Overheat protection method for common circuit

Abstract

According to the overheat protection method of the common circuit, overheat protection is connected into a circuit where an electric appliance is located, the resistance of the overheat protection is adjusted according to the working time of the electric appliance, heat generated by an adjusting resistor in a self-adaptive cavity in the working process can be accumulated in a strain area, the temperature in the strain area is increased, and the overheat protection is achieved. When the air pressure rises, the air pressure rises to push the separation slide block to move towards the low-voltage area, so that the resistance of the circuit where the electric appliance is located is increased, the current distributed by the electric appliance is reduced, the power is reduced, and the heat is reduced until the electric appliance cannot work due to power shortage, the circuit where the electric appliance is located is powered off, and the electric appliance does not accumulate heat any more. Meanwhile, heat accumulation and movement in the self-adaptive variable resistor are stopped, the real-time power of the electric appliance is adjusted in real time through the self-adaptive variable resistor, heat accumulation of circuit work is reduced, and the protection effect on circuit overheating is improved.

Description

Technical Field

[0001] The present invention relates to an overheat protection method for a common circuit, and in particular to an overheat protection method for a common circuit applied in the field of emergency circuit protection devices. Background Art

[0002] In order to solve the problem of electrical appliances burning out or even causing fires due to overheating of circuits during use, the design of fuses and air switches has a certain market share in the market. Air switches, also known as air circuit breakers, are a type of circuit breaker. They are switches that automatically disconnect as long as the current in the circuit exceeds the rated current. Air switches are very important electrical appliances in low-voltage power distribution networks and electric traction systems. They integrate control and multiple protection functions. In addition to contacting and disconnecting circuits, they can also protect circuits or electrical equipment from short circuits, severe overloads and undervoltages. They can also be used to start motors infrequently.

[0003] In the existing circuit overheat protection devices, whether it is an air switch or a fuse, they all monitor the instantaneous strong current in the circuit: when a short circuit occurs in the electrical appliance in the circuit, an instantaneous strong current will be generated, and this strong current will instantly melt the fuse or trigger the air switch to disconnect it, thereby causing the power line to be broken, thus achieving a protective effect.

[0004] However, electrical appliances will generate a lot of heat during the continuous use of electricity, especially some appliances with poor heat dissipation performance. These appliances will also accumulate a lot of heat under rated voltage and current, causing circuit overheating, and then causing circuit fire accidents: During the use of electric blankets in winter, once there is long-term continuous use, the high temperature generated by the long-term use of the circuit will cause the circuit itself to age rapidly, and then easily induce electric blanket fire accidents, causing serious safety accidents and property losses.

[0005] Application Contents

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that after the electrical appliance is used for a long time, the circuit burns due to the heat accumulation.

[0007] In order to solve the above problems, the present invention provides a common circuit overheat protection method, which mainly includes the following steps:

[0008] S1. A circuit overheat protection device is connected. Before the electrical appliance is connected to the mains module through the electrical plug, the overheat protection is first connected, and then connected to the power socket and then to the mains module through the overheat protection to provide energy for the electrical appliance. The overheat protection includes a shell, an adaptive cavity is excavated in the shell, a side viewing window is fixedly connected to the side wall of the adaptive cavity, an adaptive variable resistor is fixedly connected in the adaptive cavity, and the adaptive variable resistor can make the resistance adaptively change with the length of time it is powered on;

[0009] S2. Start the protection program. When the electrical appliance is connected to the mains module for a long time to work, the resistance of the overheat protection device itself will rise adaptively, reducing the current in the circuit where the electrical appliance is located, reducing the working power of the electrical appliance, and reducing the heating efficiency of the electrical appliance circuit.

[0010] In the overheat protection method of the above-mentioned commonly used circuit, an adaptive variable resistor is used to adjust the real-time power of the electrical appliance in real time to reduce the heat accumulation during circuit operation.

[0011] As a further improvement of the present application, in step S1, in the access circuit overheat protection device, before the overheat protection is connected to the AC power module, the overheat protection is connected to the smart terminal signal using Bluetooth, and the real-time working status of the overheat protection is monitored using the smart terminal, so as to better understand the working status of the electrical appliance. At the same time, after most of the resistance in the overheat protection is mobilized and connected to the circuit, an alarm message can be sent to the smart terminal, and the line where the electrical appliance is located can be manually disconnected to increase the protection effect on the circuit inside the electrical appliance.

