CN209331292U - Overheat protector structure and trichoxerosis device - Google Patents

Abstract

The utility model belongs to the technical field of hand-held appliances, in particular 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 inside the heating element and is used to support the heating element. The first over-temperature protection member is provided with on the inside 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 part arranged outside the heater, the first over-temperature protection part of the hair dryer is arranged inside the heater, so that the temperature standard for cutting off the power supply of the first over-temperature protection part is the temperature standard of the heater. The internal temperature can reflect the temperature of the heater more intuitively, so as to improve the safety performance and usability of the hair drying device.

Description

Over-temperature protection structure and hair drying device

technical field

The utility model belongs to the technical field of hand-held appliances, in particular to an over-temperature protection structure and a hair drying device.

Background technique

The hair drying device is mostly used for drying and shaping the hair, and can also be used for drying and art in other aspects. Existing hair drying devices generally rely on the motor to drive the fan to rotate. When the fan rotates, air can enter from the fluid inlet and then blow out from the fluid outlet to form fluid, so as to achieve the purposes of drying and shaping.

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. When the fluid heated by the heater flows out, the temperature of the parts around the heater will increase 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.

Utility model content

The technical problem to be solved by the utility model is to provide an over-temperature protection structure and a hair drying device in view of the technical defect of the existing hair dryer that the temperature of the heater is too high which may cause damage to the surrounding components.

In order to solve the above technical problems, on the one hand, an embodiment of the utility model provides an over-temperature protection structure for a hair drying device, including a body, a heater, and a first over-temperature protection member, and a fluid channel is formed in the body , the heater is arranged in the fluid channel and used to heat the fluid medium in the fluid channel;

The heater includes an inner layer and a heating element, 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 on the inner side of the heating element.

Optionally, the inner layer is a plastic layer, and a first through hole is opened on the inner layer, and the first over-temperature protection member is disposed in the first through hole.

Optionally, a first mounting post is provided on the outer wall of the inner layer, and the first over-temperature protection member includes a first temperature measuring portion and a first connecting portion connected to the first temperature measuring portion, the The first temperature measuring part is disposed in the first through hole, and the first connecting part is connected to the first mounting column.

Optionally, the over-temperature protection structure further includes a second over-temperature protection piece, and the second over-temperature protection piece is arranged inside the heating element.

Optionally, 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 When the temperature inside the heater is above a second preset value, the connection between the heater and the power supply is cut off, and when the temperature inside the heater is lower than the second preset value, the connection between the heater and the power supply is restored. connection to the power supply;

The second preset value is smaller than the first preset value.

Optionally, a second through hole is opened on the inner layer, and the second over-temperature protection member is disposed in the second through hole.

Optionally, a second installation column is provided on the outer wall of the inner layer, and the second over-temperature protection member includes a second temperature measuring part and a second connecting part connected to the second temperature measuring part, so The second temperature measuring part is disposed in the second through hole, and the first connecting part is connected to the second mounting column.

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

Optionally, the inner layer is a cylinder, there are a plurality of support members, the heating element includes a plurality of heating wires, and the plurality of support members are arranged at intervals along the circumference of the inner layer, the The supporting member extends axially along the inner layer, and the supporting member is provided with a plurality of positioning grooves extending radially along the inner layer;

A plurality of heating wires are arranged at intervals along the axial direction of the inner layer, and a positioning portion that can be accommodated in the positioning groove is formed on the heating wires.

Optionally, a first avoidance space for accommodating the first over-temperature protection member is formed on the heating wire.

Optionally, a second avoidance space for accommodating the second over-temperature protection member is formed on the heating wire.

Optionally, at least one support member is provided between the first avoidance space and the second avoidance space in the circumferential direction of the inner layer, and the heating wire is located between the first avoidance space and the second avoidance space. At least one positioning portion is disposed between the second avoidance spaces.

Optionally, the heater further includes an outer layer, and the heating element is located between the inner layer and the outer layer.

