New air duct

Abstract

The present invention discloses a novel hair dryer, which comprises a housing, a fan assembly and a heating device. The housing includes a handheld part and an air duct part provided at one end of the handheld part. The air duct part is provided with a first air duct, and the handheld part is provided with a second air duct communicating with the first air duct. The first air duct and the second air duct are arranged at an angle. The fan assembly is arranged in the second air duct to drive air flow to flow through the second air duct and the first air duct in sequence. The heating device includes a silicon carbide heating element, which is arranged at the corner between the second air duct and the first air duct. The surface of the silicon carbide heating element forms a heat exchange surface to perform heat exchange with the air flow flowing from the second air duct to the first air duct. The technical solution of the present invention can simplify the structure of the heating device and improve the space utilization rate inside the novel hair dryer.

Description

Technical Field

[0001] The present invention relates to the field of hair drying devices, and particularly to a novel hair dryer. Background Art

[0002] At present, hair dryers have become personal care products frequently used in daily life, mainly for drying hair and styling hair, etc. In the heating device of traditional hair dryers, generally, an electric heating wire wound around an insulating bracket is used for heating. During production, the electric heating wire and the insulating bracket need to be manufactured separately, and then the electric heating wire is wound around the insulating bracket. Such a heating device has a complex structure, a large size, limited installation positions, and it is difficult to make full use of the internal space of the hair dryer. Summary of the Invention

[0003] The main object of the present invention is to propose a novel hair dryer, aiming to simplify the structure of the heating device and improve the utilization rate of the internal space of the novel hair dryer.

[0004] To achieve the above object, the novel hair dryer proposed by the present invention includes:

[0005] A housing, including a handheld part and an air duct part provided at one end of the handheld part. The air duct part is provided with a first air duct, and the handheld part is provided with a second air duct communicating with the first air duct. The first air duct and the second air duct are arranged at an angle;

[0006] A fan assembly, provided in the second air duct, for driving air flow to flow through the second air duct and the first air duct in sequence; and

[0007] A heating device, including a silicon carbide heating element. The silicon carbide heating element is provided at the corner between the second air duct and the first air duct. A heat exchange surface is formed on the surface of the silicon carbide heating element for heat exchange with the air flow flowing from the second air duct to the first air duct.

[0008] Optionally, the corner between the first air duct and the second air duct is an arc-shaped channel.

[0009] Optionally, the silicon carbide heating element is bent and adapted to be installed at the corner between the first air duct and the second air duct. A bent flow channel is formed in the silicon carbide heating element.

[0010] Optionally, the heating device includes a plurality of the silicon carbide heating elements. The plurality of silicon carbide heating elements are provided at the corner between the first air duct and the second air duct and are arranged at intervals along the direction from the second air duct to the first air duct.

[0011] Optionally, the second air duct penetrates through the inner wall of the first air duct to communicate with the first air duct.

[0012] Optionally, the new hair dryer further includes a heat insulation component, which is correspondingly installed at the corner between the second air duct and the first air duct and surrounds the periphery of the silicon carbide heating element.

[0013] Optionally, the silicon carbide heating element includes a spiral main body and at least two wiring parts. The wiring parts are provided at both ends of the spiral main body, and ventilation gaps are formed at intervals between adjacent spiral segments of the spiral main body;

[0014] Optionally, the silicon carbide heating element includes a first heating section and two second heating sections. The first heating section is connected between the two second heating sections. The two second heating sections both spirally extend outward from the first heating section, and ventilation gaps are formed at intervals between the two second heating sections. A wiring part is provided at the free end of each second heating section;

[0015] Optionally, the silicon carbide heating element includes an outer ring part, a central part located inside the outer ring part, and a plurality of connecting parts connecting the central part and the outer ring part. The plurality of connecting parts are distributed at intervals along the circumferential direction of the central part or are cross-connected between the plurality of connecting parts. Ventilation gaps are formed at intervals between adjacent two connecting parts. The outer ring part and the central part are respectively provided with wiring parts; the central part is provided with a plurality of air flow holes, and the extending direction of the air flow holes is the same as the air flow direction in the second air duct;

