High-speed air duct

Abstract

The high-speed air duct comprises a shell, a circuit assembly, a fan assembly and a heating device, the shell comprises an air duct part and a handheld part connected to the side face of the air duct part, an air inlet is formed in one end of the air duct part, an air outlet is formed in the other end of the air duct part, and an air outlet duct communicated with the air outlet and the air inlet is arranged in the air duct part; the circuit assembly is arranged in the handheld part and is provided with a first circuit board extending into the air outlet duct; the fan assembly is arranged in the air outlet duct, and the fan assembly is electrically connected with the first circuit board; the heating device comprises a silicon carbide heating body, the silicon carbide heating body is arranged in the air outlet channel and electrically connected with the first circuit board, the first circuit board is located between the silicon carbide heating body and the fan assembly, and a heat exchange face is formed on the surface of the silicon carbide heating body so as to exchange heat with airflow flowing through the second air channel. According to the technical scheme, the structure of the heating device can be simplified, the space utilization rate in the high-speed air duct is improved, and the size of the handle is reduced.

Description

Technical Field

[0001] The utility model relates to the field of hair drying devices, in particular to a high-speed 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. It is generally arranged at the inner side of the air outlet, and the circuit board is generally arranged in the handle, which usually leads to a large handle size and is not convenient for users to hold and use. Utility Model Content

[0003] The main purpose of the utility model is to provide a high-speed air duct, aiming to simplify the structure of the heating device, improve the space utilization rate in the high-speed air duct, and reduce the size of the handle.

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

[0005] The housing comprises an air channel portion and a hand-held portion connected to the side of the air channel portion, wherein one end of the air channel portion is provided with an air inlet, and the other end is provided with an air outlet, and the air channel portion is provided with an air outlet duct connecting the air outlet and the air inlet;

[0006] A circuit assembly is disposed in the handheld portion and has a first circuit board extending into the air outlet duct;

[0007] a fan assembly, disposed in the air outlet duct, the fan assembly being electrically connected to the first circuit board; and

[0008] The heating device includes a silicon carbide heating element, which is arranged in the air outlet duct and electrically connected to the first circuit board. The first circuit board is located between the silicon carbide heating element and the fan assembly. The surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow flowing through the air outlet duct.

[0009] Optionally, a cylinder is provided in the air duct portion, the air outlet duct is formed in the cylinder, a through hole is provided on the side wall of the cylinder, the first circuit board passes through the through hole and extends into the air outlet duct, and a sealing structure is provided between the through hole and the first circuit board.

[0010] Optionally, the first circuit board is located on the axis of the air outlet duct, and the first circuit board is parallel to the axis of the air outlet duct.

[0011] Optionally, a fixing groove is further provided in the cylinder, the fixing groove is opposite to the through hole, and the end of the first circuit board is inserted into the fixing groove.

[0012] Optionally, the circuit assembly further includes a second circuit board, the second circuit board is electrically connected to the first circuit board, and the second circuit board is in the shape of a long strip extending along the length direction of the handheld part.

[0013] Optionally, the circuit assembly further includes a third circuit board, the third circuit board is electrically connected to the second circuit board, and the third circuit board is in the shape of a long strip extending along the length direction of the handheld part and is perpendicular to the second circuit board.

[0014] Optionally, the circuit assembly further includes a button assembly and a plurality of indicator lights, and the button assembly and the plurality of indicator lights are arranged along the length direction of the handheld portion.

[0015] Optionally, the silicon carbide heating element as a whole is a columnar structure extending along the length direction of the air outlet duct.

[0016] 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;

[0017] 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;

[0018] 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;

[0019] 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;

[0020] 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.

[0021] Optionally, the silicon carbide heating element is disposed between the air outlet and the first circuit board;

[0022] Optionally, the high-speed air duct further includes a heat insulation component, which is disposed in the air duct portion and surrounds the circumference of the silicon carbide heating element.

[0023] 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. Therefore, the first circuit board can be partially extended into the outlet air duct of the air duct part, and the space in the air duct part can be used to install the first circuit board, thereby improving the space utilization rate in the high-speed air duct. In this way, the size of the first circuit board in the handheld part can be reduced, thereby reducing the size of the handheld part, so that it is convenient for users to hold and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 This is a structural schematic diagram of an embodiment of the utility model high-speed air duct;

[0026] Figure 2 for Figure 1 Cross-sectional view of a medium- and high-speed air duct;

[0027] Figure 3 for Figure 2 A schematic diagram of the structure of the middle cylinder and the first circuit board;

[0028] Figure 4 for Figure 1 Schematic diagram of the structure of the silicon carbide heating element;

[0029] Figure 5 for Figure 4 A schematic diagram of the structure of the silicon carbide heating element from another angle;

[0030] Figure 6 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the high-speed air duct of the utility model;

[0031] Figure 7 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the subject of the utility model;

[0032] Figure 8 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0033] Fig. 9 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.10 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model.

