Vacuum circuit breaker closing bounce eliminating device and vacuum circuit breaker

Abstract

The invention relates to the technical field of vacuum circuit breakers, in particular to a vacuum circuit breaker closing bounce eliminating device and a vacuum circuit breaker. The vacuum circuit breaker closing bounce eliminating device comprises a static end cover plate of a switch sleeve, a conductive limiting sleeve is fixedly arranged on the static end cover plate, a static end conductive seat is movably installed in the conductive limiting sleeve in the axial direction, and the static end conductive seat is in conductive connection with the conductive limiting sleeve. A static end connecting structure used for being fixedly connected with the static end of the arc extinguish chamber is arranged at the end, away from the static end cover plate, of the static end conductive base, a buffer spring is installed at the other end of the static end conductive base in an abutting mode, and a limiting structure is arranged between the static end conductive base and the conductive limiting sleeve. The limiting structure can limit the limit position of the static end conductive seat under the jacking action of the buffer spring, so that the initial pre-tightening force of the buffer spring is controlled, an operator can quickly and accurately select the buffer spring with proper performance according to the pre-tightening force requirement, and the energy release process of the buffer spring does not affect the closing retaining spring.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum circuit breakers, and in particular to a vacuum circuit breaker closing bounce elimination device and a vacuum circuit breaker. Background Art

[0002] At present, vacuum circuit breakers all adopt a flat-plate butt-jointed contact structure. In order to ensure good contact of the butt-jointed contact structure, a closing holding spring needs to be set on the moving contact. When closing, the moving contact collides with the fixed static contact at a certain closing speed. According to the law of conservation of momentum, the moving contact will definitely move away from the static contact at a certain initial velocity and compress the closing holding spring. The compressed closing holding spring will give the moving contact a force toward the static contact to make the moving contact hit the static contact again. This process will be repeated until the energy is consumed and the moving and static contacts finally complete the closing. The process of repeated bouncing of the moving contact when the vacuum circuit breaker is closed is called closing bounce. The longer the closing bounce time, the longer the closing pre-breakdown time will be, and then the ablation time will also be longer. The surface quality of the contact surface will be reduced due to long-term ablation, which will reduce the breaking capacity and electrical life of the vacuum interrupter.

[0003] A Chinese invention patent application with application publication number CN117542693A discloses a closing buffer device for a vacuum circuit breaker and a combination electrical appliance, the combination electrical appliance comprising a closing buffer device arranged in a shell, the closing buffer device comprising a conductive seat fixed at the static end of the arc extinguishing chamber and a hollow conductive rod plugged and conductively matched with the conductive seat, the conductive seat is provided with a socket for inserting the end of the hollow conductive rod, a spring contact finger is provided between the hole wall of the socket and the outer peripheral surface of the hollow conductive rod, a movable buffer block, a first elastic member and a relatively fixed tightening structure are provided in the hollow conductive rod, and a conductive rod is connected to the guide seat, the conductive rod passes through the buffer block and cooperates with the buffer block guide, the tightening structure is a top plate separately arranged in the hollow conductive rod, the top plate is movably arranged in the hollow conductive rod along the axial direction of the hollow conductive rod, a plug is provided at one end of the hollow conductive rod away from the conductive seat, and the plug is fixed in the hollow conductive rod by a screw. An adjusting screw is threadedly connected to the plug, and the first elastic member, i.e., a cylindrical coil spring, is top-mounted between the buffer block and the top plate. After the adjusting screw is adjusted, the position of the top plate relative to the hollow conductive rod is fixed. After installation, the first elastic member is in a pre-compression state, so that the end face of the buffer block is in elastic pressure contact with the conductive seat. When a closing bounce occurs during the closing process, the closing bounce energy is transmitted to the buffer block through the conductive seat. The buffer block moves by further compressing the first elastic member to consume the closing bounce energy, thereby weakening the closing bounce energy.

