Hair drying tools

Abstract

The present application relates to a kind of hair drying appliances, comprising: handle, motor is arranged in the handle;Shell, the shell is connected with the handle;Line board assembly, the line board assembly is set in the shell, multiple elements are provided on the line board assembly, line board frame, the line board frame is set in the shell, the line board assembly and the line board frame are arranged along the axial direction of the shell, recessed portion is provided on the line board frame, at least part of the element extends into the recessed portion.The structure of the hair drying appliance is more compact, smaller, more convenient for daily storage, and convenient for carrying out.

Description

Technical Field

[0001] This invention relates to the field of hair drying technology, and in particular to hair drying tools. Background Technology

[0002] Normally, after washing your hair, letting the moisture evaporate naturally takes a long time. Hair dryers can speed up the drying process, shorten the waiting time, and also allow for styling, bringing great convenience to our daily lives. However, some hair dryers are quite large, making them inconvenient to store and carry when traveling. Summary of the Invention

[0003] Based on this, the present invention proposes a hair drying tool with a more compact structure, smaller size, easier daily storage, and easier to carry when going out.

[0004] Hair drying tools, including:

[0005] A handle, wherein a motor is installed inside the handle;

[0006] A housing, which is connected to the handle;

[0007] A circuit board assembly, disposed within the housing, wherein the circuit board assembly has multiple components.

[0008] A circuit board frame is disposed within the housing, and the circuit board assembly and the circuit board frame are arranged along the axial direction of the housing. The circuit board frame has a recessed portion that is recessed in a direction away from the circuit board assembly, and at least a portion of the components extend into the recessed portion.

[0009] In one embodiment, the vertical distance the element extends along the axial direction is defined as the height of the element, and the height of at least a portion of the element whose projection along the axial direction lies within the recess is greater than the height of the element whose projection lies outside the recess.

[0010] In one embodiment, the circuit board frame includes a first plate and a second plate, wherein the distance between the second plate and the circuit board assembly along the axial direction is greater than the distance between the first plate and the circuit board assembly, and at least a portion of the components are projected onto the second plate along the axial direction.

[0011] In one embodiment, the first plate and the second plate have a smooth transition, the hair drying appliance includes an air duct, the circuit board frame separates the circuit board assembly from the air duct, airflow flows radially into the side of the circuit board frame away from the circuit board assembly along the housing, and flows axially out along the housing.

[0012] In one embodiment, the circuit board assembly includes a first circuit board and a second circuit board spaced apart along the axial direction, the second circuit board being located between the first circuit board and the circuit board frame, and of the plurality of elements, some are disposed on the first circuit board and some are disposed on the second circuit board, the projection of the second circuit board along the axial direction at least partially coinciding with the projection of the first circuit board along the axial direction.

[0013] In one embodiment, the vertical distance the element extends along the axial direction is defined as the height of the element. Along the axial direction, the area outside the projection area on the first circuit board projected by the second circuit board is defined as a first region. Among the elements disposed on the first circuit board, at least a portion of the elements in the first region have a height greater than the height of the elements in the projection region.

[0014] In one embodiment, the element, with a height not less than the distance between the first circuit board and the second circuit board, is disposed on the first circuit board and located within the first region.

[0015] In one embodiment, the vertical distance the element extends along the axial direction is defined as the height of the element. Along the axial direction, the area outside the projection area on the first circuit board projected by the second circuit board is defined as a first region. The height of at least a portion of the elements disposed on the first circuit board within the first region is greater than the height of the elements disposed on the second circuit board.

[0016] In one embodiment, at least a portion of the element disposed on the first circuit board, located within the first region, extends into the recess.

[0017] In one embodiment, the circuit board frame includes a first plate and a second plate. Along the axial direction, the distance between the second plate and the circuit board assembly is greater than the distance between the first plate and the circuit board assembly. At least some of the components disposed on the second circuit board are attached to the first plate, and at least some of the components disposed on the first circuit board are attached to the second plate.

[0018] In one embodiment, the first circuit board is provided with at least a capacitor and a negative ion generator, and the capacitor and the negative ion generator are located in the first area.

[0019] In one embodiment, the second circuit board has at least one transistor.

[0020] In one embodiment, the hair drying appliance includes an air duct, and a heat sink is embedded on the circuit board frame that communicates with the air duct, the heat sink being in contact with the transistor.

[0021] In one embodiment, the circuit board assembly is fixedly connected to the circuit board frame.

[0022] In one embodiment, the circuit board frame includes a fixing post extending toward the circuit board assembly, the fixing post being fixedly connected to the first circuit board, and the projection of the fixing post along the axial direction being located within the range of the first circuit board.

[0023] In one embodiment, the circuit board frame includes a plurality of positioning members extending toward the circuit board assembly, each of the positioning members being connected to the outside of one of the fixing posts, and the sidewall of the first circuit board abutting against the plurality of positioning members.

[0024] In one embodiment, a heating element is also included. The circuit board assembly, the circuit board frame, and the heating element are arranged sequentially along the axial direction. The circuit board frame is fixedly connected to the heating element, and the heating element is fixedly connected to the housing.

[0025] In one embodiment, the heating component includes an outer cylinder and an inner cylinder. The outer cylinder is fixedly connected to the circuit board frame. The outer cylinder is sleeved outside the inner cylinder. A heating wire is disposed between the inner cylinder and the outer cylinder. A water ion generator is disposed inside the inner cylinder.

[0026] In one embodiment, the heating component further includes a temperature control device and a wire. The temperature control device includes a thermostat and a fuse that are electrically connected to each other. The circuit board assembly, the heating wire, and the temperature control device are electrically connected in sequence to form a circuit. The circuit board assembly and the heating wire are used as external components. The fuse is electrically connected to the external components through the wire, which is disposed inside the inner cylinder.

[0027] In one embodiment, the outer wall of the inner cylinder is provided with an inwardly recessed receiving groove, and the temperature controller is disposed in the receiving groove.

[0028] In one embodiment, the area on the inner sidewall of the inner cylinder corresponding to the receiving groove extends inward to form an extension.

[0029] In one embodiment, a magnetic component is also included. The outer cylinder includes an outer cylinder side plate and an outer cylinder end plate. The outer cylinder side plate is radially disposed on the outside of the inner cylinder. The outer cylinder end plate is located at the outer end of the protrusion. The magnetic component is engaged between the protrusion and the outer cylinder end plate.

