Three-phase linkage transmission device of high-voltage vacuum circuit breaker

Abstract

This utility model discloses a three-phase linkage transmission device for a high-voltage vacuum circuit breaker, including an operating mechanism and three transmission modules. Each transmission module includes a frame, a rotating shaft, a connecting rod, and a connecting rod. The top of the frame is fixed to the cover plate of the corresponding operating mechanism chamber, and the rotating shaft is mounted on the frame. The connecting rod is fixed to the middle of the rotating shaft and includes a first crank arm and a second crank arm. The lower end of the connecting rod is hinged to the outer end of the first crank arm, and the upper end of the connecting rod is hinged to the lower end of the high-voltage vacuum circuit breaker operating lever. The second crank arm of the first transmission module is connected to the second crank arm of the second transmission module via a second connecting rod. The second crank arm of the second transmission module is connected to the second crank arm of the third transmission module via a third connecting rod. The rocker arm on the rotating shaft of the first transmission module is connected to the operating mechanism via a first connecting rod. This utility model directly adapts to the driving requirements of opening and closing of a direct-acting high-voltage vacuum circuit breaker, improving the adaptability of the transmission.

Description

Technical Field

[0001] This utility model relates to high-voltage vacuum circuit breakers, and more particularly to a three-phase linkage transmission device for high-voltage vacuum circuit breakers. Background Technology

[0002] Previously, high-voltage switchgear used SF6 circuit breakers for interruption, with direct-insertion contacts. SF6 circuit breakers have strong arc-extinguishing capabilities, quickly extinguishing the arc upon contact disconnection, and the operating mechanism has little impact on motion characteristics. Modern circuit breakers, however, operate under vacuum interruption, requiring operating mechanisms compatible with vacuum interruption. The operating mechanism is the actuating element of the circuit breaker; it, along with the electrical components, undertakes the closing and opening operations of the circuit breaker. Simultaneously, it needs to coordinate with the motion characteristics of the electrical components to ensure reliable system fault isolation.

[0003] The invention disclosed in application number 201510368159.3 is a three-phase linkage transmission device for a high-voltage switch, including an operating mechanism, a spatial linkage mechanism, two planar linkage mechanisms, and a three-phase switch input shaft. The operating mechanism's output shaft and the first-phase switch input shaft near the operating mechanism are connected by a spatial linkage mechanism. The three-phase switch input shafts arranged in the same plane are connected by two identical but independent planar linkage mechanisms. This invention, by employing a spatial four-bar linkage, solves the problem of motion transmission when the mechanism's output shaft and the switch input shaft can be in spatial positions. When designing a high-voltage switch, it provides more options for the direction of the mechanism's output shaft and the high-voltage switch's input shaft, improving the mechanism's versatility, reducing the development cycle of high-voltage switch products, and lowering costs.

[0004] However, in the field of high-voltage switchgear, the typical structure of a direct-acting high-voltage vacuum circuit breaker includes three independent operating mechanism compartments. Each operating mechanism compartment is generally equipped with a cover plate and a drive operating rod capable of vertical linear movement. This drive operating rod passes through the cover plate and extends to the operating mechanism compartment at its top to transmit power. The three-phase linkage transmission device for high-voltage switches disclosed in application number CN201510368159.3, although capable of solving the motion transmission problem when the output rotating shaft of the operating mechanism and the input rotating shaft of the switch are not arranged parallel in space, has a transmission chain where both the starting and ending points are in a rotary motion form. This makes it impossible to directly adapt to the linear motion drive operating rod of the aforementioned direct-acting high-voltage vacuum circuit breaker, hindering its efficient provision of power for the opening and closing of the direct-acting high-voltage vacuum circuit breaker and limiting its application in direct-acting high-voltage vacuum circuit breakers. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a three-phase linkage transmission device that is easy to drive a direct-acting high-voltage vacuum circuit breaker, so as to adapt to the driving requirements of the direct-acting high-voltage vacuum circuit breaker and improve the adaptability and efficiency of the transmission.

[0006] The technical problem to be further solved by this utility model is to provide a three-phase linkage transmission device for a high-voltage vacuum circuit breaker that can appropriately reduce the opening speed at the end of the opening stage and avoid overshoot during opening.

