Folding air duct

Abstract

The folding air duct comprises a shell, a fan assembly and a heating device, the shell comprises an air duct part and a handheld part, the air duct part is provided with an air outlet and a first air duct communicated with the air outlet, the air outlet is located at one end of the air duct part, and one end of the handheld part is rotationally installed at the end, away from the air outlet, of the air duct part. The handheld part is arranged in the air duct part and has a use state and a storage state, in the use state, an included angle is formed between the handheld part and the air duct part, and in the storage state, the handheld part extends along the axis of the air duct part so as to form a straight cylinder shape with the air duct part; the fan assembly is arranged on the shell and used for driving airflow to be blown out of the air outlet after passing through the first air duct. The heating device comprises a silicon carbide heating body which is arranged in the first air channel, and the surface of the silicon carbide heating body forms a heat exchange surface so as to exchange heat with airflow flowing through the first air channel. According to the technical scheme, the occupied space of the folding air duct during storage can be reduced, and storage is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of hair drying devices, in particular to a foldable 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. Due to the "T" and "7" shaped design of traditional hair dryers, and the heating device structure of the traditional hair dryer consisting of an insulating bracket and an electric heating wire wound on the insulating bracket, the overall size of the hair dryer is large, which occupies a large space when stored, and is not convenient to carry during travel, which is very inconvenient in actual use. Utility Model Content

[0003] The main purpose of the utility model is to provide a folding hair dryer, aiming to reduce the occupied space of the folding hair dryer when it is stored, so as to facilitate storage.

[0004] To achieve the above-mentioned purpose, the foldable hair dryer proposed by the utility model comprises:

[0005] The housing comprises an air duct portion and a hand-held portion, wherein the air duct portion is provided with an air outlet and a first air duct connected to the air outlet, wherein the air outlet is located at one end of the air duct portion, and one end of the hand-held portion is rotatably mounted on an end of the air duct portion away from the air outlet, and has a use state and a storage state, wherein in the use state, the hand-held portion and the air duct portion are arranged at an angle, and in the storage state, the hand-held portion extends along the axis of the air duct portion to form a straight tube shape with the air duct portion;

[0006] a fan assembly, disposed in the housing, for driving the airflow through the first air duct and then blowing out from the air outlet; and

[0007] The heating device comprises a silicon carbide heating element, wherein the silicon carbide heating element is arranged in the first air duct, 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, the air duct portion has a first end face, the first end face is inclined relative to the length direction of the air duct portion, the first end face is provided with a first rotating part, the hand-held part has a second end face corresponding to the first end face, and the second end face is provided with a second rotating part cooperating with the first rotating part.

[0009] Optionally, the first rotating part is provided with a through hole, and the through hole communicates with the first air duct and the inner cavity of the handheld part.

[0010] Optionally, a second air duct is provided in the hand-held part, an air inlet is provided at one end of the hand-held part away from the air duct part, and the second air duct connects the through hole and the air inlet; the fan assembly is arranged in the first air duct or the second air duct.

[0011] Optionally, the folding air duct further includes a circuit assembly, and the circuit assembly is at least partially disposed in the second air duct; and / or the silicon carbide heating element is located between the air outlet and the fan assembly.

[0012] Optionally, the foldable air duct further includes an air outlet accessory, and the air outlet accessory is detachably mounted at the air outlet.

[0013] Optionally, the air outlet accessory is an air nozzle; or, the air outlet accessory is a comb head, and a plurality of comb teeth and a plurality of air flow outlets are provided on the periphery of the comb head.

