Gas pressure relief and recovery device for gas-filled cabinets

Abstract

The application discloses a gas pressure relief and recovery device for an inflation cabinet, wherein a pressure relief cylinder is arranged in a flange plate, a sealing plate is arranged at the top of the pressure relief cylinder, a sealing plug is arranged at the bottom of the pressure relief cylinder, a plurality of stabilizing columns are arranged below the sealing plate, a plurality of stabilizing grooves are arranged in the sealing plug, a mounting sleeve is arranged in the sealing plug, a contact is arranged in the mounting sleeve, springs are arranged in the stabilizing columns and the stabilizing grooves, and a plurality of exhaust holes are arranged on the outer wall of the pressure relief cylinder. The sealing plate is displaced downward under the action of gas pressure, at which time the springs are compressed, and the sealing plate is automatically reset when the gas pressure is insufficient. The sealing plate continuously displaced downward is pressed on the contact, the contact slides in the mounting sleeve, springs arranged in the mounting sleeve are used for buffering the displacement of the contact, additional buffering is provided for the displacement of the sealing plate, damage caused by direct impact is avoided, and the service life of the pressure relief device is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of gas pressure relief technology for gas-filled cabinets, and specifically relates to a gas pressure relief and recovery device for gas-filled cabinets. Background Technology

[0002] Gas-insulated switchgear is a commonly used power distribution device in power grids. Existing gas-insulated switchgear all have a gas chamber filled with a pressurized insulating gas to ensure safe operation. Currently, many gas-insulated switchgear in power grids use SF6 gas, which has strong insulation and arc-extinguishing capabilities. When an arc fault occurs in the gas chamber of the switchgear, the gas pressure rises sharply. To reduce the pressure on the chamber and ensure the safety of operators, a pressure relief device is usually installed below the gas chamber to allow the gas to be quickly discharged.

[0003] Reference application number: 202311720136.5, a pressure relief device for a gas-insulated switchgear and its gas-insulated switchgear; it discloses a gas-insulated switchgear body and a pressure relief assembly, the pressure relief assembly including a pressure relief pipe, a guide pipe installed at the bottom of the pressure relief pipe, a threaded mounting seat threadedly installed at the end of the pressure relief pipe away from the gas-insulated switchgear body, a sliding rod installed on the threaded mounting seat, one end of the sliding rod extending into the interior of the pressure relief pipe, a sealing plate slidably installed inside the guide pipe, the sealing plate being fixed on the sliding rod, a connecting seat installed at the bottom of the guide pipe, the connecting seat having a guide cavity and an installation cavity respectively opened from top to bottom, the guide cavity and the installation cavity being connected through a guide hole. This pressure relief device for a gas-insulated switchgear and its gas-insulated switchgear can adjust the overall position of the sealing plate during operation by rotating and adjusting the connection distance between the threaded mounting seat and the guide pipe, thereby effectively adjusting the position of the sealing plate according to the different pressures within the overall insulating gas chamber.

[0004] In the above-mentioned scheme, the pressure relief process is achieved by a sealing plate, a sliding rod, and a return spring. However, relying solely on the return spring to displace the sealing plate can lead to impacts that reduce the lifespan of the pressure relief device. Furthermore, the sealing effect inside the gas cylinder is poor, easily causing gas leakage. Existing technologies also present cumbersome installation and disassembly processes for gas cylinders, requiring operators to adjust multiple fasteners. Additionally, when the gas pressure inside the filling cabinet drops or needs to be replenished, manual gas filling is required. Summary of the Invention

[0005] The purpose of this invention is to provide a gas depressurization and recovery device for a gas-filled cabinet to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A gas depressurization and recovery device for a gas-filled cabinet includes a gas box and a depressurization chamber. The gas box has a depressurization hole communicating with the depressurization chamber at its bottom. The bottom of the gas box has several connecting columns, and flanges are installed on the connecting columns.

