An automatic reset temperature sensitive control device

Abstract

The application relates to the technical field of temperature-sensitive control, in particular to an automatic reset type temperature-sensitive control device, which comprises a device main body, rotating boxes are fixedly connected to the two sides of the device main body, an alternating heat conduction mechanism is arranged in the rotating boxes, the alternating heat conduction mechanism comprises heat insulation plates which are slidingly connected in the rotating boxes, left plates and right plates are fixedly connected to the two sides of the heat insulation plates, left heat conduction fins are slidingly connected to the end portions of the left plates, when the electrical equipment is damaged to cause abnormal temperature rise, the bimetallic strip is bent greatly when sensing the continuous high temperature, at the moment, the pressure rod drives the bimetallic strip to move downwards and is separated from the right heat conduction fin, the continuous transmission of the heat source to the bimetallic strip is cut off, plastic deformation of the bimetallic strip beyond the elastic bending limit is avoided, the bimetallic strip can be normally reset when the temperature falls back, and the long-term use performance of the bimetallic strip is ensured.

Description

Technical Field

[0001] This invention relates to the field of temperature-sensitive control technology, specifically to an automatic reset type temperature-sensitive control device. Background Technology

[0002] Temperature-sensitive control devices, as a type of thermal switch, are an indispensable safety protection component in electrical equipment. Their core function is to sense temperature changes during the operation of electrical equipment and automatically connect or disconnect the circuit, thereby preventing equipment from being damaged or catching fire due to overheating. They are widely used in various electrical equipment that require temperature monitoring.

[0003] Existing temperature-sensitive control devices mostly use a single-material heat-conducting sheet to conduct temperature to a bimetallic strip. This fixed thermal conductivity cannot flexibly adapt to the needs of different operating stages. If the heat-conducting sheet has excessively high thermal conductivity, after the equipment triggers a power-off due to overheating, the heat stored in the internal metal components and conductive parts will be rapidly transferred to the bimetallic strip through the heat-conducting sheet. This causes the bimetallic strip to misjudge the true temperature of the equipment, leading to premature or repeated resets and other malfunctions, making accurate reset control impossible. If the heat-conducting sheet has weak thermal conductivity, it cannot quickly capture the overheating signal, resulting in a delayed triggering of the bimetallic strip and an inability to cut off the circuit in time, thus failing to provide effective overheat protection. Furthermore, existing devices lack a high-temperature protection mechanism for the bimetallic strip. When electrical equipment malfunctions and causes an abnormal temperature rise, the bimetallic strip will be continuously subjected to high temperatures. Exceeding its elastic bending limit, it is prone to irreversible plastic deformation, preventing the bimetallic strip from returning to its initial working state when the temperature drops. This results in the loss of temperature sensing function, shortening the device's lifespan, and potentially causing the circuit to malfunction or disconnect due to bimetallic strip failure, leading to secondary safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic reset type temperature-sensitive control device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic reset type temperature-sensitive control device, comprising a device body, with a switching box fixedly connected to both sides of the device body, and an alternating heat conduction mechanism disposed inside the switching box. The alternating heat conduction mechanism includes a heat insulation plate slidably connected inside the switching box, a left plate and a right plate fixedly connected to both sides of the heat insulation plate respectively, a left heat conduction sheet slidably connected to the end of the left plate, a first tension spring fixedly connected inside the left heat conduction sheet, the other end of the first tension spring fixedly connected to the outer wall of the left plate, a right heat conduction sheet slidably connected to the end of the right plate, a second tension spring fixedly connected inside the right heat conduction sheet, the other end of the second tension spring fixedly connected to the outer wall of the right plate, and sealing plates fixedly connected to the outer walls of both the left and right heat conduction sheets. A bimetallic strip is installed inside the device body. When over-temperature triggering occurs, the left heat conduction sheet contacts the bimetallic strip, and during the reset phase, the right heat conduction sheet switches to contact the bimetallic strip.