[0030] In one embodiment, a nutrient box is also included, which, along with the magnetic component, is engaged between the protrusion and the outer cylinder end plate.

[0031] In one embodiment, both the nutrient box and the magnetic component are annular, and the ratio m of the central angle of the area occupied by the magnetic component to the central angle of the area occupied by the nutrient box is in the range of 1.5 ≤ m ≤ 2.

[0032] In one embodiment, the circuit board frame includes a conduit extending toward the heating component, through which the conductor passes.

[0033] In one embodiment, the circuit board frame has an opening on the side near the heating component, the interior of the circuit board frame is hollow to form a cavity, the protective tube extends into the cavity, and the end of the protective tube abuts against the inner cylinder.

[0034] In one embodiment, the maximum diameter d of the first circuit board is in the range of 60mm≤d≤65mm, the distance s between the first circuit board and the second circuit board is in the range of s≥8mm, and the height h of the capacitor is in the range of 22mm≤h≤24mm.

[0035] The aforementioned hair drying device has a recessed portion on the circuit board frame that is recessed away from the circuit board assembly. The recessed portion can avoid at least some of the components on the circuit board assembly, allowing them to extend into the recessed portion. In this way, the space in the axial direction can be fully utilized, making the circuit board assembly and circuit board frame more compactly distributed in the axial direction. The overall size of the circuit board assembly and circuit board frame is also smaller, which makes the hair drying device smaller, easier to store in daily life, and easier to carry when going out. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of a hair drying tool according to an embodiment of the present invention;

[0037] Figure 2 for Figure 1 Cross-sectional view of a hair drying tool;

[0038] Figure 3 for Figure 1 A schematic diagram of the circuit board, circuit board frame and heating element of a hair drying device;

[0039] Figure 4 for Figure 1 A cross-sectional view of components such as the circuit board, circuit board frame, and heating element of a hair drying device;

[0040] Figure 5 for Figure 1 A schematic diagram of the circuit board structure for a medium-sized hair drying device;

[0041] Figure 6 for Figure 1A schematic diagram of the circuit board frame for a medium-sized hair drying device;

[0042] Figure 7 for Figure 6 A cross-sectional view of the circuit board frame of a hair drying device;

[0043] Figure 8 for Figure 1 A schematic diagram of the heating element of a medium-sized hair drying device;

[0044] Figure 9 for Figure 8 A schematic diagram of the structure of components such as the inner cylinder of the heating element;

[0045] Figure 10 for Figure 8 Schematic diagram of the outer cylinder of the heating element;

[0046] Figure 11 for Figure 8 A partial structural diagram of the heating element;

[0047] Figure 12 for Figure 11 Schematic diagram of a greywater ion generator;

[0048] Figure 13 This is a schematic diagram of the structure of the magnetic component and the nutrient box in one embodiment of the present invention;

[0049] Figure 14 This is the electrical connection method of the heating wire, temperature control device and circuit board assembly in one embodiment of the present invention;

[0050] Figure 15 This is the electrical connection method of the heating wire, temperature control device and circuit board assembly in another embodiment of the present invention.

[0051] Figure label:

[0052] Hair drying tool body 10, outer shell 100, hook 110, end cap 120;

[0053] Circuit board assembly 200, first circuit board 210, wire slot 211, second circuit board 220, first notch 221, support member 230, capacitor 241, negative ion generator 242, transistor 243, thyristor 244;

[0054] Circuit board frame 300, first flat plate 311, second flat plate 312, second recess 313, fixing post 320, positioning component 330, cable protection tube 341, second cable protection tube 343, locking block 351, opening 361, cavity 362;

[0055] Heating element 400, outer cylinder 410, first slot 411, first limiting slot 412, first protrusion 413, second protrusion 414, second slot 415, outer ring air outlet 416, center air outlet 417, third slot 418, inner cylinder 420, mounting slot 421, receiving slot 422, protrusion 423, limiting plate 424, second fixing post 425.

[0056] Heating wire 430, first heating layer 431, second heating layer 432, outer fixing plate 441, serration 4411, second notch 4412, inner fixing plate 442, heat insulation cylinder 443, thermostat 451, fuse 452, thermistor 453, wire 460, heat insulation sheet 470;

[0057] Water ion generator 500, emitting needle 510, emitting needle holder 520, third notch 521, wire guide groove 522, second limiting groove 523;

[0058] Touch screen assembly 610, heat sink 620, magnetic component 630, sealing ring 640, nutrient container 650;

[0059] Handle 700, air inlet 710, motor 720. Detailed Implementation

[0060] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0066] See Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of a hair drying tool according to one embodiment of the present invention. Figure 2 for Figure 1A cross-sectional view of a hair drying tool. An embodiment of the present invention provides a hair drying tool including a main body 10 and a handle 700. The handle 700 is connected to the main body 10, and their inner cavities are interconnected to form an air duct. An air inlet mesh 710 is provided on the handle 700, and an air outlet is provided on the main body 10. A motor 720 is installed inside the handle 700. The rotation of the motor 720 causes airflow to flow through the air inlet mesh 710 into the air duct, gradually moving towards the main body 10, and finally exiting from the air outlet, thereby achieving hair drying or styling.

[0067] See Figure 2 , Figure 3 , Figure 6 and Figure 7 , Figure 3 for Figure 1 A schematic diagram of the circuit board, circuit board frame, and heating element of a hair drying device. Figure 4 for Figure 1 A cross-sectional view of components such as the circuit board, circuit board frame, and heating element of a hair drying device. Figure 6 for Figure 1 A schematic diagram of the circuit board frame for a hair drying device. Figure 7 for Figure 6 A cross-sectional view of the circuit board frame of a hair drying appliance. The main body 10 of the hair drying appliance includes components such as a housing 100, a circuit board assembly 200, and a circuit board frame 300. The housing 100 is fixedly connected to the handle 700. The circuit board assembly 200 and the circuit board frame 300 are arranged along the axial direction of the housing 100 inside the housing 100. The housing 100 isolates these internal components from the outside, thereby forming protection. The housing 100 is preferably made of a high-strength material. The circuit board assembly 200 is provided with multiple components, and the circuit board frame 300 is provided with a recessed portion that is recessed away from the circuit board assembly 200. The recessed portion can accommodate at least some components, allowing them to extend into the recessed portion. Thus, along the axial direction of the outer casing 100, the circuit board assembly 200 and the circuit board frame 300 are in a concave-convex fit, which allows for more efficient use of space along the axial direction of the outer casing 100. The circuit board assembly 200 and the circuit board frame 300 are more compactly distributed along the axial direction of the outer casing 100, resulting in a smaller size of the hair drying appliance along the axial direction of the outer casing 100, making it easier to store and carry when traveling. For ease of explanation and understanding, the positional relationship of each component will be described below with reference to the orientation of the accompanying drawings, but this orientation is not intended to limit the positional relationship of the components. In addition, the vertical distance that the component on the circuit board assembly 200 extends along the axial direction of the outer casing 100 is defined as the height of the component, and "along the axial direction" as used below refers to the axial direction of the outer casing 100.

