cannot block the transmitting areas and the receiving areas of both sensors at the same time, that is, there is always a sensor that is not blocked, and at least one sensor is in a normal working state, so as to ensure the normal use of the hair dryer.

[0154] In the above embodiment, when at least two distance sensors 200 detect normally, the main control board 213 will receive two distance signals. Since when the hair dryer is in use, the user may shake the hair dryer back and forth, causing the hair dryer to have different blowing angles, resulting in inconsistent distance signals detected by at least two distance sensors 200. If the main control board 213 controls the working states of the fan assembly 60 and the heating assembly 50 according to the two distance signals, the wind speed and wind temperature of the air blown out by the hair dryer may be very chaotic, and the blowing effect may not be good.

[0155] To avoid this situation, in an achievable embodiment of the present application, a correction circuit is provided on the main control board 213, and the correction circuit is electrically connected to the distance sensor 200. The function of the correction circuit is to correct at least two distance signals into one distance signal, so that the main control board 213 controls the working states of the fan assembly 60 and the heating assembly 50 according to the corrected distance signal. The ways for the correction circuit to correct the distance signal include but are not limited to the following ways:

[0156] One achievable way is that the correction circuit randomly selects one distance signal from at least two distance signals and transmits it to the main control board 213.

[0157] Another achievable way is that the correction circuit selects the distance signal with a shorter distance between the first air outlet 12 and the measured human body from at least two distance signals and transmits it to the main control board 213.

[0158] Another achievable way is that the correction circuit calculates the average distance of at least two distance signals and transmits the average distance to the main control board 213.

[0159] It should be noted that the correction circuit can be used as an independent component or integrated on the main control board 213.

[0160] In the embodiment of the present application, a heat insulation layer is provided on the outer periphery of the distance sensor 200. The heat insulation layer is around the distance sensor 200 and is used to protect the distance sensor 200 from the temperature of the first air outlet 12. The shape of the heat insulation layer can be set to match the shape of the distance sensor 200. It should be noted that the shape and material of the heat insulation layer can be set according to different heat insulation requirements, and the embodiment of the present application does not make specific limitations.

[0161] Further, to improve the installation strength of the distance sensor 200, in the embodiment of the present application, an installation hole is provided at the end of the first air outlet 12. The distance sensor 200 is installed in the installation hole. The heat insulation layer is provided between the installation hole and the distance sensor 200. The installation hole can, on the one hand, limit the installation position of the distance sensor 200, facilitating the positioning and installation of the distance sensor 200; on the other hand, the distance sensor 200 is located in the installation hole, playing a certain protective role for the distance sensor 200 to prevent the distance sensor 200 from being damaged by external objects. The heat insulation layer is provided in the installation hole to prevent the temperature from passing through the installation hole and affecting the distance sensor 200.

[0162] Continue to refer to Figures 10 to 12, a handle 40 is further provided on the main body 10. A control unit 218 is provided on the handle 40, and the control unit 218 is electrically connected to the main control board 213. The control unit 218 can be used to control the hair dryer to perform different functions. For example, it can control the start and stop of the fan assembly 60 and the heating assembly 50, and control the fan assembly 60 to blow out winds of different sizes. When the distance sensor 200 detects that the distance between the hair dryer and the measured human body is less than the first distance threshold, or detects that the distance between the hair dryer and the measured human body is greater than the second distance threshold, the main control board can also control the fan assembly 60 and the heating assembly 50 to stop running through the control unit 218. Further, a battery assembly is also provided inside the handle 40. The battery assembly is connected to the main control board 213, and the battery assembly is configured to supply electrical energy to the main control board 213, the fan assembly 60 and the heating assembly 50, or the power cord of the hair dryer passes through the handle 40 and is connected to the main control board 213, and the power cord is connected to an external power supply to supply electrical energy to the main control board 213, the fan assembly 60 and the heating assembly 50. In specific implementation, the control unit 218 may include: at least one control switch or touch control, etc. When there are multiple control switches or touch controls, each control switch or touch control can respectively correspond to different function controls, such as wind force size control function, cold and warm control function, etc.

[0163] Further, a temperature sensor is provided inside the main body 10. The temperature sensor is electrically connected to the main control board 213 so that the main control board 213 can receive the temperature signal detected by the temperature sensor and control the working states of the heating assembly 50 and the fan assembly 60. The temperature of the heating assembly 50 can be detected in real time through the temperature sensor, and the temperature signal is transmitted to the main control board 213. When the temperature exceeds the temperature threshold, the main control board 213 controls the heating assembly 50 to turn off or reduce the power, and controls the fan assembly 60 to increase the wind force or turn off, etc. The temperature threshold can be set according to different temperature requirements, and no specific limitation is made in the embodiments of the present application.

[0164] Next, in combination with a specific application scenario, the technical solution adopted in the present application will be described to help understanding. In the following application scenario, a handheld hair dryer is taken as an example, and two distance sensors are taken as an example.

[0165] Application Scenario 4

[0166] When the user needs to use the hair dryer, the distance sensor can detect the distance between the first air outlet of the hair dryer and the measured human body in real time.

[0167] When the distance sensor detects that the distance between the first air outlet and the measured human body becomes closer, the main control board can control the wind speed of the fan assembly to become smaller and the temperature of the heating assembly to become smaller, so that the wind blown out from the first air outlet is slightly hot air, and the user does not have to worry about the first air outlet being too close to the hair and scalding the hair when using the hair dryer.

[0168] When the distance sensor detects that the distance between the first air outlet and the measured human body becomes farther, the main control board can control the wind speed of the fan assembly to increase and the temperature of the heating assembly to increase, so that the air blown out from the first air outlet is strong hot air. When the user uses the hair dryer, there is no need to worry that the temperature and wind speed will be too low when the first air outlet is too far from the hair, resulting in poor hair drying effect.

[0169] Application Scenario 5

[0170] When the user needs to use the hair dryer, the distance sensor can detect the distance between the first air outlet of the hair dryer and the measured human body in real time.

[0171] When the distance sensor detects that the distance between the hair dryer and the measured human body is greater than or equal to the first distance threshold, the hair dryer can continue to work, and the fan assembly is in a gentle wind state.

[0172] When the distance between the hair dryer and the measured human body is less than the first distance threshold, it means that the human body is no longer within the minimum safe distance. At this time, the main control board can control the fan assembly and the heating assembly to stop running.

[0173] Application Scenario 6

[0174] When the user needs to use the hair dryer, the distance sensor can detect the distance between the first air outlet of the hair dryer and the measured human body in real time.

[0175] When the distance sensor detects that the distance between the hair dryer and the measured human body is less than or equal to the second distance threshold, the hair dryer can continue to work, and the hair dryer can adjust the wind speed and wind temperature of the blown air according to the distance from the human body.

[0176] When the distance between the hair dryer and the measured human body is greater than the second distance threshold, at this time, the main control board can control the fan assembly and the heating assembly to stop running, or adjust to run in the minimum operating state.

[0177] In addition, most existing hair dryers use heating wires to generate heat. The temperature of the heating wires is as high as about 500 degrees Celsius and can only be in direct contact with the mica support sheet. See Figure 13 As shown, the heating wire of the hair dryer product is wound around the mica sheet support frame 101, and the mica sheet support frame 101 is fixed on a cylinder 102. The end face of the cylinder 102 facing the fan assembly 60 is the windward face 100. The air flow coming out of the fan assembly 60 hits the windward face 100 directly, which is very easy to form turbulence and generate noise. In view of the problems existing in the prior art, the following embodiments are proposed in this application to reduce noise.

[0178] Figure 14a 、 14b is a schematic diagram of a hair dryer provided by an embodiment of the present application. See Figure 14a 、 14bAs shown in the figure, the hair dryer includes: a main body 10, a fan assembly 60, and a heating assembly 50. Among them, the main body 10 has an air flow channel; the fan assembly 60 is used to output the power to suck gas into the air flow channel; the heating assembly 50 is used to heat the air flow in the air flow channel. Among them, the air flow channel includes a first flow section 203 and a second flow section 201 with a stepped change, and a diversion section 202 is provided between the first flow section 203 and the second flow section 201, so that the air flow flows from the first flow section 203 to the second flow section 201 along the diversion path provided by the diversion section 202.

[0179] Taking Figure 14a the structure of the hair dryer shown as an example, the arrow numbered 204 in the figure schematically represents the air flow direction. At position ① in the figure is the air outlet position of the fan assembly, where the cross-section is small and the air flow velocity is fast. At position ② is the second flow section where the heating assembly is located, and the cross-sectional area of this second flow section is larger than that of the first flow section where the fan assembly is located. At position ③ is the first air outlet 12 of the air flow channel. After the air flow enters the first flow section 203 from the first air inlet 11 of the air flow channel and accelerates, it enters the second flow section 201 for heating and is discharged from the first air outlet 12. In this embodiment, a diversion section 202 is provided between the first flow section 203 and the second flow section 201 to guide the air flow to enter the second flow section 201 obliquely forward along Figure 14a the direction shown after coming out of the fan assembly 60. Compared with Figure 13 the structure shown, the technical solution provided by this embodiment has no windward surface where the air flow hits directly, the air flow route is smoother, reduces the turbulence generated by the air flow hitting the plane, helps to reduce noise; at the same time, it can also increase the air volume.

[0180] In the embodiment of the present application, the first flow section and the second flow section can be any flow sections in the air flow channel, and are not limited to Figure 14a , 14b the two flow sections 203 and 201 corresponding to the fan assembly 60 and the heating assembly 50 shown; as long as there is a stepped change between two adjacent flow sections, the air flow will hit the stepped surface at the connection of the two flow sections head-on, and a diversion section can also be provided between these two flow sections to reduce the turbulence generated by the air flow hitting the plane.

[0181] Continuing to take Figure 14a , 14b the structure shown as an example, in the hair dryer provided by this embodiment: the space between the outer wall 140 of the fan assembly 60 and the inner wall 17 of the main body 10 is the first flow section 203; the space between the outer wall 150 of the heating assembly 50 and the inner wall 17 of the main body 10 is the second flow section 201.

[0182] Specifically, referring to Figure 14a, 14b As shown, the cross-sectional area of the inner wall 17 of the main body 10 at the first flow section 203 is smaller than the cross-sectional area of the inner wall 17 of the main body 10 at the second flow section 201; the cross-sectional area of the outer wall 140 of the fan assembly 60 is smaller than the cross-section of the outer wall 150 of the heating assembly 50; the fan assembly 60 has a first axis parallel to the air flow direction in the first flow section 203; the heating assembly 50 has a second axis parallel to the gas flow direction in the second flow section 201; the first axis coincides with the second axis. As Figure 14a shown, the first axis coincides with the second axis on the axis of the main body 10.