[0007] The further technical problem to be solved by this utility model is to provide a three-phase linkage transmission device for a high-voltage vacuum circuit breaker that can reduce the deformation of the drive operating rod caused by lateral force.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is a three-phase linkage transmission device for a high-voltage vacuum circuit breaker, including an operating mechanism and three transmission modules. The first transmission module is connected to the operating mechanism via a first connecting rod, the second transmission module is connected to the first transmission module via a second connecting rod, and the third transmission module is connected to the second transmission module via a third connecting rod. The high-voltage vacuum circuit breaker includes three operating mechanism chambers arranged along the X-axis. Each operating mechanism chamber includes a cover plate and a drive operating rod. The drive operating rod passes through the cover plate of the operating mechanism chamber and its top end enters the operating mechanism chamber. Each transmission module includes a frame, a rotating shaft, a connecting rod crank arm, and a connecting rod. The top of the frame is fixed to... On the cover plate corresponding to the operating mechanism chamber, a rotating shaft is mounted on the frame along the Y-axis direction; a connecting rod crank arm is fixed in the middle of the rotating shaft, including a first crank arm and a second crank arm, the lower end of the connecting rod is hinged to the outer end of the first crank arm, and the upper end of the connecting rod is hinged to the lower end of the drive operating lever; the second crank arm of the first transmission module is hinged to the first end of the second connecting rod, and the second end of the second connecting rod is hinged to the second crank arm of the second transmission module; the second crank arm of the second transmission module is hinged to the first end of the third connecting rod, and the second end of the third connecting rod is hinged to the second crank arm of the third transmission module; the first transmission module includes a rocker arm, the inner end of which is fixed on the rotating shaft of the first transmission module, and the outer end of which is hinged to the first connecting rod.

[0009] The three-phase linkage transmission device described above includes a main buffer cam and a main buffer cylinder in its transmission module. The main buffer cam is fixed on the rotating shaft, and the main buffer cylinder is fixed on the frame. The piston rod of the main buffer cylinder faces the main buffer cam.

[0010] The three-phase linkage transmission device described above includes at least one transmission module comprising a secondary buffer cam and a secondary buffer cylinder. The secondary buffer cam is fixed on the rotating shaft, and the secondary buffer cylinder is fixed on the frame. The piston rod of the secondary buffer cylinder faces the secondary buffer cam.

[0011] The three-phase linkage transmission device described above includes a transmission module comprising a guide plate, which is fixed on the frame and includes a guide hole; the drive operating rod passes through the guide hole and slides in cooperation with the guide hole.

[0012] The three-phase linkage transmission device described above includes a frame, a front support plate for the rotating shaft, and a rear support plate for the rotating shaft. The frame includes an upper rectangular frame and a lower rectangular frame, which are connected by four uprights. The front support plate for the rotating shaft is fixed to two uprights at the front of the frame, and the rear support plate for the rotating shaft is fixed to two uprights at the rear of the frame. The front of the rotating shaft is supported by a bearing on the front support plate, and the rear of the rotating shaft is supported by a bearing on the rear support plate. The rear journal of the rotating shaft of the first transmission module extends rearward through the bearing on the rear support plate, and the inner end of the rocker arm is fixed to the rear journal of the rotating shaft of the first transmission module.

[0013] The three-phase linkage transmission device described above includes a main buffer cam with rollers, a main buffer cylinder arranged below the rollers of the main buffer cam, and the bottom of the main buffer cylinder fixed to the lower rectangular frame of the frame by a mounting plate. The piston rod of the main buffer cylinder faces the rollers of the main buffer cam.

[0014] The three-phase linkage transmission device described above includes a secondary buffer cam and a secondary buffer cylinder in the second and third transmission modules, respectively. The front journal of the rotating shaft of the second and third transmission modules extends forward through the bearing on the front support plate of the corresponding rotating shaft. The inner end of the secondary buffer cam is fixed on the front journal of the rotating shaft. The frame of the second and third transmission modules includes a secondary buffer cylinder bracket, with the secondary buffer cylinder fixed on the corresponding secondary buffer cylinder bracket and the secondary buffer cylinder bracket fixed on the front end face of the corresponding frame.

