Low-voltage circuit breaker opening and closing device and low-voltage switch cabinet

Abstract

The invention relates to the technical field of circuit breakers, and discloses a low-voltage circuit breaker opening and closing device and a low-voltage switchgear. The low-voltage circuit breaker opening and closing device comprises a circuit breaker and an opening and closing main body installed on the circuit breaker, and further comprises a protection box installed on the side wall of the circuit breaker; a plurality of placing plates are vertically arranged in the two cavities of the drying box in a sliding mode, a plurality of grooves of hemispherical structures are formed in the top faces and the bottom faces of the placing plates, every two vertically-adjacent grooves communicate with each other, and drying balls are arranged in the grooves located in the top faces of the placing plates. And the drying box is driven to reciprocate by virtue of the power of the closing action, so that the switching operation of the two cavities is realized. In the cavity communicated with the air inlet and the guide pipe, the drying ball can efficiently adsorb moisture entering the air; and the drying balls saturated in adsorption in the other cavity are dehumidified and dried by utilizing the heat generated during working of the electrical elements, so that the circulating use of the drying balls is realized.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a low-voltage circuit breaker opening and closing device and a low-voltage switchgear. Background Technology

[0002] Low-voltage circuit breakers are the core protection and control components of low-voltage power distribution systems. Their core function is to reliably connect and disconnect circuits, and to provide rapid protection and isolation under fault conditions such as overload and short circuits, through their opening and closing devices. As power equipment expands into harsh environments such as offshore wind power platforms, coastal chemical plants, underground utility tunnels, and high-temperature, high-humidity tropical regions, the long-term environmental adaptability deficiencies of the opening and closing devices in existing circuit breakers are becoming increasingly prominent. These problems do not stem from basic breaking performance, but rather focus on the long-term operational reliability and protection accuracy maintenance capabilities of the mechanism, directly affecting the safety margin and service life of the power distribution system.

[0003] While the structure of circuit breaker opening and closing devices is relatively mature, their environmental adaptability is a significant weakness in harsh environments such as high humidity and large temperature differences. To prevent internal condensation, existing solutions often involve simple vents or static desiccant packs on the outer casing. While vents can balance air pressure, they cannot prevent moisture intrusion and can even become condensation channels in environments with drastic temperature differences. Static desiccant packs have limited adsorption capacity and become completely ineffective once saturated, requiring regular manual inspection and replacement, which is inconvenient and unreliable. In long-term high-humidity environments, condensation remains a problem, easily leading to corrosion of internal metal components, lubricant failure, and consequently, jamming of the operating mechanism, increased tripping force, or even failure to operate. Simultaneously, condensation droplets reduce the surface resistance of insulating components, increasing the risk of creepage and seriously threatening electrical safety. Summary of the Invention

[0004] In view of the problem that existing technologies have static desiccant packs that are difficult to meet the requirements of long-term humid environments, which may lead to failure and damage of internal mechanisms, a low-voltage circuit breaker opening and closing device and a low-voltage switch cabinet are proposed.

[0005] Its purpose is to use the power of opening and closing the switch to move the drying chamber, so that the desiccant can move into the heating cavity to remove moisture after it is saturated, and achieve repeated use.

[0006] The technical solution of this invention is a low-voltage circuit breaker opening and closing device, including a circuit breaker and an opening and closing body installed on the circuit breaker, and a protective box installed on the side wall of the circuit breaker. A drying box is laterally slidably arranged inside the protective box. The drying box has a H-shaped cross-section. Multiple placement plates are vertically slidably arranged in both cavities of the drying box. Multiple hemispherical grooves are formed on the top and bottom surfaces of the placement plates. Two adjacent grooves are connected, and a drying ball is placed in the groove on the top surface of the placement plate. An air inlet is provided at the bottom of the protective box. An L-shaped guide tube is fixedly connected inside the drying chamber. One of the chambers of the drying chamber is connected to the air inlet and the guide tube on both sides, respectively. An air supply pipe is rotatably connected to the lower part of the guide tube. A lever is fixedly connected to the outer wall of the end of the air supply pipe facing the drying chamber. A guide groove is fixedly connected to the side wall of the drying chamber. The lever and the guide groove are slidably engaged. The other end of the air supply pipe extends through the main body of the opening and closing switch and is connected to the drive shaft of the main body of the opening and closing switch. Multiple air outlets are opened at both ends of the air supply pipe. The air outlets at both ends of the air supply pipe are respectively located inside the guide tube and inside the main body of the opening and closing switch.

