Electric heating air duct

Abstract

The utility model discloses an electric heating air duct which comprises a shell, a fan assembly and a heating device, the shell comprises an air duct part and a handheld part connected to one side of the air duct part, an air inlet is formed in one end of the air duct part, and an air outlet is formed in the other end of the air duct part. The air duct part is provided with a mounting section close to the air inlet and an air guide section extending from the mounting section to the air outlet, the radial size of the mounting section is larger than that of the air guide section, and the air guide section is gradually shrunk in the direction away from the mounting section; the fan assembly is arranged in the mounting section; the heating device comprises a silicon carbide heating body, the silicon carbide heating body is arranged in the air guide section or the mounting section, and a heat exchange surface is formed on the surface of the silicon carbide heating body so as to exchange heat with airflow flowing through the air duct part. According to the technical scheme, the air outlet speed of the electric heating air duct can be increased.

Description

Technical Field

[0001] The utility model relates to the field of hair drying devices, in particular to an electric heating hair dryer. Background Art

[0002] At present, electric hair dryers (hair dryers) have become personal care products frequently used in daily life, mainly used for drying hair and hair styling, etc. At present, in some electric hair dryers, the wind speed is increased by increasing the power of the motor and the size of the fan blades, and the hair is quickly dried by high-speed airflow. Since the heating device of the traditional electric hair dryer generally uses a heating wire wrapped around an insulating bracket to generate heat, such a heating device is large in size, resulting in a large size of the air duct near the air outlet, making it difficult to give full play to the advantages of the motor and the large-sized fan blades, resulting in poor effect of increasing the wind speed. Utility Model Content

[0003] The main purpose of the utility model is to provide an electric heating hairdryer, aiming to increase the air outlet speed of the electric heating hairdryer.

[0004] To achieve the above purpose, the electric heating hairdryer proposed by the utility model comprises:

[0005] The housing comprises an air duct portion and a hand-held portion connected to one side of the air duct portion, wherein one end of the air duct portion is provided with an air inlet, and the other end is provided with an air outlet, the air duct portion comprises a mounting section close to the air inlet and an air guide section extending from the mounting section toward the air outlet, the radial dimension of the mounting section is greater than the radial dimension of the air guide section, and the air guide section is gradually reduced in a direction away from the mounting section;

[0006] a fan assembly disposed in the mounting section; and

[0007] The heating device comprises a silicon carbide heating element, which is arranged in the air guide section or the installation section. The surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow flowing through the air duct section.

[0008] Optionally, the silicon carbide heating element includes 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 spirally outward 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.

[0009] Optionally, the silicon carbide heating element includes 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.

[0010] Optionally, the silicon carbide heating element includes 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 wiring portions; the central portion is provided with a plurality of airflow holes, and an extension direction of the airflow holes is consistent with the flow direction of the airflow in the air duct portion.

[0011] Optionally, the silicon carbide heating element is provided with a plurality of air flow holes, the air flow holes are through-through at both ends, the extension direction of the air flow holes is consistent with the air flow direction in the air duct part, and the outer side and the central area of ​​the silicon carbide heating element are respectively provided with wiring parts.

[0012] 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.

[0013] Optionally, the silicon carbide heating element as a whole is a columnar structure extending along the length direction of the air duct portion.

[0014] Optionally, the electric hot air cylinder further includes a heat insulating component, which is disposed in the air duct portion and surrounds the circumference of the silicon carbide heating element.

[0015] Optionally, the fan assembly includes a sleeve, a motor fixed in the sleeve, and a fan blade installed on the motor, and the heat insulation component is connected to the sleeve.

[0016] Optionally, the silicon carbide heating element is arranged between the air outlet and the fan assembly.