[0035] Description of Figure Numbers:

[0036] 11. Air duct; 111. Air outlet duct; 112. Air outlet; 113. Air inlet; 12. Handheld 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; 43. Third circuit board; 44. Button assembly; 45. Indicator light; 50. Heat insulation component; 60. Cylinder; 61. Via hole; 62. Sealing structure; 63. Fixing groove

[0037] 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

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The utility model provides a high-speed air duct.

[0042] In the embodiment of the present utility model, Figures 1 to 5 As shown, the high-speed air duct includes a shell, a circuit component 40, a fan component 20 and a heating device. The shell includes an air duct portion 11 and a hand-held portion 12 connected to the side of the air duct portion 11. An air inlet 113 is provided at one end of the air duct portion 11, and an air outlet 112 is provided at the other end. An air outlet duct 111 connecting the air outlet 112 and the air inlet 113 is provided in the air duct portion 11.

[0043] The circuit assembly 40 is disposed in the handheld portion 12 and has a first circuit board 41 extending into the air outlet duct 111 ; the fan assembly 20 is disposed in the air outlet duct 111 , and the fan assembly 20 is electrically connected to the first circuit board 41 .

[0044] The heating device includes a silicon carbide heating element 30, which is disposed in the air outlet duct 111 and electrically connected to a first circuit board 41. The first circuit board 41 is located between the silicon carbide heating element 30 and the fan assembly 20. The surface of the silicon carbide heating element 30 forms a heat exchange surface to exchange heat with the airflow flowing through the air outlet duct 111.

[0045] Specifically, the circuit assembly 40 has a circuit structure such as a controller, a power supply circuit, etc. The specific circuit structure can refer to the prior art, and the present invention 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.

[0046] Optionally, at least one of the end surface and the peripheral side of the air duct portion 11 is provided with an air inlet 113. That is, the air inlet 113 can be provided on the peripheral side of the air duct portion 11, the air inlet 113 can also be provided on the end surface of the air duct portion 11, or the air inlet 113 can also be provided on both the peripheral side and the end surface of the air duct portion 11.

[0047] 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 a high-speed air duct is used for a long time, the silicon carbide heating element 30 will not be disconnected. The surface of the silicon carbide heating element 30 refers to the surface of the silicon carbide heating element 30 that is exposed to the air and can contact the airflow, including the wall surface of the gap formed by the silicon carbide heating element 30 and the inner wall surface of the through hole.

[0048] 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.

[0049] 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. Therefore, the first circuit board 41 can be partially extended into the air outlet duct 111 of the air duct part 11, and the space in the air duct part 11 can be used to install the first circuit board 41, which improves the space utilization rate in the high-speed air duct, so that the size of the first circuit board 41 in the handheld part 12 can be reduced, thereby reducing the size of the handheld part 12 for easy holding and use by the user.

[0050] In some embodiments, a cylinder 60 is provided in the air channel portion 11, an air outlet duct 111 is formed in the cylinder 60, a through hole 61 is provided on the side wall of the cylinder 60, the first circuit board 41 passes through the through hole 61 and extends into the air outlet duct 111, and a sealing structure 62 is provided between the through hole 61 and the first circuit board 41. In this way, the cylinder 60 can be used to separate the air outlet duct 111 from the inner cavity of the handheld portion 12 to prevent air flow into the handheld portion 12. By providing a sealing structure 62 between the through hole 61 and the first circuit board 41, air leakage between the through hole 61 and the first circuit board 41 can be prevented. Optionally, the sealing structure 62 is a silicone sealing ring or a sealing foam.

[0051] In some embodiments, the first circuit board 41 is located on the axis of the air outlet duct 111, and the first circuit board 41 is parallel to the axis of the air outlet duct 111. In this way, the first circuit board 41 can reduce the obstruction of the air flow in the air outlet duct 111 and reduce the air flow loss. Of course, in other embodiments, the first circuit board 41 can also be attached to the inner wall surface of the air outlet duct 111.

[0052] In some embodiments, a fixing groove 63 is further provided in the cylinder 60, the fixing groove 63 is opposite to the through hole 61, and the end of the first circuit board 41 is inserted into the fixing groove 63. In this way, the first circuit board 41 can be better fixed, and the first circuit board 41 is prevented from shaking under the action of high-speed airflow, thereby improving the installation stability and reliability of the first circuit board 41.

[0053] In some embodiments, the circuit assembly 40 further includes a second circuit board 42, which is electrically connected to the first circuit board 41, and the second circuit board 42 is in the shape of a long strip extending along the length direction of the handheld portion 12. In this way, the space occupied by the second circuit board 42 in the radial direction of the handheld portion 12 can be reduced, and the diameter of the handheld portion 12 can be reduced.

[0054] Furthermore, the circuit assembly 40 further includes a third circuit board 43, which is electrically connected to the second circuit board 42, and is in the shape of a strip extending along the length direction of the handheld portion 12, and is perpendicular to the second circuit board 42. In this way, the widths of the first circuit board 41 and the second circuit board 42 can be reduced, so that the second circuit board 42 and the third circuit board 43 are fully arranged in the space inside the handheld portion 12, and the diameter of the handheld portion 12 can be reduced. Of course, in other embodiments, only the first circuit board 41 may be provided.