[0015] The three-phase linkage transmission device described above includes a transmission module comprising a front guide bracket and a rear guide bracket. The front guide bracket comprises a front upright plate and a front guide plate, and the rear guide bracket comprises a rear upright plate and a rear guide plate. The front guide plate is fixed inside the front upright plate, and its inner end includes a front guide groove. The rear guide plate is fixed inside the rear upright plate, and its inner end includes a rear guide groove. The front upright plate is fixed to the front end face of the frame, and the rear upright plate is fixed to the rear end face of the frame. The front guide groove and the rear guide groove are opposite to each other and are combined to form an integral guide hole. The lower end of the drive operating rod includes a connecting fork, which passes through the integral guide hole and slides in cooperation with it. The lower end of the connecting fork is hinged to the upper end of the connecting rod.

[0016] The operating mechanism of the three-phase linkage transmission device described above is a double oil buffer spring operating mechanism.

[0017] The three-phase linkage transmission device of this invention can be directly adapted to the driving requirements of opening and closing of direct-acting high-voltage vacuum circuit breakers, thus improving the adaptability of the transmission. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a front view of the high-voltage vacuum circuit breaker according to an embodiment of the present invention.

[0020] Figure 2 This is a perspective view of a high-voltage vacuum circuit breaker according to an embodiment of this utility model.

[0021] Figure 3 This is a perspective view of the high-voltage vacuum circuit breaker according to another embodiment of the present invention.

[0022] Figure 4 This is a perspective view of the main body of the high-voltage vacuum circuit breaker according to an embodiment of this utility model.

[0023] Figure 5 This is a front view of the three-phase linkage transmission device according to an embodiment of this utility model.

[0024] Figure 6 This is a top view of the three-phase linkage transmission device according to an embodiment of this utility model.

[0025] Figure 7 This is a perspective view of the three-phase linkage transmission device according to an embodiment of this utility model.

[0026] Figure 8 This is a perspective view of the three-phase linkage transmission device according to an embodiment of this utility model.

[0027] Figure 9 This is a front view of the first transmission module in an embodiment of this utility model.

[0028] Figure 10 This is a top view of the first transmission module of this utility model embodiment.

[0029] Figure 11 This is a right view of the first transmission module of this utility model embodiment.

[0030] Figure 12 This is a rear view of the first transmission module in an embodiment of this utility model.

[0031] Figure 13 yes Figure 9 AA section view in the image.

[0032] Figure 14 yes Figure 11 BB section view in the middle.

[0033] Figure 15 This is a front view of the second transmission module in an embodiment of this utility model.

[0034] Figure 16 This is a top view of the second transmission module in an embodiment of this utility model.

[0035] Figure 17This is a right view of the second transmission module of this utility model embodiment.

[0036] Figure 18 yes Figure 17 DD section view in the image.

[0037] Figure 19 yes Figure 15 CC section view in the image.

[0038] Figure 20 This is a perspective view of the third transmission module in an embodiment of this utility model.

[0039] Figure 21 This is a front view of the third transmission module in this embodiment of the utility model.

[0040] Figure 22 This is a cross-sectional view of the third transmission module in an embodiment of this utility model.

[0041] Figure 23 This is an exploded view of the connecting rod crank arm according to an embodiment of this utility model.

[0042] Figure 24 This is a perspective view of the rotating shaft assembly according to an embodiment of the present invention.

[0043] Figure 25 This is an exploded view of the guide plate of an embodiment of this utility model.

[0044] Figure 26 This is a perspective view of the main buffer cylinder mounting plate according to an embodiment of this utility model. Detailed Implementation

[0045] The structure of the three-phase linkage transmission device of the high-voltage vacuum circuit breaker in this embodiment of the utility model is as follows: Figures 1 to 26 As shown, the high-voltage vacuum circuit breaker body 10 includes a double oil buffer spring operating mechanism 20 and three transmission modules 30. It comprises three operating mechanism chambers 11 arranged along the X-axis. Each operating mechanism chamber 11 includes a lower cover plate 12 and a vertically arranged drive operating lever 13. The drive operating lever 13 passes through the lower cover plate 12 of the operating mechanism chamber 11, with its top end entering the operating mechanism chamber 11.

