Novel air duct

Abstract

The novel air duct comprises a shell, a fan assembly and a heating device, the shell comprises a handheld part and an air duct part arranged at one end of the handheld part, the air duct part is provided with a first air duct, the handheld part is provided with a second air duct communicated with the first air duct, and an included angle is formed between the first air duct and the second air duct; the fan assembly is installed in the shell and used for driving airflow to sequentially flow through the second air channel and the first air channel. The heating device comprises a silicon carbide heating body, the silicon carbide heating body is arranged at the corner between the second air channel and the first air channel, and a heat exchange face is formed on the surface of the silicon carbide heating body so as to exchange heat with airflow flowing to the first air channel through the second air channel. According to the technical scheme, the structure of the heating device can be simplified, and the space utilization rate in the novel air duct is improved.

Description

Technical Field

[0001] The utility model relates to the field of hair drying devices, in particular to a novel 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, and the location where it can be installed is limited, making it difficult to fully utilize the internal space of the hair dryer. Utility Model Content

[0003] The main purpose of the utility model is to provide a new type of air duct, aiming to simplify the structure of the heating device and improve the space utilization rate in the new type of air duct.

[0004] In order to achieve the above-mentioned purpose, the novel air duct proposed by the utility model comprises:

[0005] The housing comprises a handheld portion and an air duct portion provided at one end of the handheld portion, 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;

[0006] a fan assembly, installed in the housing, for driving airflow to flow through the second air duct and the first air duct in sequence; and

[0007] 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, and the surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow 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 curved and adapted to be installed at a corner between the first air duct and the second air duct, and a curved flow channel is formed in the silicon carbide heating element.

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

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

[0012] Optionally, the novel air duct further includes a heat insulating component, which is correspondingly installed at a corner between the second air duct and the first air duct and surrounds the circumference of the silicon carbide heating element.

[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 flow direction of the airflow in the second air duct;

[0016] 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 second air 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 fan assembly is disposed in the first air duct; or, the fan assembly is disposed in the second air duct.

[0019] Optionally, the novel air duct further includes 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.

[0020] Optionally, 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 an end of the handheld portion away from the air duct portion, and the air inlet is connected to the second air duct.

[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. It can also be easily formed into a variety of shapes. The silicon carbide heating element can be well set at the corner between the first air duct and the second air duct, that is, the space at the corner of the first air duct and the second air duct can be fully utilized, which improves the space utilization rate in the new air duct, which is conducive to reducing the size of the new air duct or providing more possibilities for the installation of other components. 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 structural schematic diagram of an embodiment of the new type of hair dryer of the utility model;

[0024] Figure 2 This is a schematic structural diagram of another embodiment of the new type of air duct of the utility model;

[0025] Figure 3 for Figure 2 Schematic diagram of the structure of the silicon carbide heating element;

[0026] Figure 4 for Figure 3 A cross-sectional view of a silicon carbide heating element;

[0027] Figure 5 This is a structural schematic diagram of another embodiment of the new type of air duct of the utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the air outlet accessories in one embodiment of the new type of air duct of the utility model;

[0029] Figure 7 This is a structural diagram of the air outlet accessories in another embodiment of the utility model.

[0030] Figure 8 for Figure 5 Schematic diagram of the structure of the silicon carbide heating element;

[0031] Fig. 9 for Figure 8 A schematic diagram of the structure of the silicon carbide heating element from another angle;

[0032] Fig.10 This is a schematic diagram of the structure of a silicon carbide heating element in another embodiment of the new type of air duct of the utility model;

[0033] Fig.11 This is a schematic structural diagram of a silicon carbide heating element in 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 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] Description of Figure Numbers:

[0038] 11. Air duct; 111. First air duct; 112. Air outlet; 12. Hand-held 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; 35. Center; 36. Connecting part; 37. Wiring part; 38. Rib; 40. Circuit assembly; 50. Heat insulation component; 60. Air outlet accessories

[0039] 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

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The utility model provides a novel air duct.