[0183] In this embodiment, the diversion section 202 can be formed by adding a new component between the fan assembly 60 and the heating assembly 50; or by setting a diversion structure on the heating assembly 50, or by setting a diversion structure on the fan assembly 60, etc. The following will be described in detail respectively.

[0184] The scheme of forming the diversion section by setting a diversion structure on the heating assembly: Refer to Figure 14a , 14b and Figure 15 shown, a diversion structure 152 is provided at one end of the heating assembly 50 close to the fan assembly 60; a section of space between the diversion surface 1521 of the diversion structure 152 and the inner wall of the main body 10 is the diversion section 202.

[0185] More specifically, the heating assembly 50 includes a fixing member 153 and a heating member 154. Among them, the diversion structure 152 is provided at one end of the fixing member 153 close to the fan assembly 60; the heating member 154 surrounds the outer periphery of the fixing member 153.

[0186] As Figure 14a , 14b and Figure 15 shown in the example, the diversion structure 152 is a frustum of a cone with a small end face facing the fan assembly 60 and a large end face facing away from the fan assembly 60; the inclined surface connecting the large end face and the small end face of the frustum of the cone is the diversion surface 1521.

[0187] Further, in order to reduce the weight of the whole hair dryer, as shown in the cross-sectional schematic diagram in Figure 14a and the three-dimensional schematic diagram in Figure 14b , the fixing member 153 is a cylindrical member with one end closed and the other end open; the diversion structure 152 is provided at the closed end of the fixing member 153. Here, the closed end of the fixing member 153 faces the fan assembly 60, and the purpose is to prevent air flow from entering the hollow inner cavity of the cylindrical member of the fixing member 153.

[0188] Further, the heating component 154 includes: a support member 1541 and a heating wire 1542. Among them, the support member 1541 is disposed on the outer wall of the fixing member 153 and extends from the closed end to the open end of the fixing member 153; the heating wire 1542 is wound around the support member 1541. Specifically, see Figure 3 As shown, the support member 1541 includes a plurality of mica sheets with different heights. The mica sheets are arranged at intervals of different heights on the outer wall of the fixing member. The first layer of heating wire 15422 is wound around the short mica sheets, and the second layer of heating wire 15421 is wound around the tall mica sheets.

[0189] The solution for forming the drainage section by setting the drainage structure on the heating assembly: See Figure 16 As shown in the schematic diagram, the drainage structure 152 is provided at one end of the fan assembly 60 close to the heating assembly 50; a section of space between the drainage surface 1521 of the drainage structure 152 and the inner wall 17 of the main body 10 is the drainage section 202.

[0190] In a specific embodiment, the fan assembly 60 includes: a motor housing 140, a motor (not shown in the figure), and a fan 141. Among them, the motor housing 140 has opposite first and second ends; the motor is accommodated in the motor housing 140, and the power output end extends from the first end of the motor housing 140; the fan 141 is connected to the power output end of the motor to rotate under the drive of the motor. Among them, the drainage structure 152 is provided at the second end of the motor housing 140. Further, the drainage surface 1521 is an inclined surface extending from the second end of the motor housing 140 towards the heating assembly 50.

[0191] The solution for forming the drainage section by setting the drainage structure between the heating assembly and the fan assembly: Similar to the above Figure 16 shown embodiment. The drainage structure 152 has an inclined drainage surface 1521 pointing from the air outlet side of the fan assembly 60 to the heating assembly 50. The drainage structure 152 can be a structure inside the cavity of the main body 10, not connected to any one of the fan assembly 60 and the heating assembly 50, and can be in contact or have a certain gap.

[0192] As Figure 14a and 14b shown, air enters from the first air inlet 11 of the air flow channel, is accelerated by the fan assembly 60, heated by the heating assembly 50, and then discharged from the first air outlet 12 of the air flow channel. Due to the rotation of the fan 141 in the fan assembly 60 and the high-speed air flow movement inside the main body 10 of the hair dryer, relatively large noise will be generated. During specific implementation, a sound absorption component 90 can be added in the air flow channel, see Figure 17 shown.

[0193] Specifically, the sound-absorbing component 90 can be arranged between the heating component 50 and the blower component 60. The sound-absorbing component 90 includes a porous sound-absorbing cover 91. Refer to Figure 18 As shown, the porous sound-absorbing cover 91 is a cover body with openings at both ends, and the opening diameter of its first end is smaller than that of the second end. The surface of the cover body of the porous sound-absorbing cover 91 is parallel to the flow direction of the air flow in the diversion section. Refer to Figure 17 and Figure 18 In the specific example shown, the first end of the porous sound-absorbing cover 91 is connected to the blower component 60, and the second end faces the heating component 50. In an implementable technical solution, one end of the motor housing in the blower component 60 close to the heating component 50 is provided with a motor cover 142, and a porous sound-absorbing cavity is formed after the porous sound-absorbing cover 91 is assembled with the motor cover 142. During specific implementation, the sound-absorbing coefficient and frequency band of the porous sound-absorbing cover 91 can be adjusted through the pore diameter and porosity according to the spectral characteristics of the noise.

[0194] In order to further improve the sound-absorbing ability of the sound-absorbing component, the sound-absorbing component may further include a porous sound-absorbing material 92 filled in the air flow channel. Refer to Figure 18 As shown, a porous sound-absorbing material 92 is added into the cavity of the porous sound-absorbing cavity formed after the porous sound-absorbing cover 91 is assembled with the motor cover 142 to increase the sound-absorbing ability of the overall structure. When sound waves enter, part of the sound energy is dissipated as heat through friction in the pores of the porous material. The surface of the porous sound-absorbing cavity is parallel to the air flow direction, which does not affect the aerodynamic performance and there is no air flow regeneration noise; this structure can effectively reduce the noise in a specific frequency band area, thereby causing the overall noise to be reduced accordingly. During specific implementation, the porous sound-absorbing material can be sound-absorbing sponge.

[0195] It should be supplemented here that: the porous sound-absorbing cavity can fill the cross-section of the air flow channel, that is, all the air flow coming out of the blower component enters the second flow section after passing through the porous sound-absorbing cavity; of course, the porous sound-absorbing cavity can also not fill the cross-section of the air flow channel, that is, part of the air flow coming out of the blower component enters the second flow section after passing through the porous sound-absorbing cavity, and the other part directly enters the second flow section.

[0196] Figure 19 The external view of the hair dryer provided by the embodiment of the present application is shown. As Figure 19As shown, the hair dryer includes a main body 10, a handle 40, an air inlet grille 600, and an exposed component 700. The air inlet grille 600 is disposed at a first air inlet 11 of the air flow channel; the exposed component 700 is located on the air inlet side of the air inlet grille 600; wherein, there is a gap for air flow between the exposed component 700 and the air inlet grille 600. Air flows into the gap from the edge of the exposed component 700 and then into the air inlet grille 600, which helps to reduce noise. The user can hold the hair dryer through the handle 40 for blowing, and a control unit 218 is provided on the handle 40 (see Figure 10 , 11 and 12), and the control unit 218 may include: a main control switch 2181, a mode selection switch 400. Among them, the mode selection switch 400 may further include: a cold air mode selection switch 410, a high-power mode selection switch 420, etc., which are not specifically limited in this embodiment. A battery assembly is also provided inside the handle 40, and the battery assembly is electrically connected to the controller assembly. The battery assembly is configured to provide electrical energy for each component of the hair dryer, or the power cord 500 of the hair dryer passes through the handle 40 and is connected to the controller assembly, and the power cord 500 is connected to an external power supply to provide electrical energy for each component of the hair dryer.

[0197] Next, in combination with specific application scenarios, the technical solutions adopted in this embodiment will be described to help understanding. In the following application scenarios, a handheld hair dryer is taken as an example.

[0198] Application Scenario 7

[0199] When the user needs to use the hair dryer, turn on the hair dryer. At this time, the fan assembly of the hair dryer works to form a negative pressure in the air flow channel to suck in external air. The air enters the air flow channel and passes through the first flow section, and obliquely flows into the second flow section under the action of the diversion section; due to the existence of the diversion section, the air flow will not directly impact the windward surface formed by the step drop because of the step drop between the first flow section and the first flow section. The user can feel that the noise of the hair dryer is relatively low during use, and the use experience is good.

[0200] Application Scenario 8

[0201] When the user needs to use the hair dryer, turn on the hair dryer. At this time, the fan assembly of the hair dryer works to form a negative pressure in the air flow channel to suck in external air. The air enters the air flow channel and passes through the first flow section, and obliquely flows into the second flow section under the action of the diversion section; due to the existence of the diversion section, the air flow will not directly impact the windward surface formed by the step drop because of the step drop between the first flow section and the first flow section. In addition, since a sound absorption component is provided in the air flow channel, part of the sound waves generated by the air flow are dissipated as heat energy through friction in the pores after entering the pores of the sound absorption component; the user can feel that the hair dryer has low noise and good use experience during use.

[0202] Continue to refer to Figure 19 、 20 and the example shown in 21. Figure 19 The side view of the hair dryer provided by an embodiment of the present application; Figure 20 The rear view of the hair dryer provided by an embodiment of the present application; Figure 21 The axonometric view of the hair dryer provided by an embodiment of the present application. Refer to Figure 19 、 20 As shown in 21, the hair dryer provided by this embodiment includes: a main body 10, an air inlet grille 600, and an exposed component 700. Among them, the main body 10 has an air flow channel (not shown in the figure); the air inlet grille 600 is located at the end of the main body, and air enters the air flow channel through the air inlet grille; the exposed component 700 is located on the air inlet side of the air inlet grille 600; wherein, there is a gap for air flow between the exposed component 700 and the air inlet grille 600.

[0203] The technical solution provided by the embodiment of the present application is to set an exposed component 700 on the air inlet side of the air inlet grille 600, and there is a gap for gas flow between the exposed component 700 and the air inlet grille 600; the air flow will not directly pass through the air inlet grille 600 and enter the air flow channel, but first enter the gap between the exposed component 700 and the air inlet grille 600, and then pass through the air inlet grille 600 to the air flow channel, which helps to reduce noise; in addition, the technical solution provided by the embodiment of the present application also avoids the problem that the entire air inlet grille 600 is exposed outside, and the appearance of the hair dryer is more beautiful.

