A flexible solid insulation integrated device

Abstract

The application provides a kind of solid insulation integrated device of flexible connection, relating to solid insulation integrated device technical field, including solid insulation cabinet, the solid insulation cabinet is equipped with the shutter assembly that can open and close, the shutter assembly includes window frame, the inside of window frame is equipped with window leaf, the upper and lower ends of each window leaf are oppositely provided with clamping groove, the sealing rubber pad is equipped in the clamping groove of each window leaf, in the application, by extruding wedge-shaped extrusion plate in the process of sealing plate moving upwards, it is made to slide down along guide rod and compress reset spring, drive second rack to drive second gear to rotate, make heat dissipation fan adjust from initial vertical state to straight blow angle towards solid insulation block, at this time, heat dissipation fan blows air flow to the inside of solid insulation block through first pipe, cooperate with shutter to discharge, realize the targeted heat dissipation of conductive component, switch electrical element etc., avoid high temperature to cause insulation performance to drop.

Description

Technical Field

[0001] This invention belongs to the technical field of solid insulation integrated devices, and more specifically, relates to a flexible solid insulation integrated device. Background Technology

[0002] Solid-insulation integration is a technology that applies solid-insulation technology to electrical equipment to achieve integration, miniaturization, and high performance. In solid-insulation integration, flexible connections are flexible conductive connectors used to connect different electrical components, while solid-insulation ring main units (RMUs) are a specific type of solid-insulation integrated device. These RMUs use solid-insulation materials as the main insulation medium, integrating single or combined main conductive circuits such as vacuum interrupters, conductive connections, disconnect switches, grounding switches, main busbars, and branch busbars. The application of solid-insulation RMUs in smart grids reflects the intelligentization, integration, and reliability upgrades of power equipment. Through built-in intelligent sensors and digital communication modules, solid-insulation RMUs connect to the monitoring and management system of the smart grid, enabling real-time perception and remote control of equipment status. Their fully sealed, maintenance-free characteristics meet the operational requirements of smart grids for reduced manpower and high reliability.

[0003] 1. In high-temperature environments (such as long-term outdoor exposure), the epoxy resin material of current solid-insulated cabinets may soften locally due to insufficient thermal stability, leading to loosening of mechanical fixation of modules such as the arc-extinguishing chamber and affecting the accuracy of switch operation. In low-temperature environments (such as frigid regions), the toughness of the insulation material decreases, making it prone to cracking during mechanical operations (such as opening and closing). The sealing strip loses its elasticity after hardening, resulting in reduced cabinet sealing. In some desert areas, the temperature difference between day and night exceeds 40°C. Under such conditions, the epoxy resin inside the solid-insulated cabinet may encounter problems such as sealing failure and stress cracking of insulation components due to thermal expansion and contraction.

[0004] 2. In some areas with large temperature differences and high humidity, excessive humidity, if left untreated, can damage the epoxy resin inside the solid insulation cabinet, thereby reducing its insulation performance. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention provides a flexible connection solid insulation integrated device to solve the problems described above.

[0006] A flexible solid-insulation integrated device includes a solid-insulation cabinet. The cabinet has an openable and closable louver assembly. The louver assembly includes a window frame, with louvers inside the frame. Each louver has a snap-fit ​​groove at its upper and lower ends, and a sealing gasket is provided in each snap-fit ​​groove. The sealing gasket seals each louver when it is closed. A connecting shaft is fixedly installed through each louver, and a first gear is fixedly installed at both ends of each connecting shaft. A gear timing belt meshes between each of the first gears located at both ends of the connecting shaft. Inside the solid-insulation cabinet is a movable component for adjusting the louver assembly. Below the movable component is a fan assembly for turbulence control inside the solid-insulation cabinet. Two sets of linked adjustment mechanisms are provided between the fan assembly and the movable component.

[0007] Preferably, the solid insulation cabinet contains a solid insulation block, the upper end of the solid insulation block has a second through pipe, the lower end of the solid insulation block has a first through pipe, the second through pipe and the first through pipe communicate with the internal space of the solid insulation block, the moving component includes a sealing plate, two first racks are fixedly installed on the sealing plate, the two first racks are respectively meshed with the first gears at both ends of the window leaf, a moving rod is fixedly installed on the sealing plate, a threaded rod is installed inside the moving rod through the thread, the upper and lower ends of both sides of the sealing plate are provided with sliding grooves, and the inner walls of the solid insulation cabinet are provided with limiting strips on both sides.