[0008] A pressure relief cylinder is installed inside the flange. A sealing plate is located at the top inside the pressure relief cylinder, and a sealing plug is located at the bottom inside the pressure relief cylinder. Several stabilizing columns are distributed below the sealing plate. Several stabilizing grooves are opened inside the sealing plug. An installation sleeve is installed in the middle of the sealing plug. A contact is located inside the installation sleeve. Springs are installed inside the stabilizing columns and stabilizing grooves. Several vent holes are opened on the outer wall of the pressure relief cylinder.

[0009] An air storage cylinder is installed outside the pressure relief cylinder. The air storage cylinder includes a sealing chamber and an air inlet chamber. The sealing chamber is used to seal the inside of the air storage cylinder. The air inlet chamber is used to absorb the gas discharged from the exhaust port. A fitting ring is provided above the air inlet chamber. A base is installed below the air storage cylinder. An adjustment mechanism is installed at the bottom of the base. The adjustment mechanism is used to adjust the position of the air storage cylinder. An assist mechanism is provided inside the air box. The assist mechanism is used to push the sealing plate to move.

[0010] Furthermore, an air guide plate is provided between the sealing chamber and the air inlet chamber, wherein the surface of the air guide plate has several through holes. A rotary motor is installed below the sealing chamber, and the output end of the rotary motor is connected to a screw. A stabilizing plate is provided inside the sealing chamber, and the tail end of the stabilizing plate has a threaded hole that mates with the screw. A positioning shaft is inserted into the stabilizing plate, and a sealing disc is provided on one side of the stabilizing plate, which is located below the air guide plate.

[0011] Furthermore, the surface of the sealing disc is provided with a plurality of sealing heads, wherein the sealing heads cooperate with the through holes on the surface of the air guide plate. The sealing heads are made of rubber material.

[0012] Furthermore, one end of the base has a semi-circular arc structure, the lower outer wall of the gas storage cylinder has an outer ring, both ends of the base have sliding grooves, sliders are slidably mounted on the sliding grooves, and push plates are provided on the sliders. One side of the push plate has a semi-circular arc structure, and a slot is provided inside the push plate. One end of the push plate has a positioning post.

[0013] Furthermore, the adjustment mechanism includes a top plate and a movable plate. The top plate is installed below the base. A track is installed on the surface of the pressure relief chamber. The movable plate is slidably connected on the track. A lifting motor is installed on the surface of the movable plate. The output end of the lifting motor is supported below the top plate.

[0014] Furthermore, the bottom of the movable plate is symmetrically provided with perforated posts, and the two sides of the top plate are symmetrically provided with limiting posts that are concentrically matched with the perforated posts.

[0015] Furthermore, a shaft block is provided at the bottom center of the movable plate, and a long threaded rod is fitted on the shaft block. A displacement motor is installed inside the pressure relief chamber, wherein the output end of the displacement motor is connected to the long threaded rod.

[0016] Furthermore, a slide bar is installed on the air box, a support plate is fixed above the slide bar, an auxiliary motor is installed on the support plate, the output end of the auxiliary motor is connected to a threaded shaft, a long plate is installed on the threaded shaft, and a vertically downward push rod is provided on one side of the long plate.

[0017] The technical solution of this invention has the following beneficial effects:

[0018] 1. When the sealing plate is subjected to gas pressure, it will move downwards. At this time, the spring will be compressed. When the gas pressure is insufficient, the spring will release its stroke and automatically reset the sealing plate. The sealing plate, which continues to move downwards, will press against the contact. The contact slides inside the mounting sleeve. At the same time, a spring is also installed inside the mounting sleeve to buffer the displacement of the contact, providing additional buffer for the displacement of the sealing plate, avoiding damage caused by direct impact, and also extending the service life of the pressure relief device.

