A closing and opening device comprising a plate spring structure for suppressing closing bounce gap

Abstract

The application relates to a closing and opening device comprising a plate spring structure for suppressing a closing bounce gap, which comprises a movable contact positioning seat electrically connected to a lower copper bar, the movable contact positioning seat is rotationally connected to the lower copper bar in the thickness direction of a shell, a movable contact silver point is arranged on the movable contact positioning seat, the movable contact silver point is in communication or separated from a static contact by rotating the movable contact positioning seat, a yoke is arranged on one side of the shell in the length direction, the yoke is sleeved outside the movable contact positioning seat in the horizontal direction, a sliding block is fixed on the movable contact positioning seat, a driving assembly for driving the yoke to move is arranged on the shell, the yoke pulls the two sliding blocks to drive the movable contact positioning seat to rotate, and a plate spring assembly for suppressing the closing bounce gap is arranged on the lower side of the yoke. The application has the effect of reducing the occurrence of a bounce gap between the yoke and the sliding block in the closing process of the movable contact and the static contact.

Description

Technical Field

[0001] This application relates to the technical field of DC circuit breakers, and in particular to a circuit breaker opening and closing device including a leaf spring structure for suppressing closing bounce gap. Background Technology

[0002] In the application of DC circuit breakers, when the moving contact and stationary contact perform the closing action, due to the high speed, large mass, and high hardness of the contact material of the moving contact, a bouncing phenomenon often occurs after the initial contact. The bouncing causes the moving contact to briefly separate from the stationary contact and make contact and separate multiple times in a very short period of time, which adversely affects the closing stability of the circuit breaker. Utility Model Content

[0003] In order to reduce the impact of the gap caused by the bouncing between the fork and the slider during the closing process of the moving and stationary contacts on the closing stability (the bouncing may cause the closing to fail), this application provides a closing and opening device including a leaf spring structure for suppressing the closing bouncing gap.

[0004] The opening and closing device provided in this application, which includes a leaf spring structure for suppressing closing bounce gap, adopts the following technical solution: A closing and opening device including a leaf spring structure for suppressing closing bounce gap is installed inside a DC circuit breaker. The DC circuit breaker includes a housing, an upper copper busbar and a lower copper busbar are arranged inside the housing, a stationary contact is electrically connected to the upper copper busbar, and a moving contact positioning seat is electrically connected to the lower copper busbar. The moving contact positioning seat is rotatably connected to the lower copper busbar around the thickness direction of the housing. A moving contact silver point is provided on the moving contact positioning seat. The moving contact silver point communicates with or separates from the stationary contact as the moving contact positioning seat rotates. A fork is provided on one side of the housing along its length direction. The fork is sleeved on the outside of the moving contact positioning seat in the horizontal direction. A slider is fixed on the moving contact positioning seat. One slider is provided on each side of the moving contact positioning seat along the thickness direction of the housing. A driving assembly for driving the fork to move is provided on the housing. The fork pulls the two sliders to drive the moving contact positioning seat to rotate. A leaf spring assembly for suppressing closing bounce gap is provided on the lower side of the fork.

[0005] By adopting the above technical solution, the structure provides a leaf spring assembly on the underside of the shift fork, ensuring that the shift fork is always subjected to an upward elastic support force during the closing process. This effectively counteracts the counter-thrust force generated by the contact bounce, ensuring a stable fit between the shift fork and the slider, reducing the gap between the shift fork and the slider, and significantly improving the reliability of closing.

[0006] Preferably, the shift fork includes two support rods, which are correspondingly arranged with two sliders. Each support rod has a boss formed on it, and the slider has an arc-shaped surface on the side near the corresponding boss. The bottom surface of the slider abuts against the upper side of the support rod.

[0007] By adopting the above technical solution, by setting two support rods corresponding to the slider and their bosses to cooperate with the bottom surface of the slider, the slider can form a stable contact with the shift fork during the force process, and the arc surface cooperation can drive the slider to swing, thereby driving the moving contact to rotate.

