Switch cabinet and circuit breaker driving mechanism thereof

Abstract

The invention discloses a switch cabinet and a circuit breaker driving mechanism thereof. The mechanism comprises a mounting plate assembly, an energy storage driving assembly, a second energy storage shaft, a closing limiting assembly, an opening limiting assembly, a spline shaft, a closing driving assembly, an opening spring assembly, two energy storage spring assemblies and three phase driving assemblies. The energy storage driving assembly, the opening limiting assembly, the closing limiting assembly, the second energy storage shaft and the spline shaft are all arranged on the mounting plate assembly. The two energy storage spring assemblies are symmetrically installed at the two ends of the second energy storage shaft respectively. When the second energy storage shaft rotates, energy storage springs can be stretched. The energy storage driving assembly drives the second energy storage shaft to rotate. The second energy storage shaft is connected with the spline shaft through the closing driving assembly and drives the spline shaft to rotate. The closing limiting assembly limits the energy storage release of the energy storage spring; the opening limiting assembly is used for limiting rotation of the spline shaft during closing, and the opening spring assembly is compressed; the spline shaft can drive the phase driving assembly to move. The structure stability is high, and the working performance is effectively improved.

Description

Technical Field

[0001] This invention relates to a switch cabinet and its circuit breaker drive mechanism, specifically belonging to the technical field of gas-insulated switch cabinets. Background Technology

[0002] With the continuous advancement of my country's power grid transformation and upgrading projects, residents have increasingly higher requirements for power supply quality. Therefore, higher demands are being placed on switches used at various medium-voltage nodes, with modularity, maintenance-free operation, intelligence, high reliability, and long electrical life becoming the development trends for these switches. The emergence and rapid progress of gas-insulated switchgear has effectively solved these problems. Currently, most gas-insulated switchgear on the market typically uses a single energy storage spring for energy storage, which cannot meet the needs of high-current operating scenarios. Furthermore, due to the action of a single energy storage spring, the force on the energy storage shaft is uneven, and long-term use can affect the alignment of the energy storage shaft. This results in poor structural stability under high-current scenarios and a risk of overtravel during opening and closing due to high opening and closing speeds, as well as the risk of rebound closing. The resulting large instantaneous impact force can easily damage components, reducing their lifespan and even causing them to fail. Summary of the Invention

[0003] In order to solve the problems of the prior art, the first objective of the present invention is to provide a circuit breaker drive mechanism that improves working performance, meets the requirements of high current working scenarios, and has high structural stability and long service life.

[0004] A second objective of the present invention is to provide a switch cabinet including the circuit breaker drive mechanism described above.

[0005] To achieve the aforementioned first objective, the circuit breaker drive mechanism provided by this invention includes a mounting plate assembly, an energy storage drive assembly, a second energy storage shaft, a closing limit assembly, an opening limit assembly, a spline shaft, a closing drive assembly, an opening spring assembly, two energy storage spring assemblies, and three phase drive assemblies. The second energy storage shaft and the spline shaft are parallel to each other and both are parallel to the bottom wall of the drive mechanism chamber. The three phase drive assemblies are arranged at intervals along the axial direction of the spline shaft. The mounting plate assembly is disposed on the bottom wall and is perpendicular to the bottom wall. The energy storage drive assembly, the opening limit assembly, the closing limit assembly, the second energy storage shaft, and the spline shaft are all disposed on the mounting plate assembly. The two energy storage spring assemblies are... The energy storage springs are symmetrically installed at both ends of the second energy storage shaft. Each energy storage spring assembly includes an energy storage spring, which can stretch the energy storage spring when the second energy storage shaft rotates. During energy storage, the energy storage drive assembly drives the second energy storage shaft to rotate, and the energy storage spring stores energy. The closing limit assembly is used to limit the release of the energy stored in the energy storage spring. During closing, the energy storage spring is released, the second energy storage shaft rotates, and the second energy storage shaft drives the spline shaft to rotate through the closing drive assembly. The opening limit assembly is used to limit the rotation of the spline shaft during closing, and the opening spring of the opening spring assembly is compressed and stores potential energy. The spline shaft can drive the movement of each phase drive assembly to complete the opening and closing movements of the vacuum circuit breaker mechanism.

[0006] As can be seen from the above, the combination design of the second energy storage shaft and the spline shaft in this invention allows the second energy storage shaft to be used for the stretching or releasing of the energy storage spring, bearing large torque and impact loads. The spline shaft serves as the main output shaft, directly driving the three-phase crank arm, push rod, and tripping limit mechanism, transmitting precise motion and force while maintaining good alignment. Separate driving of the three phases avoids the use of an isolated main shaft, preventing deformation of the output shaft due to simultaneous impact forces acting on a single shaft. This significantly improves structural stability and extends service life. Furthermore, the symmetrical design of the two energy storage spring assemblies provides high symmetry stability, meeting the requirements of high-current applications.