[0068] In some embodiments, the recess is located on the side of the circuit board frame 300 away from the handle 700, that is, in Figure 2From the view shown, the recess is located at the left end of the circuit board frame 300.

[0069] In some embodiments, all components extending from the circuit board assembly 200 extend into the recess. For example, a large recess may be provided such that the axial projection of all components lies within the recess. Alternatively, multiple recesses may be provided to accommodate components in different areas.

[0070] In other embodiments, some components extending downwards from the circuit board assembly 200 extend into the recess, while others are located outside the recess. That is, the axial projection of some components lies within the recess, and the axial projection of others lies outside. Preferably, the height of at least some components whose axial projection lies within the recess is greater than the height of those whose projection lies outside. Specifically, in some embodiments, the height of all components whose axial projection lies within the recess is greater than the height of those whose projection lies outside. Alternatively, in other embodiments, the height of some components whose axial projection lies within the recess is greater than the height of those whose projection lies outside, while the height of some components is less than or equal to the height of those whose projection lies outside. By maximizing the number of taller components extending into the recess, the overall axial dimension can be significantly reduced. Smaller components have little impact on the overall axial dimension and can be located either within or outside the recess.

[0071] In some embodiments, if the recess depth is large, the component can be fully inserted. When fully inserted, there may be a gap or contact between the component and the bottom wall of the recess. If the recess depth is small, the component may only be partially inserted, with part remaining outside the recess, but even so, the axial dimension can be reduced.

[0072] See Figure 6 and Figure 7 In some embodiments, the circuit board frame 300 includes a first plate 311 and a second plate 312. Along the axial direction, the distance between the second plate 312 and the circuit board assembly 200 is greater than the distance between the first plate 311 and the circuit board assembly 200. That is, the aforementioned recess is formed at the second plate 312, and at least some components have their axial projections located in the region where the second plate 312 is located. In other embodiments, the recess can also be formed by a curved surface, for example, by a recessed spherical surface. Alternatively, the recess can be formed by providing a polygonal groove, such as a rectangular groove. Besides the shapes listed above, other conventional recess shapes are also possible.

[0073] As previously described, airflow enters the air duct through the air inlet mesh 710 on the handle 700 and flows into the hair drying appliance body 10. The circuit board frame 300 separates the circuit board assembly 200 from the air duct on both sides of the circuit board frame 300. Preferably, the airflow flows radially into the side of the circuit board frame 300 away from the circuit board assembly 200, changes direction, and flows out axially along the housing 100, where the air duct bends. Preferably, the first plate 311 and the second plate 312 have a smooth transition via a curved surface. This transition area guides the airflow direction, allowing the airflow path to smoothly transition from radial flow along the housing 100 to axial flow along the housing 100. Compared to a sudden vertical change in flow direction, this reduces pressure and velocity losses. Furthermore, the presence of the recess reduces the space on the side of the circuit board frame 300 away from the circuit board assembly 200, thus increasing the airflow pressure and velocity and compensating for the pressure and velocity losses caused by the change in flow direction. The second flat plate 312 and the side wall of the circuit board frame 300 can also be smoothly transitioned by a curved surface.

[0074] See Figures 4 to 7 , Figure 5 for Figure 1A schematic diagram of the circuit board structure of a hair drying device. In some embodiments, the circuit board assembly 200 includes a first circuit board 210 and a second circuit board 220, which are spaced apart along the axial direction. Specifically, a support member 230 is provided between the first circuit board 210 and the second circuit board 220, and both the second circuit board 220 and the first circuit board 210 are fixedly connected to the support member 230. For example, the second circuit board 220 and the first circuit board 210 are respectively fixed to both ends of the support member 230. At the same time, the second circuit board 220 and the first circuit board 210 are electrically connected through the support member 230. The second circuit board 220 is located between the first circuit board 210 and the circuit board frame 300. Among the multiple components, some are disposed on the first circuit board 210 and some are disposed on the second circuit board 220. The projection of the second circuit board 220 along the axial direction of the housing 100 at least partially coincides with the projection of the first circuit board 210 along the axial direction of the housing 100. If the number and size of the components remain unchanged, compared to using one circuit board, using two circuit boards, with their projections along the axial direction of the housing 100 at least partially overlapping, can reduce the radial dimension of the circuit board assembly 200, thereby reducing the radial dimension of the entire hair drying appliance body 10. Although two spaced-apart circuit boards increase the axial dimension compared to one circuit board, this disadvantage can be mitigated or even eliminated by combining it with the aforementioned method of providing recesses on the circuit board frame 300 for avoidance, thus minimizing both the radial and axial dimensions of the hair drying appliance body 10. Specifically, the projections of the first circuit board 210 and the second circuit board 220 along the axial direction of the housing 100 can partially overlap. Alternatively, preferably, the projection of the second circuit board 220 along the axial direction of the housing 100 is entirely within the range of the first circuit board 210, for example... Figure 5 In the embodiment shown, the maximum radial dimension of the circuit board assembly 200 is the same as the dimension of the first circuit board 210, thus minimizing the radial dimension.

[0075] In some embodiments, the area outside the projection area on the first circuit board 210 projected axially from the second circuit board 220 is defined as the first region. Some components on the first circuit board 210 are located within the projection region, and some are located outside the projection region (i.e., within the first region). The height of the components within the projection region should be less than the distance between the first circuit board 210 and the second circuit board 220, and the distance between them should ensure a minimum safe distance to avoid safety hazards due to excessively small distances between the components and the second circuit board 220. Preferably, at least some components located within the first region have a greater height than those located within the projection region. For example, some components within the first region have a greater height than those located within the projection region, and some components have a height less than or equal to that of those located within the projection region. Alternatively, all components within the first region have a greater height than those located within the projection region. Since the distance between the first circuit board 210 and the second circuit board 220 should be no less than the height of the components located within the projection area, by placing as many of the taller components as possible in the first area outside the projection area and as many of the shorter components as possible within the projection area, the distance between the first circuit board 210 and the second circuit board 220 does not need to be set too large. In this way, the overall axial dimension of the circuit board assembly 200 can be reduced to a significant extent.