[0008] Preferably, the leaf spring assembly includes a fixed base located on one side of the moving contact positioning base in the width direction. An abutment leaf spring is provided on the fixed base, with its middle part bent upward and abutting against the lower side of the support rod on the corresponding side. An abutment block is also provided on the side of the moving contact positioning base away from the fixed base in the width direction. The end of the abutment leaf spring away from the fixed base abuts against the upper side of the abutment block. Two abutment leaf springs are provided corresponding to the two support rods.

[0009] By adopting the above technical solution, the abutment leaf spring contacts the support rod through the upward bending structure in the middle, and through the fixing and limiting design at both ends, it can suppress the bounce gap while ensuring that the force on the shift fork is uniform, and effectively alleviate the impact of reverse impact on the accuracy of the mechanism's movement.

[0010] Preferably, the end of the abutment spring near the abutment block is bent downwards, and its bent surface abuts against the abutment block. The end of the abutment spring near the abutment block slides and engages with the abutment block along the width direction of the moving contact.

[0011] By adopting the above technical solution, the end of the leaf spring is bent downward and slides to cooperate with the abutment block, so that the leaf spring can adapt to the micro-displacement of the structure during the deformation process, realize flexible limiting and energy absorption, avoid damage to the abutment block caused by overload impact, and further enhance the structural stability.

[0012] Preferably, the shift fork further includes a fixing block, and the two support rods are fixed on the fixing block. The drive assembly includes an electromagnetic actuator and a drive rod. The axis of the drive rod is parallel to the width direction of the housing. The drive rod is rotatably connected to the fixing block about the thickness direction of the housing. The electromagnetic actuator drives the drive rod to move away from the fixing block.

[0013] By adopting the above technical solution, and by introducing a combination of a fixed block, an electromagnetic actuator, and a drive rod into the shift fork structure, the shift fork can precisely and controllably drive the slider, thereby causing the moving contact positioning seat to rotate, achieving a fast response and precise control of the closing operation, and improving the control efficiency of the device.

[0014] Preferably, a positioning block is also fixed on the housing, and a support block is provided on the positioning block. The support block slides and engages with the positioning block in the vertical direction. The upper side of the support block abuts against the lower side of the fixing block. An elastic element is provided between the support block and the positioning block.

[0015] By adopting the above technical solution, the positioning block, the sliding support block and the elastic element constitute a flexible support structure, which enables the fixed block to be auxiliaryly limited and buffered during the closing process, alleviates the impact force of the shift fork mechanism at the moment of force, and improves the dynamic response capability and durability of the overall structure.

[0016] Preferably, a fixing post is fixed at the lower end of the support block, the fixing post penetrates the positioning block in the vertical direction, the fixing post and the positioning block slide in the vertical direction, and the elastic element is a spring, which is sleeved on the fixing post.

[0017] By adopting the above technical solution, the fixed column and the positioning block slide together and a spring is set, so that the elastic limiting structure can flexibly absorb the impact generated by the downward pressing of the shift fork in the vertical direction, enhance the buffering capacity of the leaf spring assembly against dynamic reaction force, and thus protect the long-term stable operation of the device.

[0018] Preferably, two fixing posts are provided at intervals along the thickness direction of the shell.

[0019] By adopting the above technical solution, two fixed columns are spaced apart along the thickness direction of the shell, which can form a more stable elastic support layout and reduce the occurrence of relative rotation between the fixed columns and the positioning blocks.

[0020] Preferably, the electromagnetic actuator includes a housing, and a reset handle is provided on the side of the housing away from the fixed block. The reset handle is rotatably connected to the housing in the direction of the housing thickness, and the lower end of the reset handle abuts against the side of the drive rod away from the fixed block.