[0004] However, during the energy dissipation process of the first elastic member in the above-mentioned closing buffer device of the vacuum circuit breaker, the buffer block will be pushed to move together with the static end of the arc extinguishing chamber toward the closing holding device, which is very likely to affect the closing holding spring in the closing holding device, causing additional pressure or interference, affecting its normal operation. However, if you want to avoid the situation where the first elastic member excessively discharges energy and affects the closing holding spring, while ensuring the reliable buffering effect of the first elastic member, the operator needs to repeatedly test and adjust the first elastic member, which greatly increases the energy and time cost invested by the operator, which is time-consuming and laborious. Summary of the invention

[0005] The object of the present invention is to provide a vacuum circuit breaker closing bounce elimination device to solve the problem that the elastic member in the closing buffer device in the prior art may affect the closing holding spring during the energy dissipation process, resulting in the need for repeated tests and adjustments to select a suitable elastic member, which is time-consuming and laborious. The object of the present invention is also to provide a vacuum circuit breaker to solve the problem that the elastic member in the closing buffer device in the prior art may affect the closing holding spring during the energy dissipation process, resulting in the need for repeated tests and adjustments to select a suitable elastic member, which is time-consuming and laborious.

[0006] To achieve the above-mentioned purpose, the technical solution of the vacuum circuit breaker closing bounce elimination device provided by the present invention is: the vacuum circuit breaker closing bounce elimination device includes a static end cover plate of a switch sleeve, a conductive limit sleeve is fixedly arranged on the static end cover plate, a static end conductive seat is movably installed in the conductive limit sleeve along the axial direction, the static end conductive seat is conductively connected to the conductive limit sleeve, a static end connecting structure for fixedly connecting the static end of the arc extinguishing chamber is arranged at one end of the static end conductive seat away from the static end cover plate, a buffer spring is installed on the top of the other end of the static end conductive seat, a limiting structure is arranged between the static end conductive seat and the conductive limit sleeve, and the limiting structure is used to limit the extreme position of the static end conductive seat under the top pressure of the buffer spring to control the initial preload force of the buffer spring.

[0007] As a further improvement, an anti-collision pad is provided at the limiting structure between the static end conductive seat and the conductive limiting sleeve.

[0008] As a further improvement, the limiting structure includes an outer boss protruding toward the periphery and arranged at one end of the static end conductive seat, and an inner boss arranged at the corresponding end of the conductive limiting sleeve, the inner boss protruding toward the inside of the conductive limiting sleeve, and the anti-collision pad is arranged on one of the inner and outer bosses.

[0009] As a further improvement, the conductive limiting sleeve is conductively connected to the static end conductive seat by cooperating with the outer boss.

[0010] As a further improvement, the limiting structure includes an outer boss protruding toward the periphery and provided at one end of the static end conductive seat, and an inner boss protruding toward the inside of the conductive limiting sleeve and provided at the corresponding end of the conductive limiting sleeve. The inner boss protrudes toward the inside of the conductive limiting sleeve.

[0011] As a further improvement, a spring core rod is fixed on the static end cover plate, the buffer spring is sleeved on the spring core rod, and a spring centering spacer is provided at the end of the buffer spring away from the static end cover plate. The spring centering spacer centers the buffer spring relative to the spring core rod and separates the buffer spring from the static end conductive seat.

[0012] As a further improvement, a centering gasket is arranged on the static end cover plate corresponding to the buffer spring, and the centering gasket is arranged coaxially with the spring centering spacer.

[0013] As a further improvement, an end of the spring centering spacer close to the buffer spring is provided with an insertion section coaxially inserted into the buffer spring, and the spring centering spacer is also provided with an outer flange that is press-fitted with the end of the buffer spring.

[0014] As a further improvement, the static end conductive seat is provided with a center hole, one end of the spring core rod extends into the center hole, and an anti-collision pad corresponding to the spring core rod is arranged in the center hole.

