Vacuum circuit breaker operating mechanism testing device

Abstract

The invention relates to the technical field of mechanical part testing, in particular to a vacuum circuit breaker operating mechanism testing device. The vacuum circuit breaker operating mechanism testing device comprises a static contact assembly, a moving contact assembly and a self-closing force simulation mechanism, the self-closing force simulation mechanism comprises a pressure cavity, the pressure cavity comprises a liquid cavity used for being filled with liquid and a gas cavity used for being filled with compressed gas, and a piston used for separating the liquid cavity from the gas cavity is arranged in the pressure cavity. The moving contact assembly is provided with a pressure-bearing part located in the liquid cavity, and the pressure in the gas cavity is transmitted to the pressure-bearing part through the piston via the liquid cavity so as to form a simulation self-closing force towards the static contact assembly on the moving contact assembly. When the moving contact assembly performs opening and closing motion, the volume variation of the pressure cavity caused by the movement of the pressure-bearing part satisfies the condition that the simulated self-closing force is within an allowable deviation range. The variable quantity of the simulated self-closing force is very small, and the test result is not easy to be greatly influenced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical component testing, and in particular to a vacuum circuit breaker operating mechanism testing device. Background Art

[0002] As the power system develops towards green and low-carbon development, environmentally friendly switchgear has become an urgent need for the construction of new power systems. Vacuum circuit breakers are mechanical switch devices that use vacuum as an insulating and arc-extinguishing medium to achieve the closing, carrying and breaking functions of current under normal or abnormal circuit conditions. Vacuum circuit breakers have many advantages such as green environmental protection, long electrical life, and excellent post-arc dielectric recovery characteristics. High-voltage vacuum circuit breakers have become an inevitable trend in the development of power switch technology.

[0003] The opening and closing actions of the vacuum circuit breaker are completed through the corresponding operating mechanism. The connection structure between the arc extinguishing chamber of the vacuum circuit breaker and the insulating pull rod of the operating mechanism can be referred to Figure 1The arc extinguishing chamber of the vacuum circuit breaker includes a vacuum chamber 121, a moving contact rod 101, and a stationary contact rod 111. The moving contact rod 101 and the stationary contact rod 111 are provided with a moving contact 102 and a stationary contact 112 at opposite ends located in the vacuum chamber 121, respectively. The end of the moving contact rod 101 located outside the vacuum chamber 121 is connected to the insulating pull rod 201 of the operating mechanism through an overtravel spring 203, a connecting cylinder 202, and a movable connecting head 204. The movable connecting head 204 is hinged on the insulating pull rod 201. At the end, the movable contact rod 101 and the movable connecting head 204 have a force transmission part guided in the connecting tube 202, and retaining walls are provided at both ends of the connecting tube 202. The retaining walls at both ends are respectively provided with through holes for avoiding the movable contact rod 101 and the movable connecting head 204. The diameter of the force transmission part of the movable contact rod 101 and the movable connecting head 204 is larger than the inner diameter of the corresponding through hole, so as to limit the force transmission part of the movable contact rod 101 and the movable connecting head 204 respectively through the retaining walls at both ends of the connecting tube 202 to prevent them from falling out. The overtravel spring 203 is located in the connecting tube 202 and between the force transmission parts of the moving contact rod 101 and the movable connecting head 204. When closing the circuit breaker, the insulating pull rod 201 drives the movable connecting head 204 to apply pressure to the overtravel spring 203, and then the overtravel spring 203 applies a thrust to the moving contact rod 101 to perform the closing action. When the moving contact 102 and the static contact 112 just come into contact, they reach the just-closed point. At this time, the insulating pull rod 201 continues to apply force, the overtravel spring 203 is compressed, and the moving contact 102 does not move until the operating mechanism closes the circuit breaker and the moving contact 102 and the static contact 112 maintain sufficient contact force. When opening the circuit breaker, the insulating pull rod 201 drives the movable connector 204 in the reverse direction, and the overtravel spring 203 is elastically released. The movable connector 204 can apply a pulling force to the moving contact rod 101 through the connecting tube 202 to perform the opening action. When the moving contact 102 and the static contact 112 are just separated, they reach the just-opening point. At this time, the insulating pull rod 201 continues to apply force until the operating mechanism opens the circuit breaker.

[0004] Since the interior of the arc extinguishing chamber of the vacuum circuit breaker is a vacuum environment, under the action of the external atmospheric pressure, the moving contact rod of the arc extinguishing chamber will always be subjected to a self-closing force in the closing direction, and the insulating pull rod of the operating mechanism and the moving contact rod are transmitted through the overtravel spring, which will generate elastic force during the opening and closing process. The arc extinguishing chamber self-closing force and overtravel spring force unique to the vacuum circuit breaker will affect its breaking characteristics. The breaking characteristic parameters of the vacuum circuit breaker include the opening and closing speed, opening and closing stroke, etc. Since the moving contact and the static contact are the plate plane collision contact structure, if the opening and closing action characteristics do not meet the arc extinguishing chamber parameter requirements, it is very easy to cause leakage and damage to the vacuum arc extinguishing chamber, reduce the electrical performance of the product, and threaten the safe and stable operation of the power grid.