[0021] By adopting the above technical solution, the electromagnetic actuator is equipped with a reset handle, which can be manually reset when the device is powered off or malfunctions. The handle and the drive rod form a reliable mechanical contact, ensuring that the reset action is accurate and in place, thereby improving the convenience of equipment maintenance and emergency handling capabilities.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting a leaf spring assembly on the underside of the shift fork, it applies an upward elastic support force during the closing process, effectively offsetting the gap fluctuation caused by the moving contact pushing the shift fork back, avoiding loose contact between the shift fork and the slider, thereby significantly improving the closing stability and reliability of the device; 2. Through the bending design and sliding fit structure of the contact leaf spring, and the flexible limiting system composed of support block, positioning block, elastic element and fixed column, the impact load can be effectively absorbed under the action of contact point bounce or external force impact, reducing the impact wear between parts and improving the durability and service life of the overall structure. 3. By integrating the electromagnetic actuator and the shift fork structure into a coordinated drive mechanism, and setting a reset handle with manual reset function, the device can flexibly switch between automatic drive and manual operation. This not only ensures the response speed and control accuracy of the device, but also improves the safe operation and maintenance convenience of the equipment under abnormal working conditions. Attached Figure Description

[0023] Figure 1 This is an isometric view of the main internal structure of the DC circuit breaker in the embodiments of this application. Figure 2 This is an isometric view of the main structure of the opening and closing device in the embodiments of this application; Figure 3 This is an isometric view of the structure between the drive rod and the fixed block, which is the main feature of the embodiments of this application.

[0024] Reference numerals: 1. DC circuit breaker; 11. Housing; 12. Reset device; 13. Circuit breaker; 14. Upper copper busbar; 15. Lower copper busbar; 2. Moving contact positioning seat; 21. Slider; 22. Moving contact silver dot; 3. Stationary contact; 4. Drive assembly; 41. Electromagnetic actuator; 411. Housing; 412. Reset handle; 42. Drive rod; 5. Fork; 51. Fixing block; 52. Support rod; 6. Leaf spring assembly; 61. Fixing seat; 62. Abutting leaf spring; 63. Abutting block; 7. Positioning block; 71. Support block; 72. Fixing column; 73. Spring. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 This application provides further details.

[0026] This application discloses a closing and opening device including a leaf spring structure for suppressing closing bounce gap.

[0027] See Figures 1-3The DC circuit breaker 1 includes a housing 11, and a closing and opening device with a leaf spring structure for suppressing closing bounce gap is disposed inside the housing 11. The housing 11 is provided with an upper copper busbar 14 and a lower copper busbar 15. The upper copper busbar 14 is electrically connected to a stationary contact 3, including a moving contact positioning seat 2 electrically connected to the lower copper busbar 15. The moving contact positioning seat 2 is rotatably connected to the lower copper busbar 15 around the thickness direction of the housing 11. The moving contact positioning seat 2 is provided with a moving contact silver point 22. The moving contact silver point 22 is connected to or separated from the stationary contact 3 as the moving contact positioning seat 2 rotates. A fork 5 is provided on one side of the length direction of the housing 11. The fork 5 is sleeved on the outside of the moving contact positioning seat 2 in the horizontal direction. A slider 21 is fixed on the moving contact positioning seat 2. There is one slider 21 on each side of the moving contact positioning seat 2 along the thickness direction of the housing 11. The housing 11 is provided with a drive assembly 4 for driving the fork 5 to move. The fork 5 pushes or pulls the two sliders 21 to drive the moving contact positioning seat 2 to rotate. A leaf spring assembly 6 for suppressing the closing bounce gap is provided on the lower side of the fork 5.

[0028] The housing 11 also houses a circuit breaker 13 and a reset device 12. When the DC circuit breaker 1 is in the closed state, the moving contact silver point 22 on the moving contact positioning seat 2 is connected to the stationary contact 3. When the current between the moving contact silver point 22 and the stationary contact 3 is too large, the circuit breaker 13 will press down the fork 5, causing the fork 5 and the two sliders 21 to separate. The reset device 12 will then reset the moving contact positioning seat 2, thereby causing the moving contact silver point 22 to separate from the stationary contact 3. It should be noted that the installation methods of the reset device 12, the circuit breaker 13, and the moving contact silver point 22 on the moving contact positioning seat 2 are all existing structures, and will not be described in detail in this embodiment.

