Environment-friendly gas insulated switchgear for power distribution network and working method thereof

Abstract

This invention relates to, but is not limited to, the technical field of switchgear, and discloses an environmentally friendly gas-insulated switchgear for power distribution networks and its operating method. The environmentally friendly gas-insulated switchgear for power distribution networks includes a switchgear body and a pressure relief unit. The pressure relief unit includes a pressure relief component disposed on the top of the switchgear body. The pressure relief component includes a fixed cylinder disposed on the top of the switchgear body, with its top and bottom open; a pressure relief hole disposed on the outer end of the fixed cylinder; a piston disc disposed on the inner wall of the fixed cylinder; and a guide hole disposed at the bottom of the piston disc. This environmentally friendly gas-insulated switchgear for power distribution networks, by using a piston disc, can reduce the pressure inside the switchgear body when the internal gas pressure rises. The slow movement of the piston disc balances the internal gas pressure. When the gas pressure rises to a certain level, some gas can be released through the guide hole and the pressure relief hole, ultimately achieving the purpose of gradual pressure relief.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the technical field of switchgear, and particularly to an environmentally friendly gas-insulated switchgear for power distribution networks. Background Technology

[0002] A switchgear is an electrical device. External power lines first enter the main control switch inside the cabinet, then the branch control switches. Each branch circuit is configured according to its needs. Its main function is to perform opening, closing, control, and protection during power generation, transmission, distribution, and energy conversion in the power system. When the internal voltage of the switchgear is too high, insulation is required to prevent safety accidents. Existing methods include using insulating protective sleeves or filling with insulating gas.

[0003] Patent publication number CN110165584B discloses a pressure relief explosion-proof switch cabinet, which includes a cabinet body, a connecting plate, and a cover plate. The top of the cabinet body is provided with a top plate, and the top plate has an installation port that connects to the interior of the cabinet body. The connecting plate is located at the installation port and is detachably connected to the edge of the installation port. The connecting plate is provided with a vent hole. The cover plate is located on the upper part of the connecting plate and covers the vent hole. The edge of the cover plate is connected to the connecting plate by an elastic element.

[0004] The aforementioned patent has the following defects:

[0005] 1. For switchgear filled with insulating gas, the working environment temperature will rise with the ambient temperature, and the internal gas pressure will gradually increase. Under normal circumstances, a slight increase in gas pressure is normal. If the gas is released and depressurized under this situation, the internal gas pressure will decrease again when the temperature drops. At this time, gas needs to be replenished. This process is repeated, which increases the workload of the staff.

[0006] 2. Traditional pressure relief methods do not pay attention to staged pressure relief, resulting in a pressure relief process that is too rapid. This causes the pressure relief mechanism to be unable to cope with the surge in air pressure and become damaged. This not only requires subsequent maintenance, but may even cause the pressure relief mechanism to break into pieces and fly away, causing damage to surrounding equipment or personnel. Summary of the Invention

[0007] In view of the problems of internal gas loss due to pressure relief in existing switchgear and the lack of a graded pressure relief mechanism, this invention proposes an environmentally friendly gas-insulated switchgear for power distribution networks and its working method.

[0008] One aspect of this application provides an environmentally friendly gas-insulated switchgear for power distribution networks, the purpose of which is to solve the problem that current switchgear cannot perform graded pressure relief.

[0009] The technical solution of the present invention is as follows: an environmentally friendly gas-insulated switchgear for power distribution networks, comprising a switchgear body and a pressure relief unit; the pressure relief unit is disposed on the top of the switchgear body and is used to release the gas inside the switchgear body; the pressure relief unit includes: a pressure relief component disposed on the top of the switchgear body for relieving pressure on the high-voltage switchgear body; the pressure relief component includes: a fixed cylinder disposed on the top of the switchgear body, with the top and bottom being open; a pressure relief hole disposed on the fixed cylinder; a piston disc disposed on the inner wall of the fixed cylinder that can be raised and lowered; and a guide hole disposed at the bottom of the piston disc;

[0010] The limiting component, located inside the fixed cylinder, is used to limit the moving area of ​​the piston disc.

[0011] Using the above technical solution, when the internal air pressure of the switchgear body rises, the pressure inside the switchgear body can be reduced by pushing the piston disc. The slow movement of the piston disc balances the air pressure inside the switchgear body. When the air pressure rises to a certain level, the gas inside the switchgear body will be released to the outside through the guide hole and the pressure relief hole, achieving the purpose of rapid pressure relief.

[0012] Furthermore, it also includes explosion-proof units;

[0013] The explosion-proof unit is located inside the pressure relief unit and is used to release pressure in a timely manner when the gas pressure surges.

[0014] The explosion-proof unit includes: a pin component disposed on the top of the piston disc, which can push the limit plate to move when the speed is too high;

[0015] The pin component includes: a fixing rod disposed on the top of the piston disc; a guide groove disposed on the outside of the fixing rod; and a protective sleeve disposed on the outside of the fixing rod.

[0016] The cover opening component is located on the outside of the fixed cylinder and is used for large-area pressure relief to prevent the switch cabinet body from exploding.

[0017] Using the above technical solution, when the piston disc is subjected to a huge impact force, the piston disc will move rapidly. Under the action of inertia, the protective sleeve moves in the guide groove, so that the internal fixing rod can be exposed.

[0018] Furthermore, the fixing rod includes a pointed part disposed inside the protective sleeve, a curved part disposed at the bottom end of the pointed part, a friction part disposed inside the guide groove, and a vertical part disposed at the bottom end of the curved part.

[0019] By adopting the above technical solution, the fixing rod is divided into three parts. In the initial structure or slow piston disc phase, the protective sleeve can stay at the tip, while when the piston disc moves quickly, the protective sleeve moves to the curved part, thereby exposing the tip.