[0015] The beneficial effect is as follows: the present invention provides a new vacuum circuit breaker closing bounce elimination device. The limiting structure between the static end conductive seat and the conductive limiting sleeve can accurately control the preload force of the buffer spring by limiting the limit position of the static end conductive seat under the top pressure of the buffer spring, so that the operator can select a buffer spring with suitable performance according to the preload force requirement, thereby simplifying the selection process and reducing the trial and error cost. At the same time, the limiting structure can ensure that the buffer spring reaches a suitable preload force after assembly, thereby ensuring that the buffer spring can respond quickly and fully absorb and convert kinetic energy when it is impacted by the kinetic energy of the vacuum arc extinguishing chamber. And in the process of buffer spring energy discharge, the limit position of the static end conductive seat is limited by the limiting structure, ensuring that the static end conductive seat is only pushed to the position of the limiting structure at most during the recovery of the buffer spring, and will not cause additional pressure on the closing holding spring, thereby preventing potential damage to the closing holding spring, thereby ensuring the long-term stable use of the closing holding spring.

[0016] To achieve the above-mentioned purpose, the technical solution of the vacuum circuit breaker provided by the present invention is: the vacuum circuit breaker includes a switch sleeve and a vacuum circuit breaker closing bounce elimination device arranged in the switch sleeve, the vacuum circuit breaker closing bounce elimination device includes a static end cover plate of the switch sleeve, a conductive limit sleeve is fixedly arranged on the static end cover plate, a static end conductive seat is movably installed in the conductive limit sleeve along the axial direction, the static end conductive seat is conductively connected to the conductive limit sleeve, a static end connecting structure for fixedly connecting the static end of the arc extinguishing chamber is arranged at one end of the static end conductive seat away from the static end cover plate, a buffer spring is installed on the top of the other end of the static end conductive seat, a limiting structure is arranged between the static end conductive seat and the conductive limit sleeve, and the limiting structure is used to limit the limit position of the static end conductive seat under the top pressure of the buffer spring to control the initial preload force of the buffer spring.

[0017] As a further improvement, an anti-collision pad is provided at the limiting structure between the static end conductive seat and the conductive limiting sleeve.

[0018] As a further improvement, the limiting structure includes an outer boss protruding toward the periphery and arranged at one end of the static end conductive seat, and an inner boss arranged at the corresponding end of the conductive limiting sleeve, the inner boss protruding toward the inside of the conductive limiting sleeve, and the anti-collision pad is arranged on one of the inner and outer bosses.

[0019] As a further improvement, the conductive limiting sleeve is conductively connected to the static end conductive seat by cooperating with the outer boss.

[0020] As a further improvement, the limiting structure includes an outer boss protruding toward the periphery and provided at one end of the static end conductive seat, and an inner boss protruding toward the inside of the conductive limiting sleeve and provided at the corresponding end of the conductive limiting sleeve. The inner boss protrudes toward the inside of the conductive limiting sleeve.

[0021] As a further improvement, a spring core rod is fixed on the static end cover plate, the buffer spring is sleeved on the spring core rod, and a spring centering spacer is provided at the end of the buffer spring away from the static end cover plate. The spring centering spacer centers the buffer spring relative to the spring core rod and separates the buffer spring from the static end conductive seat.

[0022] As a further improvement, a centering gasket is arranged on the static end cover plate corresponding to the buffer spring, and the centering gasket is arranged coaxially with the spring centering spacer.

[0023] As a further improvement, an end of the spring centering spacer close to the buffer spring is provided with an insertion section coaxially inserted into the buffer spring, and the spring centering spacer is also provided with an outer flange that is press-fitted with the end of the buffer spring.

[0024] As a further improvement, the static end conductive seat is provided with a center hole, one end of the spring core rod extends into the center hole, and an anti-collision pad corresponding to the spring core rod is arranged in the center hole.