[0006] Preferably, the inside of the replacement box is provided with an insertion port that extends into the interior of the main body of the equipment. A roller is provided inside the insertion port. Two heat insulation boxes are fixedly connected to the outer wall of the replacement box. An electric rod is fixedly connected inside each of the two heat insulation boxes. A metal sheet protection mechanism and a temperature control mechanism are provided inside the main body of the equipment.

[0007] Preferably, the metal sheet protection mechanism includes protective boxes fixedly connected to both sides of the equipment body. A pressure rod is slidably connected through both protective boxes. One end of the pressure rod located outside the protective box is fixedly connected to the outer wall of the bimetallic strip. A roller is rotatably connected to the other end of the pressure rod located inside the protective box. A tension spring is fixedly connected to the outer wall of the bimetallic strip. The end of the tension spring away from the bimetallic strip is connected to the outer wall of the protective box.

[0008] Preferably, side boxes are fixedly connected to both sides of the main body of the equipment, and heat insulation baffles are slidably connected inside the side boxes on both sides. A swing arm is rotatably connected to the heat insulation baffle. The end of the swing arm away from the heat insulation baffle is rotatably connected to the outer wall of the pressure rod. A through groove corresponding to the swing arm is opened at the bottom of the side box.

[0009] Preferably, an electric telescopic rod is fixedly connected to one of the outer walls of the two protective boxes, and wedge-shaped parts are slidably connected inside the two protective boxes. A connecting rod is fixedly connected between the two wedge-shaped parts, and the end of the electric telescopic rod is fixedly connected to one of the outer walls of the two wedge-shaped parts. An insert rod is fixedly connected to the outer wall of the connecting rod.

[0010] Preferably, the temperature control mechanism includes a rear cover fixedly connected to the outer wall of the device body, a push rod slidably connected to both the device body and the rear cover, a return spring sleeved on one end of the push rod inside the device body, and a mounting component fixedly connected to one end of the push rod inside the rear cover, with movable contact pieces fixedly connected to both sides of the mounting component.

[0011] Preferably, both sides of the rear cover are fixedly connected to stationary terminals, and the stationary terminals are provided with stationary contacts.

[0012] Preferably, a positioning rod is fixedly connected to the end of the push rod, and a limiting hole corresponding to the left plate is provided on the positioning rod.

[0013] Preferably, a push switch is fixedly connected to the bottom of the back cover, and the push switch is located directly below the mounting component.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By using a left and right heat-conducting plate, with the left heat-conducting plate made of pure copper and the right heat-conducting plate made of aluminum, the heat conduction capacity of the left heat-conducting plate is stronger than that of the right heat-conducting plate. During the triggering phase, the left heat-conducting plate is inserted into the socket and contacts the bimetallic strip, which can quickly transmit the over-temperature signal of the equipment to the bimetallic strip, realizing the sensitive triggering of the bimetallic strip, timely cutting off the circuit, and ensuring the safety of the equipment in case of over-temperature. During the reset phase, the right heat-conducting plate replaces the left heat-conducting plate and contacts the bimetallic strip. Relying on its low thermal conductivity, it can automatically filter irregular temperature fluctuations caused by heat storage in the equipment, effectively blocking the transmission of interfering temperature signals to the bimetallic strip. Only when the actual external temperature of the equipment drops below the reset threshold will the temperature signal be gradually transmitted to trigger the bimetallic strip to reset, avoiding false actions such as premature reset or repeated reset of the bimetallic strip, and ensuring the accuracy and stability of the reset action.

[0016] 2. Through the setting of wedge-shaped components and other mechanisms, when electrical equipment is damaged and the temperature rises abnormally, the bimetallic strip bends significantly after sensing the continuous high temperature. At this time, the pressure rod will drive the bimetallic strip to move down and separate from the right heat conduction plate, cutting off the continuous heat source to the bimetallic strip. This prevents the bimetallic strip from exceeding its elastic bending limit and undergoing plastic deformation, ensuring that the bimetallic strip can be reset normally when the temperature drops, thus guaranteeing its long-term performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the planar structure of the present invention;

[0019] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0020] Figure 4 This is a schematic diagram of the bottom structure of the present invention;