[0019] 2. When the gas cylinder is full or when it needs to be replaced: by starting the rotating motor, the screw engages with the threaded hole on the stabilizing plate, thereby moving the stabilizing plate upward. The sealing plate then comes into contact with the through hole on the surface of the gas guide plate, thus sealing the through hole and improving the sealing effect to prevent gas leakage.

[0020] 3. Pushing the push plate causes the slot to engage with the outer ring, thereby further improving the stability of the gas cylinder and preventing the gas cylinder from shaking or detaching from the base; the adjustment mechanism is used to adjust the position of the gas cylinder, while also improving the convenience of installation and disassembly.

[0021] 4. When the gas inside the gas cylinder is used as a backup gas source or a gas replenishment device, start the rotating motor. The vertically downward push rod will contact the surface of the sealing plate, pushing the sealing plate downward. The sealing plate will move to below the exhaust port, and the high-pressure gas inside the gas cylinder will enter the gas box through the exhaust port. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is an exploded view of the pressure relief chamber of the present invention.

[0025] Figure 3This is a cross-sectional view of the pressure relief chamber of the present invention.

[0026] Figure 4 This is an enlarged view of point A in the present invention.

[0027] Figure 5 This is a cross-sectional view of the internal structure of the pressure relief cylinder of the present invention.

[0028] Figure 6 This is an exploded view of the interior of the sealing chamber of the present invention.

[0029] Figure 7 This is a schematic diagram of the push plate installation according to the present invention.

[0030] Figure 8 This is a schematic diagram of the assist mechanism of the present invention.

[0031] Reference numerals: 11. Mechanism compartment; 12. Air chamber; 13. Cable compartment; 14. Pressure relief chamber; 15. Pressure relief hole; 16. Connecting column; 17. Flange;

[0032] 20. Pressure relief cylinder; 21. Sealing plate; 22. Sealing plug; 23. Stabilizing groove; 24. Stabilizing column; 25. Vent hole; 26. Spring; 27. Mounting sleeve; 28. Contact;

[0033] 30. Gas cylinder; 31. Sealing chamber; 32. Rotary motor; 33. Screw; 34. Stabilizing plate; 35. Positioning shaft; 36. Sealing disc; 37. Sealing head; 38. Air guide plate; 39. Threaded hole;

[0034] 40. Intake chamber; 41. Fitting ring; 42. Outer ring;

[0035] 50. Base; 51. Slide rail; 52. Push plate; 53. Slider; 54. Positioning post; 55. Slot;

[0036] 60. Track; 61. Moving plate; 62. Hole column; 63. Top plate; 64. Limiting column; 65. Lifting motor; 66. Shaft block; 67. Displacement motor; 68. Long threaded rod;

[0037] 70. Auxiliary motor; 71. Long plate; 72. Push rod; 73. Support plate; 74. Slide rod; 76. Threaded shaft; 80. Pressure gauge. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0039] Example 1:

[0040] refer to Figure 4 A gas depressurization and recovery device for a gas-filled cabinet includes a mechanism chamber 11, a gas box 12, a cable chamber 13, and a depressurization chamber 14. A depressurization hole 15 communicating with the depressurization chamber 14 is provided below the gas box 12. Several connecting columns 16 are provided at the bottom of the gas box 12, and flanges 17 are installed on the connecting columns 16.

[0041] In the above scheme, the connecting column 16 faces the pressure relief chamber 14, and the flange 17 has a countersunk hole. The countersunk hole is concentrically fitted onto the connecting column 16, and then installed in the countersunk hole by rotating the nut, thereby completing the connection of the flange 17.

[0042] refer to Figures 1-5 A pressure relief cylinder 20 is installed inside the flange 17. A sealing plate 21 is located at the top inside the pressure relief cylinder 20, and a sealing plug 22 is located at the bottom inside the pressure relief cylinder 20. Several stabilizing columns 24 are distributed below the sealing plate 21. Several stabilizing grooves 23 are opened inside the sealing plug 22. An installation sleeve 27 is installed in the middle of the sealing plug 22. A contact 28 is located inside the installation sleeve 27. Springs 26 are installed inside the stabilizing columns 24 and the stabilizing grooves 23. Several vent holes 25 are opened on the outer wall of the pressure relief cylinder 20.