[0025] The beneficial effect is as follows: the present invention provides a new vacuum circuit breaker. In the closing bounce elimination device of the vacuum circuit breaker, the limiting structure between the static end conductive seat and the conductive limiting sleeve can accurately control the preload force of the buffer spring by limiting the limit position of the static end conductive seat under the top pressure of the buffer spring, so that the operator can select a buffer spring with suitable performance according to the preload force requirement, thereby simplifying the selection process and reducing the trial and error cost. At the same time, the limiting structure can ensure that the buffer spring reaches a suitable preload force after assembly, thereby ensuring that the buffer spring can respond quickly and fully absorb and convert kinetic energy when it is impacted by the kinetic energy of the vacuum arc extinguishing chamber. In addition, during the energy discharge process of the buffer spring, the limit position of the static end conductive seat is limited by the limiting structure, ensuring that the static end conductive seat is only pushed to the position of the limiting structure at most during the recovery process of the buffer spring, and no additional pressure is caused to the closing holding spring, thereby preventing potential damage to the closing holding spring, thereby ensuring the long-term stable use of the closing holding spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a cross-sectional view of an embodiment of a vacuum circuit breaker closing bounce elimination device provided by the present invention.

[0027] In the figure: 1. Rubber protective pad; 2. Conductive limit sleeve; 3. Guide ring; 4. Strap contact finger; 5. Fastener perforation; 6. Compression spring; 7. Nut; 8. Heat dissipation cap; 9. Static end cover; 10. Centering gasket; 11. Spring centering spacer; 12. Spring core rod; 13. Static end conductive seat; 14. Rubber buffer pad; 15. Vacuum interrupter; 16. Switch sleeve; 17. Closing holding spring; 18. Moving end cover; 19. Inner boss; 20. Outer boss. DETAILED DESCRIPTION

[0028] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0029] Closing bounce will not only cause the arc between contacts to reignite, increase the ablation and wear of the contacts, but in severe cases may even damage the equipment and affect the stable operation of the power system. Therefore, the occurrence of closing bounce must be suppressed. In the vacuum circuit breaker closing buffer device of the prior art cited in the background technology, the first elastic member causes unnecessary movement of the conductive seat and the vacuum arc extinguishing chamber during the energy discharge process, which may affect the closing holding spring. On the basis of ensuring that the first buffer member eliminates the closing bounce energy, in order to avoid its reverse influence on the closing holding spring, the operator is required to repeatedly test and adjust until the performance of the first elastic member meets the actual application situation, which greatly increases the work intensity of the operator, consumes too much time, and is not conducive to the current development needs of vacuum circuit breakers. Based on this, the present invention provides a vacuum circuit breaker closing bounce elimination device and a vacuum circuit breaker to solve the problems existing in the above-mentioned prior art.

[0030] The overall design concept of the vacuum circuit breaker provided by the present invention is: The energy release function of the energy absorbing component required for the buffering of the vacuum circuit breaker is isolated from the spring of the closing holding device, so that the appropriate energy absorbing buffer spring and the closing holding device can be selected most reasonably and conveniently.

[0031] like Figure 1 As shown, the vacuum circuit breaker includes a switch sleeve 16, and the two end flanges of the switch sleeve 16 are connected with a static end cover plate 9 and a dynamic end cover plate 18, and a vacuum interrupter 15 installed in the switch sleeve 16 and extending axially along the switch sleeve 16. The vacuum interrupter 15 includes an outer shell and a static contact and a dynamic contact located in the outer shell. The dynamic and static contacts are arranged front and back along the length direction. The rear end of the dynamic contact extends out of the outer shell and is connected to a closing holding device. The closing holding device drives the dynamic contact to move through its closing holding spring 17 to ensure reliable contact between the dynamic and static contacts. A conductive limit sleeve 2 is fixedly arranged at the static end cover plate 9, and a static end conductive seat 13 is movably installed in the conductive limit sleeve 2 along the axial direction. The static end conductive seat 13 is conductively connected to the conductive limit sleeve 2, and one end of the static end conductive seat 13 away from the static end cover plate 9 is fixedly connected to the static end of the vacuum interrupter 15, and a buffer spring is installed on the top of the other end. When closing the circuit, after the moving contact collides with the static contact, the closing holding spring 17 moves over the travel distance, and the fixedly assembled vacuum interrupter 15 moves toward the static end cover plate 9 together with the static end conductive seat 13. The buffer spring between the static end cover plate 9 and the static end conductive seat 13 absorbs and eliminates excess kinetic energy of the moving contact, reduces repeated collisions between the moving and static contacts, eliminates closing bounce, reduces the possibility of arc reignition, and protects the contacts from additional damage.