[0007] A further embodiment includes a closing limit assembly comprising an energy storage limit crank arm assembly, a closing stop, a first stop reset component, a closing half-shaft, and a closing half-shaft reset component. The energy storage limit crank arm assembly includes a first roller and an energy storage limit crank arm. The closing half-shaft is rotatably mounted on a mounting plate assembly and has a closing notch for avoiding the closing stop. The energy storage limit crank arm is sleeved on the outside of a second energy storage shaft and rotates with the second energy storage shaft. The first roller is located on the side of the energy storage limit crank arm closest to the closing stop. The closing stop is sleeved on the outside of a splined shaft and is rotatable relative to the splined shaft. The second energy storage shaft drives the energy storage limit crank arm to rotate. During energy storage, the first roller on the energy storage limit crank arm can abut against the closing stop. During closing, the first stop reset component resets the closing stop, and the closing half-shaft reset component resets the closing half-shaft. Both the second energy storage shaft and the splined shaft are parallel to the closing half-shaft.

[0008] As can be seen above, the closing stop is blocked by the solid part on the closing half shaft. Because the closing half shaft does not rotate, its closing notch is not aligned with the closing stop, which causes the closing stop to be unable to rotate. Consequently, the second energy storage shaft cannot rotate, and the energy storage spring remains in a stretched state.

[0009] A further embodiment includes a tripping limit assembly comprising a tripping stop, a tripping crank arm, a tripping block, a limit pin, a second roller, a tripping half-shaft, a block tension spring, a second stop reset component, and a tripping half-shaft reset component. The tripping crank arm is sleeved on the outside of the splined shaft and rotates with it. The tripping block is located at the end of the tripping crank arm near the tripping stop. The tripping half-shaft is rotatably mounted on the mounting plate assembly. The tripping crank arm has an oblong hole. The limit pin is located at one end of the tripping block, and one end of the block tension spring is located on the tripping crank arm. One end is connected to the end of the tripping block with a limit pin. The tripping block moves within the oblong hole via the limit pin. The other end of the tripping block is equipped with a second roller, which contacts the surface of the tripping stop. The tripping half-shaft is provided with a tripping notch to avoid the tripping stop. The second energy storage shaft and the spline shaft are both parallel to the tripping half-shaft. When closing, the second roller of the tripping block abuts against the tripping stop, and the tripping stop abuts against the tripping half-shaft. When opening, the second stop reset component drives the tripping stop to reset, and the tripping half-shaft reset component drives the tripping half-shaft to reset.

[0010] As can be seen above, under the action of the tension spring, the second roller at the other end of the locking block always keeps in contact with the surface of the trip stop; when the roller passes over the inclined surface of the stop, it falls into the locking surface and blocks the trip stop; at this time, the trip stop is blocked by the solid part of the trip half shaft. Because the trip half shaft does not move, its trip notch is not aligned and cannot rotate; the trip stop block prevents the trip stop from retracting, the spline shaft is locked and cannot trip, and the transition is smooth by using the roller contact method.

[0011] A further embodiment includes each phase drive assembly comprising a crank arm bracket, a three-phase drive crank arm, a three-phase drive connecting rod, a circuit breaker push rod assembly, and a three-phase transmission crank arm. The crank arm bracket is mounted on the bottom wall. One end of the three-phase drive crank arm is connected to a spline shaft, the other end of the three-phase drive crank arm is connected to one end of the three-phase drive connecting rod, the other end of the three-phase drive connecting rod is connected to one end of the three-phase transmission crank arm, the other end of the three-phase transmission crank arm is hinged to the crank arm bracket, and the upstream end of the circuit breaker push rod assembly is hinged to the middle of the three-phase transmission crank arm.

[0012] As can be seen above, one end of the three-phase drive crank arm is connected to the spline shaft, the other end of the three-phase drive crank arm is connected to one end of the three-phase drive connecting rod, the other end of the three-phase drive connecting rod is connected to one end of the three-phase transmission crank arm, the other end of the three-phase transmission crank arm is hinged to the crank arm bracket, and the upstream end of the circuit breaker push rod assembly is hinged to the middle of the three-phase transmission crank arm. This can meet the small stroke control for closing.

[0013] A further embodiment includes a buffer mechanism in the circuit breaker drive mechanism. The buffer mechanism includes a hydraulic buffer assembly and a counterweight. The hydraulic buffer assembly is mounted on the bottom wall, and its buffer shaft extends vertically. The lower end of the tripping crank arm is connected to the buffer shaft of the hydraulic buffer assembly. The counterweight is located below and close to the circuit breaker push rod assembly. The counterweight is detachably connected to the three-phase drive crank arm. When tripping, the three-phase drive crank arm tilts, and the hinged end of the three-phase drive linkage and the three-phase drive crank arm is closer to the spline shaft than the hinged end of the three-phase drive crank arm and the crank arm bracket.

[0014] As can be seen from the above, the oil buffer is used to absorb excess energy after the circuit breaker is opened, preventing overtravel and rebound due to excessive energy after the circuit breaker is fully opened. However, although most of the energy is absorbed by the oil buffer after the circuit breaker is opened, there is still some rebound energy due to the impact of the crank arm assembly on the oil buffer during the opening. Therefore, the circuit breaker push rod is hinged in the middle of the three-phase drive crank arm rather than at the end, forming an asymmetrical lever structure. This converts the large-stroke rotation of the spline shaft into a small-stroke three-phase drive output. At the same time, it can also absorb some of the rebound force generated by the impact of the oil buffer during the opening. Furthermore, by adding a counterweight to increase the mass of the phase drive assembly, and by placing the counterweight close to the circuit breaker push rod assembly, it can also absorb some of the rebound force generated by the instantaneous contact between the crank arm assembly and the oil buffer during the opening.