[0043] In the above scheme, three stabilizing columns 24 are arranged in a ring. The stabilizing columns 24 and the stabilizing grooves 23 are concentric. A spring 26 is installed between the stabilizing columns 24 and the stabilizing grooves 23, which enhances the stability of the structure and ensures the smooth movement of the sealing plate 21 under pressure. This reduces malfunctions caused by vibration or instability and improves the reliability of the pressure relief device. When an arc fault occurs in the gas chamber of the gas holder, the gas pressure inside the gas chamber suddenly increases. The sealing plate 21 is subjected to the gas pressure and will move downward. At this time, the spring 26 is compressed. When the gas pressure inside the gas chamber is insufficient, the spring 26 will release its stroke, thereby automatically resetting the sealing plate 21. The continuously downward-moving sealing plate 21 will press on the contact 28, and the contact 28 will slide inside the mounting sleeve 27. At the same time, a spring is also installed inside the mounting sleeve 27 to buffer the displacement of the contact 28, providing additional buffer for the displacement of the sealing plate 21, avoiding damage caused by direct impact, and also extending the service life of the pressure relief device. When the sealing plate 21 is moved to below the exhaust port 25, the gas in the gas chamber 12 of the gas chamber will be discharged from the exhaust port 25.

[0044] refer to Figure 4 and Figure 6A gas storage cylinder 30 is installed outside the pressure relief cylinder 20. The gas storage cylinder 30 includes a sealing chamber 31 and an air inlet chamber 40. The sealing chamber 31 is used to seal the inside of the gas storage cylinder 30. A guide plate 38 is provided between the sealing chamber 31 and the air inlet chamber 40. The surface of the guide plate 38 has several through holes. A rotary motor 32 is installed below the sealing chamber 31. The output end of the rotary motor 32 is connected to a screw 33. A stabilizing plate 34 is provided inside the sealing chamber 31. The tail end of the stabilizing plate 34 has a threaded hole 39. The threaded hole 39 cooperates with the screw 33. A positioning shaft 35 is inserted into the stabilizing plate 34. A sealing disc 36 is provided on one side of the stabilizing plate 34. The sealing disc 36 is below the guide plate 38.

[0045] In the above scheme, several through holes are opened on the surface of the gas guide plate 38 for gas to enter the gas storage cylinder 30 through these through holes. When the gas storage cylinder 30 is full or when the gas storage cylinder needs to be replaced: by starting the rotary motor 32, the screw 33 engages with the threaded hole 39 on the stabilizing plate 34, thereby driving the stabilizing plate 34 to move upward. The sealing disc 36 comes into contact with the through holes on the surface of the gas guide plate 38, thereby sealing the through holes on the surface of the gas guide plate 38, which can improve the sealing effect and prevent gas leakage. The positioning shaft 35 is inserted into both sides of the stabilizing plate 34 to improve the smooth displacement of the stabilizing plate 34.

[0046] Further reference Figure 4 and Figure 6 The surface of the sealing disc 36 is provided with several sealing heads 37, wherein the sealing heads 37 cooperate with the through holes on the surface of the air guide plate 38.

[0047] In the above scheme, the sealing head 37 is made of rubber material. Rubber material has good elasticity and plasticity, and can produce slight deformation under pressure, thereby closely fitting the sealing surface and forming an effective seal. The upper rounded corner is set to improve the contact sealing effect. When the sealing disc 36 is close to the air guide plate 38, the sealing head 37 cooperates with the through hole to block the through hole.