[0021] Figure 5 This is a partial structural diagram of the present invention. Figure 1 ;

[0022] Figure 6 This is a schematic diagram of the internal structure of the present invention. Figure 1 ;

[0023] Figure 7 for Figure 6 Enlarged view of B in the middle;

[0024] Figure 8 This is a partial structural diagram of the present invention. Figure 2 ;

[0025] Figure 9 This is a schematic diagram of the internal structure of the present invention. Figure 2 ;

[0026] Figure 10 This is a schematic diagram of the external structure of the present invention.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Main body of the equipment; 2. Rear cover; 3. Push switch; 4. Stationary terminal block; 5. Bimetallic strip; 6. Rotation box; 7. Protective box; 8. Electric telescopic rod; 9. Wedge-shaped piece; 10. Limiting hole; 11. Connecting rod; 12. Push rod; 13. Return spring; 14. Mounting part; 15. Moving contact piece; 16. Stationary contact point; 17. Tension spring; 18. Pressure rod; 19. Roller; 20. Socket; 21. Heat insulation baffle plate; 22. Side box; 23. Swing arm; 24. Left heat conduction plate; 25. Heat insulation plate; 26. Right heat conduction plate; 27. Heat insulation box; 28. Electric rod; 29. ​​Sealing plate; 30. Roller plate; 31. First tension spring; 32. Second tension spring; 33. Right plate; 34. Left plate; 35. Positioning rod; 36. Insert rod. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1 - Figure 10An automatic reset type temperature-sensitive control device includes a main body 1. A heat exchange box 6 is fixedly connected to both sides of the main body 1. An alternating heat conduction mechanism is installed inside the heat exchange box 6. The alternating heat conduction mechanism includes a heat insulation plate 25 slidably connected inside the heat exchange box 6. A left plate 34 and a right plate 33 are fixedly connected to both sides of the heat insulation plate 25, respectively. A left heat conduction sheet 24 is slidably connected to the end of the left plate 34. A first tension spring 31 is fixedly connected inside the left heat conduction sheet 24. The other end of the first tension spring 31 is fixedly connected to… A right heat-conducting plate 26 is slidably connected to the end of the right plate 33 on the outer wall of the left plate 34. A second tension spring 32 is fixedly connected inside the right heat-conducting plate 26. The other end of the second tension spring 32 is fixedly connected to the outer wall of the right plate 33. Sealing plates 29 are fixedly connected to the outer walls of both the left heat-conducting plate 24 and the right heat-conducting plate 26. A bimetallic strip 5 is installed inside the main body 1. When the over-temperature is triggered, the left heat-conducting plate 24 contacts the bimetallic strip 5. During the reset phase, the right heat-conducting plate 26 contacts the bimetallic strip 5.

[0031] The inside of the replacement box 6 is provided with an insertion port 20, which extends through the inside of the main body 1 of the equipment. A roller plate 30 is provided inside the insertion port 20. Two heat insulation boxes 27 are fixedly connected to the outer wall of the replacement box 6. An electric rod 28 is fixedly connected inside the two heat insulation boxes 27. A metal sheet protection mechanism and a temperature control mechanism are provided inside the main body 1 of the equipment.

[0032] The temperature control mechanism includes a rear cover 2 fixedly connected to the outer wall of the main body 1. A push rod 12 is slidably connected to both the main body 1 and the rear cover 2. A return spring 13 is sleeved on one end of the push rod 12 inside the main body 1. A mounting piece 14 is fixedly connected to one end of the push rod 12 inside the rear cover 2. Movable contact pieces 15 are fixedly connected to both sides of the mounting piece 14.

[0033] Both sides of the back cover 2 are fixedly connected to stationary terminals 4, and stationary contacts 16 are provided on the stationary terminals 4.

[0034] A positioning rod 35 is fixedly connected to the end of the push rod 12, and a limiting hole 10 corresponding to the left plate 34 is opened on the positioning rod 35.

[0035] A push switch 3 is fixedly connected to the bottom of the back cover 2, and the push switch 3 is located directly below the mounting part 14.