[0015] A further embodiment includes an energy storage drive assembly comprising a motor, a turbine, a worm gear, a first energy storage shaft, a first gear, a second gear, and a linkage assembly consisting of a first one-way bearing, a second one-way bearing, and a third one-way bearing. The worm gear is rotatably mounted on the bottom wall or on a mounting plate assembly. The output end of the motor is connected to the first energy storage shaft via the first one-way bearing, and the motor drives the first energy storage shaft to rotate in the energy storage rotation direction via the first one-way bearing. The turbine is mounted on the first energy storage shaft via the third one-way bearing, and the turbine drives the first energy storage shaft to rotate in the energy storage rotation direction via the third one-way bearing. The first gear is mounted on the first energy storage shaft and rotates with it, and the worm gear meshes with the turbine. The second gear is mounted on the outside of the second energy storage shaft and is movable relative to the second energy storage shaft, and the first gear meshes with the second gear. The second gear drives the second energy storage shaft to rotate synchronously via the linkage assembly.

[0016] As can be seen from the above, the worm gear is designed to be self-locking, ensuring that the worm drives the first energy storage shaft to rotate in one direction while also saving effort. The self-locking function of the worm and the locking function of the second one-way bearing provide double protection, preventing accidents during manual energy storage operation and also distributing the locking pressure during electric operation. The first and third one-way bearings ensure that they do not interfere with each other when driving the first energy storage shaft to rotate independently.

[0017] A further embodiment is that the linkage component includes a ratchet and a pawl; the ratchet is sleeved on the outside of the second energy storage shaft and rotates with the second energy storage shaft; the pawl is mounted on the second gear, and the pawl can lock the ratchet and drive the second energy storage shaft to rotate.

[0018] A further embodiment is that the closing drive assembly includes a closing drive cam and a cam drive crank arm. The closing drive cam is sleeved on the second energy storage shaft and rotates with the second energy storage shaft. The cam drive crank arm is sleeved on the spline shaft and rotates with the spline shaft. The closing drive cam can abut against the cam drive crank arm and drive the spline shaft to rotate.

[0019] To achieve the second objective mentioned above, the switch cabinet provided by the present invention includes a circuit breaker drive mechanism as described above.

[0020] A further embodiment is that the switchgear includes a drive mechanism compartment and a gas filling compartment, with the gas filling compartment adjacent to the drive mechanism compartment and a sealing plate between them; the sealing plate is perpendicular to the bottom wall of the drive mechanism compartment; the second energy storage shaft and the spline shaft are both parallel to the bottom wall of the drive mechanism compartment and parallel to the sealing plate; a vacuum circuit breaker mechanism and a disconnecting switch mechanism are installed in the gas filling compartment, with the vacuum circuit breaker mechanism including an insulating pull rod; a circuit breaker drive mechanism and a disconnecting drive mechanism are installed in the drive mechanism compartment, with the disconnecting drive mechanism connected to the disconnecting switch mechanism; the downstream end of the circuit breaker push rod assembly of the circuit breaker drive mechanism is connected to the insulating pull rod.

[0021] As can be seen from the above, the three-phase drive of the circuit breaker switch adopts a splined shaft directly installed in the circuit breaker drive mechanism chamber for rotation drive. It can be made of metal, which can improve the structural strength. Unlike the traditional structure, it does not require an isolating shaft made of insulating material to pass through the circuit breaker drive mechanism chamber and extend into the gas chamber. The longer isolating shaft is affected by deflection, material strength (insulated isolating shafts are usually made of plastic) and stress. After long-term use of the switch, it will deform. At the same time, in terms of the force distribution, the axial force of this solution has a higher safety factor than the tangential torsion force of a single shaft.

[0022] A further embodiment is that the disconnecting switch mechanism includes an disconnecting main shaft and three disconnecting switch assemblies, which are arranged axially spaced along the disconnecting main shaft, which is perpendicular to the sealing plate. Each disconnecting switch assembly includes a main busbar, a disconnecting knife switch, and an electrical connection assembly. The disconnecting knife switch is sleeved on the outside of the disconnecting main shaft and rotates with it. Each disconnecting knife switch is equipped with multiple knife-head contacts. The stationary contact of the main busbar, the grounding stationary contact on the side wall of the gas chamber, and the stationary contact on the electrical connection assembly can each be electrically connected to a corresponding knife-head contact on the disconnecting knife switch. The electrical connection assembly is electrically connected to the vacuum interrupter.

[0023] In summary, the circuit breaker drive mechanism provided by this invention can improve working performance and meet the requirements of high current working scenarios while maintaining high structural stability. Attached Figure Description

[0024] Figure 1 This is a structural diagram of an embodiment of the switchgear of the present invention.

[0025] Figure 2 This is an internal structural diagram of the drive mechanism chamber and the air filling chamber in an embodiment of the switchgear of the present invention.

[0026] Figure 3 This is an omitted view of a first perspective of an embodiment of the circuit breaker drive mechanism of the present invention.

[0027] Figure 4 This is an omitted view of a second perspective of an embodiment of the circuit breaker drive mechanism of the present invention.

[0028] Figure 5 This is a partial cross-sectional view from a first perspective of an embodiment of the circuit breaker drive mechanism of the present invention.

[0029] Figure 6 This is a partial cross-sectional view from a second perspective of an embodiment of the circuit breaker drive mechanism of the present invention.