[0008] Preferably, the sealing plate is slidably mounted on the limiting strip via an opening groove, and three connecting rods are fixedly mounted on the sealing plate. Each of the three connecting rods is fixedly mounted with a baffle. The adjusting mechanism includes a wedge-shaped extrusion plate, and a guide rod is fixedly mounted on the wedge-shaped extrusion plate. The guide rod is slidably mounted on the solid insulating block, and a return spring is sleeved on the circumferential surface of the guide rod.

[0009] Preferably, the reset spring is fixedly installed between the solid insulating block and the wedge-shaped extrusion plate, a second rack is fixedly installed at the lower end of the wedge-shaped extrusion plate, a second gear meshes on the second rack, the fan assembly includes a fixed rod, a fan shaft is rotatably installed inside the fixed rod, the fan shaft is fixedly installed on the second gear, a cooling fan is fixedly installed on the fan shaft, and two air guide plates are fixedly installed at the lower end of the solid insulating cabinet, the opposing surfaces of the two air guide plates are both arc-shaped.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] In this invention, a complete temperature adaptive regulation system is formed by installing an openable and closable louver assembly on a solid insulating cabinet and integrating a moving assembly and a fan assembly inside the cabinet. When the device is in a high-temperature environment, the threaded rod in the moving assembly rotates under the drive of the motor, causing the sealing plate to slide upward along the limiting strip. At this time, the first rack fixed to the sealing plate moves synchronously, and through the meshing first gear and gear synchronous belt, all the louvers rotate around the connecting shaft, so that the louver assembly is in the open state, and the hot air inside can be discharged through the gap between the louvers. At the same time, during the upward movement of the sealing plate, the wedge-shaped extrusion plate is squeezed, causing it to slide downward along the guide rod and compress the return spring, which drives the second rack to drive the second gear to rotate, so that the cooling fan is adjusted from the initial vertical state to a direct blowing angle towards the solid insulating block. At this time, the cooling fan blows air into the solid insulating block through the first pipe, which, together with the louvers, discharges the air, achieving targeted heat dissipation for conductive parts, switching electrical components, etc., and avoiding the degradation of insulation performance due to high temperature.

[0012] In this invention, a multi-functional airflow control mechanism is constructed by installing two sets of cooling fans inside the cabinet. When the internal temperature of the cabinet is normal but there is a risk of moisture condensation, the moving component can control the louvers to remain closed. At this time, the cooling fan is adjusted to maintain a vertically downward rotation angle through the adjustment mechanism. The airflow generated by the fan rotation is guided by the arc surface of the air guide plate and forms a circulating turbulence inside the cabinet. This turbulence can disperse the accumulated moisture and prevent moisture from condensing on the surface of the solid insulation block, thus affecting the insulation performance. When the cabinet temperature rises and heat dissipation is required, the fan can be adjusted to blow directly onto the solid insulation block under the action of the linkage component. Through the airflow channel formed by the first and second pipes, forced air cooling is performed on the internal components, realizing the dual function switching of "direct heat dissipation" and "turbulence dehumidification", which significantly improves the operational reliability of the device in different environments.

[0013] In this invention, by implementing a multi-layer sealing design on the cabinet in low-temperature environments, the solid insulating block maintains a suitable operating temperature. When the ambient temperature drops, the moving component drives the sealing plate downwards, causing the first rack to reverse and rotate the window leaf to a closed state. At this time, the sealing gaskets in the upper and lower end locking grooves of the window leaf press against each other, forming the first sealing barrier. Simultaneously, the sealing plate, through the cooperation of the sliding groove and the limiting strip, tightly adheres to the inner wall of the cabinet, forming the second sealing structure, effectively preventing the intrusion of cold air from the outside. In this state, the heat generated by the operation of the conductive components inside the solid insulating block is sealed inside the cabinet and circulates inside the insulating block through the first and second pipes, allowing the temperature to gradually rise to the suitable operating range of the epoxy resin and other insulating materials. This avoids the hardening and cracking of the insulating material due to low temperatures, thereby ensuring the stable operation of the device in cold environments and expanding the applicable temperature range of the equipment.