[0020] Furthermore, the limiting component includes: a sliding plate disposed on the inner wall of the fixed cylinder; a first magnet disposed on one side of the sliding plate; a limiting plate disposed on the inner wall of the fixed cylinder; a second magnet disposed on the outer end of the limiting plate and interacting with the first magnet; a movable hole disposed on the limiting plate; and a locking assembly disposed on the movable hole.

[0021] By using the above technical solution, the limiting plate can be temporarily fixed by setting the first magnet and the second magnet. When the impact force on the skateboard is too large, the attraction between the first magnet and the second magnet can be broken, and the skateboard can start to move.

[0022] Furthermore, the locking assembly includes: a rotating plate disposed inside the movable hole; an elastic element disposed on one side of the rotating plate; a ramp plate disposed on one side of the elastic element; and a locking block disposed on one side of the ramp plate, wherein the locking block is adapted to the guide groove.

[0023] Using the above technical solution, when the ramp plate is touched, the inside of the movable hole can pass through. However, when the locking block is moved, the rotating plate cannot move. If the thrust is increased further, the sliding plate can only be moved upward.

[0024] Furthermore, the cover opening assembly includes: a lifting member disposed on the top of the slide plate; a locking pin disposed at the lower end of the lifting member; a vent hole disposed on the fixed cylinder; an arc-shaped cover plate covering the vent hole; and an insertion hole disposed on the top of the arc-shaped cover plate, wherein the locking pin is inserted into the insertion hole.

[0025] Using the above technical solution, when the slide plate moves upward, the lifting plate moves the locking pin upward, causing the pin to disengage from the insertion hole. After the arc-shaped cover plate loses the restraint of the pin, it begins to flip under the action of gravity, ultimately achieving the effect of exposing the vent hole.

[0026] Furthermore, it also includes a fire extinguishing unit; used to extinguish flames inside the switchgear body;

[0027] The fire extinguishing unit includes a powder spraying component located below the piston disc for spraying fire extinguishing dust;

[0028] The powder spraying component includes: a powder storage box located at the top of the switch cabinet body; a heat insulation bag located inside the powder storage box; fire extinguishing powder located inside the heat insulation bag; a puncture plate located at the bottom of the powder storage box, with an adhesive layer between the puncture plate and the powder storage box; and a trigger element located at one end at the bottom of the piston plate.

[0029] A stirring component, located outside the breach plate, is used to stir the extinguishing powder.

[0030] Using the above technical solution, in the initial situation, the trigger is always in a relaxed state when the piston plate moves up and down. When the piston plate moves quickly and pushes the slide plate, it will pull the breach plate away from the powder storage box, causing the extinguishing powder inside to fall and extinguish the flame.

[0031] Furthermore, the stirring component includes: a rotating shaft disposed on one side of the rupture plate; a spring coil disposed outside the rotating shaft; a winding roller disposed outside the rotating shaft, with the other end of the trigger member wound around the outside of the winding roller; a spline groove disposed on the top of the rotating shaft; and a stirring plate disposed at the outer end of the rotating shaft.

[0032] By adopting the above technical solution, when the piston plate moves up and down repeatedly, it will pull the rotating shaft to rotate, causing the stirring plate to rotate frequently and stir the extinguishing powder, effectively preventing it from clumping and reducing its extinguishing function.

[0033] Furthermore, a working method for an environmentally friendly gas-insulated switchgear for power distribution networks is provided, including the following steps: the internal air pressure of the switchgear body rises, pushing the piston disc to move slowly, thereby balancing the air pressure inside the switchgear body.

[0034] As the internal air pressure of the switchgear continues to rise, the piston disc continues to move upward.

[0035] When the piston disc moves to the position of the limit component, the piston disc approaches the pressure relief hole. At this time, the gas inside the switch cabinet body can be released to the outside through the guide hole and the pressure relief hole, which achieves the purpose of secondary pressure relief.

[0036] By adopting the above technical solution, when the internal air pressure of the switchgear body rises, the pressure inside the switchgear body can be reduced by pushing the piston disc. The slow movement of the piston disc balances the internal air pressure of the switchgear body. When the air pressure rises to a certain level, some gas can be released through the guide hole and pressure relief hole, ultimately achieving the purpose of step-by-step pressure relief.

[0037] Furthermore, the internal air pressure of the switch cabinet gradually increases, and the gas pressure will push the piston disc to move. When the piston disc rises slowly and at a constant speed, the protective sleeve stays at the tip under the action of the friction part, and the protective sleeve rises with the fixing rod.

[0038] As the locking component approaches, the protective sleeve will push the ramp plate and the rotating plate to move relative to each other. At this time, the fixed rod can pass through the movable hole until the piston plate approaches the limit plate, and the internal gas guide hole and pressure relief hole are released to the outside.

[0039] When the piston disc is subjected to a huge impact, it will move upward rapidly. Under the action of inertia, the protective sleeve begins to slide outside the guide groove, exposing the tip.

[0040] When the tip approaches the ramp plate, the ramp plate is pushed to extend and retract the elastic element. Finally, the locking block slides smoothly into the guide groove. The fixing rod will move the locking plate upward in parallel, breaking through the attraction between the first magnet and the second magnet 225. The limiting plate will move upward.

[0041] The limiting plate forces the lifting component to move upward along with the locking pin, causing the pin to disengage from the insertion hole. After the arc-shaped cover loses the limiting position of the pin, it begins to flip under the action of gravity, exposing the vent hole, thus allowing for large-area venting and explosion prevention.