[0046] The first (A-phase) transmission module 30A is connected to the double oil buffer spring operating mechanism 20 via the first link 41, the second (B-phase) transmission module 30B is connected to the first (A-phase) transmission module 30A via the second link 42, and the third (C-phase) transmission module 30C is connected to the second (B-phase) transmission module 30B via the third link 43.

[0047] The transmission module 30 includes a frame 40, a rotating shaft 31, a connecting rod crank arm 32, a connecting rod 33, a guide plate 34, a main buffer cam 35, and a main buffer cylinder 36.

[0048] The frame 40 is a frame structure, consisting of a front support plate 311 for the rotating shaft and a rear support plate 312 for the rotating shaft. The frame includes an upper rectangular frame 40B and a lower rectangular frame 40C, which are connected by four uprights 40A. The upper rectangular frame 40B at the top of the frame 40 is fixed to the lower cover plate 12 of the corresponding operating mechanism chamber 11 by multiple screws. The lower end of the drive operating lever 13 extends into the corresponding frame structure frame 40. The rotating shaft 31, the front support plate 311, and the rear support plate 312 constitute the rotating shaft assembly. The front support plate 311 is fixed to the two uprights 40A at the front of the frame, and the rear support plate 312 is fixed to the two uprights 40A at the rear of the frame. The front of the rotating shaft 31 is supported by a bearing on the front support plate 311, and the rear of the rotating shaft 31 is supported by a bearing on the rear support plate 312. The rotating shaft 31 is arranged along the Y-axis direction.

[0049] The connecting rod crank arm 32 is fixed to the middle of the rotating shaft 31, and includes a first crank arm 321 and a second crank arm 322. The lower part of the drive operating lever 13 has a rectangular cross-section connecting fork 131, the lower end of the connecting fork 131 is hinged to the upper end of the connecting rod 33, and the lower end of the connecting rod 33 is hinged to the outer end of the first crank arm 321.

[0050] The second crank arm 322 of the first (A-phase) transmission module 30A is hinged to the first end of the second connecting rod 42. The second end of the second connecting rod 42 is hinged to the second crank arm 322 of the second (B-phase) transmission module 30B. The second crank arm 322 of the second (B-phase) transmission module 30B is hinged to the first end of the third connecting rod 43. The second end of the third connecting rod 43 is hinged to the second crank arm 322 of the third (C-phase) transmission module 30C. The rocker arm 37 of the first (A-phase) transmission module 30A has its inner end fixed to the rotating shaft 31 of the first (A-phase) transmission module 30A, and its outer end hinged to the first connecting rod 41.

[0051] The main buffer cam 35 is fixed on the rotating shaft 31. There is a roller 351 on the main buffer cam 35. The main buffer cylinder 36 is arranged below the roller of the main buffer cam 35. The bottom of the main buffer cylinder 36 is fixed to the lower rectangular frame 40C of the frame through the mounting plate 361. The piston rod of the main buffer cylinder 36 faces the roller 351 of the main buffer cam 35.

[0052] The rear journal 313 of the rotating shaft 31 of the first (A phase) transmission module 30A extends rearward through the bearing on the rear support plate 312 of the rotating shaft, and the inner end of the rocker arm 37 is fixed on the rear journal 313 of the rotating shaft 31 of the first (A phase) transmission module 30A.

[0053] The second (B-phase) transmission module 30B and the third (C-phase) transmission module 30C each include a secondary buffer cam 38 and a secondary buffer cylinder 39. The front journal 314 of the rotating shaft 31 of the second (B-phase) transmission module 30B and the third (C-phase) transmission module 30C extends forward through the bearing on the corresponding front support plate 311 of the rotating shaft. The inner end of the secondary buffer cam 38 is fixed on the front journal 314 of the rotating shaft 31. The frame 40 of the second (B-phase) transmission module 30B and the third (C-phase) transmission module 30C each include a bracket for the secondary buffer cylinder. The secondary buffer cylinder 39 is fixed on the bracket of the corresponding secondary buffer cylinder, and the bracket of the secondary buffer cylinder is fixed on the front end face of the corresponding frame.