[0030] Figure 7 This is a partial cross-sectional view from a third perspective of an embodiment of the circuit breaker drive mechanism of the present invention.

[0031] Figure 8 This is a partial cross-sectional view from a fourth perspective of an embodiment of the circuit breaker drive mechanism of the present invention.

[0032] Figure 9 This is a structural diagram of the opening half-shaft of an embodiment of the circuit breaker drive mechanism of the present invention. Detailed Implementation

[0033] See Figures 1 to 9This embodiment provides a switchgear, which includes a drive mechanism chamber 1 and an inflation chamber 2. The inflation chamber 2 is adjacent to the drive mechanism chamber 1, and a sealing plate 10 is disposed between the inflation chamber 2 and the drive mechanism chamber 1. The sealing plate 10 is perpendicular to the bottom wall of the drive mechanism chamber 1. The drive mechanism chamber 1 is provided with a mounting plate assembly 11, an isolating drive mechanism 12, and a circuit breaker drive mechanism 3. The mounting plate assembly 11 includes multiple spaced mounting plates and is vertically disposed on the bottom wall of the drive mechanism chamber 1. The mounting plate assembly 11 is perpendicular to the sealing plate 10, and the circuit breaker drive mechanism 3 is mounted on the mounting plate assembly 11. The inflation chamber 2 is provided with a vacuum circuit breaker mechanism 20 and an isolating switch mechanism 24. The vacuum circuit breaker mechanism 20 includes an insulating pull rod 21, a lever assembly 22, and a solid-sealed pole 23 connected in sequence. A vacuum interrupter chamber 230 is disposed within the solid-sealed pole 23. The insulating pull rod 21 is movably connected to the sealing plate 10 through a sealing connector 13. The isolation drive mechanism 12 is connected to the disconnecting switch mechanism 24, the circuit breaker drive mechanism is connected to the circuit breaker, and the disconnecting switch mechanism 24 can be electrically connected to the vacuum circuit breaker mechanism 20.

[0034] The circuit breaker drive mechanism 3 includes a buffer mechanism 4, an energy storage drive assembly 5, a second energy storage shaft 32, a closing limit assembly 6, a opening limit assembly 9, a splined shaft 31, a closing drive assembly 7, an opening spring assembly 33, two energy storage spring assemblies 8, and three phase drive assemblies 34. The two energy storage spring assemblies 8 are symmetrically mounted at both ends of the second energy storage shaft 32. The energy storage drive assembly 5, the second energy storage shaft 32, the closing limit assembly 6, the opening limit assembly 9, and the splined shaft 31 are all mounted on the mounting plate assembly 11.

[0035] The disconnecting switch mechanism 24 includes an disconnecting spindle 240 and three disconnecting switch assemblies 241. The three disconnecting switch assemblies 241 are arranged axially at intervals along the disconnecting spindle 240, which is perpendicular to the sealing plate 10. Each disconnecting switch assembly 241 includes a main busbar copper bus 242, a disconnecting switch 243, and an electrical connection assembly 244. The disconnecting switch 243 is sleeved on the outside of the disconnecting spindle 240 and rotates with it. Each disconnecting switch 243 is equipped with multiple knife-head contacts. The stationary contact of the main busbar copper bus 242, the grounding stationary contact on the wall of the gas chamber 2, and the stationary contact on the electrical connection assembly 244 can each be electrically connected to a corresponding knife-head contact on the disconnecting switch 243. The electrical connection assembly 244 is electrically connected to the vacuum interrupter 240.

[0036] Combination Figure 2 and Figure 8 The buffer mechanism 4 includes a hydraulic buffer assembly 40 and a counterweight 42. The hydraulic buffer assembly 40 is mounted on the bottom wall of the drive mechanism chamber 1, and its buffer shaft 41 extends vertically. The circuit breaker drive mechanism 3 is connected to both the buffer mechanism 4 and the vacuum circuit breaker mechanism 20.

[0037] Combination Figure 3 and Figure 4 The energy storage drive assembly 5 includes a turbine 50, a worm gear 51, a motor 52, a first energy storage shaft 53, a first gear 54, a second gear 55, and a linkage assembly 56. The worm gear 51 is rotatably mounted on the mounting plate assembly 11. A first one-way bearing 530 is sleeved on the outer side of one end of the first energy storage shaft 53. A motor connecting shaft 520 is sleeved on the outer side of the output shaft of the motor 52 and the first one-way bearing 530. The output shaft of the motor 52 drives the first one-way bearing 530 to rotate through the motor connecting shaft 520, and the first one-way bearing 530 drives the first energy storage shaft 53 to rotate. The other end of the first energy storage shaft 53 is mounted on the mounting plate assembly 11 through a second one-way bearing 531. The self-locking function of the turbine 50 and the worm gear 51 and the locking function of the second one-way bearing 531 provide double protection, preventing accidents during manual operation of energy storage and also sharing the locking pressure during electric operation. The turbine 50 is mounted on the first energy storage shaft 53 via a third one-way bearing 500, and the turbine 50 can drive the first energy storage shaft 53 to rotate together. That is, during manual input, the turbine 50 drives the first energy storage shaft 53 in one direction only through the locking action of the third one-way bearing 500. Figure 4 The first energy storage shaft 53 rotates counterclockwise to store energy, while the outer ring of the first one-way bearing 530 rotates relative to it, thus disengaging from the output shaft of the motor 52. When an electric input is received, the motor 52 drives the first energy storage shaft 53 to rotate unidirectionally (counterclockwise) through the motor connecting shaft 520 under the locking action of the first one-way bearing 530. At this time, the first energy storage shaft 53 rotates relative to the outer ring of the third one-way bearing 500, thus disengaging from the turbine 50 and preventing interference between the two methods. The first gear 54 is sleeved on the first energy storage shaft 53 and rotates with it. The worm gear 51 meshes with the turbine 50, thereby driving the first energy storage shaft 53 to rotate. The linkage assembly 56 includes a ratchet 57 and a pawl 58. The ratchet 57 is sleeved on the outside of the second energy storage shaft 32 and rotates with it. The second gear 55 is sleeved on the outside of the second energy storage shaft 32 and is movable relative to it. The first gear 54 meshes with the second gear 55. A pawl 58 is mounted on the second gear 55. The pawl 58 can hold the ratchet 57 and drive the second energy storage shaft 32 to rotate, so that the second gear 55 can drive the second energy storage shaft 32 to rotate clockwise. Figure 4 The clockwise rotation causes the energy storage spring 84 to stretch.