[0204] Refer to Figure 19 and Figure 23 As shown, the exposed component 7000 protrudes on the air inlet surface where the air inlet grille 600 is located, so that the gap includes a first gap D in the plane direction of the air inlet surface and a second gap L in the normal direction of the air inlet surface. The air flow enters the gap from the edge of the exposed component 700, and then passes through the air inlet grille 600 and enters the air flow channel of the main body 10. The air flow enters the gap from the edge of the exposed component 700 and then enters the air inlet grille 600, which helps to reduce noise.

[0205] In a feasible embodiment of the present application, refer to Figure 19 and Figure 23, An achievable way of the main body 10 in the embodiments of the present application is that the main body 10 includes a housing. Various functional components of the hair dryer are arranged in the cavity of the housing. A first air inlet 11 and a first air outlet 12 are arranged on the housing. An air inlet grille 600 is arranged at the first air inlet 11. The components arranged inside the housing include, but are not limited to, a controller assembly 130, a heating assembly 50, a fan assembly 60, etc. that are connected to the controller assembly 130. The fan assembly 60 includes a motor that drives the fan and a fan that generates negative pressure by rotation. The fan assembly 60 is configured to form a negative pressure during operation to suck air from the first air inlet 11 into the air flow channel of the main body 10. After being heated by the heating assembly 50, it is blown out from the first air outlet 12. A handle 40 is also arranged on the main body 10. The user can hold the hair dryer through the handle 40 to blow air. Control keys connected to the control unit are arranged on the handle 40. Different functions of the hair dryer can be controlled by using the control keys. For example, the hair dryer can be controlled to blow air of different sizes. A battery assembly is also arranged inside the handle 40. The battery assembly is connected to the controller assembly 130. The battery assembly is configured to provide electrical energy for the components of the hair dryer, or the power cord 500 of the hair dryer passes through the handle 40 and is connected to the control unit. The power cord 500 is connected to an external power supply to provide electrical energy for the components of the hair dryer.

[0206] See Figure 20 and Figure 21 As shown, in the direction from the first air inlet 11 to the first air outlet 12 of the air flow channel, the exposed component 700 blocks at least part of the area of the air inlet grille 600.

[0207] Since the exposed component 700 blocks at least part of the area of the air inlet grille 600, it will inevitably affect the gas flow rate per unit time at the first air inlet 11. While reducing noise, the impact on the gas flow rate is minimized as much as possible. The exposed component 700 blocks part of the area of the air inlet grille 600. Specifically, as Figure 20 shown, the air inlet grille 600 has an end face 6001 facing the exposed component 700; the edge of the end face 6001 extends beyond the projection contour edge of the exposed component 700 on the end face 6001.

[0208] More specifically, along the perimeter of the edge of the end face 6001, the projection contour edge of the exposed component 700 on the end face 6001 maintains a fixed distance from the edge of the end face 6001. In specific implementation, this fixed distance (i.e., Figure 19 the gap D shown in the figure) can be a value within 2 to 8 millimeters, such as 5 millimeters. Due to the blocking effect of the exposed component 700, with the above design, gas can uniformly enter the air inlet grille 600 from the peripheral edge of the exposed component 700, and the air flow inlet path has a certain bend, which helps to reduce noise.

[0209] To ensure a certain air intake volume, the approximate air intake area of the hair dryer needs to be about 1,000 - 1,400 square millimeters. Due to the occlusion of the exposed component 700 in this embodiment, during implementation, the distance between the air intake grille and the exposed component can be adjusted to meet the above air intake area requirements. For example, as Figure 19 and Figure 23 shown, the distance between the edge of the exposed component 700 and the air intake grille 600 (i.e., the gap L shown in Figure 19 ) can be a value within 3 - 9 millimeters, such as 6 millimeters, 7 millimeters, etc.

[0210] In an actual scenario, dust will accumulate on the air intake grille 600 of the hair dryer due to long - term use. Excessive dust accumulation will affect the air intake volume of the first air inlet. Users need to regularly clean the air intake grille 600. To facilitate users to clean the air intake grille, the exposed component 700 in this embodiment can also be used as a holding part. The user can easily remove the air intake grille 600 from the main body 10 by holding the exposed component 700. That is, the exposed component 700 is connected to the air intake grille 600; the air intake grille 600 is detachably connected to the main body 10; the exposed component 700 serves as a holding part, and under the action of the disassembly force, drives the air intake grille 600 to be removed from the main body 10.

[0211] In the embodiment of the present application, the air intake grille 600 can be connected to the main body 10 in various ways. For example, the air intake grille 600 can be magnetically adsorbed on the main body 10, or connected to the main body 10 by threads, or connected to the main body 10 by snap - fits, etc. This embodiment does not make specific limitations on this.

[0212] Continuing to refer to Figure 22 shown, the exposed component 700 is connected to the central part 63 of the air intake grille 600; a plurality of ventilation holes 64 are evenly distributed around the central part 63. Further, the ventilation holes 64 are arc - shaped holes extending from the central part 63 along an arc to the edge of the air intake grille 600.

[0213] Referring to Figure 19 and Figure 23 shown, in order to make the air flow into the air intake grille 600 more smoothly, in the direction from the first air inlet 11 to the first air outlet 12, the cross - section of the exposed component 700 gradually decreases to form a guiding surface 71, so that the air flow flows into the air intake grille 600 along the guiding surface 71.

[0214] In an implementable technical solution, as Figure 22As shown, the exposed component 700 includes an exposed panel 72 and a drainage plate 73. Among them, the drainage plate 73 is located between the exposed panel 72 and the air inlet grille 600; a guiding surface 71 is provided on the drainage plate 73 to guide the air flow to enter from the outer edge of the drainage plate 73 and follow an arc path to the air inlet grille 600.

[0215] In the embodiment of the present application, the exposed component 700 and the air inlet grille 600 can be connected in a variety of connection ways, such as welding, screw connection, snap connection with a snap and a slot, etc.; or, the exposed component 700 and the air inlet grille 600 are an integrally formed structure.

[0216] Continue to refer to Figure 22 as shown, Figure 22 An exemplary connection way is shown, that is, a first structure 61 for positioning is provided on the end surface of the air inlet grille 600 facing the exposed component 700; the exposed component 700 maintains the positional relationship with the air inlet grille 600 through the first structure 61; after the positional relationship between the air inlet grille 600 and the exposed component 700 is fixed, they are connected by a connecting component 80.

[0217] More specifically, a connection through hole 62 is provided on the air inlet grille 600; on the end surface of the air inlet grille 600 facing the exposed component 700, positioning posts 611 are respectively provided at both ends of the hole diameter of the connection through hole 62; positioning holes 74 adapted to the positioning posts 611 and connection blind holes 75 corresponding to the position of the connection through hole 62 are provided on the exposed component 700 (as Figure 24 shown); the connecting component 80 penetrates through the connection through hole 62 and enters the connection blind hole 75 to connect the air inlet grille 600 and the exposed component 700.

[0218] Furthermore, as Figure 19 shown, the end surface of the air inlet grille 600 facing the exposed component 700 is an arc surface. Similarly, the end surface of the exposed component 700 facing away from the air inlet grille 600 can also be an arc surface. The arc surface design has two advantages. One is aesthetics, and the other is helpful for reducing the noise of the whole machine.

[0219] Furthermore, as Figure 23 shown, the main body 10 in this embodiment may further include a nozzle 230, and the nozzle 230 is detachably connected to the first air outlet 12 of the air flow channel of the main body 10. The nozzle 230 can concentrate the air flow blown out at the first air outlet 12 to meet the user's usage requirements in specific scenarios (such as when shaping hair).

[0220] The technical solution adopted by the present application will be described below in combination with specific application scenarios to facilitate understanding. In the following application scenarios, a handheld hair dryer is taken as an example.

[0221] Application Scenario 9

[0222] When the user needs to use the hair dryer, turn on the hair dryer. At this time, the fan assembly of the hair dryer works, creating a negative pressure in the air flow channel to suck in external air. The air flow at the rear of the hair dryer enters the gap between the exposed part and the air inlet grille, then passes through the air inlet grille into the air flow channel, and after being heated by the heating assembly, is blown out from the first air outlet 12. The air flow does not directly pass through the air inlet grille into the main body, which helps to reduce noise, and the user can feel that the noise of the hair dryer is relatively low and the use experience is good.

[0223] Application Scenario 10

[0224] When the user is using the hair dryer and finds that there is a lot of dust on the air inlet grille of the hair dryer. At this time, the user holds and rotates the exposed part, and the air inlet grille can be removed from the main body of the hair dryer. For the removed air inlet grille, the user can clean it by washing with water or using a brush. After cleaning, the user holds the exposed part, places the air inlet grille in the connection position, and then rotates the air inlet grille to install it on the main body.

[0225] When the inventor was using an existing hair dryer, when turning on the hair dryer to blow hair, after blowing for a while, it felt too hot or too cold; then went to look at the corresponding controls on the hair dryer to change the mode of the hair dryer by adjusting the controls. That is, for the existing hair dryer, the user experience is not good. In view of the above problems, the present application provides the following embodiments, and the user can judge whether the air blown out by the hair dryer is cold air or hot air without touching the air outlet.

[0226] Figure 25 It is a schematic structural diagram of a hair dryer provided in an embodiment of the present application. As Figure 25 shown, this embodiment provides a hair dryer, including: a main body 10 and an indication component 250. Among them, the end of the main body 10 has a first air inlet 11. The indication component 250 surrounds the end of the main body 10 and is electrically connected to the main body 10. Among them, the indication component 250 displays different indication marks in response to the air outlet temperature of the hair dryer.

[0227] For the technical solution provided in the embodiment of the present application, the indication component 250 electrically connected to the main body 10 can display different indication marks in response to different air outlet temperatures of the main body 10, so that the user can know the air outlet temperature of the main body 10 according to different indication marks. The user can judge the air outlet temperature according to different indication marks without touching the air outlet of the hair dryer. The method is simple and intuitive, avoiding potential harm to the user when the hair dryer blows out hot air.