[0054] The guide plate 34 includes a front guide bracket 34A and a rear guide bracket 34B. The front guide bracket 34A includes a front upright plate 341 and a front guide plate 342, and the rear guide bracket 34B includes a rear upright plate 343 and a rear guide plate 344. The front guide plate 342 is fixed inside the front upright plate 341, and its inner end includes a front guide groove 345. The rear guide plate 344 is fixed inside the rear upright plate 343, and its inner end includes a rear guide groove 346. The front upright plate 341 is fixed to the front end face of the frame, and the rear upright plate 343 is fixed to the rear end face of the frame. The front guide groove 345 and the rear guide groove 346 are opposite to each other and combine to form an integral, rectangular guide hole for the drive operating rod. The connecting fork 131 with a rectangular cross-section at the lower part of the drive operating rod 13 passes through the integral guide hole and slides in cooperation with the guide hole of the drive operating rod.

[0055] The three-phase linkage transmission device of the high-voltage vacuum circuit breaker in the above embodiments of this utility model mainly relates to a transmission buffer and guiding structure for the operating mechanism of a high-voltage vacuum circuit breaker. The three-phase linkage transmission device of the high-voltage vacuum circuit breaker in the above embodiments of this utility model adds multi-stage oil buffering, allowing the mechanism's handling characteristics to match the reaction force characteristics of the arc-extinguishing chamber, and adjusting the opening and closing speeds to suit the requirements of the high-voltage vacuum environmentally friendly circuit breaker. The ideal motion characteristics of a vacuum circuit breaker reflect the different speed requirements at different contact positions, that is, the coordination between the mechanism's output force characteristics and the reaction force characteristics of the arc-extinguishing chamber.

[0056] The closing speed of a high-voltage vacuum circuit breaker is divided into initial closing speed and rigid closing speed. Initial closing speed generally refers to the average speed in the first 3-6 mm of closing, characterizing the mechanism's reaction time. Rigid closing speed is defined as the average speed of the contacts within a fixed distance before contact. For high-voltage vacuum circuit breakers, if a short-circuit fault occurs in the power grid, the short-circuit current may reach hundreds of kiloamperes. At this time, the electro-repulsive force between the contacts will be enormous, potentially hindering the effective closing of the switch contacts. Therefore, the operating mechanism must be able to provide sufficient output force or torque to overcome the electro-repulsive force of the contacts. The impulse provided by the rigid closing speed of the operating mechanism must not only overcome the reaction force of the overtravel spring but also overcome the harmful electro-repulsive force of the contacts. The closing speed of high-voltage circuit breakers is generally between 1.1-2.5 m / s. For high-voltage applications, pre-breakdown may occur before the contacts close. A suitable rigid closing speed helps reduce the arcing time of the pre-breakdown arc and prevents erosion from welding and short-gap arcs. Excessive stiffness and speed are harmful. The constraint on the closing speed is the huge impact force at the moment of closing, which causes the contacts to collide violently. On the one hand, it may damage the contacts, and on the other hand, it will cause harmful rebound, thus forming a high-frequency arc. This causes the contact surface to melt due to the arc, and finally causes the contacts to weld in the closed position.

[0057] The opening process of a vacuum circuit breaker consists of two stages: initial opening and final opening. The opening distance of a high-voltage vacuum circuit breaker is approximately 45-60mm. Its initial opening speed generally refers to the average opening speed within the first 3-4mm of contact separation. For high-voltage vacuum environmental protection circuit breakers, the average speed within 0-20mm must be no less than 3.5m / s. During this process, because the operating mechanism needs to first exit the overtravel, the speed is already relatively high when the opening distance reaches 15mm. On the one hand, a higher initial opening speed helps the contacts reach the critical opening distance for arc extinguishing as quickly as possible, thereby effectively reducing the arcing time and maximizing the chance of arc extinguishing. On the other hand, for the relatively fast opening speed in the early stage of the stroke, buffer control needs to be adopted as early as possible in the final stage of the stroke to avoid harmful overshoot and rebound.

