A movable contact transmission structure and vacuum circuit breaker

Abstract

The application relates to the technical field of high-voltage switches, in particular to a movable contact transmission structure and a vacuum circuit breaker. The movable contact transmission structure comprises a cylindrical movable support, a closing and holding spring structure and a transmission pull rod are arranged in the cylindrical movable support, the transmission pull rod is connected with a spring seat of the closing and holding spring structure, a pushing plate is arranged on a part of a connecting rod of the closing and holding spring structure which passes through the spring seat, a hook locking piece is movably arranged on the spring seat, a sliding cooperation driving mechanism is arranged between the movable support and the spring seat, during movement of the spring seat in a tripping direction, the sliding cooperation driving mechanism can make the hook locking piece move radially inward to protrude from an inner circumferential surface of an axial extension section and be locked with the pushing plate on one side of the pushing plate in the tripping direction, so that the spring seat and the pushing plate are locked. The technical problem that the overall performance of the vacuum circuit breaker in the prior art is reduced due to rebound between the spring seat and the pushing plate during tripping is solved.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch technology, specifically to a moving contact transmission structure and a vacuum circuit breaker. Background Technology

[0002] Existing vacuum circuit breakers often employ a flat-to-flat contact structure. After the moving contact contacts the stationary contact, it stops moving in the closing direction. At this point, the self-closing force of the vacuum interrupter and the closing holding spring in the transmission mechanism provide the necessary contact pressure to the moving contact, ensuring reliable contact between the moving and stationary contacts. Since the self-closing force is relatively small, the closing force is mainly provided by the closing holding spring. To achieve this effect, existing vacuum circuit breakers typically place the closing holding spring 6 on the moving contact side, i.e., between the moving contact and the operating mechanism. However, this structural design introduces problems during opening, affecting the overall breaking capacity and service life of the vacuum circuit breaker, and causing a decline in its overall performance. Specific problems and their causes are detailed below. Figure 1 The vacuum circuit breaker shown is described in detail as an example.

[0003] as follows Figure 1 The diagram shows a vacuum circuit breaker in the prior art, currently in the closed state. The vacuum circuit breaker includes a fixed stationary contact 1, a vacuum bulb 2 housing, and a shielding structure 3. A cylindrical moving support 10 is connected to the end of the shielding structure 3. The moving support 10 houses a moving contact 4 and a closing holding spring mechanism for maintaining the closed state of the moving contact 4. The closing holding spring mechanism includes a connecting rod 5 connected to the end of the moving contact 4 facing away from the stationary contact 1, and a spring seat 7 mounted on the connecting rod 5. A closing holding spring 6 mounted on the connecting rod 5 is disposed between the spring seat 7 and the moving contact 4. The end of the spring seat 7 facing away from the moving contact 4 is connected to an operating mechanism 13 for providing opening and closing forces via a transmission rod 11. An insulating rod 12 is connected between the transmission rod 11 and the operating mechanism 13. Thus, in the closed state, the operating mechanism 13 applies pressure to the closing holding spring 6 via the transmission rod 11 and the spring seat 7 to provide corresponding contact pressure to the moving contact 4.

[0004] A push plate 8 is provided on the part of the connecting rod 5 that passes through the spring seat 7 away from the moving contact 4. When the circuit is opened, the operating mechanism 13 drives the spring seat 7 to move in the opening direction so that the spring seat 7 collides with the push plate 8 and moves, thereby driving the moving contact 4 to move and complete the opening. Specifically, when the vacuum circuit breaker needs to be tripped, the operating mechanism 13 moves the spring seat 7 towards the tripping direction. At this time, under the action of the closing holding spring 6, the moving contact 4, the connecting rod 5, and the push plate 8 set on the connecting rod 5 remain stationary. Only the spring seat 7 moves towards the tripping direction at a certain speed. When the spring seat 7 collides with the push plate 8, the push plate 8 will start to move the moving contact 4 towards the tripping direction under the impact force. Due to the structural characteristics of the actual product, such as the elastic deformation of the insulating rod 12 itself and the fitting clearance between various components, the spring seat 7 will rebound after colliding with the push plate 8, producing a reverse movement. After being rebounded, the spring seat 7 will decelerate to zero under the action of the closing holding spring 6 and the tripping force of the operating mechanism 13 and continue to accelerate towards the tripping direction until it catches up with the push plate 8 and collides and rebounds again. During the entire tripping process, the rebound between the spring seat 7 and the push plate 8 will occur multiple times until the spring seat 7 catches up with the push plate 8 and the two move at the same speed towards the tripping direction, at which point the rebound ends.