[0012] As a further improvement of the present application, the smart terminal signal is connected to the IoT cloud, and information between the smart terminal and the IoT cloud is bidirectionally connected. The smart terminal can download operating data of electrical appliances from the IoT cloud to provide users with usage plans for electrical appliances. At the same time, when the overheating protection alarm is sent to the smart terminal and the power is not cut off for a long time, the smart terminal automatically sends an alarm through the IoT cloud, which can effectively avoid casualties.

[0013] As a further improvement of the present application, the adaptive variable resistor includes a matching insulating fixing rod and an insulating shell, the insulating fixing rod passes through and is fixedly connected to the insulating shell, and the insulating shell is in a sealed state, the outer side of the insulating fixing rod is provided with an adjustment resistor, the outer side of the adjustment resistor is provided with a partition slider, the partition slider divides the internal space of the insulating shell into a strain zone and a low-pressure zone, and the strain zone and the low-pressure zone are not connected, a compression spring is provided in the low-pressure zone, the two ends of the compression spring are respectively fixedly connected to the partition slider and the inner wall of the insulating fixing rod, a positioning rod is fixedly connected between the inner walls of the insulating fixing rod, and the positioning rod passes through the partition slider, a conductive tube is buried in the partition slider, and the conductive tube connects the adjustment resistor and the positioning rod.

[0014] As an improvement of the present application, the outer shell and the insulating shell need to be made of materials with stable thermal conductivity. The stability of the thermal conductivity can ensure the stability of the overall operation of the adaptive variable resistor, and it is not easy to cause the structural changes inside the adaptive variable resistor to lose regularity due to changes in the thermal conductivity, and it is not easy to affect the normal operation of the adaptive variable resistor.

[0015] As another improvement of the present application, high-power electrical appliances require a corresponding increase in the thermal conductivity of the insulating casing, and the adaptive variable resistor is not easily triggered frequently, causing the electrical appliances to be unable to be used normally. Low-power electrical appliances require a decrease in the thermal conductivity of the insulating casing to ensure normal accumulation of heat, so that the adaptive variable resistor can take effect normally.

[0016] As an improvement of the present application, an insulating coating is coated on the outer wall of the compression spring, so that the compression spring is not prone to short circuit when it contacts the adjustment resistor during movement.

[0017] As an improvement of the present application, a processing terminal is mounted inside the shell, and a slot is bored at one end of the shell close to the electrical plug. An annular pressure sensor is fixedly connected to the bottom plate of the slot, and the annular pressure sensor is connected to the signal of the processing terminal. The processing terminal can control the on and off of the overall circuit inside the overheat protection. Only when the electrical plug is inserted into the shell and uniform force is applied to the annular pressure sensor, the overheat protection will be energized as a whole, thereby preventing electric shock accidents caused by inserting fingers into the interface.

[0018] As another improvement of the present application, an electromagnetic block is fixedly connected to the bottom plate of the slot, and the electrical plug includes an electric plug, and an end of the electric plug close to the overheat protection is fixedly connected to a magnetic plate matching the electromagnetic block. During the operation of the electrical appliance, the electrical plug can be fixed in the slot by the adsorption force between the electromagnetic block and the magnetic plate, and the electrical plug is not easy to fall off.

[0019] As a further improvement of the present application, the electromagnetic block is connected to the signal of the processing terminal, a movable groove is opened on the bottom plate of the slot, a top cap is slidably connected in the movable groove, and a compression spring is fixedly connected between the top cap and the bottom plate of the movable slot. When the electrical appliance needs to be powered off but the user fails to do so in time, the processing terminal disconnects the power to the electromagnetic block, the electromagnetic block and the magnetic plate lose their adsorption effect, and the compression spring in the compressed state will push the electrical plug out of the slot, thereby increasing the safety of the circuit in the electrical appliance.

