Handheld hair dryer

Abstract

The utility model discloses a handheld hair dryer, comprising a shell, a fan assembly and a heating device, wherein the shell comprises a handheld portion and an air duct portion arranged at one end of the handheld portion, wherein the air duct portion is provided with a first air duct, and the handheld portion is provided with a second air duct connected to the first air duct; the fan assembly is installed in the shell to drive airflow to flow through the second air duct and the first air duct in sequence; the heating device comprises a silicon carbide heating element, wherein the silicon carbide heating element is arranged in the second air duct, and the surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow flowing through the second air duct. The technical solution of the utility model can simplify the structure of the heating device and improve the space utilization rate in the handheld hair dryer.

Description

Technical Field

[0001] The utility model relates to the field of hair drying devices, in particular to a handheld 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. The installation space in the hair dryer is limited, and a larger housing is usually required for installation, resulting in a larger size of the hair dryer. Utility Model Content

[0003] The main purpose of the utility model is to provide a handheld hair dryer, aiming to simplify the structure of the heating device and improve the space utilization rate in the handheld hair dryer.

[0004] To achieve the above object, the handheld hair dryer 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, and the handheld portion is provided with a second air duct connected to the first air duct;

[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 in the second air duct. The silicon carbide heating element is provided with at least two spaced-apart wiring parts, and the surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow flowing through the second air duct.

[0008] Optionally, the silicon carbide heating element is located in the second air duct at one end close to the first air duct.

[0009] Optionally, the handheld portion is provided with an air inlet connected to the second air duct, and the fan assembly is arranged in the second air duct and between the silicon carbide heating element and the air inlet.

[0010] Optionally, the silicon carbide heating element as a whole is a columnar structure extending along the length direction of the second air duct.

[0011] Optionally, the silicon carbide heating element comprises a spiral body and at least two of the connection parts, both ends of the spiral body are provided with the connection parts, and a ventilation gap is formed between two adjacent spiral segments of the spiral body;

[0012] 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 the free end of each second heating segment is provided with the wiring portion;

[0013] 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 the 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;

[0014] 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 the wiring parts;

[0015] 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.

[0016] Optionally, the handheld hair dryer further comprises a heat insulating component, wherein the heat insulating component is disposed in the handheld portion and surrounds the circumference of the silicon carbide heating element.

[0017] Optionally, a plurality of convex ribs are provided on the outer peripheral surface of the heat-insulating component, and the convex ribs abut against the inner wall of the hand-held part to form a heat-insulating cavity between adjacent convex ribs.

[0018] Optionally, the handheld hair dryer further comprises a circuit assembly, wherein the circuit assembly is at least partially disposed in the second air duct and is located on a side of the silicon carbide heating element away from the first air duct.

[0019] Optionally, an installation cavity is further provided in the air duct portion, and the installation cavity and the first air duct are separated by a partition. The handheld hair dryer further includes a circuit component, and the circuit component is at least partially provided in the installation cavity.

[0020] Optionally, an air outlet is provided at one end of the air duct shell, 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 part away from the air duct part, 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. While ensuring the heating effect, it can reduce the space occupied in the handheld part. Placing the silicon carbide heating element in the second air duct in the handheld part can make full use of the space in the handheld part, improve the space utilization rate in the handheld part, and help to reduce the size of the handheld hair dryer or provide 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 handheld hair dryer of the utility model;

[0024] Figure 2 This is a structural schematic diagram of another embodiment of the handheld hair dryer of the utility model;

[0025] Figure 3 for Figure 2 A cross-sectional view of the handheld hair dryer;

[0026] Figure 4 This is a cross-sectional view of another embodiment of the handheld hair dryer of the utility model;

[0027] Figure 5 for Figure 4 Structural schematic diagram of the middle air guide;

[0028] Figure 6 A cross-sectional view of another embodiment of the handheld hair dryer of the utility model;

[0029] Figure 7 This is a structural schematic diagram of another embodiment of the handheld hair dryer of the utility model;

[0030] Figure 8 for Figure 7 A cross-sectional view of the handheld hair dryer;

[0031] Fig. 9 for Figure 8 The enlarged view of point A in the middle;

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

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

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

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

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

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

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

[0039] Description of Figure Numbers:

[0040] 11. Air duct part; 111. First air duct; 112. Air outlet; 113. Shell; 114. Middle shell; 115. First end face; 116. Through hole; 117. Mounting cavity; 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. Raised rib; 40. Circuit assembly; 50. Heat insulation component; 61. Air guide; 611. Air outlet; 70. Partition

[0041] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

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

[0046] In the embodiment of the present utility model, Figure 1 As shown, the handheld hair dryer includes a shell, a fan assembly 20 and a heating device, the shell includes 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, and the handheld portion 12 is provided with a second air duct 121 connected to the first air duct 111; the fan assembly 20 is installed in the shell to drive the airflow to flow through the second air duct 121 and the first air duct 111 in sequence; the heating device includes a silicon carbide heating element 30, the silicon carbide heating element 30 is arranged in the second air duct 121, and the surface of the silicon carbide heating element 30 forms a heat exchange surface for heat exchange with the airflow flowing through the second air duct 121.

[0047] Specifically, the handheld hair dryer also includes a circuit assembly 40, the fan assembly 20 and the heating device (silicon carbide heating element 30) are electrically connected to the circuit assembly 40, and the circuit assembly 40 has a circuit structure such as a controller and a power supply circuit. The specific circuit structure can refer to the prior art, and the utility model will not repeat it one by one. Optionally, the circuit assembly 40 is also provided with a power cord, and the power cord is connected to an external power supply; or the circuit assembly 40 is provided with a power interface, and the power interface is used to connect the power cord.

[0048] The silicon carbide heating element 30 is a heating structure as a whole, that is, there are at least two spaced connection parts 37 on the silicon carbide heating element 30, and the power supply circuit is connected through at least two connection parts 37. After the power is turned on, the current flows through the silicon carbide heating element 30, thereby converting the electrical energy into thermal energy. When there is airflow flowing 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 electric heating wires, even if a handheld hair dryer 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 116.

[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. The silicon carbide heating element 30 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 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 handheld part 12. Placing the silicon carbide heating element 30 in the second air duct 121 in the handheld part 12 can make full use of the space in the handheld part 12, improve the space utilization rate in the handheld part 12, and help to reduce the size of the handheld hair dryer or provide more possibilities for the installation of other components.

[0051] In this embodiment, an air outlet 112 is provided at one end of the air duct portion 11 , and the air outlet 112 is connected to an end of the first air duct 111 away from the second air duct 121 . This arrangement makes it convenient for the user to point the air outlet 112 toward himself when in use.

[0052] In some embodiments, the silicon carbide heating element 30 is located in the second air duct 121 at one end close to the first air duct 111. This makes the silicon carbide heating element 30 closer to the air outlet 112, which can reduce the flow path of the hot air flow heated by the silicon carbide heating element 30 in the air duct, which is conducive to reducing heat loss.

[0053] In some embodiments, the handheld portion 12 is provided with an air inlet 122 connected to the second air duct 121, and the fan assembly 20 is arranged in the second air duct 121 and between the silicon carbide heating element 30 and the air inlet 122. That is, the fan assembly 20 drives the air flow to flow through itself, and then flows to the first air duct 111 after passing through the silicon carbide heating element 30, so that the hot air flow 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 better cooled.

[0054] Optionally, the air inlet 122 is provided at one end of the handheld portion 12 away from the air duct portion 11, and at least one of the end surface and the peripheral side of the handheld portion 12 is provided with the 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.

[0055] In some embodiments, Figures 2 to 3 As shown, the handheld hair dryer also includes a heat insulating component 50, which is arranged in the handheld part 12 and surrounds the circumference 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 handheld part 12 can be reduced, which is beneficial to reduce heat loss and prevent the handheld part 12 from overheating and scalding the user or causing discomfort during use. Among them, 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 arranged in the channel, and its material can be ABS plastic, PP plastic or heat insulating foam, etc.

[0056] In some embodiments, the outer peripheral surface of the silicon carbide heating element 30 is provided with a convex rib 38 (such as Fig.10 and Fig.11 As shown in FIG. 1 , a slot is provided in the heat insulating component 50, and 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 with the convex rib 38 corresponding to the slot.

[0057] In some embodiments, a plurality of ribs 38 are disposed on the outer circumference of the heat insulating component 50 . The ribs 38 abut against the inner wall of the handle 12 to form a heat insulating cavity between adjacent ribs 38 , which can further enhance the heat insulating effect of the heat insulating component 50 .

