Mechanical anti-bouncing device of ring main unit mechanism
By utilizing the mechanical anti-pumping device of the ring main unit mechanism, and through the contact-disengagement of the push rod and the self-resetting structure of the push plate, the problem of secondary closing of the circuit breaker in a fault circuit is solved, thus realizing the reliable operation and mechanical anti-pumping function of the circuit breaker and improving the safety and stability of the circuit breaker.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENHENG ELECTRIC EQUIP CO LTD
- Filing Date
- 2026-04-14
- Publication Date
- 2026-05-19
AI Technical Summary
In the existing technology, when a circuit breaker is closed to a fault circuit, the protection action cannot be released, resulting in continuous and repetitive abnormal actions of closing-tripping-reclosing. This cannot be reliably blocked at the mechanical structure level, affecting the mechanical life of the circuit breaker and the safety of the power grid.
Design a mechanical anti-jump device for a ring main unit. Through an energy storage mechanism, a closing mechanism, and a toggle plate structure, the device utilizes the cooperation of a push rod, a toggle plate, and a tension spring to achieve contact-disengagement between the push rod and the toggle plate and the self-resetting of the toggle plate, cutting off the motion transmission between the closing button and the toggle plate, and preventing secondary closing behavior.
It effectively prevents the circuit breaker from being closed again due to the closing button sticking, improves the safety and stability of circuit breaker operation, reduces mechanical shock and wear, and ensures that the closing mechanism returns to its initial state after each operation.
Smart Images
Figure CN122067948A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of ring main unit technology, and more specifically, to a mechanical anti-jump device for a ring main unit mechanism. Background Technology
[0002] As a core protection and control component in medium- and high-voltage power systems, the reliable operation of circuit breakers directly affects the stability of the power grid and the safety of equipment. Among these features, the "anti-pumping" function is a crucial mechanical and electrical characteristic of circuit breakers. It aims to prevent the circuit breaker from experiencing continuous, repetitive abnormal actions of "closing-tripping-reclosing" when it is closed to a fault circuit, due to the protection tripping action followed by the failure to release the closing command (e.g., a stuck closing button, a jammed relay, or continuous issuance of commands). This "pumping" phenomenon can severely damage the mechanical life of the circuit breaker, its contact system, and even the arc-extinguishing chamber, and may lead to the escalation of an accident.
[0003] In existing technologies, electrical anti-pumping circuits are typically used to suppress tripping phenomena, such as adding anti-pumping relays to the closing circuit. However, these electrical anti-pumping schemes rely on the normal operation of the control circuit. If the closing command cannot be released due to mechanical jamming or other reasons, the electrical anti-pumping circuit may fail, and it still cannot fundamentally prevent the circuit breaker from performing secondary closing behavior. Therefore, how to reliably block secondary closing at the mechanical structure level has become a key issue in improving the operational safety and reliability of circuit breakers. Summary of the Invention
[0004] The purpose of this invention is to provide a mechanical anti-jump device for a ring main unit mechanism to solve the problems mentioned in the background art.
[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A mechanical anti-jump device for a ring main unit includes an energy storage mechanism, on which a half-shaft and a trip plate fixed to the half-shaft are connected. When subjected to force, the trip plate can push the half-shaft to rotate, causing the energy storage mechanism to release energy to complete the closing. It also includes a closing mechanism, which includes a mounting plate and a closing button, a push rod and a toggle plate disposed on the mounting plate. When the closing button is pressed by an external force, it drives the push rod to rotate from the beginning to the end of a preset path. During the rotation of the push rod along the preset path, it contacts the toggle plate and pushes the toggle plate to rotate. After the toggle plate rotates, it applies a force to the trip plate, enabling it to push the half shaft to rotate. When the push rod rotates to the end of the preset path, it disengages from the toggle plate to cut off the motion transmission between the closing button and the toggle plate. The mounting plate is equipped with a tension spring to return the lever to its original position, thereby cutting off the motion transmission between it and the trip plate.
