Heaters and hair dryers

Abstract

The present invention provides a heater and a hair dryer. The heater comprises an outer tube and a support member disposed within the outer tube. Multiple layers of heating wire are disposed between the outer tube and the support member to enhance heating efficiency. A heat-insulating layer is disposed between the outer tube and the support member to reduce the outward diffusion of heat generated by the heating wire, thereby helping to reduce heat loss. Furthermore, a sealing cap is disposed at at least one end of the support member to reduce the diffusion of heat generated by the heating wire into the air, further helping to reduce heat loss.

Description

Technical Field

[0001] The present application relates to the field of mechanical technology, and in particular to a heater and a hair dryer. Background Art

[0002] As people's living standards continue to improve, various household appliances have entered their lives. For example, hair dryers can quickly dry hair and create hairstyles. The principle of hair dryers' ability to dry hair lies in the fact that they are equipped with a fan and a heater. The fan sends air from the air inlet to the heater, which heats the air and then exhausts it from the air outlet, allowing the hair dryer to blow hot air.

[0003] In existing technologies, the heat loss generated by the heater is large, resulting in a poor user experience. Summary of the Invention

[0004] Various aspects of the present application provide a heater and a hair dryer to reduce heat loss of the heater, thereby improving heat energy conversion efficiency.

[0005] An embodiment of the present application provides a heater, comprising: an outer tube and a support member arranged in the outer tube; a sealing cover is provided at at least one end of the support member; multiple layers of heating wires are provided between the outer tube and the support member, and gaps are provided between the multiple layers of heating wires; and a heat insulation layer is also provided between the outer tube and the support member.

[0006] The embodiment of the present application further provides a heater, comprising: an outer cylinder and a support member disposed in the outer cylinder; at least one layer of heating wire is disposed between the outer cylinder and the support member;

[0007] The heater further includes: a first temperature protection circuit, a second temperature protection circuit, and a control system; the first temperature protection circuit is electrically connected to the control system, and the first temperature protection circuit is used to collect the temperature of the at least one layer of heating wire, provide the temperature of the at least one layer of heating wire to the control system, and control the connection between the at least one layer of heating wire and the power supply;

[0008] The control system is configured to control the connection state between the at least one layer of heating wire and the power supply through the first temperature protection circuit according to the temperature of the at least one layer of heating wire;

[0009] The second temperature protection circuit is connected in series to both ends of the at least one layer of heating wire, and can cut off the circuit where the at least one layer of heating wire is located when the temperature of the at least one layer of heating wire is greater than or equal to the target temperature.

[0010] An embodiment of the present application also provides a hair dryer, comprising: a body shell; a fan assembly and a heater are arranged in the body shell; the heater comprises: an outer cylinder and a support member arranged in the outer cylinder; a sealing cover is provided at at least one end of the support member; multiple layers of heating wires are arranged between the outer cylinder and the support member, and there are gaps between the multiple layers of heating wires; and an insulation layer is also provided between the outer cylinder and the support member.

[0011] The present application also provides a hair dryer, comprising: a body shell; a heater and a control system disposed within the body shell; the heater comprising: an outer cylinder and a support member disposed within the outer cylinder; at least one layer of heating wire disposed between the outer cylinder and the support member;

[0012] The heater further includes: a first temperature protection circuit and a second temperature protection circuit; the first temperature protection circuit is electrically connected to the control system, and the first temperature protection circuit is used to collect the temperature of the at least one layer of heating wire, provide the temperature of the at least one layer of heating wire to the control system, and control the connection between the at least one layer of heating wire and the power supply;

[0013] The control system is configured to control the connection state between the at least one layer of heating wire and the power supply through the first temperature protection circuit according to the temperature of the at least one layer of heating wire;

[0014] The second temperature protection circuit is connected in series to both ends of the at least one layer of heating wire, and can cut off the circuit where the at least one layer of heating wire is located when the temperature of the at least one layer of heating wire is greater than or equal to the target temperature.

[0015] In an embodiment of the present application, the heater includes an outer tube and a support member arranged in the outer tube. Multiple layers of heating wires are arranged between the outer tube and the support member to improve the heating effect, and a heat insulation layer is arranged between the outer tube and the support member. The heat insulation layer can reduce the outward diffusion of heat generated by the heating wire, thereby helping to reduce heat loss; on the other hand, a sealing cover is also provided at at least one end of the support member, which can reduce the diffusion of heat generated by the heating wire into the air, thereby helping to further reduce heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1a and Figure 1b A schematic structural diagram of a heater provided in an embodiment of the present application;

[0018] Figure 1cA schematic diagram of the structure of the inner cylinder provided in an embodiment of the present application;

[0019] Figure 1d A schematic diagram of the structure of the wing provided in an embodiment of the present application;

[0020] Figure 1e A schematic diagram of the flattened structure of the heating wire provided in an embodiment of the present application;

[0021] Figure 1f A schematic diagram of the positional relationship between the heating wire, support member, and outer cylinder provided in an embodiment of the present application;

[0022] Figure 1g and Figure 1h A schematic structural diagram of another heater provided in an embodiment of the present application;

[0023] Figure 1i A schematic structural diagram of a second temperature protection circuit provided in an embodiment of the present application;

[0024] Figure 2a and Figure 2b A schematic diagram of the structure of a hair dryer provided in an embodiment of the present application;

[0025] Figure 3a-3c A schematic structural diagram of another heater provided in an embodiment of the present application;

[0026] Figure 4 A schematic structural diagram of another hair dryer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] In response to the technical problem of large heat loss in existing heating wires, some embodiments of the present application provide a heater, which includes an outer tube and a support member arranged in the outer tube. Multiple layers of heating wires are arranged between the outer tube and the support member to improve the heating effect, and a heat insulation layer is arranged between the outer tube and the support member. The heat insulation layer can reduce the outward diffusion of heat generated by the heating wire, thereby helping to reduce heat loss; on the other hand, a sealing cover is also provided at at least one end of the support member, which can reduce the diffusion of heat generated by the heating wire into the air, thereby helping to further reduce heat loss.

