Air duct

Abstract

The utility model discloses an air duct which comprises a shell, a fan assembly and a heating device, the shell comprises a handheld part and an air duct part arranged at one end of the handheld part, the air duct part is provided with a first air duct, and one end of the air duct part is provided with an air outlet communicated with the first air duct; the fan assembly is installed in the shell and used for driving airflow to flow through the first air channel and then be blown out of the air outlet. The heating device comprises a silicon carbide heating body, the silicon carbide heating body is arranged in the first air channel, the silicon carbide heating body is provided with at least two spaced wiring parts, and a heat exchange surface is formed on the surface of the silicon carbide heating body so as to exchange heat with airflow flowing through the first air channel. According to the technical scheme, the structure of the heating device can be simplified, and the size of the air duct is reduced.

Description

Technical Field

[0001] The utility model relates to the field of hair drying devices, in particular to a hair dryer. Background Art

[0002] At present, hair dryers have become personal care products frequently used in daily life, mainly used for hair drying and hair styling, etc. In the heating device of a traditional hair dryer, a heating wire wound on an insulating bracket is generally used for heating. During production, the heating wire and the insulating bracket need to be manufactured separately, and then the heating wire is wound on the insulating bracket. Such a heating device has a complex structure and a large size, resulting in a large size of the hair dryer. Utility Model Content

[0003] The main purpose of the utility model is to provide a wind tube, aiming to simplify the structure of the heating device and reduce the size of the wind tube.

[0004] To achieve the above-mentioned purpose, the wind tube proposed by the utility model comprises:

[0005] The housing comprises a handheld portion and an air duct portion provided at one end of the handheld portion, wherein the air duct portion is provided with a first air duct, and one end of the air duct portion is provided with an air outlet connected to the first air duct;

[0006] a fan assembly installed in the housing and configured to drive airflow through the first air duct and then blow out from the air outlet; and

[0007] The heating device comprises a silicon carbide heating element, which is arranged in the first air duct. The silicon carbide heating element is provided with at least two spaced-apart wiring parts, and the surface of the silicon carbide heating element forms a heat exchange surface for heat exchange with the airflow flowing through the first air duct.

[0008] Optionally, an air inlet is provided at one end of the air duct portion away from the air outlet, the air inlet is communicated with the first air duct, and the fan assembly is arranged in the first air duct.

[0009] Optionally, the handheld part is provided with a second air duct, the second air duct is connected to the first air duct, the handheld part is provided with an air inlet at one end away from the air duct part, the air inlet is connected to the second air duct, and the fan assembly is arranged in the second air duct or the first air duct.

[0010] Optionally, the fan assembly is arranged between the silicon carbide heating element and the air inlet.

[0011] Optionally, the silicon carbide heating element is arranged adjacent to the air outlet.

[0012] Optionally, the air duct further includes a heat insulating component, which is installed in the air duct portion and surrounds the circumference of the silicon carbide heating element.

[0013] Optionally, a convex rib is provided on the outer peripheral surface of the silicon carbide heating element, and a slot is provided on the inner side of the heat insulation component. The slot extends along the axial direction of the heat insulation component, and the convex rib is correspondingly inserted into the slot.

[0014] Optionally, the silicon carbide heating element as a whole is a columnar structure extending along the length direction of the first air duct.

[0015] Optionally, the silicon carbide heating element comprises a spiral body and at least two connection parts, the connection parts are provided at both ends of the spiral body, and a ventilation gap is formed between two adjacent spiral segments of the spiral body;

[0016] Optionally, the silicon carbide heating element comprises a first heating segment and two second heating segments, the first heating segment is connected between the two second heating segments, the two second heating segments both extend outwardly in a spiral from the first heating segment, a ventilation gap is formed between the two second heating segments, and a wiring portion is provided at the free end of each second heating segment;

[0017] Optionally, the silicon carbide heating element comprises an outer ring portion, a central portion located within the outer ring portion, and a plurality of connecting portions connected between the central portion and the outer ring portion, the plurality of connecting portions are spaced apart along the circumference of the central portion or the plurality of connecting portions are staggered and connected, a ventilation gap is formed between two adjacent connecting portions, the outer ring portion and the central portion are respectively provided with a wiring portion; the central portion is provided with a plurality of airflow holes, and the extension direction of the airflow holes is consistent with the flow direction of the airflow in the first air duct;