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

[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. While ensuring the heating effect, it can reduce the space occupied in the air duct part, thereby reducing the size of the air duct part. One end of the handheld part is rotatably installed on the end of the air duct part away from the air outlet, so that the folding hair dryer has a storage state in which the handheld part and the air duct part form a straight tube shape. In this way, the space occupied by the folding hair dryer can be greatly reduced when stored, which is convenient for storage and travel. 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 This is a schematic structural diagram of an embodiment of the foldable hair dryer of the utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of the middle folding air duct in the storage state;

[0025] Figure 3 for Figure 1 Schematic diagram of the structure of the middle wind channel;

[0026] Figure 4 for Figure 1 A schematic diagram of the structure of the middle handheld part;

[0027] Figure 5 for Figure 1 Schematic diagram of the structure of the middle folding air duct when the air outlet accessories are installed;

[0028] Figure 6 for Figure 1 A cross-sectional view of the middle folding air duct;

[0029] Figure 7 A cross-sectional view of another embodiment of the foldable hair dryer of the utility model;

[0030] Figure 8 A cross-sectional view of another embodiment of the foldable hair dryer of the utility model;

[0031] Fig. 9 This is a cross-sectional view of another embodiment of the foldable hair dryer of the utility model;

[0032] Fig.10 for Figure 1 Schematic diagram of the structure of the silicon carbide heating element;

[0033] Fig.11 for Fig.10 A schematic diagram of the structure of the silicon carbide heating element from another angle;

[0034] Fig.12 This is a schematic diagram of the structure of a silicon carbide heating element in another embodiment of the foldable hair dryer of the utility model;

[0035] Fig.13 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the subject of the utility model;

[0036] Fig.14 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0037] Fig.15 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0038] Fig.16 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model.

[0039] Description of Figure Numbers:

[0040] 11. Air duct; 111. First air duct; 112. Air outlet; 113. First end surface; 114. First rotating part; 115. Through hole; 12. Hand-held part; 121. Air inlet; 122. Second air duct; 123. Second inclined surface; 124. Second rotating part; 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. Raised rib; 40. Circuit assembly; 50. Heat insulation component; 60. Air outlet accessories

[0041] 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

[0042] 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.

[0043] 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.

[0044] 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.

[0045] The utility model provides a foldable hair dryer.

[0046] In the embodiment of the present utility model, Figures 1 to 6 As shown, the foldable air duct includes a shell, a fan assembly 20 and a heating device. The shell includes an air duct portion 11 and a handheld portion 12. The air duct portion 11 is provided with an air outlet 112 and a first air duct 111 connected to the air outlet 112. The air outlet 112 is located at one end of the air duct portion 11. One end of the handheld portion 12 is rotatably mounted on the end of the air duct portion 11 away from the air outlet 112. The handheld portion 12 has a use state and a storage state. In the use state, the handheld portion 12 is connected to the air duct portion 11. The hand-held portion 12 is arranged at an angle thereto. In the retracted state, the hand-held portion 12 extends along the axis of the air duct portion 11 to form a straight cylindrical shape with the air duct portion 11; the fan assembly 20 is arranged in the shell to drive the air flow through the first air duct 111 and then blown out from the air outlet 112; the heating device includes a silicon carbide heating element 30, which is arranged in the first air duct 111, and the surface of the silicon carbide heating element 30 forms a heat exchange surface to exchange heat with the air flow flowing through the first air duct 111.

[0047] Specifically, the folding wind tube also includes a circuit assembly 40, 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.

[0048] 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 folding 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 gap wall surface formed by the silicon carbide heating element 30 and the inner wall surface of the through hole.

[0049] 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.

[0050] 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, can quickly generate heat, and can achieve rapid heating of the outlet 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. While ensuring the heating effect, it can reduce the space occupied in the air duct part 11, thereby reducing the size of the air duct part 11. One end of the hand-held part 12 is rotatably installed on the end of the air duct part 11 away from the air outlet 112, so that the folding hair dryer has a storage state in which the hand-held part 12 and the air duct part 11 form a straight tube shape. In this way, the space occupied by the folding hair dryer can be greatly reduced when stored, which is convenient for storage and travel.

