A power system safety protection device

Abstract

The application provides a kind of electric power system safety protection device, effectively improve the arc extinguishing performance of circuit breaker, its technical scheme is to solve, including circuit breaker shell and multiple wiring ends, two corresponding wiring ends are respectively fixedly connected with static contact and movable contact slip ring, arc chamber is fixedly connected in the circuit breaker shell, movable contact is slidably connected in the arc chamber, movable contact and movable contact slip ring are slidably connected, operating chamber is fixedly connected on the circuit breaker shell, movable contact is fixedly connected with insulating rod, drive mechanism for driving insulating rod to move transversely is arranged in operating chamber, multiple piston discs are slidably connected in the arc chamber, one-way drive mechanism for driving each piston disc to move is arranged on movable contact, blowing arc extinguishing mechanism is arranged in the circuit breaker shell, movable contact and insulating rod are hollow structure, inert gas is filled in the circuit breaker shell and arc chamber, the arc extinguishing performance of circuit breaker can be improved and the maintenance frequency is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power safety, in particular to a power system safety protection device. BACKGROUND

[0002] The high-voltage circuit breaker is a common power system safety protection device, which can not only cut off or close the no-load current and load current in the high-voltage circuit, but also cut off the overload current and short-circuit current through the action of the relay protection device when the system fails. The high-voltage circuit breaker has a quite perfect arc extinguishing structure and sufficient breaking capacity. Arc extinguishing is one of the primary applications of the circuit breaker, because the arc not only causes damage to the equipment line, but also affects personal safety. The sulfur hexafluoride circuit breaker is widely used in high-voltage circuit breakers. The sulfur hexafluoride circuit breaker is a circuit breaker that uses sulfur hexafluoride gas as an arc-extinguishing medium and an insulating medium. Sulfur hexafluoride is a gas medium with high insulation strength and good arc-extinguishing performance, and its arc-extinguishing capacity is 100 times higher than that of air. Moreover, it can quickly restore insulation after arc extinction. However, in the existing sulfur hexafluoride circuit breaker, the sulfur hexafluoride gas is circulated in a closed system during the arc blowing process. In the long-term operation, sulfur hexafluoride and its own moisture will produce some toxic gases under the action of the arc. On the one hand, the toxic gases affect the purity of the sulfur hexafluoride gas, and the sulfur hexafluoride gas mixture doped with toxic gases reduces the insulation performance of the sulfur hexafluoride gas and the arc-extinguishing performance of the sulfur hexafluoride gas, thereby reducing the arc-extinguishing performance of the sulfur hexafluoride circuit breaker and easily causing safety accidents. On the other hand, the toxic gases inside the sulfur hexafluoride circuit breaker will seriously affect the health of the maintenance personnel during the regular maintenance of the sulfur hexafluoride circuit breaker, endangering the personal safety of the maintenance personnel. Moreover, the existing method for handling the excessive toxic gases and decomposition products inside the sulfur hexafluoride circuit breaker generally involves power outage and vacuum treatment, which not only occupies a lot of manpower and resources, but also is not conducive to the stable operation of the power grid, and causes waste of sulfur hexafluoride gas. SUMMARY

[0003] In view of the above, in order to overcome the defects of the prior art, the present application provides a power system safety protection device, by setting the blowing arc extinguishing mechanism inside the circuit breaker shell, when the circuit breaker is operated, the blowing arc extinguishing mechanism blows out pure sulfur hexafluoride gas inside the insulating nozzle, effectively ensuring the arc extinguishing performance of the circuit breaker, and during the closing process of the circuit breaker, the piston disc closest to the static contact moves towards the static contact and extrudes the gas between the piston disc closest to the static contact and the arc chamber, so that the toxic gas generated by the sulfur hexafluoride gas under the action of the arc is extruded and collected into the waste gas tank through the internal channel of the moving contact, effectively improving the purity of the sulfur hexafluoride gas inside the arc chamber, thereby improving the insulation performance and arc extinguishing performance of the sulfur hexafluoride gas, ensuring the arc extinguishing performance of the circuit breaker and avoiding safety accidents, the toxic gas generated by the sulfur hexafluoride gas under the action of the arc is discharged from the arc chamber and the internal channel of the moving contact and collected into the waste gas tank through each closing operation of the circuit breaker, effectively avoiding the situation that the toxic gas inside the circuit breaker affects the health of the maintenance personnel during the regular maintenance of the sulfur hexafluoride circuit breaker, by setting multiple piston discs to divide the arc chamber into multiple chambers, each chamber is filled with a certain pressure of pure sulfur hexafluoride gas, and the piston is moved by the closing operation of the circuit breaker each time, since the gas between the piston disc closest to the static contact and the arc chamber inevitably contains toxic gas, after multiple closing operations, the piston disc closest to the static contact and the pot-type insulator are attracted together by the magnet, so that the gas between the piston disc closest to the static contact and the arc chamber is completely collected into the waste gas tank through the internal channel of the moving contact, and at this time the static contact is in the cavity between the piston disc closest to the static contact and the adjacent piston disc, and the cavity is filled with pure sulfur hexafluoride gas, which not only further improves the purity of the sulfur hexafluoride gas and ensures the insulation performance and arc extinguishing performance of the sulfur hexafluoride gas, but also completely discharges the residual toxic gas, reduces the maintenance frequency of the circuit breaker, and does not need to be powered off, reducing the consumption of manpower and material resources, which is conducive to the stable operation of the power grid, and avoids the waste of sulfur hexafluoride gas caused by frequent maintenance.