[0058] Furthermore, all three transmission modules in the above embodiments of this utility model provide a guide mechanism for the drive operating lever. When the linkage crank arm pushes the drive operating lever to make a linear up-and-down movement, a lateral force is generated. If the lateral force is too large at the moment the crank arm exerts force, it will cause the drive operating lever to deform in the X-axis direction, affecting the movement speed. The guide mechanism can effectively prevent the drive operating lever from deforming due to lateral force during movement, ensuring the closing speed and transmission reliability.

[0059] The guide plate 34, which serves as the guiding mechanism, includes a front guide bracket 34A and a rear guide bracket 34B. The front guide bracket 34A and the rear guide bracket 34B have observation holes 347, which can be used to observe the movement of the main drive rod. The rectangular slot in the middle of the guide plate 34 is perfectly matched with the lower rectangular cross-section of the drive operating rod 13. When the drive operating rod 13 moves up and down, it can effectively move within the square slot formed by the guide plate 34, avoiding deformation due to large impact lateral forces, which would affect the quality of movement and effectively ensure the reliability of movement.

[0060] At high voltage levels, the contact pressure of the vacuum interrupter is high, exceeding 7000N for a single interrupter. This increases the closing energy requirement; the higher the contact pressure, the greater the work required to overcome the contact spring reaction force during closing, necessitating a higher energy reserve from the spring mechanism. The closing energy requirement is E∝F×d (FF is the contact pressure, dd is the overtravel). Simultaneously, the opening speed requirement is higher. High-voltage interrupters need to open rapidly to suppress the arc. High contact pressure increases the initial resistance during opening, requiring the spring mechanism to provide a greater initial burst force. A speed exceeding 3.5m / s is generally considered suitable. Under these ultra-high energy and ultra-high speed conditions, strong impacts and rebounds occur during opening and closing, potentially leading to repeated opening and closing of the moving and stationary contacts, resulting in functional operation failures, severe contact burn-out, and unstable circuit breaker opening and closing speeds due to voltage variations and vibrations.

[0061] The spring operating mechanism of the present invention in the above embodiments can adopt the double oil buffer spring operating mechanism disclosed in publication number CN206893529U, entitled "Double oil buffer structure for opening of spring operating mechanism of high voltage vacuum circuit breaker".

[0062] In the three transmission modules 30 of the above embodiments of this utility model, the differences between the first (A phase) transmission module 30A and the second (B phase) transmission module 30B and the third (C phase) transmission module 30C are as follows: Firstly, the first (A-phase) transmission module 30A serves as the connecting mechanism, transmitting the kinetic energy of the mechanism; Secondly, the second (B-phase) transmission module 30B and the third (C-phase) transmission module 30C have added a transmission module auxiliary oil buffer compared to the first (A-phase) transmission module 30A, in order to better achieve the required functions.

[0063] The upper rectangular frame 40B at the top of the frame 40 of the first (A phase) transmission module 30A is fixed to the lower cover plate 12 of the corresponding operating mechanism chamber 11 by multiple screws. The rocker arm 37 is connected to the output end of the spring operating mechanism through the first connecting rod 41 to obtain kinetic energy. The rocker arm 37 is connected to the rotating shaft 31, driving the rotating shaft 31 to move. The main buffer cam 35 and the connecting rod crank arm 32 connected to the rotating shaft 31 move accordingly. The first crank arm 321 of the connecting rod crank arm 32 drives the drive operating rod 13 of the moving end of the arc-extinguishing chamber inside the high-voltage vacuum circuit breaker body to move up and down through the connecting rod 33, realizing the opening and closing of the circuit breaker A phase.

[0064] The second (B-phase) transmission module 30B and the third (C-phase) transmission module 30C are the same as the first (A-phase) transmission module 30A. The upper rectangular frame 40B on the top of the frame 40 is fixed to the lower cover plate 12 of the corresponding operating mechanism chamber 11 by multiple screws. The second crank arm 322 of the second (B-phase) transmission module 30B is connected to the second crank arm 322 of the first (A-phase) transmission module 30A through the second connecting rod 42. The second crank arm 322 of the third (C-phase) transmission module 30C is connected to the second crank arm 322 of the second (B-phase) transmission module 30B through the third connecting rod 43 to obtain kinetic energy, thereby driving the rotation shaft 31 of the second (B-phase) transmission module 30B and the third (C-phase) transmission module 30C to move. The driving principle of the up-and-down movement / opening and closing of the drive operating lever 13 of the second (B-phase) transmission module 30B and the third (C-phase) transmission module 30C is the same as that of the first (A-phase) transmission module 30A.