[0076] Preferably, components with a height greater than or equal to the distance between the first circuit board 210 and the second circuit board 220 are disposed on the first circuit board 210 and located within the first region. Figure 5 In the illustrated embodiment, the first circuit board 210 is a circular board, and the second circuit board 220 is an irregularly shaped board with a notch. The notch can provide clearance for components whose height is greater than or equal to the distance between the first circuit board 210 and the second circuit board 220. Of course, the second circuit board 220 can also be a regular shape, such as a circle, ellipse, or polygon. Similarly, the first circuit board 210 can also be a regular shape such as an ellipse or polygon. Furthermore, the position of the notch on the second circuit board 220 is not limited, as long as it can clear components disposed on the first circuit board 210.

[0077] In some embodiments, among the components disposed on the first circuit board 210, at least some components located in the first region have a height greater than the height of components disposed on the second circuit board 220. For example, some components located in the first region have a height greater than the height of components on the second circuit board 220, while some components have a height less than or equal to the height of components on the second circuit board 220. Alternatively, all components located in the first region have a height greater than the height of components on the second circuit board 220. That is, at least some of the taller components are disposed in the first region. Compared to disposing of these components on the second circuit board 220, this solution can fully utilize the distance between the first circuit board 210 and the second circuit board 220. Among the taller components, the portion located between the first circuit board 210 and the second circuit board 220 does not increase the axial dimension of the entire circuit board assembly 200, thereby reducing the axial dimension of the entire circuit board assembly 200. For the portion of the components on the first circuit board 210 whose height is greater than the sum of the distance between the first circuit board 210 and the second circuit board 220 and the height of the components on the second circuit board 220, the distance they extend beyond the second circuit board 220 can be reduced. Compared to placing these components within the projection area, there is no need to increase the spacing between the first circuit board 210 and the second circuit board 220 due to the placement of these relatively tall components between them, thereby reducing the overall axial dimension of the circuit board assembly 200. In summary, the above arrangement method is beneficial for significantly reducing the overall axial dimension of the circuit board assembly 200.

[0078] Furthermore, in some embodiments, at least a portion of the components disposed on the first circuit board 210, located within the first region, extend into a recess provided on the circuit board frame 300. As mentioned above, components with greater height are preferably located within the first region, so that these components extending into the recess provided on the circuit board frame 300 can avoid the recess, thereby significantly reducing the overall axial dimension of the circuit board assembly 200.

[0079] See Figure 4In some embodiments, when the circuit board frame 300 is configured with the first plate 311 and the second plate 312 as described in the aforementioned embodiments, at least some components on the second circuit board 220 are attached to the first plate 311, and at least some components on the first circuit board 210 are attached to the second plate 312. Specifically, some components on the second circuit board 220 are attached to the first plate 311, or all components are attached to the first plate 311. Some components on the first circuit board 210 are attached to the second plate 312, or all components are attached to the second plate 312. Thus, after the circuit board assembly 200 and the circuit board frame 300 are installed, the second circuit board 220 and the components attached to it are mutually restrained in the axial direction, and the first circuit board 210 and the components attached to it are also mutually restrained, which makes the fixing relationship more stable.

[0080] See Figure 5 and Figure 6 Specifically, in some embodiments, the first circuit board 210 is provided with components such as a capacitor 241, a negative ion generator 242, and a silicon controlled rectifier (SCR) 244, all of which are located within a first region. Typically, the capacitor 241, negative ion generator 242, and SCR 244 are relatively tall; placing them within the first region allows for full utilization of the distance between the first circuit board 210 and the second circuit board 220, thereby reducing the axial dimension of the entire circuit board assembly 200. Specifically, the capacitor 241 and negative ion generator 242 correspond to the second flat plate 312, which avoids the capacitor 241 and negative ion generator 242. The SCR 244 corresponds to the second recess 313 on the circuit board frame 300, which avoids the SCR 244. The arrangement of the second recess 313 is similar to that of the aforementioned recess and will not be repeated here. In addition, the first circuit board 210 is also equipped with components such as heating element connection terminals, negative ion generator connection terminals, water ion generator connection terminals, and thermistor connection terminals, which can be located within the projection area or within the first area. It should be noted that the specific arrangement of each component is not limited. Figure 5 In the middle, capacitor 241 and negative ion generator 242 are arranged adjacent to each other, but Figure 5 The arrangement of the components is shown only in one embodiment; the components may also be arranged in other locations. In some embodiments, the capacitor 241 is plugged into the first circuit board 210 via a pin, and the negative ion generator 242 is connected to the first circuit board 210 via a wire.

[0081] In some embodiments, the second circuit board 220 has a transistor 243 with a small height, so that its placement on the second circuit board 220 has little impact on the overall axial dimension of the circuit board assembly 200. Furthermore, the second circuit board 220 also has components such as a drive mechanism. In a specific embodiment, the first circuit board 210 is approximately circular, with a maximum diameter d ranging from 60mm to 65mm, the height h of the capacitor 241 ranging from 22mm to 24mm, and the distance s between the first circuit board 210 and the second circuit board 220 ranging from s to 8mm to meet the minimum safe distance and ensure that motor wires can be run between them. Preferably, the first circuit board 210 also has a wire-holding groove 211 for fixing the position of the wire harness connected to the circuit board assembly 200, avoiding internal wiring chaos.

[0082] See Figure 2 , Figures 5 to 7 In some embodiments, a heat sink 620 communicating with an air duct is embedded in the circuit board frame 300, and the heat sink 620 is in contact with the transistor 243. When the transistor 243 is working, the heat dissipated can be dissipated into the air duct through the heat sink 620 to prevent the transistor 243 from overheating and malfunctioning. Specifically, the circuit board frame 300 has a hollow cavity 362 inside, and has an opening 361 at the lower end. The cavity 362 communicates with the inside of the handle 700 and is part of the air duct. The heat sink 620 is preferably a metal sheet with good thermal conductivity. A slot is provided in the circuit board frame 300 in the vertical direction, and the heat sink is inserted into the slot so that its bottom communicates with the cavity 362. Alternatively, the heat sink 620 and the circuit board frame 300 can also be integrally formed by injection molding. Furthermore, in some embodiments, the first plate 311 is located below the transistor 243, and the heat sink 620 is disposed on the first plate 311 so that the heat sink 620 is in contact with the bottom of the transistor 243.

