Overheat protection structure and hair drying device

Abstract

The present invention belongs to the technical field of handheld appliances, and in particular, relates to an over-temperature protection structure and a hair drying device. The over-temperature protection structure includes a body, a heater and a first over-temperature protection member. The heater includes an inner layer and a heating element. The inner layer is located on the inner side of the heating element and is used to support the heating element. The first over-temperature protection member is arranged on the inner side of the heating element. In this way, when the temperature of the heater is high, the heater is disconnected from the power supply and the heater stops working, thereby avoiding damage to the heater and surrounding components due to overheating, thereby protecting the entire hair drying device. Compared with the over-temperature protection member arranged outside the heater, the first over-temperature protection member of the hair drying device is arranged inside the heater. In this way, the temperature standard for cutting off the power supply of the first over-temperature protection member is the temperature inside the heater, so that the temperature of the heater can be more intuitively reflected, so as to improve the safety performance and use performance of the hair drying device.

Description

Technical Field

[0001] The invention belongs to the technical field of handheld appliances, and in particular relates to an over-temperature protection structure and a hair drying device. Background Art

[0002] Hair drying devices are mostly used for drying and shaping hair, and can also be used for other drying and art purposes. Existing hair drying devices generally rely on a motor to drive a fan to rotate. When the fan rotates, air can enter from a fluid inlet and then blow out from a fluid outlet to form a fluid, thereby achieving the purpose of drying and shaping.

[0003] The heater is used to heat the fluid entering from the fluid inlet so that the fluid flowing out from the fluid outlet has a certain temperature. During the outflow process of the fluid heated by the heater, the temperature of the parts around the heater will rise accordingly. When the temperature of the fluid and the heater rises to a certain temperature, it will affect the surrounding parts and even cause damage to the parts. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an over-temperature protection structure and a hair drying device in view of the technical defect that the over-high temperature of the heater of the existing hair dryer may cause damage to surrounding parts.

[0005] In order to solve the above technical problems, on the one hand, an embodiment of the present invention provides an over-temperature protection structure for a hair drying device, comprising a body, a heater and a first over-temperature protection member, wherein a fluid channel is formed in the body, and the heater is disposed in the fluid channel and is used to heat a fluid medium in the fluid channel;

[0006] The heater comprises an inner layer and a heating element, wherein the inner layer is located on the inner side of the heating element and is used to support the heating element, and the first over-temperature protection component is arranged on the inner side of the heating element.

[0007] Optionally, the inner layer is a plastic layer, a first through hole is formed on the inner layer, and the first over-temperature protection component is arranged in the first through hole.

[0008] Optionally, a first mounting column is provided on the outer wall of the inner layer, the first over-temperature protection component includes a first temperature measuring part and a first connecting part connected to the first temperature measuring part, the first temperature measuring part is arranged in the first through hole, and the first connecting part is connected to the first mounting column.

[0009] Optionally, the over-temperature protection structure further includes a second over-temperature protection member, and the second over-temperature protection member is arranged on the inner side of the heating element.

[0010] Optionally, the first over-temperature protection component is used to cut off the connection between the heater and the power supply when the temperature inside the heater is above a first preset value, and the second over-temperature protection component is used to cut off the connection between the heater and the power supply when the temperature inside the heater is above a second preset value, and restore the connection between the heater and the power supply when the temperature inside the heater is less than the second preset value;

[0011] The second preset value is smaller than the first preset value.

[0012] Optionally, a second through hole is opened on the inner layer, and the second over-temperature protection component is arranged in the second through hole.

[0013] Optionally, a second mounting column is provided on the outer wall of the inner layer, the second over-temperature protection component includes a second temperature measuring part and a second connecting part connected to the second temperature measuring part, the second temperature measuring part is arranged in the second through hole, and the first connecting part is connected to the second mounting column.

[0014] Optionally, a support member is provided on the outer wall of the inner layer, and the heating element is mounted on the support member.

[0015] Optionally, the inner layer is a cylinder, there are multiple support members, the heating element includes multiple heating wires, the multiple support members are arranged at intervals along the circumference of the inner layer, the support members extend along the axial direction of the inner layer, and the support members are provided with multiple positioning grooves extending along the radial direction of the inner layer;

[0016] The plurality of heating wires are arranged at intervals along the axial direction of the inner layer, and a positioning portion which can be accommodated in the positioning groove is formed on the heating wire.