[0007] Heat-conducting plates are provided on both sides of the moving direction of the drying chamber. The heat-conducting plates are fixedly installed on the side wall of the protective box. Heat-conducting sheets are fixedly connected to the heat-conducting plates. One end of the heat-conducting sheet is fixedly inserted into the main body of the switch and fixedly connected to a heat-absorbing plate. The heat-absorbing plate is located on the outside of the electrical components.

[0008] Furthermore, multiple support plates are fixed in a ring at equal intervals in the groove on the top surface of the placement plate, the drying ball abuts against the support plates, and the support plates are inclined.

[0009] Furthermore, a dustproof net is fixedly connected inside the air inlet.

[0010] Furthermore, a one-way bearing is installed at one end of the gas supply pipe inside the control body. A driven gear is fixedly connected to the one-way bearing. A driving gear is meshed with one side of the driven gear. The driving gear is fixedly sleeved on the drive shaft wall inside the control body.

[0011] Furthermore, a sealing sleeve is fixedly fitted onto the outer wall of the gas pipeline, and a support base is rotatably connected to the outside of the sealing sleeve. The support base is fixedly installed on the side wall of the circuit breaker.

[0012] Furthermore, two pull ropes are provided inside the drying chamber, the placement plate is connected and fixed to the pull ropes, the upper end of the pull ropes extends movably through to the outside of the drying chamber and is fixedly connected to a slider, and multiple sliding grooves are fixedly connected to the outer wall of the drying chamber, and the slider is slidably connected to the corresponding sliding groove.

[0013] Two guide plates are fixedly connected to the upper part of the guide tube. The bottom of the guide plate has a guide surface with a trapezoidal structure, and the guide surface slides in contact with the corresponding slider.

[0014] Furthermore, a placement groove is provided on the top surface of the placement plate at the location of the pull rope.

[0015] Furthermore, the protective box has pressure relief holes on both sides of the sliding direction of the drying box. An elastic piece is fixedly connected to the top surface of the pressure relief hole. The elastic piece is inclined and its lower end abuts against the pressure relief hole.

[0016] The technical solution of the present invention also provides a low-voltage switchgear, including a low-voltage switchgear housing and a mounting bracket disposed within the low-voltage switchgear housing. The low-voltage switchgear housing is provided with any of the aforementioned low-voltage circuit breaker opening and closing devices. The low-voltage circuit breaker opening and closing devices are fixedly installed on the mounting bracket. The opening and closing main body is electrically connected to the control circuit of the low-voltage switchgear.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The closing action drives the drying chamber to reciprocate, enabling the switching of the two chambers. In the chamber connected to the air inlet and guide pipe, the drying balls efficiently adsorb moisture from the incoming air, ensuring the internal air pressure balance of the circuit breaker and preventing moisture from entering the opening and closing mechanism. Simultaneously, the heat generated by the electrical components during operation dehumidifies and dries the saturated drying balls in the other chamber, thus enabling the drying balls to be used repeatedly.

[0019] 2. The slider and guide plate work together to precisely control the lifting and lowering of the placement plates. When two adjacent placement plates are in contact, the vertically arranged grooves can be spliced ​​to form a continuous spherical channel, allowing the airflow to fully contact the drying balls as it flows through the channel, greatly improving the moisture adsorption effect. When two adjacent placement plates are unfolded, the placement plates can quickly absorb the heat transferred by the heat-conducting plate and evenly heat the space above and below them, allowing the heat to fully cover all the drying balls, thereby achieving comprehensive and efficient heating and regeneration of the drying balls.