[0005] In summary, during the entire opening process, the vacuum circuit breaker will experience multiple rebounds between the spring seat 7 and the push plate 8, causing repeated shaking of the moving end of the vacuum circuit breaker. This results in unstable mechanical performance and severely affects the opening time of the entire vacuum circuit breaker, as well as its breaking capacity and service life. Summary of the Invention

[0006] The purpose of this invention is to provide a moving contact transmission structure to solve the technical problem that the overall performance of a vacuum circuit breaker deteriorates when it is opened due to the rebound between the spring seat and the push plate. Another purpose of this invention is to provide a vacuum circuit breaker to solve the technical problem that the overall performance of a vacuum circuit breaker deteriorates when it is opened due to the rebound between the spring seat and the push plate.

[0007] To achieve the above objectives, the technical solution of the moving contact transmission structure of the present invention is as follows: A moving contact transmission structure includes a cylindrical moving support, within which a closing holding spring structure and a transmission rod are disposed. The transmission rod is connected to a spring seat of the closing holding spring structure. A push plate, which blocks the spring seat in the opening direction and is pushed by the spring seat, is disposed on the connecting rod of the closing holding spring structure at a portion passing through the spring seat. The spring seat has an axial extension section extending towards the push plate on its radially outer side. A hook-locking component is movably mounted on the axial extension section. A sliding engagement drive mechanism is provided between the moving support and the spring seat. During the movement of the spring seat in the opening direction, the sliding engagement drive mechanism drives the hook-locking component to move radially inward when the spring seat collides with the push plate, protruding beyond the inner circumferential surface of the axial extension section and blocking the push plate on the side facing the opening direction, thereby locking the spring seat and the push plate together.

[0008] Beneficial Effects: The moving contact transmission structure of the present invention improves the transmission structure in the existing vacuum circuit breaker. During the opening process, an axial extension section is provided on the spring seat to provide an installation position for the hook locking component. A sliding engagement drive mechanism allows the hook locking component to extend out of the inner circumferential surface of the axial extension section and stop on the side of the push plate facing the opening direction when the spring seat impacts the push plate during the opening process. This hook locking component locks the spring seat and the push plate together, preventing rebound between them. This eliminates the adverse effects of rebound, such as reduced mechanical performance and decreased breaking capacity of the vacuum circuit breaker, thus improving the overall performance and service life of the vacuum circuit breaker. In summary, the moving contact transmission structure of the present invention solves the technical problem of reduced overall performance of the existing vacuum circuit breaker due to rebound between the spring seat and the push plate during opening.

[0009] Furthermore, the hook-lock component is a swing rod that is oscillatingly mounted on the axial extension section about an axially extending axis. Under the action of the sliding engagement drive structure, the swing rod can swing to extend out of the inner circumferential surface of the axial extension section or sink below the inner wall surface of the axial extension section. The sliding engagement drive structure is a groove provided on the inner circumferential surface of the moving support. The groove bends and extends axially along the moving support. The end of the hook-lock component facing the moving support extends into the groove and slides with the groove. During the axial movement of the spring seat relative to the moving support, the bending groove constrains the hook-lock component in the circumferential direction through the groove walls on both sides, causing the hook-lock component to swing.

[0010] Beneficial effects: Through the above design, the hook and lock parts can extend out of the inner circumference of the axial extension section or sink into the side wall of the axial extension section in a swing manner, which can reduce the length of the slide groove on the moving support, making the overall structure more compact, and at the same time facilitating the extension of the hook and lock parts and reducing malfunctions.

[0011] Furthermore, the slide includes axially straight sections at both ends and a transition section connecting the two axially straight sections. The transition section extends in a spiral direction along the inner circumferential surface of the moving support. The central angle of the spiral extension of the transition section on the inner circumferential surface of the moving support enables the swing arm to rotate from a position submerged in the inner wall of the axially extended section to a position extending out of the inner circumferential surface of the axially extended section and then back to a position submerged in the inner wall of the axially extended section within the swing stroke in the same direction.

[0012] Beneficial effects: The chute structure design allows the swing arm to complete the operation from sinking to extending and then sinking again within the same oscillation stroke. This prevents the hook and lock parts from undergoing rapid circumferential changes of course during the axial sliding of the chute and avoids damage to the hook and lock parts from impact with the chute wall.

[0013] Furthermore, the distance between the hook locking member and the root of the inner cavity of the spring seat is the same as the axial dimension of the push plate.

[0014] Beneficial effects: Through the above design, when the push plate and the spring seat just collide, the hook locking component will extend to lock the spring seat and the push plate together, avoiding rebound caused by the presence of a small gap between them, and improving the overall performance of the vacuum circuit breaker.

[0015] Furthermore, the inner circumferential surface of the axially extended section is adapted to the outer contour of the push plate.

[0016] Beneficial effects: The above design facilitates the sliding between the spring seat and the push plate, and allows the spring seat and the push plate to be locked together when the hook lock protrudes from the inner circumferential surface of the axial extension end. The locking is timely, which reduces the length of the hook lock extending into the inner circumferential surface of the axial extension section, thereby reducing the overall length of the hook lock and improving the overall strength to ensure stable locking.

