A simulated load test tool for vacuum circuit breaker operating mechanism

Abstract

The present invention relates to the field of testing of operating mechanisms, and in particular to a simulated load test fixture for operating mechanisms of vacuum circuit breakers. The simulated load test fixture for operating mechanisms of vacuum circuit breakers of the present invention comprises a shell, an end cover is provided at one end of the shell, a center hole is opened on the end cover, an overtravel cylinder with an opening at one end in the shell, an overtravel spring is provided in the overtravel cylinder, a slider is provided at the end of the overtravel spring close to the end cover and cooperates with the stopper at the opening of the overtravel cylinder, a connecting rod for transmission connection with the operating mechanism that cooperates with the center hole of the end cover is fixedly connected to the slider, a moving end is provided at the end of the overtravel cylinder away from the end cover, a travel spring for simulating the closing self-closing force of the vacuum circuit breaker is provided in the shell, a static end is provided at the other end of the shell, and the overtravel spring and the travel spring are in a compressed state when assembled. The simulated load test fixture for operating mechanisms of vacuum circuit breakers of the present invention can simulate the real load state of the arc extinguishing chamber of the vacuum circuit breaker and complete the test of the operating mechanism of the vacuum circuit breaker.

Description

Technical Field

[0001] The invention relates to the field of operating mechanism testing, and in particular to a simulated load test tool for an operating mechanism of a vacuum circuit breaker. Background Art

[0002] The opening and closing of the circuit breaker is mainly achieved through the operating mechanism. To ensure that the circuit breaker can achieve reliable opening and closing operations, the operating mechanism needs to be load tested before leaving the factory. Due to the actual use of the operating mechanism, the operating mechanism is prone to damage without a certain load. Therefore, the operating mechanism cannot be tested without load alone. At present, when testing the operating mechanism, it is usually necessary to install the operating mechanism into the circuit breaker and cooperate with the circuit breaker to test the whole machine, but the testing cost of this test method is relatively high.

[0003] A Chinese invention patent with authorization announcement number CN106291345B and authorization announcement date January 7, 2020 discloses a simulated load test device for a circuit breaker operating mechanism, the simulated load test device comprising a buffer cylinder and a piston arranged in the buffer cylinder, the buffer cylinder is filled with gas, the piston is provided with an operating rod transmission-connected to the operating mechanism, and the piston is also provided with a damping channel connecting the rodless chamber and the rod chamber. When the piston moves toward the rod chamber, the gas in the rod chamber is compressed, and the gas in the rod chamber enters the rodless chamber through the damping channel to generate a buffering force on the piston; when the piston moves toward the rodless chamber, the gas in the rodless chamber is compressed and enters the rod chamber through the damping channel and generates a force on the piston; the simulated load experimental device uses gas as a load to perform a simulated test on the operating mechanism, which can more realistically simulate the actual working conditions of the operating mechanism, and at the same time, does not need to be combined with a circuit breaker for whole-machine testing, and the test cost is low.

[0004] The simulated load test device of the operating mechanism mentioned above can test the operating mechanism of the circuit breaker whose insulating medium is SF6. Since the real load state of the vacuum circuit breaker is different from that of the circuit breaker whose insulating medium is SF6, the vacuum circuit breaker of the prior art mainly adopts a docking contact structure. In the vacuum arc chamber, due to the effect of air pressure, a force that closes the moving contact and the static contact will be generated, that is, the self-closing force. The self-closing force of the vacuum arc chamber and the elastic force of the closing holding spring provide the moving contact with contact pressure to achieve reliable closing. The circuit breaker whose insulating medium is SF6 mainly adopts a plug-in contact structure. During the closing process, there is no air pressure force on the moving contact. The simulated load test device mentioned above cannot simulate the air pressure force in the vacuum circuit breaker, so it is not suitable for testing the operating mechanism of the vacuum circuit breaker. When testing the operating mechanism of the vacuum circuit breaker, it is necessary to simulate the air pressure force of the vacuum circuit breaker and the elastic force of the closing holding spring to ensure the accuracy of the simulated load test. Therefore, a test device for the operating mechanism that can simulate the real load state of the vacuum circuit breaker is needed. Summary of the invention

[0005] The object of the present invention is to provide a simulated load test fixture for an operating mechanism of a vacuum circuit breaker, so as to solve the problem that the existing simulated load test device for the operating mechanism cannot meet the test requirements of the operating mechanism of the vacuum circuit breaker.