[0020] 3. The support plate not only maintains a uniform distance between the drying ball and the groove, but also changes the gas flow direction, breaks the straight path of airflow, and increases the contact area and contact time between the air and the drying ball with the uniform gap, ensuring that the moisture is fully adsorbed by the drying ball, and further improving the dehumidification effect on the air. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the low-voltage circuit breaker opening and closing device of the present invention.

[0022] Figure 2 This is a schematic diagram of the protective box and gas pipeline structure of the low-voltage circuit breaker opening and closing device of the present invention.

[0023] Figure 3 This is a schematic diagram of the internal structure of the protective box of the low-voltage circuit breaker opening and closing device of the present invention;

[0024] Figure 4 This is a schematic cross-sectional view of the protective box and drying box structure of the low-voltage circuit breaker opening and closing device of the present invention.

[0025] Figure 5 This is a schematic cross-sectional view of the placement plate structure of the low-voltage circuit breaker opening and closing device of the present invention;

[0026] Figure 6 This is a schematic cross-sectional view of the drying box and guide tube structure of the low-voltage circuit breaker opening and closing device of the present invention.

[0027] Figure 7 This is a schematic diagram of the lever and slide groove structure of the low-voltage circuit breaker opening and closing device of the present invention.

[0028] Figure 8 This is a schematic diagram of the heat-conducting plate and heat-absorbing plate structure of the low-voltage circuit breaker opening and closing device of the present invention.

[0029] Figure 9 The low-voltage circuit breaker opening and closing device of the present invention Figure 8 Enlarged cross-sectional view of the structure at point A in the middle;

[0030] Figure 10 This is a schematic diagram of the pull rope and slider structure of the low-voltage circuit breaker opening and closing device of the present invention;

[0031] Figure 11 This is a schematic diagram of the low-voltage switchgear structure of the present invention;

[0032] Figure 12 This is a schematic diagram of the main drive shaft and gas pipeline structure of the opening and closing main body of the present invention.

[0033] In the picture:

[0034] 1. Main body for opening and closing the switch; 2. Protective box; 3. Drying box; 4. Placement plate; 5. Groove; 6. Drying ball; 7. Support plate; 8. Guide tube; 9. Air supply pipe; 10. Lever; 11. Guide groove; 12. Air inlet; 13. Dustproof net; 14. Air outlet; 15. Heat-conducting plate; 16. Heat-conducting sheet; 17. Heat-absorbing plate; 18. One-way bearing; 19. Driven gear; 20. Driven gear; 21. Sealing sleeve; 22. Support base; 23. Slider; 24. Slide groove; 25. Guide plate; 26. Guide surface; 27. Placement groove; 28. Pressure relief hole; 29. ​​Elastic sheet; 30. Low-voltage switch cabinet housing; 31. Pull rope. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Example 1, referring to Figures 1-8 This is the first embodiment of the present invention, providing a low-voltage circuit breaker opening and closing device, including a circuit breaker and an opening and closing body 1 installed on the circuit breaker, and a protective box 2 installed on the side wall of the circuit breaker. A drying box 3 is laterally slidably arranged inside the protective box 2. The drying box 3 has a H-shaped cross-section. Multiple placement plates 4 are vertically slidably arranged in both cavities of the drying box 3. Multiple hemispherical grooves 5 are formed on the top and bottom surfaces of the placement plates 4. Two adjacent grooves 5 are connected, and a drying ball 6 is arranged in the groove 5 on the top surface of the placement plate 4. An air inlet 12 is formed at the bottom of the protective box 2. An L-shaped guide tube 8 is fixedly connected inside the protective box 2. One side of one cavity of the drying box 3 is connected to the air inlet 12 and the guide tube 8, respectively, and the lower part of the guide tube 8 rotates. A gas supply pipe 9 is dynamically connected. A lever 10 is fixedly connected to the outer wall of one end of the gas supply pipe 9 facing the drying chamber 3. A guide groove 11 is fixedly connected to the side wall of the drying chamber 3. The lever 10 and the guide groove 11 are slidably engaged. The other end of the gas supply pipe 9 is movably inserted into the opening and closing main body 1 and is connected to the drive shaft of the opening and closing main body 1. Multiple air outlets 14 are opened at both ends of the gas supply pipe 9. The air outlets 14 at both ends of the gas supply pipe 9 are respectively located in the guide pipe 8 and the opening and closing main body 1. Heat-conducting plates 15 are provided on both sides of the moving direction of the drying chamber 3. The heat-conducting plates 15 are fixedly installed on the side wall of the protective box 2. Heat-conducting sheets 16 are fixedly connected to the heat-conducting plates 15. One end of the heat-conducting sheet 16 is fixedly inserted into the opening and closing main body 1 and is fixedly connected to a heat-absorbing plate 17. The heat-absorbing plate 17 is located outside the electrical components.