[0004] The technical scheme is solved, comprising a circuit breaker shell, an insulating sleeve and a plurality of wiring terminals, characterized in that the two corresponding wiring terminals are respectively fixedly connected with a static contact and a moving contact slip ring which pass through the corresponding insulating sleeve downward and extend into the inside of the circuit breaker shell, a arc extinguishing cavity is fixedly connected in the inside of the circuit breaker shell, the static contact extends into the inside of the arc extinguishing cavity, a moving contact which cooperates with the static contact is transversely and slidably connected in the inside of the arc extinguishing cavity, the end of the moving contact away from the static contact extends out of the inside of the arc extinguishing cavity and is slidably connected with the moving contact slip ring, an operating chamber is fixedly connected on the circuit breaker shell, the end of the moving contact away from the static contact is fixedly connected with an insulating rod which extends into the inside of the operating chamber, a driving mechanism which drives the insulating rod to move transversely is arranged in the inside of the operating chamber, a plurality of piston discs which are slidably connected with the moving contact are transversely and slidably connected in the inside of the arc extinguishing cavity, each adjacent piston disc is connected with each other and slidably cooperates, a one-way driving mechanism which drives each piston disc to move towards the static contact is arranged on the moving contact, a blowing arc extinguishing mechanism is arranged in the inside of the circuit breaker shell, the moving contact and the insulating rod are hollow structures and are connected with a waste gas tank which is located in the inside of the operating chamber through a pipeline, the circuit breaker shell and the arc extinguishing cavity are filled with inert gas with a certain pressure.

[0005] As a preferred, the blowing arc extinguishing mechanism comprises an insulating nozzle arranged on the end of the moving contact close to the static contact, a blowing channel which is communicated with the inside cavity of the insulating nozzle is symmetrically arranged on the inside of the moving contact, a hollow piston rod which extends into the inside of the arc extinguishing cavity is symmetrically fixedly connected on the outer wall of the moving contact, the middle part of each hollow piston rod is transversely arranged and is slidably connected with the outer wall of the arc extinguishing cavity, a gas supply cavity is symmetrically fixedly connected on the outer wall of the arc extinguishing cavity, a piston is fixedly connected on the end of each hollow piston rod which extends into the inside of the arc extinguishing cavity, each piston is slidably connected in the corresponding gas supply cavity, each hollow piston rod is communicated with the corresponding blowing channel, a one-way air inlet valve is arranged at the connection between each hollow piston rod and the corresponding piston, a one-way air inlet valve is arranged on the side wall of each gas supply cavity away from the static contact, a gas supply tank which is located in the inside of the operating chamber is connected with the circuit breaker shell through a pipeline, a one-way air outlet valve is arranged at the connection between the gas supply tank and the pipeline.

[0006] As a preferred, a hollow conductive rod is arranged in the inside of the moving contact, a plurality of conical conductive sheets are fixedly connected on the end of the hollow conductive rod close to the static contact, a ring-shaped clamp spring is sleeved on the outer wall of the plurality of conical conductive sheets, the end of the hollow conductive rod away from the static contact extends into the inside of the arc extinguishing cavity and is slidably connected with the moving contact slip ring.

[0007] As a preferred, the one-way driving mechanism comprises a plurality of slots which are symmetrically and uniformly arranged on the outer wall of the moving contact, a push plate which is consistent with the size of the slot is vertically and rotatably connected in the inside of each slot, the bottom end of each push plate is connected with the lower end surface of the corresponding slot through a spring, a limiting plate is fixedly connected on the upper end surface of each slot away from the static contact.

[0008] Preferably, each of the left and right end faces of each piston disc is fixedly connected with a magnet, and the magnets on the corresponding faces of each adjacent piston disc are magnetically different.

[0009] Preferably, a basin-type insulator is arranged at the position of the static contact in the arc-extinguishing cavity, and a magnet is fixedly connected to the end face of the piston disc close to the basin-type insulator, and the magnet of the basin-type insulator and the magnet on the corresponding face of the piston disc are magnetically different.