[0042] When the piston plate moves up and down repeatedly due to the influence of air pressure, it will pull the rotating shaft to rotate through the rope roller, thereby causing the stirring plate to rotate frequently and stirring the extinguishing powder.

[0043] When the piston plate is subjected to a huge impact force, it not only deviates from the limit plate, but the huge pulling force will also cause the rupture plate to detach from the powder storage box, and the heat insulation bag will also be torn, ultimately causing the extinguishing powder to fall and extinguish the fire inside the powder storage box.

[0044] By adopting the above technical solution, and by setting up a protective sleeve and friction part, on the one hand, the protective sleeve can be kept at the tip when the piston plate rises slowly, so that the protective sleeve can rise with the fixed rod until it is close to the locking component. Since the protective sleeve covers the tip, it will push the ramp plate and the rotating plate to move relative to each other. At this time, the fixed rod can pass through the movable hole. On the other hand, when the piston plate moves quickly, the protective sleeve begins to slide outside the guide groove, exposing the tip until the tip is close to the ramp plate. The locking block can lift the limiting plate, and the lifting part moves the locking pin upward, so that the pin disengages from the insertion hole. After the arc-shaped cover plate loses the limiting of the pin, it begins to flip under the action of gravity, and the vent hole is exposed, ultimately achieving the purpose of timely venting and explosion prevention.

[0045] The beneficial effects of this invention are:

[0046] 1. By setting a piston disc, when the internal air pressure of the switchgear body rises, the piston disc can be pushed to reduce the pressure inside the switchgear body. The slow movement of the piston disc balances the internal air pressure of the switchgear body. When the air pressure rises to a certain level, some gas can be released through the guide hole and pressure relief hole, ultimately achieving the purpose of gradual pressure relief.

[0047] 2. By setting up a protective sleeve and friction parts, on the one hand, the protective sleeve can stay at the tip when the piston plate rises slowly, so that the protective sleeve follows the fixed rod and rises until it is close to the locking component. Since the protective sleeve covers the tip, it will push the ramp plate and the rotating plate to move relative to each other. At this time, the fixed rod can pass through the movable hole. On the other hand, when the piston plate moves quickly, the protective sleeve begins to slide outside the guide groove, exposing the tip until the tip is close to the ramp plate. The locking block can lift the limiting plate, and the lifting component moves the locking pin upward, so that the pin disengages from the insertion hole. After the arc-shaped cover plate loses the limiting of the pin, it begins to flip under the action of gravity, and the vent hole is exposed, ultimately achieving the purpose of timely venting and explosion prevention.

[0048] 3. By setting up a powder storage box, rotating shaft, triggering element, and stirring plate, when the piston plate moves up and down repeatedly due to the influence of air pressure, it will pull the rotating shaft to rotate through the rope roller, thereby causing the stirring plate to rotate frequently and stirring the extinguishing powder, effectively preventing it from clumping and reducing its extinguishing function; when the piston plate is subjected to a huge impact force, the huge pulling force will also cause the rupture plate to detach from the powder storage box, and the heat insulation bag will also be torn, ultimately causing the extinguishing powder to fall and extinguish the fire inside the powder storage box, effectively suppressing the flames. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0050] Figure 2 This is a schematic diagram of the internal structure of the pressure relief unit in Embodiment 1 of the present invention;

[0051] Figure 3 This is a schematic cross-sectional view of the piston disk in Embodiment 1 of the present invention;

[0052] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0053] Figure 5 This is a schematic diagram of the external structure of the fixed cylinder in Embodiment 2 of the present invention;

[0054] Figure 6 This is a cross-sectional view of the fixed cylinder structure in Embodiment 2 of the present invention;

[0055] Figure 7 This is a schematic diagram of the cracked structure of the pin component in Embodiment 2 of the present invention;

[0056] Figure 8 This is a schematic diagram of the pin component structure in Embodiment 2 of the present invention.

[0057] Figure 9 This is Embodiment 2 of the present invention. Figure 8 A magnified structural diagram at point A;

[0058] Figure 10 This is a schematic diagram of the overall structure of the locking assembly according to Embodiment 2 of the present invention;

[0059] Figure 11 This is a partial structural diagram of the locking assembly according to Embodiment 2 of the present invention;

[0060] Figure 12 This is a schematic diagram of the overall structure of Embodiment 3 of the present invention;

[0061] Figure 13 This is a schematic diagram of the external structure of the fire extinguishing unit in Embodiment 3 of the present invention;

[0062] Figure 14 This is a schematic diagram of the internal structure of the fire extinguishing unit in Embodiment 3 of the present invention;

[0063] Figure 15 This is a schematic diagram of the internal structure of the powder storage box in Embodiment 3 of the present invention;

[0064] Figure 16 This is Embodiment 3 of the present invention. Figure 15 A magnified structural diagram at point B.

[0065] In the picture:

[0066] 1. Switch cabinet body; 2. Pressure relief unit; 21. Pressure relief component; 211. Fixing cylinder; 212. Pressure relief hole; 213. Piston plate; 214. Guide hole; 22. Limiting component; 221. Slide plate; 222. First magnet; 223. Limiting plate; 224. Locking assembly; 225. Second magnet; 226. Movable hole; 2241. Rotating plate; 2242. Elastic element; 2243. Ramp plate; 2244. Locking block; 3. Explosion-proof unit; 31. Pin component; 311. Fixing rod; 3111. Tip. 3112. Curved section; 3113. Friction section; 3114. Vertical section; 312. Guide groove; 313. Protective sleeve; 32. Opening assembly; 321. Lifting component; 322. Locking pin; 323. Vent hole; 324. Arc-shaped cover plate; 4. Fire extinguishing unit; 41. Powder spraying component; 411. Powder storage box; 412. Break plate; 413. Adhesive layer; 414. Trigger; 42. Stirring component; 421. Rotating shaft; 422. Spring winding; 423. Winding roller; 424. Spline groove; 425. Stirring plate. Detailed Implementation

[0067] 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.