[0029] The following describes in detail the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0030] It should be noted that the same reference numerals denote the same objects in the following drawings and embodiments, and therefore, once an object is defined in one drawing or embodiment, it does not need to be further discussed in the subsequent drawings and embodiments.

[0031] Figure 1a and Figure 1b This is a schematic diagram of the structure of the heater provided in the embodiment of the present application. Figure 1a and Figure 1b As shown, the heater includes an outer tube 11 and a support member 12 disposed within the outer tube 11. In this embodiment, multiple layers of heating wires 13 are disposed between the outer tube 11 and the support member 12, with gaps between the multiple layers of heating wires 13. Multiple layers refers to two or more layers. Figure 1a and Figure 1b Only two layers of heating wires are shown in the figure, which does not constitute a limitation. In this embodiment, the gaps between the multiple layers of heating wires 13 refer to gaps between the multiple layers of heating wires 13 in the radial direction of the support member 12. The size of the gaps can be determined by the specifications of the heating wires 13.

[0032] Further, if Figure 1b As shown, a heat insulation layer 14 is further provided between the outer cylinder 11 and the support member 12. In the present embodiment, the composition of the heat insulation layer 14 is not limited. Alternatively, the heat insulation layer 14 may be a glass fiber layer, an asbestos layer, a rock wool layer, a silicate layer, an aerogel felt layer, or a mica layer, but is not limited thereto.

[0033] Furthermore, in order to prevent the heat generated by the multi-layer heating wire 13 from diffusing into the air, Figure 1a and Figure 1b As shown, at least one end of the support member 11 is provided with a sealing cover 15. Preferably, both ends of the support member 11 are provided with a sealing cover 15.

[0034] The heater provided in this embodiment includes multiple layers of heating wire, which generate a high amount of heat. Therefore, in this embodiment, not only is an insulation layer provided between the outer tube and the support member, but a sealing cap is also provided on at least one end of the support member. The insulation layer prevents heat generated by the heating wire from dissipating outward, helping to reduce heat loss. Furthermore, the sealing cap is provided on at least one end of the support member to prevent heat generated by the heating wire from dissipating into the air, further helping to reduce heat loss.

[0035] In this embodiment, the heat insulation layer 14 can be provided on the outer wall of the support member 12 or on the inner wall of the outer cylinder 11 ; alternatively, the heat insulation layer 14 can be provided on the outer wall of the support member 12 and the inner wall of the outer cylinder 11 .

[0036] Further, if Figure 1a and Figure 1b As shown, the support member may include an inner cylinder 12a and multiple fins 12b disposed on the inner cylinder 12a at varying heights. In the present embodiment, the inner cylinder 12a can be implemented in a variety of ways, such as a tubular structure, an annular bracket, or a columnar structure. Depending on the form of the inner cylinder 12a, the placement of the multi-layer heating wire 13 is adjusted accordingly.

[0037] In this embodiment, each layer of heating wire 13 is wound around a portion of the fins 12b of the same height. That is, one end of the fin 12b is connected to the inner cylinder 12a, and the other end is used to provide support for the heating wire 13. For example, Figure 1a and Figure 1b As shown, the heating wire 13 includes: a first layer of heating wire 13a and a second layer of heating wire 13b, wherein the first layer of heating wire 13a is wound around a plurality of first fins 12b1 having a first height, and the second layer of heating wire 13b is wound around a plurality of second fins 12b2 having a second height, wherein the first height is greater than the second height.

[0038] In the embodiments of the present application, the specific number of fins at each height is not limited, and the number of fins at each height can be the same or different. Optionally, the number of fins at the same height is an even number. In this embodiment, the specific material of the fins is not limited. Optionally, the fins can be mica fins, fiberglass fins, asbestos fins, rock wool fins, silicate fins, or aerogel felt fins, among others, but are not limited thereto.

[0039] The arrangement of the plurality of fins 12b on the inner cylinder 12a can be such that fins of different heights are alternately arranged around the inner cylinder 12a. Figure 1a and Figure 1b As shown, the first fins 12b1 and the second fins 12b2 are alternately arranged around the inner cylinder 12a.

[0040] In the embodiment of the present application, the inner cylinder 12a and the plurality of fins 12b can be an integrally formed structure or a separate structure. When the inner cylinder 12a and the plurality of fins 12b are a separate structure, further, in order to ensure the firmness of the connection between the inner cylinder 12a and the fins 12b, as shown in FIG. Figure 1c As shown, the inner cylinder 12a is provided with a plug-in slot 12a1 for plugging in a plurality of fins 12b. The plug-in slot 12a1 can make the connection between the inner cylinder 12a and the plurality of fins 12b more secure, and can make the plurality of fins 12b detachably connected, so that the inner cylinder 12a is suitable for fins of different specifications.

[0041] Furthermore, in order to make the connection between the support member and the heating layer more secure, Figure 1dAs shown, each wing can be provided with multiple fixing grooves at one end away from the inner cylinder 12a, and the heating wire 13 is fixed in the fixing grooves. The fixing grooves are evenly arranged along the length of the wing 12b, and each fixing groove holds a turn of the heating wire. The number of fixing grooves is not limited. Figure 1d Only a single wing is shown. Optionally, a through port 12c (such as Figure 1d As shown), the inner layer heating wire can be wound around the corresponding fin through the through port 12c. Among them, the second layer heating wire 13b passes through the through port 12c and is wound around the second fin 12b2 (as shown). Figure 1d As shown). Figure 1b In the figure, only two layers of heating wires are shown as an example.

[0042] In other embodiments, Figure 1b As shown, at least one end of the inner cylinder 12a is provided with a sealing cover 15. Optionally, the sealing cover 15 and the inner cylinder 12a can be an integrally formed structure or a separate structure.

[0043] Furthermore, one end of the inner cylinder 12a is provided with a sealing cover, and the other end is open. Wherein, the inner cylinder 12a can be a hollow truncated cone structure, and the sealing cover 15 is provided on the small end surface of the truncated cone structure.

[0044] Furthermore, for the inner tube 12a having a sealing cover 15 at one end and an opening at the other end, one end of the plurality of fins is fixed to the sealing cover 15 and the other end is fixed to the opening of the inner tube.