[0014] In this invention, a mechanical linkage structure is used to achieve synchronous control of the opening and closing of the louvers and the adjustment of the fan angle, which greatly improves the automation capability of the device. Specifically, when the sealing plate in the moving component moves up and down under the drive of the threaded rod, the wedge-shaped structure on its side will simultaneously squeeze or release the wedge-shaped squeezing plate. Through the cooperation of the guide rod and the return spring, the linear motion of the sealing plate is converted into the vertical movement of the second rack, which in turn drives the fan shaft to rotate through the second gear, thereby realizing the angle adjustment of the cooling fan. This linkage mechanism allows the cooling fan to automatically switch to the direct blowing mode of the insulating block when the louvers are open; when the louvers are closed, the cooling fan returns to the turbulent dehumidification or stop state. No additional control system or sensor is required; adaptive adjustment can be completed solely through the mechanical structure. This not only reduces the complexity and cost of the device but also improves the reliability of the system and avoids the problem of heat dissipation failure caused by electrical control faults.

[0015] In this invention, the integrated design of the louver assembly and the sealing plate achieves a dual optimization of sealing performance and ease of operation. When the louver slats are closed, they form a tight fit through the sealing gasket in the snap-fit ​​groove. Combined with the secondary sealing of the sealing plate, this effectively isolates dust, moisture, and external pollutants, meeting the requirements for high protection levels. When heat dissipation is needed, the operator only needs to start the motor of the moving component and the threaded rod to simultaneously drive the sealing plate to move upward. During this process, the first rack drives the louver slats to rotate and open, while the connecting rod and baffle on the sealing plate release the obstruction of the ventilation path, forming a continuous airflow channel. This "one-button" operation eliminates the need to control the louver and sealing plate separately, simplifying the operation process. The compact structural design and smooth linkage of all components ensure both the insulation reliability in the sealed state and rapid ventilation during heat dissipation, fully demonstrating the advantages of the device in practicality and engineering applications. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the solid insulating cabinet of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the solid insulating block of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the fixing rod of the present invention;

[0020] Figure 5 This is a schematic diagram of the sealing plate of the present invention;

[0021] Figure 6 This is a schematic diagram of the structure of the wedge-shaped extrusion plate of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure of the first rack of the present invention;

[0023] Figure 8 This is the present invention. Figure 4 Enlarged schematic diagram of the structure at point B;

[0024] Figure 9 This is the present invention. Figure 7 An enlarged schematic diagram of the structure at point A.

[0025] In the diagram, the correspondence between the component names and the attached drawing numbers is as follows: 11. Gear synchronous belt; 12. First gear; 13. Connecting shaft; 14. Sealing gasket; 15. First rack; 16. Snap-fit ​​groove; 17. Window leaf; 18. Window frame; 21. Sealing plate; 22. Moving rod; 23. Baffle; 24. Connecting rod; 25. Slide groove; 31. Solid insulating block; 32. First through pipe; 33. Second through pipe; 34. Guide rod; 35. Return spring; 36. Wedge-shaped extrusion plate; 41. Fixing rod; 42. Cooling fan; 43. Fan shaft; 44. Second gear; 45. Second rack; 51. Solid insulating cabinet; 52. Air guide plate; 53. Threaded rod; 54. Limiting strip. Detailed Implementation