[0017] Optionally, a first avoidance space for accommodating the first over-temperature protection component is formed on the heating wire.

[0018] Optionally, a second avoidance space for accommodating the second over-temperature protection component is formed on the heating wire.

[0019] Optionally, at least one of the support members is disposed between the first avoidance space and the second avoidance space in the circumferential direction of the inner layer, and at least one of the positioning portions is disposed between the first avoidance space and the second avoidance space on the heating wire.

[0020] Optionally, the heater further comprises an outer layer, and the heating element is located between the inner layer and the outer layer.

[0021] In the over-temperature protection structure of the hair drying device provided in the above embodiment, the first over-temperature protection member is arranged inside the heater, so that when the temperature of the heater is high, the heater is disconnected from the power supply and stops working, thereby avoiding damage to the heater and surrounding parts due to overheating, thereby protecting the entire over-temperature protection structure and the hair drying device. The first over-temperature protection member of the hair drying device is arranged inside the heater, so that the temperature standard for cutting off the power supply of the first over-temperature protection member is the temperature inside the heater, thereby more intuitively reflecting the temperature of the heater, thereby improving the safety performance and use performance of the hair drying device.

[0022] On the other hand, another embodiment of the present invention further provides a hair drying device, comprising the above-mentioned over-temperature protection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a hair drying device provided by an embodiment of the present invention;

[0024] Figure 2 is a cross-sectional schematic diagram of a hair drying device provided by an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of a heater of a hair drying device provided by an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 Side view of

[0027] Figure 5 is a schematic structural diagram of a hair drying device provided by an embodiment of the present invention with its heater removed from the outer layer;

[0028] Figure 6 yes Figure 5 Side view of

[0029] Figure 7 It is a schematic diagram of the structure of the inner layer of a hair drying device provided by an embodiment of the present invention.

[0030] The reference numerals in the specification are as follows:

[0031] 10. Hair drying device;

[0032] 100, handle; 101, first fluid channel; 103, first section; 105, second section; 110, first end; 120, second end; 112, first fluid inlet;

[0033] 200, body; 201, second fluid channel; 210, first end; 212, second fluid inlet; 220, second end; 222, first fluid outlet; 224, second fluid outlet; 230, housing; 240, tube body;

[0034] 300, fan assembly;

[0035] 400, heater; 410, inner layer; 4102, first mounting hole; 4104, first mounting column; 4106, second mounting column; 4108, support member; 41082, positioning groove; 420, outer layer; 430, heating wire; 4302, positioning part; 4304, first U-shaped structure; 4306, second U-shaped structure;

[0036] 500, first over-temperature protection component; 510, first temperature measuring portion; 520, first connecting portion;

[0037] 600, second over-temperature protection member; 610, second temperature measuring portion; 620, second connecting portion;

[0038] 700. Temperature detector. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0040] like Figure 1 and Figure 2 As shown, the hair drying device 10 in one embodiment includes a handle 100 and a body 200. The body 200 is connected to the handle 100. The handle 100 and the body 200 are provided with a first fluid channel 101 for fluid flow. The handle 100 has a first fluid inlet 112. The body 200 has a first fluid outlet 222. The first fluid inlet 112 and the first fluid outlet 222 are connected to form the first fluid channel 101. The first fluid inlet 112 and the first fluid outlet 222 are respectively used for fluid to flow into and out of the first fluid channel 101.

[0041] like Figure 1 and Figure 2As shown, in one embodiment, the handle 100 includes a first end 110 and a second end 120 disposed oppositely. The second end 120 of the handle 100 is connected to the body 200. The first fluid inlet 112 is disposed at the first end 110 of the handle 100. The body 200 includes a first end 210 and a second end 220 disposed oppositely. The first fluid outlet 222 is disposed at the second end 220 of the body 200.

[0042] Further, in this embodiment, the first fluid channel 101 is nonlinear. The first fluid channel 101 includes a first section 103 and a second section 105 that are connected. The extension direction of the first section 103 is perpendicular to the extension direction of the second section 105. The first section 103 is located in the handle 100. The second section 105 is located in the body 200. That is, the fluid flows through the handle 100 along the first section 103 of the first fluid channel 101 and flows through the body 200 along the second section 105 of the first fluid channel 101.