[0048] refer to Figure 4 The intake chamber 40 is used to absorb the gas discharged from the exhaust port 25; a fitting ring 41 is provided above the intake chamber 40. The inner diameter of the fitting ring 41 matches the outer wall of the pressure relief cylinder 20. The gas storage cylinder 30 is installed by the fitting ring 41 wrapped around the outer wall of the pressure relief cylinder 20, thereby positioning the installation position of the gas storage cylinder 30. The gas inside the filling cabinet enters from the exhaust port 25 and is discharged into the intake chamber 40 from the exhaust port 25. The gas in the intake chamber 40 enters the gas storage cylinder 30 through the through holes on the surface of the air guide plate 38.

[0049] Example 2:

[0050] refer to Figure 2 and Figure 7A base 50 is installed below the gas cylinder 30; one end of the base 50 has a semi-circular arc structure, the lower outer wall of the gas cylinder 30 is provided with an outer ring 42, and both ends of the base 50 are provided with sliding grooves 51. A slider 53 is slidably installed on the sliding groove 51, and a push plate 52 is provided on the slider 53. One side of the push plate 52 has a semi-circular arc structure, and a slot 55 is provided inside the push plate 52.

[0051] In the above scheme, the base 50, which has a semi-circular arc structure at one end, places the gas cylinder 30 above the semi-circular arc to fit and stabilize the installation position of the gas cylinder 30. The semi-circular arc structure can closely fit the bottom contour of the gas cylinder 30, providing stable support and preventing the gas cylinder 30 from moving or tilting in the horizontal direction, ensuring its stability under various usage conditions; at the same time, it can quickly position the gas cylinder 30. The slide groove 51 and the slider 53 are T-shaped slide grooves. The slide groove 51 and the slider 53 cooperate together to push the push plate 52 so that the slot 55 is locked on the outer ring 42, thereby further improving the stability of the gas cylinder 30 and preventing the gas cylinder 30 from shaking or falling off the base 50. The push plate 52 has a semi-circular arc structure on one side, and the connecting end is a semi-circular arc structure base 50. The two semi-circular arc structures can be tightly and precisely connected, providing stable and uniform support for the gas cylinder 30 placed on the base 50, reducing the shaking or tilting of the object caused by unstable support, and further improving the stability of the overall structure and the ease of installation of the gas cylinder 30.

[0052] Further reference Figure 2 and Figure 7 One end of the push plate 52 is provided with a positioning post 54. A hole is opened on the surface of the base 50. When the push plate 52 is pushed to fit against the side of the gas cylinder 30, the positioning post 54 and the hole on the surface of the base 50 are concentric. A pin is connected between the two to restrict the position of the push plate 52, thereby stabilizing the installation of the gas cylinder 30.

[0053] Example 3:

[0054] refer to Figures 1-3 An adjustment mechanism is installed at the bottom of the base 50, which is used to adjust the position of the gas cylinder 30. The adjustment mechanism includes a top plate 63 and a movable plate 61. The top plate 63 is installed below the base 50. A rail 60 is installed on the surface of the pressure relief chamber 14. The movable plate 61 is slidably connected to the rail 60. A lifting motor 65 is installed on the surface of the movable plate 61. The output end of the lifting motor 65 is supported below the top plate 63.

[0055] In the above scheme, the height of the base 50, i.e. the installation height of the gas cylinder 30, is increased by controlling the start of the lifting motor 65; to remove the gas cylinder 30, the lifting motor 65 needs to be started to detach the fitting ring 41 from the pressure relief cylinder 20; to install the gas cylinder 30, the lifting motor 65 needs to be started to wrap the fitting ring 41 around the pressure relief cylinder 20, so that the exhaust port 25 enters the air intake chamber 40.

[0056] Further reference Figure 3 The bottom of the movable plate 61 is symmetrically provided with perforated posts 62, and the two sides of the top plate 63 are symmetrically provided with limiting posts 64 that are concentrically matched with the perforated posts 62. During the lifting and lowering process of the base 50 controlled by the lifting motor 65, the concentric matching of the perforated posts 62 and the limiting posts 64 can improve the moving stability of the base 50.