[0005] The mechanical characteristics of the operating mechanism are important factors to ensure the reliable operation of the vacuum circuit breaker. The matching of the characteristics of the operating mechanism and the vacuum circuit breaker is critical. In order to ensure that the operating mechanism matches the characteristic parameters of the vacuum circuit breaker well, the operating mechanism should complete the troubleshooting and the debugging of the characteristic parameters required for the vacuum circuit breaker before leaving the factory. Since the vacuum interrupter product is a very precise core component and is expensive, directly testing the operating mechanism with the vacuum interrupter product is likely to damage the vacuum interrupter and increase costs. Therefore, a test device that can simulate a vacuum circuit breaker is currently used to test the operating mechanism.

[0006] For example, a visual simulation device for the performance test of the vacuum circuit breaker operating mechanism disclosed in the Chinese utility model patent with the authorization announcement number CN207636719U includes an operating mechanism, a self-closing spring, a moving contact, a static contact, an opening distance adjustment column and a base. The operating mechanism is installed on one side of the base, and the opening distance adjustment column is installed on the other side of the base. The opening distance adjustment column simulates different opening distance values ​​by changing the length. The static contact is installed on the support plate at the lower end of the opening distance adjustment column, and the support plate is fixed on the opening distance adjustment column. The moving contact passes through the base and is connected to the operating mechanism. The static contact and the moving contact are opposite in position. A self-closing spring is installed between the moving contact and the base. The self-closing spring here is used to simulate the vacuum switch tube. The mechanical properties of the self-closing spring are equivalent to the self-closing force generated by the external atmospheric pressure of the vacuum switch tube.

[0007] The above-mentioned test device utilizes the self-closing spring abutting against the moving contact to apply a force to the moving contact in the closing direction to simulate the self-closing force of the vacuum circuit breaker. However, the self-closing force of the vacuum circuit breaker is constant, while the above-mentioned self-closing spring will have a relatively large deformation amount with the movement of the moving contact, and then the force on the moving contact will have a relatively large change, which deviates greatly from the actual self-closing force, affecting the accuracy of the test results. Summary of the invention

[0008] The object of the present invention is to provide a vacuum circuit breaker operating mechanism test device to solve the problem that the current test device using a spring to simulate the self-closing force is prone to large deviations in test results due to large changes in the spring elastic force.

[0009] A technical solution of the vacuum circuit breaker operating mechanism testing device of the present invention is: A vacuum circuit breaker operating mechanism test device, the test device includes a static contact assembly, a moving contact assembly and a self-closing force simulation mechanism, the moving contact assembly is used for transmission connection with the vacuum circuit breaker operating mechanism, the self-closing force simulation mechanism includes a pressure chamber, the pressure chamber includes a liquid chamber for filling liquid and a gas chamber for filling compressed gas, a piston is provided in the pressure chamber to separate the liquid chamber and the gas chamber, the moving contact assembly has a pressure-bearing part located in the liquid chamber, the pressure in the gas chamber is transmitted to the pressure-bearing part through the piston via the liquid chamber to form a simulated self-closing force on the moving contact assembly toward the static contact assembly, and the volume change of the pressure chamber caused by the movement of the pressure-bearing part when the moving contact assembly performs opening and closing movements satisfies the requirement that the simulated self-closing force is within an allowable deviation range.

[0010] Beneficial effect: The present invention makes element changes on the basis of the vacuum circuit breaker operating mechanism test device in the prior art, and utilizes a self-closing force simulation mechanism with a pressure chamber to simulate the self-closing force of an actual vacuum circuit breaker product. The gas chamber of the pressure chamber is filled with compressed gas and has pressure. The pressure in the gas chamber acts on the piston, and the piston transfers the pressure to the liquid in the liquid chamber, and then transfers the pressure to the pressure-bearing part of the moving contact assembly extending into the liquid chamber through the liquid, thereby forming a force on the moving contact assembly toward the static contact assembly. When the moving contact assembly is driven by the vacuum circuit breaker operating mechanism to approach the static contact assembly for closing action or move away from the static contact assembly for opening action, the pressure chamber will always apply a force on the moving contact assembly toward the side where the static contact assembly is located, that is, the force in the closing direction. When the switch is opened and closed, the pressure-bearing part will move accordingly, thereby causing the volume of the liquid chamber to change. When the volume of the liquid chamber changes, the volume of the gas chamber will change through the movement of the piston. Since the change in the volume of the pressure chamber satisfies the requirement that the simulated self-closing force is within the allowable deviation range, that is, the change in the volume of the pressure chamber caused by the movement of the pressure-bearing part is much smaller than the volume of the gas chamber, the change in the volume of the gas chamber is very small, and the impact on the pressure in the gas chamber is very small. The pressure fluctuation is within the allowable deviation range, and the pressure can be considered to be an approximate constant. The force formed by the pressure on the moving contact assembly can be used as a simulated self-closing force to equal the actual self-closing force. This test device that uses gas pressure to simulate the self-closing force can make the change in the simulated self-closing force very small, which is not easy to have a great impact on the test results, and is beneficial to reducing the deviation of the test results.

[0011] Furthermore, the testing device includes a pressure container and a pressure accumulator, the pressure accumulator is connected to the pressure container through a connecting pipe, the piston is arranged in the inner cavity of the pressure accumulator, the space of the inner cavity of the pressure accumulator located on one side of the piston constitutes the gas chamber, the space of the pressure accumulator located on the other side of the piston and the space in the connecting pipe and the space in the pressure container are used to form the liquid chamber, and the pressure-bearing part extends into the pressure container.