[0043] like Figure 1 and Figure 2 As shown, in one embodiment, the hair drying device 10 further comprises a fan assembly 300. The fan assembly 300 is disposed in the first fluid channel 101. In this embodiment, the fan assembly 300 is located in the first section 103 of the first fluid channel 101. The fan assembly 300 is used to draw fluid through the first fluid inlet 112 into the first fluid channel 101.

[0044] like Figure 2 As shown, in one embodiment, the body 200 further has a second fluid inlet 212 and a second fluid outlet 224. The second fluid inlet 212 and the second fluid outlet 224 are connected to form a second fluid channel 201. The second fluid inlet 212 and the second fluid outlet 224 are respectively used to allow another fluid to flow into and out of the second fluid channel 201. In this embodiment, the second fluid inlet 212 is provided at the first end 210 of the body 200. The second fluid outlet 224 is provided at the second end 220 of the body 200.

[0045] When the fan assembly 300 is in operation, the fan assembly 300 draws fluid, allowing it to pass through the first fluid inlet 112 into the first fluid channel 101 and reach the first fluid outlet 222. The fluid that flows through the body 200 and flows out from the first fluid outlet 222 causes another stream of fluid to be entrained or pulled into the second fluid channel 201 at the second fluid inlet 212, and flows along the second fluid channel 201 toward the second fluid outlet 224. The other stream of fluid that flows out through the second fluid outlet 224 merges with the fluid that flows out through the first fluid outlet 222 at the second end 220 of the body 200, thereby increasing the outflow rate of the fluid of the hair drying device 10.

[0046] like Figure 2 As shown, in one embodiment, the body 200 includes a housing 230 and a tube 240 passing through the housing 230. The second fluid channel 201 is defined by the tube 240. The second fluid channel 201 extends from the second fluid inlet 212 to the second fluid outlet 224 in the tube 240. The second section 105 of the first fluid channel 101 is defined by a gap between the tube 240 and the side wall of the housing 230. The cross section of the first fluid outlet 222 is annular. The first fluid outlet 222 extends around the second fluid channel 201.

[0047] like Figure 2 As shown, in one embodiment, the hair drying device 10 further comprises a heater 400. The heater 400 is disposed in the first fluid channel 101. In this embodiment, the heater 400 is located in the second section 105 of the first fluid channel 101. The heater 400 extends around the tube body 240. The heater 400 is used to heat the fluid in the first fluid channel 101.

[0048] In this embodiment, for ease of description, the end of the heater 400 close to the first fluid outlet 222 is defined as the downstream end of the heater 400, and the end of the heater 400 away from the first fluid outlet 222 is defined as the upstream end of the heater 400. The fluid enters the first fluid channel 101 through the first fluid inlet 112 and flows from the upstream end of the heater 400 through the downstream end of the heater 400, and then continues to flow along the first fluid channel 101 and reaches the first fluid outlet 222, thereby realizing the heater 400 to selectively directly heat the fluid in the first fluid channel 101. In addition, another fluid flowing through the second fluid channel 201 can also be indirectly heated by the heater 400.

[0049] The over-temperature protection structure of this embodiment includes a first over-temperature protection component 500 and the above-mentioned body 200 and heater 400. The first over-temperature protection component 500 is arranged in the heater 400. The first over-temperature protection component 500 is used to cut off the connection between the heater 400 and the power supply when the temperature in the heater 400 is above a first preset value.

[0050] In the over-temperature protection structure of the hair drying device 10 provided in the above embodiment, the first over-temperature protection member is arranged in the heater 400, so that when the temperature of the heater is high, the heater 400 is disconnected from the power supply, and the heater 400 stops working, thereby avoiding damage to the heater 400 and surrounding parts due to overheating, thereby protecting the entire over-temperature protection structure and the hair drying device 10. The first over-temperature protection member 500 of the hair drying device 10 is arranged in the heater 400, so that the temperature standard for cutting off the power supply of the first over-temperature protection member 500 is the temperature inside the heater 400, thereby more intuitively reflecting the temperature of the heater 400, so as to improve the safety performance and use performance of the hair drying device 10.