[0006] By adopting the above technical solution, during normal closing operation, the closing button can drive the push rod to rotate, which in turn pushes the toggle plate to rotate, and finally pushes the half shaft to rotate through the trip plate to complete the closing. When the push rod rotates to the end of the preset path and disengages from the toggle plate, even if the closing button fails to reset due to jamming or other reasons, the toggle plate can quickly return to its original position under the action of the tension spring and cut off the motion transmission with the trip plate. This fundamentally avoids secondary closing behavior caused by the continuous existence of the closing command, realizes a reliable mechanical anti-pumping function, and significantly improves the safety and stability of circuit breaker operation.
[0007] A further feature is that a first positioning shaft is fixedly mounted on the mounting plate, and a guide hole is provided on the dial plate for the first positioning shaft to extend into. The dial plate can contact the push rod as it returns to the beginning of the preset path, and make clearance movement along the guide hole, thereby allowing the push rod to return to the beginning of the preset path without accidentally triggering the dial plate and the trip plate.
[0008] By adopting the above technical solution, the lever plate can make a yielding movement along the guide hole during the process of the push rod returning to the head end along the preset path, thereby effectively avoiding the problem of jamming or failure to return due to rigid contact between the push rod and the lever plate.
[0009] A further feature is that the push rod and the lever are respectively provided with a first guide surface and a second guide surface at their opposite ends, so as to ensure that the push rod can smoothly return to its original position from the end to the beginning along the preset path.
[0010] By adopting the above technical solution, the push rod and the lever can be smoothly guided during the contact process, reducing mechanical impact and wear, ensuring that the push rod can smoothly push the lever to make a yielding movement during the return process, and finally accurately return to the beginning of the preset path along the preset path.
[0011] A further configuration is as follows: a second positioning shaft is fixedly mounted on the mounting plate, the push rod is rotatably mounted on the second positioning shaft, and a torsion spring connected to the push rod is mounted on the second positioning shaft. Based on the elastic force of the torsion spring, the push rod has a tendency to return to its starting position along a preset path, and the elastic force of the torsion spring is greater than that of the tension spring.
[0012] By adopting the above technical solution, the elastic force of the torsion spring enables the push rod to always maintain the tendency to return to the beginning of the preset path in its natural state; at the same time, the elastic force of the torsion spring is greater than that of the tension spring, which ensures that the resistance of the lever plate can be overcome during the process of the push rod returning to the beginning of the preset path, and the lever plate can be smoothly pushed to give way and complete the return, thereby ensuring that the closing mechanism can reliably return to the initial state after each operation.
[0013] A further configuration is as follows: a button post is fixedly mounted on the mounting plate, and the closing button is mounted on the button post; a guide plate is fixedly mounted on the side of the closing button facing the push rod, the guide plate has an arc-shaped guide surface, and a roller is mounted on one end of the push rod corresponding to the guide plate; when the closing button is pressed by an external force, the arc-shaped guide surface will gradually squeeze the roller, so as to convert the linear motion of the closing button into the rotational motion of the push rod, so that the push rod can rotate from the beginning to the end of the preset path.
[0014] By adopting the above technical solution, the linear motion of the closing button can be smoothly converted into the rotational motion of the push rod through the cooperation of the arc-shaped guide surface and the roller, thereby ensuring that the push rod can rotate from the first end to the last end along the preset path, thus improving the accuracy and response speed of the closing action.
[0015] A further feature is that a first limiting rod is fixedly installed on the mounting plate, which can abut against the push rod to limit the movement.
[0016] By adopting the above technical solution, the push rod can be limited to the beginning of the preset path when it returns to its original position under the action of the torsion spring, thus providing a basis for the next closing operation.
[0017] A further feature is that a second limiting rod is fixedly installed on the mounting plate, which can abut against the lever plate to limit the movement.
[0018] By adopting the above technical solution, the lever can be limited to the initial position when it returns to its original position under the action of the tension spring, thus avoiding excessive return of the lever.