[0017] To achieve the above objectives, the technical solution of the vacuum circuit breaker of the present invention is as follows: A vacuum circuit breaker includes a moving contact, a stationary contact, and an operating mechanism for driving opening and closing. A moving contact transmission structure is provided between the moving contact and the operating mechanism. The moving contact transmission structure includes a cylindrical moving support, within which a closing holding spring structure and a transmission rod are disposed. The transmission rod is connected to a spring seat of the closing holding spring structure. A push plate, which blocks the spring seat in the opening direction and is pushed by the spring seat, is provided on the connecting rod of the closing holding spring structure at a portion passing through the spring seat. The spring seat has an axial extension section extending towards the push plate on the radially outer side of the push plate. A hook locking member is movably mounted on the axial extension section. A sliding engagement drive mechanism is provided between the moving support and the spring seat. During the movement of the spring seat in the opening direction, the sliding engagement drive mechanism drives the hook locking member to move radially inward when the spring seat collides with the push plate, protruding beyond the inner circumferential surface of the axial extension section and blocking the push plate on the side facing the opening direction, thereby locking the spring seat and the push plate together.

[0018] Beneficial Effects: The vacuum circuit breaker of the present invention improves upon existing vacuum circuit breakers by providing an axial extension section on the spring seat during the opening process. This provides a mounting position for the hook-lock component. A sliding engagement drive mechanism allows the hook-lock component to extend from the inner circumferential surface of the axial extension section and stop on the side of the push plate facing the opening direction when the spring seat impacts the push plate during opening. This hook-lock component locks the spring seat and push plate together, preventing rebound between them. This eliminates the adverse effects of rebound, such as reduced mechanical performance and decreased breaking capacity of the vacuum circuit breaker, thus improving the overall performance and service life of the vacuum circuit breaker. In summary, the vacuum circuit breaker of the present invention solves the technical problem of reduced overall performance caused by rebound between the spring seat and push plate during opening in existing vacuum circuit breakers.

[0019] Furthermore, the hook-lock component is a swing rod that is oscillatingly mounted on the axial extension section about an axially extending axis. Under the action of the sliding engagement drive structure, the swing rod can swing to extend out of the inner circumferential surface of the axial extension section or sink below the inner wall surface of the axial extension section. The sliding engagement drive structure is a groove provided on the inner circumferential surface of the moving support. The groove bends and extends axially along the moving support. The end of the hook-lock component facing the moving support extends into the groove and slides with the groove. During the axial movement of the spring seat relative to the moving support, the bending groove constrains the hook-lock component in the circumferential direction through the groove walls on both sides, causing the hook-lock component to swing.

[0020] Beneficial effects: Through the above design, the hook and lock parts can extend out of the inner circumference of the axial extension section or sink into the side wall of the axial extension section in a swing manner, which can reduce the length of the slide groove on the moving support, making the overall structure more compact, and at the same time facilitating the extension of the hook and lock parts and reducing malfunctions.

[0021] Furthermore, the slide includes axially straight sections at both ends and a transition section connecting the two axially straight sections. The transition section extends in a spiral direction along the inner circumferential surface of the moving support. The central angle of the spiral extension of the transition section on the inner circumferential surface of the moving support enables the swing arm to rotate from a position submerged in the inner wall of the axially extended section to a position extending out of the inner circumferential surface of the axially extended section and then back to a position submerged in the inner wall of the axially extended section within the swing stroke in the same direction.

[0022] Beneficial effects: The chute structure design allows the swing arm to complete the operation from sinking to extending and then sinking again within the same oscillation stroke. This prevents the hook and lock parts from undergoing rapid circumferential changes of course during the axial sliding of the chute and avoids damage to the hook and lock parts from impact with the chute wall.

[0023] Furthermore, the distance between the hook locking member and the root of the inner cavity of the spring seat is the same as the axial dimension of the push plate.

[0024] Beneficial effects: Through the above design, when the push plate and the spring seat just collide, the hook locking component will extend to lock the spring seat and the push plate together, avoiding rebound caused by the presence of a small gap between them, and improving the overall performance of the vacuum circuit breaker.

[0025] Furthermore, the inner circumferential surface of the axially extended section is adapted to the outer contour of the push plate.