[0038] The first energy storage shaft 53, the second energy storage shaft 32, and the spline shaft 31 are all parallel to the bottom wall of the drive mechanism chamber 1 and the sealing plate 10, respectively. The three phase drive components 34 are arranged at intervals along the axial direction of the second energy storage shaft 32. The first energy storage shaft 53, the second energy storage shaft 32, and the spline shaft 31 are parallel to each other in pairs. The first energy storage shaft 53, the second energy storage shaft 32, and the spline shaft 31 can all be rotatably inserted into the mounting plate assembly 11.

[0039] Combination Figures 5 to 9 The closing limit assembly 6 includes an energy storage limit crank arm assembly 60, a closing stop 63, a closing half-shaft 64, and a first stop spring 66 (first stop reset component). The first stop spring 66 is mounted on the mounting plate assembly 11, and its free end is connected to the closing stop 63. The first stop spring 66 is used to reset the closing stop 63. The energy storage limit crank arm assembly 60 includes a first roller 61 and an energy storage limit crank arm 62. The closing half-shaft 64 is mounted on the mounting plate assembly 11 and has a closing notch 65 for avoiding the closing stop 63. The energy storage limit crank arm 62 is sleeved on the outside of the second energy storage shaft 32 and rotates with the second energy storage shaft 32. The first roller 61 is located on the side of the energy storage limit crank arm 62 near the closing stop 63. The closing stop 63 is sleeved on the outside of the spline shaft 31 via the first stop bearing (not shown in the figure) and is rotatable relative to the spline shaft 31. The second energy storage shaft 32 drives the energy storage limit crank arm 62 to rotate, so that the first roller 61 on the energy storage limit crank arm 62 abuts against the closing stop 63.

[0040] Combination Figure 7 The closing drive assembly 7 includes a closing drive cam 70 and a cam drive crank arm 71. The closing drive cam 70 is sleeved on the second energy storage shaft 32 and rotates with the second energy storage shaft 32. The cam drive crank arm 71 is sleeved on the spline shaft 31 and rotates with the spline shaft 31. When closing, the closing drive cam 70 rotates with the second energy storage shaft 32 and contacts the cam drive crank arm 71, thereby driving the cam drive crank arm 71 to rotate, which in turn drives the spline shaft 31 to rotate.

[0041] Each energy storage spring assembly 8 includes an energy storage spring support 80, a first energy storage spring mounting plate 81, a second energy storage spring mounting plate 82, an energy storage spring 84, and an energy storage crank arm 83. The energy storage spring support 80 is mounted on the sealing plate 10. The energy storage crank arm 83 is sleeved on the end of the second energy storage shaft 32 and rotates with the second energy storage shaft 32. The first energy storage spring mounting plate 81 is hinged to the energy storage spring support 80, the second energy storage spring mounting plate 82 is hinged to the energy storage crank arm 83, and the two ends of the energy storage spring 84 are respectively connected to the first energy storage spring mounting plate 81 and the second energy storage spring mounting plate 82.

[0042] The closing half-shaft 64 is rotatably inserted into the mounting plate assembly 11.

[0043] Combination Figure 8 The tripping limit assembly 9 includes a tripping lever 90, a tripping crank arm 96, a tripping block 91, a limit pin 92, a second roller 93, a tripping half-shaft 94, a block tension spring (not shown in the figure), a second lever tension spring 98 (second lever reset component), and a tripping release spring 95 (tripping half-shaft reset component). The tripping crank arm 96 is sleeved on the outside of the spline shaft 31 and rotates with the spline shaft 31. One end of the second lever tension spring 98 is mounted on the mounting plate assembly 11, and the free end of the second lever tension spring 98 is connected to the tripping lever 90. The second lever tension spring 98 is used to reset the tripping lever 90. The tripping block 91 is located at the end of the tripping crank arm 96 near the tripping stop 90. One end of the block tension spring is mounted on the tripping crank arm 96, and the free end of the block tension spring is connected to the end of the tripping block 91 away from the tripping stop 90. The block tension spring is used to ensure the state of the tripping block 91 so that it can elastically contact the locking surface 900 of the tripping stop 90. The lower end of the tripping crank arm 96 is connected to the buffer shaft 41 of the hydraulic buffer assembly 40. The tripping half shaft 94 is rotatably mounted on the mounting plate assembly 11. The tripping crank arm 96 is provided with an oblong hole 97. A limit pin 92 is located at one end of the tripping block 91. The tripping block 91 moves within the oblong hole 97 through the limit pin 92. The other end of the tripping block 91 is provided with a second roller 93, which contacts the surface of the tripping stop 90. The tripping half shaft 94 is provided with a tripping notch 940 to avoid the tripping stop 90, so that the tripping stop 90 can pass smoothly.