[0045] In the embodiment of the present application, in order to increase the contact area between the heating wire 13 and the air in a limited space, increase the heating area, and thus increase the heat, the heating wire can be a wavy structure or a spiral structure. Figure 1b The heating wire is shown as a wavy structure. The heating wire can be a metal wire, such as iron chromium.

[0046] Furthermore, considering that the heating wire is a metal wire, its rigidity also has certain limits. If the diameter of the heating wire is small and the wave height is too high, it is easy to be blown down by the high-speed airflow, causing the heating wire to deform. In the case where the heating wire 13 has a wavy structure, optionally, the wave height of the heating wire can be greater than or equal to 3.5 mm and less than or equal to 7 mm, but is not limited to this. Optionally, the diameter of the heating wire can be greater than or equal to 0.35 mm and less than or equal to 0.45 mm, but is not limited to this. The wave height and diameter of the heating wire given here are for exemplary purposes only.

[0047] Optionally, the wave height and wave pitch of multiple layers of heating wires can be the same, or the wave height and wave pitch of multiple layers of heating wires can be different, or the wave height and wave pitch of multiple layers of heating wires can be the same, but the wave pitch can be different; or the wave pitch of multiple layers of heating wires can be the same, but the wave height can be different; or the wave height and / or wave pitch of several layers (or some layers) of heating wires can be the same. It is worth noting that the wave pitch of the heating wire refers to the distance between two adjacent wave crests or wave troughs of the wavy heating wire before it is wrapped around the fin.

[0048] In an optional embodiment, the number of layers of heating wire is 2, such as Figure 1b As shown, the first layer of heating wire 13a and the second layer of heating wire 13b. The diameter of the first layer of heating wire is larger than the diameter of the second layer of heating wire. The diameter of the heating wire is the diameter of the circle or quasi-circle formed by the heating wire wound on the fin. Optionally, the length of the first layer of heating wire is greater than or equal to the length of the second layer of heating wire. The length of the heating wire refers to the total length of the metal wire used for the heating wire. For example, Figure 1e As shown, the wave heights of the first layer of heating wires and the second layer of heating wires are h1 and h2 respectively, the wave widths are w1 and w2 respectively, and the number of wave peaks are n1 and n2 respectively. Then, the length L1 of the first layer of heating wires is L1 = 2*n1*h1 + (2*n1-1)*w1; correspondingly, the length L1 of the first layer of heating wires is L1 = 2*n2*h2 + (2*n2-1)*w2.

[0049] Furthermore, the wave height and wave pitch of the first layer of heating wires are respectively the same as the wave height and wave pitch of the second layer of heating wires. Of course, the wave height and wave pitch of the first layer of heating wires can also be different from the wave height and wave pitch of the second layer of heating wires; or the wave height of the first layer of heating wires and the wave height of the second layer of heating wires are the same, but the wave pitch of the two layers is different; or the wave pitch of the first layer of heating wires and the wave pitch of the second layer of heating wires are the same, but the wave height of the two layers is different.

[0050] The heater provided in the embodiments of this application can be used in a variety of devices, such as hair dryers, hand dryers, and clothes dryers. The size relationship between the heater's inner and outer cylinders varies depending on the device in which the heater is deployed. The following describes the size relationship between the heater's inner and outer cylinders using the example of a hair dryer.

[0051] The operating power of the heating wire 13 is related to its length and wire diameter. The longer the length of the heating wire 13 and the smaller its wire diameter, the greater its resistance and the lower its heating power. The length of the heating wire 13 is constrained by the length and diameter of the outer cylinder; the wave height is related to wind resistance and the distance between the inner wall of the outer cylinder and the support member. Taking these factors into consideration, in an optional embodiment, the outer cylinder diameter can be set to be larger than the inner cylinder diameter, but less than or equal to three times the inner cylinder diameter. This multiple relationship between the outer and inner cylinder diameters is a preferred implementation method, but is not limited to this.

[0052] Furthermore, in the case where the multi-layer heating wire is two layers, the outer cylinder diameter can be set to be larger than the inner cylinder diameter and smaller than twice the inner cylinder diameter.

[0053] Optionally, when the multi-layer heating wire is three layers, the diameter of the outer cylinder can be set to be greater than twice the diameter of the inner cylinder and less than three times the diameter of the inner cylinder.

[0054] In addition to considering the multiple relationship between the outer cylinder diameter and the inner cylinder diameter, the embodiments of the present application also provide exemplary descriptions of the numerical values ​​of the outer cylinder diameter and the inner cylinder diameter. Optionally, the outer cylinder diameter is greater than or equal to 40 mm and less than or equal to 80 mm. Optionally, the inner cylinder diameter is greater than or equal to 20 mm and less than or equal to 40 mm.

[0055] Furthermore, in addition to considering the relationship between the inner and outer cylinders from the perspective of a multiple of their diameters, the relationship between the inner and outer cylinders can also be described in terms of the spacing between them. Optionally, the spacing between the inner and outer cylinders can be greater than or equal to 20 mm and less than or equal to 60 mm, but this is not limited to this. Furthermore, the spacing between the inner and outer cylinders can be greater than or equal to 20 mm and less than or equal to 30 mm. The spacing ranges between the inner and outer cylinders given here are for illustrative purposes only and do not constitute limitations on the scope of protection of this application.

[0056] In some embodiments, the size relationship between the inner and outer tubes can also be determined based on the specifications of the heating wire. The following is an example of a two-layer heating wire. In this embodiment, the specifications of the first and second layers of heating wires are the same, and the first and second layers of heating wires are connected in parallel. Assuming that the lengths of the first and second layers of heating wires are both L and the wire diameters are both l, the cross-sectional areas of the first and second layers of heating wires are: Therefore, the resistance of the first layer of heating wire and the second layer of heating wire is: R1 = R2 = ρL / A (2), and the total resistance of the first layer of heating wire and the second layer of heating wire is:

[0057] In this embodiment, if Figure 1f As shown, the safety distance s1 between the first layer of heating wires and the second layer of heating wires is at least 2 mm. The safety distance s2 between the second layer of heating wires and the support member is at least 1 mm, and the safety distance s3 between the first layer of heating wires and the inner wall of the outer cylinder is at least 1 mm. Optionally, s2 can be equal to s3.