[0051] In some embodiments, the air duct portion 11 has a first end face 113, which is inclined relative to the length direction of the air duct portion 11, and the first end face 113 is provided with a first rotating portion 114. The hand-held portion 12 has a second end face corresponding to the first end face 113, and the second end face is provided with a second rotating portion 124 that cooperates with the first rotating portion 114.

[0052] Specifically, the axes of the first rotating portion 114 and the second rotating portion 124 are substantially perpendicular to the first end face 113 and the second end face, so that the first end face 113 and the second end face can be correspondingly fitted, and the gap between the first end face 113 and the second end face can be reduced, thereby effectively preventing foreign objects from getting stuck between the ends of the air duct portion 11 and the handheld portion 12, and improving the rotation reliability of the handheld portion 12. Among them, one of the first rotating portion 114 and the second rotating portion 124 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 114 and the second rotating portion 124 can also be a rotating connection installed between the connecting portion 36 and the handheld portion 12.

[0053] In addition, in other embodiments, the hand-held portion 12 and the connecting portion 36 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 .

[0054] In some embodiments, the first rotating portion 114 is provided with a through hole 115, which connects the first air duct 111 and the inner cavity of the handheld portion 12. This facilitates the passage of wires in the handheld portion 12 and the first air duct 111, and also avoids damage to the connecting wires when the handheld portion 12 is rotated.

[0055] In some embodiments, a second air duct 122 is provided in the handheld portion 12, and an air inlet 121 is provided at one end of the handheld portion 12 away from the air duct portion 11, and the second air duct 122 is connected to the through hole 115 and the air inlet 121; the fan assembly 20 is provided in the first air duct 111 (refer to Figure 6 ), or the fan assembly 20 is arranged in the second air duct 122 (reference Figure 7 or Figure 8 That is, the hand-held portion 12 can be used to set the air inlet 121 and the second air duct 122, so that the internal space of the hand-held portion 12 can be fully utilized.

[0056] Optionally, at least one of the end surface and the peripheral side of the handheld portion 12 is provided with an air inlet 121. That is, the air inlet 121 can be provided on the peripheral side of the handheld portion 12, the air inlet 121 can be provided on the end surface of the handheld portion 12, or the air inlet 121 can be provided on both the peripheral side and the end surface of the handheld portion 12.

[0057] In some embodiments, the folding wind tube further includes a circuit assembly 40, which is at least partially disposed in the second air duct 122 (refer to Figure 8 ); In this way, the circuit component 40 can be kept away from the silicon carbide heating element 30, and heat can be dissipated by the airflow passing through the second air duct 122. In other embodiments, the circuit component 40 is at least partially disposed in the first air duct 111 (refer to Fig. 9 ).

[0058] In some embodiments, the silicon carbide heating element 30 is located between the air outlet 112 and the fan assembly 20. This can prevent the hot air flow from passing through the fan assembly 20, prevent the fan assembly 20 from overheating, and also better dissipate heat for the fan assembly 20.

[0059] In some embodiments, the folding air duct further includes an air outlet accessory 60, which is detachably mounted at the air outlet 112. In this way, the user can rotate and install the air outlet accessory 60 for use as needed, which increases the application scenarios of the folding air duct. For example, when the air outlet accessory 60 is in the storage state, the air outlet accessory 60 can be installed at the air outlet 112 for use. The air outlet accessory 60 can be fixed at the air outlet 112 by magnetic attraction or snapped at the air outlet 112.

[0060] The air outlet accessory 60 may be in various forms. For example, in some embodiments, the air outlet accessory 60 is an air nozzle, such as a diffuser, a collector, or an anti-flying nozzle. In other embodiments, the air outlet accessory 60 is a comb head, and a plurality of comb teeth and a plurality of air flow outlets are provided on the periphery of the comb head, and the air flow outlets are located between the comb teeth. Comb teeth and air flow outlets may be provided on only one side or two opposite sides of the periphery of the comb head, or comb teeth and air flow outlets may be provided on the outer periphery of the comb head.