[0018] Optionally, the silicon carbide heating element is provided with a plurality of air flow holes, the air flow holes are arranged to be through-through at both ends, the extension direction of the air flow holes is consistent with the flow direction of the air flow in the first air duct, and the outer side and the central area of ​​the silicon carbide heating element are respectively provided with wiring parts;

[0019] Optionally, the silicon carbide heating element includes a plurality of heating segments connected in sequence, and any two adjacent heating segments are arranged at an angle, and a ventilation gap is formed between any two heating segments.

[0020] Optionally, the hair dryer further comprises a circuit assembly, wherein the circuit assembly is disposed in the hand-held portion, and the silicon carbide heating element and the fan assembly are both electrically connected to the circuit assembly.

[0021] The technical solution of the utility model adopts a silicon carbide heating element, so that the surface of the silicon carbide heating element is used as a heat exchange surface to directly exchange heat with the airflow flowing through the air duct. The silicon carbide heating element has a high thermal efficiency and can quickly generate heat, so that the outlet airflow can be quickly heated. Compared with the transmission electric heating wire heating device, the silicon carbide heating element is an integrated structure with a simple structure and a small size, which can reduce the length of the heating device, that is, while ensuring the heating effect, it can reduce the occupied space in the air duct, thereby reducing the size of the wind tube, which is convenient for users to use and store. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A cross-sectional view of an embodiment of a blower of the utility model;

[0024] Figure 2 A cross-sectional view of another embodiment of the wind tube of the utility model;

[0025] Figure 3 This is a structural schematic diagram of another embodiment of the hair dryer of the utility model;

[0026] Figure 4 for Figure 3 Cross-sectional view of the stroke tube;

[0027] Figure 5 for Figure 4 A schematic diagram of the structure of the middle cylinder and the first circuit board;

[0028] Figure 6 This is a structural schematic diagram of another embodiment of the wind tube of the utility model;

[0029] Figure 7 for Figure 6 Schematic diagram of the structure on the other side of the stroke cylinder;

[0030] Figure 8 for Figure 6 Cross-sectional view of the stroke tube;

[0031] Fig. 9 This is a structural schematic diagram of another embodiment of the utility model wind tube

[0032] Fig.10 for Fig. 9 Cross-sectional view of the stroke tube;

[0033] Fig.11 for Fig. 9 Schematic diagram of the structure of the stroke tube in the storage state;

[0034] Fig.12 for Fig.11 Cross-sectional view of the stroke tube;

[0035] Fig.13 for Fig. 9 Schematic diagram of the structure of the middle wind channel;

[0036] Fig.14 for Fig. 9 A schematic diagram of the structure of the middle handheld part;

[0037] Fig.15 for Figure 1 Schematic diagram of the structure of the silicon carbide heating element;

[0038] Fig.16 for Fig.15 A schematic diagram of the structure of the silicon carbide heating element from another angle;

[0039] Fig.17 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the wind tube of the utility model;

[0040] Fig.18 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the subject of the utility model;

[0041] Fig.19 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0042] Fig. 20 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0043] Fig.21 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model.

[0044] Description of Figure Numbers:

[0045] 11. air duct; 111. first air duct; 112. air outlet; 114. connecting portion; 115. first inclined surface; 116. first rotating portion; 117. second through hole; 12. hand-held portion; 121. second inclined surface; 122. second rotating portion; 123. second air duct; 13. air inlet; 132. through hole; 14. air inlet; 20. fan assembly; 30. silicon carbide heating element; 301. ventilation gap; 302. air flow hole; 31, first heating section; 32, second heating section; 33, heating section; 34, outer ring; 35, center; 36, connecting part; 37, wiring part; 38, convex rib; 40, circuit assembly; 41, first circuit board; 42, second circuit board; 43, third circuit board; 44, key assembly; 45, indicator light; 50, heat insulation component; 60, cylinder; 61, first through hole; 62, sealing structure; 63, fixing groove

[0046] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0050] The utility model provides a hair dryer.