[0016] Optionally, a plurality of air flow holes are provided on the silicon carbide heating element. The air flow holes are provided with through holes at both ends, and the extending direction of the air flow holes is the same as the air flow direction in the second air duct. Wiring parts are respectively provided on the outer side and the central area of the silicon carbide heating element;

[0017] Optionally, the silicon carbide heating element includes a plurality of heating sections connected in sequence. An included angle is provided between adjacent two heating sections, and ventilation gaps are formed at intervals between any two heating sections.

[0018] Optionally, the new hair dryer further includes a circuit assembly. Both the fan assembly and the silicon carbide heating element are electrically connected to the circuit assembly, and at least part of the circuit assembly is arranged in the second air duct.

[0019] Optionally, an air outlet is provided at one end of the air duct part. The air outlet is communicated with one end of the first air duct far away from the second air duct. An air inlet is provided at one end of the handheld part far away from the air duct part. The air inlet is communicated with the second air duct.

[0020] Optionally, the fan assembly is located between the circuit assembly and the silicon carbide heating element; or, the fan assembly is located on the side of the circuit assembly far away from the silicon carbide heating element.

[0021] The technical solution of the present invention uses 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 air flow flowing through the air duct. The silicon carbide heating element has a high thermal efficiency and can generate heat quickly, enabling rapid heating of the air flow. Compared with the traditional electric heating wire heating device, the silicon carbide heating element is an integral structure with a simple structure and a small size. It is also convenient to form various shapes, and can be preferably arranged at the corner between the first air duct and the second air duct, that is, it can make full use of the space at the corner of the first air duct and the second air duct, improving the space utilization rate inside the new hair dryer, which is beneficial to reducing the size of the new hair dryer or providing more possibilities for the installation of other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the new hair dryer of the present invention;

[0024] Figure 2 It is a schematic structural diagram of another embodiment of the new hair dryer of the present invention;

[0025] Figure 3 For Figure 2 It is a schematic structural diagram of the silicon carbide heating element in

[0026] Figure 4 For Figure 3 It is a cross-sectional view of the silicon carbide heating element in

[0027] Figure 5 It is a schematic structural diagram of another embodiment of the new hair dryer of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the air outlet fitting in an embodiment of the new hair dryer of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the air outlet fitting in another embodiment of the new hair dryer of the present invention

[0030] Figure 8 For Figure 5 It is a schematic structural diagram of the silicon carbide heating element in

[0031] Figure 9 For Figure 8 It is a schematic structural diagram of the silicon carbide heating element from another angle in

[0032] Figure 10 It is a schematic structural diagram of a silicon carbide heating element in another embodiment of the novel air duct of the present invention;

[0033] Figure 11 It is a schematic structural diagram of a silicon carbide heating element in another embodiment of the subject matter of the present invention;

[0034] Figure 12 It is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject matter of the present invention;

[0035] Figure 13 It is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject matter of the present invention;

[0036] Figure 14 It is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject matter of the present invention.

[0037] Explanation of the reference numerals in the drawings:

[0038] 11. Air duct part; 111. First air duct; 112. Air outlet; 12. Handheld part; 121. Second air duct; 122. 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 part; 35. Central part; 36. Connection part; 37. Wiring part; 38. Rib; 40. Circuit assembly; 50. Heat insulation component; 60. Air outlet fitting

[0039] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if descriptions such as "first" and "second" are involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present invention provides a new type of hair dryer.