In the over-temperature protection structure of the hair drying device provided in the above embodiment, the first over-temperature protection member is arranged in the heater, so that when the temperature of the heater is high, the heater is disconnected from the power supply, The heater stops working, 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 part of the hair drying device is arranged in the heater, so that the temperature standard for cutting off the power supply of the first over-temperature protection part is the temperature inside the heater, which can more intuitively reflect the heating The temperature of the hair drying device can be improved to improve the safety performance and usability of the hair drying device.

On the other hand, another embodiment of the present invention also provides a hair drying device, including the above-mentioned over-temperature protection structure.

Description of drawings

Fig. 1 is a schematic structural view of a hair drying device provided by an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of a hair drying device provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of the heater of the hair drying device provided by an embodiment of the present invention;

Fig. 4 is a side view of Fig. 3;

Fig. 5 is a schematic diagram of the structure of the hair drying device provided by an embodiment of the present invention, the heater of which removes the outer layer;

Fig. 6 is a side view of Fig. 5;

Fig. 7 is a schematic structural view of the inner layer of the hair drying device provided by an embodiment of the present invention.

The reference signs in the instructions are as follows:

10. Hair drying device;

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

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, shell body; 240, pipe body;

300. Fan assembly;

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

500. The first over-temperature protection part; 510. The first temperature measuring part; 520. The first connecting part;

600, the second over-temperature protection part; 610, the second temperature measuring part; 620, the second connecting part;

700. Temperature detector.

Detailed ways

In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. Preferred embodiments of the utility model are provided in the accompanying drawings. However, the invention may be embodied 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 utility model more thorough and comprehensive.

As shown in FIGS. 1 and 2 , 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 communicates with the first fluid outlet 222 to form the first fluid channel 101 . The first fluid inlet 112 and the first fluid outlet 222 are respectively used to allow fluid to flow into and out of the first fluid channel 101 .

As shown in FIG. 1 and FIG. 2 , in an embodiment, the handle 100 includes a first end 110 and a second end 120 disposed opposite to each other. 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 portion 200 includes oppositely disposed first end portions 210 and second end portions 220 . The first fluid outlet 222 is disposed at the second end 220 of the body 200 .

Further, in this embodiment, the first fluid channel 101 is non-linear. The first fluid channel 101 includes a first section 103 and a second section 105 which are in communication. The extending direction of the first segment 103 is perpendicular to the extending direction of the second segment 105 . The first section 103 is located within the handle 100 . The second section 105 is located within the body 200 . That is, fluid flows through the handle 100 along the first section 103 of the first fluid channel 101 and through the body 200 along the second section 105 of the first fluid channel 101 .

As shown in FIGS. 1 and 2 , in an embodiment, the hair drying device 10 further includes 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 within 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 .

As shown in FIG. 2 , in one embodiment, the body 200 also has a second fluid inlet 212 and a second fluid outlet 224 . The second fluid inlet 212 communicates with the second fluid outlet 224 to form the second fluid channel 201 . The second fluid inlet 212 and the second fluid outlet 224 are respectively used for another fluid to flow into and out of the second fluid channel 201 . In this embodiment, the second fluid inlet 212 is disposed at the first end 210 of the body 200 . The second fluid outlet 224 is disposed at the second end 220 of the body 200 .

When the fan assembly 300 is in operation, the fan assembly 300 draws fluid through the first fluid inlet 112 into the first fluid channel 101 and to the first fluid outlet 222 , flows through the body 200 and out from the first fluid outlet 222 The action of the outflowing fluid causes another fluid to be entrained or drawn into the second fluid channel 201 at the second fluid inlet 212 and flow along the second fluid channel 201 toward the second fluid outlet 224 . The other fluid flowing out through the second fluid outlet 224 merges with the fluid flowing out through the first fluid outlet 222 at the second end 220 of the body 200 , so that the outflow of fluid from the hair drying device 10 is enhanced.