[0010] Preferably, the driving mechanism comprises an operating rod rotatably connected to the sidewall of the operating chamber, the operating rod drives a driving sleeve rotatably connected to the inner wall of the operating chamber through gear cooperation, and the driving sleeve drives the insulating rod to move laterally through thread cooperation.

[0011] Preferably, the arc-extinguishing cavity is fixedly connected to the circuit breaker shell through flange plates, and a through hole is formed in each flange plate to make the cavity of each gas supply cavity communicate with the internal cavity of the circuit breaker shell and the gas supply tank.

[0012] Preferably, a one-way air inlet valve is arranged at the connection between the exhaust tank and the pipeline.

[0013] Preferably, the inert gas filled in the circuit breaker shell and the arc-extinguishing cavity is sulfur hexafluoride gas.

[0014] The present application has the following beneficial effects:

[0015] 1. The blowing arc-extinguishing mechanism arranged in the circuit breaker shell ensures that pure sulfur hexafluoride gas is sprayed in the insulating nozzle during the blowing arc-extinguishing process of the blowing arc-extinguishing mechanism when the circuit breaker is in the opening operation, effectively ensuring the arc-extinguishing performance of the circuit breaker, and the piston disc closest to the static contact moves towards the static contact during the closing process of the circuit breaker, extruding the gas between the piston disc closest to the static contact and the arc-extinguishing cavity, so that the toxic gas generated by the sulfur hexafluoride gas under the action of the electric arc is extruded and collected into the exhaust tank through the internal channel of the moving contact, effectively improving the purity of the sulfur hexafluoride gas in the arc-extinguishing cavity, thereby improving the insulation performance and arc-extinguishing performance of the sulfur hexafluoride gas, ensuring the arc-extinguishing performance of the circuit breaker and avoiding safety accidents.

[0016] 2. The toxic gas generated by the sulfur hexafluoride gas under the action of the electric arc is discharged from the arc-extinguishing cavity and the moving contact and collected into the exhaust tank during each closing operation of the circuit breaker, effectively avoiding the situation that the toxic gas in the circuit breaker affects the health of the maintenance personnel during the regular maintenance of the sulfur hexafluoride circuit breaker.

[0017] 3. By setting multiple piston discs, the arc-extinguishing chamber is divided into multiple chambers, each filled with pure sulfur hexafluoride gas at a certain pressure. Each closing operation of the circuit breaker pushes the piston to move. Since the gas between the piston disc closest to the stationary contact and the arc-extinguishing chamber inevitably contains residual toxic gas, after multiple closing operations, the piston disc closest to the stationary contact and the basin insulator are magnetically attracted together, thus completely collecting the gas between the piston disc closest to the stationary contact and the arc-extinguishing chamber through the internal channel of the moving contact into the waste gas tank. At this time, the stationary contact is located in the cavity between the piston disc closest to the stationary contact and the adjacent piston disc, and this cavity is filled with pure sulfur hexafluoride gas. This not only further improves the purity of the sulfur hexafluoride gas, ensuring its insulation and arc-extinguishing performance, but also completely removes residual toxic gas, reducing the frequency of circuit breaker maintenance. Furthermore, it eliminates the need for power outages, reducing the consumption of manpower and resources, which is beneficial to the stable operation of the power grid, and avoids the waste of sulfur hexafluoride gas caused by frequent maintenance. Attached Figure Description

[0018] Figure 1 This is a first-view schematic diagram of the overall invention.

[0019] Figure 2 This is a first-view partial cross-sectional view of the internal structure of the present invention.

[0020] Figure 3 This is a cross-sectional view of the internal structure of the present invention in the closed state.

[0021] Figure 4 This is a cross-sectional view of the internal structure of the present invention in the open state.

[0022] Figure 5 This is a second perspective view of a partial cross-sectional view of the internal structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the moving contact device of the present invention.

[0024] Figure 7 This is a first-view sectional view of the internal structure of the moving contact device of the present invention.

[0025] Figure 8 This is a second perspective view of the internal structure of the moving contact device of the present invention.

[0026] Figure 9 For the present invention Figure 7 A magnified view of part A in the middle.

[0027] Figure 10 This is a schematic diagram showing the connection of multiple piston discs according to the present invention.