[0029] The drive assembly 4 includes an electromagnetic actuator 41 and a drive rod 42. The electromagnetic actuator 41 is located on one side of the housing 11 in the width direction. The axis of the drive rod 42 is parallel to the width direction of the housing 11. The drive rod 42 extends out of the housing 11 along its own axis and passes through the electromagnetic actuator 41 along its own axis. When the electromagnetic actuator 41 is energized, it drives the drive rod 42 to move away from the housing 11. The electromagnetic actuator 41 includes a housing 411. A reset handle 412 is provided on the side of the housing 411 away from the fixing block 51. The reset handle 412 is rotatably connected to the housing 411 around the thickness direction of the housing 11. The lower end of the reset handle 412 abuts against the side of the drive rod 42 away from the fixing block 51. When the moving contact silver point 22 and the stationary contact 3 need to be normally opened, the electromagnetic actuator 41 does not apply a pushing force to the drive rod 42, and the reset device 12 drives the moving contact positioning seat 2 to reset.

[0030] The shift fork 5 is located on one side of the drive rod 42 inside the housing 11. The shift fork 5 includes a fixing block 51, which is rotatably connected to the drive rod 42 in a direction parallel to the thickness direction of the housing 11. A support rod 52 is provided on the side of the fixing block 51 away from the drive rod 42, and one support rod 52 is provided on each side of the moving contact positioning seat 2 in the thickness direction. In case of power failure or abnormality of the device, manual reset is required. The handle and the drive rod 42 form a reliable mechanical contact, improving the convenience of equipment maintenance and emergency handling capabilities.

[0031] Two support rods 52 are correspondingly arranged with two sliders 21. Each support rod 52 has a boss formed on it, and the slider 21 has an arc-shaped surface on the side near the corresponding boss. A groove is formed on the arc-shaped surface. When the moving contact positioning seat 2 and the stationary contact 3 are in the open state, the upper edge of the boss is embedded in the groove. The leaf spring assembly 6 pushes the support rod 52 so that the upper side of the support rod 52 is always in contact with the bottom surface of the slider 21.

[0032] The leaf spring assembly 6 includes a fixed base 61, which is located on one side of the moving contact positioning seat 2 in the width direction. An abutting leaf spring 62 is provided on the fixed base 61. The middle part of the abutting leaf spring 62 is bent upward and abuts against the lower side of the support rod 52 on the corresponding side. An abutting block 63 is also provided on the side of the moving contact positioning seat 2 away from the fixed base 61 in the width direction. The end of the abutting leaf spring 62 away from the fixed base 61 abuts against the upper side of the abutting block 63. There are two abutting leaf springs 62 corresponding to the two support rods 52.

[0033] Furthermore, the end of the abutment spring 62 near the abutment block 63 bends downward, and its bent surface abuts against the abutment block 63. The end of the abutment spring 62 near the abutment block 63 slides and engages with the abutment block 63 along the width direction of the moving contact.

[0034] A positioning block 7 is also fixed on the housing 11. A support block 71 is provided on the positioning block 7. The support block 71 slides and engages with the positioning block 7 in the vertical direction. The upper side of the support block 71 is arc-shaped. The upper side of the support block 71 abuts against the lower side of the fixing block 51. An elastic element is provided between the support block 71 and the positioning block 7. A fixing post 72 is fixed at the lower end of the support block 71. The fixing post 72 passes through the positioning block 7 in the vertical direction. The fixing post 72 and the positioning block 7 slide and engage in the vertical direction. The elastic element is a spring 73, which is sleeved on the fixing post 72. Two fixing posts 72 are provided at intervals along the thickness direction of the housing 11.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A closing and opening device including a leaf spring structure for suppressing closing bounce gap, disposed within a DC circuit breaker (1), the DC circuit breaker (1) including a housing (11), wherein an upper copper busbar (14) and a lower copper busbar (15) are disposed within the housing (11), and a stationary contact (3) is electrically connected to the upper copper busbar (14), characterized in that: The device includes a moving contact positioning seat (2) electrically connected to the lower copper busbar (15). The moving contact positioning seat (2) is rotatably connected to the lower copper busbar (15) around the thickness direction of the housing (11). A moving contact silver point (22) is provided on the moving contact positioning seat (2). The moving contact silver point (22) is connected to or separated from the stationary contact (3) as the moving contact positioning seat (2) rotates. A fork (5) is provided on one side of the length direction of the housing (11). The fork (5) is sleeved on the moving contact in the horizontal direction. Outside the head positioning seat (2), a slider (21) is fixed on the moving contact positioning seat (2). There is one slider (21) on each side of the moving contact positioning seat (2) along the thickness direction of the housing (11). A driving assembly (4) for driving the shift fork (5) to move is provided on the housing (11). The shift fork (5) pulls the two sliders (21) to drive the moving contact positioning seat (2) to rotate. A leaf spring assembly (6) for suppressing the closing bounce gap is provided on the lower side of the shift fork (5).