[0051] In the embodiment of the present utility model, Figure 1 As shown, the hair dryer includes a shell, a fan assembly 20 and a heating device. The shell includes a hand-held portion 12 and an air duct portion 11 arranged at one end of the hand-held portion 12. The air duct portion 11 is provided with a first air duct 111. One end of the air duct portion 11 is provided with an air outlet 112 connected to the first air duct 111.

[0052] The fan assembly 20 is installed in the housing to drive the air flow to flow through the first air duct 111 and then blow out from the air outlet 112 .

[0053] The heating device includes a silicon carbide heating element 30 . The silicon carbide heating element 30 is disposed in the first air duct 111 . The surface of the silicon carbide heating element 30 forms a heat exchange surface for heat exchange with the airflow flowing through the first air duct 111 .

[0054] Specifically, the wind tube also includes a circuit assembly 40 (refer to Figure 4 ), the fan assembly 20 and the heating device (silicon carbide heating element 30) are both electrically connected to the circuit assembly 40, and the circuit assembly 40 has a circuit structure such as a controller and a power supply circuit. The specific circuit structure can refer to the prior art, and the utility model will not repeat it one by one. Optionally, the circuit assembly 40 is also provided with a power cord, and the power cord is connected to an external power supply; or the circuit assembly 40 is provided with a power interface, and the power interface is used to connect the power cord.

[0055] The silicon carbide heating element 30 is a heating structure as a whole, that is, there are at least two spaced connection parts 37 on the silicon carbide heating element 30, and the power supply circuit is connected through at least two connection parts 37. After the power is turned on, the current flows through the silicon carbide heating element 30, thereby converting the electrical energy into thermal energy. When the airflow flows through the surface of the silicon carbide heating element 30, the airflow can be heat-exchanged with the silicon carbide heating element 30, so that the airflow flowing through the silicon carbide heating element 30 can be heated. Compared with the electric heating wire, even if the hair dryer is used for a long time, it will not cause the silicon carbide heating element 30 to be disconnected. The surface of the silicon carbide heating element 30 refers to the surface of the silicon carbide heating element 30 that is exposed to the air and can contact the airflow, including the wall surface of the gap formed by the silicon carbide heating element 30 and the inner wall surface of the through hole.

[0056] The silicon carbide heating element 30 can be made by mixing silicon carbide powder as the main sintering phase raw material with one or more conductive phase raw materials of titanium nitride powder, zirconium nitride powder, titanium carbonitride powder, titanium carbide powder, zirconium carbide powder, thallium carbide powder, hafnium carbide powder, titanium boride powder, zirconium boride powder, molybdenum silicide powder and tungsten carbide powder, and then molding and sintering according to the designed shape. For example, silicon carbide powder, yttrium oxide powder, aluminum oxide powder and titanium boride powder can be uniformly mixed in a certain mass ratio, and then water is added as a solvent, and a ball mill is used to uniformly mix, and then spray dried, and the dry powder and paraffin are heated and mixed in a certain mass ratio, and poured into a hot die casting machine to complete hot die casting. After the blank is dried, it is placed in a sintering furnace for sintering to obtain the silicon carbide heating element 30.

[0057] The technical solution of the utility model adopts a silicon carbide heating element 30, so that the surface of the silicon carbide heating element 30 is used as a heat exchange surface to directly exchange heat with the airflow flowing through the air duct, and the silicon carbide heating element 30 has a high thermal efficiency and can quickly generate heat, and can quickly heat the airflow. Compared with the transmission electric heating wire heating device, the silicon carbide heating element 30 is an integrated structure with a simple structure and a small size, which can reduce the length of the heating device, that is, while ensuring the heating effect, it can reduce the occupied space in the air duct part 11, thereby reducing the size of the wind tube, which is convenient for users to use and store.

[0058] Optionally, the first air duct 111 extends in a direction from one end of the air duct portion 11 to the other end to match the shape of the air duct portion 11, so that the space inside the air duct portion 11 can be fully utilized to form the first air duct 111, thereby improving the structural compactness of the air duct portion 11.