[0006] The simulated load test fixture of the vacuum circuit breaker operating mechanism comprises a shell with a central through hole, an end cover is provided at one end of the shell, a center hole is provided on the end cover, an overtravel cylinder with an open end is provided in the shell, the open end is the end close to the end cover, an overtravel spring is provided in the overtravel cylinder, a slider for compressing the overtravel spring is provided at the end of the overtravel spring close to the opening of the overtravel cylinder, the slider is located in the overtravel cylinder and cooperates with the overtravel cylinder opening, a connecting rod for transmission connection with the operating mechanism and cooperating with the center hole of the end cover is fixedly connected to the slider, the connecting rod extends out of the end cover, a moving end is provided at the end of the overtravel cylinder away from the end cover, a travel spring for simulating the closing self-closing force of the vacuum circuit breaker is provided in the shell, the travel spring is sleeved on the outside of the overtravel cylinder and is located between the end cover and the moving end, a static end cooperating with the moving end is provided on the end of the shell away from the end cover, and the overtravel spring and the travel spring are in a compressed state when assembled.

[0007] Furthermore, a cylinder body which is slidably matched with the overtravel cylinder is provided on the end cover, and a guide ring is provided between the overtravel cylinder and the cylinder body.

[0008] Furthermore, a guide sleeve is provided between the slider and the overtravel cylinder.

[0009] Furthermore, an axial exhaust hole is opened on the static end.

[0010] Furthermore, a radial through hole is formed at one end of the connecting rod away from the end cover, a pin is provided in the radial through hole, and a U-shaped pin is installed on the pin.

[0011] Furthermore, an overtravel spring gasket is provided between the slider and the overtravel spring.

[0012] Furthermore, an overtravel spring base is provided between the overtravel spring and one end of the overtravel cylinder away from the opening.

[0013] Furthermore, a travel spring gasket is provided between the end cover and the travel spring.

[0014] Furthermore, the shell and the end cover are connected via a flange, and the shell and the static end are connected via a flange.

[0015] Furthermore, a pad is provided at the connection between the static end and the shell.

[0016] Beneficial effects: The simulated load test fixture of the vacuum circuit breaker operating mechanism of the present invention is an improved invention. The simulated load test fixture of the vacuum circuit breaker operating mechanism of the present invention simulates the arc extinguishing chamber housing through a shell, and an overtravel spring and a stroke spring are arranged in the shell. The stroke spring simulates the closing self-closing force of the vacuum circuit breaker, and the overtravel spring is used to simulate the pressure of the closing holding spring in the vacuum arc extinguishing chamber on the moving contact, so as to simulate the real load state of the arc extinguishing chamber of the vacuum circuit breaker; the connecting rod on the slider is connected to the operating mechanism in a transmission manner, and can move up and down to compress the overtravel spring under the action of the output crank arm pull rod of the operating mechanism, and the overtravel spring is used to increase the pressing force between the moving end and the static end to achieve reliable closing. The simulated load test fixture of the vacuum circuit breaker operating mechanism of the present invention can achieve effective breaking under the action of the output crank arm pull rod of the operating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the appearance of an embodiment of a simulated load test tool for a vacuum circuit breaker operating mechanism of the present invention; Figure 2 The invention is a simulated load test tool for the vacuum circuit breaker operating mechanism Figure 1 Schematic diagram of the internal structure of an embodiment.