[0037] Specifically, outside air enters one of the chambers of the drying chamber 3 through the air inlet 12. After the moisture is absorbed by the drying balls 6 on the placement plate 4, the dry air enters the opening and closing main body 1 through the guide pipe 8 and the air supply pipe 9 in sequence, realizing the air pressure balance inside and outside the opening and closing main body 1 and effectively preventing moisture intrusion and condensation. When the opening and closing main body 1 performs the closing operation, its drive shaft rotates, which drives the air supply pipe 9 to rotate synchronously. The lever 10 on the air supply pipe 9 slides with the guide groove 11 of the drying chamber 3, thereby driving the drying chamber 3 to move laterally along the protective box 2. The device moves, switching the unused chamber of the drying chamber 3 to a working position connected to the air inlet 12 and guide pipe 8. Simultaneously, the chamber that originally absorbed moisture moves to be in contact with the corresponding heat-conducting plate 15. The heat generated by the electrical components within the opening / closing main body 1 is absorbed by the heat-absorbing plate 17 and transferred to the heat-conducting plate 15 via the heat-conducting sheet 16. The heat-conducting plate 15 then conducts the heat to the corresponding drying chamber 3, heating and regenerating the drying balls 6 within the chamber, quickly expelling the absorbed moisture to restore its moisture absorption capacity. This cycle achieves continuous drying. The synergistic effect of the heat-conducting and drying structures solves the problems of manual replacement and low reliability associated with traditional static drying methods. It also utilizes the device's own heat to regenerate the drying medium while maintaining the internal and external air pressure balance of the opening / closing main body 1. Combined with the heat dissipation function, this effectively prevents corrosion of metal parts, lubricant failure, and insulation creepage risks, significantly improving the environmental adaptability and operational reliability of the opening / closing device.

[0038] Among them, the drying oven 3, the placement plate 4, the heat-conducting plate 15, the heat-conducting sheet 16, and the heat-absorbing plate 17 are all made of metal with excellent thermal conductivity, ensuring that the heat inside the opening and closing main body 1 can be effectively transferred to the protective box 2 to achieve the heating and drying effect of the drying ball 6.

[0039] Reference Figure 4 , Figure 5 Multiple support plates 7 are fixed in a ring at equal intervals in the groove 5 on the top surface of the placement plate 4. The drying ball 6 abuts against the support plates 7, and the support plates 7 are inclined.

[0040] Specifically, the support plate 7 provides stable support for the drying ball 6, creating a uniform gap between the drying ball 6 and the inner wall of the groove 5. At the same time, the two vertically adjacent placement plates 4 fit together, allowing the vertically arranged grooves 5 to precisely align and form a continuous spherical channel. After the outside air enters the drying chamber 3, it flows along the spherical channel. The inclined support plate 7 not only changes the direction of gas flow and breaks the straight path of airflow, but also increases the contact area and contact time between the air and the drying ball 6 with the uniform gap, ensuring that the moisture is fully adsorbed by the drying ball 6, significantly improving the drying efficiency and drying effect.

[0041] Reference Figure 8 A dustproof net 13 is fixedly connected inside the air inlet 12.