[0044] In the embodiment of the present utility model, Figure 1 As shown, the novel air duct comprises a shell, a fan assembly 20 and a heating device, the shell comprises a handheld portion 12 and an air duct portion 11 arranged at one end of the handheld portion 12, the air duct portion 11 is provided with a first air duct 111, the handheld portion 12 is provided with a second air duct 121 connected to the first air duct 111, the first air duct 111 and the second air duct 121 are arranged at an angle, that is, the angle between the flow direction of the airflow in the first air duct 111 and the flow direction of the airflow 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 airflow 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, which is arranged at the corner between the second air duct 121 and 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 airflow flowing from the second air duct 121 to the first air duct 111.

[0047] Specifically, the air duct portion 11 is also provided with an air outlet 112, and the air outlet 112 is located at one end of the air duct portion 11 and is connected to the first air duct 111. The handheld portion 12 is provided with an air inlet 122, and the air inlet 122 is connected to the second air duct 121. The new hair dryer also includes a circuit assembly 40, and the fan assembly 20 and the heating device (silicon carbide heating element 30) are both electrically connected to the circuit assembly 40. 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 present utility model will not elaborate on this 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 new type of air duct 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 formed by the silicon carbide heating element 30 and the inner wall 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. It can also be easily formed into a variety of shapes. The silicon carbide heating element 30 can be well set 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, thereby improving the space utilization rate in the new air duct, which is conducive to reducing the size of the new air duct or providing more possibilities for the installation of other components.

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

[0052] In some embodiments, the second air duct 121 penetrates 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 cylinder wall, and the second air duct 121 vertically or obliquely penetrates the inner wall of the first air duct 111. In this way, the structure of the first air duct 111 and the second air duct 121 can be simplified, and the manufacturing difficulty can be reduced. Among them, the silicon carbide heating element 30 can be arranged in a curved manner, and multiple silicon carbide heating elements 30 can also be arranged.

[0053] In other embodiments, reference 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, which can better guide the airflow, help reduce airflow loss, and improve the air outlet effect.

[0054] In some embodiments, the silicon carbide heating element 30 is curved and adapted to be installed at the corner between the first air duct 111 and the second air duct 121, and a curved flow channel is formed in the silicon carbide heating element 30. The curvature of the silicon carbide heating element 30 is substantially the same as the curvature of the corner between the first air duct 111 and the second air duct 121, and the curvature of the curved flow channel formed in the silicon carbide heating element 30 is adapted to the curvature of the silicon carbide heating element 30, so that 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, and the surface area of ​​the silicon carbide heating element 30 can be increased, thereby increasing the heat exchange area and improving the airflow heating effect.

[0055] In other embodiments, reference Figure 5 The heating device includes a plurality of silicon carbide heating elements 30, which are arranged at the corner between the first air duct 111 and the second air duct 121, and are arranged at intervals along the direction from the second air duct 121 to the first air duct 111. By arranging a plurality of silicon carbide heating elements 30 in the air outlet section, the heat exchange area can be increased while simplifying the structure of each silicon carbide heating element 30, thereby reducing the manufacturing difficulty and cost of the silicon carbide heating element 30.

[0056] In some embodiments, the novel air duct further includes a heat insulating component 50, which is correspondingly installed at the corner between the second air duct 121 and the first air duct 111, 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 novel air duct, and can reduce heat loss. Among them, the heat insulating component 50 is formed in a cylindrical shape, and a channel with two ends through is formed inside. The silicon carbide heating element 30 is arranged in the channel, and its material can be ABS plastic, PP plastic or heat-insulating foam, etc.

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

[0058] In some embodiments, the novel air duct further includes a circuit assembly 40, the fan assembly 20 and the silicon carbide heating element 30 are electrically connected to the circuit assembly 40, and the circuit assembly 40 is at least partially disposed in the second air duct 121. That is, the main part of the circuit assembly 40 can be disposed in the second air duct 121, so that when the fan assembly 20 drives the airflow into the second air duct 121, the airflow first passes through the circuit assembly 40, and then passes through the silicon carbide heating element 30, so that the hot air flow can be prevented from passing through the circuit assembly 40, the circuit assembly 40 can be prevented from overheating, and the circuit assembly 40 can also be cooled.