[0083] See Figures 5 to 7 In some embodiments, the circuit board frame 300 is fixedly connected to the housing 100, and the circuit board assembly 200 is fixedly connected to the circuit board frame 300, thereby achieving fixed installation of the circuit board assembly 200. Specifically, in some embodiments, the circuit board assembly 200 and the circuit board frame 300 are fixedly connected by screws or other threaded fasteners. Specifically, the first circuit board 210 is fixedly connected to the circuit board frame 300; of course, the second circuit board 220 can also be fixedly connected to the circuit board frame 300. In other embodiments, the circuit board assembly 200 and the circuit board frame 300 can also be fixedly connected to the housing 100 respectively; specifically, the second circuit board 220 and the first circuit board 210 are respectively fixedly connected to the housing 100. Alternatively, the circuit board assembly 200 can also be fixedly connected to the end cover 120 to achieve fixed installation.

[0084] When the circuit board assembly 200 and the circuit board frame 300 are fixedly connected by screws or other threaded fasteners, preferably, in some embodiments, the circuit board frame 300 includes a fixing post 320 extending toward the circuit board assembly 200. The fixing post 320 is fixedly connected to the first circuit board 210, and the projection of the fixing post 320 along the axial direction of the housing 100 onto the first circuit board 210 is within the range of the first circuit board 210. This ensures that the fixing post 320 is radially located within the range of the circuit board assembly 200 and does not extend beyond the circuit board assembly 200, thus not increasing the radial dimension of the circuit board assembly 200. Specifically, the fixing post 320 is located near the edge of the circuit board frame 300, and a first notch 221 is provided at a corresponding position on the second circuit board 220 to avoid the fixing post 320. The fixing post 320 is connected to the first circuit board 210 by threaded fasteners. Preferably, multiple fixing posts 320 are provided, and the multiple fixing posts 320 are evenly distributed circumferentially to enhance the stability of the fixed connection. In some embodiments, the fixing post 320 extends axially along the housing 100, and in other embodiments, the extension direction of the fixing post 320 may also be inclined relative to the axial direction of the housing 100.

[0085] Preferably, in some embodiments, the circuit board frame 300 further includes a plurality of positioning members 330 extending toward the circuit board assembly 200. Each positioning member 330 is located radially outward of a fixing post 320, and the sidewall of the first circuit board 210 abuts against the plurality of positioning members 330. During fixed installation, when the circuit board assembly 200 is placed on the fixing post 320, the positioning members 330 can be used to position the first circuit board 210 to prevent its placement from shifting. Specifically, the positioning member 330 is plate-shaped, its height is greater than that of the fixing post 320, and it matches the shape and size of the outer sidewall of the first circuit board 210. As mentioned above, the first circuit board 210 can be a circular plate, and correspondingly, the positioning member 330 is set as an arc-shaped plate with a diameter slightly larger than that of the first circuit board 210, with a clearance fit between the two.

[0086] See Figure 2 and Figure 4In some embodiments, the circuit board assembly 200, circuit board frame 300, and heating element 400 are arranged sequentially along the axial direction. The circuit board frame 300 is fixedly connected to the heating element 400, and the heating element 400 is fixedly connected to the housing 100. The circuit board frame 300 separates the circuit board assembly 200 from the air duct. After the airflow enters through the air inlet 710 on the handle 700, it flows to the left, enters the cavity 362 inside the circuit board frame 300 through the connection between the handle 700 and the circuit board frame 300, and flows downward through the heating element 400 before exiting. When the heating element 400 is working and generating heat, it can blow out hot air. In addition to the above method, in other embodiments, the airflow flowing from the handle 700 into the main body 10 can also first pass through the circuit board assembly 200, then through the circuit board frame 300, and then through the heating element and other components before exiting.

[0087] For details, please refer to Figure 2 , Figure 4 , Figure 8 and Figure 11 , Figure 8 for Figure 1 A schematic diagram of the heating element in a hair drying device. Figure 11 for Figure 8 A partial structural diagram of the heating element 400 is shown. The heating element 400 includes an outer cylinder 410 and an inner cylinder 420. The outer cylinder 410 is fitted over the inner cylinder 420 and is fixedly connected to the outer casing 100. The circuit board frame 300 and the inner cylinder 420 are both fixedly connected to the outer cylinder 410. A heating wire 430 is disposed between the inner cylinder 420 and the outer cylinder 410. A water ion generator 500 is disposed inside the inner cylinder 420. Distributing the water ion generator 500 inside the inner cylinder 420 fully utilizes the internal space of the inner cylinder 420, increasing the structural compactness. Furthermore, the heating wire 430 is disposed between the inner cylinder 420 and the outer cylinder 410, and is insulated by the inner cylinder 420, minimizing its impact on the performance of the water ion generator 500.

[0088] For details, please refer to Figures 2 to 4 , Figures 8 to 10 , Figure 9 for Figure 8 A schematic diagram of the structure of components such as the inner cylinder of the heating element. Figure 10 for Figure 8A schematic diagram of the outer cylinder of the heating element. The inner cylinder 420 is hollow inside, with an open bottom and a perforated top, allowing airflow entering the cavity 362 to flow into the inner cylinder 420. The outer cylinder 410 is hollow inside, with an open top, and a central air outlet 417 at the center of the bottom end plate, and an annular outer air outlet 416 at the outer ring. The bottom of the outer casing 100 has an opening, and the end plate of the outer cylinder 410 protrudes from the opening at the bottom of the outer casing 100. The inner cylinder 420 and the outer cylinder 410 are engaged; for example, the inner wall of the end plate of the outer cylinder 410 has an annular second groove 415, and the bottom edge of the inner cylinder 420 is engaged in the second groove 415. The outer cylinder 410 is snapped into the outer shell 100. For example, the outer cylinder 410 has a ring-shaped third slot 418 at its bottom end, and the outer shell 100 has a ring-shaped hook 110 at its bottom end, which engages with the third slot 418. Preferably, the outer wall of the side plate of the outer cylinder 410 is also provided with axially extending limiting ribs, and a first limiting groove 412 is defined between the two limiting ribs. The inner wall of the outer shell 100 is provided with corresponding protruding ribs (omitted in the figure). During installation, the protruding ribs on the inner wall of the outer shell 100 are inserted into the first limiting groove 412 for limiting, so as to prevent circumferential rotation between the two. The outer cylinder 410 is also connected and fixed to the circuit board frame 300 by a snap-fit ​​connection. For example, the outer wall of the side plate of the outer cylinder 410 is provided with a first slot 411, and a corresponding position of the circuit board frame 300 is provided with a locking block 351, which engages with the first slot 411. Preferably, multiple sets of matching locking blocks 351 and first locking slots 411 are arranged circumferentially to enhance the stability of the fixed connection. Preferably, a sealing ring 640 is also embedded around the top of the outer cylinder 410 to enhance the sealing between it and the circuit board frame 300. Part of the airflow entering the cavity 362 from the handle 700 flows into the interior of the inner cylinder 420 from the top, flows through the water ion generator 500, and carries water ions out through the central air outlet 417. The other part flows between the inner cylinder 420 and the outer cylinder 410, flows through the heating wire 430, and is blown out through the outer ring air outlet 416.