[0042] Specifically, a dustproof net 13 is fixedly installed inside the air inlet 12. The dustproof net 13 can effectively block dust, particulate matter and other debris in the outside air from entering the drying chamber 3 and the opening and closing main body 1 with the airflow, so as to avoid debris from adhering to the surface of the drying ball 6 and affecting the moisture absorption effect. At the same time, it prevents debris from intruding into the mechanical structure and electrical components inside the opening and closing main body 1, reducing the risk of component wear, jamming and circuit failure.

[0043] Reference Figure 7 One end of the gas supply pipe 9 located inside the opening and closing main body 1 is equipped with a one-way bearing 18. A driven gear 19 is fixedly connected to the one-way bearing 18. A driving gear 20 is meshed on one side of the driven gear 19. The driving gear 20 is fixedly sleeved on the drive main shaft wall inside the opening and closing main body 1.

[0044] Specifically, when the drive spindle rotates in the forward direction, it drives the drive gear 20 to rotate synchronously. Through the meshing transmission between the drive gear 20 and the driven gear 19, the air supply pipe 9 is driven to rotate accordingly. In turn, the drying chamber 3 is moved through the cooperation of the lever 10 and the guide groove 11. The one-way bearing 18 can limit the reverse rotation of the driven gear 19, effectively preventing the air supply pipe 9 from rotating in the reverse direction when the drive spindle rotates in the reverse direction. This ensures that the lever 10 always maintains a one-way rotation trend, thereby driving the drying chamber 3 to move stably in a cyclical manner and ensuring the orderly operation of the drying chamber switching and the regeneration process of the drying ball 6.

[0045] It should be noted that when the main body 1 of the circuit breaker is closed, the operating mechanism or the motor must be manually driven to rotate the drive shaft to store the main spring. After the closing button is pressed, the main spring drives the drive shaft to rotate in the opposite direction, causing the contacts to make contact and realize the power-on function. The one-way bearing 18 is set so that the drive shaft drives the air supply pipe 9 to rotate only in a certain fixed direction. At the same time, the transmission ratio of the drive gear 20 and the driven gear 19 is matched so that the air supply pipe 9 rotates half a turn each time the closing operation is performed. The lever 10 and the guide groove 11 cooperate to make the drying box 3 move once, completing the replacement of the cavity.

[0046] Reference Figure 7 A sealing sleeve 21 is fixedly sleeved on the outer wall of the gas pipeline 9. A support seat 22 is rotatably connected to the outside of the sealing sleeve 21. The support seat 22 is fixedly installed on the side wall of the circuit breaker.

[0047] Specifically, the sealing sleeve 21 cooperates with the support seat 22 to ensure the sealing of the circuit breaker while the gas pipeline 9 rotates, and at the same time provides a support point for the rotation of the gas pipeline 9 to ensure its stable axial rotation.

[0048] Example 2, refer to Figure 10This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: two pull ropes 31 are provided inside the drying chamber 3, the placement plate 4 is connected and fixed to the pull ropes 31, the upper end of the pull ropes 31 extends movably through to the outside of the drying chamber 3 and is fixedly connected to a slider 23, multiple sliding grooves 24 are fixedly connected to the outer wall of the drying chamber 3, and the slider 23 is slidably connected to the corresponding sliding groove 24; two guide plates 25 are fixedly connected to the upper part of the guide tube 8, and the bottom of the guide plate 25 is provided with a guide surface 26 with a trapezoidal structure, and the guide surface 26 is in slidable contact with the corresponding slider 23.