[0028] Figure Labels

[0029] 1. Circuit breaker housing, 2. Insulating sleeve, 3. Terminal, 4. Static contact, 5. Moving contact slip ring, 6. Arc extinguishing chamber, 7. Moving contact, 8. Operating chamber, 9. Insulating rod, 10. Piston disc, 11. Exhaust tank, 12. Insulating nozzle, 13. Injection channel, 14. Hollow piston rod, 15. Supply chamber, 16. Piston, 17. Supply tank, 18. Hollow conducting rod, 19. Conical conducting plate, 20. Ring clamp spring, 21. Notch, 22. Push plate, 23. Limiting plate, 24. Magnet, 25. Basin insulator, 26. Operating lever, 27. Drive sleeve. DETAILED DESCRIPTION

[0030] The application will be further described with reference to the drawings attached hereto. Figures 1-10 The application will be further described with reference to the drawings attached hereto.

[0031] The application is used, first of all, the circuit breaker of the application is connected to the power system, the circuit breaker shell 1 is fixedly connected with a plurality of insulating sleeves 2, each insulating sleeve 2 is fixedly connected with a wiring terminal 3, two corresponding wiring terminals 3 are fixedly connected with a static contact 4 and a moving contact sliding ring 5 which pass through the corresponding insulating sleeve 2 downward and extend into the inside of the circuit breaker shell 1, the static contact 4 corresponding wiring terminal 3 connects the incoming line end of the power system, the moving contact sliding ring 5 corresponding wiring terminal 3 connects the outgoing line end of the power system, the inside of the circuit breaker shell 1 is fixedly connected with an arc extinguishing cavity 6, the static contact 4 extends into the inside of the arc extinguishing cavity 6, the inside of the arc extinguishing cavity 6 is transversely slidably connected with a moving contact 7 matched with the static contact 4, the inside of the moving contact 7 is provided with a hollow conductive rod 18, the end of the hollow conductive rod 18 close to the static contact 4 is fixedly connected with a plurality of conical conductive sheets 19, the outer wall of the plurality of conical conductive sheets 19 is sleeved with a ring-shaped clamp spring 20, the end of the hollow conductive rod 18 away from the static contact 4 extends out of the inside of the arc extinguishing cavity 6 and is slidably connected with the moving contact sliding ring 5, the static contact 4 connecting the incoming line end of the power system is always in an energized state, when the moving contact 7 inside the arc extinguishing cavity 6 slides transversely to the corresponding position of the static contact 4, the plurality of conical conductive sheets 19 inside the moving contact 7 contact the static contact 4 and are energized, in order to prevent the plurality of conical conductive sheets 19 from contacting the static contact 4 not tightly and affecting the conductive effect, the ring-shaped clamp spring 20 is sleeved on the outer wall of the plurality of conical conductive sheets 19, the plurality of conical conductive sheets 19 are tightly wrapped around the periphery of the static contact 4 through the tightening force of the ring-shaped clamp spring 20 to ensure the energized effect, the plurality of conical conductive sheets 19 are energized and conduct the current through the hollow conductive rod 18, since the end of the hollow conductive rod 18 extending out of the arc extinguishing cavity 6 is slidably connected with the moving contact sliding ring 5, the moving contact sliding ring 5 is made of conductive material, so that the hollow conductive rod 18 conducts the current to the moving contact sliding ring 5 after being energized, then the moving contact sliding ring 5 conducts the current to the outgoing line end corresponding wiring terminal 3 of the power system, completing the closing process of the power system circuit, when the moving contact 7 inside the arc extinguishing cavity 6 slides transversely away from the position of the static contact 4, the plurality of conical conductive sheets 19 and the hollow conductive rod 18 lose power, so that the moving contact sliding ring 5 and the outgoing line end corresponding wiring terminal 3 of the power system also lose power, completing the opening process of the power system circuit.

