Folding air duct

Abstract

The utility model discloses a folding air duct which 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 inlet, an air outlet and an air outlet duct located between the air inlet and the air outlet, and the handheld part is rotationally installed on one side of the air duct part. The air duct part has a use state of being unfolded relative to the air duct part and a storage state of being close to the side surface of the air duct part; the fan assembly is arranged in the air outlet duct; the heating device comprises a silicon carbide heating body, the silicon carbide heating body is arranged in the air outlet duct, 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 air outlet duct. According to the technical scheme, the size of the folding air duct can be reduced, and storage is convenient.

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. 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, which makes the overall size of the hair dryer large and inconvenient to store. Utility Model Content

[0003] The main purpose of the utility model is to provide a foldable hair dryer, aiming to reduce the size of the foldable hair dryer and 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 inlet, an air outlet, and an air outlet duct located between the air inlet and the air outlet, and the hand-held portion is rotatably mounted on one side of the air duct portion and has a use state of being unfolded relative to the air duct portion and a storage state close to the side of the air duct portion;

[0006] A fan assembly is disposed in the air outlet duct; and

[0007] The heating device comprises a silicon carbide heating element, wherein the silicon carbide heating element is arranged in the air outlet duct, and the surface of the silicon carbide heating element forms a heat exchange surface for heat exchange with the air flow passing through the air outlet duct.

[0008] Optionally, a connecting portion is provided on the side of the air duct portion, the connecting portion is provided with a first inclined surface, the first inclined surface is inclined relative to the length direction of the air duct portion, the first inclined surface is provided with a first rotating portion, and the end of the hand-held portion is provided with a second inclined surface corresponding to the first inclined surface, and the second inclined surface is provided with a second rotating portion cooperating with the first rotating portion.

[0009] Optionally, the connecting portion is arranged close to the air inlet, the first inclined surface is located on a side of the connecting portion close to the air outlet, and in the storage state, the hand-held portion is located on a side of the connecting portion facing the air outlet.

[0010] Optionally, the folding hair dryer further comprises a circuit assembly, wherein the circuit assembly is at least partially disposed in the hand-held portion, the first rotating portion is provided with a wire hole, and the fan assembly and the silicon carbide heating element are both electrically connected to the circuit assembly.

[0011] Optionally, the circuit assembly further includes a first circuit board and a second circuit board, wherein the first circuit board is disposed in the handheld portion, and the second circuit board is disposed in the air outlet duct, and a connecting line between the first circuit board and the second circuit board passes through the wire hole.

[0012] Optionally, the second circuit board is located between the silicon carbide heating element and the fan assembly.

[0013] 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;

[0014] 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;

[0015] 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 airflow direction in the air outlet duct;

[0016] Optionally, the silicon carbide heating element is provided with a plurality of air flow holes, the air flow holes are arranged through both ends, the extension direction of the air flow holes is consistent with the air flow direction in the air outlet duct, and the outer side and the central area of ​​the silicon carbide heating element are respectively provided with wiring parts;

[0017] 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.

[0018] Optionally, the silicon carbide heating element as a whole is a columnar structure extending along the length direction of the air outlet duct.

[0019] Optionally, the silicon carbide heating element is located between the air outlet and the fan assembly.

[0020] Optionally, the folding air duct further includes a heat insulating component, wherein the heat insulating component 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. By rotating the hand-held part to one side of the air duct part, the hand-held part has a use state in which it is unfolded relative to the air duct part and a storage state close to the side of the air duct part. When not in use, the hand-held part can be rotated to the storage state, so that the air duct part and the hand-held part are close to and parallel, so that the folding hair dryer occupies a small space 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 cross-sectional view of the middle folding air duct;

[0025] Figure 3 for Figure 1 A schematic diagram of the structure of the middle folding air duct in the storage state;

[0026] Figure 4 for Figure 3 A cross-sectional view of the middle folding air duct;