[0018] In the figure: 1. shell; 2. end cover; 3. overtravel cylinder; 4. overtravel spring; 5. slider; 6. connecting rod; 7. moving end; 8. travel spring; 9. static end; 10. cylinder; 11. upper guide ring; 12. lower guide ring; 13. guide sleeve; 14. exhaust hole; 15. pin; 16. U-shaped pin; 17. overtravel spring gasket; 18. overtravel spring base; 19. travel spring gasket; 20. upper flange; 21. lower flange; 22. pad. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0020] The simulated load test fixture of the vacuum circuit breaker operating mechanism of the present invention is provided with an overtravel spring and a stroke spring in a shell, the stroke spring is used to simulate the closing self-closing force of the vacuum interrupter, the overtravel spring is used to simulate the pressure of the closing holding spring in the vacuum interrupter on the moving contact, the real load state of the vacuum circuit breaker is simulated, and the effective breaking of the simulated load test fixture of the vacuum circuit breaker operating mechanism of the present invention is realized.

[0021] In a basic embodiment, Figure 1 , 2As shown, an end cover 2 is provided at the upper end of the shell 1, and a center hole is opened on the end cover 2. An overtravel cylinder 3 is provided inside the shell 1, and an overtravel spring 4 is provided in the overtravel cylinder 3. A slider 5 is provided at the upper end of the overtravel spring 4, and a stopper is provided at the opening of the overtravel cylinder 3 to prevent the slider 5 from popping out of the overtravel cylinder. A connecting rod 6 is fixedly connected to the slider 5, and the connecting rod 6 can be transmission-connected with the output crank arm of the operating mechanism. The connecting rod 6 can move up and down under the action of the output crank arm of the operating mechanism. A moving end 7 is provided at the lower end of the overtravel cylinder 3, and a travel spring 8 for simulating the closing self-closing force of the vacuum circuit breaker is provided between the moving end 7 and the end cover 2. The travel spring 8 is sleeved on the outside of the overtravel cylinder 3, and a static end 9 is provided at the lower end of the shell 1, and the static end 9 corresponds to the moving end 7. When the entire test fixture is assembled, the overtravel spring 4 and the travel spring 8 are both in a compressed state. After the connecting rod 6 is connected to the operating mechanism, there is a gap between the moving end 7 and the static end 9 when the operating mechanism is in the open state.

[0022] In a preferred embodiment, a barrel 10 is arranged below the end cover 2, the overtravel cylinder 3 is installed in the barrel 10 and can slide in the barrel 10, and an upper guide ring 11 and a lower guide ring 12 are also arranged between the overtravel cylinder 3 and the barrel 10. The barrel 10 can play a guiding role in the process of the overtravel cylinder 3 moving up and down. When the gap between the overtravel cylinder 3 and the barrel 10 is large, the upper guide ring 11 and the lower guide ring 12 can also play a guiding role in the process of the overtravel cylinder 3 moving up and down, so as to avoid the overtravel cylinder 3 from tilting during the movement and affecting the test results.

[0023] In other embodiments, the number of guide rings may be one or more, or no guide rings may be provided, and the gap between the cylinder 10 and the over-travel cylinder 3 is small, and the over-travel cylinder 3 is guided only by the cylinder 10 to ensure that the over-travel cylinder 3 does not tilt during movement.

[0024] In a preferred embodiment, a guide sleeve 13 is provided between the slider 5 and the overtravel cylinder 3 to ensure that the slider 5 will not be skewed when moving up and down in the overtravel cylinder 3, and the force applied to the overtravel spring 4 is always in one direction to avoid affecting the test results.

[0025] In other embodiments, a guide sleeve may not be provided between the slider 5 and the overtravel cylinder 3, but the gap between the slider 5 and the overtravel cylinder 3 must be small, and the slider 5 will never be skewed in the overtravel cylinder 3, which can also prevent the test results from being affected.