[0032] The selection of buffer spring is very important for eliminating the closing bounce. However, the traditional selection method based on experience or estimation is difficult to accurately match the actual needs, and it is necessary to select a suitable buffer spring through repeated tests and adjustments, which increases the selection cost and time. The present invention sets a limiting structure between the static end conductive seat 13 and the conductive limit sleeve 2. The limiting structure can limit the limit position of the static end conductive seat 13 under the top pressure of the buffer spring, and indirectly controls the compression amount of the buffer spring. Therefore, the setting of the limiting structure directly determines the initial preload range of the buffer spring, and then allows the operator to quickly and accurately select a buffer spring with suitable performance parameters, avoiding the process of repeated tests and adjustments, thereby simplifying the selection and replacement process of the buffer spring. In addition, the limiting structure controls the preload of the buffer spring so that the buffer spring has a suitable preload, thereby ensuring that the buffer spring can respond quickly and fully absorb and convert kinetic energy when it is impacted by the kinetic energy of the vacuum interrupter, which helps to reduce impact and vibration, effectively eliminate the closing bounce, and improve the stability and reliability of the vacuum circuit breaker.

[0033] Secondly, when closing the circuit breaker, the kinetic energy of the vacuum interrupter is converted into the potential energy of the buffer spring by compressing the buffer spring. The buffer spring stores a certain amount of energy after being compressed. During the recovery process of the buffer spring, it will experience an energy dissipation process, and the stored energy will be released and converted into the kinetic energy of the static end conductive seat and the vacuum interrupter, causing them to move toward the closing holding spring. The setting of the limit structure can effectively control the energy dissipation process of the buffer spring, ensuring that the static end conductive seat is only pushed to the position of the limit structure at most during the energy dissipation process, which helps to protect the closing holding spring from the influence of additional pressure, prolong its service life, and maintain the stability of the closing operation.

[0034] Based on the overall description of the vacuum circuit breaker of the present invention above, a more specific embodiment is provided below: This embodiment focuses on the specific structure of the limiting structure and provides a detailed description.

[0035] In the process of the buffer spring dissipating energy and pushing the static end conductive seat 13 in the direction of the vacuum arc extinguishing chamber 15 in the reverse direction, in order to avoid the static end conductive seat 13 and the conductive limit sleeve 2 from colliding and causing damage, an anti-collision pad is provided at the limiting structure between the static end conductive seat 13 and the conductive limit sleeve 2, thereby reliably protecting the static end conductive seat and the conductive limit sleeve from damage, significantly reducing the wear between the two, extending the service life, and thus improving the stability and reliability of the entire device. The anti-collision pad is preferably a rubber protective pad 1, so that on the basis of avoiding impact damage, due to the good elasticity of the rubber pad, it can also absorb impact energy, which is conducive to the suppression of closing bounce.

[0036] The static end conductive seat 13 is movably installed in the conductive limit sleeve 2 along the axial direction. The end of the conductive limit sleeve 2 close to the vacuum arc extinguishing chamber 15 protrudes inward to form an inner boss 19, and the end of the static end conductive seat 13 protrudes outward to form an outer boss 20. The inner boss 19 and the outer boss 20 constitute the above-mentioned limiting structure. The inner boss 19 and the outer boss 20 are respectively integrally formed on the conductive limit sleeve 2 and the static end conductive seat 13, saving processing steps and making assembly easier. In other embodiments, the limiting structure of a physical structure can also be a block or a limiting pin set at the corresponding position on the conductive limit sleeve and the static end conductive seat.

[0037] The conductive limit sleeve 2 is conductively connected to the static conductive seat 13 by cooperating with the outer boss 20. In order to achieve smooth guiding cooperation between the conductive limit sleeve 2 and the static conductive seat 13, in this embodiment, a guide ring 3 is provided on the matching surface of the outer boss 20 and the conductive limit sleeve 2. The guide ring 3 can guide the static conductive seat 13 to slide in the conductive limit sleeve 2 to avoid the static conductive seat 13 from deflecting or shaking during movement, and the guide ring 3 can reduce wear and friction during sliding and extend the service life. More preferably, a strap contact finger 4 is also provided on the outer end surface of the outer boss 20 to improve the flow effect.