[0020] In summary, by connecting overheat protection to the circuit where the electrical appliance is located and adjusting the resistance of the overheat protection according to the working time of the electrical appliance, the heat generated by the adjustable resistor in the adaptive cavity during the working process will accumulate in the strain area, causing the temperature in the strain area to rise, and the air pressure will also rise accordingly, pushing the separation slider to move toward the low-pressure area, so that the resistance of the line where the electrical appliance is connected increases, the current allocated to the electrical appliance decreases, the power is reduced, and the heat will also decrease accordingly, until the electrical appliance loses power and cannot work, and the line where the electrical appliance is located is powered off, the electrical appliance will no longer accumulate heat, thereby protecting the safety of the circuit in the electrical appliance, and at the same time, the heat accumulation in the adaptive variable resistor stops. As the temperature in the adaptive variable resistor drops, the position of the separation slider will return to the top under the action of the compression spring in the compressed state, and when the electrical appliance has enough rest time, it can be started normally next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of the main structure of the circuit overheat protection device of the first embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the structure of the circuit overheat protection device of the first embodiment of the present application;

[0023] Figure 3 This is a schematic structural diagram of an electrical plug equipped with a magnetic plate according to the first embodiment of the present application;

[0024] Figure 4 This is a diagram of a circuit overheat protection device according to a first embodiment of the present application;

[0025] Figure 5 A side view of a circuit overheat protection device according to a first embodiment of the present application;

[0026] Figure 6 A side cross-sectional view of a circuit overheat protection device according to a first embodiment of the present application;

[0027] Figure 7 This is a schematic diagram of the structure of an adaptive variable resistor according to the first embodiment of the present application;

[0028] Figure 8 The cross-sectional structure of the adaptive variable resistor according to the first embodiment of the present application is schematically shown;

[0029] Fig. 9 This is a simplified diagram of the working system of the circuit overheat protection device in the second embodiment of the present application;

[0030] Fig.10 This is a simplified circuit diagram of the circuit overheat protection device according to the first embodiment of the present application.

[0031] Description of the numbers in the figure:

[0032] 1 power socket, 2 overheat protection, 201 shell, 202 adaptive cavity, 203 slot, 204 side viewing window, 205 annular pressure sensor, 206 electromagnetic block, 207 movable slot, 208 top cap, 209 compression spring, 3 electrical plug, 301 electrical plug, 302 magnetic plate, 4 adaptive variable resistor, 401 insulating fixed rod, 402 insulating shell, 403 adjustment resistor, 404 partition slider, 405 compression spring, 406 positioning rod, 407 conductive tube, 5 electrical appliances, 6 smart terminal, 7 Internet of Things cloud, 8 AC module, 9 air switch. DETAILED DESCRIPTION

[0033] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0034] The first implementation method:

[0035] Figure 1-2 , Figure 6 and Fig.10 Shown: A common circuit overheat protection method mainly includes the following steps:

[0036] S1. Connect the circuit overheat protection device. Before the electrical appliance 5 is connected to the mains module 8 through the electrical plug 3, first connect the overheat protection 2, then connect to the power socket 1 and then to the mains module 8 through the overheat protection 2 to provide energy for the electrical appliance 5. The overheat protection 2 includes a shell 201, an adaptive cavity 202 is excavated in the shell 201, a side viewing window 204 is fixedly connected to the side wall of the adaptive cavity 202, and an adaptive variable resistor 4 is fixedly connected in the adaptive cavity 202, and the adaptive variable resistor 4 can make the resistance change adaptively as the power-on time of itself;

[0037] S2. Start the protection program. When the electrical appliance 5 is connected to the mains module 8 for a long time to work, the resistance of the overheat protection 2 itself rises adaptively, reducing the current in the circuit where the electrical appliance 5 is located, reducing the working power of the electrical appliance 5, reducing the heating efficiency of the circuit of the electrical appliance 5, and increasing the safety of the circuit in which the electrical appliance 5 is located.

[0038] See also Figure 6-8The adaptive variable resistor 4 includes a matching insulating fixed rod 401 and an insulating shell 402. The insulating fixed rod 401 penetrates and is fixedly connected to the insulating shell 402, and the insulating shell 402 is in a sealed state. The outer side of the insulating fixed rod 401 is sleeved with an adjustment resistor 403, and the outer side of the adjustment resistor 403 is sleeved with a separation slider 404. The separation slider 404 divides the internal space of the insulating shell 402 into a strain zone and a low-pressure zone, and the strain zone and the low-pressure zone are not connected. A compression spring 405 is provided in the low-pressure zone, and the two ends of the compression spring 405 are respectively fixedly connected to the separation slider 404 and the inner wall of the insulating fixed rod 401. A positioning rod 406 is fixedly connected between the inner walls of the insulating fixed rod 401, and the positioning rod 406 penetrates the separation slider 404. A conductive tube 407 is buried in the separation slider 404, and the conductive tube 407 connects the adjustment resistor 403 and the positioning rod 406.