[0089] See Figure 4 , Figure 7 and Figure 11In some embodiments, the heating element 400 further includes a temperature control device and a wire 460. The temperature control device includes a thermostat 451 and a fuse 452, which are electrically connected. The wire 460 passes sequentially through the inner cylinder 420 and the circuit board frame 300 and then connects to the circuit board assembly 200. The heating element 400, the temperature control device, and the circuit board assembly 200 are sequentially electrically connected to form a circuit. If the heating element 400 and the circuit board assembly 200 are considered external components other than the temperature control device, then the fuse 452 in the temperature control device is electrically connected to the external component via the wire 460, which is located inside the inner cylinder 420. Placing the wire 460 inside the inner cylinder 420 allows for efficient use of the internal space without increasing the radial dimension, resulting in a more compact structure. Furthermore, due to the heat insulation of the inner cylinder 420, the heating wire 430 will not overheat the wire 460 when it heats up. Therefore, there is no need to install additional heat insulation components such as mica sheets between the heating wire 430 and the wire 460, which not only reduces the number of components and lowers costs, but also makes the structure more compact. For details, please refer to... Figure 14 In some embodiments, the heating wire 430, circuit board assembly 200, and temperature control device are electrically connected end-to-end in a clockwise direction to form a circuit. Specifically, the fuse 452 in the temperature control device is electrically connected to the heating wire 430 in the external component via a wire 460, and the temperature controller 451 is electrically connected to the circuit board assembly 200 in the external component. Alternatively, see [link to relevant documentation]. Figure 15 In some embodiments, the heating wire 430, temperature control device, and circuit board assembly 200 are electrically connected end-to-end in a clockwise direction to form a circuit. Specifically, the fuse 452 in the temperature control device is electrically connected to the circuit board assembly 200 in the external component via a wire 460, and the thermostat 451 is electrically connected to the heating wire 430 in the external component. Further, in some embodiments, the heating wire 430 includes a first heating layer 431 and a second heating layer 432, which are electrically connected and arranged radially along the inner cylinder 420 and the outer cylinder 410. By providing a double heating layer, heating efficiency can be improved. Figure 14 In the illustrated embodiment, the second heating layer 432 is electrically connected to the fuse 452 via a wire 460, and the first heating layer 431 is electrically connected to the circuit board assembly 200; Figure 15 In the embodiment shown, the first heating layer 431 is electrically connected to the temperature controller 451, and the second heating layer 432 is electrically connected to the circuit board assembly 200.

[0090] If selected Figure 15 For the connection method shown, please refer to [link / reference]. Figure 2 , Figure 4 and Figure 7Preferably, in some embodiments, the circuit board frame 300 includes a protective tube 341 extending toward the heating element 400. The wire 460 passes through the protective tube 341 and connects to the circuit board assembly 200. The protective tube 341 can limit the wire 460, grouping them together and preventing internal wiring tangles. Similarly, the circuit board frame 300 also includes a second protective tube 343. The wiring harness of the motor 720 in the handle 700 extends into the circuit board frame 300 through the connection between the circuit board frame 300 and the handle 700, passes upward through the second protective tube 343, and connects to the circuit board assembly 200. Preferably, both the protective tube 341 and the second protective tube 343 are provided with wire plugs. The wire plugs have through holes for the wires to pass through, sealing the wire passage and improving the airtightness of the air duct, ensuring that the airflow in the cavity 362 can only flow downwards to the heating element 400. The wire plug can be made of rubber or silicone and is either interference-fitted to the wall of the cable sheath or bonded in place. (See also...) Figure 4 , Figure 7 and Figure 10 Preferably, in some embodiments, the protective tube 341 extends into the cavity 362, and its bottom end abuts against the end plate at the top of the inner cylinder 420, so that the inner cylinder 420 can be stably locked in the second slot 415 and is not prone to shaking.

[0091] See Figure 9 and Figure 11 The inner cylinder 420 has an inwardly recessed receiving groove 422 on its outer side wall, and the thermostat 451 is disposed within the receiving groove 422. Disposing of it within the receiving groove 422 makes efficient use of the space in the thicker part of the inner cylinder 420 wall, eliminating the need for additional space to accommodate the relatively long thermostat 451. Furthermore, the area on the inner side wall of the inner cylinder 420 corresponding to the receiving groove 422 extends inward to form a protrusion 423. This inward protrusion of the inner wall at this location compensates for the reduction in strength of the inner cylinder 420 caused by excavating the receiving groove 422 on the outer side wall of the inner cylinder 420.

[0092] See Figure 4 , Figures 9 to 12 , Figure 12 for Figure 11A schematic diagram of the water ion generator. Furthermore, a magnetic component 630 is provided at the bottom of the protrusion 423. The magnetic component 630 is used to attract the magnet on the nozzle, so as to fix the nozzle to the bottom end of the hair drying appliance body 10 and change the airflow effect. Any existing technology can be used for the nozzle, and no limitation is made here. The magnetic component 630 is snapped onto the end plate of the outer cylinder 410, and both ends are supported by the protrusion 423 and the end plate of the outer cylinder 410 respectively to achieve stable installation. Specifically, a first protrusion 413 and a second protrusion 414 are provided on the inner wall of the end plate of the outer cylinder 410, with the first protrusion 413 located radially outside the second protrusion 414. The magnetic component 630 is ring-shaped and is locked between the first protrusion 413 and the second protrusion 414. The bottom end of the protrusion 423 abuts against the magnetic component 630 to prevent the protrusion 423 from coming out from between the first protrusion 413 and the second protrusion 414.