[0057] Further reference Figure 2 The bottom center of the movable plate 61 is provided with a shaft block 66, and a long threaded rod 68 is fitted on the shaft block 66. A displacement motor 67 is installed inside the pressure relief chamber 14, and the output end of the displacement motor 67 is connected to the long threaded rod 68.

[0058] In the above scheme, the gas cylinder 30 is further disassembled: the lifting motor 65 is started to disengage the fitting ring 41 from the pressure relief cylinder 20, and the displacement motor 67 is started. The long threaded rod 68 and the shaft block 66 mesh with each other, that is, the moving plate 61 moves outward, so that the gas cylinder 30 is disengaged from the pressure relief chamber 14, so that the staff can easily remove the gas cylinder 30; the push plate 52 is moved and removed, and the gas cylinder 30 is lifted upward, which facilitates the replacement of the gas cylinder 30 and improves the overall practicality of the device.

[0059] Example 4:

[0060] refer to Figure 8 The air box 12 is equipped with an assist mechanism, which is used to push the sealing plate 21 to move. The assist mechanism includes a support plate 73 and a slide rod 74. The slide rod 74 is installed on the air box 12, and the support plate 73 is fixed above the slide rod 74. An auxiliary motor 70 is installed on the support plate 73. The output end of the auxiliary motor 70 is connected to a threaded shaft 76. A long plate 71 is installed on the threaded shaft 76. A vertically downward push rod 72 is provided on one side of the long plate 71.

[0061] In the above scheme, the gas storage cylinder 30 stores gases such as nitrogen and sulfur hexafluoride. When the gas inside the gas storage cylinder 30 is needed as a backup gas source or gas replenishment device, the rotary motor 32 is started, the sealing plate 36 moves away from the gas guide plate 38, that is, the sealing head 37 disengages from the through hole. Then, by starting the auxiliary motor 70, the threaded shaft 76 engages with the long plate 71, and the long plate 71 moves downward. That is, the vertically downward push rod 72 contacts the surface of the sealing plate 21, pushing the sealing plate 21 downward. The sealing plate 21 moves to below the exhaust port 25, and the high-pressure gas inside the gas storage cylinder 30 enters the gas box 12 through the exhaust port 25. It is worth noting that the outer wall of the gas storage cylinder 30 has a pressure gauge 80, which is used to observe the gas volume inside the gas storage cylinder 30. The corresponding motor is started by the computer control system. The pressure gauge 80 is an electronically controlled pressure gauge, which is used to transmit electrical signals to the computer to make corresponding control commands.

[0062] Similarly, the gas storage cylinder 30 is used for gas depressurization and recovery: when the gas pressure in the gas tank of the filling cabinet suddenly increases, the excess gas enters the gas storage cylinder 30 for storage. When the gas pressure inside the filling cabinet decreases or gas needs to be replenished, the rotary motor 32 is started, the sealing plate 36 moves away from the gas guide plate 38, that is, the sealing head 37 disengages from the through hole. Then, by starting the auxiliary motor 70, the threaded shaft 76 engages with the long plate 71, and the long plate 71 will move downward. That is, the vertically downward push rod 72 will contact the surface of the sealing plate 21, pushing the sealing plate 21 downward. The sealing plate 21 moves to below the exhaust port 25, and the high-pressure gas inside the gas storage cylinder 30 enters the gas box 12 through the exhaust port 25.