[0039] In this solution, the adaptive variable resistor 4, except for the adjustment resistor 403 and the conductive tube 407, is made of insulating material. Figure 8 For example, in addition to the structure disclosed in the present application, an access line needs to be buried inside the insulating fixed rod 401, one end of which is connected to the power input end, and the other end is connected to the leftmost side of the adjustment resistor 403, so that the adjustment resistor 403 is connected to the external line. Similarly, a corresponding output line is also buried in the positioning rod 406, one end of which is connected to the power output end, and the other end can be connected to the conductive tube 407 by sliding, that is, no matter where the conductive tube 407 slides, it can be connected to the output line buried in the compression spring 405. In this way, a current flowing from the access line buried in the insulating fixed rod 401 to the local adjustment resistor 403 - conductive tube 407 - local output line can be formed in the adaptive variable resistor 4. By squeezing the length of the adjustment resistor 403 in the above-mentioned line, the size of the resistance of the adaptive variable resistor 4 entering the line can be changed. The layout of the above-mentioned access line and output line and the connection method with the external circuit are well-known technologies to those skilled in the art. Those skilled in the art can make reasonable layouts and connections based on the existing ones, so they are not disclosed in detail in the present application.

[0040] In this solution, the shell 201 and the insulating shell 402 need to be made of materials with stable thermal conductivity. The stability of thermal conductivity can ensure the stability of the overall operation of the adaptive variable resistor 4. It is not easy to cause the structural changes in the adaptive variable resistor 4 to lose regularity due to changes in thermal conductivity, and it is not easy to affect the normal operation of the adaptive variable resistor 4. The thermal conductivity of the insulating shell 402 needs to match the power of the connected electrical appliances. High-power electrical appliances 5 require a corresponding increase in the thermal conductivity of the insulating shell 402, so that the adaptive variable resistor 4 is not easily triggered frequently, causing the electrical appliances to be unable to be used normally. Low-power electrical appliances 5 require a reduction in the thermal conductivity of the insulating shell 402 to ensure the normal accumulation of heat so that the adaptive variable resistor 4 can take effect normally.

[0041] The outer wall of the compression spring 405 is coated with an insulating coating, so that a short circuit is not likely to occur when the compression spring 405 contacts the adjustment resistor 403 during movement.

[0042] In this proposal, please refer to Fig.10 Before the electrical appliance 5 is connected to the mains module 8, it is necessary to first connect the overheat protection 2 in its own circuit, and the air switch 9 is commonly connected to the total circuit of multiple mains modules 8. When a short circuit occurs in the circuit of an electrical appliance 5 and the instantaneous current surges, the air switch 9 will take effect, disconnect the circuit, and all electrical appliances 5 will stop working. When an electrical appliance 5 is powered on for a long time, the corresponding overheat protection 2 will also be in operation for a long time. The heat generated by the adjustment resistor 403 in the adaptive cavity 202 during the working process will accumulate in the strain area, causing the temperature in the strain area to rise, and the air pressure will also rise accordingly. At the same time, the air pressure in the low-pressure air is low, and the air pressure change caused by the temperature change The temperature of the electric appliance 5 will also decrease, so the air in the strain area will push the separation slider 404 to move toward the low-pressure area, so that the resistance of the line where the electrical appliance 5 is connected increases, the current shared by the electrical appliance 5 decreases, the power decreases, and the heat generation will also decrease accordingly, until the electrical appliance 5 runs out of power and cannot work, and the line where the electrical appliance 5 is located is powered off. The electrical appliance 5 will no longer accumulate heat, thereby protecting the safety of the circuit in the electrical appliance 5. At the same time, the heat accumulation in the adaptive variable resistor 4 also stops. As the temperature in the adaptive variable resistor 4 drops, the compression spring 405 in a compressed state will return the position of the separation slider 404 to the top, and when the electrical appliance 5 has enough rest time, it can be started normally next time.