[0027] Figure 5 for Figure 1 Schematic diagram of the structure of the middle wind channel;

[0028] Figure 6 for Figure 1 A schematic diagram of the structure of the middle handheld part;

[0029] Figure 7 for Figure 1 Schematic diagram of the structure of the silicon carbide heating element;

[0030] Figure 8 for Figure 7 A schematic diagram of the structure of the silicon carbide heating element from another angle;

[0031] Fig. 9 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;

[0032] Fig.10 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the subject of the utility model;

[0033] Fig.11 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0034] Fig.12 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

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

[0036] Description of Figure Numbers:

[0037] 11. Air duct; 111. Air outlet duct; 112. Air inlet; 113. Air outlet; 114. Connecting part; 115. First inclined surface; 116. First rotating part; 117. Through hole; 12. Hand-held part; 121. Second inclined surface; 122. 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; 41. First circuit board; 42. Second circuit board; 50. Heat insulation component

[0038] 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

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The utility model provides a foldable hair dryer.

[0043] In the embodiment of the present utility model, Figures 1 to 8 As shown, the folding wind tube comprises:

[0044] The housing includes an air duct portion 11 and a hand-held portion 12. The air duct portion 11 is provided with an air inlet 112, an air outlet 113, and an air outlet duct 111 located between the air inlet 112 and the air outlet 113. The hand-held portion 12 is rotatably mounted on one side of the air duct portion 11 and has a use state of being unfolded relative to the air duct portion 11 and a storage state close to the side of the air duct portion 11.

[0045] The fan assembly 20 is disposed in the air outlet duct 111; and

[0046] The heating device includes a silicon carbide heating element 30 . The silicon carbide heating element 30 is disposed in the air outlet duct 111 . The surface of the silicon carbide heating element 30 forms a heat exchange surface for heat exchange with the air flow passing through the air outlet 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] Optionally, at least one of the end surface and the peripheral side of the air duct portion 11 is provided with an air inlet 112. That is, the air inlet 112 can be provided on the peripheral side of the air duct portion 11, the air inlet 112 can also be provided on the end surface of the air duct portion 11, or the air inlet 112 can also be provided on both the peripheral side and the end surface of the air duct portion 11.

[0049] 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.

[0050] 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.

[0051] 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 occupied space in the air duct part 11, thereby reducing the size of the air duct part 11. By rotating the handheld part 12 to one side of the air duct part 11, the handheld part 12 has a use state of unfolding 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 handheld part 12 can be rotated to the storage state, so that the air duct part 11 and the handheld part 12 can be close and parallel, so that the folding hair dryer can occupy a small space when stored, which is convenient for storage and travel.

[0052] 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 .

[0053] 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 .

[0054] In some embodiments, the connection portion 36114 is disposed close to the air inlet 112, and the first inclined surface 115 is located on the side of the connection portion 114 close to the air outlet 113. In the retracted state, the hand-held portion 12 is located on the side of the connection portion 114 facing the air outlet 113. Specifically, the distance from the end surface of the air duct portion 11 where the air outlet 113 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 retracted state, thereby preventing the folded hair dryer from being too long in the retracted state.

[0055] In some embodiments, the folding 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 wire hole, 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.

[0056] In some embodiments, the circuit assembly 40 further includes a first circuit board 41 and a second circuit board 42. The first circuit board 41 is disposed in the handheld portion 12, and the second circuit board 42 is disposed in the air outlet duct 111. The connection wires between the first circuit board 41 and the second circuit board 42 pass through the wire holes. This facilitates the wiring of the heating device in the air outlet duct 111 and also facilitates the setting of buttons on the handheld portion 12.

[0057] In some embodiments, the silicon carbide heating element 30 is disposed between the air outlet 113 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.