[0026] In a preferred embodiment, an axial exhaust hole 14 is opened on the static end 9. When the operating mechanism is tested, the air between the moving end 7 and the static end 9 in the tooling can be discharged in time through the exhaust hole 14 to prevent the air from affecting the test and ensure that the test results are more accurate.

[0027] In other embodiments, the entire tooling can be sealed and the shell 1 can be evacuated. The entire tooling is in a vacuum state, and no external factors will affect the test.

[0028] In a preferred embodiment, a radial through hole is opened at the upper end of the connecting rod, and a pin shaft 15 is arranged in the through hole. A U-shaped pin 16 is connected to the pin shaft 15, and the output crank arm pull rod of the operating mechanism is connected to the connecting rod through the pin shaft 15 and the U-shaped pin 16. When the operating mechanism is opened or closed, the output crank arm pull rod of the operating mechanism will drive the connecting rod to move up and down, thereby making the moving end 7 and the static end 9 contact or separate.

[0029] In other embodiments, the connecting rod 6 can be connected to the output crank arm pull rod of the operating mechanism through a crank transmission, and the connecting rod 6 can also be moved up and down under the drive of the output crank arm pull rod of the operating mechanism to make the moving end 7 and the static end 9 contact or separate.

[0030] In a preferred embodiment, an over-travel spring gasket 17 is arranged between the slider 5 and the over-travel spring 4, which can reduce the wear of the over-travel spring 4 and extend the service life of the over-travel spring 4; in other embodiments, the slider 5 can be welded to the over-travel spring 4, and no wear will occur between the over-travel spring 4 and the slider 5, thereby extending the service life of the over-travel spring 4.

[0031] In a preferred embodiment, an over-travel spring base 18 is provided at the bottom of the over-travel cylinder 3, and the over-travel spring 4 is installed on the over-travel spring base 18, which can reduce the wear of the lower end of the over-travel spring 4 and extend the service life; in other embodiments, the over-travel spring 4 can be welded to the bottom of the over-travel cylinder 3, which can also extend the service life of the over-travel spring 4.

[0032] In a preferred embodiment, a travel spring gasket 19 is arranged between the end cover 2 and the travel spring 8, which can reduce the wear between the travel spring 8 and the end cover 2 during use and extend the service life of the travel spring 8; in other embodiments, the travel spring 8 can be welded to the end cover 2, and there is no wear between the travel spring 8 and the end cover 2, which can also extend the service life of the travel spring 8.

[0033] In a preferred embodiment, the end cover 2 is connected to the shell 1 via an upper flange 20, and the static end 9 is connected to the shell 1 via a lower flange 21. The flange connection can facilitate the installation and disassembly of the test tooling, and makes the maintenance of the test tooling more convenient. In other embodiments, the end cover 2 and the static end 9 can be directly welded together with the shell 1, so that the overall structure of the test tooling can be more stable.

[0034] In a preferred embodiment, the static end 9 is connected to the shell 1 via a flange, and a gasket 22 is provided at the connection between the static end 9 and the shell 1, which can reduce the wear between the static end 9 and the shell 1 and extend the service life of the test fixture.