[0059] In some embodiments, an air outlet 112 is provided at one end of the air channel portion 11, and the air outlet 112 is communicated with an end of the first air channel 111 away from the second air channel 121, and an air inlet 122 is provided at an end of the handheld portion 12 away from the air channel portion 11, and the air inlet 122 is communicated with the second air channel 121. This arrangement facilitates the user to direct the air outlet 112 toward himself when in use, and can also prevent the user from blocking the air inlet 122 when holding the handheld portion 12.

[0060] Optionally, at least one of the end surface and the peripheral side of the handheld portion 12 is provided with an air inlet 122. That is, the air inlet 122 can be provided on the peripheral side of the handheld portion 12, the air inlet 122 can be provided on the end surface of the handheld portion 12, or the air inlet 122 can be provided on both the peripheral side and the end surface of the handheld portion 12.

[0061] In some embodiments, the end of the air outlet section provided with the air outlet 112 is also provided with an accessory connection structure, that is, when in use, the required air outlet accessory 60 (such as a nozzle) can be installed on the accessory connection structure, so that the channel of the air outlet accessory 60 is connected with the air outlet 112, that is, the airflow blown out from the air outlet 112 can enter the channel of the air outlet accessory 60, and then blown out from the airflow outlet of the air outlet accessory 60, so that different air outlet forms can be achieved through different air outlet accessories 60. It can also be used without installing the air outlet accessory 60, that is, the airflow directly blown out from the air outlet 112 can be used to dry water stains on the desktop, clothes or hair, etc.

[0062] In some embodiments, the new hair dryer further comprises an air outlet accessory 60, and the air outlet accessory 60 is detachably connected to the accessory connection structure, so that the user can rotate and install the air outlet accessory 60 for use as needed, thereby increasing the application scenarios of the new hair dryer.

[0063] The air outlet accessory 60 may have various forms. For example, in some embodiments, Figure 6 , the air outlet accessory 60 is an air nozzle, such as a diffuser air nozzle, a wind collection nozzle or an anti-flying air nozzle, etc. In other embodiments, refer to Figure 7The air outlet accessory 60 is a comb head, and a plurality of comb teeth and a plurality of air outlets are arranged around the comb head, and the air outlets are located between the comb teeth. The comb teeth and the air outlets may be arranged only on one side or two opposite sides of the comb head, or on the outer circumference of the comb head.

[0064] The specific structure of the silicon carbide heating element 30 can be various, for example, Figure 8 and Fig. 9 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.

[0065] 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.

[0066] In some other embodiments, reference Fig.10 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.

[0067] In some other embodiments, reference Fig.11 The silicon carbide heating element 30 is provided with a plurality of air flow holes 302, and the air flow holes 302 are through-through at both ends. The extension direction of the air flow holes 302 is consistent with the flow direction of the air flow in the second air duct 121, and the outer side and the central area of ​​the silicon carbide heating element 30 are respectively provided with connection parts 37.

[0068] In some other embodiments, reference Fig.12The 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.12 ); or multiple connecting portions 36 are staggeredly connected (reference Fig.13 or Fig.14 ).

[0069] Optionally, the central portion 35 is provided with a plurality of airflow holes, and the extension direction of the airflow holes is consistent with the airflow direction in the second air duct 121. This can also make the heat exchange area of ​​the silicon carbide heating element 30 larger, and can improve the heat exchange efficiency.

[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 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, installed in the housing, for driving airflow to flow through the second air duct and the first air duct in sequence; as well as 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, and the surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow flowing from the second air duct to the first air duct.

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 2, characterized in that: The heating device includes a plurality of silicon carbide heating elements, which are disposed at a corner between the first air duct and the second air duct and are arranged at intervals along a direction from the second air duct to the first air duct.

5. 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.

6. The novel hair dryer according to any one of claims 1 to 5, characterized in that: The novel air duct also includes 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.

7. The novel hair dryer as claimed in 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 second 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 second 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.

8. The novel hair dryer as claimed in claim 1, characterized in that: The fan assembly is disposed in the first air duct; or, the fan assembly is disposed in the second air duct.

9. 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.

10. The novel hair dryer as claimed in claim 9, 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.

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