[0044] In the embodiments of the present invention, as Figure 1 shown, the new type of hair dryer includes a housing, a fan assembly 20, and a heating device. The housing includes a handheld part 12 and an air duct part 11 provided at one end of the handheld part 12. The air duct part 11 is provided with a first air duct 111, and the handheld part 12 is provided with a second air duct 121 communicating with the first air duct 111. The first air duct 111 and the second air duct 121 are arranged at an angle, that is, the included angle between the flow direction of the air flow in the first air duct 111 and the flow direction of the air flow in the second air duct 121 is a convex angle (a convex angle is an angle greater than 0 degrees and less than 180 degrees);

[0045] The fan assembly 20 is installed in the housing to drive the air flow to flow through the second air duct 121 and the first air duct 111 in sequence;

[0046] The heating device includes a silicon carbide heating element 30. The silicon carbide heating element 30 is provided at the corner between the second air duct 121 and the first air duct 111. The surface of the silicon carbide heating element 30 forms a heat exchange surface to perform heat exchange with the air flow flowing from the second air duct 121 to the first air duct 111.

[0047] Specifically, the air duct part 11 is further provided with an air outlet 112. The air outlet 112 is located at one end of the air duct part 11 and communicates with the first air duct 111. The handheld part 12 is provided with an air inlet 122, and the air inlet 122 communicates with the second air duct 121. The new type of hair dryer further includes a circuit assembly 40. Both the fan assembly 20 and the heating device (silicon carbide heating element 30) are electrically connected to the circuit assembly 40. The circuit assembly 40 has circuit structures such as a controller and a power supply circuit, etc. The specific circuit structure can refer to the prior art, and the present invention will not elaborate on it one by one here. Optionally, the circuit assembly 40 is further provided with a power cord for the user to connect to an external power source; or the circuit assembly 40 is provided with a power interface for connecting the power cord.

[0048] The silicon carbide heating element 30 is an integral heating structure, that is, there are at least two spaced-apart wiring parts 37 on the silicon carbide heating element 30. The power supply circuit is connected through at least two wiring parts 37. After the power is turned on, the current flows through the silicon carbide heating element 30, thereby converting electrical energy into heat energy. When an air flow passes through the surface of the silicon carbide heating element 30, heat exchange can occur between the air flow and the silicon carbide heating element 30, so that the air flow passing through the silicon carbide heating element 30 can be heated. Compared with the heating wire, even if the new hair dryer is used for a long time, the silicon carbide heating element 30 will not break. 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 air flow, including the wall surface of the void 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 using silicon carbide powder as the main sintering phase raw material and mixing it with one or more conductive phase raw materials such as 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 according to a certain mass ratio, then water is used as a solvent and uniformly mixed by a ball mill, and then spray-dried. The dried powder and paraffin are heated and kneaded according to a certain mass ratio and poured into a hot die-casting machine to complete hot die-casting molding. After the green body is dried, it is put into a sintering furnace for sintering molding to obtain the silicon carbide heating element 30.

[0050] The technical solution of the present invention adopts the 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 air flow flowing through the air duct. The silicon carbide heating element 30 has a high thermal efficiency and can generate heat quickly, so that the air flow of the outlet can be heated quickly. Compared with the traditional heating wire heating device, the silicon carbide heating element 30 is an integral structure, with a simple structure and a small size. It is also convenient to form various shapes, and the silicon carbide heating element 30 can be preferably arranged at the corner between the first air duct 111 and the second air duct 121, that is, the space at the corner of the first air duct 111 and the second air duct 121 can be fully utilized, improving the space utilization rate in the new hair dryer, which is beneficial to reducing the size of the new hair dryer or providing more possibilities for the installation of other components.

[0051] In some embodiments, the fan assembly 20 is arranged in the second air duct 121, that is, when the fan assembly 20 drives the air flow into the second air duct 121, the air flow first passes through the fan assembly 20 and then through the silicon carbide heating element 30. In this way, it can be avoided that the hot air flow passes through the fan assembly 20, the fan assembly 20 can be prevented from overheating, and the fan assembly 20 can also be cooled. Of course, in other embodiments, the fan assembly 20 can also be arranged in the first air duct 111.