[0061] In some embodiments, the folding air duct also includes a heat insulating component 50, which is disposed 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 air duct portion 11, 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 disposed in the channel, and its material can be ABS plastic, PP plastic or heat insulating foam, etc.

[0062] In some embodiments, a convex rib 38 is provided on the outer circumference of the silicon carbide heating element 30, and a slot is provided in the heat insulating component 50, 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 in a state where the convex rib 38 corresponds to the slot.

[0063] The specific structure of the silicon carbide heating element 30 can be various, for example, Fig.10 and Fig.11 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.

[0064] 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.

[0065] In some other embodiments, reference Fig.12 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.

[0066] In some other embodiments, reference Fig.13 The silicon carbide heating element 30 is provided with a plurality of air flow holes 302, which 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 111, and the outer side and the central area of ​​the silicon carbide heating element 30 are respectively provided with connection parts 37.

[0067] In some other embodiments, reference Fig.14 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 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.14 ); or multiple connecting portions 36 are staggeredly connected (reference Fig.15 or Fig.16 ).

[0068] Optionally, the central portion 35 is provided with a plurality of airflow holes 115, and the extension direction of the airflow holes 115 is consistent with the airflow direction in the first air duct 111. This can also make the heat exchange area of ​​the silicon carbide heating element 30 larger and improve the heat exchange efficiency.

[0069] 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.

[0070] 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 foldable hair dryer, characterized in that: include: The housing comprises an air duct portion and a hand-held portion, wherein the air duct portion is provided with an air outlet and a first air duct connected to the air outlet, wherein the air outlet is located at one end of the air duct portion, and one end of the hand-held portion is rotatably mounted on an end of the air duct portion away from the air outlet, and has a use state and a storage state, wherein in the use state, the hand-held portion and the air duct portion are arranged at an angle, and in the storage state, the hand-held portion extends along the axis of the air duct portion to form a straight tube shape with the air duct portion; A fan assembly, disposed in the housing, for driving the airflow through the first air duct and then blowing out from the air outlet; as well as The heating device comprises a silicon carbide heating element, wherein the silicon carbide heating element is arranged in the first air duct, 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 foldable hair dryer according to claim 1, characterized in that: The air duct portion has a first end face, the first end face is inclined relative to the length direction of the air duct portion, the first end face is provided with a first rotating part, the hand-held part has a second end face corresponding to the first end face, and the second end face is provided with a second rotating part cooperating with the first rotating part.

3. The foldable hair dryer according to claim 2, characterized in that: The first rotating part is provided with a through hole, and the through hole is connected with the first air duct and the inner cavity of the handheld part.

4. The foldable hair dryer according to claim 3, characterized in that: A second air duct is provided in the hand-held part, an air inlet is provided at one end of the hand-held part away from the air duct part, and the second air duct is connected with the through hole and the air inlet; the fan assembly is arranged in the first air duct or the second air duct.

5. The foldable hair dryer according to claim 4, characterized in that: The folding air duct further includes a circuit assembly, which is at least partially disposed in the second air duct; and / or the silicon carbide heating element is located between the air outlet and the fan assembly.

6. The foldable hair dryer according to claim 1, characterized in that: The folding air duct also includes an air outlet accessory, and the air outlet accessory is detachably installed at the air outlet.

7. The foldable hair dryer according to claim 6, characterized in that: The air outlet accessory is an air nozzle; or, the air outlet accessory is a comb head, and a plurality of comb teeth and a plurality of air flow outlets are arranged around the comb head.

8. The foldable 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 foldable hair dryer according to claim 1, characterized in that: The silicon carbide heating element comprises a spiral body and at least two connection parts, both ends of the spiral body are provided with the connection parts, and a ventilation gap is formed between two adjacent spiral sections 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 a wiring portion is provided at the free end of each second heating segment; 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 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; 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 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 foldable hair dryer according to claim 1, characterized in that: The folding air duct further includes a heat insulating component, which is arranged in the air duct portion and surrounds the circumference of the silicon carbide heating element.

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