[0017] 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, the occupied space in the air duct can be reduced. By arranging a mounting section close to the air inlet and an air guide section extending from the mounting section to the air outlet on the air duct section, the radial dimension of the mounting section is larger than the radial dimension of the air guide section, and the air guide section is gradually set in the direction away from the mounting section. In this way, when the fan assembly is arranged in the mounting section, there is a large space for the fan assembly to be installed, that is, the size of the fan blades in the fan assembly can be increased to increase the air intake, and the air guide section that is gradually set in the direction away from the mounting section can better compress the airflow and increase the air outlet speed, which can facilitate users to quickly dry their hair or clothes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 This is a schematic structural diagram of an embodiment of the electric heating air dryer of the utility model;

[0020] Figure 2 for Figure 1 A cross-sectional view of the electric hot air duct;

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the silicon carbide heating element;

[0022] Figure 4 for Figure 3 A schematic diagram of the structure of the silicon carbide heating element from another angle;

[0023] Figure 5 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the electric heating air duct of the utility model;

[0024] Figure 6 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the subject of the utility model;

[0025] Figure 7 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0026] Figure 8 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the subject of the utility model;

[0027] 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.

[0028] Description of Figure Numbers:

[0029] 11. Air duct; 111. Air inlet; 112. Air outlet; 113. Mounting section; 114. Air guide section; 12. Handheld section; 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 section; 37. Wiring section; 38. Raised rib; 40. Circuit assembly; 50. Heat insulation component

[0030] 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

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The utility model provides an electric heating hairdryer.

[0035] In the embodiment of the present utility model, Figures 1 to 4 As shown, the electric hot air dryer comprises:

[0036] The housing comprises an air duct portion 11 and a hand-held portion 12 connected to one side of the air duct portion 11. An air inlet 111 is provided at one end of the air duct portion 11, and an air outlet 112 is provided at the other end. The air duct portion 11 has a mounting section 113 close to the air inlet 111 and an air guide section 114 extending from the mounting section 113 toward the air outlet 112. The radial dimension of the mounting section 113 is greater than the radial dimension of the air guide section 114, and the air guide section 114 is gradually reduced in a direction away from the mounting section 113.

[0037] The fan assembly 20 is disposed in the installation section 113; and

[0038] The heating device includes a silicon carbide heating element 30 , which is disposed in the air guide section 114 or the installation section 113 . The surface of the silicon carbide heating element 30 forms a heat exchange surface for heat exchange with the air flow passing through the air duct portion 11 .

[0039] Specifically, the electric hot air duct 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.

[0040] Optionally, at least one of the end surface and the peripheral side of the air duct portion 11 is provided with an air inlet 111. That is, the air inlet 111 can be provided on the peripheral side of the air duct portion 11, the air inlet 111 can also be provided on the end surface of the air duct portion 11, or the air inlet 111 can also be provided on both the peripheral side and the end surface of the air duct portion 11.

[0041] 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 electric heating hair dryer is used for a long time, it will not cause the silicon carbide heating element 30 to be disconnected. The surface of the silicon carbide heating element 30 refers to the surface of the silicon carbide heating element 30 that is exposed to the air and can contact the airflow, including the gap wall surface formed by the silicon carbide heating element 30 and the inner wall surface of the through hole.

[0042] 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.

[0043] 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. By arranging an installation section 113 close to the air inlet 111 and an air guide section 114 extending from the installation section 113 toward the air outlet 112 on the air duct part 11, the radial dimension of the installation section 113 is larger than the radial dimension of the air guide section 114, and the air guide section 114 is gradually reduced in the direction away from the installation section 113. In this way, when the fan assembly 20 is arranged in the installation section 113, there is a larger space for the installation of the fan assembly 20, that is, the size of the fan blades in the fan assembly 20 can be increased to increase the air intake volume, and the air guide section 114 that is gradually arranged in the direction away from the installation section 113 can better compress the airflow and increase the air outlet speed of the air outlet 112, which can facilitate users to quickly dry their hair or clothes.

[0044] In some embodiments, the electric hot air dryer further includes a heat insulating component 50, which is disposed in the air duct portion 11 and surrounds the circumference of the silicon carbide heating element 30. This can reduce the heat conduction of the silicon carbide heating element 30 to the outer surface of the air duct portion 11, which is beneficial to reduce heat loss and prevent the handheld portion 12 from overheating and scalding the user or causing discomfort during use. 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.

[0045] 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.