[0228] In an implementable embodiment of the present application, refer to Figure 25 and Figure 26 , in an implementable manner of the main body 10 in the embodiment of the present application, the main body 10 includes a housing. Various functional components of the hair dryer are arranged in the cavity of the housing. A first air inlet 11 and a first air outlet 12 are arranged on the housing. An air inlet assembly 300 is arranged at the first air inlet 11. In a specific implementation, the air inlet assembly 300 may at least include: the exposed component 700 and the air inlet grille 600 as shown in Figure 19 . The components arranged inside the housing include but are not limited to a controller assembly 130, a heating component 50 connected to the controller assembly 130, a fan assembly 60, etc. The fan assembly 60 includes a motor for driving the fan and a fan that generates negative pressure by rotation. The fan assembly 60 is configured to form a negative pressure during operation to suck air into the main body 10 from the first air inlet 11, and after being heated by the heating component 50, it is blown out from the first air outlet 12. A handle 40 is also arranged on the main body 10. The user can hold the hair dryer through the handle 40 to blow air. Control buttons connected to the controller assembly 130 are arranged on the handle 40. By using the control buttons, the hair dryer can be controlled to perform different functions. For example, the hair dryer can be controlled to blow air of different sizes. A battery assembly is also arranged inside the handle 40. The battery assembly is connected to the controller assembly 130. The battery assembly is configured to provide electrical energy for other components, or the power cord of the hair dryer passes through the handle 40 and is connected to the controller assembly 130, and the power cord is connected to an external power source to provide electrical energy for other components.

[0229] In the embodiment of the present application, the indication assembly 250 can be arranged at different positions on the main body 10 so that the user can conveniently and intuitively see the indication mark. For example, on the side of the main body 10, on the side of the main body 10 away from the handle 40, or the indication assembly 250 can also be arranged on the handle 40. In an implementable embodiment, the indication assembly 250 is in a ring structure, and the air flow entering through the first air inlet 11 can pass through the ring structure. The indication assembly 250 in the ring structure can save space, and other components of the hair dryer can be arranged inside the ring structure. For example, the fan assembly 60 can be arranged, and the ventilation channel of the hair dryer can pass through the ring structure. At the same time, the indication assembly 250 in the ring structure has a wide range for displaying the indication mark. When the user uses the hair dryer, the user often changes various angles to blow the hair. By adopting the indication assembly 250 in the ring structure, the user can conveniently observe the indication mark at various angles.

[0230] At the same time, the air flow entering through the first air inlet 11 can pass through the ring structure, and the air flow entering through the first air inlet 11 can blow over the ring structure, thereby taking away the heat generated when the indication assembly 250 works and improving the service life of the indication assembly 250.

[0231] Furthermore, the outer surface of the indicator component 250 is flush with the outer surface of the main body 10. From the appearance, the indicator component 250 and the main body 10 are viewed as a whole, making the overall appearance of the hair dryer more beautiful. At the same time, the indicator component 250 does not protrude from the outer surface of the main body 10, avoiding excessive wear of the indicator component 250 and increasing the service life of the indicator component 250.

[0232] Further, in an achievable embodiment of the present application, the outer surface of the indication component 250 includes at least two light emitting surfaces, wherein at least one light emitting surface extends along the normal direction of the first air inlet 11, and at least one light emitting surface extends along the circumferential direction around the main body 10. When the indication component 250 is displayed, it can be displayed in at least two directions, and the user can view the indication along the normal direction of the first air inlet 11 and the circumferential direction of the main body 10, which is convenient for the user to view without adjusting the angle, and is convenient for the user to use.

[0233] In the embodiment of the present application, one possible implementation of the indication component 250 is: Figures 26 to 28 , the indicating assembly 250 includes a lamp board 210. The lamp board 210 includes but is not limited to a ring structure. The lamp board 210 includes a PCB (Printed Circuit Board) board and an LED (Light Emitting Diode) light source arranged on the PCB board. The PCB board is electrically connected to the main body 10, and the main body 10 provides power for the lamp board 210. The lamp board 210 can be arranged on the surface of the main body 10, or a light-transmitting hole is arranged on the main body 10, and the lamp board 210 can emit light outward through the light-transmitting hole. The indicating mark of the indicating assembly 250 includes but is not limited to the color of the light emitted by the LED light source. For example, when the light is blue, it means that the main body 10 blows out cold air. When the light turns to red, it means that the main body 10 blows out hot air. Alternatively, the light has a gradual change process. When the light is blue, it means that the main body 10 blows out cold air. When the color of the light gradually turns to red, it means that the air blown out by the main body gradually becomes hotter. When the air outlet temperature exceeds a certain temperature, the light stops changing and stays in red. The indicator mark of the indicator component 250 can also indicate different outlet air temperatures by lighting up light sources at different positions. For example, multiple LED light sources are arranged in a circle, and different outlet air temperatures are indicated when light sources at different positions are lit. The indicator mark of the indicator component 250 can also indicate different outlet air temperatures by lighting up different numbers of light sources. For example, the fewer the number of light sources that are lit, the lower the outlet air temperature. It should be noted that the implementation method of the indicator mark of the indicator component 250 described above can be implemented separately or in combination with each other, and the embodiments of the present application do not make specific limitations.

[0234] In order to make the light emission of the lamp board 210 more uniform, in the embodiment of the present application, continue to refer to Figures 26 to 30 , the indicating component 250 further includes a light guide 220. The light guide 220 includes, but is not limited to, an annular structure. The light guide 220 can conduct the light of the lamp board 210 and make the light more uniform, increasing the quality sense of the product. It should be noted that the light guide 220 being an annular structure means that the overall shape of the light guide 220 is a ring structure matching the lamp board 210. To achieve the conduction of light, one possible implementation of the light guide 220 is that the light guide 220 has an abutting portion 221 and a light guiding portion 222. The abutting portion 221 abuts against the lamp board 210, and the light guiding portion 222 extends a certain length along the longitudinal direction of the main body 10. One end of the light guiding portion 222 is connected to the abutting portion 221, and the other end has a light emitting surface. To match the annular structure of the lamp board 210, the abutting portion 221 is an annular structure matching the shape of the lamp board 210, and the light guiding portion 222 can be understood as a cylindrical structure. The abutting portion 221 and the light guiding portion 222 can be an integrally formed structure.

[0235] The light guide 220 is made of a light diffusing material or a fully transparent material. For example, it is made of a light diffusing or fully transparent PC (Polycarbonate) material. In the case of having the light guide 220, the lamp board 210 can be not only disposed on the surface of the main body 10, but also disposed inside the main body 10, and the light emitted by the lamp board 210 is conducted to the surface of the main body 10 through the light guide plate. One possible implementation is that the indicating component 250 includes a lamp board 210 and a light guide 220, and both the lamp board 210 and the light guide 220 are annular structures. Here, the light guide 220 being an annular structure can also be understood as the light guide 220 being a cylindrical structure. At the end with the first air inlet 11, an annular receiving cavity 135 is provided inside the main body 10. The lamp board 210 is located in the receiving cavity 135 and is electrically connected to the main body 10. One end of the light guide 220 extends into the receiving cavity 135 to abut against the lamp board 210, and the other end extends out of the receiving cavity 135 to the indicating area of the main body 10. The indicating area includes, but is not limited to, the outer surface of the end of the main body having the first air inlet 11. The light emitted by the lamp board 210 enters the light guide 220 from one end of the light guide 220, and after being conducted by the light guide 220, it is emitted from the other end of the light guide 220, so that the light is emitted from the outer surface of the main body 10.

[0236] Both the lamp board 210 and the light guide 220 are annular structures, which can effectively save the internal space of the hair dryer. The inside of the annular structure can be used to arrange other components of the hair dryer, such as arranging the fan assembly 60. The ventilation channel of the hair dryer can pass through the annular structure. The airflow entering through the first air inlet 11 can pass through the annular structure, and the airflow entering through the first air inlet 11 can blow over the annular structure, thereby taking away the heat generated when the indicating component 250 works and increasing the service life of the indicating component 250. At the same time, the light guide 220 with an annular structure has a wide range for displaying the indicating logo. When the user uses the hair dryer, the user often changes various angles to blow the hair. Using the light guide 220 with an annular structure can facilitate the user to observe the indicating logo conveniently from various angles.

[0237] Further, to protect one end of the light guide 220 extending out of the receiving cavity 135, a decorative cover 23 is covered on the outer periphery of one end of the light guide 220 located on the outer surface of the main body 10. On the one hand, the decorative cover 23 can protect the light guide 220, and on the other hand, the decorative cover 23 can further play a role in guiding light, making the light more uniform. The decorative cover 23 can be designed according to the appearance of the main body 10, so that the overall appearance of the hair dryer is more beautiful. For example, the receiving cavity 135 is located inside the end of the main body 10 having the first air inlet 11. The receiving cavity 135, the lamp board 210, the light guide 220 and the decorative cover 23 are all annular structures. The main body 10 is a cylindrical structure. The receiving cavity 135 is arranged along the circumferential direction of the main body 10. The annular lamp board 210 is arranged in the receiving cavity 135. The light guide 220 and the decorative cover 23 both surround the main body 10 for one circle. During use, the lamp board 210 emits light, and the light is transmitted to the decorative cover 23 through the light guide 220. An aperture can be seen on the outer surface of the main body 10 from the appearance of the main body 10. According to the different colors of the aperture, it can be judged whether the hot air or the cold air is blown out by the hair dryer. The aperture surrounds the outer periphery of the main body 10 for one circle, which is convenient for the user to watch. Different from the existing ones, the angle can be adjusted, and then it can be seen, which is convenient for the user to use.

[0238] Further, refer to Figure 29 and Figure 30, in the embodiment of the present application, the side of the light board 210 facing the light guide 220 has a plurality of lamp beads, and the plurality of lamp beads are annularly distributed on the light board 210. The light guide 220 includes an abutting portion 221 and a light guiding portion 222 provided on the abutting portion 221. The abutting portion 221 abuts against the light board 210, and a plurality of grooves 2211 are provided on the abutting portion 221, and at least one of the lamp beads is received in each groove 2211. The light guiding portion 222 extends out of the accommodating cavity 135 to the indicating area of the main body 10. The indicating area includes, but is not limited to, the outer surface of the end of the main body having the first air inlet 11. Wherein, the light board 210 is located in the accommodating cavity 135, and the abutting portion 221 of the light guide 220 is used to abut against the light board 210. Therefore, the abutting portion 221 needs to extend into the accommodating cavity 135 to abut against the light board 210. The light guiding portion 222 of the light guide 220 needs to conduct the light emitted by the light board 210 to the outer surface of the main body 10. Therefore, the light guiding portion 222 needs to extend out of the accommodating cavity 135 to the outer surface of the main body 10. At the same time, the part of the light guiding portion 222 extending to the outer surface of the main body 10 is flush with the outer surface of the main body 10, so that the light guiding portion 222 does not protrude from the outer surface of the main body 10, avoiding excessive wear of the light guiding portion 222 and improving the service life of the light guiding portion 222.