[0026] Beneficial effects: The above design facilitates the sliding between the spring seat and the push plate. On the other hand, the spring seat and the push plate can be locked together when the hook lock protrudes from the inner circumferential surface of the axial extension end. The locking is timely, which reduces the length of the hook lock extending into the inner circumferential surface of the axial extension section, thereby reducing the overall length of the hook lock and improving the overall strength to ensure stable locking. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the internal structure of a vacuum circuit breaker in the closed state in the prior art. Figure 2 This is a schematic diagram of the internal structure of the vacuum circuit breaker embodiment 1 of the present invention in the closed state; Figure 3 This is a schematic diagram of the internal structure of the vacuum circuit breaker embodiment 1 of the present invention in the state of just opening or just closing. Figure 4 This is a schematic diagram of the internal structure of the vacuum circuit breaker embodiment 1 of the present invention in the open state; Figure 5 This is a schematic diagram of the overall structure of the moving support of Embodiment 1 of the vacuum circuit breaker of the present invention; Figure 6 This is a cross-sectional view of the moving support of Embodiment 1 of the vacuum circuit breaker of the present invention; Figure 7 This is a schematic diagram showing the cooperative relationship between the moving support, spring seat, push plate and swing rod in Embodiment 1 of the vacuum circuit breaker of the present invention.

[0028] Explanation of reference numerals in the attached figures: 1. Stationary contact; 2. Vacuum bulb; 3. Shielding structure; 4. Moving contact; 5. Connecting rod; 6. Closing retaining spring; 7. Spring seat; 8. Push plate; 9. Buffer pad; 10. Moving support; 101. Slide groove; 1011. Axial straight section; 1012. Changing connection section; 11. Transmission rod; 12. Insulating rod; 13. Operating mechanism; 14. Perforation; 15. Rotary hinge; 16. Swing rod; 17. Closing position; 18. First changing position; 19. Second changing position; 20. Opening position. Detailed Implementation

[0029] This invention discloses a vacuum circuit breaker. During the opening process, an axial extension section is provided on the spring seat to provide an installation position for the hook locking component. A sliding engagement drive mechanism allows the hook locking component to extend out of the inner circumferential surface of the axial extension section and stop on the side of the push plate facing the opening direction when the spring seat impacts the push plate during the opening process. This hook locking component secures the spring seat and push plate together, preventing rebound between them. This eliminates the adverse effects of rebound, such as reduced mechanical performance and decreased breaking capacity of the vacuum circuit breaker, thereby improving the overall performance and service life of the vacuum circuit breaker.

[0030] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0031] Specific embodiment 1 of the vacuum circuit breaker provided by the present invention: In this embodiment, as Figure 2 As shown, the vacuum circuit breaker includes a moving contact 4, a stationary contact 1, and an operating mechanism 13 for driving the moving contact 4 to open and close the circuit. A moving contact transmission structure (hereinafter referred to as the transmission structure) is provided between the moving contact 4 and the operating mechanism 13. It also includes a vacuum bulb 2 and a shielding structure 3 provided on the end face of the vacuum bulb 2 facing away from the stationary contact 1. One end of the stationary contact 1 extends into the vacuum bulb 2, and the other end extends out of the vacuum bulb 2. One end of the moving contact 4 also extends into the vacuum bulb 2, and the other end extends out of the vacuum bulb 2 facing away from the stationary end. The moving contact 4 and the vacuum bulb 2 are sealed together by a flexible sealing element.

[0032] The transmission structure includes a cylindrical movable support 10 (hereinafter referred to as the movable support 10) disposed on the side of the shielding structure 3 facing the opening direction. The movable contact 4 is disposed within the movable support 10, and a closing retaining spring 6 mechanism for maintaining the closed state of the movable contact 4 is also disposed within the movable support 10. The closing retaining spring 6 mechanism includes a connecting rod 5 connected to the end of the movable contact 4 facing away from the stationary contact 1 and a spring seat 7 mounted on the connecting rod 5. A closing retaining spring 6 mounted on the connecting rod 5 is disposed between the spring seat 7 and the movable contact 4. The end of the spring seat 7 facing away from the movable contact 4 is connected to an operating mechanism 13 for providing opening and closing force via a transmission rod 11, and an insulating rod 12 is connected between the transmission rod 11 and the operating mechanism 13. Thus, when closing, the operating mechanism 13 applies force to the spring seat 7 through the insulating rod 12 and the transmission rod 11 to compress the closing retaining spring 6 and use the closing retaining spring 6 to provide corresponding contact pressure to the movable contact 4. Figure 2 As shown, in this embodiment, a push plate 8 is provided on the part of the connecting rod 5 that passes through the spring seat 7 at the end facing away from the moving contact 4. At the same time, a buffer pad 9 for buffering is also provided in the inner cavity of the transmission rod 11 facing the push plate 8. When the circuit is opened, the operating mechanism 13 drives the spring seat 7 to move in the opening direction and pushes the push plate 8 to move, thereby driving the moving contact 4 to move and complete the opening.