[0068] Example 1, referring to Figure 1The first embodiment of the present invention provides an environmentally friendly gas-insulated switchgear for power distribution networks, including a switchgear body 1 and a pressure relief unit 2; the pressure relief unit 2 is disposed on the top of the switchgear body 1 and is used to release the gas inside the switchgear body 1.

[0069] Specifically, an environmentally friendly gas-insulated switchgear for power distribution networks includes a switchgear body 1, which is filled with insulating gas, currently mainly SF6 gas, but dry gas can also be used as a substitute. By selecting an insulating gas, the switchgear body 1 can be insulated more efficiently, thereby improving its safety.

[0070] Reference Figure 2-3 It also includes a pressure relief unit 2; the pressure relief unit 2 is disposed on the top of the switch cabinet body 1 and is used to release the gas inside the switch cabinet body 1; the pressure relief unit 2 includes: a pressure relief component 21 disposed on the top of the switch cabinet body 1 and is used to relieve pressure on the high-voltage switch cabinet body 1; the pressure relief component 21 includes: a fixed cylinder 211 disposed on the top of the switch cabinet body 1, and the top and bottom of the fixed cylinder 211 are open; a pressure relief hole 212 disposed on the fixed cylinder 211; a piston disc 213 disposed on the inner wall of the fixed cylinder 211 that can be raised and lowered; and a guide hole 214 disposed at the bottom of the piston disc 213.

[0071] Specifically, it also includes a pressure relief unit 2; the pressure relief unit 2 is installed on the top of the switch cabinet body 1 and is used to release the gas inside the switch cabinet body 1; the pressure relief unit 2 includes: a pressure relief component 21 installed on the top of the switch cabinet body 1 and used to relieve pressure inside the high-voltage switch cabinet body 1; the pressure relief component 21 includes: a fixed cylinder 211 fixedly installed on the top of the switch cabinet body 1, and the top and bottom of the fixed cylinder 211 are open; a pressure relief hole 212 is opened at the outer end of the fixed cylinder 211, the number of pressure relief holes 212 is multiple and they are distributed in a ring, and a piston disc 213 is slidably installed on the inner wall of the fixed cylinder 211. The piston disc 213 includes a movable plate and a sealing ring. The sealing ring is installed at the bottom of the movable plate, and a guide hole 214 is opened at the bottom of the piston disc 213. The inner diameter of the guide hole 214 near the outer end of the movable plate is smaller than the inner diameter of the pressure relief hole 212.

[0072] As the internal air pressure of the switchgear body 1 gradually increases, the gas pressure will push the piston disc 213 to move. The piston disc 213 can play a sealing role. By moving the piston disc 213 upward, the internal air pressure of the switchgear body 1 is reduced, thereby achieving the purpose of primary pressure relief. When the piston disc 213 gradually moves to the position of the pressure relief hole 212, the guide hole 214 and the pressure relief hole 212 are connected, and the gas is released to the outside through the guide hole 214 and the pressure relief hole 212 respectively, thereby achieving the purpose of secondary pressure relief.

[0073] Reference Figure 2The limiting component 22 is disposed inside the fixed cylinder 211 and is used to limit the moving area of ​​the piston disc 213.

[0074] Specifically, the limiting component 22 is fixedly installed inside the fixed cylinder 211 to limit the moving area of ​​the piston disc 213. The limiting component 22 is a fixed plate with a large-diameter air hole in the middle.

[0075] During operation, when the switchgear body 1 is in a hot environment, the internal components of the switchgear body 1 also generate heat, causing the internal temperature of the switchgear body 1 to gradually rise, resulting in a gradual increase in internal air pressure. Since the limit plate 223 has air holes, the gas pressure will push the piston disc 213 to move. The piston disc 213 can act as a seal. By moving the piston disc 213, the internal air pressure of the switchgear body 1 is reduced, thus achieving the purpose of primary pressure relief. However, since the piston disc 213 only slides and does not release the insulating gas inside the switchgear body 1, subsequent maintenance personnel... No need to refill the insulating gas; when the piston disc 213 continues to move to the position of the pressure relief hole 212, the guide hole 214 corresponds to the position of the pressure relief hole 212, and the gas is released to the outside through the through guide hole 214 and the pressure relief hole 212 respectively, thereby achieving the purpose of secondary pressure relief; at this time, it is time to release the insulating gas. If the gas is not released in time, it may damage the internal components. Timely gas release plays a protective role for the internal components. Finally, by setting a fixing plate, the piston disc 213 can be prevented from disengaging from the fixing cylinder 211, which serves as a limit.

[0076] Example 2, refer to Figure 4-8 This is the second embodiment of the present invention, which differs from the first embodiment in that it further includes an explosion-proof unit 3. The explosion-proof unit 3 is disposed inside the pressure relief unit 2 and is used to release pressure in a timely manner when the air pressure surges. The explosion-proof unit 3 includes a pin component 31 disposed on the top of the piston disc 213, which can push the limiting plate 223 to move when the speed is too fast. The pin component 31 includes a fixing rod 311 disposed on the top of the piston disc 213; a guide groove 312 disposed outside the fixing rod 311; and a protective sleeve 313 disposed outside the fixing rod 311. The fixing rod 311 includes a tip portion 3111 disposed inside the protective sleeve 313, a curved portion 3112 disposed at the bottom end of the tip portion 3111, a friction portion 3113 disposed inside the guide groove 312, and a vertical portion 3114 disposed at the bottom end of the curved portion 3112.