[0032] When a fault occurs in the power system circuit, the circuit needs to be disconnected by the circuit breaker, and an arc will be generated between the static contact 4 and the moving contact 7 when the moving contact 7 moves away from the static contact 4, which will not only damage the equipment line but also affect personal safety, so the circuit breaker needs to be arc extinguishing, the operating chamber 8 is fixedly connected to the circuit breaker housing 1, the insulating rod 9 is fixedly connected to the end of the moving contact 7 away from the static contact 4 and extends into the operating chamber 8, the driving mechanism for driving the insulating rod 9 to move horizontally is arranged in the operating chamber 8, the driving mechanism comprises an operating rod 26 rotatably connected to the side wall of the operating chamber 8, the operating rod 26 drives the driving sleeve 27 rotatably connected to the inner wall of the operating chamber 8 through gear cooperation, the driving sleeve 27 drives the insulating rod 9 to move horizontally through thread cooperation, when the power system circuit needs to be disconnected, the operating rod 26 is rotated to the opening position, the operating rod 26 is rotated and drives the driving sleeve 27 on the inner wall of the operating chamber 8 to rotate through gear cooperation, the inner wall of the driving sleeve 27 is provided with threads and cooperates with the insulating rod 9, the operating chamber 8 is fixedly connected with a horizontal guide rod, the insulating rod 9 is in sliding cooperation with the horizontal guide rod, the driving sleeve 27 drives the insulating rod 9 to move horizontally along the horizontal guide rod and move away from the static contact 4 through thread cooperation when the driving sleeve 27 is rotated, the insulating rod 9 moves away from the static contact 4 to drive the moving contact 7 to gradually separate from the static contact 4, an arc will be generated between the moving contact 7 and the static contact 4 during the separation process, the circuit breaker housing 1 is provided with a blowing arc extinguishing mechanism, the circuit breaker housing 1 and the arc extinguishing cavity 6 are filled with sulfur hexafluoride gas with a certain pressure, the sulfur hexafluoride gas serves as arc extinguishing medium and insulation medium, the blowing arc extinguishing mechanism comprises the insulating nozzle 12 arranged at the end of the moving contact 7 close to the static contact 4, the blowing passage 13 is symmetrically arranged on the moving contact 7 and communicates with the internal cavity of the insulating nozzle 12, the hollow piston rod 14 is fixedly connected to the outer wall of the moving contact 7 and extends into the arc extinguishing cavity 6, the middle part of each hollow piston rod 14 is horizontally arranged and is in sliding sealing connection with the outer wall of the arc extinguishing cavity 6, the gas supply cavity 15 is fixedly connected to the outer wall of the arc extinguishing cavity 6, the piston 16 is fixedly connected to the end of each hollow piston rod 14 extending into the arc extinguishing cavity 6, each piston 16 is in sliding connection with the corresponding gas supply cavity 15, each hollow piston rod 14 communicates with the corresponding blowing passage 13, the one-way air inlet valve is arranged at the connection between each hollow piston rod 14 and the corresponding piston 16, the one-way air inlet valve is arranged on the side wall of each gas supply cavity 15 away from the static contact 4, the circuit breaker housing 1 is connected with the gas supply tank 17 in the operating chamber 8 through a pipeline, the one-way air outlet valve is arranged at the connection between the gas supply tank 17 and the pipeline, the gas supply tank 17 is filled with pure sulfur hexafluoride gas with the same pressure as the internal pressure of the circuit breaker housing 1, the inner wall of each gas supply cavity 15 away from the static contact 4 and the corresponding piston 16 are filled with pure sulfur hexafluoride gas with a certain pressure, the insulating nozzle 12 is always located at the periphery of the static contact 4 during the separation process of the moving contact 7 and the static contact 4,After the moving contact 7 and the static contact 4 are completely separated, an arc is generated between them. As the moving contact 7 moves away from the static contact 4, the hollow piston rods 14 fixedly connected symmetrically on the outer wall of the moving contact 7 move away from the static contact 4 synchronously, the pistons 16 on each hollow piston rod 14 move away from the static contact 4 inside the corresponding gas supply cavity 15 and press the pure sulfur hexafluoride gas between the inner wall of the gas supply cavity 15 away from the static contact 4 and the piston 16. Since the connection between each hollow piston rod 14 and the corresponding piston 16 is provided with a one-way inlet valve and the side wall of each gas supply cavity 15 away from the static contact 4 is also provided with a one-way inlet valve, when each piston 16 presses the pure sulfur hexafluoride gas inside the corresponding gas supply cavity 15, the pure sulfur hexafluoride gas enters the inside of each hollow piston rod 14 through the one-way inlet valve at the connection between each hollow piston rod 14 and the corresponding piston 16 and cannot be discharged from each gas supply cavity 15 into the circuit breaker housing 1. The pure sulfur hexafluoride gas inside each gas supply cavity 15 enters the inside of the corresponding hollow piston rod 14, and each hollow piston rod 14 is in communication with the corresponding injection channel 13, so the pure sulfur hexafluoride gas inside each hollow piston rod 14 moves into the corresponding injection channel 13 under the action of pressure, each injection channel 13 is in communication with the internal cavity of the insulation nozzle 12, so finally the pure sulfur hexafluoride gas inside each injection channel 13 is sprayed from the internal cavity of the insulation nozzle 12 to blow out the arc generated between the moving contact 7 and the static contact 4. Since the pure sulfur hexafluoride gas is used for blowing out the arc, the arc extinguishing effect is greatly improved, the arc extinguishing performance of the circuit breaker is effectively ensured, and correspondingly when the circuit breaker is operated to close, the moving contact 7 moves towards the static contact 4, the pistons 16 on each hollow piston rod 14 move inside the corresponding gas supply cavity 15 towards the static contact 4 to form a negative pressure between the inner wall of the gas supply cavity 15 away from the static contact 4 and the piston 16. The pure sulfur hexafluoride gas in the circuit breaker housing 1 enters each gas supply cavity 15 through the one-way inlet valve provided on the side wall of each gas supply cavity 15 away from the static contact 4 under the action of pressure, thereby supplementing the pure sulfur hexafluoride gas in the cavity between the inner wall of each gas supply cavity 15 away from the static contact 4 and the piston 16 to facilitate the next arc extinguishing operation. After the pure sulfur hexafluoride gas in the circuit breaker housing 1 is supplemented into each gas supply cavity 15, the air pressure in the circuit breaker housing 1 decreases, and the gas tank 17 in the operating chamber 8 supplements the pure sulfur hexafluoride gas in the gas tank 17 into the circuit breaker housing 1 through the one-way outlet valve provided at the connection between the gas tank 17 and the pipeline under the action of pressure. The arc extinguishing cavity 6 is fixedly connected with the circuit breaker housing 1 through flanges, through holes are formed on each flange to make the cavities where each gas supply cavity 15 is located in communication with the internal cavity of the circuit breaker housing 1 and the gas tank 17, so that the internal cavities of the cavities where each gas supply cavity 15 is located and the circuit breaker housing 1 and the gas tank 17 have the same air pressure, which is convenient for gas supplementing.