As shown in FIG. 2 , in one embodiment, the body portion 200 includes a casing 230 and a tube body 240 passing through the casing 230 . The second fluid channel 201 is defined by the tube body 240 . The second fluid channel 201 extends within the tube body 240 from the second fluid inlet 212 to the second fluid outlet 224 . The second section 105 of the first fluid channel 101 is defined by the gap between the tube body 240 and the side walls of the housing 230 . The cross section of the first fluid outlet 222 has a ring shape. The first fluid outlet 222 extends around the second fluid channel 201 .

As shown in FIG. 2 , in one embodiment, the hair drying device 10 further includes a heater 400 . The heater 400 is disposed in the first fluid channel 101 . In this embodiment, the heater 400 is located within the second segment 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 .

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 selectively heats the fluid in the first fluid channel 101 directly. In addition, another fluid flowing through the second fluid channel 201 can also be indirectly heated by the heater 400 .

The over-temperature protection structure of this embodiment includes the first over-temperature protection member 500, the above-mentioned body portion 200 and the heater 400, the first over-temperature protection member 500 is arranged in the heater 400, and the first over-temperature protection member 500 is used for When the temperature inside the heater 400 is above a first preset value, the heater 400 is disconnected from the power supply.

In the over-temperature protection structure of the hair drying device 10 provided in the above embodiments, 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 Stop working, avoiding damage to the heater 400 and surrounding components 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 is used to improve the safety performance and usability of the hair drying device 10 .

The fluid channel of the overtemperature protection structure in this embodiment is the second section 105 formed in the body 200 of the first fluid channel 101 .

As shown in Figure 3, the heater 400 includes an inner layer 410, an outer layer 420 and a heating element 430, the heating element 430 is arranged between the inner layer 410 and the outer layer 420, the inner layer 410 is located inside the heating element 430 and is used for supporting Heating element 430 .

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

As shown in FIG. 7 , the inner layer 410 is provided with a first installation hole 4102 penetrating through the wall of the inner layer 410 , and the first overtemperature protection member 500 includes a first temperature measuring part 510 and a The first connecting portion 520, the outer wall of the inner layer 410 is provided with a first mounting column 4104, the number of the first connecting portion 520 and the first mounting column 4104 are two, and the two first connecting portions 520 are respectively connected to the first At both ends of the temperature measuring part 510 , the first connecting part 520 is fixed on the corresponding first mounting column 4104 , so that the first temperature measuring part 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 inside 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 inside the inner layer 410. When the hair drying device 10 of the above-mentioned embodiment is in use, it can more intuitively reflect the temperature of the heater 400, so as to increase the temperature of the inner layer 410. The safety performance and usability of the hair dryer 10.

As shown in FIG. 2 , FIG. 3 and FIG. 7 , the over-temperature protection structure further includes a second over-temperature protection component 600 , and the second over-temperature protection component 600 is disposed in the heater 400 . Wherein, 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 the second preset value, and to cut off the connection between the heater 400 and the power supply when the temperature in the heater 400 is lower than the second preset value. The connection between the heater 400 and the power supply is restored, and the second preset value is smaller than the first preset value.

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 may be a temperature switch, a metal shrapnel and other components.

As shown in Fig. 2, Fig. 3 and Fig. 7, the second over-temperature protection part 600 is arranged on the outer wall of the inner layer 410, wherein, the second over-temperature protection part 600 includes a second temperature measuring part 610 and is connected to the second temperature measuring part 610. The second connection part 620 on the temperature part 610, the outer wall of the inner layer 410 is provided with a second installation column 4106, the number of the second connection part 620 and the second installation column 4106 are two, and the two second connection parts 620 The two ends of the second temperature measuring part 610 are respectively connected, and the second connecting part 620 is fixed on the corresponding second mounting column 4106 , wherein the second temperature measuring part 610 is exposed on the outer wall of the inner layer 410 . At this time, the temperature standard for disconnecting or connecting the heater 400 and the power supply by the second over-temperature protection member 600 is the temperature between the inner layer 410 and the heating element 430 .