[0012] Furthermore, the moving contact assembly includes a moving contact piece, an adapter and at least two connecting rods, one end of each connecting rod is connected to the adapter and the other end is connected to the moving contact piece, the adapter is used to transmit and connect the vacuum circuit breaker operating mechanism, the moving contact piece is used to cooperate with the static contact assembly to perform opening and closing, and the pressure-bearing part is arranged on the moving contact piece and is located at the center of the area enclosed by each connecting rod.

[0013] Furthermore, the testing device comprises a base, the movable contact assembly is arranged on the base for guiding movement, and the base is provided with a guide hole for the connecting rod to pass through.

[0014] Furthermore, the moving contact assembly includes a moving contact piece and a pressure-bearing rod. The moving contact piece is used to cooperate with the static contact assembly to perform opening and closing. One end of the pressure-bearing rod is fixed on the moving contact piece. The pressure chamber includes a sliding sealing hole for the other end of the pressure-bearing rod to extend into. The pressure-bearing rod constitutes the pressure-bearing part.

[0015] Furthermore, the static contact assembly comprises a static end support seat, a static contact piece and an overtravel spring, the static contact piece is movably arranged on the static end support seat, and the overtravel spring abuts between the static end support seat and the static contact piece.

[0016] Furthermore, the static contact component includes a contact end and an adjusting rod section, the contact end is used to cooperate with the moving contact assembly to perform opening and closing, and the static end support seat is provided with a mounting hole for the adjusting rod section to pass through, and the end of the adjusting rod section passing through the mounting hole is threadedly connected with an adjusting nut to change the compression amount of the overtravel spring by screwing the adjusting nut.

[0017] Furthermore, the testing device also includes a distance adjustment structure for adjusting the distance between the stationary contact assembly and the moving contact assembly.

[0018] Further, the moving contact assembly includes a counterweight having a set weight.

[0019] Another technical solution of the vacuum circuit breaker operating mechanism testing device of the present invention is: A vacuum circuit breaker operating mechanism test device, the test device includes a static contact assembly, a moving contact assembly and a self-closing force simulation mechanism, the moving contact assembly is used for transmission connection with the vacuum circuit breaker operating mechanism, the self-closing force simulation mechanism includes a pressure chamber, the pressure chamber is a gas chamber for filling compressed gas, the moving contact assembly has a pressure-bearing part located in the gas chamber, the pressure in the gas chamber acts on the pressure-bearing part to form a simulated self-closing force on the moving contact assembly toward the static contact assembly, and the volume change of the gas chamber caused by the movement of the pressure-bearing part when the moving contact assembly performs opening and closing movements satisfies the requirement that the simulated self-closing force is within an allowable deviation range.

[0020] Beneficial effect: The present invention makes element changes on the basis of the vacuum circuit breaker operating mechanism test device in the prior art, and utilizes a self-closing force simulation mechanism with a pressure chamber to simulate the self-closing force of an actual vacuum circuit breaker product. The pressure chamber is filled with compressed gas to form a gas chamber with pressure. The pressure in the gas chamber acts on the pressure-bearing part of the moving contact assembly extending into the gas chamber, thereby forming a force on the moving contact assembly toward the static contact assembly. When the moving contact assembly is driven by the vacuum circuit breaker operating mechanism to approach the static contact assembly for closing action or to move away from the static contact assembly for opening action, the pressure chamber will always apply a force on the moving contact assembly toward the side where the static contact assembly is located, that is, a force in the closing direction. At the same time, when the moving contact assembly is opening and closing, the pressure chamber will always apply a force on the moving contact assembly toward the side where the static contact assembly is located, that is, a force in the closing direction. During movement, the pressure-bearing part will also move, thereby causing the volume of the gas chamber to change. Since the change in the volume of the pressure chamber satisfies the requirement that the simulated self-closing force is within the allowable deviation range, that is, the change in the volume of the gas chamber caused by the movement of the pressure-bearing part is much smaller than the entire volume of the gas chamber, the change in the volume of the gas chamber is very small, and the impact on the pressure in the gas chamber is very small. The pressure fluctuation is within the allowable deviation range, and the pressure can be considered to be an approximate constant. The force exerted on the moving contact assembly by the pressure can be used as a simulated self-closing force to equal the actual self-closing force. This test device that uses gas pressure to simulate the self-closing force can make the change in the simulated self-closing force very small, which is not easy to have a significant impact on the test results and is beneficial to reducing the deviation of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the connection structure between the arc extinguishing chamber of the vacuum circuit breaker and the insulating pull rod of the operating mechanism; Figure 2 It is a structural schematic diagram of a vacuum circuit breaker operating mechanism testing device according to an embodiment of the present invention.

[0022] In the figure: 101, moving contact rod; 111, moving contact; 102, stationary contact rod; 112, stationary contact; 121, vacuum chamber; 201, insulating pull rod; 202, connecting tube; 203, overtravel spring; 204, movable connecting head; 1. Output shaft; 2. Output swing arm; 3. Transmission connecting rod; 4. Fixed shaft; 5. Transmission crank arm; 6. Transmission pull rod; 7. Adapter; 8. Guide ring; 9. Guide support; 10. Connecting pipe; 11. Piston; 12. Accumulator; 13. Static end mounting seat; 14. Overtravel spring; 15. Static end guide seat; 16. Adjusting nut; 17. Static contact piece; 18. Counterweight piece; 19. Moving contact piece; 20. Pressure rod; 21. Connecting rod; 22. Pressure container; 23. Fixed support; 24. Operating mechanism; 25. Fracture detection system; 26. Support base. DETAILED DESCRIPTION

[0023] The vacuum circuit breaker operating mechanism testing device of the present invention utilizes gas pressure to exert a force in a constant direction on the moving contact piece to simulate the formation of a self-closing force, which can make the variation of the simulated self-closing force very small, thereby facilitating the reduction of the deviation of the test result.