[0065] To achieve the required mechanical characteristic parameters of the vacuum circuit breaker, the three-phase linkage transmission device of the high-voltage vacuum circuit breaker in the above embodiments of this utility model is designed with a transmission module oil buffer structure. During the opening process, the cam contacts the oil buffer, and the buffer begins to function. The transmission module structure of the three-phase linkage transmission device has main and auxiliary oil buffers. The main oil buffer is fixed to the frame by an oil buffer mounting plate, and the auxiliary oil buffer is fixed to the side of the frame by an auxiliary buffer bracket. The main oil buffer plays a leading buffering role during the circuit breaker opening process (when the moving contact approaches the end of its stroke). It absorbs the remaining kinetic energy of the moving contact system through the damping effect of the oil, preventing mechanical parts (such as connecting rods, crank arms, etc.) from being damaged by rigid collisions. The auxiliary oil buffer, as a supplement to the main buffer, enhances the reliability of the system and provides auxiliary buffering at the end of the opening process, suppressing the overshoot and vibration of the mechanism crank arm during opening. When the mechanism opens or closes, the rotating shaft 31 drives the cam to move. At the end of the opening process, the cam contacts the auxiliary oil buffer on the mechanism body, and the buffering is achieved through spring damping.

[0066] The structure of the main and auxiliary oil buffers of the three-phase linkage transmission device of the high-voltage vacuum circuit breaker in the above embodiments of this utility model is mainly for 252kV vacuum circuit breakers, which have very high energy requirements for the spring mechanism, exceeding 5kJ. The spring releases a large amount of energy, which must be absorbed in a very short time. Spring buffers alone are insufficient, so a hydraulic oil buffer is added as the primary buffer. During the opening process, the spring releases excess energy, which the oil buffer absorbs through internal hydraulic resistance, preventing rebound or oscillation and ensuring the contacts reach their destination quickly and stably. During vacuum arc-extinguishing, the first stage requires a high speed, while the second stage requires a slower speed. A fast first stage ensures the contacts quickly cross the zero point and open effectively. A slower second stage is necessary because the arc-extinguishing chamber has a large opening distance; if the second stage speed is as fast as the first, the arc will spread uncontrollably around the arc-extinguishing chamber, easily leading to opening failure. Since the main oil buffer alone cannot fully achieve this function, a secondary oil buffer is added. This secondary buffer is relatively small and mainly plays an auxiliary role in reducing the second-stage opening speed. The secondary oil buffer is designed with a threaded installation mode, and the secondary buffer bracket has threaded holes, allowing for flexible adjustment of the buffer connection degree according to test characteristics. This effectively ensures the performance requirements of the opening speed and facilitates debugging.

Claims

1. A three-phase linkage transmission device for a high-voltage vacuum circuit breaker, comprising an operating mechanism and three transmission modules, wherein a first transmission module is connected to the operating mechanism via a first connecting rod, a second transmission module is connected to the first transmission module via a second connecting rod, and a third transmission module is connected to the second transmission module via a third connecting rod; characterized in that, The high-voltage vacuum circuit breaker includes three operating mechanism chambers arranged along the X-axis. Each operating mechanism chamber includes a cover plate and a drive operating lever. The drive operating lever passes through the cover plate of the operating mechanism chamber and its top end enters the operating mechanism chamber. The transmission module includes a frame, a rotating shaft, a connecting rod, and a connecting rod. The top of the frame is fixed to the cover plate of the corresponding operating mechanism chamber. The rotating shaft is mounted on the frame along the Y-axis. The connecting rod is fixed to the middle of the rotating shaft and includes a first crank arm and a second crank arm. The lower end of the connecting rod is hinged to the outer end of the first crank arm, and the upper end of the connecting rod is hinged to the lower end of the drive operating lever. The second crank arm of the first transmission module is hinged to the first end of the second connecting rod, and the second end of the second connecting rod is hinged to the second crank arm of the second transmission module. The second crank arm of the second transmission module is hinged to the first end of the third connecting rod, and the second end of the third connecting rod is hinged to the second crank arm of the third transmission module. The first transmission module includes a rocker arm. The inner end of the rocker arm is fixed to the rotating shaft of the first transmission module, and the outer end of the rocker arm is hinged to the first connecting rod.