[0033] like Figure 2 As shown, in this embodiment, the spring seat 7 has an axial extension section extending towards the side of the push plate 8 on the radially outer side of the push plate 8, and the inner circumferential surface of the axial extension section is adapted to the outer contour of the push plate 8, allowing relative sliding between them. A hook-locking member is movably mounted on the axial extension section, and a sliding engagement drive mechanism is provided between the movable support 10 and the spring seat 7. During the movement of the spring seat 7 towards the opening direction, the sliding engagement drive mechanism can drive the hook-locking member to move radially inward to protrude beyond the inner circumferential surface of the axial extension section when the spring seat 7 collides with the push plate 8, and stop it on the side of the push plate 8 facing the opening direction, thereby locking the spring seat 7 and the push plate 8 together.

[0034] This configuration allows the vacuum circuit breaker to be locked together with the spring seat 7 and the push plate 8 during tripping operations using a hook-locking component. This prevents multiple rebounds when the spring seat 7 collides with the push plate 8, which would cause repeated shaking of the moving end of the vacuum circuit breaker, leading to unstable mechanical performance and affecting the tripping time of the entire vacuum circuit breaker. This, in turn, improves the breaking capacity and service life of the vacuum circuit breaker. At the same time, the inner circumferential surface of the axial extension section is designed to fit the outer contour of the push plate 8. This facilitates the sliding between the spring seat 7 and the push plate 8 and allows the spring seat 7 and the push plate 8 to be locked together as soon as the hook-locking component protrudes from the inner circumferential surface of the axial extension section. This timely locking reduces the length of the hook-locking component extending into the inner circumferential surface of the axial extension section, thereby reducing the overall length of the hook-locking component, improving overall strength, and ensuring stable locking.

[0035] Specifically, such as Figure 2 , 7 As shown, a radially extending through hole 14 is provided on the axial extension section. A hook-locking member is hinged in the through hole 14 by a rotary hinge 15. In this embodiment, the hook-locking member is a swing rod 16 hinged on the rotary hinge 15. The swing rod 16 can swing around the axial extension axis through the rotary hinge 15 to extend out of the inner circumferential surface of the axial extension section or sink into the inner wall surface of the axial extension section. The distance between the swing rod 16 and the root of the inner cavity of the spring seat 7 is the same as the axial dimension of the push plate 8. In this way, when the push plate 8 and the spring seat 7 just collide, the swing rod 16 will extend to lock the spring seat 7 and the push plate 8, avoiding rebound caused by the existence of a small gap between them, and improving the overall performance of the vacuum circuit breaker.

[0036] like Figure 5 , 6 As shown, in this embodiment, the sliding engagement drive structure is a groove 101 provided on the inner circumferential surface of the movable support 10 corresponding to the position of the through hole 14. The groove 101 extends along the axial direction of the movable support 10. The end of the rocker arm 16 facing the movable support 10 extends into the groove 101 and slides into the groove 101. Thus, during the axial movement of the spring seat 7 relative to the movable support 10, the curved groove 101 can constrain the rocker arm 16 through the two side groove walls, thereby causing the rocker arm 16 to swing around the axially extended axis. Furthermore, when the circuit is opened, when the spring seat 7 collides with the push plate 8, the rocker arm 16 will swing and protrude from the inner circumferential surface of the axially extended section to block and lock the push plate 8.

[0037] Specifically, such as Figure 6As shown, in this embodiment, the slide 101 consists of three sections from the OA end to the OD end, with the OA end to the OD end being the opening direction. The OA end to the OB end and the OC end to the OD end are both axially straight sections 1011. The two axially straight sections 1011 are connected by a curved connecting section from the OB end to the OC end, and the curved connecting section is used to achieve circumferential lane changing of the two axially straight sections 1011. This arrangement allows the lane-changing connecting section 1012 to extend in the rotational direction along the inner circumferential surface of the moving support 10. Simultaneously, the rocker arm 16 does not rotate when sliding within the axially straight sections 1011 at both ends. The central angle of the rotational extension of the lane-changing connecting section 1012 on the inner circumferential surface of the moving support 10 allows the rocker arm 16 to swing in the same direction.

[0038] When the vacuum circuit breaker is tripped, the swing arm first slides within the axial straight section 1011 from OA to OB. At this time, the position of the swing arm 16 is as follows: Figure 7 As shown, the lever 16 is always at point F, which is the first position, and at this time, the end of the lever 16 facing the axial straight section 1011 is always submerged in the through hole 14. This avoids interference between the lever 16 and the ground push rod during the opening process.

[0039] When the spring seat 7 moves axially to the first change position 18, and the rocker arm 16 slides from the OB end to the OC end, the rocker arm 16 will swing along a swinging arc from the endpoint of the OB end within the lane-changing connecting section 1012. The upper end of the rocker arm 16 will extend out of the through hole 14 and enter the inner cavity of the axial extension section, and as... Figure 3 As shown, when the movement reaches the initial position, that is, when the spring seat 7 first impacts the push rod, the upper end of the swing rod 16 swings out of the inner circumferential surface of the axial extension of the spring seat 7 and abuts against the side of the push plate 8 facing away from the moving contact 4. In this way, the locking connection between the spring seat 7 and the push plate 8 is used to prevent the spring seat 7 from rebounding due to the collision between the spring seat 7 and the push plate 8. At the same time, it can prevent the swing rod 16 from extending when the perforation 14 has not passed the push plate 8 in the axial direction, and prevent the swing rod 16 from interfering with the push plate 8 and causing damage.