[0063] The specific implementation process of the present invention is as follows (in conjunction with Embodiments 1 to 4):

[0064] Installation of gas cylinder 30: Start the displacement motor 67, the long threaded rod 68 and the shaft block 66 mesh with each other, that is, the moving plate 61 moves outward, placing the gas cylinder 30 on the base 50, the slide groove 51 and the slider 53 cooperate together, push the push plate 52 so that the slot 55 is locked on the outer ring 42; start the displacement motor 67 again so that the gas cylinder 30 is directly below the pressure relief cylinder 20; then control the lifting motor 65 to start, the position of the gas cylinder 30 rises, wrapping the fitting ring 41 around the pressure relief cylinder 20, so that the exhaust port 25 enters the air intake chamber 40;

[0065] Disassembly of gas cylinder 30: Start the rotary motor 32, the screw 33 engages with the threaded hole 39 on the stabilizing plate 34, thereby driving the stabilizing plate 34 to move upward. When the sealing plate 36 is close to the air guide plate 38, the sealing head 37 cooperates with the through hole to block the through hole. Control the lifting motor 65 to start, the position height of the gas cylinder 30 decreases. Start the displacement motor 67, the long threaded rod 68 engages with the shaft block 66, that is, the moving plate 61 moves outward. Remove the push plate 52, and lift the gas cylinder 30 upward to facilitate the replacement of the gas cylinder 30.

[0066] Decompression process: The gas pressure in the gas tank of the gas filling cabinet suddenly increases. The sealing plate 21 is subjected to the gas pressure and will move downward. At this time, the spring 26 is compressed and the sealing plate 21 moves to below the exhaust port 25. The gas in the gas tank 12 of the gas filling cabinet is discharged from the exhaust port 25 and enters the gas storage bottle 30.

[0067] When the gas inside the gas cylinder 30 is used as a backup gas source or a gas replenishment device, or for gas depressurization and recovery: the sealing plate 36 moves away from the gas guide plate 38, that is, the sealing head 37 disengages from the through hole. When the auxiliary motor 70 is started, the threaded shaft 76 engages with the long plate 71, and the long plate 71 moves downward. That is, the vertically downward push rod 72 contacts the surface of the sealing plate 21, pushing the sealing plate 21 downward. The sealing plate 21 moves to below the exhaust port 25, and the high-pressure gas inside the gas cylinder 30 enters the gas box 12 through the exhaust port 25.

[0068] The above embodiments are merely exemplary models of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Various modifications or equivalent substitutions can be made to the present invention within its spirit and scope of protection. Such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

[0069] In the description of this invention, it should be noted that the terms "inner," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the appended circle, or the orientation or positional relationship in which the product of this invention is conventionally placed during use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, these terms indicating orientation or positional relationships should not be construed as limitations on the invention.

[0070] In the description of this invention, it should be further noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, these terms can refer to a fixed connection, a detachable connection, or an integral connection between elements; they can also refer to a mechanical connection or an electrical connection; or they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

Claims

1. A gas depressurization and recovery device for a gas-filled cabinet, comprising a gas box (12) and a depressurization chamber (14), characterized in that: The gas box (12) is provided with a pressure relief hole (15) communicating with the pressure relief chamber (14) below. The bottom of the gas box (12) is provided with several connecting columns (16), and a flange (17) is installed on the connecting columns (16). A pressure relief cylinder (20) is installed inside the flange (17). A sealing plate (21) is located above the inside of the pressure relief cylinder (20). A sealing plug (22) is located below the inside of the pressure relief cylinder (20). Several stabilizing columns (24) are distributed below the sealing plate (21). Several stabilizing grooves (23) are opened inside the sealing plug (22). An installation sleeve (27) is installed in the middle of the sealing plug (22). A contact (28) is located inside the installation sleeve (27). Springs (26) are installed inside the stabilizing columns (24) and the stabilizing grooves (23). Several vent holes (25) are opened on the outer wall of the pressure relief cylinder (20). A gas storage cylinder (30) is installed outside the pressure relief cylinder (20). The gas storage cylinder (30) includes a sealing chamber (31) and an air inlet chamber (40). The sealing chamber (31) is used to seal the inside of the gas storage cylinder (30). The air inlet chamber (40) is used to absorb the gas discharged from the exhaust port (25). A fitting ring (41) is provided above the air inlet chamber (40). The inner diameter of the fitting ring (41) matches the outer wall of the pressure relief cylinder (20). The gas storage cylinder (30) is wrapped around the outer wall of the pressure relief cylinder (20) by the fitting ring (41). A base (50) is installed below the gas cylinder (30), and an adjustment mechanism is installed at the bottom of the base (50) for adjusting the position of the gas cylinder (30). The air box (12) is provided with an assist mechanism, which is used to push the sealing plate (21) to move below the exhaust port (25).