[0077] Specifically, it also includes an explosion-proof unit 3; the explosion-proof unit 3 is located inside the pressure relief unit 2 and is used to release pressure in time when the gas pressure surges; the explosion-proof unit 3 includes: a pin component 31 located on the top of the piston disc 213, which can push the limit plate 223 to move when the speed is too fast; the pin component 31 includes: a fixing rod 311 fixedly installed on the top of the piston disc 213; a guide groove 312 opened on the outside of the fixing rod 311; a protective sleeve 313 sliding on the outside of the fixing rod 311, and a guide slider 314 fixedly connected to the inner side of the protective sleeve 313. 4. Slides within the guide groove 312; the fixed rod 311 includes a tip 3111 located inside the protective sleeve 313, a curved part 3112 connected to the bottom of the tip 3111, a friction part 3113 connected inside the guide groove 312, and a vertical part 3114 connected to the bottom of the curved part 3112. The curved part 3112 serves to change the outer diameter of the fixed rod 311. The friction part 3113 is a friction groove. The guide slider 314 also has friction grooves on the side near the fixed rod 311, using friction to support the protective sleeve 313.

[0078] When the piston disc 213 rises slowly and at a constant speed, the protective sleeve 313 remains at the tip 3111 under the action of the friction part 3113. When the piston disc 213 moves quickly, the protective sleeve 313 moves relative to the piston disc 213 under the action of inertia, and gradually moves to the curved part 3112, thereby exposing the tip 3111.

[0079] Reference Figure 6 The limiting component 22 includes: a sliding plate 221 disposed on the inner wall of the fixed cylinder 211; a first magnet 222 disposed on the inner wall of the fixed cylinder 211 and located at the bottom of the sliding plate 221; a limiting plate 223 disposed inside the fixed cylinder 211; a second magnet 225 disposed at the outer end of the limiting plate 223; a movable hole 226 disposed on the limiting plate 223; and a locking assembly 224 disposed on the movable hole 226.

[0080] Specifically, the limiting component 22 includes: a sliding plate 221 fixedly installed on the inner wall of the fixed cylinder 211; a first magnet 222 installed on the inner wall of the fixed cylinder 211 and located at the bottom of the sliding plate 221, with the inner diameter of the first magnet 222 and the sliding plate 221 being the same; a limiting plate 223 slidably disposed inside the fixed cylinder 211; a second magnet 225 installed on the outer end of the limiting plate 223; a movable hole 226 opened on the limiting plate 223; and a locking assembly 224 disposed on the movable hole 226.

[0081] By setting a first magnet 222 and a second magnet 225, the attraction between the first magnet 222 and the second magnet 225 is used to initially limit the position of the limiting plate 223. The attraction is slightly greater than the weight of the limiting plate 223. When the impact force on the limiting plate 223 is too large, it can break through the attraction between the first magnet 222 and the second magnet 225, causing the limiting plate 223 to start moving upward. The limiting plate 223 begins to take the second magnet 225 away from the first magnet 222 and slide to the inside of the slide plate 221.

[0082] Reference Figure 9-10 The locking assembly 224 includes: a rotating plate 2241 disposed inside the movable hole 226 (the outer periphery of the rotating plate 2241 and the inner periphery nested in the movable hole are rotatable relative to each other); an elastic member 2242 disposed on one side of the rotating plate 2241; a ramp plate 2243 disposed on one side of the elastic member 2242; and a locking block 2244 disposed on one side of the ramp plate 2243, wherein the locking block 2244 is adapted to the guide groove 312.

[0083] Specifically, the locking assembly 224 includes: a rotating plate 2241 rotatably mounted inside the movable hole 226; an elastic member 2242 mounted on one side of the rotating plate 2241, the elastic member 2242 including a telescopic plate and a return spring located inside the telescopic plate; a ramp plate 2243 mounted on one side of the elastic member 2242; and a locking block 2244 mounted on one side of the ramp plate 2243, wherein the locking block 2244 is adapted to the guide groove 312, the top view cross section of the locking block 2244 is trapezoidal, and the side closer to the ramp plate 2243 is the short side.

[0084] When the protective sleeve 313 moves to the position of the ramp 2243, it pushes the ramp 2243 and the rotating plate 2241 to move relative to each other. At this time, the movable hole 226 can pass through. When the locking block 2244 enters the guide groove 312, it will be moved by the fixing rod 311. At this time, the rotating plate 2241 cannot move. Continue to increase the thrust, forcing the slide plate 221 to move upward.

[0085] Reference Figure 5-6 The cover opening component is located on the outside of the fixed cylinder 211 and is used for large-area pressure relief to prevent the switch cabinet body 1 from exploding. The cover opening component 32 includes: a lifting member 321 located on the top of the slide plate 221; a locking pin 322 located at the lower end of the lifting member 321; a vent hole 323 located on the fixed cylinder 211; an arc-shaped cover plate 324 covering the vent hole 323; and an insertion hole located on the top of the arc-shaped cover plate 324, with the locking pin 322 inserted inside the insertion hole.

[0086] Specifically, the cover opening component is located on the outside of the fixed cylinder 211 for large-area pressure relief to prevent the switch cabinet body 1 from exploding; the cover opening assembly 32 includes: a lifting member 321 installed on the top of the slide plate 221; a locking pin 322 connected to the end of the lifting member 321; a vent hole 323 opened on the outside of the fixed cylinder 211; an arc-shaped cover plate 324 rotatably installed on the vent hole 323 at the bottom; and an insertion hole opened on the top of the arc-shaped cover plate 324, with the locking pin 322 located inside the insertion hole.