2. The three-phase linkage transmission device according to claim 1, characterized in that, The transmission module includes a main buffer cam and a main buffer cylinder. The main buffer cam is fixed on the rotating shaft, and the main buffer cylinder is fixed on the frame. The piston rod of the main buffer cylinder faces the main buffer cam.

3. The three-phase linkage transmission device according to claim 2, characterized in that, At least one transmission module includes a secondary buffer cam and a secondary buffer cylinder. The secondary buffer cam is fixed on a rotating shaft, and the secondary buffer cylinder is fixed on a frame. The piston rod of the secondary buffer cylinder faces the secondary buffer cam.

4. The three-phase linkage transmission device according to claim 1, characterized in that, The transmission module includes a guide plate, which is fixed on the frame and includes a guide hole; the drive operating rod passes through the guide hole and slides in cooperation with the guide hole.

5. The three-phase linkage transmission device according to claim 3, characterized in that, The frame includes a frame, a front support plate for the rotating shaft, and a rear support plate for the rotating shaft. The frame includes an upper rectangular frame and a lower rectangular frame, which are connected by four uprights. The front support plate for the rotating shaft is fixed to two uprights at the front of the frame, and the rear support plate for the rotating shaft is fixed to two uprights at the rear of the frame. The front of the rotating shaft is supported by a bearing on the front support plate, and the rear of the rotating shaft is supported by a bearing on the rear support plate. The rear journal of the rotating shaft of the first transmission module extends rearward through the bearing on the rear support plate, and the inner end of the rocker arm is fixed to the rear journal of the rotating shaft of the first transmission module.

6. The three-phase linkage transmission device according to claim 5, characterized in that, The main buffer cam includes a roller, and the main buffer cylinder is arranged below the roller of the main buffer cam. The bottom of the main buffer cylinder is fixed to the lower rectangular frame of the frame by a mounting plate, and the piston rod of the main buffer cylinder faces the roller of the main buffer cam.

7. The three-phase linkage transmission device according to claim 5, characterized in that, The second and third transmission modules each include the aforementioned auxiliary buffer cam and auxiliary buffer cylinder. The front journal of the rotating shaft of the second and third transmission modules extends forward through the bearing on the corresponding front support plate of the rotating shaft. The inner end of the auxiliary buffer cam is fixed on the front journal of the rotating shaft. The frame of the second and third transmission modules each includes an auxiliary buffer cylinder bracket. The auxiliary buffer cylinder is fixed on the corresponding auxiliary buffer cylinder bracket, and the auxiliary buffer cylinder bracket is fixed on the front end face of the corresponding frame.

8. The three-phase linkage transmission device according to claim 1, characterized in that, The transmission module includes a front guide bracket and a rear guide bracket. The front guide bracket includes a front upright plate and a front guide plate, and the rear guide bracket includes a rear upright plate and a rear guide plate. The front guide plate is fixed inside the front upright plate, and its inner end includes a front guide groove. The rear guide plate is fixed inside the rear upright plate, and its inner end includes a rear guide groove. The front upright plate is fixed to the front end face of the frame, and the rear upright plate is fixed to the rear end face of the frame. The front guide groove and the rear guide groove are opposite to each other and combine to form an integral guide hole. The lower end of the drive operating rod includes a connecting fork, which passes through the integral guide hole and slides in cooperation with it. The lower end of the connecting fork is hinged to the upper end of the connecting rod.

9. The three-phase linkage transmission device according to claim 1, characterized in that, The operating mechanism is a double-oil buffer spring operating mechanism.

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