[0043] The second implementation method:

[0044] Fig. 9 The working system of the circuit overheat protection device is shown. In step S1, in the access circuit overheat protection device, before the overheat protection 2 is connected to the mains module 8, the overheat protection 2 is connected to the smart terminal 6 signal by using Bluetooth. The real-time working status of the overheat protection 2 is monitored by the smart terminal 6, so as to better understand the working status of the electrical appliance 5. At the same time, after most of the resistor 403 in the overheat protection 2 is mobilized to be connected to the circuit, an alarm message can be sent to the smart terminal 6, and the line where the electrical appliance 5 is located can be manually disconnected to increase the protection effect of the circuit in the electrical appliance 5. The smart terminal 6 signal is connected to the Internet of Things cloud 7, and the information between the smart terminal 6 and the Internet of Things cloud 7 is bidirectionally connected. The smart terminal 6 can download the operating data of the electrical appliance 5 from the Internet of Things cloud 7 to provide the user with a use plan of the electrical appliance 5. At the same time, when the overheat protection 2 sends an alarm to the smart terminal 6 for a long time without power failure, the smart terminal 6 automatically sends an alarm through the Internet of Things cloud 7, which can effectively avoid casualties.

[0045] See also Figure 3-6, a processing terminal is mounted in the housing 201, a slot 203 is bored at one end of the housing 201 near the electrical plug 3, an annular pressure sensor 205 is fixedly connected to the bottom plate of the slot 203, and the annular pressure sensor 205 is connected to the signal of the processing terminal, the processing terminal can control the on and off of the entire circuit in the overheat protection 2, only when the electrical plug 3 is inserted into the housing 201 and a uniform force is applied to the annular pressure sensor 205, the overheat protection 2 will be energized as a whole to prevent electric shock accidents caused by fingers inserted into the interface, an electromagnetic block 206 is fixedly connected to the bottom plate of the slot 203, the electrical plug 3 includes an electric plug 301, and a magnetic plate 302 matching the electromagnetic block 206 is fixedly connected to one end of the electric plug 301 near the overheat protection 2, in During the operation of the electrical appliance 5, the electrical plug 3 can be fixed in the slot 203 by the adsorption force between the electromagnetic block 206 and the magnetic plate 302, and the electrical plug 3 is not easy to fall off. The electromagnetic block 206 is connected to the signal of the processing terminal, and a movable groove 207 is opened on the bottom plate of the slot 203. A top cap 208 is slidably connected in the movable groove 207, and a compression spring 209 is fixedly connected between the top cap 208 and the bottom plate of the movable groove 207. When the electrical appliance 5 needs to be powered off but the user fails to do so in time, the processing terminal disconnects the power supply of the electromagnetic block 206, and the electromagnetic block 206 and the magnetic plate 302 lose their adsorption effect. The compression spring 209 in the compressed state will push the electrical plug 3 out of the slot 203, thereby increasing the safety of the circuit in the electrical appliance 5.

[0046] In the first implementation mode of the present scheme, by connecting an overheat protection 2 to the circuit where the electrical appliance 5 is located, and adjusting the resistance of the overheat protection 2 according to the working time of the electrical appliance 5, the heat generated by the adjustment resistor 403 in the adaptive cavity 202 during operation will accumulate in the strain zone, causing the temperature in the strain zone to rise, and the air pressure will also rise accordingly, pushing the separation slider 404 to move toward the low-pressure zone, so that the resistance of the line where the electrical appliance 5 is connected increases, the current allocated to the electrical appliance 5 decreases, the power is reduced, and the heat generation will also decrease accordingly, until the electrical appliance 5 loses power and cannot work, and the line where the electrical appliance 5 is located is powered off, the electrical appliance 5 will no longer accumulate heat, thereby protecting the safety of the circuit in the electrical appliance 5, and at the same time, the heat accumulation in the adaptive variable resistor 4 also stops. As the temperature in the adaptive variable resistor 4 drops, the compression spring 405 in a compressed state will return the position of the separation slider 404 to the top, and when the electrical appliance 5 has enough rest time, it can be started normally next time.

[0047] In the second real-time method, the smart terminal 6 and the Internet of Things cloud 7 are introduced. The smart terminal 6 is used to monitor the real-time working status of the overheat protection 2, so as to better understand the working status of the electrical appliance 5, and then remind the operator to disconnect the line where the electrical appliance 5 is located, thereby increasing the protection effect of the circuit inside the electrical appliance 5. At the same time, the smart terminal 6 can download the operating data of the electrical appliance 5 from the Internet of Things cloud 7 to provide the user with a usage plan for the electrical appliance 5. When the overheat protection 2 sends an alarm to the smart terminal 6 for a long time without power failure, the smart terminal 6 will alarm through the Internet of Things cloud 7, which can effectively avoid casualties.