[0058] In some embodiments, the second circuit board 42 is located between the silicon carbide heating element 30 and the fan assembly 20. This can prevent the hot air flow from passing through the fan assembly 20 and the second circuit board 42, prevent the fan assembly 20 and the second circuit board 42 from overheating, and can also better dissipate heat for the fan assembly 20 and the second circuit board 42. The electronic components with high heat generation can also be arranged on the second circuit board 42 to improve the heat dissipation effect of the electronic components.

[0059] In some embodiments, the folding air duct further 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 conducive to reducing heat loss.

[0060] 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.

[0061] The specific structure of the silicon carbide heating element 30 can be various, for example, Figure 7 and Figure 8 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.

[0062] 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.

[0063] In some other embodiments, reference Fig. 9 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.

[0064] In some other embodiments, reference Fig.10 The silicon carbide heating element 30 is provided with a plurality of air flow holes 302, and the air flow holes 302 are through-set at both ends. The extension direction of the air flow holes 302 is consistent with the flow direction of the air flow in the air outlet duct 111, and the outer side and the central area of ​​the silicon carbide heating element 30 are respectively provided with connection parts 37.

[0065] In some other embodiments, reference Fig.11 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.11 ); or multiple connecting portions 36 are staggeredly connected (reference Fig.12 or Fig.13 ).

[0066] Optionally, the central portion 35 is provided with a plurality of airflow holes 117, and the extension direction of the airflow holes 117 is consistent with the airflow direction in the air outlet duct 111. This can also make the heat exchange area of ​​the silicon carbide heating element 30 larger and improve the heat exchange efficiency.

[0067] In some embodiments, the silicon carbide heating element 30 is in a cylindrical 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.

[0068] 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 inlet, an air outlet, and an air outlet duct located between the air inlet and the air outlet, and the hand-held portion is rotatably mounted on one side of the air duct portion and has a use state of being unfolded relative to the air duct portion and a storage state close to the side of the air duct portion; A fan assembly is arranged in the air outlet duct; as well as The heating device comprises a silicon carbide heating element, wherein the silicon carbide heating element is arranged in the air outlet duct, and the surface of the silicon carbide heating element forms a heat exchange surface for heat exchange with the air flow passing through the air outlet duct.

2. The foldable hair dryer according to claim 1, characterized in that: A connecting portion is provided on the side of the air duct portion, and the connecting portion is provided with a first inclined surface, which is inclined relative to the length direction of the air duct portion, and the first inclined surface is provided with a first rotating portion. The end of the hand-held portion is provided with a second inclined surface corresponding to the first inclined surface, and the second inclined surface is provided with a second rotating portion that cooperates with the first rotating portion.

3. The foldable hair dryer according to claim 2, characterized in that: The connecting portion is arranged close to the air inlet, the first inclined surface is located on a side of the connecting portion close to the air outlet, and in the storage state, the hand-held portion is located on a side of the connecting portion facing the air outlet.

4. The foldable hair dryer according to claim 2, characterized in that: The folding hair dryer also includes a circuit assembly, which is at least partially arranged in the handheld part. The first rotating part is provided with a wire hole, and the fan assembly and the silicon carbide heating element are both electrically connected to the circuit assembly.

5. The foldable hair dryer according to claim 4, characterized in that: The circuit assembly also includes a first circuit board and a second circuit board, wherein the first circuit board is disposed in the handheld portion, and the second circuit board is disposed in the air outlet duct, and a connecting line between the first circuit board and the second circuit board passes through the line hole.

6. The foldable hair dryer according to claim 5, characterized in that: The second circuit board is located between the silicon carbide heating element and the fan assembly.

7. 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, wherein the plurality of connecting portions are spaced apart along the circumference of the central portion or are staggeredly connected, and a ventilation gap is formed between two adjacent connecting portions, and 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 air outlet 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 air flow direction in the air outlet 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.

8. The foldable hair dryer according to claim 7, characterized in that: The silicon carbide heating element is in a columnar structure extending along the length direction of the air outlet duct.

9. The foldable hair dryer according to claim 1, characterized in that: The silicon carbide heating element is located between the air outlet and the fan assembly.

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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