[0026] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0027] Please see Figures 1-9 This invention provides a flexible connection solid insulation integrated device, including a solid insulation cabinet 51. The solid insulation cabinet 51 is provided with an openable and closable louver assembly. The louver assembly includes a window frame 18, and the window frame 18 has multiple sets of window slats 17 inside. Except for the top and bottom window slats 17, each of the other window slats 17 has a snap-fit ​​groove 16 at its upper and lower ends. Each snap-fit ​​groove 16 of each window slat 17 is provided with a sealing gasket 14. The sealing gasket 14 is used to seal each window slat 17 when it is closed. The snap-fit ​​grooves 16 are located on the opposite sides of the top and bottom window slats 17. Corresponding to the middle window leaf 17, a connecting shaft 13 is fixedly installed through each window leaf 17. A first gear 12 is fixedly installed on both sides of each connecting shaft 13. A gear timing belt 11 meshes between each first gear 12 on both sides. A solid insulating block 31 is provided inside the solid insulating cabinet 51. A second through pipe 33 is provided at the upper end of the solid insulating block 31. A first through pipe 32 is provided at the lower end of the solid insulating block 31. Conductive components, switching electrical components, and current transformers are provided inside the solid insulating block 31. The second through pipe 33 and the first through pipe 32 communicate with the internal space of the solid insulating block 31.

[0028] The solid insulation cabinet 51 is equipped with a movable component for adjusting the louver assembly. The movable component can also be used to seal the position of the louver. Below the movable component is a fan assembly for turbulence inside the solid insulation cabinet 51. There are two sets of linked adjustment mechanisms between the fan assembly and the movable component.

[0029] In this embodiment, as Figure 3 , Figure 5 , Figure 7 , Figure 8 As shown, the movable component includes a sealing plate 21, on which two first racks 15 are fixedly mounted. The two first racks 15 are respectively meshed with first gears 12 at both ends of the window leaf 17. When the first racks 15 move back and forth, they can drive the first gears 12 to rotate. When the first gears 12 rotate, they can drive the window leaf 17 to rotate, thereby achieving the effect of adjusting multiple window leaves 17. A movable rod 22 is fixedly mounted on the sealing plate 21. A threaded rod 53 is threaded through the movable rod 22. A motor is mounted on the threaded rod 53 and installed inside the solid insulating cabinet 51 via a bracket. When the motor drives the threaded rod 53 to rotate, the rotation is achieved through the thread between the threaded rod 53 and the movable rod 22. The connection drives the sealing plate 21 to move within the solid insulation cabinet 51. The sealing plate 21 has sliding grooves 25 at both its upper and lower ends. Limiting strips 54 are provided on both sides of the inner wall of the solid insulation cabinet 51. The sealing plate 21 is slidably mounted on the limiting strips 54 via the sliding grooves 25. Three connecting rods 24 are fixedly installed on the sealing plate 21, and baffles 23 are fixedly installed on each of the three connecting rods 24. When the equipment is in a high-temperature environment, the louver assembly can be opened by controlling the movement component to dissipate heat inside. In a low-temperature environment, to avoid damage to the epoxy resin, the movement component can be reversed to close the louver assembly, allowing heat to remain inside the solid insulation cabinet 51 and heat the solid insulation block 31.

[0030] In this embodiment, as Figure 1 , Figure 4 , Figure 6 , Figure 9As shown, the adjusting mechanism includes a wedge-shaped extrusion plate 36, on which a guide rod 34 is fixedly mounted. The guide rod 34 is slidably mounted on the solid insulating block 31. A return spring 35 is sleeved on the circumferential surface of the guide rod 34. The return spring 35 is fixedly mounted between the solid insulating block 31 and the wedge-shaped extrusion plate 36. A second rack 45 is fixedly mounted on the lower end of the wedge-shaped extrusion plate 36. A second gear 44 meshes with the second rack 45. Since the sealing plate 21 is on the side of the wedge-shaped extrusion plate 36, when the sealing plate 21... During movement, the wedge-shaped pressing plate 36 is compressed. Since the wedge-shaped pressing plate 36 is a wedge-shaped block, it can move downward under the compression of the sealing plate 21, thereby driving the second rack 45 to move. Then, through the meshing between the second rack 45 and the second gear 44, the second gear 44 is rotated, which in turn drives the fan assembly to move. Through the adjustment mechanism, the opening and closing of the louver assembly can be connected with the fan assembly inside, so that the fan assembly can perform different functions at different angles.