[0049] Specifically, during the movement of the drying chamber 3, the slider 23 on the outside of the cavity that is not connected to the guide tube 8 will slide into contact with the trapezoidal guide surface 26 at the bottom of the guide plate 25, causing the slider 23 to slide down along the corresponding slide groove 24, thereby pulling the pull rope 31, so that the vertically arranged placement plates 4 in the cavity will unfold synchronously and maintain an equal spacing. When the cavity moves to fit with the corresponding heat-conducting plate 15, heat can be quickly transferred to each placement plate 4. The gap between adjacent placement plates 4 can accelerate heat transfer, allowing heat to evenly cover all the drying balls 6, realizing comprehensive and efficient heating and regeneration of the drying balls 6, quickly expelling the adsorbed moisture to restore the moisture absorption performance. At the same time, the equally spaced unfolding structure design avoids the problem of uneven heating caused by the stacking of drying balls 6, significantly improving the regeneration efficiency and recycling effect of the drying balls 6, and ensuring the stability of the device's long-term moisture protection.

[0050] Reference Figure 10 The top surface of the placement plate 4 has a placement groove 27 located at the pull rope 31.

[0051] Specifically, a placement groove 27 is provided at the location where the pull rope 31 is placed on the top surface of the placement plate 4. When two adjacent placement plates 4 are attached to each other, the excess pull rope 31 can be stored in the placement groove 27, thereby ensuring that the placement plates 4 are tightly attached to each other, so that the vertically arranged grooves 5 can be precisely aligned to form a continuous and unobstructed spherical channel, ensuring that the airflow passes smoothly and makes full contact with the drying ball 6.

[0052] Reference Figure 7 , Figure 8 , Figure 9 The protective box 2 is provided with pressure relief holes 28 on both sides of the sliding direction of the drying box 3. The top surface of the pressure relief hole 28 is fixedly connected with an elastic piece 29. The elastic piece 29 is inclined and its lower end abuts against the pressure relief hole 28.

[0053] Specifically, when the air pressure inside the protective box 2 increases due to the release of moisture by the drying ball 6 during heating and regeneration, the inclined elastic plate 29 on the top surface of the pressure relief hole 28 on both sides of the protective box 2 will deform under the action of air pressure, thereby opening the pressure relief channel, so that the excess pressure inside the protective box 2 and the moisture desorbed by the drying ball 6 can be smoothly discharged through the pressure relief hole 28, ensuring the stability of the air pressure inside the protective box 2.

[0054] The technical solution of the present invention also provides a low-voltage switchgear, such as... Figure 11 It includes a low-voltage switchgear housing 30 and a mounting bracket installed inside the low-voltage switchgear housing 30. A low-voltage circuit breaker opening and closing device is installed inside the low-voltage switchgear housing 30. The low-voltage circuit breaker opening and closing device is fixedly installed on the mounting bracket. The opening and closing body 1 is electrically connected to the control circuit of the low-voltage switchgear.

[0055] In conjunction with embodiments 1-2, this low-voltage circuit breaker opening and closing device and low-voltage switchgear achieve efficient moisture protection for the opening and closing body 1 through a coordinated design of drying regeneration, heat utilization, and air pressure balance. Specifically, outside air is filtered by the dustproof net 13 of the air inlet 12 and enters one of the chambers of the drying chamber 3. Moisture is fully adsorbed by the drying balls 6 in the groove 5. The dried air is then sent into the opening and closing body 1 through the guide pipe 8, the air supply pipe 9, and the air outlet 14 to maintain the internal and external air pressure balance. When the opening and closing body 1 is closed, the drive shaft drives the air supply pipe 9 to rotate unidirectionally. The lever 10 and the guide groove 11 cooperate to push the drying chamber 3 to move laterally, switching to another drying chamber for continuous dehumidification. Meanwhile, the heat generated by the electrical components inside the main body 1 of the circuit breaker is transferred to the heat-conducting plate 15 through the heat-absorbing plate 17 and the heat-conducting plate 16. In the original drying chamber that is in contact with the heat-conducting plate 15, the slider 23 slides along the guide surface 26 of the guide plate 25 and drives the placement plate 4 to unfold at equal intervals through the pull rope 31. The heat evenly heats the drying ball 6 to achieve regeneration, and excess moisture and pressure are discharged through the elastic plate 29 of the pressure relief hole 28.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A low-voltage circuit breaker opening and closing device, comprising a circuit breaker and an opening and closing body mounted on the circuit breaker, characterized in that, It also includes a protective box installed on the side wall of the circuit breaker. A drying chamber is laterally slidable inside the protective box. The drying chamber has a H-shaped cross-section. Multiple placement plates are vertically slidable in both cavities of the drying chamber. Multiple hemispherical grooves are formed on the top and bottom surfaces of each placement plate. Adjacent grooves are connected, and a drying ball is placed in the groove on the top surface of the placement plate. An air inlet is provided at the bottom of the protective box. An L-shaped guide pipe is fixedly connected inside the protective box. The drying chamber... One cavity is connected to an air inlet and a guide pipe on both sides, and the lower part of the guide pipe is rotatably connected to an air supply pipe. A lever is fixedly connected to the outer wall of the end of the air supply pipe facing the drying box. A guide groove is fixedly connected to the side wall of the drying box. The lever and the guide groove are slidably engaged. The other end of the air supply pipe extends through the main body of the opening and closing switch and is connected to the drive shaft of the main body of the opening and closing switch. Multiple air outlets are opened at both ends of the air supply pipe. The air outlets at both ends of the air supply pipe are respectively located in the guide pipe and in the main body of the opening and closing switch. Heat-conducting plates are provided on both sides of the moving direction of the drying chamber. The heat-conducting plates are fixedly installed on the side wall of the protective box. Heat-conducting sheets are fixedly connected to the heat-conducting plates. One end of the heat-conducting sheet is fixedly inserted into the main body of the switch and fixedly connected to a heat-absorbing plate. The heat-absorbing plate is located on the outside of the electrical components.