[0044] The closing half-shaft 64, the opening half-shaft 94, and the spline shaft 31 are parallel to each other.

[0045] The trip spring assembly 33 includes a trip spring 330, a trip spring support 331, and a trip spring crank arm 332. The trip spring crank arm 332 is sleeved on the outside of the spline shaft 31 and rotates with the spline shaft 31. The trip spring support 331 is set on the bottom wall of the drive mechanism chamber 1. The two ends of the trip spring 330 are respectively hinged to the trip spring support 330 and the trip spring crank arm 332.

[0046] Three phase drive assemblies 34 are arranged axially at intervals along the spline shaft 31. Each phase drive assembly 34 includes a crank arm bracket 340, a three-phase drive crank arm 341, a three-phase drive connecting rod 342, a circuit breaker push rod assembly 343, and a three-phase transmission crank arm 344. The crank arm bracket 340 is mounted on the bottom wall of the drive mechanism chamber 1. One end of the three-phase drive crank arm 341 is connected to the spline shaft 31, and the other end of the three-phase drive crank arm 341 is connected to one end of the three-phase drive connecting rod 342. The other end of the three-phase drive connecting rod 342 is connected to one end of the three-phase transmission crank arm 344, and the other end of the three-phase transmission crank arm 344 is hinged to the crank arm bracket 340. The upstream end of the circuit breaker push rod assembly 343 is hinged to the middle of the three-phase transmission crank arm 344. The counterweight 42 is located below and close to the circuit breaker push rod assembly 343. The downstream end of the circuit breaker push rod assembly 343 is connected to the insulating tie rod 21. The counterweight 42 is detachably connected to the three-phase drive crank arm 344. When the circuit is opened, the hinged end of the three-phase drive linkage 342 and the three-phase drive crank arm 344 is away from the sealing plate 10 relative to the hinged end of the three-phase drive crank arm 344 and the crank arm bracket 340.

[0047] When the energy storage spring 84 stores energy, the worm gear 51 is manually rotated to drive the turbine 50 to rotate, and the turbine 50, connected to a one-way bearing, drives the first energy storage shaft 53 to rotate. Alternatively, when powered, the motor 52 drives the connecting shaft, which in turn connects to the one-way bearing, to rotate the first energy storage shaft 53.

[0048] The first energy storage shaft 53 drives the first gear 54 to rotate, which in turn drives the second gear 55 to rotate. The pawl 58 on the second gear 55 engages the ratchet 57, which in turn drives the second energy storage shaft 32 to rotate. The energy storage cranks 83 at both ends of the large energy storage shaft drive the energy storage spring 84 to stretch and store energy. When the energy storage spring 84 has been stretched past its dead point, the first roller 61 on the energy storage limit crank 62 abuts against the closing stop 63 under the action of the energy storage spring 84 returning to its original position. Since the closing half shaft 64 has not been opened, the closing stop 63 cannot rotate, thus locking the energy storage and releasing it.

[0049] During the closing operation, the closing button, in conjunction with the electromagnetic coil, drives the closing trip plate 67 to move. The closing half-shaft 64, connected to the closing trip plate 67, rotates accordingly, opening the closing notch 65 of the closing half-shaft 64. Under the reset action of the energy storage spring 84, the closing stop 63 loses its resistance and moves out of the closing notch 65, thus failing to stop the energy storage limit crank arm 62. Consequently, the energy storage spring 84 resets, releasing the stored energy and driving the second energy storage shaft 32 to rotate. After the energy storage limit crank arm 62 rotates past the closing stop 63, the closing stop 63 resets under the action of the first stop tension spring 66. The closing half-shaft 64 is reset by the closing trip spring (not shown in the figure, but with the same structure as the opening trip spring, i.e., the closing half-shaft reset component) provided on the mounting plate assembly 11. During rotation, the closing drive cam 70 on the second energy storage shaft 32 contacts the cam drive crank arm 71 and drives the cam drive crank arm 71 to rotate. The spline shaft 31 rotates in the opposite direction to the second energy storage shaft 32. The cam drive crank arm 71 drives the spline shaft 31 to rotate, which in turn pushes the circuit breaker push rod assembly 343 to output. At the same time, the spline shaft 31 compresses the opening spring 330 through the opening spring crank arm 332. The circuit breaker push rod connects to the insulating pull rod 21, which drives one end of the lever assembly 22 at the tail to move, causing the other end of the lever assembly 22 to move in the opposite direction to achieve closing. On the other hand, when the spline shaft 31 rotates, it drives the tripping crank arm 96 assembly to rotate. The tripping block 91 is provided with a second roller 93 at one end near the tripping stop 90. The second roller 93 at one end of the tripping block 91 on the tripping crank arm 96 assembly moves along the surface of the tripping stop 90 during rotation. When the second roller 93 rotates to the locking surface 900 of the tripping stop 90 and stops at the locking surface 900, it is pulled back by the block spring at the other end, causing the second roller 93 to abut against the tripping stop 90. Since the tripping half shaft 94 is not open, the tripping stop 90 cannot move, and the tripping stop 90 locks the spline shaft 31 to rotate.