[0058] The inner diameter of the outer cylinder is represented by D, and the diameter of the support is represented by d. Then the distance between the inner wall of the outer cylinder and the support is (Dd) / 2=h1+h2+s1+s2+s3=2h+s1+s2+s3(4).

[0059] Since the power of the heating wire P = U*U / R (5), and since the power P and the voltage U are constant, R is also a constant. Therefore, from formulas (3) and (5), we can get: Then we get:

[0060] Furthermore, according to formula (7), we can get:

[0061] Furthermore, the relationship between the length L of the heating wire and the length Z of the outer tube is as follows: Wherein, y is the wave width after winding. Optionally, y ≥ 2 mm.

[0062] Therefore, according to formula (4), (Dd) / 2=h1+h2+s1+s2+s3=2h+s1+s2+s3>2h+4mm. Furthermore, considering the problem of temperature uniformity, in this embodiment, h>s1=2mm; and s1>2s2>2mm, therefore, h<7mm, (Dd) / 2≥2h+4mm>8mm.

[0063] The following example illustrates a heating wire with a heating power of 1400W. Assuming the outer tube length Z is less than 35mm, and the length of the heating wire in the longitudinal direction of one wing after winding is 20mm, then:

[0064] Dd>16mm;

[0065]

[0066] (138l+276)*A / ρ<=20π(d+D), that is, D+d>=(138l+276)*l*l / 0.12.

[0067] Therefore, the wire diameter l of the heating wire ranges from 0.35 mm to 0.55 mm. Therefore, D + d >= 60. That is, the outer cylinder diameter D is at least 60 mm. Furthermore, the inner cylinder diameter d is controlled within 44 mm.

[0068] It is worth noting that the calculation process of the above formula is derived based on theoretical numerical values. In actual use, due to the existence of various errors, the sizes of the inner cylinder diameter and the outer cylinder diameter can be appropriately adjusted.

[0069] In some embodiments, on the one hand, in order to improve the safety of the heater, the temperature of the heating wire is prevented from being too high, which may affect the service life of the heater; on the other hand, in order to improve the user's comfort, the temperature is prevented from being too high, which may affect the user experience. Figure 1g As shown, in the embodiment of the present application, the heater further includes: a first temperature protection circuit 16, a second temperature protection circuit 17 and a control system 18. The first temperature protection circuit 16 is electrically connected to the control system 18.

[0070] In this embodiment, the first temperature protection circuit 16 can collect the temperature of the multi-layer heating wire 13 and provide the temperature of the multi-layer heating wire 13 to the control system, thereby controlling the connection between the multi-layer heating wire 13 and the power supply. The power supply can be a built-in power supply of the heater or an external power supply, such as a 220V mains power supply.

[0071] Accordingly, the control system 18 can control the connection between the multi-layer heating wire 13 and the power supply via the first temperature protection circuit 16 based on the temperature of the multi-layer heating wire. This allows the control system to control the connection between the multi-layer heating wire and the power supply based on the temperature of the heating wire, preventing excessive temperatures from affecting the heater's service life. Furthermore, it can prevent excessive temperatures from affecting the user experience.

[0072] In this embodiment, a second temperature protection circuit 17 is connected in series to the ends of the multilayer heating wire. This circuit disconnects the multilayer heating wire 13 when the temperature of the multilayer heating wire is greater than or equal to the target temperature. The second temperature protection circuit 17 and the first temperature protection circuit 16 serve as backup for each other, further enhancing the safety of the heater. In this embodiment, the ends of the multilayer heating wire serve as the inlet and outlet terminals of the multilayer heating wire. If the multilayer heating wires are connected in parallel, the ends of the multilayer heating wires serve as the ends of the parallel structure formed by the parallel connection; if the multilayer heating wires are connected in series, the ends of the multilayer heating wires serve as the ends of the series structure formed by the series connection. Figure 1e and Figure 1g The figure only illustrates the case where the multi-layer heating wires are 2 layers and the 2 layers of heating wires are connected in parallel, which does not constitute a limitation.

[0073] In this embodiment, if Figure 1h As shown, the first temperature protection circuit 16 includes: a temperature sensor 16a and a switch unit 16b. In the embodiment of the present application, the specific implementation form of the temperature sensor 16a is not limited. Optionally, the temperature sensor 16a can be a thermistor or a thermocouple, etc., but is not limited thereto. The temperature sensor 16a and the switch unit 16b are respectively electrically connected to the control system 18; and the switch unit 16b is connected between the multi-layer heating wire 13 and the power supply. Among them, the temperature sensor 16a can collect the temperature of the multi-layer heating wire 13 and provide the temperature of the multi-layer heating wire 13 to the control system 18.

[0074] Accordingly, the control system 18 is configured to control the operating state of the switch unit 16b, and thereby control the connection state between the heating wire 13 and the power supply, based on the temperature of the heating wire 13. Optionally, the control system 18 may control the switch unit 16b to be disconnected when the temperature of the heating wire 13 is greater than or equal to a predetermined first temperature threshold, thereby disconnecting the heating wire 13 from the power supply. Accordingly, the control system 18 may control the switch unit 16b to be connected when the temperature of the heating wire 13 is less than or equal to a predetermined second temperature threshold, thereby connecting the heating wire 13 to the power supply. The second temperature threshold is lower than the first temperature threshold.

[0075] In this embodiment, the switch unit 16b may be disposed on the PCB board where the control system 18 is located, or may be disposed at other locations within the outer cylinder, which is not limited here.

[0076] In this embodiment, if Figure 1h As shown, the temperature sensor 16a can be installed on the support member. Alternatively, the temperature sensor 16a can be fixed between two adjacent fins; alternatively, it can be fixed between two adjacent fins of the same height. The temperature sensor 16a is close to the heating wire 13 but does not contact it. Furthermore, the leads between the temperature sensor 16a and the control system 18 are distributed along the outer wall of the support member or the inner wall of the outer cylinder; alternatively, the leads can be distributed partially along the outer wall of the support member and partially along the inner wall of the outer cylinder. Alternatively, the leads can be partially installed on the outer wall of the support member and partially installed on the inner wall of the outer cylinder.