[0019] In summary, the present invention has the following beneficial effects: the push rod is driven to rotate by the closing button, the push rod pushes the lever to rotate, and the trip plate drives the half shaft to rotate to complete the closing. After the push rod rotates to the end of the preset path and disengages from the lever, the lever returns to its original position under the action of the tension spring, thereby cutting off the motion transmission with the trip plate. This reliably blocks the secondary closing behavior caused by the closing button jamming from the mechanical structure level, and effectively prevents the jumping phenomenon. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the push rod rotating to the first end along a preset path in the embodiment. Figure 1 ; Figure 2 for Figure 1 Enlarged view of section A in the middle; Figure 3 This is a schematic diagram of the push rod rotating to the first end along a preset path in the embodiment. Figure 2 ; Figure 4 This is a schematic diagram of the structure when the push rod contacts the dial plate during the rotation of the push rod along the preset path in the embodiment. Figure 5This is a schematic diagram of the push rod rotating to its end along a preset path in the embodiment.
[0021] Reference numerals: 11, half shaft; 12, trip plate; 21, mounting plate; 31, closing button; 32, push rod; 321, first guide surface; 33, toggle plate; 331, second guide surface; 34, tension spring; 41, first positioning shaft; 42, guide hole; 51, second positioning shaft; 52, torsion spring; 61, button post; 62, guide plate; 621, arc-shaped guide surface; 63, roller; 71, first limit rod; 81, second limit rod. Detailed Implementation
[0022] To make the technical means, creative features, achieved objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.
[0023] The present invention will be further described in detail below with reference to the accompanying drawings.
[0024] like Figures 1-5 As shown in the figure, this embodiment discloses a mechanical anti-jump device for a ring main unit, which is mainly applied to the circuit breaker operating mechanism of the ring main unit. The purpose is to prevent the circuit breaker from jumping during a second closing when the closing command cannot be released for some reason.
[0025] Specifically, it includes an energy storage mechanism and a closing mechanism. The energy storage mechanism is the power source for the circuit breaker's opening and closing, and is a conventional structure in the circuit breaker field, belonging to existing technology. The energy storage mechanism is connected to a half-shaft 11 and a trip plate 12 fixedly connected to the half-shaft 11. When subjected to external force, the trip plate 12 can rotate and push the fixed half-shaft 11 to rotate synchronously. The rotation of the half-shaft 11 will trigger the energy release of the energy storage mechanism, thereby driving the circuit breaker to complete the closing action.
[0026] The closing mechanism includes a mounting plate 21 serving as a mounting base, and a closing button 31, a push rod 32, and a toggle plate 33 mounted on the mounting plate 21. A button post 61 is fixedly mounted on the mounting plate 21. The closing button 31 is movably mounted on the button post 61 and can be pressed by external force to move linearly along the axial direction of the button post 61. A guide plate 62 is fixedly mounted on the side of the closing button 31 facing the push rod 32. The guide plate 62 has an arc-shaped guide surface 621. A roller 63 is provided at the end of the push rod 32 opposite to the closing button 31. When the operator presses the closing button 31, the closing button 31 moves inward, and the arc-shaped guide surface 621 on it gradually squeezes the roller 63, thereby converting the linear movement of the closing button 31 into the rotational movement of the push rod 32.
[0027] A second positioning shaft 51 is fixedly installed on the mounting plate 21. The push rod 32 is rotatably mounted on the second positioning shaft 51 and can rotate around the second positioning shaft 51. A torsion spring 52 connected to the push rod 32 is installed on the second positioning shaft 51. In a natural state, the elastic force of the torsion spring 52 will drive the push rod 32 to always have the tendency to move around the second positioning shaft 51 toward the beginning of its preset path. A first limiting rod 71 is also fixedly installed on the mounting plate 21. Under the elastic force of the torsion spring 52, the push rod 32 will abut against the first limiting rod 71, thereby stably limiting the push rod 32 to the beginning of the preset path.
[0028] A first positioning shaft 41 is fixedly mounted on the mounting plate 21, and a guide hole 42 is provided on the lever plate 33. The first positioning shaft 41 passes through the guide hole 42 on the lever plate 33, allowing the lever plate 33 to rotate around the first positioning shaft 41 within a certain range and also to make slight translational movements along the direction of the guide hole 42. A tension spring 34 is also provided on the mounting plate 21. One end of the tension spring 34 is connected to the lever plate 33, and the other end is connected to a fixed shaft on the mounting plate 21. Based on the elastic force of the tension spring 34, the lever plate 33 tends to move away from the trip plate 12, ensuring that the lever plate 33 can be separated from the trip plate 12 in the initial state to avoid accidental activation. In addition, a second limiting rod 81 is also fixedly mounted on the mounting plate 21 to limit the position of the lever plate 33.