[0052] In some embodiments, the second air duct 121 penetrates through the inner wall of the first air duct 111 to communicate with the first air duct 111. Specifically, the inner wall of the first air duct 111 is a straight cylindrical wall, and the second air duct 121 penetrates through the inner wall of the first air duct 111 vertically or obliquely. This can simplify the structures of the first air duct 111 and the second air duct 121 and reduce the manufacturing difficulty. Among them, the silicon carbide heating element 30 can be bent, or multiple silicon carbide heating elements 30 can be provided.

[0053] In some other embodiments, referring to Figures 2 to 4 , the corner between the first air duct 111 and the second air duct 121 is an arc-shaped channel, that is, the first air duct 111 and the second air duct 121 are in an arc-shaped transition. In this way, the air flow can be guided well, which is beneficial to reducing the air flow loss and improving the air outlet effect.

[0054] In some embodiments, the silicon carbide heating element 30 is bent and is adaptively installed at the corner between the first air duct 111 and the second air duct 121. A bent flow channel is formed in the silicon carbide heating element 30. The bending radian of the silicon carbide heating element 30 is substantially the same as the bending radian of the corner between the first air duct 111 and the second air duct 121, and the radian of the bent flow channel formed in the silicon carbide heating element 30 is adapted to the bending radian of the silicon carbide heating element 30. In this way, the silicon carbide heating element 30 can be fully arranged at the corner between the first air duct 111 and the second air duct 121, that is, the size of the silicon carbide heating element 30 can be made larger, the surface area of the silicon carbide heating element 30 can be increased, thereby increasing the heat exchange area and improving the air flow heating effect.

[0055] In some other embodiments, referring to Figure 5 , the heating device includes multiple silicon carbide heating elements 30. The multiple silicon carbide heating elements 30 are arranged at the corner between the first air duct 111 and the second air duct 121 and are spaced apart along the direction from the second air duct 121 to the first air duct 111. In this way, by arranging multiple silicon carbide heating elements 30 in the air outlet section, while increasing the heat exchange area, the structure of each silicon carbide heating element 30 can be simplified, and the manufacturing difficulty and cost of the silicon carbide heating element 30 can be reduced.

[0056] In some embodiments, the new air duct further includes a heat insulation component 50. The heat insulation component 50 is correspondingly installed at the corner between the second air duct 121 and the first air duct 111 and surrounds the periphery of the silicon carbide heating element 30. In this way, the heat conduction of the silicon carbide heating element 30 to the outer surface of the new air duct can be reduced, and the heat loss can be reduced. Among them, the heat insulation component 50 is formed in a cylindrical shape and has a channel with both ends penetrating inside. The silicon carbide heating element 30 is arranged in the channel, and its material can be ABS plastic, PP plastic or heat insulation foam, etc.

[0057] Optionally, the silicon carbide heating element 30 is fixed within the heat insulation component 50, that is, the silicon carbide heating element 30 and the heat insulation component 50 can be assembled to form an integral module, facilitating subsequent assembly. When the silicon carbide heating element 30 is bent, the heat insulation component 50 is composed of two half-shells to form an arc-shaped cylinder, facilitating the installation of the bent silicon carbide heating element 30.

[0058] In some embodiments, the new hair dryer further includes a circuit assembly 40. Both the fan assembly 20 and the silicon carbide heating element 30 are electrically connected to the circuit assembly 40, and at least part of the circuit assembly 40 is disposed within the second air duct 121. That is, the main part of the circuit assembly 40 can be disposed within the second air duct 121. In this way, when the fan assembly 20 drives air flow into the second air duct 121, the air flow first passes through the circuit assembly 40 and then through the silicon carbide heating element 30. This can avoid hot air flow passing through the circuit assembly 40, prevent the circuit assembly 40 from overheating, and also dissipate heat from the circuit assembly 40.

[0059] In some embodiments, one end of the air duct portion 11 is provided with an air outlet 112, and the air outlet 112 communicates with one end of the first air duct 111 away from the second air duct 121. One end of the hand-held portion 12 away from the air duct portion 11 is provided with an air inlet 122, and the air inlet 122 communicates with the second air duct 121. With such a setting, it is convenient for the user to direct the air outlet 112 towards himself during use, and it can also prevent the user from blocking the air inlet 122 when holding the hand-held portion 12.