[0050] During the tripping operation, the tripping button, linked to the electromagnetic coil, drives the tripping release plate 940 to move. The tripping release plate 940 drives the tripping half-shaft 94 to rotate, opening the tripping notch 940 of the tripping half-shaft 94. Under the restoring force of the tripping spring 330, the spline shaft 31 rotates, and the tripping locking block 91 on the spline shaft 31 rotates with the spline shaft 31. The tripping locking block 91 drives the tripping stop 90 to rotate and release the tripping locking block 91. When the second roller 93 of the tripping locking block 91 rotates past the locking surface 900 to the groove 901 at the tripping stop 90, the tripping operation continues. The tripping stop 90 is reset under the action of the second stop spring 98, and the tripping half shaft 94 is reset under the action of the tripping release spring 95. During the reset process of the tripping spring 330, the spline shaft 31 drives the tripping crank arm 96 and the three-phase drive crank arm 341 on the spline shaft 31 to rotate. The tripping crank arm 96 applies pressure to the hydraulic buffer assembly 40, and the three-phase drive crank arm 341 drives the three-phase transmission crank arm 344 to move. The three-phase transmission crank arm 344 drives the lever assembly 22 at the tail of the insulating pull rod 21 to move through the circuit breaker push rod, thereby opening the arc-extinguishing chamber to form a break.

[0051] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A circuit breaker drive mechanism, characterized in that: It includes a mounting plate assembly, an energy storage drive assembly, a second energy storage shaft, a closing limit assembly, an opening limit assembly, a spline shaft, a closing drive assembly, an opening spring assembly, two energy storage spring assemblies, and three phase drive assemblies; The second energy storage shaft and the spline shaft are parallel to each other and both are parallel to the bottom wall of the drive mechanism chamber. The three phase drive components are arranged at intervals along the axial direction of the spline shaft. The mounting plate assembly is disposed on the bottom wall and is perpendicular to the bottom wall; The energy storage drive assembly, the opening limit assembly, the closing limit assembly, the second energy storage shaft, and the spline shaft are all mounted on the mounting plate assembly; The two energy storage spring assemblies are symmetrically installed at both ends of the second energy storage shaft. Each energy storage spring assembly includes an energy storage spring, and the energy storage spring can be stretched when the second energy storage shaft rotates. During energy storage, the energy storage drive component drives the second energy storage shaft to rotate, and the energy storage spring stores energy. The closing limit component is used to limit the release of the stored energy from the energy storage spring; When the circuit is closed, the energy storage spring is released, the second energy storage shaft rotates, and the second energy storage shaft drives the spline shaft to rotate through the circuit closure drive assembly; The tripping limit assembly is used to limit the rotation of the spline shaft when the circuit is closed, and the tripping spring of the tripping spring assembly is compressed and stores potential energy; The splined shaft can drive each of the phase drive components to move, thereby completing the opening and closing movements of the vacuum circuit breaker mechanism.

2. The circuit breaker drive mechanism according to claim 1, characterized in that: The closing limit assembly includes an energy storage limit crank arm assembly, a closing stop, a first stop reset component, a closing half shaft, and a closing half shaft reset component. The energy storage limit crank arm assembly includes a first roller and an energy storage limit crank arm. The closing half shaft is rotatably mounted on the mounting plate assembly, and the closing half shaft is provided with a closing notch for avoiding the closing stop. The energy storage limiting crank arm is sleeved on the outside of the second energy storage shaft and rotates with the second energy storage shaft. The first roller is located on the side of the energy storage limiting crank arm near the closing lever. The closing stop is sleeved on the outside of the spline shaft and can rotate relative to the spline shaft. The second energy storage shaft drives the energy storage limiting crank arm to rotate. When storing energy, the first roller on the energy storage limiting crank arm can abut against the closing stop. When the circuit is closed, the first stop reset component drives the closing stop to reset, and the closing half-shaft reset component drives the closing half-shaft to reset. Both the second energy storage shaft and the spline shaft are parallel to the closing half shaft.

3. The circuit breaker drive mechanism according to claim 1, characterized in that: The tripping limit assembly includes a tripping lever, a tripping crank arm, a tripping block, a limit pin, a second roller, a tripping half shaft, a block tension spring, a second lever reset component, and a tripping half shaft reset component. The tripping crank arm is sleeved on the outside of the spline shaft and rotates with the spline shaft. The tripping block is located at the end of the tripping crank arm near the tripping lever. The tripping half-shaft is rotatably mounted on the mounting plate assembly. The tripping crank arm is provided with an oblong hole. The limiting pin is provided at one end of the tripping block. One end of the block tension spring is provided on the tripping crank arm. The other end of the block tension spring is connected to the end of the tripping block provided with the limiting pin. The tripping block moves in the oblong hole through the limiting pin. The other end of the tripping block is provided with a second roller. The second roller contacts the surface of the tripping stop. The tripping half shaft is provided with a tripping notch for avoiding the tripping stop; Both the second energy storage shaft and the spline shaft are parallel to the tripping half shaft; When the circuit is closed, the second roller of the circuit breaker block abuts against the circuit breaker lever, and the circuit breaker lever abuts against the circuit breaker half shaft; When the circuit breaker is tripped, the second tripping stop reset component drives the tripping stop to reset, and the tripping half-shaft reset component drives the tripping half-shaft to reset.