[0077] Further, if Figure 1h and Figure 1i As shown, the second temperature protection circuit 17 may include: at least one of a temperature protector 17a and a temperature fuse 17b. When the second temperature protection circuit 17 includes: the temperature protector 17a and the temperature fuse 17b, the temperature protector 17a and the temperature fuse 17b are connected in series, and after being connected in series, they are connected in series with both ends of the multi-layer heating wire 13.

[0078] In this embodiment, the temperature protector 17a can be turned off when the temperature of the multi-layer heating wire 13 is greater than or equal to its operating temperature (defined as the first operating temperature), thereby severing the circuit in which the multi-layer heating wire 13 is located and protecting the heating wire 13. Accordingly, the temperature protector 17a can also be turned on when the temperature of the multi-layer heating wire 13 is lower than its other operating temperature (defined as the second operating temperature), thereby forming a circuit between the temperature protector 17a and the multi-layer heating wire 13. The second operating temperature is lower than the first operating temperature. In other words, the temperature protector 17a can be turned off and restored when the temperature of the heating wire 13 drops to the second operating temperature.

[0079] The thermal fuse 17b can melt when the temperature of the heating wire 13 exceeds its melting temperature, thereby severing the circuit in which the multi-layer heating wire 13 is located. The thermal fuse 17b has a different operating temperature than the first operating temperature. In this embodiment, the melting temperature is higher than the first operating temperature, and the melting of the thermal fuse 17b is irreversible. In another embodiment, the melting temperature is lower than the first operating temperature and higher than the second operating temperature, and the melting of the thermal fuse 17b is reversible.

[0080] Furthermore, the temperature protector 17a and the temperature fuse 17b can be fixed between two adjacent wings; or, they can be fixed between two adjacent wings of the same height, and the series circuit formed by the two is connected in series to both ends of the multi-layer heating wire 13.

[0081] The heater provided in the embodiment of the present application can be applied to various devices that need to heat airflow, such as hair dryers, hand dryers, dryers, etc., but is not limited thereto. The following is an example of applying the heater to a hair dryer.

[0082] Figure 2a and Figure 2b This is a structural diagram of a hair dryer provided in an embodiment of the present application. Figure 2a and Figure 2b As shown, the hair dryer includes: a body shell S10; a heater S11 and a fan assembly S12 are arranged in the body shell S10. The structure of the heater can be seen in FIG. Figure 2a and the above Figure 1b .like Figure 2a and Figure 1b As shown, the heater S19 comprises an outer cylinder 11 and a support member 12 disposed in the outer cylinder 11. In this embodiment, multiple layers of heating wires 13 are disposed between the outer cylinder 11 and the support member 12, with gaps between the multiple layers of heating wires 13.

[0083] Furthermore, in order to prevent the heat generated by the multi-layer heating wire 13 from diffusing into the air, Figure 2a and Figure 1b As shown, a sealing cover 15 is provided at at least one end of the support member 11. Preferably, a sealing cover 15 is provided at both ends of the support member 11. The detailed description of the structure of the heater S11 can be found in the relevant contents of the above embodiment and will not be repeated here.

[0084] The heater in the hair dryer provided in this embodiment includes multiple layers of heating wires, which generate a high amount of heat. Therefore, in this embodiment, not only is an insulation layer provided between the outer cylinder and the support member, but a sealing cap is also provided on at least one end of the support member. The insulation layer prevents heat generated by the heating wires from dissipating outward, helping to reduce heat loss. Furthermore, the sealing cap is provided on at least one end of the support member to prevent heat generated by the heating wires from dissipating into the air, further helping to reduce heat loss.

[0085] In this embodiment, if Figure 2a and Figure 1b As shown, the support member may include an inner cylinder 12a and multiple fins 12b disposed on the inner cylinder 12a at varying heights. In the present embodiment, the inner cylinder 12a can be implemented in a variety of ways, such as a tubular structure, an annular bracket, or a columnar structure. Depending on the form of the inner cylinder 12a, the placement of the multi-layer heating wire 13 is adjusted accordingly.

[0086] Optionally, each layer of heating wire 13 is wound around a portion of the fins 12b with the same height. That is, one end of the fin 12b is connected to the inner cylinder 12a, and the other end is used to provide support for the heating wire 13. For example, Figure 2a and Figure 1b As shown, the heating wire 13 includes a first layer of heating wires 13a and a second layer of heating wires 13b. The first layer of heating wires 13a is wound around a plurality of first fins 12b1 having a first height, while the second layer of heating wires 13b is wound around a plurality of second fins 12b2 having a second height. The first height is greater than the second height. The specific structure and arrangement of the fins can be found in the above-mentioned embodiments and will not be further elaborated here.

[0087] In other embodiments, at least one end of the inner cylinder 12a is provided with a sealing cover 15. Optionally, the sealing cover 15 and the inner cylinder 12a can be an integrally formed structure or a separate structure.

[0088] Furthermore, one end of the inner cylinder 12a is provided with a sealing cover 15, and the other end is open. Wherein, the inner cylinder 12a can be a hollow truncated cone structure, and the sealing cover 15 is provided on the small end surface of the truncated cone structure.

[0089] Alternatively, as Figure 2b As shown, one end of the inner cylinder 12a provided with a sealing cover faces the fan assembly; the open end of the inner cylinder 12a faces the air outlet of the hair dryer, the purpose of which is: on the one hand to prevent the air flow from entering the hollow inner cavity of the inner cylinder 12a; on the other hand to reduce the heat generated by the heating wire 13 from diffusing into the hollow inner cavity.

[0090] In some embodiments, on the one hand, in order to improve the safety of the heater, the temperature of the heating wire is prevented from being too high and affecting the service life of the heater; on the other hand, in order to improve the user's comfort, the temperature is prevented from being too high and affecting the user experience. Figure 1g As shown, in the embodiment of the present application, the heater S11 further includes: a first temperature protection circuit 16, a second temperature protection circuit 17 and a control system 18. The first temperature protection circuit 16 is electrically connected to the control system 18.