[0060] Optionally, at least one of the end face and the circumferential side of the hand-held portion 12 is provided with an air inlet 122. That is, the air inlet 122 can be disposed on the circumferential side of the hand-held portion 12, or the air inlet 122 can be disposed on the end face of the hand-held portion 12, or the air inlet 122 can be provided on both the circumferential side and the end face of the hand-held portion 12.

[0061] The fan assembly 20 is located between the circuit assembly 40 and the silicon carbide heating element 30; or, the fan assembly 20 is located on a side of the circuit assembly 40 away from the silicon carbide heating element 30.

[0062] In some embodiments, the end portion of the air outlet section provided with the air outlet 112 is further provided with a fitting connection structure. That is, during use, the required air outlet fitting 60 (such as a nozzle) can be installed on the fitting connection structure so that the channel of the air outlet fitting 60 communicates with the air outlet 112. That is, the air flow blown out from the air outlet 112 can enter the channel of the air outlet fitting 60 and then be blown out from the air flow outlet of the air outlet fitting 60. In this way, different air outlet forms can be achieved through different air outlet fittings 60. It can also be used without installing the air outlet fitting 60, that is, the air flow directly blown out from the air outlet 112 can be used to dry water stains on the table, clothes or hair, etc.

[0063] In some embodiments, the new hair dryer further includes an air outlet accessory 60, and the air outlet accessory 60 is detachably connected to the accessory connection structure. In this way, users can rotate and install the air outlet accessory 60 for use according to needs, increasing the application scenarios of the new hair dryer.

[0064] Among them, the form of the air outlet accessory 60 can be various. For example, in some embodiments, referring to Figure 6 , the air outlet accessory 60 is a nozzle, such as a diffuser nozzle, a concentrator nozzle, or an anti-flyaway nozzle, etc. In some other embodiments, referring to Figure 7 , the air outlet accessory 60 is a comb. A plurality of comb teeth and a plurality of air flow outlets are provided on the periphery of the comb, and the air flow outlets are located between the comb teeth. Among them, the comb teeth and the air flow outlets can be provided on only one side or opposite sides of the peripheral surface of the comb, or the comb teeth and the air flow outlets can be provided on the entire outer peripheral surface of the comb.

[0065] The specific structure of the silicon carbide heating element 30 can be various. For example, referring to Figure 8 and Figure 9 , in some embodiments, the silicon carbide heating element 30 includes a spiral main body and at least two wiring parts 37. Wiring parts 37 are provided at both ends of the spiral main body, and ventilation gaps 301 are formed at intervals between adjacent spiral segments of the spiral main body. With such a setting, in the same volume, the surface area of the silicon carbide heating element 30 can be made larger, the contact area with the air flow can be increased, and thus the heat exchange efficiency can be improved. Among them, the silicon carbide heating element 30 can be a planar spiral structure or a tower-shaped spiral structure.

[0066] 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 spirally extend outward from the first heating section 31, and ventilation gaps 301 are formed at intervals between the two second heating sections 32. A wiring part 37 is provided at the free end of each second heating section 32. That is, the two second heating sections 32 spirally extend outward 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 parts 37 of the silicon carbide heating element 30 are both located at the outside position. While realizing the use of the spiral structure to increase the heat exchange area, it is also convenient for wiring.

[0067] In some other embodiments, referring to Figure 10 , the silicon carbide heating element 30 includes a plurality of heating sections 33 connected in sequence. An included angle is provided between adjacent two heating sections 33, and ventilation gaps 301 are formed at intervals between any two heating sections 33. That is, the plurality of heating sections 33 form a bent structure according to a certain rule, so that the heat exchange area of the silicon carbide heating element 30 can be increased.