[0059] In some embodiments, reference Figure 3 and Figure 4 Or refer to Figures 8 to 12 The air duct portion 11 is provided with an air inlet 14 at one end away from the air outlet 112, the air inlet 14 is connected to the first air duct 111, and the fan assembly 20 is arranged in the first air duct 111. In this way, when the airflow enters the first air duct 111 from the air inlet 14, it can flow directly to the air outlet 112, which can reduce the loss and improve the air outlet speed.

[0060] Optionally, at least one of the end surface and the peripheral side of the air duct portion 11 is provided with an air inlet 14. That is, the air inlet 14 can be provided on the peripheral side of the air duct portion 11, the air inlet 14 can also be provided on the end surface of the air duct portion 11, or the air inlet 14 can also be provided on both the peripheral side and the end surface of the air duct portion 11.

[0061] In some embodiments, reference Figure 2The handheld portion 12 is provided with a second air duct 123, which is communicated with the first air duct 111. An end of the handheld portion 12 away from the air duct portion 11 is provided with an air inlet 14, which is communicated with the second air duct 123. The fan assembly 20 is arranged in the second air duct 123 or the first air duct 111. In this way, the space in the handheld portion 12 can be fully utilized, which is conducive to reducing the size of the air duct portion 11, thereby reducing the overall size of the hair dryer, which is convenient for users to hold, use and store.

[0062] Optionally, at least one of the end surface and the peripheral side of the hand-held portion 12 is provided with an air inlet 14. That is, the air inlet 14 can be provided on the peripheral side of the hand-held portion 12, the air inlet 14 can also be provided on the end surface of the hand-held portion 12, or the air inlet 14 can also be provided on both the peripheral side and the end surface of the hand-held portion 12.

[0063] In some embodiments, the fan assembly 20 is disposed between the silicon carbide heating element 30 and the air inlet 14. In this way, when in use, the airflow first passes through the fan assembly 20 and then passes through the silicon carbide heating element 30, so that the hot airflow can be prevented from passing through the fan assembly 20, the fan assembly 20 can be prevented from overheating, and the fan assembly 20 can also be cooled.

[0064] In some embodiments, the silicon carbide heating element 30 is disposed adjacent to the air outlet 112. This makes the silicon carbide heating element 30 closer to the air outlet 112, which can reduce the flow path of the hot air flow heated by the silicon carbide heating element 30 in the air duct, thereby reducing heat loss.

[0065] In some embodiments, reference Figure 4 , Figure 8 or Fig.10 The air duct also includes a heat insulating component 50, which is installed in the air duct portion 11 and surrounds the circumference of the silicon carbide heating element 30. This can reduce the heat conduction of the silicon carbide heating element 30 to the outer surface of the handheld portion 12, which is beneficial to reduce heat loss and prevent the handheld portion 12 from overheating and scalding the user or causing discomfort during use. The heat insulating component 50 is formed in a cylindrical shape, and a channel with two ends passing through is formed inside. The silicon carbide heating element 30 is arranged in the channel, and its material can be ABS plastic, PP plastic or heat insulating foam, etc.

[0066] In some embodiments, the outer peripheral surface of the silicon carbide heating element 30 is provided with a convex rib 38 (such as Fig.15 and Fig.16 As shown in FIG. 1 , a slot is provided in the heat insulating component 50, and the slot extends along the axial direction of the heat insulating component 50, and the convex rib 38 is correspondingly inserted into the slot. Specifically, the slot extends to one end of the heat insulating component 50 or the end of the slot close to one end of the heat insulating component 50 is open, so that the silicon carbide heating element 30 can be installed into the heat insulating component 50 from one end of the heat insulating component 50 with the convex rib 38 corresponding to the slot.

[0067] In some embodiments, a plurality of ribs 38 are disposed on the outer circumference of the heat insulating component 50 . The ribs 38 abut against the inner wall of the handle 12 to form a heat insulating cavity between adjacent ribs 38 , which can further enhance the heat insulating effect of the heat insulating component 50 .

[0068] In some embodiments, the hair dryer also includes a circuit assembly 40, which is disposed in the hand-held portion 12. The silicon carbide heating element 30 and the fan assembly 20 are both electrically connected to the circuit assembly 40. This allows full utilization of the space in the hand-held portion 12, helps reduce the size of the air duct portion 11, and thus reduces the overall size of the hair dryer, making it easier for users to hold, use, and store it.