2. A closing / opening device according to claim 1, comprising a leaf spring structure for suppressing closing bounce gap, characterized in that: The shift fork (5) includes two support rods (52), which are correspondingly arranged with two sliders (21). Each support rod (52) has a boss formed on it. The slider (21) has an arc-shaped surface on the side near the corresponding boss. The bottom surface of the slider (21) abuts against the upper side of the support rod (52).

3. A closing / opening device according to claim 2, comprising a leaf spring structure for suppressing closing bounce gap, characterized in that: The leaf spring assembly (6) includes a fixed seat (61), which is located on one side of the moving contact positioning seat (2) in the width direction. An abutment leaf spring (62) is provided on the fixed seat (61). The middle part of the abutment leaf spring (62) bends upward and abuts against the lower side of the support rod (52) on the corresponding side. An abutment block (63) is also provided on the side of the moving contact positioning seat (2) away from the fixed seat (61) in the width direction. The end of the abutment leaf spring (62) away from the fixed seat (61) abuts against the upper side of the abutment block (63). There are two abutment leaf springs (62) corresponding to the two support rods (52).

4. A closing / opening device according to claim 3, comprising a leaf spring structure for suppressing closing bounce gap, characterized in that: The end of the abutment spring (62) near the abutment block (63) bends downward, and its bent surface abuts against the abutment block (63). The end of the abutment spring (62) near the abutment block (63) slides and engages with the abutment block (63) along the width direction of the moving contact.

5. A closing / opening device according to claim 2, comprising a leaf spring structure for suppressing closing bounce gap, characterized in that: The shift fork (5) also includes a fixing block (51), and the two support rods (52) are fixed on the fixing block (51). The drive assembly (4) includes an electromagnetic actuator (41) and a drive rod (42). The axis of the drive rod (42) is parallel to the width direction of the housing (11). The drive rod (42) and the fixing block (51) are rotatably connected around the thickness direction of the housing (11). The electromagnetic actuator (41) drives the drive rod (42) to move away from the fixing block (51).

6. A closing / opening device according to claim 5, comprising a leaf spring structure for suppressing closing bounce gap, characterized in that: A positioning block (7) is also fixed on the housing (11). A support block (71) is provided on the positioning block (7). The support block (71) slides and cooperates with the positioning block (7) in the vertical direction. The upper side of the support block (71) abuts against the lower side of the fixing block (51). An elastic element is provided between the support block (71) and the positioning block (7).

7. A closing / opening device according to claim 6, comprising a leaf spring structure for suppressing closing bounce gap, characterized in that: The lower end of the support block (71) is fixed with a fixing column (72), the fixing column (72) passes through the positioning block (7) in the vertical direction, the fixing column (72) and the positioning block (7) slide in the vertical direction, the elastic element is set as a spring (73), and the spring (73) is sleeved on the fixing column (72).

8. A closing / opening device according to claim 7, comprising a leaf spring structure for suppressing closing bounce gap, characterized in that: Two fixed columns (72) are provided at intervals along the thickness direction of the shell (11).

9. A closing / opening device according to claim 5, comprising a leaf spring structure for suppressing closing bounce gap, characterized in that: The electromagnetic actuator (41) includes a housing (411). A reset handle (412) is provided on the side of the housing (411) away from the fixed block (51). The reset handle (412) is rotatably connected to the housing (411) around the thickness direction of the housing (11). The lower end of the reset handle (412) abuts against the side of the drive rod (42) away from the fixed block (51).

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