[0029] The working process and anti-jump principle of the closing mechanism are as follows: When the energy storage mechanism has completed energy storage (i.e., the mechanism is in the preparatory state for closing), when the operator presses the closing button 31, the arc-shaped guide surface 621 of the guide plate 62 on the closing button 31 gradually presses the roller 63 on the push rod 32. Under the action of the arc-shaped guide surface 621, the linear motion of the closing button 31 is converted into the rotational motion of the push rod 32 around the second positioning axis 51, so that the push rod 32 overcomes the elastic force of the torsion spring 52 and rotates from the beginning to the end of the preset path. During this process, the push rod 32 will contact the lever plate 33 and push the lever plate 33 to rotate. The rotation of the lever plate 33 will directly act on the trip plate 12, pushing the trip plate 12 to rotate. The rotation of the trip plate 12 will drive the half shaft 11 fixed to it to rotate, thereby releasing energy from the energy storage mechanism and realizing closing. When the push rod 32 rotates to the end of the preset path, the push rod 32 and the lever plate 33 completely disengage. At this point, even if the closing button 31 fails to reset due to a malfunction, the push rod 32 is locked at the end of the preset path and cannot directly drive the lever 33. The lever 33, under the tension of the tension spring 34, begins to return to its initial position, rotating back to abutting against the second limit rod 81, thus cutting off the motion transmission between it and the trip plate 12. This means that even if the closing command is not released, the lever 33 that drives the closing action has automatically returned to its original position and cannot trigger the half-shaft 11 again, thus mechanically eliminating the possibility of secondary closing.
[0030] When the jamming problem of the closing button 31 is resolved, or the jammed closing button 31 resets itself due to vibration or other factors, the closing button 31 releases the constraint on the push rod 32. Under the elastic force of the torsion spring 52, the push rod 32 will rotate back from the end of the preset path to the beginning. During the return rotation, the push rod 32 will come into contact with the lever plate 33 in the initial position. If direct rigid interference occurs between the two, the push rod 32 will not be able to return to its original position. To solve this problem, this embodiment utilizes the guide hole 42 on the lever plate 33 and the difference in elastic force between the torsion spring 52 and the tension spring 34. Since the elastic force of the torsion spring 52 is greater than that of the tension spring 34, when the push rod 32 in the return position presses against the lever plate 33, the lever plate 33 will make way using the guide hole 42 as its path, allowing the push rod 32 to pass smoothly. Once push rod 32 passes through and abuts against the first limit rod 71 to complete its return to its original position, the lever 33 moves in the opposite direction along the guide hole 42 under the tension of the tension spring 34, eventually returning to the second limit rod 81. At this point, the entire closing mechanism has completely returned to its initial state, awaiting the next closing operation.
[0031] Furthermore, the push rod 32 and the lever 33 are respectively provided with a first guide surface 321 and a second guide surface 331 at their opposite ends. In this embodiment, the first guide surface 321 is an inclined surface and the second guide surface 331 is an arc-shaped guide surface 621. Through the cooperation of the first guide surface 321 and the second guide surface 331, the contact between the push rod 32 and the lever 33 can be made smoother, and the push rod 32 can be rotated back to the beginning along the preset path to achieve return to position.
[0032] The improvement of this application lies in achieving a mechanical anti-jump function through the contact-disengagement engagement between the push rod 32 and the lever 33 and the self-resetting structure of the lever 33: after the closing button 31 is pressed, the push rod 32 rotates along a preset path and pushes the lever 33, thereby driving the trip plate 12 to rotate the half shaft 11 to complete the closing; when the push rod 32 rotates to the end of the path, it disengages from the lever 33, cutting off the motion transmission between the closing button 31 and the lever 33. Subsequently, the lever 33 automatically returns to its original position under the action of the tension spring 34, further cutting off its motion transmission with the trip plate 12, thereby preventing the occurrence of secondary closing behavior from the mechanical structure when the closing button 31 is stuck or the closing command continues to exist. This application does not aim to improve the specific structural form of the energy storage mechanism, the connection method between the half-shaft 11 and the trip plate 12, the installation method of the closing button 31, or the driving form of the push rod 32 (such as the cooperation between the arc-shaped guide surface and the roller), nor does it aim to optimize the spring parameters, material selection, or installation layout. Therefore, the above contents are not specifically described. The structures of the energy storage mechanism and other units of the ring main unit are all prior art, and this application does not describe them in detail. Their specific structures can be referred to relevant prior art.