[0040] After passing the initial separation position, the swing arm 16 continues to slide along the lane change connection section 1012. The end of the swing arm 16 facing the axial extension section continues to swing and abuts against the end face of the push plate 8 to lock the spring seat 7 and the push plate 8 until the spring seat 7 and the push plate 8 no longer rebound. If their movement speeds are the same, the spring seat 7 moves axially to the second change position 19, and the swing arm 16 can swing along the swing arc into the through hole 14. Of course, in other embodiments, the swing arm 16 may not extend beyond the inner circumference of the axial extension section at the initial separation position, as long as it is ensured that during the opening process, the spring seat 7 and the push plate 8 extend the swing arm 16 except during any collision before the last one. The specific extension time and extension position are controlled by the length from OA to OB, the distance between the end of the swing arm 16 facing the inner circumference of the axial extension section at point F, and the axial length L and circumferential length M from OB to OC.

[0041] When the rocker arm 16 slides to the end point of the OC end, the rocker arm 16 is located as follows: Figure 7 The image shows point S at the second position, where the swing stops. When the swing rod 16 is at point S, one end of it facing the inner cavity of the axial extension section is completely submerged in the countersunk hole. As the swing rod 16 slides along the axial straight section 1011 from the OC end to the OD end, the swing rod 16 remains at point S. When the swing rod 16 moves to the OD end, at this time... Figure 4 As shown, the circuit breaker is in the open position 20, and the opening is complete.

[0042] Through the above design, on the one hand, the rocker arm 16 can be used to lock the spring seat 7 and the push plate 8, avoiding the spring seat 7 from rebounding due to collision during opening, which would cause the moving end of the vacuum circuit breaker to repeatedly shake, thereby improving the overall performance of the vacuum circuit breaker. On the other hand, the slide groove 101 is designed in three sections, which allows the rocker arm 16 to rotate from the position of being submerged in the inner wall of the axial extension section to the position of being extended out of the inner circumferential surface of the axial extension section and then to the position of being submerged in the inner wall of the axial extension section within the swing stroke in the same direction. This avoids the rocker arm 16 from changing its circumferential path rapidly during the axial sliding process along the slide groove 101, and avoids the rocker arm 16 from being damaged by the large impact of the slide groove 101 wall.

[0043] When the vacuum circuit breaker of the present invention performs a closing operation, such as Figure 2 As shown, the operating mechanism 13 drives the insulating pull rod 12 and the transmission pull rod 11 to move in the closing direction, and then the spring seat 7 is driven to move in the closing direction. At this time, due to the supporting force of the closing holding spring 6 itself and the existence of the self-closing force inside the circuit breaker, the push plate 8 will move synchronously with the spring seat 7 and the swing rod 16 will slide along the OD end to the OC end. At this time, the swing rod 16 is in the axial straight section 1011 from the OD end to the OC end and is always at point S.

[0044] As the circuit continues to close, the swing arm 16 will move from the OC end to the OB end. At this time, the swing arm 16 will slide to the lane change connection section 1012 and swing. The end of the swing arm 16 facing the axial extension section will swing along the swing arc to the inner cavity of the axial extension section. However, since the push plate 8 and the spring seat 7 move synchronously at this time, the swing of the swing arm 16 will not cause motion interference.

[0045] When the lever 16 moves to the OB end, the closing process is exactly in the following position. Figure 3 As shown in the diagram, at the point of contact, the rocker arm 16 is submerged in the through hole 14 at point F. Simultaneously, because the moving contact 4 is in contact with the stationary contact 1 at this position, the push plate 8 no longer moves. At this time, the spring seat 7 continues to move in the closing direction under the force of the operating mechanism 13. The spring, compressed by the force of the spring seat 7, generates a closing holding force to press the moving contact 4 firmly onto the stationary contact 1, continuing the closing process until the position is as shown in the diagram. Figure 2 The closing position 17 shown indicates that the closing process is complete.

[0046] Of course, in other embodiments, during the closing process, the swing arm 16 may not swing to point F immediately upon closing, but rather before closing, so as not to interfere with the closing movement of the push plate 8 and the spring seat 7.