[0058] In some embodiments, the handheld hair dryer further includes a circuit assembly 40, and the fan assembly 20 and the silicon carbide heating element 30 are both electrically connected to the circuit assembly 40; the circuit assembly 40 is at least partially disposed in the second air duct 121 and is located on a side of the silicon carbide heating element 30 away from the first air duct 111. Such an arrangement can prevent hot air from passing through the circuit assembly 40, and can also better dissipate heat for the fan assembly 20.

[0059] In some embodiments, Figure 3 or Figure 4 As shown, the air duct portion 11 is further provided with an installation cavity 117, the installation cavity 117 and the first air duct 111 are separated by a partition 70, and the handheld hair dryer further comprises a circuit assembly 40, and the circuit assembly 40 is at least partially arranged in the installation cavity 117. That is, the circuit assembly 40 can be installed in the rear part of the air duct portion 11, which can improve the space utilization rate in the air duct portion 11.

[0060] An air outlet 112 is provided at one end of the air duct shell, and the air outlet 112 is connected to one end of the first air duct 111 away from the second air duct 121 . An air inlet 122 is provided at one end of the handheld part 12 away from the air duct part 11 , and the air inlet 122 is connected to the second air duct 121 .

[0061] In some embodiments, an installation space is further provided in the air duct portion 11, and the installation space is located between the first air duct 111 and the air outlet 112. That is, an installation space is reserved in the air duct portion 11, which can improve the expansibility of the handheld hair dryer. Specifically, since the installation space is located in the air duct portion 11, adjacent to the air outlet 112, devices such as a distance sensor or a negative ion generator can be installed in the installation space during subsequent design.

[0062] In some embodiments, Figure 4 and Figure 5 As shown, an air guide 61 is provided in the first air duct 111, and the air guide 61 has a plurality of air outlet holes 611, each of which extends along the length direction of the first air duct 111 to the air outlet 112, and the plurality of air outlet holes 611 are arranged at intervals along the circumference of the air guide 61. In this way, the air guide 61 can compress the airflow and increase the air outlet speed. Among them, each air outlet hole 611 can be made to pass through both ends of the air guide 61, or a wind gathering hole can be provided at one end of the air guide 61 close to the first air duct 111, and the ends of the plurality of air outlet holes 611 away from the air outlet 112 are all connected to the wind gathering hole.

[0063] In some embodiments, Figure 6As shown, the installation space is at least partially located in the first air duct 111, and the heating device includes two silicon carbide heating elements 30, one of which is located in the second air duct 121, and the other silicon carbide heating element 30 is located in the installation space and in the first air duct 111. In this way, the two silicon carbide heating elements 30 heat the outlet air flow, which can increase the air flow heating effect and improve the air flow temperature.

[0064] In some embodiments, Figures 7 to 9 As shown, the air channel portion 11 is provided with a through hole 116 and an air outlet 112. The through hole 116 runs through both ends of the air channel portion 11. The air outlet 112 is located at one end of the air channel portion 11. The first air channel 111 is located between the outer side surface of the air channel portion 11 and the hole wall of the through hole 116, and is connected to the air outlet 112. By providing the through hole 116 in the air channel portion 11, the weight of the handheld hair dryer can be further reduced, which can be convenient for users to hold and use and carry for travel. Moreover, when the air outlet 112 discharges air, it can drive the airflow in the through hole 116 to flow forward together, which can improve the air discharge effect.

[0065] In some embodiments, the air duct portion 11 includes an outer shell 113 and a middle shell 114, the middle shell 114 is formed with a through hole 116, the outer shell 113 is sleeved outside the middle shell 114, and a first air duct 111 is formed between the outer shell 113 and the middle shell 114. In this way, the outer shell 113 and the middle shell 114 can be formed separately and then assembled, which can simplify the structure of the air duct portion 11.

[0066] In some embodiments, the middle shell 114 has a first end surface 115, the first end surface 115 is provided with an air outlet 112, and the first end surface 115 is inclined toward the through hole 116. This is conducive to guiding the airflow in the through hole 116 to be sent forward together with the outlet airflow, thereby increasing the air supply volume.