[0069] In some embodiments, reference Figures 3 to 5 , an air inlet 14 is provided at one end of the air duct portion 11, and an air outlet 112 is provided at the other end. The circuit assembly 40 is arranged in the hand-held portion 12, and has a first circuit board 41 extending into the first air duct 111. The fan assembly 20 and the silicon carbide heating element 30 are both electrically connected to the first circuit board 41, and the first circuit board 41 is located between the silicon carbide heating element 30 and the fan assembly 20. The first circuit board 41 is partially extended into the first air duct 111 of the air duct portion 11, and the first circuit board 41 is installed using the space in the air duct portion 11, which improves the space utilization rate in the air duct, so that the size of the first circuit board 41 in the hand-held portion 12 can be reduced, thereby reducing the size of the hand-held portion 12, so that it is convenient for users to hold and use.

[0070] In some embodiments, a cylinder 60 is provided in the air channel portion 11, a first air channel 111 is formed in the cylinder 60, a first through hole 61 is provided on the side wall of the cylinder 60, the first circuit board 41 passes through the first through hole 61 and extends into the first air channel 111, and a sealing structure 62 is provided between the first through hole 61 and the first circuit board 41. In this way, the cylinder 60 can be used to separate the first air channel 111 from the inner cavity of the handheld portion 12 to prevent airflow from flowing into the handheld portion 12. By providing a sealing structure 62 between the first through hole 61 and the first circuit board 41, airflow leakage between the first through hole 61 and the first circuit board 41 can be prevented. Optionally, the sealing structure 62 is a silicone sealing ring or a sealing foam.

[0071] In some embodiments, the first circuit board 41 is located on the axis of the first air duct 111, and the first circuit board 41 is parallel to the axis of the first air duct 111. In this way, the first circuit board 41 can reduce the obstruction of the airflow in the first air duct 111 and reduce the airflow loss. Of course, in other embodiments, the first circuit board 41 can also be attached to the inner wall surface of the first air duct 111.

[0072] In some embodiments, a fixing groove 63 is further provided in the air duct tube, the fixing groove 63 is opposite to the first via hole 61, and the end of the first circuit board 41 is inserted into the fixing groove 63. In this way, the first circuit board 41 can be fixed well, and the first circuit board 41 is prevented from shaking under the action of high-speed airflow, thereby improving the installation stability and reliability of the first circuit board 41.

[0073] In some embodiments, the circuit assembly 40 further includes a second circuit board 42, which is electrically connected to the first circuit board 41, and the second circuit board 42 is in the shape of a long strip extending along the length direction of the handheld portion 12. In this way, the space occupied by the second circuit board 42 in the radial direction of the handheld portion 12 can be reduced, and the diameter of the handheld portion 12 can be reduced.

[0074] Furthermore, the circuit assembly 40 further includes a third circuit board 43, which is electrically connected to the second circuit board 42, and is in the shape of a strip extending along the length direction of the handheld portion 12, and is perpendicular to the second circuit board 42. In this way, the widths of the first circuit board 41 and the second circuit board 42 can be reduced, so that the second circuit board 42 and the third circuit board 43 are fully arranged in the space inside the handheld portion 12, and the diameter of the handheld portion 12 can be reduced. Of course, in other embodiments, only the first circuit board 41 may be provided.

[0075] In some embodiments, the circuit assembly 40 further includes a key assembly 44 and a plurality of indicator lights 45, and the key assembly 44 and the plurality of indicator lights 45 are arranged along the length direction of the handheld portion 12. Arranging the key assembly 44 and the plurality of indicator lights 45 along the length direction of the handheld portion 12 in this way can make full use of the space in the length direction of the handheld portion 12, which is conducive to reducing the diameter of the handheld portion 12.