[0047] In summary, the vacuum circuit breaker of the present invention provides an installation position for the hook-locking component by providing an axial extension section on the spring seat 7. Utilizing a sliding engagement drive mechanism, during the opening process, when the spring seat 7 impacts the push plate 8, the hook-locking component extends out of the inner circumferential surface of the axial extension section and stops on the side of the push plate 8 facing the opening direction. This hook-locking component locks the spring seat 7 together, preventing rebound between the spring seat 7 and the push plate 8. This eliminates the adverse effects of rebound, such as reduced mechanical performance and decreased breaking capacity of the vacuum circuit breaker, thus improving the overall performance and service life of the vacuum circuit breaker. This solves the technical problem in the prior art where the overall performance of the vacuum circuit breaker deteriorates during opening due to rebound between the spring seat 7 and the push plate 8.

[0048] Embodiment 2 of the vacuum circuit breaker of the present invention: This embodiment provides a different type of sliding engagement drive structure. The difference from Embodiment 1 is that in this embodiment, the hook lock is a pin that is inserted into the through hole of the axial extension section and is adapted to the through hole. The pin can slide radially along the through hole. A sliding groove extending axially is provided on the moving support. The bottom of the sliding groove has an arc-shaped profile. One end of the pin engages with the sliding groove. During the opening process, the pin can slide along the arc-shaped surface. Then, the end of the pin facing the inner cavity of the axial extension section can extend out or sink into the through hole. Then, when the pin passes through the countersunk hole, the pin is used to lock the spring seat and the push plate.

[0049] Embodiment 3 of the vacuum circuit breaker of the present invention: This embodiment provides a different type of sliding engagement drive structure. The difference from Embodiment 1 is that, in this embodiment, under the condition of meeting the usage requirements, the spring seat is provided with an axially extending groove, and a radially extending through hole is opened in the groove. At this time, the hook locking member is a pin that is inserted into the through hole and can slide along the through hole. At this time, the moving support is no longer provided with a groove, but with a protrusion that matches the groove. The axial contour surface of the protrusion is arc-shaped. The pin can sink into the inner wall of the axial extension section or extend out of the inner circumferential surface of the axial extension section along the arc-shaped protrusion during movement. In this way, the pin is used to lock the spring seat and the push plate together when the circuit is opened. At the same time, the arc-shaped surface of the protrusion needs to be designed to be relatively flat to avoid the pin being damaged by a large impact when it engages with the protrusion.

[0050] Embodiment 4 of the vacuum circuit breaker of the present invention: This embodiment provides a different type of chute. The difference from embodiment 1 is that, in this embodiment, under the condition of meeting the usage requirements, the chute may include two axial straight sections at both ends and two sliding sections disposed between the two axial straight sections. The two sliding sections are arranged symmetrically along the axis at their docking positions in a "V" shape. At this time, it is necessary to increase the length of the two sliding sections to make the swing of the rocker arm more gradual and avoid damage to the rocker arm caused by the impact of the chute wall due to the rapid change of the swing direction. At this time, the swing stroke of the rocker arm is bidirectional, that is, it swings from point F in the first position to the vertical position, and then swings from the vertical position to point F in the first position.

[0051] Embodiment 5 of the vacuum circuit breaker of the present invention: This embodiment provides an axial extension section and a push plate with different dimensions from Embodiment 1. In this embodiment, under the condition of meeting the usage requirements, the distance between the hook locking member and the root of the inner cavity of the spring seat can be greater than the axial dimension of the push plate. At this time, when the hook locking member extends out of the inner circumferential surface of the axial extension section, there is still a small gap between the hook locking member and the push plate. However, this gap is smaller than the rebound distance of the spring seat. In this way, the performance of the vacuum circuit breaker is improved by reducing the rebound distance of the spring seat.

[0052] Embodiment 6 of the vacuum circuit breaker of the present invention: This embodiment provides an axial extension section and a push plate with different dimensions. The difference from embodiment 1 is that, in this embodiment, the outer contour dimension of the push plate can be smaller than the inner circumferential surface of the axial extension section when the usage requirements are met. In this case, the length of the swing rod needs to be increased accordingly so that the swing rod can stop on the side of the push plate facing the opening direction when it swings out of the inner circumferential surface of the axial extension section.

[0053] Specific embodiments of the moving contact transmission structure of the present invention: The embodiments of the moving contact transmission structure are the same as the moving contact transmission structure of the vacuum circuit breaker in the above embodiments, and will not be described again here.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A moving contact transmission structure, comprising a cylindrical moving support (10), wherein a closing holding spring (6) structure and a transmission rod (11) are provided inside the cylindrical moving support (10), wherein, The transmission rod (11) is connected to the spring seat (7) of the closing holding spring (6) structure. A push plate (8) is provided on the part of the connecting rod of the closing holding spring (6) structure that passes through the spring seat (7) and is pushed by the spring seat (7) in the opening direction. The spring seat (7) has an axial extension section extending towards the push plate (8) on the radially outer side of the push plate (8). A hook lock is movably installed on the axial extension section. A sliding engagement drive mechanism is provided between the moving support (10) and the spring seat (7). During the movement of the spring seat (7) towards the opening direction, the sliding engagement drive mechanism drives the hook lock to move radially inward when the spring seat (7) collides with the push plate (8), protruding from the inner circumferential surface of the axial extension section and stopping on the side of the push plate (8) facing the opening direction, thereby locking the spring seat (7) and the push plate (8) together. The hook lock is a swing rod (16) that is oscillating on the axial extension section around the axially extending axis. Under the action of the sliding engagement drive structure, the swing rod (16) can swing to extend out of the inner circumferential surface of the axial extension section or sink below the inner wall surface of the axial extension section. The sliding engagement drive structure is a groove (101) provided on the inner circumferential surface of the moving support (10). The groove (101) bends and extends along the axial direction of the moving support (10). One end of the hook lock extends into the groove (101) facing the moving support (10) and slides and engages with the groove (101). During the process of the spring seat (7) moving axially relative to the moving support (10), the curved groove (101) constrains the hook lock in the circumferential direction through the groove walls on both sides, causing the hook lock to swing.