[0091] In this embodiment, the first temperature protection circuit 16 can collect the temperature of the multi-layer heating wire 13 and provide the temperature of the multi-layer heating wire 13 to the control system, thereby controlling the connection between the multi-layer heating wire 13 and the power supply. The power supply can be a built-in power supply of the heater or an external power supply, such as a 220V mains power supply.

[0092] Accordingly, the control system 18 can control the connection between the multi-layer heating wire 13 and the power supply via the first temperature protection circuit 16 based on the temperature of the multi-layer heating wire. This allows the control system to control the connection between the multi-layer heating wire and the power supply based on the temperature of the heating wire, preventing excessive temperatures from affecting the heater's service life. Furthermore, it can prevent excessive temperatures from affecting the user experience.

[0093] In this embodiment, a second temperature protection circuit 17 is connected in series to both ends of the multilayer heating wire. This circuit disconnects the multilayer heating wire 13 when its temperature is greater than or equal to the target temperature. This second temperature protection circuit 17 serves as a backup for the first temperature protection circuit 16, further enhancing heater safety. For a detailed description of the two ends of the multilayer heating wire, refer to the preceding embodiments and will not be repeated here.

[0094] Optionally, the first temperature protection circuit 16 is partially arranged at the air outlet of the hair dryer. Figure 1h As shown, the first temperature protection circuit 16 includes a temperature sensor 16a and a switch unit 16b. Optionally, the temperature sensor 16a can be located at the air outlet of the hair dryer, and the switch unit 16b can be located on the PCB where the control system 18 is located, or can be located elsewhere within the outer tube 11, without limitation.

[0095] Furthermore, the second temperature protection circuit 17 can be provided at the air outlet of the hair dryer. Figure 1h and Figure 1iAs shown, the second temperature protection circuit 17 may include: at least one of a temperature protector 17a and a temperature fuse 17b. When the second temperature protection circuit 17 includes: the temperature protector 17a and the temperature fuse 17b, the temperature protector 17a and the temperature fuse 17b are connected in series, and after being connected in series with the two ends of the multi-layer heating wire 13, the temperature protector 17a and the temperature fuse 17b are arranged at the air outlet of the hair dryer.

[0096] It is worth noting that the specific structure, working principle and setting method of the first temperature protection circuit 16 and the second temperature protection circuit 17 can be found in the relevant content of the above embodiment and will not be repeated here.

[0097] Figure 3a 、 Figure 3b and Figure 3c This is a schematic diagram of the structure of another heater provided in an embodiment of the present application. Figure 3a and Figure 3b The heater comprises an outer tube 31 and a support member 32 disposed within the outer tube 31; at least one layer of heating wire 33 is disposed between the outer tube and the support member. The specific structure, arrangement, and relative positional relationship of the outer tube 31, support member 32, and heating wire 33 can be found in the above-mentioned embodiments and will not be further described here.

[0098] like Figure 3a and Figure 3c As shown, in this embodiment of the present application, the heater further includes: a first temperature protection circuit 34, a second temperature protection circuit 35, and a control system 36. The first temperature protection circuit 34 is electrically connected to the control system 36. The power supply can be a built-in power supply of the heater or an external power supply, such as 220V AC power.

[0099] In this embodiment, the first temperature protection circuit 34 can collect the temperature of at least one layer of heating wire 33 and provide the temperature of at least one layer of heating wire 33 to the control system to control the connection between the multiple layers of heating wire 13 and the power supply.

[0100] Accordingly, the control system 36 can control the connection between the at least one layer of heating wire 33 and the power supply via the first temperature protection circuit 34 based on the temperature of the at least one layer of heating wire. This allows the control system to control the connection between the at least one layer of heating wire and the power supply based on the temperature of the at least one layer of heating wire, preventing excessive temperatures from affecting the heater's service life. Furthermore, it can prevent excessive temperatures from affecting the user experience, etc.

[0101] In this embodiment, a second temperature protection circuit 35 is connected in series to both ends of at least one layer of heating wire. This circuit disconnects the circuit containing at least one layer of heating wire 33 when the temperature of the at least one layer of heating wire is greater than or equal to the target temperature. The second temperature protection circuit 35 and the first temperature protection circuit 34 serve as backup for each other, further enhancing heater safety. For a description of the two ends of the heating wire, please refer to the relevant content of the above embodiment.

[0102] In this embodiment, if Figure 3a As shown, the first temperature protection circuit 34 includes: a temperature sensor 34a and a switch unit 34b. In the embodiment of the present application, the specific implementation form of the temperature sensor 34a is not limited. Optionally, the temperature sensor 34a can be a thermistor or a thermocouple, etc., but is not limited thereto. The temperature sensor 34a and the switch unit 34b are respectively electrically connected to the control system 36; and the switch unit 34b is connected between at least one layer of heating wire 33 and a power supply. Among them, the temperature sensor 34a can collect the temperature of at least one layer of heating wire 13 and provide the temperature of at least one layer of heating wire 13 to the control system 36. Accordingly, the control system 36 is used to control the working state of the switch unit 34b according to the temperature of the heating wire 13, and then control the connection state of the heating wire 13 and the power supply. Among them, regarding the specific implementation of the control system 36 controlling the working state of the switch unit 34b, please refer to the relevant content of the above embodiment and will not be repeated here.

[0103] In this embodiment, the switch unit 34b may be disposed on the PCB board where the control system 36 is located, or may be disposed at other locations within the outer cylinder, which is not limited here.

[0104] Further, if Figure 3a As shown, the second temperature protection circuit 35 may include at least one of a temperature protector 35a and a temperature fuse 35b. When the second temperature protection circuit 35 includes the temperature protector 35a and the temperature fuse 35b, the temperature protector 35a and the temperature fuse 35b are connected in series and then connected in series with both ends of at least one layer of the heating wire 13. The operating principles and configuration of the temperature protector 35a and the temperature fuse 35b can be found in the relevant content of the above embodiment and will not be further described here.

[0105] The heater provided in the embodiment of the present application can be applied to various devices that need to heat airflow, such as hair dryers, hand dryers, dryers, etc., but is not limited thereto. The following is an example of applying the heater to a hair dryer.