However, in other embodiments, the second over-temperature protection member 600 can also be set similarly to the first over-temperature protection member 500, that is, the outer wall of the inner layer 410 is provided with a second installation hole, and the second over-temperature protection member The second temperature measuring part 610 of 600 is suspended in the second installation hole. At this time, the temperature standard for disconnecting or connecting the heater 400 and the power supply of the second overtemperature protection member 600 is the temperature in the inner layer 410 .

It can also be that the first temperature measuring part 510 of the first over-temperature protection part 500 is exposed on the outer wall of the inner layer 410. At this time, the temperature standard for the first over-temperature protection part 500 to disconnect the heater 400 and the power supply is to be located at the heating The temperature between the element 430 and the inner layer 410. Wherein, the specific installation methods of the first over-temperature protection part 500 and the second over-temperature protection part 600 are not limited to each other, that is, the specific installation method of the first over-temperature protection part 500 and the specific installation method of the second over-temperature protection part 600 The methods can be the same or different.

Specifically, in this embodiment, the inner layer 410 is made of plastic material. Compared with the traditional mica material, the plastic material has better plasticity and higher hardness, which is conducive to setting the inner layer 410 for supporting the heating element 430 into other shapes and relatively fixed, and is conducive to setting up the inner layer 410. The first installation hole 4102 and the second installation hole realize the installation and fixation of the first over-temperature protection member 500 and the second over-temperature protection member 600 in the heater 400 , and greatly improve the bearing adaptability of the heater 400 . The outer layer 420 is made of insulating material, preferably, the outer layer 420 is made of mica.

The first over-temperature protection element 500 and the second over-temperature protection element 600 are not affected by the fluid medium in the first fluid channel 101 during 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, when the temperature in the heater 400 is greater than or equal to the second preset value, the second overtemperature The protection member 600 disconnects the connection between the heater 400 and the power supply. When the blockage and abnormal heating are eliminated, so that the temperature in the heater 400 is lower than the second preset value, the second over-temperature protection member 600 restores the connection between the heater 400 and the power supply. Connected, the hair dryer 10 resumes use.

When the second over-temperature protection member 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, the first over-temperature protection member 500 makes the connection between the heater 400 and the power supply The connection is broken, thereby protecting the heater 400 and components located around the heater 400 .

In this embodiment, the heater 400 is connected to a controller, and the controller is located in the first fluid passage 101, and the first temperature measuring part 510 of the first overtemperature protection member 500 is connected to the controller through the first connecting part 520 and wires. connection, the second temperature measuring part 610 of the second over-temperature protection element 600 is connected to the controller through the second connecting part 620 and wires. Specifically, both the first over-temperature protection element 500 and the second over-temperature protection element 600 are arranged on the connection path between the heater 400 and the controller, and the power supply is supplied to the heater 400 through the controller, so that the first over-temperature protection element 500 may disconnect or restore the heater 400 from the power source, and the second over-temperature protector 600 may disconnect or restore the heater 400 from the power source.

In the embodiment shown in FIGS. 3 to 7 , 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 .

As shown in FIG. 7 , a support 4108 is provided on the outer wall of the inner layer 410 , and the heating element 430 is erected on the support 4108 . Wherein, the heating element 430 includes a plurality of heating wires, and the number of support members 4108 is multiple, and the heating wires are erected on the support members 4108 in a one-to-one correspondence.

Specifically, the inner layer 410 and the outer layer 420 are cylindrical, and a plurality of support members 4108 are arranged at intervals along the circumference of the inner layer 410, and the support members 4108 extend along the axial direction of the inner layer 410. The inner layer 410 has a plurality of positioning grooves 41082 extending radially, and a plurality of heating wires are arranged at intervals along the axial direction of the inner layer 410 , and the heating wires are formed with positioning portions 4302 that can be accommodated in the positioning grooves 41082 .

As shown in FIG. 4 and FIG. 6 , a first escape space 4304 for accommodating the first over-temperature protection element 500 and a second escape space 4306 for accommodating the second over-temperature protection element 600 are formed on the heating wire. Specifically, the first avoidance space 4304 is a first U-shaped structure in which the opening formed on the heating wire faces the inner layer 410, and the second avoidance space 4306 is a second U-shaped structure in which the opening formed on the heating wire faces the inner layer 410. An 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.