4. The circuit breaker drive mechanism according to claim 3, characterized in that: Each of the phase drive components includes a crank arm bracket, a three-phase drive crank arm, a three-phase drive connecting rod, a circuit breaker push rod assembly, and a three-phase transmission crank arm, wherein the crank arm bracket is disposed on the bottom wall; One end of the three-phase drive crank arm is connected to the spline shaft, the other end of the three-phase drive crank arm is connected to one end of the three-phase drive connecting rod, the other end of the three-phase drive connecting rod is connected to one end of the three-phase transmission crank arm, the other end of the three-phase transmission crank arm is hinged to the crank arm bracket, and the upstream end of the circuit breaker push rod assembly is hinged to the middle of the three-phase transmission crank arm.

5. The circuit breaker drive mechanism according to claim 4, characterized in that: The circuit breaker drive mechanism also includes a buffer mechanism, which includes a hydraulic buffer assembly and a counterweight. The hydraulic buffer assembly is mounted on the bottom wall, and the buffer shaft of the hydraulic buffer assembly extends vertically. The lower end of the tripping crank arm is connected to the buffer shaft of the hydraulic buffer assembly; The counterweight is located below and close to the circuit breaker push rod assembly. The counterweight is detachably connected to the three-phase transmission crank arm; When the circuit breaker is tripped, the three-phase transmission crank arm tilts, and the hinge end of the three-phase drive linkage and the three-phase transmission crank arm is closer to the spline shaft relative to the hinge end of the three-phase transmission crank arm and the crank arm bracket.

6. The circuit breaker drive mechanism according to any one of claims 1 to 5, characterized in that: The energy storage drive assembly includes a motor, a turbine, a worm gear, a first energy storage shaft, a first gear, a second gear, and a linkage assembly consisting of a first one-way bearing, a second one-way bearing, and a third one-way bearing. The worm gear is rotatably mounted on the bottom wall or on the mounting plate assembly. The output end of the motor is connected to the first energy storage shaft through the first one-way bearing, and the motor drives the first energy storage shaft to rotate in the energy storage rotation direction through the first one-way bearing. The turbine is mounted on the first energy storage shaft via the third one-way bearing. The turbine drives the first energy storage shaft to rotate in the energy storage rotation direction via the third one-way bearing. The first gear is mounted on the first energy storage shaft and rotates with the first energy storage shaft. The worm gear meshes with the turbine. The second gear is sleeved on the outside of the second energy storage shaft and is movable relative to the second energy storage shaft; the first gear meshes with the second gear. The second gear can drive the second energy storage shaft to rotate synchronously via the linkage component; The linkage component includes a ratchet and a pawl; The ratchet is sleeved on the outside of the second energy storage shaft and rotates with the second energy storage shaft; The pawl is mounted on the second gear, and the pawl can lock the ratchet and drive the second energy storage shaft to rotate.

7. The circuit breaker drive mechanism according to any one of claims 1 to 5, characterized in that: The closing drive assembly includes a closing drive cam and a cam drive crank arm. The closing drive cam is sleeved on the second energy storage shaft and rotates with the second energy storage shaft. The cam drive crank arm is sleeved on the spline shaft and rotates with the spline shaft. The closing drive cam can abut against the cam drive crank arm and drive the spline shaft to rotate.

8. A switch cabinet, characterized in that... Includes the circuit breaker drive mechanism as described in claim 4 or 5.

9. The switchgear according to claim 8, characterized in that: The switch cabinet includes a drive mechanism chamber and an inflation chamber, the inflation chamber being adjacent to the drive mechanism chamber, and a sealing plate being provided between the inflation chamber and the drive mechanism chamber; The sealing plate is perpendicular to the bottom wall of the drive mechanism chamber; Both the second energy storage shaft and the spline shaft are parallel to the bottom wall of the drive mechanism chamber, and both the second energy storage shaft and the spline shaft are parallel to the sealing plate; The inflation chamber is equipped with a vacuum circuit breaker mechanism and a disconnecting switch mechanism, and the vacuum circuit breaker mechanism includes an insulating pull rod; The drive mechanism chamber is equipped with a circuit breaker drive mechanism and an isolation drive mechanism, and the isolation drive mechanism is connected to the isolation switch mechanism. The downstream end of the circuit breaker push rod assembly of the circuit breaker drive mechanism is connected to the insulating pull rod.

10. The switchgear according to claim 9, characterized in that: The disconnecting switch mechanism includes an isolation spindle and three disconnecting switch assemblies, the three disconnecting switch assemblies being arranged axially spaced along the isolation spindle, the isolation spindle being perpendicular to the sealing plate; Each of the aforementioned disconnector switch assemblies includes a main busbar, a disconnector switch, and an electrical connection assembly. The disconnector switch is sleeved on the outside of the disconnector spindle and rotates with the disconnector spindle. Each of the isolating switches is provided with multiple knife-head contacts. The stationary contact of the main bus copper busbar, the grounding stationary contact on the side wall of the gas chamber, and the stationary contact on the electrical connection assembly can each be electrically connected to a corresponding knife-head contact on the isolating switch. The electrical connection assembly is electrically connected to the vacuum interrupter.

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