[0239] The outer surface of the light guiding portion 222 includes at least two light emitting surfaces. Among them, at least one light emitting surface extends along the normal direction of the first air inlet 11, and at least one light emitting surface extends along the circumferential direction around the main body 10. When the light guiding portion 222 displays the indicating sign, it can display at least in two directions. The user can view the indicating sign along the normal direction of the first air inlet 11 and the circumferential direction of the main body 10, which is convenient for the user to view without adjusting the angle and convenient for the user to use.

[0240] The grooves 2211 on the abutting portion 221 can act as a lens. The light emitted by the lamp beads can be more concentrated through the refraction of the grooves 2211, and then conducted to the outer surface of the main body 10 through the light guiding portion 222. The light is more uniform when emitted from the light guiding portion 222, avoiding the situation of darker light output. The end of the light guiding portion 222 away from the abutting portion 221 is in a undulating structure, which can improve the connection strength with the decorative cover 23 and increase the aesthetics at the same time.

[0241] Furthermore, the groove 2211 includes, but is not limited to, a hemispherical structure. It should be noted that the shape of the groove 2211 can be set according to different light output requirements. In the embodiment of the present application, it is not limited that the groove 2211 is only a hemispherical structure. The groove 2211 can also be other shapes, such as an elliptical structure, a saddle-shaped structure, an 8-shaped structure, etc.

[0242] In the embodiments of the present application, the light guide 220 can be connected to the main body 10 in various ways. One possible way is to continue referring to Figure 29 and Figure 30 , a plurality of first engaging portions 223 are provided on the abutting portion 221 and / or the light guiding portion 222, and a plurality of second engaging portions are provided at positions corresponding to the first engaging portions 223 in the receiving cavity 135. The first engaging portion 223 is connected to the second engaging portion so that the light guide 220 is connected in the receiving cavity 135. The first engaging portion 223 includes, but is not limited to, a protrusion, and the second engaging portion includes a groove 2211 that cooperates with the protrusion. Or the first engaging portion 223 is a groove 2211 and the second engaging portion is a protrusion. The installation position of the light guide 220 can be fixed through the first engaging portion 223 and the second engaging portion, and the light guide 220 can be simply and quickly installed on the main body 10.

[0243] Further, continue referring to Figure 29 and Figure 30 , to prevent the light intensity from weakening when the light emitted by the lamp board 210 is conducted through the light guide 220, in the embodiments of the present application, a light shielding layer 224 covers a part of the surfaces of the abutting portion 221 and the light guiding portion 222. The light shielding layer 224 can be provided on the surfaces of the light guide 220 that do not require light input and output, so that light cannot be transmitted through the part with the light shielding layer 224 and can only be transmitted through the part without the light shielding layer 224. For example, the light shielding layer 224 can be provided on the remaining areas of the abutting portion 221 except for the groove, and on the areas of the light guiding portion 222 except for the light output surface. When the light guide 220 transmits light, the light can only propagate along the set optical path, avoiding light divergence and weakening of the light intensity. To prevent the light shielding layer 224 from absorbing light, the light shielding layer 224 can be made of a reflective material. The reflective material is coated on the light guide 220 to form the light shielding layer 224, and the side of the light shielding layer 224 facing the inside of the light guide 220 can reflect light to prevent light absorption. The reflective material includes, but is not limited to, aluminum.

[0244] Next, in combination with a specific application scenario, the technical solution adopted by the present application will be described to help understanding. In the following application scenario, the hair dryer is a handheld hair dryer and the indication mark is a light.

[0245] Application Scenario 11

[0246] When the user needs to use the hair dryer, turn on the hair dryer. At this time, the user does not need to touch the air outlet of the hair dryer with their hands. Just by observing the color of the light of the indication component on the hair dryer, the user can determine whether the air blown out by the hair dryer is cold air or hot air.

[0247] When the light is blue, it means that the air blown out by the main body is cold air. When the light turns red, it means that the air blown out by the main body is hot air.

[0248] Application Scenario 12

[0249] When the user needs to use the hair dryer, turn on the hair dryer. At this time, the user does not need to touch the air outlet of the hair dryer with their hands. Just by observing the color of the light of the indicating component on the hair dryer, the user can determine whether the air blown out by the hair dryer is cold air or hot air.

[0250] When the light is blue, it means that the air blown out by the main body is cold air. When the light gradually changes from blue to red, it indicates that the air blown out by the main body is gradually getting hotter. When the air outlet temperature exceeds a certain temperature, the light stops changing and stays red. When the light turns red, it means that the air blown out by the main body is hot air.

[0251] Figure 31 Schematic diagram of the internal structure of the handle of the hair dryer provided by an embodiment of the present application. Please refer to the attached Figure 19 、 20 As shown in FIGS. 21 and 31, the hair dryer provided in this embodiment includes: a main body 10 and a handle 40. It should be noted that in the embodiments of the present application, the hair dryer is a handheld hair dryer.

[0252] The main body 10 has a first air inlet 11 and a first air outlet 12. The main body 10 may include a housing. Various functional components of the hair dryer are arranged in the inner cavity surrounded by the housing. The first air inlet 11 and the first air outlet 12 are arranged on the housing. The functional components arranged inside the housing include, but are not limited to, a controller assembly 130 and a heating assembly 50, a fan assembly 60, etc. connected to the controller assembly 130. Specifically, as mentioned above, the controller assembly 130 may include a main control board. The fan assembly 60 includes a motor for driving the fan and a fan for generating negative pressure by rotation. The fan assembly 60 is configured to form a negative pressure during operation to suck air from the first air inlet 11 into the main body 10, and after being heated by the heating assembly 50, it is blown out from the first air outlet 12.

[0253] The handle 40 is connected to the main body 10. The extending direction of the handle 40 may be perpendicular to the connecting line direction of the first air inlet 11 and the first air outlet 12. As a preferred method, the handle 40 can also rotate relative to the main body 10 so that the handle 40 can be switched between a folded position and an unfolded position to facilitate the storage of the hair dryer.

[0254] In this embodiment, preferably, the handle 40 of the hair dryer in this embodiment can be cylindrical. The cylindrical handle 40 is convenient for the user to hold, has a good feel, and also has a good aesthetic degree.

[0255] A first switch and a second switch are provided on the handle 40. The operation surface of the first switch is perpendicular to the connecting line of the first air inlet 11 and the first air outlet 12 (as Figure 19The first switch is a dash-dot line) and faces the first air inlet 11, and the operating surface of the second switch is parallel to the line connecting the first air inlet 11 and the first air outlet 12. The first switch and the second switch in this embodiment can be any function selection switches, which are not limited in this embodiment. Hereinafter, taking the first switch as the main control switch 2181 and the second switch as the mode selection switch 400 as an example, the structure and functions of the hair dryer in this embodiment will be described. Among them, the main control switch 2181 is used to control the startup or shutdown of the hair dryer, and the mode selection switch 400 is used for the user to select the working mode of the hair dryer.

[0256] Generally speaking, for mainstream users, according to the user's holding habit, the user holds the handle 40 of the hair dryer with the right hand, holds the hair dryer and blows the hair towards the head. The first air outlet 12 is located on the left side of the main body 10, and the first air inlet 13 is located on the right side of the main body 10. Looking down at the handle 40 from top to bottom, the user holds the handle 40 with four fingers counterclockwise, the thumb abuts against the side of the handle 40 close to the first air inlet 13, and the end parts of the free ends of the remaining four fingers are located on the side of the handle 40 facing the user. Taking the first switch as the main control switch 2181 and the second switch as the mode selection switch 400 as an example, the main control switch 2181 is arranged on the side of the handle 40 facing the first air inlet 11, and the mode selection switch 400 is located on the side of the handle 40 facing the user, that is, the operating direction of the operating surface of the mode selection switch 400 is perpendicular to the line connecting the first air inlet 11 and the first air outlet 12. The first switch and the second switch are separately arranged, with a reasonable layout, in line with the user's usage habits and convenient to operate.

[0257] It should be noted that the operating surfaces of the first switch and the second switch refer to the surfaces of the switches that the finger pads contact when the user operates the switches.

[0258] In addition, for the convenience of description, the following descriptions will all be made with the first switch as the main control switch and the second switch as the mode selection switch to more clearly express the effects of this technical solution. Those skilled in the art can understand that the designer can set the first switch and the second switch as other function switches according to needs, which are not limited in this embodiment. In this embodiment, the distance from the main control switch 2181 to the main body 10 can be 24 mm to 30 mm. More preferably, the distance from the main control switch 2181 to the main body 10 is 27 mm. Through continuous experiments and calculations, the inventor selected 27 mm as the most suitable distance between the main control switch 2181 and the main body 10. In this way, when the user's hand is held upwards to the maximum extent and the thumb is held under the switch, it will not touch the main control switch 2181 and cause an uncomfortable feeling. When the thumb is cocked, it can just touch the main control switch 2181, which is convenient, fast and comfortable to operate.

[0259] Further, the master switch 2181 can be a push button. The master switch 2181 has two switching positions, the OFF position (closed position) and the ON position (start position). The ON position can be located above the OFF position. When in use, the user pushes the master switch 2181 upward, causing the master switch 2181 to switch to the ON position and the hair dryer to start. When the user pushes the master switch 2181 downward, the master switch 2181 switches to the OFF position and the hair dryer turns off. Of course, in other embodiments, the ON position can be located below the OFF position. When in use, the user pushes the master switch 2181 downward, causing the master switch 2181 to switch to the ON position and the hair dryer to start. When the user pushes the master switch 2181 upward, the master switch 2181 switches to the OFF position and the hair dryer turns off. Since the user's thumb is in a vertical position when holding the handle 40, in this embodiment, the master switch 2181 is designed as a push button form, which better conforms to the human hand structure, is more conducive to thumb operation, and conforms to the user's operation habits.

[0260] In addition, for ease of operation, the outer surface of the master switch 2181 has anti-slip protrusions to facilitate the user to operate the master switch 2181 more easily.

[0261] Optionally, in this embodiment, the position where the master switch 2181 is located and the position where the mode selection switch is located can be perpendicular to each other. The overall appearance of the hair dryer is more regular and beautiful.

[0262] The number of mode selection switches is not limited, which is specifically related to the function settings of the hair dryer. The user can select different modes for the hair dryer to work by triggering different mode selection switches, which conforms to the intelligent selection function of the hair dryer and can flexibly meet the user's needs.