[0068] In still some other embodiments, referring to Figure 11, a plurality of air flow holes 302 are provided on the silicon carbide heating element 30. The air flow holes 302 penetrate through both ends, and the extending direction of the air flow holes 302 is the same as the air flow direction in the second air duct 121. Wiring parts 37 are respectively provided on the outer side and the central area of the silicon carbide heating element 30.

[0069] In some other embodiments, referring to Figure 12 , the silicon carbide heating element 30 includes an outer ring part 34, a central part 35 located inside the outer ring part 34, and a plurality of connecting parts 36 connecting the central part 35 and the outer ring part 34. Ventilation gaps 301 are formed at intervals between two adjacent connecting parts 36. Wiring parts 37 are respectively provided on the outer ring part 34 and the central part 35. Optionally, the plurality of connecting parts 36 are circumferentially spaced apart along the central part 35 (refer to Figure 12 ); or the plurality of connecting parts 36 are cross-connected (refer to Figure 13 or Figure 14 ).

[0070] Optionally, a plurality of air flow through holes are provided in the central part 35, and the extending direction of the air flow through holes is the same as the air flow direction in the second air duct 121. In this way, the heat exchange area of the silicon carbide heating element 30 can also be made larger, and the heat exchange efficiency can be improved.

[0071] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A new type of air duct, characterized in that: include: The housing comprises a handheld portion and an air duct portion provided at one end of the handheld portion, the air duct portion is provided with a first air duct, the handheld portion is provided with a second air duct connected to the first air duct, and the first air duct and the second air duct are provided at an angle; a fan assembly, disposed in the second air duct, for driving airflow to flow through the second air duct and the first air duct in sequence; as well as A heating device, comprising a silicon carbide heating element, wherein the silicon carbide heating element is arranged at a corner between the second air duct and the first air duct, and a surface of the silicon carbide heating element forms a heat exchange surface for heat exchange with an airflow flowing from the second air duct to the first air duct; The silicon carbide heating element comprises an outer ring portion, a central portion located inside 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 wiring portions; a power supply circuit is connected through at least two of the wiring portions, and when the power supply is turned on, current flows through the silicon carbide heating element; The heating device comprises a plurality of silicon carbide heating elements, which are arranged at a corner between the first air duct and the second air duct and are arranged at intervals in a direction from the second air duct to the first air duct; The novel air duct further comprises a heat insulating component, which is installed at the corner between the second air duct and the first air duct and surrounds the circumference of the silicon carbide heating element; The silicon carbide heating element is fixed in the heat insulating component so that the silicon carbide heating element and the heat insulating component are assembled to form an integral module.

2. The novel hair dryer as claimed in claim 1, characterized in that: The corner between the first air duct and the second air duct is an arc-shaped channel.

3. The novel hair dryer as claimed in claim 2, characterized in that: The silicon carbide heating element is bent and adapted to be installed at a corner between the first air duct and the second air duct. A bent flow channel is formed in the silicon carbide heating element.

4. The novel hair dryer as claimed in claim 1, characterized in that: The second air duct passes through the inner wall of the first air duct to communicate with the first air duct.

5. The novel hair dryer as claimed in claim 1, characterized in that: The central portion is provided with a plurality of air flow holes, and the extension direction of the air flow holes is consistent with the flow direction of the air flow in the second air duct.

6. The novel hair dryer as claimed in claim 1, characterized in that: The novel air duct further comprises a circuit assembly, the fan assembly and the silicon carbide heating element are both electrically connected to the circuit assembly, and the circuit assembly is at least partially disposed in the second air duct.

7. The novel hair dryer as claimed in claim 6, characterized in that: An air outlet is provided at one end of the air duct portion, and the air outlet is connected to an end of the first air duct away from the second air duct. An air inlet is provided at one end of the hand-held portion away from the air duct portion, and the air inlet is connected to the second air duct.

8. The novel hair dryer as claimed in claim 7, characterized in that: The fan assembly is located between the circuit assembly and the silicon carbide heating element; or, the fan assembly is located on a side of the circuit assembly away from the silicon carbide heating element.

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