[0024] The technical solution of the present invention is specifically described below in conjunction with embodiments.

[0025] Embodiment of the vacuum circuit breaker operating mechanism testing device of the present invention: like Figure 2 As shown, the vacuum circuit breaker operating mechanism test device includes a base, a moving contact assembly, a static contact assembly, a moving end transmission mechanism, a self-closing force simulation mechanism and a fracture detection system 25. The base includes a guide support 9, a fixed support 23 and a support base 26, and the moving contact assembly includes an adapter 7, a connecting rod 21 and a moving contact member 19, and a pressure-bearing rod 20. The moving contact assembly is movably arranged on the base. The static contact assembly includes a static contact member 17, an overtravel spring 14, a static end guide seat 15, and a static end mounting seat 13. The dynamic end transmission mechanism includes an output swing arm 2, a transmission connecting rod 3, a fixed shaft 4, a transmission crank arm 5 and a transmission pull rod 6. The vacuum circuit breaker operating mechanism is an operating mechanism 24, and the operating mechanism 24 is connected to the moving contact assembly through the dynamic end transmission mechanism, so that the moving contact assembly is connected to the vacuum circuit breaker operating mechanism in a transmission manner, so that when the operating mechanism 24 is tested, the operating mechanism 24 drives the moving contact assembly to move, and then cooperates with the static contact assembly to perform the opening and closing action. The testing device is used to perform a characteristic test on the operating mechanism 24 before it leaves the factory, so as to achieve characteristic matching with the vacuum circuit breaker product.

[0026] The self-closing force simulation mechanism of the test device is used to simulate the self-closing force of the vacuum circuit breaker, so as to more accurately test the mechanical characteristics of the operating mechanism 24. The self-closing force simulation mechanism includes a pressure chamber, which includes a liquid chamber for filling liquid and a gas chamber for filling compressed gas. The pressure chamber is provided with a piston 11 separating the liquid chamber and the gas chamber. The moving contact assembly has a pressure-bearing portion extending into the liquid chamber, which is provided on the pressure-bearing rod 20 and located in the pressure chamber. The pressure in the gas chamber is transmitted to the pressure-bearing portion through the piston 11 through the liquid chamber to form a simulated self-closing force on the moving contact assembly toward the static contact assembly. When the moving contact assembly performs the opening and closing movement, the change in the volume of the pressure chamber caused by the movement of the pressure-bearing portion satisfies the requirement that the simulated self-closing force is within the allowable deviation range.

[0027] The gas chamber of the pressure chamber is filled with compressed gas and has pressure. The pressure in the gas chamber acts on the piston 11, and the piston 11 transfers the pressure to the liquid in the liquid chamber, and then transfers the pressure to the pressure-bearing part of the moving contact assembly extending into the liquid chamber through the liquid, forming a force on the moving contact assembly toward the static contact assembly. When the moving contact assembly is driven by the operating mechanism 24 to approach the static contact assembly to perform a closing action or move away from the static contact assembly to perform an opening action, the pressure chamber will always apply a force to the moving contact assembly toward the side where the static contact assembly is located, that is, a force in the closing direction. At the same time, when the moving contact assembly performs an opening and closing movement, the pressure-bearing part will also move accordingly, thereby causing a volume change in the liquid chamber. When the volume of the liquid chamber changes, the piston 11 will move under the action of the pressure in the gas chamber, and the piston The movement of 11 causes the volume of the gas chamber to change, and the change in the volume of the pressure chamber satisfies the requirement that the simulated self-closing force is within the allowable deviation range, that is, the change in the volume of the pressure chamber caused by the movement of the pressure-bearing part is much smaller than the volume of the gas chamber. The change in the volume of the gas chamber is very small, and the influence on the pressure in the gas chamber is very small. The pressure fluctuation is within the allowable deviation range, and the pressure can be considered to be an approximate constant. The force exerted on the moving contact assembly by the pressure can be used as a simulated self-closing force to be equivalent to the actual self-closing force. The self-closing force simulation mechanism with a pressure chamber is used to simulate the self-closing force of an actual vacuum circuit breaker product. This test device that uses gas pressure to simulate the self-closing force can make the change in the simulated self-closing force very small, which is not easy to cause a great influence on the test result, and is beneficial to reducing the deviation of the test result.

[0028] In this embodiment, the pressure chamber includes a liquid chamber and a gas chamber. The pressure in the gas chamber is transmitted to the liquid in the liquid chamber through the piston 11, and then the pressure is applied to the pressure-bearing part of the moving contact assembly through the liquid. The liquid has an incompressible characteristic, which is beneficial to maintaining pressure stability and safety when the pressure-bearing part moves with the moving contact assembly. In other implementations, the pressure chamber of the self-closing force simulation mechanism can also be a gas chamber for filling compressed gas. The pressure-bearing part of the moving contact assembly extends into the gas chamber. The pressure in the gas chamber acts on the pressure-bearing part to form a simulated self-closing force on the moving contact assembly toward the static contact assembly. When the moving contact assembly performs opening and closing movements, the volume change of the gas chamber caused by the movement of the pressure-bearing part satisfies the requirement that the simulated self-closing force is within the allowable deviation range.