[0051] The fluid channel of the over-temperature protection structure in this embodiment is the second section 105 formed in the body 200 of the first fluid channel 101 .

[0052] like Figure 3 As shown, the heater 400 includes an inner layer 410 , an outer layer 420 and a heating element 430 . The heating element 430 is disposed between the inner layer 410 and the outer layer 420 . The inner layer 410 is located inside the heating element 430 and is used to support the heating element 430 .

[0053] However, in other embodiments, the heater 400 may also omit the outer layer 420 disposed on the outer side of the heating element 430 .

[0054] like Figure 7 As shown, the inner layer 410 is provided with a first mounting hole 4102 penetrating the wall of the inner layer 410, the first over-temperature protection member 500 includes a first temperature measuring portion 510 and a first connecting portion 520 connected to the first temperature measuring portion 510, and the outer wall of the inner layer 410 is provided with a first mounting post 4104, the number of the first connecting portion 520 and the first mounting post 4104 are both two, the two first connecting portions 520 are respectively connected to the two ends of the first temperature measuring portion 510, and the first connecting portions 520 are fixed on the corresponding first mounting posts 4104, so that the first temperature measuring portion 510 can be suspended in the first mounting hole 4102. Preferably, at least part of the structure of the first temperature measuring portion 510 is located on the inner side of the inner wall of the inner layer 410. In this way, the temperature detected by the first over-temperature protection member 500 is the temperature in the inner layer 410, and when the hair drying device 10 of the above embodiment is in use, the temperature of the heater 400 can be more intuitively reflected, so as to improve the safety performance and use performance of the hair drying device 10.

[0055] like Figure 2 , Figure 3 and Figure 7As shown, the over-temperature protection structure further includes a second over-temperature protection member 600, which is disposed in the heater 400. The second over-temperature protection member 600 is used to cut off the connection between the heater 400 and the power supply when the temperature in the heater 400 is above a second preset value, and to restore the connection between the heater 400 and the power supply when the temperature in the heater 400 is lower than the second preset value, and the second preset value is lower than the first preset value.

[0056] In this embodiment, the first over-temperature protection component 500 includes but is not limited to a thermal fuse, and the second over-temperature protection component 600 can be a temperature switch, a metal spring, or other components.

[0057] like Figure 2 , Figure 3 and Figure 7 As shown, the second over-temperature protection member 600 is arranged on the outer wall of the inner layer 410, wherein the second over-temperature protection member 600 includes a second temperature measuring portion 610 and a second connecting portion 620 connected to the second temperature measuring portion 610, and a second mounting column 4106 is arranged on the outer wall of the inner layer 410, and the number of the second connecting portion 620 and the second mounting column 4106 is two, and the two second connecting portions 620 are respectively connected to the two ends of the second temperature measuring portion 610, and the second connecting portion 620 is fixed on the corresponding second mounting column 4106, wherein the second temperature measuring portion 610 is exposed on the outer wall of the inner layer 410. At this time, the temperature standard for the second over-temperature protection member 600 to disconnect or connect the heater 400 and the power supply is the temperature between the inner layer 410 and the heating element 430.

[0058] However, in other embodiments, the second over-temperature protection component 600 can also be configured similarly to the first over-temperature protection component 500, that is, a second mounting hole is provided on the outer wall of the inner layer 410, and the second temperature measuring part 610 of the second over-temperature protection component 600 is suspended in the second mounting hole. At this time, the temperature standard for the second over-temperature protection component 600 to disconnect or connect the heater 400 and the power supply is the temperature inside the inner layer 410.

[0059] Alternatively, the first temperature measuring portion 510 of the first over-temperature protection member 500 is exposed to the outer wall of the inner layer 410. In this case, the temperature standard for the first over-temperature protection member 500 to disconnect the heater 400 from the power supply is the temperature between the heating element 430 and the inner layer 410. The specific installation methods of the first over-temperature protection member 500 and the second over-temperature protection member 600 are not limited to each other, that is, the specific installation method of the first over-temperature protection member 500 and the specific installation method of the second over-temperature protection member 600 can be the same or different.