[0033] A plurality of piston plates 10 are connected to the arc extinguishing cavity 6 of the circuit breaker 1 in transverse sliding connection, and each piston plate 10 is in sliding sealing connection with the movable contact 7. Each adjacent piston plate 10 is connected to each other and in sliding fit. The movable contact 7 is provided with a one-way drive mechanism for driving each piston plate 10 to move towards the fixed contact 4. When the circuit breaker is in opening operation, the movable contact 7 moves away from the fixed contact 4, so that the one-way drive mechanism does not act on each piston plate 10 at this time, and each piston plate 10 does not move.

[0034] After the power system circuit fault is repaired, the circuit breaker needs to be closed to the power system circuit, at this time the operating lever 26 is rotated to the closing position, the operating lever 26 is rotated and drives the driving sleeve 27 on the inner wall of the operating chamber 8 through gear cooperation, the driving sleeve 27 drives the insulating rod 9 and the moving contact 7 to move towards the static contact 4, at this time the one-way drive mechanism provided on the moving contact 7 starts to drive each piston disc 10 to move towards the static contact 4, the one-way drive mechanism includes a plurality of slots 21 uniformly and symmetrically provided on the outer wall of the moving contact 7, each slot 21 is vertically rotatably connected with a push plate 22 with the same size as the slot 21, the bottom end of each push plate 22 is connected with the lower end face of the corresponding slot 21 through a spring, and the upper end face of each slot 21 away from the static contact 4 is fixedly connected with a limiting plate 23, during the opening operation, the moving contact 7 moves away from the static contact 4, and each push plate 22 is rotated downward and retracted into the corresponding slot 21 under the action of the corresponding piston disc 10, so that each push plate 22 cannot drive the corresponding piston disc 10 to move, that is, each piston disc 10 does not move, and when the circuit breaker is closed, each push plate 22 is rotated upward and popped out of the corresponding slot 21 under the action of the spring at the bottom end of the push plate 22 and the lower end face of the corresponding slot 21 after being separated from the corresponding piston disc 10, the upper end face of each slot 21 is fixedly connected with a limiting plate 23 to limit the rotation angle of the corresponding push plate 22 and provide support force to the corresponding push plate 22, so that the corresponding push plate 22 can push the corresponding piston disc 10 to move towards the static contact 4, when the circuit breaker is closed, the moving contact 7 moves towards the static contact 4, and each push plate 22 on the moving contact pushes the corresponding piston disc 10 to move towards the static contact 4, a plurality of piston discs 10 divide the arc extinguishing cavity 6 into a plurality of chambers, each chamber is filled with pure sulfur hexafluoride gas with the same pressure, each adjacent piston disc 10 is connected and slidably matched, and the piston disc 10 closest to the static contact 4 moves towards the static contact 4 and drives the remaining piston discs 10 to move, and the remaining piston discs 10 can also move towards the static contact 4 individually with respect to the piston disc 10 closest to the static contact 4, the piston disc 10 closest to the static contact 4 moves towards the static contact 4 and squeezes the gas between the piston disc 10 and the inside of the arc extinguishing cavity 6, and the pure sulfur hexafluoride gas between the piston disc 10 closest to the static contact 4 and the inside of the arc extinguishing cavity 6 produces some toxic gas under the action of the arc during the opening operation, on the one hand, the toxic gas affects the purity of the sulfur hexafluoride gas, and the sulfur hexafluoride gas mixture doped with toxic gas reduces the insulation performance of the sulfur hexafluoride gas and the arc extinguishing performance of the sulfur hexafluoride gas, and since the insulating nozzle 12 is always outside the static contact 4 during the separation of the moving contact 7 and the static contact 4 during the opening operation, the toxic gas exists in the nozzle position of the insulating nozzle 12 and the inside of the moving contact 7,The moving contact 7 and the insulating rod 9 are both hollow structures and connected with the exhaust tank 11 inside the operating chamber 8 through pipes, the exhaust tank 11 is provided with a one-way inlet valve at the pipe connection, the piston disc 10 closest to the static contact 4 moves towards the static contact 4 to extrude the poisonous gas and part of the sulfur hexafluoride gas in the insulating nozzle 12 spout position and the moving contact 7 into the hollow conductive rod 18 inside the moving contact 7, the hollow conductive rod 18 and the inside of the insulating rod 9 are in communication with each other, at this time, since the ends of the hollow piston rods 14 connected with each blowing channel 13 are all provided with a one-way valve, there is a certain pressure of pure sulfur hexafluoride gas in each blowing channel 13 and the corresponding hollow piston rod 14, so the sulfur hexafluoride mixed gas doped with poisonous gas will not enter the inside of each blowing channel 13 but be discharged through the inside of the hollow conductive rod 18, the sulfur hexafluoride mixed gas doped with poisonous gas reaches the inside of the insulating rod 9 through the inside of the hollow conductive rod 18 and is finally collected into the inside of the exhaust tank 11 through the one-way inlet valve, the collection work of the sulfur hexafluoride mixed gas doped with poisonous gas is completed, which effectively improves the purity of the sulfur hexafluoride gas between the piston disc 10 closest to the static contact 4 and the inside of the arc extinguishing cavity 6, thereby improving the insulation performance and arc extinguishing performance of the sulfur hexafluoride gas, ensuring the arc extinguishing performance of the circuit breaker to avoid safety accidents, and through the closing operation of the circuit breaker each time, the poisonous gas generated by the sulfur hexafluoride gas under the action of the electric arc is discharged from the inside of the arc extinguishing cavity 6 and the moving contact 7 and collected into the exhaust tank 11, effectively avoiding the case that the poisonous gas inside the circuit breaker affects the health of the maintenance personnel during the regular maintenance of the sulfur hexafluoride circuit breaker.