[0031] In this embodiment, as Figure 2 , Figure 3 , Figure 4 , Figure 9 As shown, the fan assembly includes a fixed rod 41, a fan shaft 43 is rotatably mounted inside the fixed rod 41, the fan shaft 43 is fixedly mounted on the second gear 44, and a cooling fan 42 is fixedly mounted on the fan shaft 43. Two air guide plates 52 are fixedly mounted at the lower end of the solid insulation cabinet 51. The opposing surfaces of the two air guide plates 52 are arc-shaped. When the two cooling fans 42 are vertically downward, the air they blow out can circulate inside the solid insulation cabinet 51 through the air guide plates 52. When the two cooling fans 42 are spread out, they are below the two first through pipes 32. At this time, the two cooling fans 42 blow air into the solid insulation block 31 through the two first through pipes 32, thereby dissipating heat from the solid insulation cabinet 51.

[0032] The solid insulation cabinet inside the device connects to the monitoring and management system of the smart grid through built-in intelligent sensors and digital communication modules, enabling real-time perception and remote control of the equipment status. Its fully sealed and maintenance-free characteristics meet the requirements of the smart grid for less manpower and high reliability.

[0033] Working principle:

[0034] In the first step, under low-temperature conditions (such as in frigid regions where the toughness of the insulation material decreases and cracks are easily generated during mechanical operations (such as switching on and off), and the sealing strip loses its elasticity after hardening, resulting in reduced cabinet sealing), the louver assembly is in a closed state. The sealing gasket 14 seals the gaps between the louvers 17 to prevent dust, moisture, etc. from entering the solid insulation cabinet 51. At the same time, the sealing plate 21 in the moving assembly also provides a secondary seal for the louver assembly to ensure a stable insulation environment inside the cabinet. When the internal temperature of the solid insulation cabinet 51 decreases and insulation is required to avoid damage to the epoxy resin, the motor drives the threaded rod 53 to rotate in the opposite direction, and the sealing plate 21 moves downward. When the sealing plate 21 moves downward, the first rack 15 drives the first gear 12 to rotate in the opposite direction, causing the louvers 17 to close and the louver assembly to close, reducing heat loss. At this time, the heat inside the solid insulation cabinet 51 is retained, heating the solid insulation block 31 to ensure its normal operating temperature.

[0035] In the second step, the sealing plate 21 stops pressing the wedge-shaped pressing plate 36, the return spring 35 returns to its original state, and pushes the wedge-shaped pressing plate 36 to move upward. The second rack 45 drives the second gear 44 to rotate in the opposite direction, and the cooling fan 42 stops rotating or returns to its initial position. The arc design of the air guide plate 52 helps to guide the airflow. When the cooling fan 42 is working, the air can flow more effectively inside the cabinet, improving the heat dissipation efficiency. At this time, the cooling fan 42 pushes the air to circulate inside the cabinet, avoiding local low temperature / high temperature areas caused by day and night temperature differences or uneven heating of components. It can also prevent local condensation at low temperatures. When the day and night temperature difference is large, water vapor is prone to condensation in the low temperature area inside the cabinet (such as condensation on the surface of epoxy resin). The circulating air can blow away the water vapor and reduce humidity.

[0036] The second step involves the following steps: When exposed to high temperatures, such as prolonged exposure to sunlight outdoors, the epoxy resin material's thermal stability is insufficient, causing the internal temperature of the solid insulation cabinet 51 to rise and requiring heat dissipation. The motor drives the threaded rod 53 to rotate. Since there is a threaded connection between the threaded rod 53 and the moving rod 22, the sealing plate 21 will move upward along the limiting strip 54 inside the solid insulation cabinet 51. When the sealing plate 21 moves upward, the two first racks 15 fixed on it also move upward. The first racks 15 mesh with the first gears 12 on both sides of the window leaf 17, thereby driving the first gears 12 to rotate. The first gears 12 drive the window leaf 17 to rotate through the connecting shaft 13, causing the louver assembly to open, and the heat inside the solid insulation cabinet 51 can be dissipated to the outside.