[0029] The self-closing force simulation mechanism of the test device includes a pressure container 22 and a pressure accumulator 12, the pressure accumulator 12 is connected to the pressure container 22 through a connecting pipe 10, the piston 11 is arranged in the inner cavity of the pressure accumulator 12, the space of the inner cavity of the pressure accumulator 12 located on one side of the piston 11 constitutes a gas cavity, the space of the pressure accumulator 12 located on the other side of the piston 11 and the space in the connecting pipe 10 and the space in the pressure container 22 are used to form a liquid cavity, and the pressure-bearing part of the moving contact assembly extends into the pressure container 22. The pressure accumulator 12 is used to facilitate the setting of a gas cavity with a larger volume, and the pressure container 22 is used to fill the liquid without setting a large volume, which is convenient for the connection between the self-closing force mechanism and the moving contact assembly. In other embodiments, if the installation space allows, the pressure cavity of the self-closing force simulation mechanism can also be formed by the inner cavity of a single pressure container, and the volume of the pressure container is set large enough to meet the requirements. Accordingly, the piston is arranged in the pressure container to separate the inner cavity of the pressure container into a liquid cavity and a gas cavity.

[0030] There are more than two connecting rods 21 of the moving contact assembly, and each connecting rod 21 is evenly distributed along the circumferential direction. In this embodiment, two connecting rods 21 are arranged at intervals on the left and right. In other embodiments, three connecting rods can also be set. The connecting rods 21 are arranged vertically up and down, and the upper end of each connecting rod 21 is connected to the same adapter 7, and the lower end is connected to the same moving contact piece 19. The adapter 7 is connected to the operating mechanism 24 through the moving end transmission mechanism. The moving contact piece 19 is used to cooperate with the static contact piece 17 of the static contact assembly to open and close the switch. The pressure rod 20 is arranged on the moving contact piece 19 and is located at the center of the area surrounded by each connecting rod 21. The moving contact piece 19 can be a long strip plate. The two connecting rods 21 are fixedly connected to the two ends of the moving contact piece 19 in the length direction, and the pressure rod 20 is fixed in the middle position of the moving contact piece 19 in the length direction. The moving contact piece 19 is subjected to uniform force, and the area between the connecting rods 21 can be used to set a self-closing force simulation mechanism for easy layout. In other embodiments, if space permits, the pressure-bearing rod may also be fixed on the adapter, so that the self-closing force simulation mechanism can apply a simulated self-closing force in the closing direction to the moving contact assembly.

[0031] The base is a frame with a certain height. The guide support 9, the fixed support 23 and the support base 26 are parts of the base with different heights. The guide support 9 is located above the fixed support 23, and the fixed support 23 is located above the support base 26. The moving contact assembly is guided and movably mounted on the guide support 9 and the fixed support 23, and the static contact assembly is mounted on the support base 26. The base also includes a support for mounting the operating mechanism 24 and a support for mounting the fracture detection system 25. The pressure container 22 of the self-closing force simulation mechanism is fixed on the fixed support 23, and the pressure accumulator 12 is fixedly supported on supports at other corresponding positions of the base.

[0032] A guide ring 8 is provided at the center of the guide support 9 of the base. The guide ring 8 has an inner hole that passes through from top to bottom. The adapter 7 includes a vertical part and a horizontal part. The vertical part is guided and penetrated in the guide ring 8. The lower end of the vertical part is connected to the horizontal part and the upper end is hinged to the transmission pull rod 6. The transmission pull rod 6 is hinged to one end of the transmission crank arm 5. The transmission crank arm 5 is rotatably mounted on the fixed shaft 4. The fixed shaft 4 is fixed on the base. The other end of the transmission crank arm 5 is hinged to one end of the transmission connecting rod 3. The other end of the transmission connecting rod 3 is connected to the output swing arm 2. The output swing arm 2 is fixedly mounted on the output shaft 1 of the operating mechanism 24. The horizontal part of the adapter 7 is located at the lower side of the guide support 9 and is fixedly connected to the upper end of each connecting rod 21. The fixed support 23 is provided with a guide sleeve for each connecting rod 21 to pass through. The inner hole of the guide sleeve constitutes a guide hole for the connecting rod 21 to pass through. The connecting rod 21 is guided by the fixed support 23 to make the moving contact assembly move straight up and down, which is conducive to maintaining the moving trajectory. In other implementations, the fixed support may not guide the connecting rod, and the linear movement of the moving contact assembly can be achieved by only guiding the adapter on the guide support.