[0093] Additionally, the water ion generator 500 is located above the magnetic component 630 and is fixedly connected to the inner cylinder 420. Specifically, a second fixing post 425 is provided on the inner side wall of the inner cylinder 420, and the water ion generator 500 is fixed to the second fixing post 425 by threaded fasteners. Specifically, the water ion generator 500 includes an emitting needle 510 and an emitting needle holder 520, which are fixedly connected. Water ions are emitted through the emitting needle 510, and the emitting needle holder 520 is fixed to the second fixing post 425 by threaded fasteners. The emitting needle holder 520 is provided with a third notch 521 to avoid the protruding part 423. The emitting needle holder 520 is also provided with a wire passage groove 522, through which the aforementioned wire 360 ​​passes and extends into the wire sheath 341 on the circuit board frame 300. Preferably, a limiting plate 424 is also provided on the inner side wall of the inner cylinder 420, and a second limiting groove 523 is provided on the launching needle holder 520. The limiting plate 424 is inserted into the second limiting groove 523 for limiting.

[0094] See Figure 13 , Figure 13This is a schematic diagram of the magnetic component and nutrient box in one embodiment of the present invention. In some embodiments, a nutrient box 650 is also provided at the end of the inner cylinder 420. The nutrient box 650 is fixed in a similar manner to the magnetic component 630, and is also snapped between the protrusion 423 and the end plate of the outer cylinder 410. The nutrient box 650 contains nutrients that can nourish and repair hair. The nutrients stored in the nutrient box 650 can be collagen, vitamins, or essential oils, etc. The nutrients can be in block form, or they can be powder wrapped in non-woven fabric. When using this hair drying tool to dry hair or pet hair, the nutrients will be blown out with the airflow and adhere to the surface of the hair or fur, providing care and repair. Preferably, both the nutrient box 650 and the magnetic component 630 are annular, and the ratio m of the central angle of the area occupied by the magnetic component 630 to the central angle of the area occupied by the nutrient box 650 is in the range of 1.5 ≤ m ≤ 2. In this way, the area of ​​the magnetic component 630 is sufficient, and there is enough magnetic attraction between it and the nozzle to ensure that the nozzle will not fall off. At the same time, it can blow out enough nutrients.

[0095] See Figure 8 , Figure 9 and Figure 11 The structure of other components in the heating element 400 is described below. An outer fixing plate 441 and an inner fixing plate 442 are fixed to the inner cylinder 420, with the outer fixing plate 441 located radially outside the inner fixing plate 442. Specifically, the inner cylinder 420 has a mounting groove 421, into which both the outer fixing plate 441 and the inner fixing plate 442 are inserted. Heating wires 430 are wound around both the outer fixing plate 441 and the inner fixing plate 442. Specifically, in the heating wires 430, a first heating layer 431 is wound around the outer fixing plate 441, and a second heating layer 432 is wound around the inner fixing plate 442. Specifically, the outer fixing plate 441 has serrations 4411, and the first heating layer 431 is wound around the serrations 4411; similarly, the inner fixing plate 442 also has serrations. Preferably, a heat insulation cylinder 443 is provided between the outer fixing plate 441 and the inner fixing plate 442 to separate the first heating layer 431 and the second heating layer 432, preventing a short circuit caused by contact between the first heating layer 431 and the second heating layer 432 when the hair drying device collides. Specifically, the outer fixing plate 441 has a second notch 4412, and the heat insulation cylinder 443 is inserted into the second notch 4412. Similarly, the inner fixing plate 442 also has a notch for inserting the heat insulation cylinder 443. A heat insulation sheet 470 is also provided on the inner wall of the outer cylinder 410 to separate the heating wire 430 from the outer cylinder 410, preventing the user from being burned by excessively high temperatures in the outer cylinder 410. The heat insulation sheet 470, the outer fixing plate 441, and the inner fixing plate 442 can all be made of mica material.

[0096] See Figure 2The following describes the other components within the housing 100. A touchscreen assembly 610 is also provided above the circuit board assembly 200, which includes a touchscreen and circuit board components, enabling UI interaction via the touchscreen. Specifically, an end cap 120 is fixed to the top of the housing 100, and the two are snap-fitted together. The touchscreen is fixed to the end cap 120, and the two can be ultrasonically welded. The touchscreen is made of transparent PC, with laser-engraved patterns and interactive buttons sprayed onto its surface. The circuit board of the touchscreen assembly 610 is connected to the end cap 120 via threaded fasteners. The circuit board is electrically connected to the circuit board assembly 200 via a wiring harness, and also electrically connected to the touchscreen via a wiring harness. Preferably, a buffer is provided between the circuit board of the touchscreen assembly 610 and the circuit board assembly 200 for cushioning. Specifically, cushioning foam can be attached to the bottom of the circuit board of the touchscreen assembly 610. When using the device, the user only needs to hold the handle and touch the touchscreen to complete the UI interaction, making operation very convenient.