[0037] Thirdly, as the sealing plate 21 moves upward, its side will squeeze the wedge-shaped extrusion plate 36. Since the wedge-shaped extrusion plate 36 is a wedge-shaped block, it will move downward under the extrusion action. The guide rod 34 slides on the solid insulating block 31, and the return spring 35 is compressed. When the wedge-shaped extrusion plate 36 moves downward, it drives the second rack 45 fixed at its lower end to move downward. The second rack 45 meshes with the second gear 44, causing the second gear 44 to rotate. The second gear 44 drives the cooling fan 42 to rotate through the fan shaft 43. When the cooling fan 42 rotates to the downward vertical position, the blown air passes through the air guide plate 52 and circulates inside the solid insulating cabinet 51 to dissipate heat inside the cabinet. When the cooling fan 42 continues to rotate to the mutually spread position, it is below the two first through pipes 32. At this time, the cooling fan 42 blows air into the solid insulating block 31 through the first through pipes 32 to further enhance the heat dissipation effect on the solid insulating block 31.

[0038] The fourth step involves the linkage of the moving components and the adjustment mechanism to achieve automatic adjustment of the opening and closing of the louver assembly and the operating status of the fan assembly. Based on the changes in the internal temperature of the cabinet, the heat dissipation or heat preservation mode is automatically adjusted to ensure that the solid insulation integrated device can work stably in different temperature environments.

[0039] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A flexible connection solid insulation integrated device, comprising a solid insulation cabinet (51), characterized in that: The solid insulation cabinet (51) is provided with a louver assembly that can be opened and closed. The louver assembly includes a window frame (18), and the window frame (18) is provided with window leaf (17). Each window leaf (17) has a snap-fit ​​groove (16) at its upper and lower ends. Each window leaf (17) has a sealing gasket (14) in the snap-fit ​​groove (16). The sealing gasket (14) is used to seal each window leaf (17) when it is closed. Each window leaf (17) is fixedly installed with a connecting shaft (13). Each connecting shaft (13) is fixedly installed with a first gear (12) at both ends. A gear timing belt (11) meshes between each first gear (12) at both ends of the connecting shaft (13). Inside the solid insulation cabinet (51), there is a movable component for adjusting the louver assembly. Below the movable component, there is a fan assembly for turbulence inside the solid insulation cabinet (51). There are two sets of linkage adjustment mechanisms between the fan assembly and the movable component. The solid insulation cabinet (51) is provided with a solid insulation block (31). The upper end of the solid insulation block (31) is provided with a second through pipe (33), and the lower end of the solid insulation block (31) is provided with a first through pipe (32). The second through pipe (33) and the first through pipe (32) communicate with the internal space of the solid insulation block (31). The moving component includes a sealing plate (21). Two first racks (15) are fixedly installed on the sealing plate (21). The two first racks (15) are respectively meshed with the first gears (12) at both ends of the window leaf (17). The adjustment mechanism includes a wedge-shaped extrusion plate (36), on which a guide rod (34) is fixedly installed. The guide rod (34) is slidably installed on the solid insulating block (31). A reset spring (35) is sleeved on the circumferential surface of the guide rod (34). The reset spring (35) is fixedly installed between the solid insulating block (31) and the wedge-shaped extrusion plate (36). A second rack (45) is fixedly installed at the lower end of the wedge-shaped extrusion plate (36). A second gear (44) meshes on the second rack (45). The fan assembly includes a fixed rod (41), a fan shaft (43) is rotatably installed inside the fixed rod (41), the fan shaft (43) is fixedly installed on the second gear (44), a cooling fan (42) is fixedly installed on the fan shaft (43), and two air guide plates (52) are fixedly installed at the lower end of the solid insulation cabinet (51), the opposite surfaces of the two air guide plates (52) are both arc-shaped.

2. The solid-insulation integrated device for flexible connection as described in claim 1, characterized in that, A movable rod (22) is fixedly installed on the sealing plate (21). A threaded rod (53) is installed inside the movable rod (22) through a thread. Slide grooves (25) are provided at both the upper and lower ends of both sides of the sealing plate (21). Limiting strips (54) are provided on both sides of the inner wall of the solid insulation cabinet (51).

3. The solid-insulation integrated device for flexible connection as described in claim 2, characterized in that, The sealing plate (21) is slidably mounted on the limiting strip (54) through the opening of the sliding groove (25). Three connecting rods (24) are fixedly installed on the sealing plate (21), and baffles (23) are fixedly installed on each of the three connecting rods (24).

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