[0033] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.
Claims
1. A mechanical anti-jump device for a ring main unit, comprising an energy storage mechanism, characterized in that: The energy storage mechanism is connected to a half shaft (11) and a trip plate (12) fixed to the half shaft (11). When the trip plate (12) is subjected to force, it can push the half shaft (11) to rotate, so that the energy storage mechanism releases energy to complete the closing. It also includes a closing mechanism, which includes a mounting plate (21) and a closing button (31), a push rod (32) and a toggle plate (33) set on the mounting plate (21). When the closing button (31) is pressed by an external force, it will drive the push rod (32) to rotate from the beginning to the end of the preset path. During the rotation of the push rod (32) along the preset path, it will contact the dial plate (33) and push the dial plate (33) to rotate. After the dial plate (33) rotates, it will apply a force to the trip plate (12) so that it can push the half shaft (11) to rotate. When the push rod (32) rotates to the end of the preset path, it will disengage from the dial plate (33) to cut off the motion transmission between the closing button (31) and the dial plate (33). The mounting plate (21) is provided with a tension spring (34) to return the lever (33) to its original position, thereby cutting off the motion transmission between it and the trip plate (12).
2. The mechanical anti-jump device for a ring main unit according to claim 1, characterized in that: The mounting plate (21) is fixedly provided with a first positioning shaft (41), and the lever plate (33) is provided with a guide hole (42) for the first positioning shaft (41) to extend into. The lever plate (33) can contact the push rod (32) during the process of returning to the head end along the preset path, and make clearance movement with the guide hole (42) as the path, thereby allowing the push rod (32) to return to the head end along the preset path without pushing the lever plate (33) and the trip plate (12) to be accidentally triggered.
3. The mechanical anti-jump device for a ring main unit according to claim 1, characterized in that: The push rod (32) and the lever (33) are respectively provided with a first guide surface (321) and a second guide surface (331) at opposite ends to ensure that the push rod (32) can smoothly return to the beginning along the end of the preset path.
4. The mechanical anti-jump device for a ring main unit according to claim 1, characterized in that: A second positioning shaft (51) is fixedly provided on the mounting plate (21). The push rod (32) is rotatably provided on the second positioning shaft (51). A torsion spring (52) connected to the push rod (32) is provided on the second positioning shaft (51). Based on the elastic force of the torsion spring (52), the push rod (32) has a tendency to return to the head end along the preset path. The elastic force of the torsion spring (52) is greater than the elastic force of the tension spring (34).
5. The mechanical anti-jump device for a ring main unit according to claim 1, characterized in that: A button post (61) is fixedly installed on the mounting plate (21), and the closing button (31) is installed on the button post (61). A guide plate (62) is fixedly installed on the side of the closing button (31) facing the push rod (32). The guide plate (62) has an arc-shaped guide surface (621). A roller (63) is installed on one end of the push rod (32) corresponding to the guide plate (62). When the closing button (31) is pressed by an external force, the arc-shaped guide surface (621) will gradually squeeze the roller (63) to convert the linear motion of the closing button (31) into the rotational motion of the push rod (32), so that the push rod (32) can rotate from the beginning to the end along the preset path.
6. The mechanical anti-jump device for a ring main unit according to claim 1, characterized in that: The mounting plate (21) is fixedly provided with a first limiting rod (71) that can abut against the push rod (32) to limit the movement.
7. The mechanical anti-jump device for a ring main unit according to claim 1, characterized in that: A second limiting rod (81) is fixedly provided on the mounting plate (21) to abut against the lever plate (33) for limiting.