[0033] The lower end of the pressure rod 20 is fixed on the moving contact 19 and fixed on the upper side of the moving contact 19. The lower side of the central part of the moving contact 19 is used to contact the static contact 17. The pressure container 22 is arranged above the moving contact 19 and is located between the two connecting rods 21 and on the lower side of the fixed support 23. The pressure container 22 is fixed on the fixed support 23. A sliding sealing hole is provided at the lower part of the pressure container 22 for the upper end of the pressure rod 20 to extend into. A sealing ring is provided between the pressure rod 20 and the hole wall of the sliding sealing hole. While keeping the liquid chamber sealed, the pressure rod 20 can move up and down. The pressure in the liquid chamber acts on the upper end of the pressure rod 20. The pressure-bearing part is formed by the pressure rod 20 arranged on the moving contact 19. The pressure rod 20 with a smaller diameter can be used to extend into the pressure chamber, reducing the influence of the movement of the pressure rod 20 on the volume change of the pressure chamber. In other embodiments, a pressure-bearing cylinder can also be provided on the moving contact member, a guide column can be provided at the bottom of the pressure container, a through hole can be provided in the guide column, the pressure-bearing cylinder is sealingly sleeved on the guide column to enclose a pressure chamber, and the bottom of the pressure-bearing cylinder constitutes a pressure-bearing part, so that the pressure-bearing part is located in the pressure chamber and can withstand the pressure in the pressure chamber.

[0034] The pressure container 22 is a tank body, which includes a tank bottom, a tank wall and a tank cover. The tank bottom is provided with an extended section extending downward, and the outer diameter of the extended section is smaller than the outer diameter of the tank wall. A sliding sealing hole for the pressure-bearing rod 20 to extend into is arranged in the extended section. After the switch is closed in place, the upper end of the pressure-bearing rod 20 does not protrude from the sliding sealing hole, and the pressure-bearing rod 20 does not extend into the main cavity surrounded by the tank wall of the tank body. The pressure accumulator 12 is a vertically arranged column, and the piston 11 is slidably sealed in the inner cavity of the pressure accumulator 12. The space located below the piston 11 in the inner cavity of the pressure accumulator 12 constitutes a gas cavity, and the space located above the piston 11 is used to form a part of the liquid cavity. The pressure accumulator 12 is provided with a gas charging interface at the bottom and a top cover at the top. The two ends of the connecting pipe 10 are respectively connected to the top cover of the pressure accumulator 12 and the tank cover of the pressure container 22. The fixed support 23 is provided with a circumvention hole for circumventing the connecting pipe 10. The top cover of the pressure accumulator 12 and the tank cover of the pressure container 22 are respectively provided with channels corresponding to the connecting pipe 10, so that the space located above the piston 11 of the pressure accumulator 12 is connected to the inner space of the pressure container 22 through the connecting pipe 10, thereby forming a liquid cavity. The top cover of the pressure accumulator 12 and the tank cover of the pressure container 22 are provided with a liquid filling interface for filling liquid and an exhaust valve for exhausting excess air. The liquid cavity and the gas cavity are isolated from each other and are both sealed cavities. The pressure accumulator is equipped with a pressure gauge to detect the pressure in the pressure cavity. The set pressure is achieved by filling the gas chamber with high-pressure gas through the gas charging interface at the bottom of the pressure accumulator.

[0035] The static contact member 17 of the static contact assembly is located below the moving contact member 19. The radial dimension of the static contact member 17 is relatively small. The static contact member 17 is movably arranged on the static end guide seat 15. The static end guide seat 15 is fixedly connected to the static end mounting seat 13. The static end mounting seat 13 is mounted on the support base 26. An insulating gasket is arranged between the static contact assembly and the support base. The static end guide seat 15 and the static end mounting seat 13 together form a static end support seat. The static contact member 17 is movably arranged on the static end support seat. The overtravel spring 14 abuts between the static end support seat and the static contact member 17. The overtravel spring 14 is arranged at the static end. While equivalently simulating the force of the overtravel spring 14, it is convenient to simplify the installation structure of the overtravel spring 14. In other embodiments, the overtravel spring can also be arranged in the moving contact assembly, for example, between the adapter and the transmission pull rod, so as to simulate the force of the overtravel spring.

[0036] The static contact member 17 includes a contact end and an adjusting rod section. The contact end is used to cooperate with the moving contact member 19 to open and close the switch. The diameter of the contact end is larger than the diameter of the adjusting rod section, and the contact end is connected to the upper end of the adjusting rod section. A avoidance hole for avoiding the static end guide seat 15 is provided at the center of the static end mounting seat 13. The static end guide seat 15 has a portion that is penetrated in the avoidance hole. The static end guide seat 15 is provided with a central hole that passes through from top to bottom. The central hole includes an upper hole section with a smaller aperture and a lower hole section with a larger aperture. The upper hole section constitutes a mounting hole provided on the static end guide seat 15 for guiding and penetrating the adjusting rod section of the static contact member 17. The end of the adjusting rod section of the static contact member 17 that passes through the mounting hole is threadedly connected with an adjusting nut 16 to change the compression amount of the overtravel spring 14 by screwing the adjusting nut 16. The adjusting nut 16 is located in the lower hole section of the static end guide seat 15. The step at the junction of the lower hole section and the upper hole section of the static end guide seat 15 can stop the adjusting nut 16. The overtravel spring 14 is sleeved on the static end guide seat 15, the upper end of the overtravel spring 14 abuts against the lower side of the contact end of the static contact member 17, and the lower end abuts against the upper side of the static end mounting seat 13. By screwing the adjustment nut 16, the static contact member 17 can be driven to move and the compression amount of the overtravel spring 14 can be adjusted. The center hole of the support base 116 can avoid the tool for screwing the adjustment nut. In other embodiments, the static contact member can also be fixed as needed.

[0037] The test device also includes a distance adjustment structure for adjusting the distance between the static contact assembly and the moving contact assembly. The distance adjustment structure can be a gasket arranged between the static end mounting seat 13 and the support base 26. The installation height of the static contact assembly can be adjusted by adjusting the number or thickness of the gaskets to adapt to the simulation of vacuum circuit breakers with different distances. In other embodiments, the distance adjustment structure may not be provided as required.