[0106] Figure 4 This is a structural diagram of another hair dryer provided in an embodiment of the present application. Figure 4As shown, the hair dryer includes: a body shell S41; a heater S42 and a control system S43 are arranged in the body shell S41. The structure of the heater can be seen in the above Figure 3a-3c .like Figure 3a-3c as well as Figure 4 As shown, heater S42 includes an outer tube 31 and a support member 32 disposed within the outer tube 31; at least one layer of heating wire 33 is disposed between the outer tube and the support member. The specific structure, arrangement, and relative positional relationship of the outer tube 31, support member 32, and heating wire 33 can be found in the relevant content of the above embodiment and will not be further described here.

[0107] like Figure 4 and Figure 3c As shown, in the embodiment of the present application, the heater further includes: a first temperature protection circuit 34 and a second temperature protection circuit 35. The first temperature protection circuit 34 is electrically connected to the control system S43.

[0108] In this embodiment, the first temperature protection circuit 34 can collect the temperature of at least one layer of the heating wire 13 and provide the temperature of at least one layer of the heating wire 13 to the control system, thereby controlling the connection between the multiple layers of heating wire 13 and the power supply. The power supply can be a built-in power supply of the heater or an external power supply, such as a 220V mains power supply.

[0109] Accordingly, the control system S43 can control the connection between the at least one layer of heating wire 13 and the power supply via the first temperature protection circuit 34 based on the temperature of the at least one layer of heating wire. This allows the control system to control the connection between the at least one layer of heating wire and the power supply based on the temperature of the at least one layer of heating wire, preventing excessive temperatures from affecting the heater's service life. Furthermore, it can prevent excessive temperatures from affecting the user experience, etc.

[0110] In this embodiment, a second temperature protection circuit 35 is connected in series to both ends of at least one layer of heating wire. This circuit disconnects the circuit containing at least one layer of heating wire 33 when the temperature of the at least one layer of heating wire is greater than or equal to the target temperature. The second temperature protection circuit 35 and the first temperature protection circuit 34 serve as backup for each other, further enhancing heater safety. For a description of the two ends of the heating wire, please refer to the relevant content of the above embodiment.

[0111] It is worth noting that the specific structures, installation positions and methods of the first temperature protection circuit and the second temperature protection circuit can be referred to the relevant contents of the above embodiments and will not be repeated here.

[0112] It should also be noted that, in the embodiment of the present application, the control system may include a processor and its peripheral circuits. Wherein, the processor may be any hardware processing device that can execute the logic of the above method. Optionally, the processor may be a central processing unit (CPU), a graphics processing unit (GPU) or a microcontroller unit (MCU); it may also be a programmable device such as a field programmable gate array (FPGA), a programmable array logic device (PAL), a general array logic device (GAL), a complex programmable logic device (CPLD); or an advanced reduced instruction set (RISC) processor (Advanced RISC Machines, ARM) or a system on chip (System on Chip SOC), etc., but is not limited thereto.

[0113] It should be noted that the descriptions such as "first" and "second" in this article are used to distinguish different messages, devices, modules, etc., and do not represent the order of precedence, nor do they limit "first" and "second" to different types.

[0114] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0116] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0117] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0118] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0119] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0120] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0121] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0122] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A heater, characterized in that: include: An outer cylinder and a support member disposed in the outer cylinder; a sealing cover is disposed at at least one end of the support member; multiple layers of heating wires are disposed between the outer cylinder and the support member, with gaps between the multiple layers of heating wires in the radial direction of the support member; and a heat insulation layer is also disposed between the outer cylinder and the support member; The support member comprises: an inner cylinder and a plurality of fins of different heights arranged on the inner cylinder; each layer of heating wire is wound around a portion of the fins of the same height among the plurality of fins; The heater further comprises: a first temperature protection circuit, a second temperature protection circuit and a control system; The first temperature protection circuit is electrically connected to the control system, and is used to collect the temperature of the multi-layer heating wire and provide the temperature of the multi-layer heating wire to the control system; The control system is used to control the connection state between the multi-layer heating wire and the power supply through the first temperature protection circuit according to the temperature of the multi-layer heating wire; The second temperature protection circuit includes: a temperature protector and a temperature fuse; the temperature protector and the temperature fuse are connected in series, and then connected in series with both ends of the multi-layer heating wire; the temperature protector cuts off the circuit where the multi-layer heating wire is located when the temperature of the multi-layer heating wire is greater than or equal to a first operating temperature; the temperature protector is turned on when the temperature of the multi-layer heating wire is lower than a second operating temperature to restore the circuit between the temperature protector and the multi-layer heating wire; wherein the second operating temperature is lower than the first operating temperature; The temperature fuse is melted when the temperature of the multi-layer heating wire is higher than its melting temperature, so as to cut off the circuit where the multi-layer heating wire is located; the melting temperature is higher than the first action temperature.

2. The heater according to claim 1, wherein The heat insulation layer is provided on the outer wall of the support member and / or the inner wall of the outer cylinder.

3. The heater according to claim 1, wherein One end of the inner cylinder is provided with the sealing cover, and the other end is open; the inner cylinder and the sealing cover are an integrally formed structure.

4. The heater according to claim 3, characterized in that The inner cylinder is a hollow truncated cone structure, and the sealing cover is arranged on the small end surface of the truncated cone structure.

5. The heater according to claim 3, characterized in that One end of the plurality of fins is fixed on the sealing cover, and the other end is fixed to the opening of the inner cylinder.

6. The heater according to any one of claims 1 to 5, characterized in that: The heating wire has a wave structure.

7. The heater according to claim 6, characterized in that The wave height of the heating wire is greater than or equal to 3.5 mm and less than or equal to 7 mm.

8. The heater according to claim 6, wherein The diameter of the heating wire is greater than or equal to 0.35 mm and less than or equal to 0.45 mm.

9. The heater according to claim 6, characterized in that The multi-layer heating wire includes a first layer of heating wire and a second layer of heating wire; the length of the first layer of heating wire is greater than or equal to the length of the second layer of heating wire, and the diameter of the first layer of heating wire is greater than the diameter of the second layer of heating wire.