[0097] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A hair drying tool, characterized in that, include: A handle (700) is provided with a motor (720) inside the handle (700); A housing (100) is connected to the handle (700); A circuit board assembly (200) is disposed within the housing (100) and has a plurality of components thereon; A circuit board frame (300) is disposed inside the housing (100), the circuit board assembly (200) and the circuit board frame (300) are arranged along the axial direction of the housing (100), the circuit board frame (300) is provided with a recessed portion that is recessed in a direction away from the circuit board assembly (200), and at least a portion of the components extend into the recessed portion; A heating element (400) is provided, wherein the circuit board assembly (200), the circuit board frame (300), and the heating element (400) are arranged sequentially along the axial direction; the heating element (400) includes an outer cylinder (410) and an inner cylinder (420), the outer cylinder (410) being sleeved on the outside of the inner cylinder (420), and a heating wire (430) being disposed between the inner cylinder (420) and the outer cylinder (410); the heating element (400) also includes a temperature control device and a wire (460), the temperature control device including a temperature controller (451) and a fuse (452) electrically connected to each other, the circuit board assembly (200), the heating wire (430), and the temperature control device being electrically connected sequentially to form a circuit, with the circuit board assembly... (200) and the heating wire (430) are external components. The fuse (452) is electrically connected to the external component via the wire (460), which is disposed inside the inner cylinder (420). The circuit board frame (300) includes a protective tube (341) extending toward the heating component (400), through which the wire (460) passes. The circuit board frame (300) has an opening (361) on the side near the heating component (400). The interior of the circuit board frame (300) is hollow to form a cavity (362). The protective tube (341) extends into the cavity (362), and the end of the protective tube (341) abuts against the inner cylinder (420). The circuit board assembly (200) includes a first circuit board (210) and a second circuit board (220) spaced apart along the axial direction. The second circuit board (220) is located between the first circuit board (210) and the circuit board frame (300). Among the plurality of components, some are disposed on the first circuit board (210) and some are disposed on the second circuit board (220). The projection of the second circuit board (220) along the axial direction at least partially overlaps with the projection of the first circuit board (210) along the axial direction. Let the vertical distance of the element extending along the axial direction be the height of the element. Along the axial direction, the area outside the projection area on the first circuit board (210) from the second circuit board (220) is defined as the first area. Among the elements disposed on the first circuit board (210), the height of at least a portion of the elements in the first area is greater than the height of the elements in the projection area; the height of at least a portion of the elements disposed on the first circuit board (210) in the first area is greater than the height of the elements disposed on the second circuit board (220).

2. The hair drying tool according to claim 1, characterized in that, Let the vertical distance of the element extending along the axial direction be the height of the element, and the height of at least a portion of the element whose projection along the axial direction is located within the recess is greater than the height of the element whose projection is located outside the recess.

3. The hair drying tool according to claim 1, characterized in that, The circuit board frame (300) includes a first plate (311) and a second plate (312). Along the axial direction, the distance between the second plate (312) and the circuit board assembly (200) is greater than the distance between the first plate (311) and the circuit board assembly (200). At least a portion of the components are projected onto the second plate (312) along the axial direction.

4. The hair drying tool according to claim 3, characterized in that, The first plate (311) and the second plate (312) have a smooth transition. The hair drying appliance includes an air duct. The circuit board frame (300) separates the circuit board assembly (200) from the air duct. Airflow flows radially into the side of the circuit board frame (300) away from the circuit board assembly (200) along the outer shell (100) and flows out axially along the outer shell (100).

5. The hair drying tool according to claim 1, characterized in that, The component, whose height is not less than the distance between the first circuit board (210) and the second circuit board (220), is disposed on the first circuit board (210) and located in the first region.

6. The hair drying apparatus according to claim 1, characterized in that, Of the components disposed on the first circuit board (210), at least a portion of the components located in the first region extend into the recess.

7. The hair drying tool according to claim 1, characterized in that, The circuit board frame (300) includes a first plate (311) and a second plate (312). Along the axial direction, the distance between the second plate (312) and the circuit board assembly (200) is greater than the distance between the first plate (311) and the circuit board assembly (200). At least some of the components disposed on the second circuit board (220) are attached to the first plate (311), and at least some of the components disposed on the first circuit board (210) are attached to the second plate (312).

8. The hair drying apparatus according to claim 1, characterized in that, The first circuit board (210) is provided with at least a capacitor (241) and a negative ion generator (242), and the capacitor (241) and the negative ion generator (242) are located in the first area.

9. The hair drying apparatus according to claim 1, characterized in that, The second circuit board (220) has at least one transistor (243).

10. The hair drying apparatus according to claim 9, characterized in that, The hair drying device includes an air duct, and a heat sink (620) connected to the air duct is embedded on the circuit board frame (300), and the heat sink (620) is in contact with the transistor (243).

11. The hair drying apparatus according to claim 1, characterized in that, The circuit board assembly (200) is fixedly connected to the circuit board frame (300).

12. The hair drying apparatus according to claim 11, characterized in that, The circuit board frame (300) includes a fixing post (320) extending toward the circuit board assembly (200), the fixing post (320) being fixedly connected to the first circuit board (210), and the projection of the fixing post (320) along the axial direction being within the range of the first circuit board (210).

13. The hair drying apparatus according to claim 12, characterized in that, The circuit board frame (300) includes a plurality of positioning elements (330) extending toward the circuit board assembly (200), each of the positioning elements (330) being connected to the outside of one of the fixing posts (320), and the sidewall of the first circuit board (210) abutting against the plurality of positioning elements (330).

14. The hair drying apparatus according to claim 11, characterized in that, The circuit board frame (300) is fixedly connected to the heating component (400), and the heating component (400) is fixedly connected to the outer casing (100).

15. The hair drying apparatus according to claim 14, characterized in that, The outer cylinder (410) is fixedly connected to the circuit board frame (300), and a water ion generator (500) is installed inside the inner cylinder (420).

16. The hair drying apparatus according to claim 15, characterized in that, The inner cylinder (420) has an inwardly recessed receiving groove (422) on its outer side wall, and the temperature controller (451) is located in the receiving groove (422).

17. The hair drying apparatus according to claim 16, characterized in that, The area on the inner wall of the inner cylinder (420) corresponding to the receiving groove (422) extends inward to form an extension (423).

18. The hair drying apparatus according to claim 17, characterized in that, It also includes a magnetic component (630). The outer cylinder (410) includes an outer cylinder side plate and an outer cylinder end plate. The outer cylinder side plate is radially disposed on the outside of the inner cylinder (420). The outer cylinder end plate is located at the outer end of the protrusion (423). The magnetic component (630) is engaged between the protrusion (423) and the outer cylinder end plate.

19. The hair drying apparatus according to claim 18, characterized in that, It also includes a nutrient box (650), which, along with the magnetic component (630), is engaged between the protrusion (423) and the outer cylinder end plate.

20. The hair drying apparatus according to claim 19, characterized in that, Both the nutrient box (650) and the magnetic component (630) are annular, and the ratio m of the central angle of the area occupied by the magnetic component (630) to the central angle of the area occupied by the nutrient box (650) is in the range of 1.5≤m≤2.

21. The hair drying apparatus according to claim 8, characterized in that, The maximum diameter d of the first circuit board (210) is in the range of 60mm≤d≤65mm, the distance s between the first circuit board (210) and the second circuit board (220) is in the range of s≥8mm, and the height h of the capacitor (241) is in the range of 22mm≤h≤24mm.

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