[0263] Specifically, in this embodiment, there may be two mode selection switches 400, and the main control switch 2181 may be equidistant from the two mode selection switches 400, so that the connection lines between the main control switch 2181 and the two mode selection switches 400 can form an isosceles triangle. The distance between the two mode selection switches may be 13 mm to 19 mm. In this embodiment, preferably, the distance between the two mode selection switches is 16 mm. Through experiments, the inventor found that when the distance between the two mode selection switches is 16 mm, when the user operates with one hand, it can avoid accidental touch and the inconvenience caused by the two switches being too far apart. The hair dryer provided in the embodiment of the present application includes a main body and a handle. The main body has a first air inlet and a first air outlet. The handle of the hair dryer is provided with a first switch and a second switch. The operation surface of the first switch faces the first air inlet, and the operation direction of the operation surface of the second switch is perpendicular to the connection line between the first air inlet and the first air outlet. So that when the user holds the handle, the thumb can just touch the first switch, and the first switch is operated by the thumb, while the free ends of the four fingers can just touch the second switch, and the second switch is selected by the four fingers, which is convenient for operation, conforms to the user's operation habit, realizes function partitioning, has a reasonable layout, prevents misoperation, and can effectively improve the user experience.

[0264] Specifically, as Figure 19 shown, the first air outlet 12 may be located on the left side of the mode selection switch 400, and the first air inlet 11 is located on the right side of the mode selection switch 400. It should be noted that generally when a user holds the hair dryer, it is held with the right hand. In this way, when the user holds the hair dryer, in the state of holding the hair dryer with the right hand, the mode selection switch 400 is located on the handle 40 side visible to the user. Therefore, it is convenient for the user to select and operate, without having to turn the hair dryer over to select the mode selection switch 400 and then use it normally, which is convenient for operation and has a good user experience.

[0265] Figure 32 is the control schematic diagram of the hair dryer provided by the embodiment of the present application. As Figure 32As shown, in this embodiment, a controller assembly 130, a heating assembly 50 electrically connected to the controller assembly 130, and a blower assembly 60 may be provided inside the main body 10. It should be noted that in the embodiments of the present application, in order to enable the controller assembly 130 to control the heating assembly 50 and the blower assembly 60, a control circuit for controlling the working states of the heating assembly 50 and the blower assembly 60 may be provided on the controller assembly 130. Through this control circuit, the controller assembly 130 can control the blower assembly 60 in multiple working states. For example, the controller assembly 130 can control the start and stop of the blower assembly 60, and by controlling the power of the motor driving the fan, different rotation speeds can be controlled to achieve different wind forces blown by the blower assembly 60, and control the blower assembly 60 to blow strong wind, gentle wind and other states. Of course, the control of the wind force is not limited to strong wind and gentle wind, and various wind forces can be controlled according to different requirements. The controller assembly 130 can also control the heating assembly 50 in multiple working states. For example, the controller assembly 130 can control the start and stop of the heating assembly 50, and by controlling the current passing through the heating assembly 50, the heating assembly 50 can output at the maximum power, and control the temperature of the heating assembly 50, so as to achieve states such as the blown air becoming hot air, slightly hot air, etc., so that the hair dryer works in different working modes.

[0266] It should be noted that when only the main control switch 2181 is triggered to start the hair dryer, the hair dryer can be in a preset default working mode. For example, the heating assembly 50 is in a slightly hot air state, and the blower assembly 60 is in a gentle wind state. If the user needs to change this working mode, the current working mode of the hair dryer can be changed by triggering different mode selection switches. Of course, it can be understood that the default working mode of the hair dryer is not limited to the above description, and those skilled in the art can set it specifically according to the actual situation. This embodiment is only for illustration.

[0267] Based on the above embodiment, specifically, the mode selection switch 400 may include a cold air mode selection switch 410. The cold air mode selection switch 410 may be electrically connected to the controller assembly 130, and is used to control the heating assembly 50 not to generate heat when the cold air mode selection switch 410 is closed. It should be noted that the closing method of the cold air mode selection switch 410 can be a pressing method. The cold air mode selection switch 410 can be a push switch. After the user presses the cold air mode selection switch 410, the controller assembly 130 receives this signal, so as to control the heating assembly 50 not to generate heat. The specific method of controlling the heating assembly 50 not to generate heat can be to cut off the circuit connected to the heating assembly 50, or control the current of the heating assembly 50 to be zero. At this time, the wind force of the blower assembly 60 can remain unchanged, that is, the wind force in the default working mode, and only make the hair dryer blow cold air to meet the user's need to dry hair with cold air in hot weather.

[0268] The mode selection switch 400 may further include a high-power mode selection switch 420. The high-power mode selection switch 420 is electrically connected to the controller assembly 130. When the high-power mode selection switch 420 is closed, the controller assembly 130 controls the blower assembly 60 to switch to the maximum power operation, and controls the heating assembly 50 to generate heat at the maximum power. It should be noted that the closing method of the high-power mode selection switch 420 may be a pressing method. The high-power mode selection switch 420 may be a push switch. After the user presses the high-power mode selection switch 420, the controller assembly 130 receives the signal, thereby controlling the motor of the blower assembly 60 to operate at the maximum power, so that the fan can rotate at the maximum speed and blow out the maximum wind force, while controlling the heating assembly 50 can pass the maximum current, so that the heating assembly 50 generates heat at the maximum power, and the hair dryer blows out the hottest air to meet the user's need for quick hair drying.

[0269] For the hair dryer in the prior art, when the user needs to adjust the temperature as required, the user needs to frequently manually adjust the temperature according to the perception, and the number of operations required is too many, and the user experience is insufficient. In this embodiment, replacing the temperature control switch in the prior art with the mode selection switch 400 can effectively reduce the number of times the user presses the switch. The mode selection switch 40 can be adjusted in place with one operation, which can effectively improve the user experience.

[0270] The cold air mode selection switch 410 and the high-power mode selection switch 420 may be vertically arranged along the extending direction of the handle 40. Specifically, the cold air mode selection switch 410 may be located above the high-power mode selection switch 420, or the cold air mode selection switch 410 may be located below the high-power mode selection switch 420. When the distance between the cold air mode selection switch 410 and the high-power mode selection switch 420 is 16 mm, and the distance between the master control switch 2181 and the main body 10 is 27 mm, the distance between the mode selection switch located above and the main body 10 is 19 mm, while the distance between the mode selection switch located below and the main body 10 is 35 mm.

[0271] The number of mode selection switches in this embodiment may also be multiple. Those skilled in the art can add various intelligent selections according to the number of mode selection switches to meet the user's needs for various hair drying methods. This embodiment will not list them one by one.

[0272] In addition, as Figure 19 shown, an indicator light may also be provided on the front wall 2100 of the handle 40. The indicator light may be electrically connected to the controller assembly 130. When the controller assembly 130 controls the hair dryer to be in different working modes, the indicator light may emit light in different states.

[0273] Specifically, for example, the indicator light can be displayed in different colors and / or illuminated at different brightnesses, or, if there are multiple indicator lights, the more indicator lights that illuminate, the greater the wind force blown out. Specifically, when the hair dryer is started, the indicator light can emit yellow light by default, when the cold wind mode selection switch 410 of the hair dryer is triggered, the indicator light can emit green light, and when the high-power mode selection switch 420 of the hair dryer is triggered, the indicator light can emit red light. At the same time, the luminous intensity of the indicator light can be changed according to the wind force of the hair dryer. When there are multiple indicator lights, for example, there are three vertically arranged indicator lights, when the hair dryer has the lowest wind force, only one indicator light can be illuminated, when the wind force is medium, two indicator lights can be illuminated, and when the hair dryer has the highest wind force, all three indicator lights can be illuminated.

[0274] Furthermore, a battery assembly is also provided in the handle 40, and the battery assembly is connected to the controller assembly 130. The battery assembly is configured to provide electrical energy to the controller assembly 130, the heating assembly 50 and the fan assembly 60, or the power cord 500 of the hair dryer passes through the handle 40 and is connected to the controller assembly 130, and the power cord is connected to an external power source to provide electrical energy to the controller assembly 130, the fan assembly 60 and the heating assembly 50.

[0275] The technical solution adopted in this application is described below in combination with specific application scenarios to help understanding. In the following application scenarios, a hair dryer is taken as an example as a handheld hair dryer.

[0276] Application Scenario 13

[0277] When the user holds the handle of the hair dryer, the user's thumb can be just located on the side of the handle of the hair dryer facing the first air inlet. The user's thumb is raised, that is, it directly touches the master control switch, and the master control switch is turned on so that it is in the ON position. The hair dryer works in the default working mode. When the user needs the hair dryer to blow cold air, the four fingers of the user holding the hair dryer can directly touch the mode selection switch position on the side of the handle, press the cold air mode selection switch, and the hair dryer works in the cold air mode to improve comfort. When the user needs to dry the hair quickly, any of the four fingers of the user can press the high-power mode selection switch to make the hair dryer blow with the hottest air and the maximum wind force. During the entire operation process, in the holding state, each switch on the handle can be touched, and the user does not need to change the holding state to select the switch, thereby effectively improving the user experience.

[0278] When using an existing hair dryer, users are still troubled by its loud noise. The noise of the hair dryer is mainly generated by the fan assembly. When the fan assembly operates, due to the high-speed rotating mechanical motion and high-speed air flow, a relatively large noise is generated, which is concentrated in the medium and high frequency bands, reducing the comfort of use. The inventor believes that when the current hair dryer product is working, the noise generated by the fan inside the hair dryer can pass through the gap between the solid parts of the hair dryer and the air inlet grille without hindrance, and the grille holes on the air inlet grille transmit the noise to the outside, so that the noise can be transmitted out from the first air inlet of the hair dryer, making it audible to the user, thus reducing the comfort of use for the user.

[0279] In view of the above problems, the present application provides the following embodiments, which can reduce the overall noise of the hair dryer, especially the medium and high frequency noise, improve the product quality without affecting the use performance, and improve the user's comfort of use.

[0280] Figure 33 Schematic diagram of the disassembled structure of the hair dryer provided by an embodiment of the present application, Figure 34 Planar structure diagram of the front cover plate provided by an embodiment of the present application, Figure 35 Three-dimensional structure diagram of the front cover plate provided by an embodiment of the present application, as Figures 33 to 35 shown.

