Vacuum circuit breaker

Abstract

The invention provides a vacuum circuit breaker. The vacuum circuit breaker comprises a mounting frame; the solid-sealed polar pole component comprises three solid-sealed polar poles; the mechanical connecting part comprises a linkage rotating shaft, three driving connecting rod units and an auxiliary switch assembly; the operating part is arranged on the mounting frame and comprises a safety switch assembly for switching on and off the three solid-sealed polar poles; the safety switch assembly comprises a driving unit, a ratchet wheel unit and a linkage unit; the ratchet wheel unit comprises a jacking ratchet block and a ratchet wheel part. When the vacuum circuit breaker is powered off, the driving unit drives the auxiliary rotating shaft to rotate, the auxiliary rotating shaft drives the linkage rotating shaft through the auxiliary connecting rod set to keep in an open-circuit state and trip-out reset, when the vacuum circuit breaker is powered on, the ratchet unit limits the rotating direction of the auxiliary rotating shaft, and the ratchet block needs to be released and pressed manually to perform reset action. And the possibility of electrical element damage caused by automatic connection of tripping reset and overlarge instantaneous voltage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switchgear, and in particular to a vacuum circuit breaker. Background Art

[0002] The vacuum circuit breaker is named because its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and arc extinguishing without maintenance, and is widely used in distribution networks. The vacuum circuit breaker is an indoor power distribution device in 3~10kV, 50Hz three-phase AC system. It can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations. It is particularly suitable for use in places that require oil-free, less maintenance and frequent operation. The vacuum circuit breaker can be configured in the center cabinet, double-layer cabinet and fixed cabinet to control and protect high-voltage electrical equipment.

[0003] During use, vacuum circuit breakers avoid safety accidents by disconnecting the circuit. However, after the vacuum circuit breaker is powered off and then powered on again, there is a possibility that the circuit breaker will trip and reset automatically, and the instantaneous voltage will be too large, causing damage to electrical components. In addition, there may be a risk of leakage after the circuit is powered off, which may cause safety accidents. Summary of the invention

[0004] Based on this, in order to solve the above problems, the present invention provides a vacuum circuit breaker, and its specific technical solution is as follows:

[0005] A vacuum circuit breaker, comprising:

[0006] Install the frame;

[0007] A sealed pole component, comprising three sealed poles, wherein the three sealed poles are arranged at the front end of the mounting frame in a three-phase distribution manner;

[0008] The mechanical connection component includes a linkage shaft, three driving connecting rod units connected to the linkage shaft hub, and an auxiliary switch assembly connected to the linkage shaft;

[0009] An operating component, arranged on the mounting frame, comprises a safety switch assembly for performing a switching action on three sealed poles;

[0010] The safety switch assembly includes a driving unit, a ratchet unit, and a linkage unit, wherein the linkage unit includes an auxiliary rotating shaft and an auxiliary connecting rod group connecting the auxiliary rotating shaft and the linkage rotating shaft;

[0011] The ratchet unit comprises a pressing ratchet block arranged on the mounting frame and a ratchet member connected to the auxiliary shaft hub, and the pressing ratchet block is adapted to the ratchet member.

[0012] For the above-mentioned vacuum circuit breaker, when the vacuum circuit breaker is powered off, the driving unit drives the auxiliary rotating shaft to rotate, and the auxiliary rotating shaft drives the linkage rotating shaft through the auxiliary connecting rod group to remain in the disconnected state, and the circuit breaker is tripped and reset. When the vacuum circuit breaker is powered on, the rotation direction of the auxiliary rotating shaft is limited by the ratchet unit, and the linkage rotating shaft will not reset automatically. Manual operation is required to release the top pressure ratchet block to perform the reset action, thereby avoiding the possibility of automatic connection during trip reset and excessive instantaneous voltage causing damage to electrical components, thereby ensuring safety in use.

[0013] Furthermore, the driving unit includes a driving motor, a first gear arranged at the output end of the driving motor, and a second gear connected to the auxiliary shaft hub, the first gear and the second gear are meshed for transmission; the transmission ratio range of the first gear and the second gear is 1:10 to 1:25.

[0014] Further, the auxiliary connecting rod group includes a first connecting rod block, a second connecting rod block, and a third connecting rod block connected to the auxiliary rotating shaft; the first connecting rod block is provided with a first connecting part, a second connecting part and a third connecting part connected to the auxiliary rotating shaft hub; the second connecting rod block is connected to the second connecting part and the linkage rotating shaft; the third connecting rod block is connected to the third connecting part and the safety switch assembly.