[0038] The above-mentioned anti-collision pad can be specifically arranged on the inner boss or the outer boss. In the present embodiment, the anti-collision pad is directly pasted on the inner boss 19, so that during the movement of the static end conductive seat, the anti-collision pad fixed on the static conductive limit sleeve 2 has higher stability and longer service life. Alternatively, in other embodiments, a groove can be provided on the static end conductive seat or the conductive limit sleeve, and then the adapted anti-collision pad can be embedded in the groove, and part of the anti-collision pad can be exposed from the groove to ensure the anti-collision between the static end conductive seat and the conductive limit sleeve.

[0039] Based on the overall description of the vacuum circuit breaker of the present invention above, a more specific embodiment is provided below: This embodiment focuses on the detailed description of the specific installation structure of the buffer spring.

[0040] The buffer spring is mounted between the static end conductive seat 13 and the static end cover plate 9. In this embodiment, a spring core rod 12 is fixed on the static end cover plate 9. One end of the spring core rod 12 passes through the static end cover plate 9 and is fixed by a nut 7. The buffer spring is sleeved on the spring core rod 12. One end of the buffer spring is against the static end cover plate 9, and the other end is provided with a spring centering spacer 11. One end of the spring centering spacer 11 serves as the force-bearing end for the static end conductive seat 13 to push. On the one hand, the spring centering spacer can separate the buffer spring from the static end conductive seat, which can prevent the impact from being directly transmitted to the buffer spring, and protect the buffer spring to a certain extent. On the other hand, the buffer spring is centered relative to the spring core rod, so that when the buffer spring is compressed or released, its axis can be kept consistent with the spring core rod, avoiding the skewing or deviation of the buffer spring, reducing the additional friction and wear caused by the shaking or deviation of the spring, and thus extending the service life of the buffer spring.

[0041] In a more preferred embodiment, an insertion section is provided at one end of the spring centering spacer close to the buffer spring, and the insertion section coaxially extends into the buffer spring, which can more accurately control the axial position of the buffer spring relative to the spring core rod, ensuring that the spring always maintains a stable posture during operation, and preventing performance degradation caused by skewness or deviation. In addition, an outer flange that is pressed against the end of the buffer spring is provided on the spring centering spacer, so that the outer flange and the end of the buffer spring can be pressed against each other to determine whether the two are assembled in place, thereby improving installation efficiency.

[0042] In this embodiment, the buffer spring is a compression spring 6 sleeved on a spring core rod. When the switch is closed, the static end conductive seat 13 moves toward the static end cover plate 9, and the static end conductive seat 13 directly pushes the spring centering sleeve 11 to move and compress the compression spring 6 evenly and steadily, thereby avoiding the situation where the compression spring 6 is directly stressed and deviates to one side without being limited, thus affecting the buffering effect. Of course, in other embodiments, the buffer spring can also be a disc spring group arranged between the static end cover plate and the static end conductive seat.

[0043] A centering gasket is provided on the static end cover plate 9 corresponding to the buffer spring. The centering gasket reduces the direct contact between the buffer spring and the static end cover plate, reduces the risk of performance degradation due to friction and wear, and provides a stable support surface for the buffer spring, which is conducive to reducing the shaking of the spring caused by vibration, impact and other factors during operation. Preferably, the centering gasket is a circular gasket that matches the end face of the buffer spring, and the outer periphery of the circular gasket is folded toward the circumference of the buffer spring, so that the outer periphery of the end of the buffer spring can be surrounded, that is, the peripheral position of one end of the buffer spring is accurately defined, ensuring that the buffer spring as a whole will not be offset or skewed, and during the installation of the buffer spring, only one end of the buffer spring needs to be placed in the centering gasket, without the need for complicated positioning and adjustment processes, making the installation of the buffer spring simpler and faster.