[0036] In this embodiment, during use, the main body 1 of the device can be installed into the electrical equipment. When the main body 1 of the device is working, the left heat-conducting plate 24 and the right heat-conducting plate 26 jointly sense the external temperature (it should be noted that the left heat-conducting plate 24 is made of pure copper, and the right heat-conducting plate 26 is made of aluminum; the heat conduction capacity of the left heat-conducting plate 24 is stronger than that of the right heat-conducting plate 26). In the initial state, the left heat-conducting plate 24 is inserted into the socket 20 and contacts the surface of the bimetallic strip 5. When the external temperature reaches the temperature critical value of the bimetallic strip 5, the left heat-conducting plate 24, which has stronger heat conduction capacity, quickly transfers heat to the bimetallic strip 5. After sensing the high temperature, the middle part of the bimetallic strip 5 deforms and begins to bend. The bent bimetallic strip 5 pushes the push rod 12 downward against the elastic force of the return spring 13. When the push rod 12 moves downward, it drives the mounting part 14 to move downward simultaneously, thereby causing the moving contact 15 to disengage from the stationary contact 16. After the moving contact 15 disengages from the stationary contact 16, the connection line of the electrical equipment is disconnected, completing the over-temperature trigger action. After the line is disconnected, the main body 1 of the equipment enters the reset stage. At this time, the electric rod 28 extends and pushes the heat insulation plate 25 to move away from the right heat conduction plate 26. When the heat insulation plate 25 moves, it pushes the left heat conduction plate 24 to move synchronously through the left plate 34. During the movement of the left heat conduction plate 24, its bottom contacts the side of the roller plate 30 and disengages from the inside of the socket 20 along the inclined roller plate 30. The electric rod 28 continues to extend. When the heat insulation plate 25 drives the right heat conduction plate 26 to move to the socket 20, under the tension of the second tension spring 32... The right heat-conducting plate 26 replaces the left heat-conducting plate 24 and is inserted into the socket 20, contacting the surface of the bimetallic strip 5. Thereafter, external temperature is conducted from the right heat-conducting plate 26 to the bimetallic strip 5. During the triggering phase, the left heat-conducting plate 24, with its stronger thermal conductivity, facilitates temperature conduction, quickly capturing over-temperature signals and enabling sensitive triggering of the bimetallic strip 5 for timely over-temperature protection. During the reset phase, the right heat-conducting plate 26 conducts temperature to the bimetallic strip 5. After power failure, the internal metal heating components and conductive parts retain a large amount of heat due to thermal inertia, forming heat storage. This heat storage is prone to irregular heat fluctuations due to ambient airflow and heat transfer between components. If the left heat-conducting plate 24 continues to conduct temperature to the bimetallic strip 5, it will absorb these fluctuating heat storage signals. Rapid heat conduction to the bimetallic strip 5 can easily cause it to misjudge the actual temperature of the equipment and trigger an invalid reset. However, the right heat-conducting plate 26, with its inherent low thermal conductivity, high thermal resistance, and slow temperature response, can automatically filter out small temperature fluctuations. This effectively blocks the transmission of irregular heat fluctuations caused by the equipment's heat storage to the bimetallic strip 5, preventing such interfering temperature signals from being quickly transmitted to it. Only when the actual external temperature drops below the set reset threshold can the corresponding temperature signal be gradually transmitted to the bimetallic strip 5. This avoids premature or repeated resets caused by fluctuations in the equipment's heat storage and minor temperature changes in the external environment, ensuring that the bimetallic strip 5 accurately responds only to the actual temperature changes of the equipment.To ensure the accuracy and stability of the reset action of this temperature-sensitive control device.