[0087] When the slide plate 221 moves upward, the lifting member 321 moves the locking pin 322 upward, causing the pin to disengage from the insertion hole. After the arc-shaped cover plate 324 loses the limit of the pin, it begins to flip under the action of gravity. The arc-shaped cover plate 324 no longer blocks the vent hole 323, thus exposing the vent hole 323.

[0088] During use, the internal air pressure of the switch cabinet body 1 gradually increases, and the gas pressure will push the piston disc 213 to move. When the piston disc 213 rises slowly and uniformly, the protective sleeve 313 stops at the tip 3111 under the action of the friction part 3113. The protective sleeve 313 rises with the fixing rod 311 until it approaches the locking part. Since the protective sleeve 313 covers the tip 3111, the protective sleeve 313 will push the ramp plate 2243 and the rotating plate 2241 to move relative to each other. At this time, the fixed rod 311 can pass through the movable hole 226 until the piston disc 213 approaches the limit plate 223. The internal gas guide hole 214 and the pressure relief hole 212 are released to the outside, thereby achieving the purpose of step-by-step pressure relief.

[0089] When the piston disc 213 is subjected to a huge impact, it will move upward rapidly. Under the action of inertia, the protective sleeve 313 begins to slide outside the guide groove 312, exposing the tip 3111. Until the tip 3111 approaches the ramp plate 2243, the ramp plate 2243 is forced to extend and retract the elastic element 2242. Finally, the locking block 2244 smoothly slides into the guide groove 312. Since the locking block 2244 has a trapezoidal cross-section when viewed from above, and the side closest to the ramp plate 2243 is the shorter side, the number of locking blocks 2244... There can be four locking blocks 2244. When all four locking blocks 2244 slide into the guide groove 312, the fixing rod 311 will move the locking plate upward in parallel, so that the limiting plate 223 will rise accordingly, breaking through the attraction between the first magnet 222 and the second magnet 225, thereby forcing the lifting member 321 to move upward with the locking pin 322, so that the pin will disengage from the insertion hole. After the arc-shaped cover plate 324 loses the limitation of the pin, it begins to flip under the action of gravity, and the vent hole 323 is exposed, ultimately achieving the purpose of timely venting and explosion prevention.

[0090] The remaining structure is the same as that in Example 1.

[0091] Example 3, referring to Figure 11-12 , Figure 14 This is the third embodiment of the present invention, which differs from the second embodiment in that it further includes a fire extinguishing unit 4 for extinguishing flames inside the switch cabinet body 1. The fire extinguishing unit 4 includes a powder spraying component 41 disposed below the piston disc 213 for spraying fire extinguishing dust. The powder spraying component 41 includes: a powder storage box 411 disposed at the top inside the switch cabinet body 1; a heat insulation bag disposed inside the powder storage box 411; fire extinguishing powder disposed inside the heat insulation bag; a rupture plate 412 disposed at the bottom of the powder storage box 411 (the bottom of the powder storage box 411 is an opening, and the rupture plate 412 closes the opening), and an adhesive layer 413 is disposed between the rupture plate 412 and the powder storage box 411; and a trigger 414 disposed at one end at the bottom of the piston disc 213.

[0092] Specifically, it also includes a fire extinguishing unit 4 for extinguishing flames inside the switchgear body 1; the fire extinguishing unit 4 includes a powder spraying component 41 located at the bottom of the piston plate 213 for spraying fire extinguishing dust; the powder spraying component 41 includes: a powder storage box 411 installed at the top inside the switchgear body 1; a heat insulation bag located inside the powder storage box 411, made of tin foil material, which is heat-insulating and easily broken, and tightly attached to the inner wall of the powder storage box 411; fire extinguishing powder (specifically dry powder, which is composed of sodium bicarbonate and a small amount of moisture-proofing agents such as magnesium stearate and talc) located inside the heat insulation bag; a perforated plate 412 located at the bottom of the powder storage box 411, and an adhesive layer 413 is provided between the perforated plate 412 and the powder storage box 411; and a trigger 414 connected to the bottom of the piston plate 213.

[0093] During the up-and-down movement of the piston plate, the trigger 414 remains in a relaxed state. When the piston plate moves rapidly and pushes the slide plate 221 to move, it will pull the breach plate 412 away from the powder storage box 411, causing the extinguishing powder inside to fall and extinguish the flames.

[0094] Reference Figure 13-15 The stirring component 42 includes: a rotating shaft 421 disposed on one side of the breaking plate 412 and extending movably into the interior of the powder storage box 411; a spring coil 422 disposed outside the rotating shaft 421; a winding roller 423 disposed outside the rotating shaft 421, with the other end of the trigger member 414 wound around the outside of the winding roller 423; a spline groove 424 disposed on the top of the rotating shaft 421; and a stirring plate 425 disposed at the outer end of the rotating shaft 421.

[0095] Specifically, the stirring component 42 includes: a rotating shaft 421 rotatably mounted on one side of the breaking plate 412 and extending into the interior of the powder storage box 411; a spring coil 422 with one end connected to the outside of the rotating shaft 421 and the other end connected to one side of the breaking plate 412; a rope winding roller 423 fixedly sleeved on the outside of the rotating shaft 421, with the other end of the trigger 414 wound around the outside of the rope winding roller 423; a spline groove 424 formed on the top of the rotating shaft 421; and a stirring plate 425 mounted on the outer end of the rotating shaft 421, with multiple small holes formed on the stirring plate 425.

[0096] When the trigger 414 pulls the rope roller 423 to rotate repeatedly (when the trigger 414 pulls the rope roller 423 to rotate in one direction, the spring 422 retracts and rotates in the opposite direction), the rope roller 423 rotates through the shaft 421 with multiple stirring plates 425. The stirring plates 425 are used to stir the extinguishing powder, thereby effectively preventing it from clumping, making it difficult to fall, and affecting the extinguishing effect.