2. The moving contact transmission structure according to claim 1, characterized in that, The slide (101) includes two axial straight sections (1011) at both ends and a lane-changing connecting section (1012) connecting the two axial straight sections (1011). The lane-changing connecting section (1012) extends in a spiral direction along the inner circumferential surface of the moving support (10). The central angle of the spiral extension of the lane-changing connecting section (1012) in the inner circumferential surface of the moving support (10) enables the swing rod (16) to rotate from the position of sinking into the inner wall surface of the axial extension section to the position of extending out of the inner circumferential surface of the axial extension section and then to the position of sinking into the inner wall surface of the axial extension section within the swing stroke in the same direction.

3. The moving contact transmission structure according to claim 1 or 2, characterized in that, The distance between the hook and locking member and the root of the inner cavity of the spring seat (7) is the same as the axial dimension of the push plate (8).

4. The moving contact transmission structure according to claim 1 or 2, characterized in that, The inner circumferential surface of the axial extension section is adapted to the outer contour of the push plate (8).

5. A vacuum circuit breaker, comprising a moving contact (4), a stationary contact (1), and an operating mechanism (13) for driving opening and closing, wherein a moving contact transmission structure for transmission is provided between the moving contact (4) and the operating mechanism (13), characterized in that, The moving contact transmission structure includes a cylindrical moving support (10), which houses a closing holding spring (6) and a transmission rod (11). The transmission rod (11) is connected to a spring seat (7) of the closing holding spring (6). A push plate (8) is provided on the part of the connecting rod of the closing holding spring (6) that passes through the spring seat (7) and is pushed by the spring seat (7) in the opening direction. The spring seat (7) has an axial extension section extending toward the push plate (8) on the radially outer side of the push plate (8). A hook lock is movably installed on the axial extension section. A sliding engagement drive mechanism is provided between the moving support (10) and the spring seat (7). During the movement of the spring seat (7) in the opening direction, the sliding engagement drive mechanism can drive the hook lock to move radially inward when the spring seat (7) collides with the push plate (8). The spring seat (7) is connected to the push plate (8) by protruding from the inner circumferential surface of the axial extension section and blocking the push plate (8) on the side facing the opening direction. The hook lock is a swing rod (16) that is oscillating around the axis of the axial extension section. Under the action of the sliding engagement drive structure, the swing rod (16) can swing to extend out of the inner circumferential surface of the axial extension section or sink below the inner wall surface of the axial extension section. The sliding engagement drive structure is a groove (101) provided on the inner circumferential surface of the moving support (10). The groove (101) bends and extends along the axial direction of the moving support (10). One end of the hook lock extends into the groove (101) facing the moving support (10) and slides and engages with the groove (101). During the axial movement of the spring seat (7) relative to the moving support (10), the curved groove (101) causes the hook lock to swing by constraining the hook lock in the circumferential direction through the groove walls on both sides.

6. The vacuum circuit breaker according to claim 5, characterized in that, The slide (101) includes two axial straight sections (1011) at both ends and a lane-changing connecting section (1012) connecting the two axial straight sections (1011). The lane-changing connecting section (1012) extends in a spiral direction along the inner circumferential surface of the moving support (10). The central angle of the spiral extension of the lane-changing connecting section (1012) in the inner circumferential surface of the moving support (10) enables the swing rod (16) to rotate from the position of sinking into the inner wall surface of the axial extension section to the position of extending out of the inner circumferential surface of the axial extension section and then to the position of sinking into the inner wall surface of the axial extension section within the swing stroke in the same direction.

7. The vacuum circuit breaker according to claim 5 or 6, characterized in that, The distance between the hook and locking member and the root of the inner cavity of the spring seat (7) is the same as the axial dimension of the push plate (8).

8. The vacuum circuit breaker according to claim 5 or 6, characterized in that, The inner circumferential surface of the axial extension section is adapted to the outer contour of the push plate (8).

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