[0037] When the ambient temperature returns to below the reset threshold, the right heat-conducting plate 26 transmits the temperature signal to the bimetallic strip 5, causing the temperature of the bimetallic strip 5 to drop. The middle section of the bimetallic strip gradually undergoes reset deformation. When the bimetallic strip 5 returns from its bent state to its initial straight state, it no longer exerts a pushing force on the push rod 12. At this time, the push rod 12 returns to its initial position under the elastic force of the reset spring 13. When the push rod 12 resets, it drives the moving contact 15 to re-contact the stationary contact 16 via the mounting piece 14. The electrical wiring inside the device is then reconnected. After the wiring is connected, the electric rod 28 retracts and returns to its initial position. When the heat insulation plate 25 resets under the action of the electric rod 28, it pulls the right heat-conducting plate 26, which is inserted into the socket 20, to the right. At this time, the bottom of the right heat-conducting plate 26 will detach from the socket 20 along the inclined edge of the roller plate 30. The electric rod 28 continues... When the left heat-conducting plate 24 moves to the socket 20 along with the heat insulation plate 25, it is re-inserted into the socket 20 under the pulling force of the first tension spring 31, and the temperature is transferred to the bimetallic strip 5 again, ensuring the temperature sensing sensitivity of the device during the triggering stage. (It should be noted that, regardless of whether the left heat-conducting plate 24 or the right heat-conducting plate 26 is inserted into the socket 20, the sealing plate 29 at its end will block the outside of the socket 20 to prevent heat from leaking out through the gaps in the socket 20, which would prevent the bimetallic strip 5 from accurately sensing the actual conduction temperature. The switching box 6 and the heat insulation plate 25 are both made of heat-insulating ceramic. When the left heat-conducting plate 24 and the right heat-conducting plate 26 sense the external temperature, the heat insulation plate 25 can form a barrier to prevent mutual thermal radiation interference between the two during the process of the left heat-conducting plate 24 and the right heat-conducting plate 26 conducting temperature to the bimetallic strip 5.)

[0038] Example 2: Please refer to Figure 1 - Figure 10 This embodiment further describes Example 1. The metal sheet protection mechanism includes protective boxes 7 fixedly connected to both sides of the main body 1. Pressure rods 18 are slidably connected through both protective boxes 7. One end of the pressure rod 18 located outside the protective box 7 is fixedly connected to the outer wall of the bimetallic strip 5. The other end of the pressure rod 18 located inside the protective box 7 is rotatably connected to a roller 19. A tension spring 17 is fixedly connected to the outer wall of the bimetallic strip 5. The end of the tension spring 17 away from the bimetallic strip 5 is connected to the outer wall of the protective box 7.

[0039] Both sides of the main body 1 are fixedly connected to side boxes 22. Both sides of the side boxes 22 are slidably connected to heat insulation baffles 21. A swing arm 23 is rotatably connected to the heat insulation baffles 21. The end of the swing arm 23 away from the heat insulation baffles 21 is rotatably connected to the outer wall of the pressure rod 18. A through groove corresponding to the swing arm 23 is opened at the bottom of the side box 22.

[0040] An electric telescopic rod 8 is fixedly connected to one of the outer walls of the two protective boxes 7. Wedge-shaped pieces 9 are slidably connected inside the two protective boxes 7. A connecting rod 11 is fixedly connected between the two wedge-shaped pieces 9. The end of the electric telescopic rod 8 is fixedly connected to one of the outer walls of the two wedge-shaped pieces 9. An insert rod 36 is fixedly connected to the outer wall of the connecting rod 11.