[0060] Specifically, in this embodiment, the inner layer 410 is made of plastic material. Plastic material has better plasticity and higher hardness than traditional mica material, which is conducive to setting the inner layer 410 used to support the heating element 430 into other shapes and relatively fixed, and is conducive to opening the first mounting hole 4102 and the second mounting hole on the inner layer 410, thereby realizing the installation and fixation of the first over-temperature protection component 500 and the second over-temperature protection component 600 in the heater 400, greatly improving the load-bearing adaptability of the heater 400. The outer layer 420 is made of insulating material, preferably, the outer layer 420 is made of mica.

[0061] The first over-temperature protection member 500 and the second over-temperature protection member 600 are not affected by the fluid medium in the first fluid channel 101 in normal use. However, when blockage and abnormal heating occur in the first fluid channel 101 so that the temperature in the heater 400 is above the second preset value, that is, the temperature in the heater 400 is greater than or equal to the second preset value, the second over-temperature protection member 600 disconnects the heater 400 from the power supply. When the blockage and abnormal heating are eliminated so that the temperature in the heater 400 is less than the second preset value, the second over-temperature protection member 600 restores the connection between the heater 400 and the power supply, and the hair drying device 10 resumes use.

[0062] When the second over-temperature protection component 600 fails, blockage and abnormal heating occur in the first fluid channel 101 so that the temperature in the heater 400 is above the first preset value, and the first over-temperature protection component 500 disconnects the heater 400 from the power supply, thereby protecting the heater 400 and components around the heater 400.

[0063] In this embodiment, the heater 400 is connected to a controller, the controller is located in the first fluid channel 101, the first temperature measuring portion 510 of the first over-temperature protection element 500 is connected to the controller through the first connecting portion 520 and the wire, and the second temperature measuring portion 610 of the second over-temperature protection element 600 is connected to the controller through the second connecting portion 620 and the wire. Specifically, the first over-temperature protection element 500 and the second over-temperature protection element 600 are both arranged on the connection path between the heater 400 and the controller, and the power supply supplies power to the heater 400 through the controller, so that the first over-temperature protection element 500 can disconnect or restore the connection between the heater 400 and the power supply, and the second over-temperature protection element 600 can disconnect or restore the connection between the heater 400 and the power supply.

[0064] In such Figures 3 to 7 In the illustrated embodiment, the hair drying device 10 further includes a temperature detector 700 electrically connected to the controller, and the controller can control the heating temperature of the heater 400 according to the detection result of the temperature detector 700 .

[0065] like Figure 7As shown, a support member 4108 is provided on the outer wall of the inner layer 410, and the heating element 430 is mounted on the support member 4108. The heating element 430 includes a plurality of heating wires, and the number of the support members 4108 is multiple, and the heating wires are mounted on the support members 4108 one by one.

[0066] Specifically, the inner layer 410 and the outer layer 420 are cylindrical, a plurality of support members 4108 are arranged at intervals along the circumference of the inner layer 410, the support members 4108 extend along the axial direction of the inner layer 410, a plurality of positioning grooves 41082 extending along the radial direction of the inner layer 410 are provided on the support members 4108, a plurality of heating wires are arranged at intervals along the axial direction of the inner layer 410, and a positioning portion 4302 that can be accommodated in the positioning groove 41082 is formed on the heating wire.

[0067] like Figure 4 and Figure 6 As shown, the heating wire is formed with a first escape space 4304 for accommodating the first over-temperature protection member 500 and a second escape space 4306 for accommodating the second over-temperature protection member 600. Specifically, the first escape space 4304 is a first U-shaped structure formed on the heating wire with an opening toward the inner layer 410, and the second escape space 4306 is a second U-shaped structure formed on the heating wire with an opening toward the inner layer 410, and the first over-temperature protection member 500 is disposed in the opening of the first U-shaped structure. The second over-temperature protection member 600 is disposed in the opening of the second U-shaped structure.

[0068] However, in other embodiments, the first avoidance space 4304 may also be a semicircular structure or a semi-elliptical structure formed on the heating wire with an opening toward the inner layer 410, and similarly, the second avoidance space 4306 may also be a semicircular structure or a semi-elliptical structure formed on the heating wire with an opening toward the inner layer 410. The specific implementations of the first avoidance space 4304 and the second avoidance space 4306 may be the same or different.