[0097] During use, when the piston plate moves up and down repeatedly due to the influence of air pressure, it will pull the rotating shaft 421 to rotate via the rope roller 423, thereby causing the stirring plate 425 to rotate frequently, stirring the extinguishing powder and effectively preventing it from clumping and reducing its extinguishing function. When the piston plate is subjected to a huge impact force, it will not only hit the limiting plate 223 and deviate, but the huge pulling force will also cause the breaking plate 412 to detach from the powder storage box 411, and the heat insulation bag will also be torn, ultimately causing the extinguishing powder to fall and extinguish the fire inside the powder storage box 411, effectively suppressing the flames.

[0098] The remaining structure is the same as that in Example 2.

[0099] Example 4, refer to Figure 1-15 The fourth embodiment of the present invention provides a method for operating an environmentally friendly gas-insulated switchgear for power distribution networks, comprising the following steps:

[0100] S1, the internal air pressure of the switch cabinet body 1 gradually increases, and the gas pressure will push the piston plate 213 to move upward. Since the limit plate 223 has air holes, the gas pressure will push the piston plate 213 to move. The piston plate 213 can play a sealing role. By moving the piston plate 213, the internal air pressure of the switch cabinet body 1 is reduced, thereby achieving the purpose of first-level pressure relief.

[0101] S2, when the piston disc 213 rises slowly and uniformly, the protective sleeve 313 stays at the tip 3111 under the action of the friction part 3113. The protective sleeve 313 rises with the fixing rod 311 until it approaches the locking part. Since the protective sleeve 313 covers the tip 3111, the protective sleeve 313 will push the ramp plate 2243 and the rotating plate 2241 to move relative to each other. At this time, the fixed rod 311 can pass through the movable hole 226 until the piston disc 213 approaches the limiting plate 223. The internal gas guide hole 214 and the pressure relief hole 212 are released to the outside, thereby achieving the purpose of step-by-step pressure relief.

[0102] S3, when the piston plate moves up and down repeatedly due to the influence of air pressure, it will pull the rotating shaft 421 to rotate through the rope roller 423, thereby causing the stirring plate 425 to rotate frequently, stirring the extinguishing powder, effectively preventing it from clumping and reducing the extinguishing function.

[0103] S4, when the piston disc 213 is subjected to a huge impact, it will move upward rapidly. Under the action of inertia, the protective sleeve 313 begins to slide outside the guide groove 312, exposing the tip 3111 until the tip 3111 approaches the ramp plate 2243. The ramp plate 2243 is forced to push the elastic element 2242 to extend and retract. Finally, the locking block 2244 smoothly slides into the guide groove 312. Since the locking block 2244 has a trapezoidal cross section when viewed from above, and the side near the ramp plate 2243 is the short side, when the locking block 2244 slides into the guide groove 312, the fixing rod 311 will move upward in parallel with the locking plate, breaking through the attraction between the first magnet 222 and the second magnet 225, so that the limiting plate 223 follows and rises.

[0104] S5, the limiting plate 223 forces the lifting member 321 to move upward with the locking pin 322, so that the pin is disengaged from the insertion hole. After the arc-shaped cover plate 324 loses the limiting of the pin, it begins to flip under the action of gravity, and the vent 323 is exposed, thus achieving the purpose of timely large-area venting and depressurization.

[0105] S6, when the piston plate is subjected to a huge impact force, it not only hits the limiting plate 223 and deviates, but the huge pulling force will also take the rupture plate 412 away from the powder storage box 411, and the heat insulation bag will also be torn, ultimately causing the extinguishing powder to fall and extinguish the fire inside the powder storage box 411, effectively suppressing the flames.

Claims

1. An environmentally friendly gas-insulated switchgear for power distribution networks, comprising a switchgear body (1), characterized in that: It also includes a pressure relief unit (2); The pressure relief unit (2) is located on the top of the switch cabinet body (1) and is used to release the gas inside the switch cabinet body (1); The pressure relief unit (2) includes: a pressure relief component (21) and a limiting component (22) disposed on the top of the switch cabinet body (1), wherein the pressure relief component (21) is used to relieve pressure on the high-voltage switch cabinet body (1); The pressure relief component (21) includes: a fixed cylinder (211) disposed on the top of the switch cabinet body (1), with the top and bottom being open; a pressure relief hole (212) disposed on the fixed cylinder (211); a piston disc (213) disposed on the inner wall of the fixed cylinder (211) that can be raised and lowered; and a guide hole (214) disposed at the bottom of the piston disc (213). The limiting component (22) is disposed inside the fixed cylinder (211) and is used to limit the moving area of ​​the piston disc (213); it also includes an explosion-proof unit (3). The explosion-proof unit (3) is located inside the pressure relief unit (2) and is used to relieve pressure in time when the air pressure surges. The explosion-proof unit (3) includes: a pin component (31) disposed on the top of the piston disc (213), which can push the limit plate (223) to move when the speed is too fast; The pin component (31) includes: a fixing rod (311) disposed on the top of the piston disc (213); a guide groove (312) disposed on the outside of the fixing rod (311); a protective sleeve (313) disposed on the outside of the fixing rod (311); and a guide slider (314) disposed on the inside of the protective sleeve (313). The cover opening assembly is located on the outside of the fixed cylinder (211) for large-area pressure relief to prevent the switch cabinet body (1) from exploding; the fixed rod (311) includes a tip (3111) located inside the protective sleeve (313), a curved part (3112) located at the bottom of the tip (3111), a friction part (3113) located inside the guide groove (312), and a vertical part (3114) located at the bottom of the curved part (3112); the limiting component (22) includes Includes: a sliding plate (221) disposed on the inner wall of the fixed cylinder (211); a first magnet (222) disposed on the inner wall of the fixed cylinder (211) and located at the bottom of the sliding plate (221); a limiting plate (223) disposed inside the fixed cylinder (211); a second magnet (225) disposed at the outer end of the limiting plate (223) and interacting with the first magnet; an movable hole (226) disposed on the limiting plate (223); and a locking assembly (224) disposed on the movable hole (226).