[0041] In this embodiment, during the reset phase, if electrical equipment malfunctions and causes an abnormal temperature rise, the intense heat will be transferred from the right heat-conducting plate 26 to the bimetallic strip 5. Upon sensing the sustained high temperature, the bimetallic strip 5 undergoes a significant bending deformation. This deformation continuously pushes the push rod 12 downwards until the mounting component 14 contacts the push switch 3. After contact, the mounting component 14 controls the retraction of the electric telescopic rod 8 (this is prior art and will not be elaborated further). When the electric telescopic rod 8 retracts, it pulls the two wedge-shaped pieces 9 towards the electric telescopic rod 8. After the two wedge-shaped pieces 9 move, the roller 19 at the bottom of the pressure rod 18 disengages from contact with the highest point of the wedge-shaped piece 9 and instead contacts the lowest point of the inclined side of the wedge-shaped piece 9. After the wedge 9 loses its lifting effect, the bimetallic strip 5 moves downward toward the protective box 7 under the tension of the tension spring 17, causing the bimetallic strip 5 to separate from the right heat-conducting plate 26, cutting off the heat source from continuously transferring heat to the bimetallic strip 5, preventing the bimetallic strip 5 from being subjected to high temperature and exceeding the elastic bending limit to cause irreversible plastic deformation, ensuring that the bimetallic strip 5 can return to its initial flat state when the temperature drops, and ensuring the performance of the bimetallic strip 5. During the process of the pressure rod 18 moving the bimetallic strip 5 downward, the heat insulation baffle 21 will slide out from the inside of the side box 22 through the swing arm 23, forming a shield on the bottom of the socket 20. The heat insulation baffle 21 is made of heat-insulating ceramic, which can achieve effective heat insulation and prevent the heat of the right heat-conducting plate 26 from being conducted to the inside of the main body 1 of the equipment through the socket 20 by heat radiation.

[0042] When the bimetallic strip 5 is subjected to severe high temperature and undergoes a significant bend, pushing the push rod 12 downward, it simultaneously causes the positioning rod 35 to move downward. When the push rod 12 moves down to the point where the mounting part 14 contacts the push switch 3, the limiting hole 10 on the positioning rod 35 is located directly to the side of the insertion rod 36. When the electric telescopic rod 8 retracts and moves the two wedge-shaped parts 9, it pulls the insertion rod 36 into the limiting hole 10 through the connecting rod 11. After the insertion rod 36 is inserted into the limiting hole 10, it locks the push rod 12. Even if the bimetallic strip 5 cools down due to natural heat dissipation of the equipment body 1 and completes its reset deformation, the push rod 12 will not move with the reset of the bimetallic strip 5. The electrical connection line of the equipment remains disconnected to prevent the equipment from overheating and being damaged when the external environment is still at severe high temperature. The retraction of the electric telescopic rod 8 causes the bimetallic strip 5 to move downward and the push rod 12 to move downward. After locking, its built-in signal transmitter sends out a fault warning signal to remind the operator that the equipment has suffered a severe overheating fault due to damage and to carry out timely repairs (this is existing technology and will not be elaborated further). After the operator completes the repairs, the internal temperature of the electrical equipment returns to normal, the electric telescopic rod 8 extends and returns to its initial position, and the two wedges 9 reset to form a lifting effect. The pressure rod 18 drives the bimetallic strip 5 to move upward and return to its normal working position. When the pressure rod 18 moves upward and resets, the heat insulation baffle 21 is pushed back into the side box 22 to return to its initial state through the action of the swing arm 23. The corresponding connecting rod 11 inserts the rod 36 and moves with the two wedges 9 to disengage from the limiting hole 10 on the positioning rod 35, releasing the lock on the push rod 12, allowing the push rod 12 to move freely, ensuring that the device can subsequently achieve normal circuit conduction.

[0043] It should be noted that the thermal conductivity of the right heat conductor 26 is designed to be moderately weaker than that of the left heat conductor 24. It is not a type with extremely poor thermal conductivity. Under the same temperature environment, the right heat conductor 26 can reach the same temperature as the left heat conductor 24 within a five-second range.

[0044] It should be noted that the spring force of the return spring 13 is extremely weak, and it only provides a reset function. The spring force of the return spring 13 is less than the deformation driving force of the bimetallic strip 5.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic reset type temperature-sensitive control device, comprising a main body (1), characterized in that, The main body (1) of the device is fixedly connected to both sides of a heat exchange box (6). The heat exchange box (6) is provided with an alternating heat conduction mechanism. The alternating heat conduction mechanism includes a heat insulation plate (25) slidably connected inside the heat exchange box (6). A left plate (34) and a right plate (33) are fixedly connected to both sides of the heat insulation plate (25). A left heat conduction sheet (24) is slidably connected to the end of the left plate (34). A first tension spring (31) is fixedly connected inside the left heat conduction sheet (24). The other end of the first tension spring (31) is fixedly connected to the outer wall of the left plate (34). On the right plate (33), a right heat-conducting plate (26) is slidably connected to the end of the right plate (33). A second tension spring (32) is fixedly connected inside the right heat-conducting plate (26). The other end of the second tension spring (32) is fixedly connected to the outer wall of the right plate (33). A sealing plate (29) is fixedly connected to the outer wall of both the left heat-conducting plate (24) and the right heat-conducting plate (26). A bimetallic strip (5) is installed inside the main body (1). When the over-temperature is triggered, the left heat-conducting plate (24) contacts the bimetallic strip (5). During the reset phase, the right heat-conducting plate (26) contacts the bimetallic strip (5).