[0076] In some embodiments, the silicon carbide heating element 30 is disposed between the air outlet 112 and the first circuit board 41. This can prevent the hot air flow from passing through the first circuit board 41 and the fan assembly 20, prevent the first circuit board 41 and the fan assembly 20 from overheating, and can also better dissipate heat for the first circuit board 41 and the fan assembly 20. When designing the circuit, the electronic components with a larger heat generation can be arranged in the part of the first circuit board 41 located in the first air duct 111, so as to utilize the outlet air flow for heat dissipation.

[0077] In some embodiments, reference Figures 6 to 8 The housing further includes an air inlet 13 connected between the air duct portion 11 and the hand-held portion 12, and air inlets 14 connected to the first air duct 111 are provided on opposite sides of the air inlet 13. By providing air inlets 14 connected to the first air duct 111 on opposite sides of the air inlet 13, the air intake volume can be increased, thereby increasing the air volume of the air duct and improving the use effect.

[0078] In some embodiments, the air inlet 13 is further provided with a through hole 132, the through hole 132 penetrates two opposite sides of the air inlet 13, the air inlet 14 surrounds the outer periphery of the through hole 132, and the hole wall of the through hole 132 is provided with an air inlet hole connected to the first air duct 111. In this way, the air inlet area can be further increased and the air inlet volume can be improved.

[0079] In some embodiments, the air inlet 13 is cylindrical. In this way, when the airflow enters the air inlet 13 from the air inlet 14, it can flow smoothly to the first air duct 111, which can reduce losses. The side wall of the air inlet 13 can be a straight wall or a curved wall.

[0080] In some embodiments, the air channel portion 11 and the hand-held portion 12 are arranged on one side of the air inlet portion 13 close to the air outlet 112. In this way, the center of gravity of the air duct can be close to the hand-held portion 12, so that the user can hold and use it.

[0081] In some embodiments, reference Figures 9 to 14 The fan assembly 20 is arranged in the first air duct 111, and the hand-held part 12 is rotatably mounted on one side of the air duct part 11, and has a use state of being unfolded relative to the air duct part 11 and a storage state close to the side of the air duct part 11. By rotatably mounting the hand-held part 12 on one side of the air duct part 11, the hand-held part 12 has a use state of being unfolded relative to the air duct part 11 and a storage state close to the side of the air duct part 11. When not in use, the hand-held part 12 can be rotated to the storage state, so that the air duct part 11 and the hand-held part 12 are close to and parallel to each other, so that the hair dryer occupies less space when stored, and is convenient for storage and travel.

[0082] In some embodiments, a (first) connecting portion 114 is provided on the side of the air duct portion 11, and the connecting portion 114 is provided with a first inclined surface 115, the first inclined surface 115 is inclined relative to the length direction of the air duct portion 11, and the first inclined surface 115 is provided with a first rotating portion 116, and the end of the handheld portion 12 is provided with a second inclined surface 121 corresponding to the first inclined surface 115, and the second inclined surface 121 is provided with a second rotating portion 122 that cooperates with the first rotating portion 116. Specifically, the axes of the first rotating portion 116 and the second rotating portion 122 are substantially perpendicular to the first inclined surface 115 and the second inclined surface 121, so that the first inclined surface 115 and the second inclined surface 121 can be correspondingly fitted, and the gap between the first inclined surface 115 and the second inclined surface 121 can be reduced, so that foreign objects can be effectively prevented from being stuck between the connecting portion 114 and the end of the handheld portion 12, and the rotation reliability of the handheld portion 12 is improved. Among them, one of the first rotating portion 116 and the second rotating portion 122 is provided with a rotating shaft, and the other is provided with an axial hole that cooperates with the rotating shaft. In other embodiments, the first rotating portion 116 and the second rotating portion 122 may also be rotating connecting members installed between the connecting portion 114 and the hand-held portion 12 .

[0083] In addition, in other embodiments, the hand-held portion 12 and the connecting portion 114 are connected via a rotating shaft, and the rotating shaft is perpendicular to the length direction of the handle and the length direction of the air duct portion 11 .