2. The low-voltage circuit breaker opening and closing device according to claim 1, characterized in that, Multiple support plates are fixed in a ring at equal intervals in the groove on the top surface of the placement plate. The drying ball abuts against the support plates, and the support plates are inclined.

3. The low-voltage circuit breaker opening and closing device according to claim 1, characterized in that, A dustproof mesh is fixedly connected inside the air inlet.

4. The low-voltage circuit breaker opening and closing device according to claim 1, characterized in that, One end of the gas supply pipe located inside the control body is equipped with a one-way bearing. A driven gear is fixedly connected to the one-way bearing. A driving gear is meshed with one side of the driven gear. The driving gear is fixedly sleeved on the drive shaft wall inside the control body.

5. The low-voltage circuit breaker opening and closing device according to claim 1, characterized in that, A sealing sleeve is fixedly fitted onto the outer wall of the gas pipeline, and a support base is rotatably connected to the outside of the sealing sleeve. The support base is fixedly installed on the side wall of the circuit breaker.

6. The low-voltage circuit breaker opening and closing device according to claim 1, characterized in that, The drying chamber is equipped with two pull ropes. The placement plate is connected and fixed to the pull ropes. The upper end of the pull ropes extends through to the outside of the drying chamber and is fixedly connected to a slider. The outer wall of the drying chamber is fixedly connected with multiple sliding grooves. The slider is slidably connected to the corresponding sliding groove. Two guide plates are fixedly connected to the upper part of the guide tube. The bottom of the guide plate has a guide surface with a trapezoidal structure, and the guide surface slides in contact with the corresponding slider.

7. The low-voltage circuit breaker opening and closing device according to claim 6, characterized in that, The top surface of the placement plate has a placement groove located at the pull rope.

8. The low-voltage circuit breaker opening and closing device according to claim 1, characterized in that, Pressure relief holes are provided on both sides of the protective box located in the sliding direction of the drying box. An elastic piece is fixedly connected to the top surface of the pressure relief hole. The elastic piece is inclined and its lower end abuts against the pressure relief hole.

9. A low-voltage switchgear, characterized in that, The device includes a low-voltage switchgear housing and a mounting bracket disposed within the low-voltage switchgear housing. The low-voltage switchgear housing is provided with a low-voltage circuit breaker opening and closing device as described in any one of claims 1-8. The low-voltage circuit breaker opening and closing device is fixedly installed on the mounting bracket. The opening and closing main body is electrically connected to the control circuit of the low-voltage switchgear.

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