[0035] The specific implementation of the simulated load test tool for the vacuum circuit breaker operating mechanism of the present invention is as follows: The simulated load test fixture of the vacuum circuit breaker operating mechanism of the present invention is connected to the operating mechanism. When the operating mechanism is closed, the output crank arm pull rod of the operating mechanism drives the connecting rod 6 to move downward, so that the overtravel cylinder 3 gradually moves downward, and the moving end 7 contacts the static end 9. As the slider 5 continues to move downward, the overtravel spring 4 is gradually compressed, and the positive pressure of the overtravel spring 4 on the moving end 7 gradually increases, so that the gap between the moving end 7 and the static end 9 is reduced, so that the test fixture can achieve reliable closing. At the same time, in the process of the moving end 7 gradually moving downward to contact with the static end 9, the compression degree of the travel spring 8 is gradually reduced, and the pressure of the travel spring 8 on the moving end 7 is also gradually reduced, so as to simulate the change of the closing self-closing force in the vacuum arc extinguishing chamber, so as to simulate the real load condition in the arc extinguishing chamber of the vacuum circuit breaker. When the operating mechanism opens, the output crank arm pull rod of the operating mechanism drives the connecting rod 6 to move upward, and the overtravel spring 4 in a compressed state applies an upward force to the slider 5. The slider 5 moves upward under the action of the connecting rod 6 and the overtravel spring 4 until it is stopped by the stopper at the opening of the overtravel cylinder 3. The moving end 7 and the static end 9 are gradually separated to realize the rapid opening of the test fixture. In the process of the moving end 7 moving upward, the compression degree of the travel spring 8 is gradually increased, and the pressure on the moving end 7 is also gradually increased, simulating the actual load conditions in the arc extinguishing chamber of the vacuum circuit breaker.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A simulated load test fixture for a vacuum circuit breaker operating mechanism, comprising a shell with a central through hole, an end cover at one end of the shell, and a center hole on the end cover, characterized in that: An overtravel cylinder with an open end is provided in the shell, and the open end is an end close to the end cover. An overtravel spring is provided in the overtravel cylinder, and a slider for compressing the overtravel spring is provided at the end of the overtravel spring close to the opening of the overtravel cylinder. The slider is located in the overtravel cylinder and cooperates with the overtravel cylinder opening to stop. A connecting rod that cooperates with the center hole of the end cover and is used for transmission connection with the operating mechanism is fixedly connected to the slider, and the connecting rod extends out of the end cover. A moving end is provided at the end of the overtravel cylinder away from the end cover. A travel spring for simulating the closing self-closing force of a vacuum circuit breaker is provided in the shell, and the travel spring is sleeved on the outside of the overtravel cylinder and located between the end cover and the moving end. A static end that cooperates with the moving end is provided on the end of the shell away from the end cover, and the overtravel spring and the travel spring are in a compressed state during assembly.

2. The simulated load test fixture for vacuum circuit breaker operating mechanism according to claim 1, characterized in that: The end cover is provided with a cylinder body which is slidably matched with the overtravel cylinder, and a guide ring is provided between the overtravel cylinder and the cylinder body.

3. The simulated load test fixture for vacuum circuit breaker operating mechanism according to claim 1 or 2, characterized in that: A guide sleeve is arranged between the slide block and the overtravel cylinder.

4. The simulated load test fixture for the vacuum circuit breaker operating mechanism according to claim 1 or 2, characterized in that: An axial exhaust hole is provided on the static end.

5. The simulated load test fixture for vacuum circuit breaker operating mechanism according to claim 1 or 2, characterized in that: A radial through hole is formed at one end of the connecting rod away from the end cover, a pin is arranged in the radial through hole, and a U-shaped pin is installed on the pin.

6. The simulated load test fixture for vacuum circuit breaker operating mechanism according to claim 1 or 2, characterized in that: An overtravel spring gasket is arranged between the slider and the overtravel spring.

7. The simulated load test fixture for vacuum circuit breaker operating mechanism according to claim 1 or 2, characterized in that: An overtravel spring base is arranged between the end of the overtravel cylinder away from the opening and the overtravel spring.

8. The simulated load test fixture for vacuum circuit breaker operating mechanism according to claim 1 or 2, characterized in that: A travel spring gasket is arranged between the end cover and the travel spring.

9. The simulated load test fixture for vacuum circuit breaker operating mechanism according to claim 1 or 2, characterized in that: The shell and the end cover are connected via a flange, and the shell and the static end are connected via a flange.

10. The simulated load test fixture for vacuum circuit breaker operating mechanism according to claim 9, characterized in that: A pad is provided at the connection between the static end and the shell.

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