[0281] In an embodiment of the present application, a hair dryer is provided, which has an air flow channel (not shown in the figure) including a first air inlet 11 and a first air outlet 12. The first air inlet 11 has an air inlet surface, and air passes through the air inlet surface and enters the air flow channel, and flows out from the first air outlet 12. The hair dryer includes an exposed component 700 protruding from the air inlet surface. The exposed component 700 includes a front cover plate 710 facing the air inlet surface and a rear cover plate 720 facing away from the air inlet surface. The front cover plate 710 is provided with a first sound absorption hole 711 to guide the noise into a first sound absorption cavity formed by the front cover plate 710 and the rear cover plate 720.

[0282] In the technical solution provided by the embodiment of the present application, the front cover plate 710 is provided with a first sound absorption hole 711, and the front cover plate 710 and the rear cover plate 720 form a first sound absorption cavity. The first sound absorption hole 711 can guide the noise into the first sound absorption cavity, and the first sound absorption cavity can effectively absorb the noise transmitted out of the hair dryer, especially the medium and high frequency noise, to achieve the purpose of noise reduction, so as to reduce the overall noise of the hair dryer, improve the product quality without affecting the use performance, and improve the user's comfort of use.

[0283] For example, in the embodiment of the present application, the hair dryer includes a main body 10 with an air flow channel therein. The exposed component 700 is located on the air inlet side of the air flow channel and protrudes from the air inlet surface. The exposed component 700 at least partially blocks the first air inlet 11, so that part of the noise propagating from the inside of the main body 10 to the outside enters the first sound absorption cavity through the first sound absorption holes 711. The first sound absorption cavity can effectively absorb the noise propagating from the inside of the main body 10 to the rear of the hair dryer, especially medium and high-frequency noise, achieving the purpose of noise reduction, improving the product quality without affecting the use performance of the hair dryer, and improving the user's comfort during use.

[0284] In the embodiment of the present application, one realizable air inlet mode of the first air inlet 11 is that there is a gap for air flow between the front cover plate 710 and the air inlet surface, and the air flow enters the air flow channel through the gap. The air flow does not directly pass through the air inlet surface into the air flow channel, but first enters the gap between the front cover plate 710 and the air inlet surface, and then enters the air flow channel. The front cover plate 710 at least partially blocks the air inlet surface. Due to the blocking effect of the front cover plate 710, the air flow can uniformly enter the air flow channel from a peripheral edge of the front cover plate 710, and the air inlet path of the air flow has a certain bend, which helps to reduce noise. This air inlet mode of the first air inlet 11 can minimize the impact on the air flow rate while reducing noise. At the same time, the front cover plate 710 also avoids the problem of the air inlet surface being exposed outside, making the appearance of the hair dryer more beautiful.

[0285] See Figures 33 to 35 , in the embodiment of the present application, one realizable mode of the front cover plate 710 is that there are multiple first sound absorption holes 711, and the multiple first sound absorption holes 711 are evenly distributed around the central part of the front cover plate 710. The front cover plate 710 is connected to the rear cover plate 720 to form a first sound absorption cavity, and the first sound absorption cavity communicates with the outside through the first sound absorption holes 711. The noise can be guided into the first sound absorption cavity through the first sound absorption holes 711, and the structure of the first sound absorption holes 711 can initially achieve sound absorption. The size of the first sound absorption holes 711 is small, which has an inhibitory effect on medium and high-frequency sound waves. When the noise passes through the first sound absorption holes 711, especially when the medium and high-frequency noise passes through the first sound absorption holes 711, the first sound absorption holes 711 will exert a certain sound absorption resistance on the sound waves, and the sound energy of the medium and high-frequency noise is dissipated as heat through friction in the pores of the first sound absorption holes 711, weakening the sound waves passing through the first sound absorption holes 711. At the same time, due to the small size of the first sound absorption holes 711, the noise entering the first sound absorption cavity is not easy to propagate out through the first sound absorption holes 711 again, effectively suppressing the medium and high-frequency sound waves contained in the noise. In addition, the first sound absorption holes 711 can also effectively reduce the noise generated by Helmholtz resonance.

[0286] In the embodiment of the present application, the arrangement of the first sound absorption holes 711 is not only that a plurality of first sound absorption holes 711 are evenly distributed around the central part of the front cover plate 710. It can also be that the first sound absorption holes 711 are irregularly arranged around the central part of the front cover plate 710. When sound waves pass through the first sound absorption holes 711, each first sound absorption hole 711 can individually apply a sound absorption resistance, that is, each first sound absorption hole 711 can individually play a role in suppressing noise, and the combined action of a plurality of first sound absorption holes 711 is used to suppress noise. Further, the axis of the first sound absorption hole 711 is parallel to the axis of the main body 10, so that noise can be smoothly guided into the first sound absorption cavity through the first sound absorption hole 711.

[0287] Further, referring to Figure 36 , in an implementable embodiment of the present application, an air inlet grille 600 is provided at the first air inlet 11. A plurality of ventilation holes 64 are evenly distributed around the central part of the air inlet grille 600, and each ventilation hole 64 corresponds to at least one first sound absorption hole 711. The ventilation holes 64 of the air inlet grille 600 are used for air intake and isolating larger foreign objects. At the same time, the noise inside the hair dryer can also be transmitted to the outside through the ventilation holes 64. The first sound absorption hole 711 is arranged corresponding to the ventilation hole 67. On the one hand, it can ensure that after the noise exits from the ventilation hole 91, it can smoothly enter the first sound absorption cavity through the first sound absorption hole 711. On the other hand, the structure of the first sound absorption hole 711 is used to achieve the purpose of initially absorbing noise.

[0288] In the embodiment of the present application, the arrangement of the first sound absorption holes 711 can be arranged in cooperation with the shape of the ventilation holes 64. For example, continuing to refer to Figure 36 , an implementable way is that the ventilation hole 64 is an arc-shaped hole extending from the central part of the air inlet grille 600 along an arc to the edge of the air inlet grille 600. Each ventilation hole 64 corresponds to a plurality of first sound absorption holes 711, and the plurality of first sound absorption holes 711 corresponding to the same ventilation hole 64 are arranged in sequence along the arc of the ventilation hole 64. The ventilation hole 64 is an arc-shaped hole. On the one hand, it can ensure the smooth passage of air flow, and on the other hand, it can have a certain obstructive effect on noise, and the noise will not directly pass through the air inlet grille 600, and the propagation path of the sound wave has a certain bend, which helps to reduce noise. The plurality of first sound absorption holes 711 are arranged in sequence along the ventilation hole 64 to ensure that each first sound absorption hole 711 can correspond to the ventilation hole 64. The first sound absorption hole 711 is arranged corresponding to the ventilation hole 64. On the one hand, it can ensure that after the noise exits from the ventilation hole 64, it can smoothly enter the first sound absorption cavity through the first sound absorption hole 711. On the other hand, the structure of the first sound absorption hole 711 is used to achieve the purpose of initially absorbing noise.

[0289] To further enhance the noise reduction effect of the front cover plate 710, in the embodiment of the present application, on the surface of the front cover plate 710 facing the air inlet grid 600, a sound-absorbing groove 712 is provided corresponding to the position of each ventilation hole 64, and at least one first sound-absorbing hole 711 is provided in each sound-absorbing groove 712. The sound wave can be further attenuated by the sound-absorbing groove 712. When the sound wave propagates into the sound-absorbing groove 712, through the continuous reflection, diffraction, etc. of the inner wall of the sound-absorbing groove 712, a part of the sound energy is dissipated as heat energy due to friction during the reflection and diffraction processes, weakening the sound wave passing through the front cover plate 710. At the same time, the depth of the first sound-absorbing hole 711 can be changed through the sound-absorbing groove 712, thereby changing the noise reduction frequency.

[0290] In the embodiment of the present application, the noise to be reduced is the noise generated by the blower assembly 60 of the hair dryer. In order to perform targeted noise reduction on the noise generated by the blower assembly 60, one feasible way is to determine the main noise reduction frequency band by setting parameters such as the corresponding aperture, depth of the first sound-absorbing hole 711, and the opening rate of the front cover plate 710. When setting parameters such as the aperture, depth, and opening rate of the front cover plate 710, it can be set according to the measured results of the noise generated by the blower assembly 60 during the actual use of the hair dryer. Or, the same type of blower assembly 60 can adopt the same set parameters. In the embodiment of the present application, the range of the hole diameter of the first sound-absorbing hole 711 is 1.0 - 1.5 mm; the range of the depth of the first sound-absorbing hole 711 is 1.0 - 2.0 mm; the range of the opening rate of the first sound-absorbing hole 711 on the front cover plate 710 is 5% - 15%.

[0291] It should be noted that the above parameters such as the aperture, depth, and opening rate of the front cover plate 710 are only illustrative. Those skilled in the art can set them according to different noise reduction requirements. The embodiment of the present application does not make specific limitations, and at the same time, this does not constitute an improper limitation of the embodiment of the present application.

[0292] Continue to refer to Figure 33, To further improve the sound insulation effect of the exposed component 700, in an achievable embodiment of the present application, sound-absorbing cotton 730 is further provided in the first sound insulation cavity, and the sound-absorbing cotton 730 covers a plurality of first sound insulation holes 711. The sound-absorbing cotton 730 has a multi-microporous structure. Through the microporous structure, sound energy is converted into heat energy and dissipated by friction in the pores of the sound-absorbing cotton, weakening the sound waves passing through the front cover plate 710. The sound-absorbing cotton 730 is located between the front cover plate 710 and the rear cover plate 720. When the front cover plate 710 and the rear cover plate 720 are connected, a clamping structure is formed, and the sound-absorbing cotton 730 is fixed through the clamping structure. After the sound-absorbing cotton 730 is fixed, it can cover a plurality of first sound insulation holes 711. The sound-absorbing cotton 730 can absorb the sound wave energy in the noise, avoid the resonance of the sound waves in the noise. At the same time, the sound-absorbing cotton 730 can also convert the sound energy into heat energy to achieve the purpose of sound insulation. The sound-absorbing cotton 730 and the first sound insulation holes 711 work together to reduce the overall noise of the hair dryer.

[0293] Further, referring to Figure 34 , Figure 35 and Figure 37 , in the embodiment of the present application, a connection method of an exposed component 700 is that the central part of the front cover plate 710 has a connection hole 713 and a positioning groove 714. On the side of the rear cover plate 720 facing the front cover plate 710, a connection post 721 and a positioning post 722 are provided. The connection post 721 is connected to the air inlet grille 600 through the connection hole 713, and the positioning post 722 is connected to the positioning groove 714. The connection post 721 and the air inlet grille 600 can be connected in a variety of connection methods, such as screw connection, snap connection or magnetic connection, etc. When the connection post 721 is connected to the air inlet grille 60, a screw, a snap connector or a magnetic connector passes through the connection hole 713 on the front cover plate 710 to complete the connection between the connection post 721 and the air inlet grille 600. The positioning post 722 and the positioning groove 714 can be connected in a variety of connection methods, such as screw connection, snap connection or magnetic connection, etc.