2. The automatic reset type temperature-sensitive control device according to claim 1, characterized in that: The inside of the replacement box (6) is provided with an insertion port (20), which extends through the inside of the main body of the equipment (1). A roller plate (30) is provided inside the insertion port (20). Two heat insulation boxes (27) are fixedly connected to the outer wall of the replacement box (6). An electric rod (28) is fixedly connected inside the two heat insulation boxes (27). A metal sheet protection mechanism and a temperature control mechanism are provided inside the main body of the equipment (1).

3. The automatic reset type temperature-sensitive control device according to claim 2, characterized in that: The metal sheet protection mechanism includes protective boxes (7) fixedly connected to both sides of the main body (1) of the equipment. Each protective box (7) has a pressure rod (18) slidably connected through it. One end of the pressure rod (18) located outside the protective box (7) is fixedly connected to the outer wall of the bimetallic strip (5). The other end of the pressure rod (18) located inside the protective box (7) is rotatably connected to a roller (19). A tension spring (17) is fixedly connected to the outer wall of the bimetallic strip (5). The end of the tension spring (17) away from the bimetallic strip (5) is connected to the outer wall of the protective box (7).

4. The automatic reset type temperature-sensitive control device according to claim 1, characterized in that: The main body (1) of the equipment is fixedly connected to two side boxes (22) on both sides. The inside of the two side boxes (22) is slidably connected to heat insulation baffles (21). A swing arm (23) is rotatably connected to the heat insulation baffles (21). The end of the swing arm (23) away from the heat insulation baffles (21) is rotatably connected to the outer wall of the pressure rod (18). The bottom of the side box (22) is provided with a through groove corresponding to the swing arm (23).

5. The automatic reset type temperature-sensitive control device according to claim 3, characterized in that: An electric telescopic rod (8) is fixedly connected to one of the outer walls of the two protective boxes (7). Wedge-shaped pieces (9) are slidably connected inside the two protective boxes (7). A connecting rod (11) is fixedly connected between the two wedge-shaped pieces (9). The end of the electric telescopic rod (8) is fixedly connected to one of the outer walls of the two wedge-shaped pieces (9). An insert rod (36) is fixedly connected to the outer wall of the connecting rod (11).

6. The automatic reset type temperature-sensitive control device according to claim 2, characterized in that: The temperature control mechanism includes a rear cover (2) fixedly connected to the outer wall of the main body (1). A push rod (12) is slidably connected to both the main body (1) and the rear cover (2). A return spring (13) is sleeved on one end of the push rod (12) inside the main body (1). An installation part (14) is fixedly connected to one end of the push rod (12) inside the rear cover (2). Movable contact pieces (15) are fixedly connected to both sides of the installation part (14).

7. The automatic reset type temperature-sensitive control device according to claim 6, characterized in that: Both sides of the rear cover (2) are fixedly connected to static terminals (4), and static contacts (16) are provided on the static terminals (4).

8. The automatic reset type temperature-sensitive control device according to claim 6, characterized in that: The end of the push rod (12) is fixedly connected to a positioning rod (35), and the positioning rod (35) has a limiting hole (10) corresponding to the left plate (34).

9. The automatic reset type temperature-sensitive control device according to claim 6, characterized in that: A push switch (3) is fixedly connected to the bottom of the back cover (2), and the push switch (3) is located directly below the mounting piece (14).

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