10. The heater according to claim 1, wherein The diameter of the outer cylinder is greater than the diameter of the inner cylinder and is less than or equal to 3 times the diameter of the inner cylinder.

11. The heater according to claim 10, characterized in that The multi-layer heating wire has two layers; the diameter of the outer cylinder is larger than the diameter of the inner cylinder, and smaller than 2 times the diameter of the inner cylinder.

12. The heater according to claim 10, wherein The multi-layer heating wire has three layers; the diameter of the outer cylinder is greater than twice the diameter of the inner cylinder and less than three times the diameter of the inner cylinder.

13. The heater according to claim 10, wherein The diameter of the outer cylinder is greater than or equal to 40 mm and less than or equal to 80 mm; the diameter of the inner cylinder is greater than or equal to 20 mm and less than or equal to 40 mm.

14. The heater according to claim 10, wherein The distance between the inner cylinder and the outer cylinder is greater than or equal to 20 mm and less than or equal to 60 mm.

15. The heater according to any one of claims 1 to 5, characterized in that: The first temperature protection circuit includes: a temperature sensor and a switch unit; the temperature sensor and the switch unit are electrically connected to the control system respectively; the switch unit is connected between the multi-layer heating wire and the power supply; The temperature sensor is used to collect the temperature of the multi-layer heating wire and provide the temperature of the multi-layer heating wire to the control system; the control system is used to control the working state of the switch unit according to the temperature of the heating wire.

16. The heater according to claim 15, characterized in that The temperature sensor is arranged on the support member; and the lead wires between the temperature sensor and the control system are distributed along the outer wall of the support member or the inner wall of the outer cylinder.

17. A heater, characterized in that: include: an outer cylinder and a support member disposed in the outer cylinder; At least one layer of heating wire is provided between the outer cylinder and the support member; A heat insulation layer is provided between the outer cylinder and the support member; The heater further comprises: a first temperature protection circuit, a second temperature protection circuit and a control system; the first temperature protection circuit is electrically connected to the control system, and the first temperature protection circuit is used to collect the temperature of the at least one layer of heating wire and provide the temperature of the at least one layer of heating wire to the control system; The control system is configured to control the connection state between the at least one layer of heating wire and the power supply through the first temperature protection circuit according to the temperature of the at least one layer of heating wire; The second temperature protection circuit includes: a temperature protector and a temperature fuse; the temperature protector and the temperature fuse are connected in series, and then connected in series with two ends of the at least one layer of heating wire; the temperature protector cuts off the circuit of the at least one layer of heating wire when the temperature of the at least one layer of heating wire is greater than or equal to the first operating temperature; the temperature protector is turned on when the temperature of the at least one layer of heating wire is lower than the second operating temperature to restore the circuit between the temperature protector and the at least one layer of heating wire; wherein the second operating temperature is lower than the first operating temperature; The temperature fuse is melted when the temperature of the at least one layer of heating wire is higher than its melting temperature, so as to cut off the circuit where the at least one layer of heating wire is located; the melting temperature is higher than the first action temperature.

18. A hair dryer, characterized in that: include: body shell; A fan assembly and a heater are provided in the housing; the heater comprises an outer cylinder and a support member provided in the outer cylinder; a sealing cover is provided at at least one end of the support member; multiple layers of heating wires are provided between the outer cylinder and the support member, with gaps between the multiple layers of heating wires in the radial direction of the support member; and a heat insulating layer is also provided between the outer cylinder and the support member. The support member comprises: an inner cylinder and a plurality of fins of different heights arranged on the inner cylinder; each layer of heating wire is wound around a portion of the fins of the same height among the plurality of fins; The heater further comprises: a first temperature protection circuit, a second temperature protection circuit and a control system; The first temperature protection circuit is electrically connected to the control system, and is used to collect the temperature of the multi-layer heating wire and provide the temperature of the multi-layer heating wire to the control system; The control system is used to control the connection state between the multi-layer heating wire and the power supply through the first temperature protection circuit according to the temperature of the multi-layer heating wire; The second temperature protection circuit includes: a temperature protector and a temperature fuse; the temperature protector and the temperature fuse are connected in series, and then connected in series with both ends of the multi-layer heating wire; the temperature protector cuts off the circuit where the multi-layer heating wire is located when the temperature of the multi-layer heating wire is greater than or equal to a first operating temperature; the temperature protector is turned on when the temperature of the multi-layer heating wire is lower than a second operating temperature to restore the circuit between the temperature protector and the multi-layer heating wire; wherein the second operating temperature is lower than the first operating temperature; The temperature fuse is melted when the temperature of the multi-layer heating wire is higher than its melting temperature, so as to cut off the circuit where the multi-layer heating wire is located; the melting temperature is higher than the first action temperature.

19. A hair dryer, characterized in that: include: body shell; A heater, a fan assembly and a control system are arranged in the housing; the heater comprises an outer cylinder and a support member arranged in the outer cylinder; at least one layer of heating wire is arranged between the outer cylinder and the support member; The heater further comprises: a first temperature protection circuit and a second temperature protection circuit; the first temperature protection circuit is electrically connected to the control system, and the first temperature protection circuit is used to collect the temperature of the at least one layer of heating wire and provide the temperature of the at least one layer of heating wire to the control system; The control system is configured to control the connection state between the at least one layer of heating wire and the power supply through the first temperature protection circuit according to the temperature of the at least one layer of heating wire; The second temperature protection circuit includes: a temperature protector and a temperature fuse; the temperature protector and the temperature fuse are connected in series, and then connected in series with two ends of the at least one layer of heating wire; the temperature protector cuts off the circuit of the at least one layer of heating wire when the temperature of the at least one layer of heating wire is greater than or equal to the first operating temperature; the temperature protector is turned on when the temperature of the at least one layer of heating wire is lower than the second operating temperature to restore the circuit between the temperature protector and the at least one layer of heating wire; wherein the second operating temperature is lower than the first operating temperature; The temperature fuse is melted when the temperature of the at least one layer of heating wire is higher than its melting temperature, so as to cut off the circuit where the at least one layer of heating wire is located; the melting temperature is higher than the first action temperature.

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