[0044] In this embodiment, a centering gasket 10 is provided at one end of the buffer spring, and a spring centering spacer 11 is provided at the other end. The centering gasket 11 is used for peripheral limitation and cooperates with the spring centering spacer for internal centering. The two together act on the buffer spring, forming a double centering guarantee, improving the positioning accuracy and stability of the buffer spring, and extending the service life of the buffer spring.

[0045] The centering gasket 11 is preferably a copper gasket. Since the passage of current generates heat, the copper gasket on the static end cover can help dissipate heat, maintain the stable operation of the vacuum circuit breaker, and prevent performance degradation or damage caused by overheating. In addition, the copper gasket can also maintain stable performance for a long time, has a certain wear resistance, and can be used stably for a long time.

[0046] The static end conductive seat 13 is provided with a center hole, one end of the spring core rod 12 extends into the center hole, and an anti-collision pad corresponding to the spring core rod 12 is provided in the center hole. In this embodiment, the anti-collision pad is preferably a rubber buffer pad 14, which is not only easy to be arranged in the center hole, but also convenient to install during maintenance and replacement. In extreme cases such as the above-mentioned buffer spring due to aging or long-term fatigue use, the rubber buffer pad 14 between the spring core rod 12 and the static end conductive seat 13 can significantly reduce the direct impact between the vacuum interrupter 15 and the spring core rod 12, thereby avoiding direct impact and damage to the vacuum interrupter by the spring core rod, providing additional protection and support at critical moments, extending the service life of the vacuum interrupter 15, and ensuring the stable operation of the vacuum circuit breaker.

[0047] Based on the overall description of the vacuum circuit breaker of the present invention above, a more specific embodiment is provided below: This embodiment focuses on a detailed description of how to assemble the closing bounce elimination device.

[0048] The outer end of the static end cover plate 9 is fixed with a heat dissipation cap 8 by bolts. When the vacuum circuit breaker 15 breaks a large current, a large amount of heat energy will be generated. If this heat energy cannot be dissipated in time, it may cause the internal temperature of the circuit breaker to rise, affecting the normal operation of the equipment or even causing damage. The heat dissipation cap 8 effectively transfers the heat generated inside the circuit breaker to the external environment by increasing the surface area, and exchanges heat with the outside air by convection to achieve dynamic balance, thereby keeping the internal temperature of the vacuum circuit breaker within a normal range.

[0049] The other end of the static end cover plate 9 is fixedly assembled with the switch sleeve 16. A conductive limit sleeve 2 is also fixed on the static end cover plate 9 inside the switch sleeve 16. The end face of one end of the conductive limit sleeve 2 is fitted with the static end cover plate 9. Bolt holes are provided on the static end cover plate 9. Bolts are passed through the bolt holes to achieve fixed assembly between the conductive limit sleeve and the static end cover plate.

[0050] The static end conductive seat 13 is fixedly assembled with the vacuum interrupter 15 through the static end connection structure. Specifically, the static end connection structure is a fastener through hole 5 provided on the static end conductive seat 13. After the connection bolt passes through the fastener through hole 5 and is connected to the bolt hole on the vacuum interrupter 15, the nut is tightened to achieve a stable and reliable connection between the static end conductive seat 13 and the vacuum interrupter 15. Figure 1 As shown, in this embodiment, two fastener through holes 5 are provided through the static end conductive seat 13 for inserting connecting bolts to achieve fixed assembly with the vacuum interrupter 15. Figure 1 As shown, the cross-section of the spring centering spacer 11 is a "cross" shape, one end of the two opposite protruding ends extends into the compression spring 6, and the other end is against the static end conductive seat 13, and the other two protruding ends are external flanges pressed against the compression spring 6, one side of the external flange directly presses against the compression spring 6, and the other side is at a certain distance from the static end conductive seat 13, so that operating space can be left when the static end conductive seat 13 and the vacuum arc extinguishing chamber 15 are fixed and assembled by bolts, and the side of the external flange close to the static end conductive seat 13 constitutes an avoidance space for the bolts.