[0084] In some embodiments, the connection portion 36 is arranged near the air inlet 14 relative to the air outlet 112, and the first inclined surface 115 is located on the side of the connection portion 114 near the air outlet 112. In the storage state, the hand-held portion 12 is located on the side of the connection portion 114 facing the air outlet 112. Specifically, the distance from the end surface of the air duct portion 11 where the air outlet 112 is located to the connection portion 114 is greater than the distance from the other end surface of the air duct portion 11 to the connection portion 114, so that the hand-held portion 12 and the air duct portion 11 have more overlapping parts in the length direction of the air duct portion 11 in the storage state, thereby preventing the hair dryer from being too long in the storage state.

[0085] In some embodiments, the hair dryer further includes a circuit assembly 40, which is at least partially disposed in the handheld portion 12, and the first rotating portion 116 is provided with a second through hole 117, and the fan assembly 20 and the silicon carbide heating element 30 are both electrically connected to the circuit assembly 40. This facilitates wire passing and can also prevent the connection wire from being damaged when the handheld portion 12 is rotated.

[0086] In some embodiments, the first circuit board 41 is entirely located in the air duct portion 11 , and the connecting wires between the first circuit board 41 and the second circuit board 42 pass through the second via 117 . This facilitates wiring and reduces the risk of the connecting wires being damaged by the rotation of the handheld portion 12 .

[0087] The specific structure of the silicon carbide heating element 30 can be various, for example, Fig.15 and Fig.16 In some embodiments, the silicon carbide heating element 30 includes a spiral body and at least two connection parts 37, both ends of the spiral body are provided with connection parts 37, and a ventilation gap 301 is formed between two adjacent spiral sections of the spiral body. With such a configuration, the surface area of ​​the silicon carbide heating element 30 can be larger under the same volume, and the contact area with the airflow can be increased, thereby improving the heat exchange efficiency. Among them, the silicon carbide heating element 30 can be a planar spiral structure or a tower-shaped spiral structure.

[0088] Optionally, the silicon carbide heating element 30 includes a first heating section 31 and two second heating sections 32, the first heating section 31 is connected between the two second heating sections 32, the two second heating sections 32 both extend outwardly in a spiral from the first heating section 31, a ventilation gap 301 is formed between the two second heating sections 32, and a wiring portion 37 is provided at the free end of each second heating section 32. That is, the two second heating sections 32 extend outwardly in a spiral from the first heating section 31 in parallel, so that the free ends of the two second heating sections 32 are both located on the outside, that is, the wiring portions 37 of the silicon carbide heating element 30 are both located on the outside, which makes it easier to connect the wiring while increasing the heat exchange area by utilizing the spiral structure.

[0089] In some other embodiments, reference Fig.17 The silicon carbide heating element 30 includes a plurality of heating segments 33 connected in sequence, and each of the two adjacent heating segments 33 is arranged at an angle, and a ventilation gap 301 is formed between any two heating segments 33. That is, the plurality of heating segments 33 form a bending structure according to a certain rule, so that the heat exchange area of ​​the silicon carbide heating element 30 can be increased.

[0090] In some other embodiments, reference Fig.18 The silicon carbide heating element 30 is provided with a plurality of air flow holes 302, and the air flow holes 302 are through-through at both ends. The extension direction of the air flow holes 302 is consistent with the flow direction of the air flow in the first air duct 123, and the outer side and the central area of ​​the silicon carbide heating element 30 are respectively provided with connection parts 37.

[0091] In some other embodiments, reference Fig.18 The silicon carbide heating element 30 includes an outer ring portion 34, a central portion 35 located inside the outer ring portion 34, and a plurality of (second) connecting portions 36 connected between the central portion 35 and the outer ring portion 34. A ventilation gap 301 is formed between two adjacent connecting portions 36. The outer ring portion 34 and the central portion 35 are respectively provided with a wiring portion 37. Optionally, the plurality of connecting portions 36 are spaced apart along the circumference of the central portion 35 (refer to Fig.18 ); or multiple connecting portions 36 are staggeredly connected (reference Fig. 20 or Fig.21 ).

[0092] Optionally, the central portion 35 is provided with a plurality of airflow holes, and the extension direction of the airflow holes is consistent with the airflow direction in the first air duct 123. This can also make the heat exchange area of ​​the silicon carbide heating element 30 larger, and can improve the heat exchange efficiency.