[0038] The lower end of each connecting rod 21 of the moving contact assembly is provided with a counterweight 18, and the counterweight 18 has a set weight to simulate the load formed by the gravity of the vacuum circuit breaker, so that the weight of the entire moving contact assembly meets the load requirement. In other embodiments, the counterweight can also be set at the upper end of the connecting rod, or the counterweight can be eliminated when the influence of the mass of the vacuum circuit breaker on the operating mechanism does not need to be considered.

[0039] The fracture detection system 25 is connected to the operating mechanism 24 and the static contact assembly through a wire. The various components of the static contact assembly, the various components of the moving contact assembly, and the various components of the moving end transmission mechanism are all metal parts and can conduct electricity. When the fracture detection system 25 is powered on and the moving contact member 19 and the static contact member 17 are closed, the fracture detection system 25, the operating mechanism 24, the moving end transmission mechanism, the moving contact assembly, and the static contact assembly form a loop, which can be used to detect the opening and closing signals. The test device is equipped with a sensor for detecting the moving contact assembly moving speed. The sensor is connected to the fracture detection system 25 for communication, and can test the speed at which the operating mechanism 24 drives the moving contact assembly to move.

[0040] The closing process of the test device: the output shaft 1 of the operating mechanism 24 rotates clockwise, and the transmission connecting rod 3 is pulled by the output swing arm 2 to drive the transmission crank arm 5 to rotate clockwise around the fixed axis 4, pushing the transmission pull rod 6. It is estimated that the transmission pull rod 6 drives the adapter 7, the connecting rod 21, and the moving contact piece 19 to move in the closing direction (downward). When the moving contact piece 19 moves to contact the static contact piece 17, the break is connected, and the characteristic test simulates the circuit breaker just closing point position. The operating mechanism 24 drives the moving contact piece 19 to continue to move in the closing direction, compressing the overtravel spring 14 at the static end (simulating the overtravel spring force of the circuit breaker) until the operating mechanism 24 drives the moving contact piece 19 to close in place and stop. During this process, the compressed gas in the accumulator 12 pushes the liquid in the accumulator 12, which is connected with the liquid in the pressure container 22 through the connecting pipe 10. The pressurized liquid pushes the pressure rod 20 to provide an approximately constant force in the closing direction. By controlling the volume ratio of the pressure rod 20 and the compressed gas in the accumulator 12, it can be considered that the force provided by the pressure rod 20 in the closing direction is a constant force. The volume change of the compressed gas in the accumulator 12 in this embodiment is less than 5%.

[0041] The opening process of the test device: the output shaft 1 of the operating mechanism 24 rotates counterclockwise, and drives the moving contact 19 to move in the opening direction (upward) through the output swing arm 2, the transmission connecting rod 3, the transmission crank arm 5, the transmission pull rod 6, the adapter 7, and the connecting rod 21. When the moving contact 19 moves to separate the static contact 17, the break is disconnected, and the characteristic test simulates the position of the circuit breaker just opening. The spring force value of the overtravel spring 14 disappears, and the operating mechanism 24 drives the moving contact 19 to continue to move in the opening direction until the operating mechanism 24 drives the moving contact 19 to stop in the opening position. In this process, the pressure accumulator 12 provides an approximately constant force to the pressure rod 20 in the closing direction (simulating the self-closing force of the circuit breaker).

[0042] By adjusting the mass of the counterweight 18, the mass of the vacuum circuit breaker can be simulated equivalently; by adjusting the compressed gas pressure of the pressure accumulator 12, the self-closing force of the vacuum circuit breaker can be simulated equivalently; by screwing the adjustment nut 16 or replacing the overtravel spring 14, the force of the overtravel spring of the vacuum circuit breaker can be simulated equivalently; by adjusting the distance between the static contact assembly and the support base 26, the opening distance of the vacuum circuit breaker can be simulated equivalently. Through the above adjustments, the test device can be matched with the product characteristics of vacuum circuit breakers of different voltage levels to meet the test needs of the operating mechanisms adapted to different vacuum circuit breakers.

[0043] This test device simulates a vacuum circuit breaker to test the operating mechanism, and can replace vacuum circuit breaker products to carry out mechanical characteristic tests and reliability test verification of the adapted operating mechanism. Based on the principle that gas is compressible but liquid is incompressible, and using the accumulator structure that maintains a constant pressure with compressed gas, the output force value within the opening and closing stroke range of the simulated circuit breaker is basically kept constant, which is equivalent to the vacuum self-closing force of the vacuum circuit breaker. The equivalent mass method is used to achieve the equivalence of the moving mass. An overtravel spring is used in conjunction with a mechanical transmission mechanism to simulate the overtravel spring structure of a vacuum circuit breaker. Through the above load structure design and theoretical calculation, it is ensured that the load characteristics of the test device are basically consistent with those of the vacuum circuit breaker product, and it has the function of completing the factory test and characteristic debugging of the vacuum circuit breaker operating mechanism on the test device.

[0044] The test device replaces the insulating parts in the vacuum circuit breaker with metal parts, reducing the size of the test device. At the same time, through the equivalent load method, there is no need for a vacuum chamber, and there is no need to consider the problem of vacuum arc chamber leakage, which improves the strength of transmission components, increases the number of operations, and prolongs the service life, thereby improving the reliability of the test device.