[0051] Of course, in other embodiments, the static end conductive seat and the vacuum interrupter can also be provided with corresponding plug and socket structures, and the static end conductive seat and the vacuum interrupter can be plugged in with interference fit. Alternatively, corresponding internal and external threads can be processed on the vacuum interrupter and the static end conductive seat, and then tightened to achieve connection, which is convenient for installation and easy for disassembly.

[0052] The specific structure of the embodiment of the vacuum circuit breaker closing bounce elimination device of the present invention is the same as the structure of the vacuum circuit breaker closing bounce elimination device in the embodiment of the vacuum circuit breaker introduced above, and will not be repeated herein.

[0053] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0054] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0055] 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 vacuum circuit breaker closing bounce elimination device, characterized in that: A switch sleeve comprises a static end cover plate, the static end cover plate is fixedly provided with a conductive limit sleeve, a static end conductive seat is movably installed in the conductive limit sleeve along the axial direction, the static end conductive seat is conductively connected to the conductive limit sleeve, a static end connecting structure for fixedly connecting the static end of the arc extinguishing chamber is provided at one end of the static end conductive seat away from the static end cover plate, a buffer spring is mounted on the top of the other end of the static end conductive seat, a limiting structure is provided between the static end conductive seat and the conductive limit sleeve, and the limiting structure is used to limit the extreme position of the static end conductive seat under the top pressure of the buffer spring to control the initial preload force of the buffer spring.

2. The vacuum circuit breaker closing bounce elimination device according to claim 1, characterized in that: An anti-collision pad is arranged at the limiting structure between the static end conductive seat and the conductive limiting sleeve.

3. The vacuum circuit breaker closing bounce elimination device according to claim 2, characterized in that: The limiting structure includes an outer boss protruding toward the periphery and arranged at one end of the static end conductive seat and an inner boss arranged at the corresponding end of the conductive limiting sleeve. The inner boss protrudes toward the inside of the conductive limiting sleeve, and the anti-collision pad is arranged on one of the inner and outer bosses.

4. The vacuum circuit breaker closing bounce elimination device according to claim 3, characterized in that: The conductive limiting sleeve is conductively connected to the static end conductive seat by cooperating with the outer boss.

5. The vacuum circuit breaker closing bounce elimination device according to claim 1, characterized in that: The limiting structure comprises an outer boss protruding toward the periphery and arranged at one end of the static end conductive seat, and an inner boss protruding toward the inside of the conductive limiting sleeve and arranged at the corresponding end of the conductive limiting sleeve. The inner boss protrudes toward the inside of the conductive limiting sleeve.

6. The vacuum circuit breaker closing bounce elimination device according to claim 1, characterized in that: A spring core rod is fixed on the static end cover plate, the buffer spring is sleeved on the spring core rod, and a spring centering sleeve is provided at one end of the buffer spring away from the static end cover plate. The spring centering sleeve centers the buffer spring relative to the spring core rod and separates the buffer spring from the static end conductive seat.

7. The vacuum circuit breaker closing bounce elimination device according to claim 6, characterized in that: A centering gasket is arranged on the static end cover plate corresponding to the buffer spring, and the centering gasket is arranged coaxially with the spring centering spacer.

8. The device for eliminating closing bounce of a vacuum circuit breaker according to claim 6, characterized in that: An inserting section coaxially inserted into the buffer spring is arranged at one end of the spring centering spacer close to the buffer spring, and an outer flange press-fitted with the end of the buffer spring is also arranged on the spring centering spacer.

9. The device for eliminating closing bounce of a vacuum circuit breaker according to claim 6, characterized in that: The static end conductive seat is provided with a central hole, one end of the spring core rod extends into the central hole, and an anti-collision pad corresponding to the spring core rod is arranged in the central hole.

10. A vacuum circuit breaker, characterized in that: The invention comprises a switch sleeve and a vacuum circuit breaker closing bounce elimination device arranged in the switch sleeve, wherein the vacuum circuit breaker closing bounce elimination device is the vacuum circuit breaker closing bounce elimination device as described in any one of claims 1 to 9.

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