However, in other embodiments, the first avoidance space 4304 can also be a semicircular or semi-elliptical structure with openings formed on the heating wire facing the inner layer 410. Similarly, the second avoidance space 4306 can also be a The formed opening faces the semicircular or semielliptical structure of the inner layer 410 . Wherein, the specific implementation manners of the first avoidance space 4304 and the second avoidance space 4306 may be the same or different.

As shown in Figure 7, at least one support 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 the heating wire is located between the first U-shaped structure and the second U-shaped structure. At least one positioning part 4302 is provided between the structures. That is, the first U-shaped structure and the second U-shaped structure can be arranged adjacently or at intervals. When the first U-shaped structure and the second U-shaped structure are adjacently arranged, the first U-shaped structure and the second U-shaped structure A supporting frame is arranged between the structures 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 disposed between the first avoidance space 4304 and the second avoidance space 4306 in the circumferential direction of the inner layer 410 .

The above examples only express several implementations of the utility model, and the description thereof is more specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (14)

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, a fluid channel is formed in the body, and the heater is arranged on the within a fluid channel and for heating a fluid medium within said fluid channel; The heater includes an inner layer and a heating element, 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 on the inner side of the heating element. 2. The over-temperature protection structure according to claim 1, wherein the inner layer is a plastic layer, and a first through hole is opened on the inner layer, and the first over-temperature protection member is arranged on the inside the first through hole. 3. The over-temperature protection structure according to claim 2, characterized in that, the outer wall of the inner layer is provided with a first mounting column, and the first over-temperature protection part includes a first temperature measuring part and a There is a first connecting part on 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. 4. The over-temperature protection structure according to claim 3, characterized in that, the over-temperature protection structure further comprises a second over-temperature protection member, and the second over-temperature protection member is arranged inside the heating element. 5. The over-temperature protection structure according to claim 4, wherein the first over-temperature protection member is used to cut off the heater from the heater when the temperature inside the heater is above a first preset value. The connection of the power supply, 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 the temperature inside the heater is less than recovering the connection between the heater and the power supply at a second preset value; The second preset value is smaller than the first preset value. 6 . The over-temperature protection structure according to claim 5 , wherein a second through hole is opened on the inner layer, and the second over-temperature protection member is arranged in the second through hole. 7. The over-temperature protection structure according to claim 6, characterized in that, the outer wall of the inner layer is provided with a second mounting column, and the second over-temperature protection part includes a second temperature measuring part and is connected to the The second connecting part on 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. 8 . The over-temperature protection structure according to claim 4 , wherein a support is provided on the outer wall of the inner layer, and the heating element is erected on the support. 9. The over-temperature protection structure according to claim 8, wherein the inner layer is a cylinder, there are multiple supports, the heating element includes multiple heating wires, and multiple supports Arranged at intervals along the circumference of the inner layer, the support extends along the axial direction of the inner layer, and the support is provided with a plurality of positioning grooves extending radially along the inner layer; A plurality of heating wires are arranged at intervals along the axial direction of the inner layer, and a positioning portion that can be accommodated in the positioning groove is formed on the heating wires. 10 . The over-temperature protection structure according to claim 9 , wherein a first avoidance space for accommodating the first over-temperature protection member is formed on the heating wire. 11 . 11. The over-temperature protection structure according to claim 10, characterized in that a second avoidance space for accommodating the second over-temperature protection member is formed on the heating wire. 12. The over-temperature protection structure according to claim 11, characterized in that at least one support is provided between the first escape space and the second escape space in the circumferential direction of the inner layer. The heating wire is provided with at least one positioning part between the first avoidance space and the second avoidance space. 13. The over-temperature protection structure according to any one of claims 1-12, wherein the heater further comprises an outer layer, and the heating element is located between the inner layer and the outer layer. 14. A hair drying device, characterized in that it comprises the over-temperature protection structure according to any one of claims 1-13.