[0048] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A common circuit overheat protection method, characterized in that: The main steps include: S1, connecting the circuit overheat protection device, before the electrical appliance (5) is connected to the mains module (8) through the electrical appliance plug (3), the overheat protection (2) is first connected, and then the overheat protection (2) is connected to the power socket (1) and then to the mains module (8), so as to provide energy for the electrical appliance (5), and the adaptive variable resistor (4) can make the resistance change adaptively according to the power-on time of the electrical appliance; S2, starting the protection program. When the electrical appliance (5) is connected to the mains module (8) for a long time to work, the resistance of the overheat protection (2) itself rises adaptively, reducing the current in the circuit where the electrical appliance (5) is located, reducing the working power of the electrical appliance (5), and reducing the heating efficiency of the circuit of the electrical appliance (5).

2. The overheat protection method for a common circuit according to claim 1, characterized in that: In the step S1, in which the overheat protection device is connected to the circuit, before the overheat protection device (2) is connected to the mains module (8), the overheat protection device (2) is connected to the smart terminal (6) signal by using Bluetooth.

3. The overheat protection method for a common circuit according to claim 2, characterized in that: In the step S1, in which the circuit overheat protection device is connected, the smart terminal (6) is signal-connected to the Internet of Things cloud (7), and information between the smart terminal (6) and the Internet of Things cloud (7) is bidirectionally connected.

4. An overheat protection, characterized in that: The overheat protection device (2) comprises a shell (201), an adaptive cavity (202) is excavated in the shell (201), a side viewing window (204) is fixedly connected to the side wall of the adaptive cavity (202), an adaptive variable resistor (4) is fixedly connected in the adaptive cavity (202), the adaptive variable resistor (4) comprises a matching insulating fixed rod (401) and an insulating shell (402), the insulating fixed rod (401) penetrates and is fixedly connected to the insulating shell (402), and the insulating shell (402) is in a sealed state, an adjustable resistor (403) is sleeved on the outer side of the insulating fixed rod (401), and the outer side of the adjustable resistor (403) is The side sleeve is provided with a separation slider (404), the separation slider (404) divides the internal space of the insulating shell (402) into a strain zone and a low-pressure zone, and the strain zone and the low-pressure zone are not connected. A compression spring (405) is provided in the low-pressure zone, and the two ends of the compression spring (405) are respectively fixedly connected to the separation slider (404) and the inner wall of the insulating fixed rod (401). A positioning rod (406) is fixedly connected between the inner walls of the insulating fixed rod (401), and the positioning rod (406) passes through the separation slider (404). A conductive tube (407) is buried in the separation slider (404), and the conductive tube (407) connects the adjustment resistor (403) and the positioning rod (406).

5. An overheat protection according to claim 4, characterized in that: The housing (201) and the insulating housing (402) need to be made of a material with stable thermal conductivity.

6. An overheat protection according to claim 4, characterized in that: The insulating housing (402) with high thermal conductivity is used for high-power electrical appliances (5), and the insulating housing (402) with low thermal conductivity is used for low-power electrical appliances (5).

7. An overheat protection according to claim 4, characterized in that: The outer wall of the compression spring (405) is coated with an insulating coating.

8. An overheat protection according to claim 4, characterized in that: The housing (201) is provided with a processing terminal. A slot (203) is formed at one end of the housing (201) close to the electrical plug (3). An annular pressure sensor (205) is fixedly connected to the bottom plate of the slot (203), and the annular pressure sensor (205) is connected to the processing terminal signal.

9. An overheat protection according to claim 8, characterized in that: An electromagnetic block (206) is fixedly connected to the bottom plate of the slot (203), and the electrical plug (3) comprises an electrical plug (301). An end of the electrical plug (301) close to the overheat protection (2) is fixedly connected to a magnetic plate (302) matching the electromagnetic block (206).

10. An overheat protection according to claim 8, characterized in that: The electromagnetic block (206) is connected to the processing terminal signal, a movable groove (207) is cut on the bottom plate of the slot (203), a top cap (208) is slidably connected in the movable groove (207), and a compression spring (209) is fixedly connected between the top cap (208) and the bottom plate of the movable groove (207).

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