[0294] Further, referring to Figure 37 and Figure 38, in a feasible embodiment of the present application for better noise reduction, a plurality of second sound absorption holes 66 are provided at the central part of the air inlet grid 600, and the plurality of second sound absorption holes 66 and the front cover plate 710 form a second sound absorption cavity. A plurality of ventilation holes 64 are distributed around the plurality of second sound absorption holes 66. The plurality of second sound absorption holes 66 can be distributed at the central part of the air inlet grid 600 according to a predetermined arrangement manner. The second sound absorption holes 66 can be used for air inlet and sound absorption. Without affecting the air inlet of the air inlet grid 600, the noise can be guided into the second sound absorption cavity through the second sound absorption holes 66, and the sound absorption can be initially realized through the structure of the second sound absorption holes 66. The size of the second sound absorption holes 66 is small, which has an inhibitory effect on the medium and high frequency sound waves contained in the noise. When the noise passes through the second sound absorption holes 66, especially when the medium and high frequency noise passes through the second sound absorption holes 66, the second sound absorption holes 66 will exert a certain sound absorption resistance on the sound waves. The sound energy of the medium and high frequency noise is dissipated as heat through friction in the pores of the second sound absorption holes 66, weakening the sound waves passing through the second sound absorption holes 66. At the same time, due to the small size of the second sound absorption holes 66, the noise entering the second sound absorption cavity is not easily transmitted out through the second sound absorption holes 66 again, effectively suppressing the medium and high frequency sound waves contained in the noise. For the noise transmitted from the hair dryer, part of the noise is reduced in noise through the second sound absorption holes 66 and the second sound absorption cavity, and part of the noise is reduced in noise through the first sound absorption holes 711 and the first sound absorption cavity. The double sound absorption makes most of the noise transmitted from the hair dryer be absorbed and consumed, thereby reducing the overall noise of the hair dryer.

[0295] In the embodiment of the present application, the arrangement manner of the second sound absorption holes 66 is not only that the plurality of second sound absorption holes 66 can be distributed at the central part of the air inlet grid 600 according to a predetermined arrangement manner. It can also be that the second sound absorption holes 66 are irregularly arranged at the central part of the air inlet grid 600. When the sound waves pass through the second sound absorption holes 66, each second sound absorption hole 66 can individually exert a sound absorption resistance, that is, each second sound absorption hole 66 can individually play a role in suppressing noise, and the combined action of the plurality of second sound absorption holes 66 is used to suppress noise.

[0296] In the embodiments of the present application, the noise to be reduced is the noise generated by the blower assembly 60 of the hair dryer. In order to perform targeted noise reduction on the noise generated by the blower assembly 60, a feasible method is to determine the main noise reduction frequency band by setting parameters such as the corresponding aperture diameter, hole depth of the second sound absorption hole 66, and the opening ratio of the air inlet grid 600. Here, the opening ratio refers to the opening ratio of the second sound absorption hole 66. When setting parameters such as the aperture diameter, hole depth, and the opening ratio of the air inlet grid 600, it can be set according to the measured results of the noise generated by the blower assembly 60 during the actual use of the hair dryer. Alternatively, the same type of blower assembly 60 can adopt the same set parameters. In the embodiments of the present application, the range of the hole diameter of the second sound absorption hole 66 is 1.0 - 1.5 mm; the range of the hole depth of the second sound absorption hole 66 is 1.0 - 2.0 mm; the range of the opening ratio of the second sound absorption hole 66 on the air inlet grid 600 is 5% - 15%.

[0297] It should be noted that the above parameters such as the aperture diameter, hole depth, and the opening ratio of the air inlet grid 600 are only illustrative. Those skilled in the art can set them according to different noise reduction requirements. The embodiments of the present application do not make specific limitations, and at the same time, this does not constitute an improper limitation of the embodiments of the present application.

[0298] Next, in combination with specific application scenarios, the technical solutions adopted in the present application will be described to help understanding. In the following application scenarios, a hand-held hair dryer is taken as an example.

[0299] Application Scenario 14

[0300] When the hair dryer is working, the external air flow enters the air flow channel through the gap between the front cover plate and the air inlet surface. The air flow does not directly pass through the air inlet surface and enter the air flow channel, but enters the air flow channel from a peripheral edge of the front cover plate. The air inlet path of the air flow has a certain bend, which helps to reduce noise.

[0301] At the same time, part of the noise propagated backward by the hair dryer is guided through the first sound absorption hole into the first sound absorption cavity formed by the front cover plate and the rear cover plate. The first sound absorption hole can initially reduce the noise, and the first sound absorption cavity can effectively absorb the noise propagated from inside the hair dryer, especially medium and high-frequency noise, so as to reduce the overall noise of the hair dryer, achieve the purpose of noise reduction, improve the product quality without affecting the use performance, and improve the user's use comfort. After setting the first sound absorption hole and the first sound absorption cavity, the overall sound power of the hair dryer is reduced by more than 0.4 dB, and the rear sound pressure level is reduced by more than 1.5 dB.

[0302] Application Scenario 15

[0303] When the hair dryer is working, the external air flow enters the air flow channel through the gap between the front cover plate and the air inlet surface. The air flow does not directly penetrate through the air inlet surface into the air flow channel, but enters the air flow channel from a peripheral edge of the front cover plate. The air inlet path of the air flow has a certain bend, which helps to reduce noise.

[0304] At the same time, part of the noise propagated backward by the hair dryer is guided through the first sound absorption holes into the first sound absorption cavity formed by the front cover plate and the rear cover plate. Sound absorption cotton is arranged in the sound absorption cavity. The first sound absorption holes can initially reduce the noise, and the first sound absorption cavity further absorbs the noise through the sound absorption cotton. The sound absorption cotton has a multi-microporous structure. Through the microporous structure, the sound energy is converted into heat energy and dissipated by friction in the pores of the sound absorption cotton, weakening the sound wave passing through the front cover plate, so as to achieve the purpose of noise reduction. The first sound absorption cavity can effectively absorb the noise propagated out of the hair dryer, especially medium and high frequency noise, so as to reduce the overall noise of the hair dryer, improve the product quality without affecting the use performance, and improve the user's comfort.

[0305] Application scenario 16

[0306] When the hair dryer is working, the external air flow enters the air flow channel through the gap between the front cover plate and the air inlet surface. The air flow does not directly penetrate through the air inlet surface into the air flow channel, but enters the air flow channel from a peripheral edge of the front cover plate. The air inlet path of the air flow has a certain bend, which helps to reduce noise.

[0307] At the same time, part of the noise propagated backward by the hair dryer is reduced in noise through the second sound absorption holes and the second sound absorption cavity. The size of the second sound absorption holes is small, which has an inhibitory effect on the medium and high frequency sound waves contained in the noise. When the noise passes through the second sound absorption holes, especially when the medium and high frequency noise passes through the second sound absorption holes, the second sound absorption holes will exert a certain sound absorption resistance on the sound wave. The sound energy of the medium and high frequency noise is converted into heat energy and dissipated by friction in the pores of the second sound absorption holes, weakening the sound wave passing through the second sound absorption holes.

[0308] There is also part of the noise guided through the first sound absorption holes into the first sound absorption cavity formed by the front cover plate and the rear cover plate. Sound absorption cotton is arranged in the sound absorption cavity. The first sound absorption holes can initially reduce the noise. The size of the first sound absorption holes is small, which has an inhibitory effect on the medium and high frequency sound waves. When the noise passes through the first sound absorption holes, especially when the medium and high frequency noise passes through the first sound absorption holes, the first sound absorption holes will exert a certain sound absorption resistance on the sound wave. The sound energy of the medium and high frequency noise is converted into heat energy and dissipated by friction in the pores of the first sound absorption holes, weakening the sound wave passing through the first sound absorption holes. The first sound absorption cavity further reduces the noise through the sound absorption cotton.

[0309] The combination of the second sound absorption holes and the second sound absorption cavity and the first sound absorption holes and the first sound absorption cavity forms a double sound absorption, so that most of the noise propagated out of the hair dryer is absorbed and consumed, thereby reducing the overall noise of the hair dryer.

[0310] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A hair dryer, characterized in that, it includes: a main body having a first air inlet and a first air outlet, and a main control board, a heating component and a fan component electrically connected to the main control board are arranged inside the main body; a distance sensor arranged at the end of the first air outlet and electrically connected to the main control board, so that the main control board receives the distance signal detected by the distance sensor and controls the working states of the heating component and the fan component; and a nozzle rotatably arranged at the end of the first air outlet of the main body; there are at least two of the distance sensors; each of the distance sensors is independently electrically connected to the main control board; the connection line between every two of the distance sensors does not pass through the center point of the first air outlet, so that when the nozzle is rotatably installed, the two distance sensors cannot be blocked simultaneously.

2. The hair dryer according to claim 1, characterized in that, the distance sensor is connected to the main control board through a distance recognition circuit.

3. The hair dryer according to claim 1, characterized in that, the distance sensor includes a transmitting area and a receiving area; the connection line between the transmitting area on each distance sensor and the transmitting area and the receiving area on another distance sensor does not pass through the center point of the first air outlet; the connection line between the receiving areas on each distance sensor and the receiving areas on another distance sensor does not pass through the center point of the first air outlet.

4. The hair dryer according to claim 1, characterized in that, a correction circuit is arranged on the main control board, and the correction circuit is electrically connected to the distance sensor.

5. The hair dryer according to claim 1, characterized in that, a heat insulation layer is arranged on the outer periphery of the distance sensor.

6. The hair dryer according to claim 5, characterized in that, an installation groove is arranged at the end of the first air outlet; the distance sensor is installed in the installation groove; the heat insulation layer is arranged between the installation groove and the distance sensor.

7. The hair dryer according to claim 1, characterized in that, a handle is further arranged on the main body; a control unit is arranged on the handle, and the control unit is electrically connected to the main control board.

8. The hair dryer according to claim 7, characterized in that, a temperature sensor is arranged inside the main body, and the temperature sensor is electrically connected to the main control board, so that the main control board receives the temperature signal detected by the temperature sensor and controls the working states of the heating component and the fan component.

9. The hair dryer according to claim 1, characterized in that, the distance sensor is one or more of an infrared ranging sensor, a radar ranging sensor or a laser ranging sensor.

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