[0055] In some embodiments, the circuit assembly 40 further includes a key assembly 44 and a plurality of indicator lights 45, and the key assembly 44 and the plurality of indicator lights 45 are arranged along the length direction of the handheld portion 12. Arranging the key assembly 44 and the plurality of indicator lights 45 along the length direction of the handheld portion 12 in this way can make full use of the space in the length direction of the handheld portion 12, which is conducive to reducing the diameter of the handheld portion 12.

[0056] In some embodiments, the silicon carbide heating element 30 is disposed between the air outlet 112 and the first circuit board 41. This can prevent the hot air flow from passing through the first circuit board 41 and the fan assembly 20, prevent the first circuit board 41 and the fan assembly 20 from overheating, and can also better dissipate heat for the first circuit board 41 and the fan assembly 20. When designing the circuit, the electronic components with a larger heat generation can be arranged in the part of the first circuit board 41 located in the air outlet duct 111, so as to utilize the outlet air flow for heat dissipation.

[0057] In some embodiments, the high-speed air duct also includes a heat-insulating component 50, which is disposed in the air duct portion 11 and surrounds the circumference of the silicon carbide heating element 30. This can reduce the heat conduction of the silicon carbide heating element 30 to the outer surface of the air duct portion 11, and can reduce heat loss. The heat-insulating component 50 is formed in a cylindrical shape, and a channel with two ends passing through is formed inside. The silicon carbide heating element 30 is disposed in the channel, and its material can be ABS plastic, PP plastic or heat-insulating foam, etc.

[0058] 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.

[0059] The specific structure of the silicon carbide heating element 30 can be various, for example, Figure 4 and Figure 5 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.

[0060] 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.

[0061] In some other embodiments, reference Figure 6 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.

[0062] In some other embodiments, reference Figure 7 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.

[0063] In some other embodiments, reference Figure 8 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 Figure 8 ); or multiple connecting portions 36 are staggeredly connected (reference Fig. 9 or Fig.10 ).

[0064] Optionally, the central portion 35 is provided with a plurality of airflow holes 61, and the extension direction of the airflow holes 61 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.

[0065] In some embodiments, the silicon carbide heating element 30 is a columnar structure extending along the length direction of the air duct. That is, the silicon carbide heating element 30 has a certain height. Such a configuration can increase the length of the ventilation gap 301 / airflow hole 302 in the silicon carbide heating element 30, that is, the surface area of ​​the silicon carbide heating element 30 can be increased, the heat exchange area of ​​the silicon carbide heating element 30 is increased, and the heat exchange efficiency is improved.

[0066] 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 high-speed air duct, characterized in that: include: The housing comprises an air channel portion and a hand-held portion connected to the side of the air channel portion, wherein one end of the air channel portion is provided with an air inlet, and the other end is provided with an air outlet, and the air channel portion is provided with an air outlet duct connecting the air outlet and the air inlet; A circuit assembly is disposed in the handheld portion and has a first circuit board extending into the air outlet duct; A fan assembly is disposed in the air outlet duct, and the fan assembly is electrically connected to the first circuit board; as well as The heating device includes a silicon carbide heating element, which is arranged in the air outlet duct and electrically connected to the first circuit board. The first circuit board is located between the silicon carbide heating element and the fan assembly. The surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow flowing through the air outlet duct.

2. The high-speed air duct according to claim 1, characterized in that: A cylinder is provided in the air duct portion, the air outlet duct is formed in the cylinder, a through hole is provided on the side wall of the cylinder, the first circuit board passes through the through hole and extends into the air outlet duct, and a sealing structure is provided between the through hole and the first circuit board.

3. The high-speed air duct according to claim 2, characterized in that: The first circuit board is located on the axis of the air outlet duct, and the first circuit board is parallel to the axis of the air outlet duct.

4. The high-speed air duct according to claim 3, characterized in that: The cylinder is further provided with a fixing groove, the fixing groove is opposite to the through hole, and the end of the first circuit board is inserted into the fixing groove.

5. The high-speed air duct according to claim 1, characterized in that: The circuit assembly further includes a second circuit board, which is electrically connected to the first circuit board, and the second circuit board is in the shape of a long strip extending along the length direction of the handheld part.

6. The high-speed air duct according to claim 5, characterized in that: The circuit assembly also includes a third circuit board, which is electrically connected to the second circuit board. The third circuit board is in the shape of a long strip extending along the length direction of the handheld part and is perpendicular to the second circuit board.

7. The high-speed air duct according to claim 6, characterized in that: The circuit assembly further comprises a button assembly and a plurality of indicator lights, and the button assembly and the plurality of indicator lights are arranged along the length direction of the handheld portion.

8. The high-speed air duct according to claim 1, 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 high-speed air duct 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.

10. The high-speed air duct according to claim 1, characterized in that: The silicon carbide heating element is arranged between the air outlet and the first circuit board; and / or the high-speed air duct also includes a heat insulation component, the heat insulation component is arranged in the air duct part, and the heat insulation component surrounds the circumference of the silicon carbide heating element.

Images