[0035] In order to avoid more and more toxic gas accumulation, each piston disc 10 is fixedly connected with a magnet 24 on the left and right end faces, the magnets 24 on the corresponding faces of each adjacent piston disc 10 are magnetically different, the arc extinguishing cavity 6 is provided with a basin-type insulator 25 at the position of the static contact 4, the basin-type insulator 25 is fixedly connected with a magnet 24 on the end face close to the piston disc 10, the magnet 24 of the basin-type insulator 25 and the magnet 24 on the corresponding face of the piston disc 10 are magnetically different, after the circuit breaker is operated for multiple times, the piston disc 10 closest to the static contact 4 moves a certain distance towards the static contact 4 and is then adsorbed together with the basin-type insulator 25 through the magnet 24, so that the gas between the piston disc 10 closest to the static contact 4 and the arc extinguishing cavity 6 is completely collected into the waste gas tank 11 through the internal channel of the moving contact 7, at this time, the static contact 4 is in the cavity between the piston disc 10 closest to the static contact 4 and the adjacent piston disc 10, and the cavity is filled with pure sulfur hexafluoride gas, which not only further improves the purity of the sulfur hexafluoride gas to ensure the insulation and arc extinguishing performance of the sulfur hexafluoride gas, but also completely discharges the residual toxic gas, reduces the maintenance frequency of the circuit breaker, and does not need to stop power supply, reduces the consumption of manpower and material resources, is conducive to the stable operation of the power grid, and avoids the waste of sulfur hexafluoride gas caused by frequent maintenance.