2. The gas depressurization and recovery device for a gas-filled cabinet according to claim 1, characterized in that: An air guide plate (38) is provided between the sealing chamber (31) and the air inlet chamber (40). The surface of the air guide plate (38) is provided with several through holes. A rotary motor (32) is installed below the sealing chamber (31). The output end of the rotary motor (32) is connected to a screw (33). A stabilizing plate (34) is provided inside the sealing chamber (31). A threaded hole (39) is provided at the tail end of the stabilizing plate (34). The threaded hole (39) cooperates with the screw (33). A positioning shaft (35) is inserted into the stabilizing plate (34). A sealing disc (36) is provided on one side of the stabilizing plate (34). The sealing disc (36) is below the air guide plate (38).

3. A gas depressurization and recovery device for a gas-filled cabinet according to claim 2, characterized in that: The sealing disc (36) has a plurality of sealing heads (37) distributed on its surface, wherein the sealing heads (37) cooperate with the through holes on the surface of the air guide plate (38).

4. A gas depressurization and recovery device for a gas-filled cabinet according to claim 3, characterized in that: The sealing head (37) is made of rubber material.

5. A gas depressurization and recovery device for a gas-filled cabinet according to claim 1, characterized in that: One end of the base (50) has a semi-circular arc structure. The outer wall of the gas storage bottle (30) is provided with an outer ring (42). The two ends of the base (50) are provided with sliding grooves (51). A slider (53) is slidably installed on the sliding groove (51). A push plate (52) is provided on the slider (53). One side of the push plate (52) has a semi-circular arc structure. A slot (55) is provided inside the push plate (52).

6. A gas depressurization and recovery device for a gas-insulated switchgear according to claim 5, characterized in that: One end of the push plate (52) is provided with a positioning post (54).

7. A gas depressurization and recovery device for a gas-insulated switchgear according to claim 1, characterized in that: The adjustment mechanism includes a top plate (63) and a movable plate (61). The top plate (63) is installed below the base (50). A track (60) is installed on the surface of the pressure relief chamber (14). The movable plate (61) is slidably connected on the track (60). A lifting motor (65) is installed on the surface of the movable plate (61). The output end of the lifting motor (65) is supported below the top plate (63).

8. A gas depressurization and recovery device for a gas-filled cabinet according to claim 7, characterized in that: The bottom of the movable plate (61) is symmetrically provided with perforated posts (62), and the two sides of the top plate (63) are symmetrically provided with limiting posts (64) that are concentrically matched with the perforated posts (62).

9. A gas depressurization and recovery device for a gas-filled cabinet according to claim 8, characterized in that: The bottom center of the movable plate (61) is provided with a shaft block (66), and a long threaded rod (68) is fitted on the shaft block (66). A displacement motor (67) is installed inside the pressure relief chamber (14), wherein the output end of the displacement motor (67) is connected to the long threaded rod (68).

10. A gas depressurization and recovery device for a gas-filled cabinet according to claim 1, characterized in that: The assist mechanism includes a support plate (73) and a slide rod (74). The slide rod (74) is installed on the air box (12). The support plate (73) is fixed above the slide rod (74). An auxiliary motor (70) is installed on the support plate (73). The output end of the auxiliary motor (70) is connected to a threaded shaft (76). A long plate (71) is installed on the threaded shaft (76). A vertically downward push rod (72) is provided on one side of the long plate (71).

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