[0067] The specific structure of the silicon carbide heating element 30 can be various, for example, Fig.10 and Fig.11 In some embodiments, the silicon carbide heating element 30 includes a spiral body and at least two connection parts 37, both ends of the spiral body are provided with connection parts 37, and a ventilation gap 301 is formed between two adjacent spiral sections of the spiral body. With such a configuration, the surface area of ​​the silicon carbide heating element 30 can be larger under the same volume, and the contact area with the airflow can be increased, thereby improving the heat exchange efficiency. Among them, the silicon carbide heating element 30 can be a planar spiral structure or a tower-shaped spiral structure.

[0068] 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.

[0069] In some other embodiments, reference Fig.12 The silicon carbide heating element 30 includes a plurality of heating segments 33 connected in sequence, and each of the two adjacent heating segments 33 is arranged at an angle, and a ventilation gap 301 is formed between any two heating segments 33. That is, the plurality of heating segments 33 form a bending structure according to a certain rule, so that the heat exchange area of ​​the silicon carbide heating element 30 can be increased.

[0070] In some other embodiments, reference Fig.13 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.

[0071] In some other embodiments, reference Fig.14 The silicon carbide heating element 30 includes an outer ring portion 34, a central portion 35 located inside the outer ring portion 34, and a plurality of connecting portions 36 connected between the central portion 35 and the outer ring portion 34. A ventilation gap 301 is formed between two adjacent connecting portions 36. The outer ring portion 34 and the central portion 35 are respectively provided with a wiring portion 37. Optionally, the plurality of connecting portions 36 are spaced apart along the circumference of the central portion 35 (refer to Fig.14 ); or multiple connecting portions 36 are staggeredly connected (reference Fig.15 or Fig.16 ).

[0072] 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.

[0073] 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.

[0074] 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 handheld hair dryer, 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, and the handheld portion is provided with a second air duct connected to the first air duct; 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 in the second air duct. The silicon carbide heating element is provided with at least two spaced-apart wiring parts, and the surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow flowing through the second air duct.

2. The handheld hair dryer according to claim 1, characterized in that: The silicon carbide heating element is located in the second air duct at one end close to the first air duct.

3. The handheld hair dryer according to claim 2, characterized in that: The handheld portion is provided with an air inlet connected to the second air duct, and the fan assembly is arranged in the second air duct and between the silicon carbide heating element and the air inlet.

4. The handheld hair dryer according to claim 1, characterized in that: The silicon carbide heating element is in a columnar structure extending along the length direction of the second air duct as a whole.

5. The handheld hair dryer according to claim 1, characterized in that: The silicon carbide heating element comprises a spiral body and at least two connecting parts, both ends of the spiral body are provided with the connecting parts, and a ventilation gap is formed between two adjacent spiral segments 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 the free end of each second heating segment is provided with the wiring portion; Alternatively, the silicon carbide heating element comprises an outer ring portion, a central portion located within the outer ring portion, and a plurality of connecting portions connected between the central portion and the outer ring portion, the plurality of connecting portions are spaced apart along the circumference of the central portion or the plurality of connecting portions are staggered and connected, a ventilation gap is formed between two adjacent connecting portions, the outer ring portion and the central portion are respectively provided with the 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 the 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.

6. The handheld hair dryer according to claim 1, characterized in that: The handheld hair dryer further comprises a heat insulating component, which is arranged in the handheld portion and surrounds the circumference of the silicon carbide heating element.

7. The handheld hair dryer according to claim 6, characterized in that: The outer peripheral surface of the heat insulation component is provided with a plurality of convex ribs, and the convex ribs abut against the inner wall of the hand-held part to form a heat insulation cavity between adjacent convex ribs.

8. The handheld hair dryer according to claim 1, characterized in that: The handheld hair dryer further comprises a circuit assembly, wherein the circuit assembly is at least partially disposed in the second air duct and is located at a side of the silicon carbide heating element away from the first air duct.

9. The handheld hair dryer according to claim 1, characterized in that: An installation cavity is also provided in the air duct portion, and the installation cavity and the first air duct are separated by a partition. The handheld hair dryer also includes a circuit component, and the circuit component is at least partially provided in the installation cavity.

10. The handheld hair dryer according to claim 9, characterized in that: An air outlet is provided at one end of the air duct shell, 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 hand-held part away from the air duct part, and the air inlet is connected to the second air duct.

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