[0046] In some embodiments, the fan assembly 20 includes a sleeve, a motor fixed in the sleeve, and a fan blade installed on the motor, and the heat insulating component 50 is connected to the sleeve. In this way, the airflow can be smoothly guided to the heat insulating component 50, which can reduce losses.

[0047] In some embodiments, the silicon carbide heating element 30 is disposed between the air outlet 112 and the fan assembly 20. This arrangement can prevent the hot air flow from passing through the fan assembly 20, and can also better dissipate heat for the fan assembly 20.

[0048] The specific structure of the silicon carbide heating element 30 can be various, for example, Figure 3 and Figure 4 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.

[0049] 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.

[0050] In some other embodiments, reference Figure 5 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.

[0051] In some other embodiments, reference Figure 6 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 duct portion 11, and the outer side and the central area of ​​the silicon carbide heating element 30 are respectively provided with wiring portions 37.

[0052] In some other embodiments, reference Figure 7 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 7 ); or multiple connecting portions 36 are staggeredly connected (reference Figure 8 or Fig. 9 ).

[0053] 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 air duct portion 11. This can also make the heat exchange area of ​​the silicon carbide heating element 30 larger, and can improve the heat exchange efficiency.

[0054] In some embodiments, the silicon carbide heating element 30 is in a cylindrical structure extending along the length direction of the air duct portion 11. 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.

[0055] 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. An electric heating hairdryer, characterized in that: include: The housing comprises an air duct portion and a hand-held portion connected to one side of the air duct portion, wherein one end of the air duct portion is provided with an air inlet, and the other end is provided with an air outlet, the air duct portion comprises a mounting section close to the air inlet and an air guide section extending from the mounting section toward the air outlet, the radial dimension of the mounting section is greater than the radial dimension of the air guide section, and the air guide section is gradually reduced in a direction away from the mounting section; A fan assembly is arranged in the installation section; as well as The heating device comprises a silicon carbide heating element, which is arranged in the air guide section or the installation section. The surface of the silicon carbide heating element forms a heat exchange surface to exchange heat with the airflow flowing through the air duct section.

2. The electric hot air dryer according to claim 1, characterized in that: The silicon carbide heating element includes 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 spirally outward 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.

3. The electric hot air dryer according to claim 1, characterized in that: The silicon carbide heating element comprises a spiral body and at least two connection parts. The connection parts are arranged at both ends of the spiral body. A ventilation gap is formed between two adjacent spiral sections of the spiral body.

4. The electric hot air dryer according to claim 1, characterized in that: The silicon carbide heating element includes 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 are staggered and connected to each other. A ventilation gap is formed between two adjacent connecting portions. The outer ring portion and the central portion are respectively provided with wiring portions; the central portion is provided with a plurality of airflow holes, and an extension direction of the airflow holes is consistent with a flow direction of the airflow in the air duct portion.

5. The electric hot air dryer according to claim 1, characterized in that: The silicon carbide heating element is provided with a plurality of air flow holes, which are through-going at both ends. The extension direction of the air flow holes is consistent with the flow direction of the air flow in the air duct part. The outer side and the central area of ​​the silicon carbide heating element are respectively provided with connection parts.

6. The electric hot air dryer according to claim 1, characterized in that: The silicon carbide heating element comprises a plurality of heating segments connected in sequence, and any two adjacent heating segments are arranged at an angle, and any two heating segments are spaced to form a ventilation gap.

7. The electric hot air dryer according to any one of claims 1 to 6, characterized in that: The silicon carbide heating element is in a columnar structure extending along the length direction of the air duct portion as a whole.

8. The electric hot air dryer according to any one of claims 1 to 6, characterized in that: The electric heating air cylinder further comprises a heat insulating component, which is arranged in the air duct portion and surrounds the circumference of the silicon carbide heating element.

9. The electric hot air dryer according to claim 8, characterized in that: The fan assembly includes a sleeve, a motor fixed in the sleeve and a fan blade installed on the motor, and the heat insulation component is connected to the sleeve.

10. The electric hot air dryer according to claim 1, characterized in that: The silicon carbide heating element is arranged between the air outlet and the fan assembly.

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