[0045] The test device is universal and can simulate the load characteristics of vacuum circuit breakers of all voltage levels by adjusting the equivalent mass of moving parts, accumulator pressure, overtravel spring force and other parameters. It is easy to operate, easy to install and debug, highly versatile, cost-effective, reliable to use, and has a wide range of applications, providing technical support for the research, development, promotion and application of vacuum circuit breaker operating mechanisms. It can complete fault troubleshooting and debugging of characteristic parameters required for vacuum circuit breakers before the operating mechanism leaves the factory, and then assemble, debug and test the operating mechanism and vacuum circuit breaker body, which can greatly reduce the risk of damage to the vacuum circuit breaker body, improve product quality and work efficiency, and reduce production costs, which is of great significance to the development of the vacuum circuit breaker industry.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum circuit breaker operating mechanism testing device, characterized in that: The test device includes a static contact assembly, a moving contact assembly and a self-closing force simulation mechanism. The moving contact assembly is used for transmission connection with the vacuum circuit breaker operating mechanism. The self-closing force simulation mechanism includes a pressure chamber. The pressure chamber includes a liquid chamber for filling liquid and a gas chamber for filling compressed gas. A piston is provided in the pressure chamber to separate the liquid chamber and the gas chamber. The moving contact assembly has a pressure-bearing part located in the liquid chamber. The pressure in the gas chamber is transmitted to the pressure-bearing part through the piston via the liquid chamber to form a simulated self-closing force on the moving contact assembly toward the static contact assembly. When the moving contact assembly performs opening and closing movements, the volume change of the pressure chamber caused by the movement of the pressure-bearing part satisfies the requirement that the simulated self-closing force is within an allowable deviation range.

2. The vacuum circuit breaker operating mechanism testing device according to claim 1, characterized in that: The testing device includes a pressure container and a pressure accumulator, the pressure accumulator is connected to the pressure container through a connecting pipe, the piston is arranged in the inner cavity of the pressure accumulator, the space of the inner cavity of the pressure accumulator located on one side of the piston constitutes the gas cavity, the space of the pressure accumulator located on the other side of the piston and the space in the connecting pipe and the space in the pressure container are used to form the liquid cavity, and the pressure-bearing part extends into the pressure container.

3. The vacuum circuit breaker operating mechanism testing device according to claim 1 or 2, characterized in that: The moving contact assembly includes a moving contact piece, an adapter and at least two connecting rods. One end of each connecting rod is connected to the adapter and the other end is connected to the moving contact piece. The adapter is used to transmit and connect the vacuum circuit breaker operating mechanism. The moving contact piece is used to cooperate with the static contact assembly to open and close the switch. The pressure-bearing part is arranged on the moving contact piece and is located at the center of the area enclosed by each connecting rod.

4. The vacuum circuit breaker operating mechanism testing device according to claim 3, characterized in that: The testing device comprises a base, a moving contact assembly is arranged on the base for guiding movement, and a guide hole for guiding a connecting rod to pass through is arranged on the base.

5. The vacuum circuit breaker operating mechanism testing device according to claim 1 or 2, characterized in that: The moving contact assembly includes a moving contact piece and a pressure-bearing rod. The moving contact piece is used to cooperate with the static contact assembly to open and close the switch. One end of the pressure-bearing rod is fixed on the moving contact piece. The pressure chamber includes a sliding sealing hole for the other end of the pressure-bearing rod to extend into. The pressure-bearing rod constitutes the pressure-bearing part.

6. The vacuum circuit breaker operating mechanism testing device according to claim 1 or 2, characterized in that: The static contact assembly comprises a static end support seat, a static contact piece and an overtravel spring. The static contact piece is movably arranged on the static end support seat, and the overtravel spring abuts between the static end support seat and the static contact piece.

7. The vacuum circuit breaker operating mechanism testing device according to claim 6, characterized in that: The static contact component includes a contact end and an adjusting rod section. The contact end is used to cooperate with the moving contact assembly to perform opening and closing. A mounting hole for the adjusting rod section to pass through is provided on the static end support seat. The end of the adjusting rod section passing through the mounting hole is threadedly connected with an adjusting nut to change the compression amount of the overtravel spring by screwing the adjusting nut.

8. The vacuum circuit breaker operating mechanism testing device according to claim 1 or 2, characterized in that: The testing device also includes a distance adjustment structure for adjusting the distance between the stationary contact assembly and the moving contact assembly.

9. The vacuum circuit breaker operating mechanism testing device according to claim 1 or 2, characterized in that: The moving contact assembly includes a counterweight having a set weight.

10. A vacuum circuit breaker operating mechanism testing device, characterized in that: The test device includes a static contact assembly, a moving contact assembly and a self-closing force simulation mechanism. The moving contact assembly is used for transmission connection with the vacuum circuit breaker operating mechanism. The self-closing force simulation mechanism includes a pressure chamber, which is a gas chamber for filling compressed gas. The moving contact assembly has a pressure-bearing part located in the gas chamber. The pressure in the gas chamber acts on the pressure-bearing part to form a simulated self-closing force on the moving contact assembly toward the static contact assembly. When the moving contact assembly performs opening and closing movements, the volume change of the gas chamber caused by the movement of the pressure-bearing part satisfies the requirement that the simulated self-closing force is within an allowable deviation range.

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