Claims

1. A power system safety protection device, comprising a circuit breaker housing (1), wherein a plurality of insulating sleeves (2) are fixedly connected to the circuit breaker housing (1), and each insulating sleeve (2) is fixedly connected to a terminal (3), characterized in that, Two corresponding terminals (3) are respectively fixedly connected to a stationary contact (4) and a moving contact slip ring (5) that pass downward through the corresponding insulating sleeve (2) and extend into the circuit breaker housing (1). An arc-extinguishing cavity (6) is fixedly connected inside the circuit breaker housing (1). The stationary contact (4) extends into the arc-extinguishing cavity (6). A moving contact (7) that cooperates with the stationary contact (4) is slidably connected inside the arc-extinguishing cavity (6). The end of the moving contact (7) away from the stationary contact (4) extends out of the arc-extinguishing cavity (6) and is slidably connected to the moving contact slip ring (5). An operating chamber (8) is fixedly connected to the circuit breaker housing (1). The end of the moving contact (7) away from the stationary contact (4) is fixedly connected to a moving contact slip ring (5) that extends into the operating chamber (8). The insulating rod (9) is installed inside the operating room (8) and a drive mechanism is provided to drive the insulating rod (9) to move laterally. The arc extinguishing chamber (6) is slidably connected to multiple piston discs (10) that are slidably sealed to the moving contact (7). Each adjacent piston disc (10) is connected to each other and slidably engaged. The moving contact (7) is provided with a one-way drive mechanism to drive each piston disc (10) to move towards the stationary contact (4). The circuit breaker housing (1) is provided with a jet arc extinguishing mechanism. The moving contact (7) and the insulating rod (9) are both hollow structures and are connected to a waste gas tank (11) located inside the operating room (8) through a pipe. The circuit breaker housing (1) and the arc extinguishing chamber (6) are both filled with inert gas at a certain pressure. The jet-blowing arc-extinguishing mechanism includes an insulating nozzle (12) located at one end of the moving contact (7) near the stationary contact (4). The moving contact (7) has symmetrically arranged jet-blowing channels (13) communicating with the internal cavity of the insulating nozzle (12). Hollow piston rods (14) extending into the arc-extinguishing cavity (6) are symmetrically fixedly connected to the outer wall of the moving contact (7). The middle portions of each hollow piston rod (14) are arranged laterally and slidably sealed to the outer wall of the arc-extinguishing cavity (6). Air supply chambers (15) are symmetrically fixedly connected to the outer wall of the arc-extinguishing cavity (6). Each hollow piston rod (14) extends... A piston (16) is fixedly connected to one end of the arc extinguishing chamber (6). Each piston (16) is slidably connected to the corresponding air supply chamber (15). Each hollow piston rod (14) is connected to the corresponding blowing channel (13). A one-way air inlet valve is provided at the connection between each hollow piston rod (14) and the corresponding piston (16). A one-way air inlet valve is provided on the side wall of each air supply chamber (15) away from the stationary contact (4). The circuit breaker housing (1) is connected to an air supply tank (17) located inside the operating room (8) through a pipeline. A one-way air outlet valve is provided at the connection between the air supply tank (17) and the pipeline.

2. The power system safety protection device according to claim 1, characterized in that, The moving contact (7) is provided with a hollow conductive rod (18). A plurality of conical conductive plates (19) are fixedly connected to one end of the hollow conductive rod (18) near the stationary contact (4). A ring clamp spring (20) is sleeved on the outer wall of the plurality of conical conductive plates (19). The end of the hollow conductive rod (18) away from the stationary contact (4) extends out of the arc extinguishing cavity (6) and is slidably connected to the moving contact slip ring (5).

3. A power system safety protection device according to claim 1, characterized in that, The unidirectional drive mechanism includes multiple slots (21) symmetrically and evenly opened on the outer wall of the moving contact (7). Each slot (21) is vertically rotatably connected to a push plate (22) with the same size as the slot (21). The bottom end of each push plate (22) is connected to the lower end face of the corresponding slot (21) by a spring. Each slot (21) has a limit plate (23) fixedly connected to the upper end face in the direction away from the stationary contact (4).

4. A power system safety protection device according to claim 1, characterized in that, Each piston disc (10) has a magnet (24) fixedly connected to its left and right end faces, and the magnets (24) on the corresponding faces of each adjacent piston disc (10) have different magnetic properties.

5. A power system safety protection device according to claim 4, characterized in that, Inside the arc-extinguishing cavity (6), a basin-type insulator (25) is provided at the position of the stationary contact (4). A magnet (24) is fixedly connected to the end face of the basin-type insulator (25) near the piston disk (10). The magnet (24) of the basin-type insulator (25) and the magnet (24) on the corresponding surface of the piston disk (10) are magnetically different.

6. A power system safety protection device according to claim 1, characterized in that, The drive mechanism includes an operating rod (26) rotatably connected to the side wall of the operating chamber (8). The operating rod (26) drives a drive sleeve (27) rotatably connected to the inner wall of the operating chamber (8) through gear engagement. The drive sleeve (27) drives the insulating rod (9) to move laterally through thread engagement with the insulating rod (9).

7. A power system safety protection device according to claim 1, characterized in that, The arc extinguishing cavity (6) is fixedly connected to the circuit breaker housing (1) through a flange. Each flange has a through hole so that the cavity where each air supply cavity (15) is located is connected to the cavity inside the circuit breaker housing (1) and the air supply tank (17).

8. A power system safety protection device according to claim 1, characterized in that, A one-way air inlet valve is provided at the connection between the waste gas tank (11) and the pipeline.

9. A power system safety protection device according to claim 1, characterized in that, The inert gas inside the circuit breaker housing (1) and the arc-extinguishing cavity (6) is sulfur hexafluoride gas.

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