[0093] In some embodiments, the silicon carbide heating element 30 is a columnar structure extending along the length direction of the air duct. That is, the silicon carbide heating element 30 has a certain height. Such a configuration can increase the length of the ventilation gap 301 / airflow hole 302 in the silicon carbide heating element 30, that is, the surface area of ​​the silicon carbide heating element 30 can be increased, the heat exchange area of ​​the silicon carbide heating element 30 is increased, and the heat exchange efficiency is improved.

[0094] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A hair dryer, characterized in that: include: The housing comprises a handheld portion and an air duct portion provided at one end of the handheld portion, wherein the air duct portion is provided with a first air duct, and one end of the air duct portion is provided with an air outlet connected to the first air duct; A fan assembly, installed in the housing, for driving airflow to flow through the first air duct and then blow out from the air outlet; as well as The heating device comprises a silicon carbide heating element, which is arranged in the first air duct. The silicon carbide heating element is provided with at least two spaced-apart wiring parts, and the surface of the silicon carbide heating element forms a heat exchange surface for heat exchange with the airflow flowing through the first air duct.

2. The hair dryer according to claim 1, characterized in that: An air inlet is provided at one end of the air duct portion away from the air outlet. The air inlet is communicated with the first air duct. The fan assembly is arranged in the first air duct.

3. The hair dryer according to claim 1, characterized in that: The handheld part is provided with a second air duct, which is connected to the first air duct. An air inlet is provided at one end of the handheld part away from the air duct part, which is connected to the second air duct. The fan assembly is arranged in the second air duct or the first air duct.

4. The hair dryer according to claim 2 or 3, characterized in that: The fan assembly is arranged between the silicon carbide heating element and the air inlet.

5. The hair dryer according to claim 1, characterized in that: The silicon carbide heating element is arranged adjacent to the air outlet.

6. The hair dryer according to claim 1, characterized in that: The wind tube also includes a heat insulation component, which is installed in the air duct portion and surrounds the circumference of the silicon carbide heating element.

7. The hair dryer according to claim 6, characterized in that: The outer peripheral surface of the silicon carbide heating element is provided with a convex rib, and the inner side of the heat insulation component is provided with a slot, the slot extends along the axial direction of the heat insulation component, and the convex rib is correspondingly inserted into the slot.

8. The hair dryer according to claim 1, characterized in that: The silicon carbide heating element is in a columnar structure extending along the length direction of the first air duct as a whole.

9. The hair dryer according to claim 1, characterized in that: The silicon carbide heating element comprises a spiral body and at least two connecting parts, both ends of the spiral body are provided with the connecting parts, and a ventilation gap is formed between two adjacent spiral segments of the spiral body; Alternatively, the silicon carbide heating element comprises a first heating segment and two second heating segments, the first heating segment is connected between the two second heating segments, the two second heating segments both extend outwardly in a spiral from the first heating segment, a ventilation gap is formed between the two second heating segments, and the free end of each second heating segment is provided with the wiring portion; Alternatively, the silicon carbide heating element comprises an outer ring portion, a central portion located within the outer ring portion, and a plurality of connecting portions connected between the central portion and the outer ring portion, the plurality of connecting portions are spaced apart along the circumference of the central portion or the plurality of connecting portions are staggered and connected, a ventilation gap is formed between two adjacent connecting portions, the outer ring portion and the central portion are respectively provided with the wiring portion; the central portion is provided with a plurality of airflow holes, and the extending direction of the airflow holes is consistent with the airflow direction in the first air duct; Alternatively, the silicon carbide heating element is provided with a plurality of air flow holes, the air flow holes are arranged to be through-through at both ends, the extension direction of the air flow holes is consistent with the flow direction of the air flow in the first air duct, and the outer side and the central area of ​​the silicon carbide heating element are respectively provided with the wiring parts; Alternatively, the silicon carbide heating element comprises a plurality of heating segments connected in sequence, two adjacent heating segments are arranged at an angle, and a ventilation gap is formed between any two heating segments.

10. The hair dryer according to claim 1, characterized in that: The hair dryer further comprises a circuit assembly, wherein the circuit assembly is arranged in the hand-held part, and the silicon carbide heating element and the fan assembly are both electrically connected to the circuit assembly.

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