2. The environmentally friendly gas-insulated switchgear for power distribution networks according to claim 1, characterized in that: The locking assembly (224) includes: a rotating plate (2241) disposed inside the movable hole (226); an elastic element (2242) disposed on one side of the rotating plate (2241); a ramp plate (2243) disposed on one side of the elastic element (2242); and a locking block (2244) disposed on one side of the ramp plate (2243), wherein the locking block (2244) is adapted to the guide groove (312).

3. The environmentally friendly gas-insulated switchgear for power distribution networks according to claim 2, characterized in that: The cover opening assembly (32) includes: a lifting member (321) disposed on the top of the slide plate (221); a locking pin (322) disposed at the lower end of the lifting member; a vent hole (323) disposed on the fixed cylinder (211); an arc-shaped cover plate (324) covering the vent hole (323); and an insertion hole disposed on the top of the arc-shaped cover plate (324), wherein the locking pin (322) is inserted into the insertion hole.

4. The environmentally friendly gas insulated switchgear for power distribution network according to claim 3, characterized in that: It also includes a fire extinguishing unit (4); used to extinguish flames inside the switch cabinet body (1); The fire extinguishing unit (4) includes a powder spraying component (41) located below the piston disc (213) for spraying fire extinguishing dust; The powder spraying component (41) includes: a powder storage box (411) disposed at the top of the switch cabinet body (1); a heat insulation bag disposed inside the powder storage box (411); fire extinguishing powder disposed inside the heat insulation bag; a rupture plate (412) disposed at the bottom of the powder storage box (411), and an adhesive layer (413) disposed between the rupture plate (412) and the powder storage box (411); and a trigger (414) disposed at one end at the bottom of the piston plate (213). A stirring component (42) is disposed outside the breach plate (412) and is used to stir the fire extinguishing powder.

5. The environmentally friendly gas insulated switchgear for power distribution network according to claim 4, characterized in that: The stirring component (42) includes: a rotating shaft (421) disposed on one side of the rupture plate (412) and extending movably into the interior of the powder storage box (411); a spring coil (422) disposed outside the rotating shaft (421); a winding roller (423) disposed outside the rotating shaft (421), with the other end of the trigger (414) wound around the outside of the winding roller (423); a spline groove (424) disposed on the top of the rotating shaft (421); and a stirring plate (425) disposed at the outer end of the rotating shaft (421).

6. A working method of the environmentally friendly gas insulated switchgear for power distribution network using the environmentally friendly gas insulated switchgear for power distribution network as claimed in claim 5, wherein: Includes the following steps, The air pressure inside the switch cabinet body (1) rises, pushing the piston disc (213) to move slowly upward, balancing the air pressure inside the switch cabinet body (1); The internal air pressure of the switch cabinet body (1) continues to rise, and the piston plate (213) continues to move upward; When the piston disc (213) moves to the position of the limiting component (22), the piston disc (213) approaches the pressure relief hole (212). At this time, the gas inside the switch cabinet body (1) can be released to the outside through the connection between the guide hole (214) and the pressure relief hole (212), which achieves the purpose of secondary pressure relief.

7. The operating method of the environmentally friendly gas-insulated switchgear for power distribution networks according to claim 6, characterized in that: The internal air pressure of the switch cabinet body (1) gradually increases, and the gas pressure will push the piston plate (213) to continue to move upward. When the piston plate (213) rises slowly and uniformly, the protective sleeve (313) stays at the tip (3111) under the action of the friction part (3113), and the protective sleeve (313) rises with the fixed rod (311). As the locking assembly approaches, the protective sleeve (313) will push the ramp plate (2243) and the rotating plate (2241) to move relative to each other. At this time, the fixed rod (311) is allowed to pass through the movable hole (226) until the piston plate (213) approaches the limit plate (223). The internal gas is released to the outside through the guide hole (214) and the pressure relief hole (212). When the piston disc (213) is subjected to a huge impact, it will move upward rapidly. Under the action of inertia, the protective sleeve (313) begins to slide outside the guide groove (312), exposing the tip (3111). The tip (3111) approaches the ramp plate (2243), and the ramp plate (2243) is pushed by the force to extend and retract the elastic element (2242). Finally, the locking block (2244) smoothly slides into the guide groove (312), and the fixing rod (311) will move the locking plate upward in parallel, breaking through the attraction between the first magnet (222) and the second magnet (225), and the limiting plate (223) will move upward. The limiting plate (223) forces the lifting member (321) to move upward with the locking pin (322), causing the locking pin to disengage from the insertion hole. After the arc-shaped cover plate (324) loses the limiting of the locking pin, it begins to flip under the action of gravity, and the vent hole (323) is exposed, thus enabling large-area venting and explosion prevention. When the piston disc moves up and down repeatedly due to the influence of air pressure, it will pull the rotating shaft (421) to rotate through the rope roller (423), thereby causing the stirring plate (425) to rotate frequently and stir the extinguishing powder. When the piston disc is subjected to a huge impact force, it not only impacts the limiting plate (223) and deviates, but the huge pulling force will also cause the rupture plate (412) to detach from the powder storage box (411), and the heat insulation bag will also be torn, ultimately causing the extinguishing powder to fall and extinguish the fire inside the powder storage box (411).

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