[0069] like Figure 7 As shown, at least one support member 4108 is provided between the first U-shaped structure and the second U-shaped structure in the circumferential direction of the inner layer 410, and at least one positioning portion 4302 is provided between the first U-shaped structure and the second U-shaped structure of the heating wire. That is, the first U-shaped structure and the second U-shaped structure can be arranged adjacent to each other or spaced apart. When the first U-shaped structure and the second U-shaped structure are arranged adjacent to each other, a support frame is provided between the first U-shaped structure and the second U-shaped structure to strengthen the structural strength of the first U-shaped structure and the second U-shaped structure. That is, it is ensured that at least one support member 4108 is provided between the first avoidance space 4304 and the second avoidance space 4306 in the circumferential direction of the inner layer 410.

[0070] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An over-temperature protection structure for a hair drying device, characterized in that: It comprises a body, a heater and a first over-temperature protection member, wherein a fluid channel is formed in the body, and the heater is arranged in the fluid channel and is used to heat the fluid medium in the fluid channel; The heater comprises an inner layer and a heating element, wherein the inner layer is located inside the heating element and is used to support the heating element, and the first over-temperature protection member is arranged inside the heating element; The inner layer is a plastic layer, a first through hole is formed on the inner layer, and the first over-temperature protection component is arranged in the first through hole.

2. The over-temperature protection structure according to claim 1, characterized in that: A first mounting column is arranged on the outer wall of the inner layer, and the first over-temperature protection component includes a first temperature measuring part and a first connecting part connected to the first temperature measuring part, the first temperature measuring part is arranged in the first through hole, and the first connecting part is connected to the first mounting column.

3. The over-temperature protection structure according to claim 2, characterized in that: The over-temperature protection structure further includes a second over-temperature protection member, which is disposed on the inner side of the heating element.

4. The over-temperature protection structure according to claim 3, characterized in that: The first over-temperature protection element is used to cut off the connection between the heater and the power supply when the temperature inside the heater is above a first preset value, and the second over-temperature protection element is used to cut off the connection between the heater and the power supply when the temperature inside the heater is above a second preset value, and restore the connection between the heater and the power supply when the temperature inside the heater is lower than the second preset value; The second preset value is smaller than the first preset value.

5. The over-temperature protection structure according to claim 4, characterized in that: The inner layer is provided with a second through hole, and the second over-temperature protection component is arranged in the second through hole.

6. The over-temperature protection structure according to claim 5, characterized in that: A second mounting column is arranged on the outer wall of the inner layer, the second over-temperature protection component includes a second temperature measuring part and a second connecting part connected to the second temperature measuring part, the second temperature measuring part is arranged in the second through hole, and the first connecting part is connected to the second mounting column.

7. The over-temperature protection structure according to claim 3, characterized in that: A support is provided on the outer wall of the inner layer, and the heating element is mounted on the support.

8. The over-temperature protection structure according to claim 7, characterized in that: The inner layer is a cylinder, there are a plurality of support members, the heating element comprises a plurality of heating wires, the plurality of support members are arranged at intervals along the circumference of the inner layer, the support members extend along the axial direction of the inner layer, and a plurality of positioning grooves extending along the radial direction of the inner layer are provided on the support members; The plurality of heating wires are arranged at intervals along the axial direction of the inner layer, and a positioning portion which can be accommodated in the positioning groove is formed on the heating wire.

9. The over-temperature protection structure according to claim 8, characterized in that: A first escape space for accommodating the first over-temperature protection component is formed on the heating wire.

10. The over-temperature protection structure according to claim 9, characterized in that: A second escape space for accommodating the second over-temperature protection component is formed on the heating wire.

11. The over-temperature protection structure according to claim 10, characterized in that: At least one of the support members is disposed between the first avoidance space and the second avoidance space in the circumferential direction of the inner layer, and at least one of the positioning portions is disposed between the first avoidance space and the second avoidance space on the heating wire.

12. The over-temperature protection structure according to any one of claims 1 to 11, characterized in that: The heater also includes an outer layer, and the heating element is located between the inner layer and the outer layer.

13. A hair drying device, characterized in that: It comprises the over-temperature protection structure as described in any one of claims 1 to 12.

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