[0015] Further, the mechanical connecting component also includes a spring-pressing assembly; the spring-pressing assembly includes a first spring-pressing unit and a second spring-pressing unit; the first spring-pressing unit includes a fourth connecting rod block and a first spring member, one end of the fourth connecting rod block is connected to the linkage shaft through the first connecting rod block, and the other end is provided with a connecting head, and one end of the first spring member presses the mounting frame; the second spring unit includes a spring-pressing block arranged on the linkage shaft, and a second spring member, one end of the second spring member is connected to the spring-pressing block, and the other end is connected to the mounting frame; the first spring member and the second spring member are respectively arranged at the intervals of three sealed poles.

[0016] Furthermore, the ratchet unit also includes a spring-pressing group; the spring-pressing group includes a spring-pressing swing arm rotatably connected to the mounting frame, a first torsion spring that presses the spring-pressing swing arm to swing outward, a swing connecting rod connected to the spring-pressing swing arm, and a clamping seat rotatably connected to the mounting frame; the top-pressure ratchet block is arranged on the clamping seat.

[0017] Further, the safety switch assembly includes a first switch unit; the first switch unit includes a first switch group and a first spring-pressing group, the first switch group includes a first button member rotatably connected to the mounting frame, and a first switch block connected to the first button member; the first spring-pressing group includes a first spring-pressing slider slidably disposed on the mounting frame, and a first elastic member driving the first spring-pressing slider to spring the first switch block.

[0018] Furthermore, the safety switch assembly also includes a second switch unit, which includes a second button member and a second linkage shaft connected to the second button member; the third connecting rod block is provided with a limit end; the second linkage shaft is provided with a notch adapted to the limit end, and a limit groove shoulder adapted to the first switch block.

[0019] Further, the safety switch assembly also includes a third switch unit; the third switch unit includes a third switch group and a third locking group, the third switch group includes a third button member, and a third linkage block connected to the third button member, the third linkage block is arranged below the first switch block, and the third linkage block is provided with a limit column adapted to the first switch block, and a locking contact surface; the third locking group includes a card wheel arc plate and a top member arranged on the auxiliary rotating shaft, the card wheel arc plate is provided with a locking contact surface adapted to the locking contact surface and a limit cylinder, the top member is adapted to the limit arc groove and tops the limit cylinder.

[0020] Furthermore, the safety switch assembly also includes a fourth switch unit; the fourth switch unit includes a fourth switch group and a fourth locking group; the fourth switch group includes a fourth button member, and a fourth linkage block connected to the fourth button member, and a swing column is provided at the end of the fourth linkage block; the fourth locking group includes a swing plate rotatably connected to the mounting frame, and a circular ring plate arranged on the auxiliary rotating shaft, the swing plate is provided with a swing arc groove adapted to the swing column, and the circular ring plate is provided with a protruding block adapted to the end of the swing plate.

[0021] Further, the sealed pole includes an arc extinguishing chamber assembly provided with a plum blossom contact; the plum blossom contact includes an annular bracket, a contact unit arranged in a circumferential manner outside the annular bracket, and an annular spring for fixing the contact unit to the annular bracket, the annular bracket includes a first mounting ring supported on the upper end of the contact unit, a second mounting ring supported on the lower end of the contact unit, and a connecting column connecting the first mounting ring and the second mounting ring, and the first mounting ring and the second mounting ring bracket are respectively connected to the contact unit through a clamping structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0023] Figure 1 is a schematic structural diagram of a vacuum circuit breaker according to an embodiment of the present invention;

[0024] Figure 2is a structural cross-sectional view of a vacuum circuit breaker according to an embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of a mechanical connection component and an operating component according to an embodiment of the present invention;

[0026] Figure 4 is a schematic structural diagram of a driving unit according to an embodiment of the present invention;

[0027] Figure 5 Schematic diagram of the structure of the operating component according to an embodiment of the present invention Figure 1 ;

[0028] Figure 6 Schematic diagram of the structure of the operating component according to an embodiment of the present invention Figure 2 ;

[0029] Figure 7 is a cross-sectional view of the structure of the operating component according to an embodiment of the present invention Figure 1 ;

[0030] Figure 8 is a cross-sectional view of the structure of the operating component according to an embodiment of the present invention Figure 2 ;

[0031] Fig. 9 is a cross-sectional view of the structure of the operating component according to an embodiment of the present invention Figure 3 ;

[0032] Fig.10 It is a schematic diagram of the structure of the plum blossom contact according to an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Installation frame; 2. Sealed pole parts; 3. Mechanical connection parts; 4. Operating parts;

[0035] 21. Solid-sealed pole; 22. Plum blossom contact; 23. Arc extinguishing chamber assembly;

[0036] 221. annular bracket; 222. contact unit;

[0037] 2211, first mounting ring; 2212, second mounting ring; 2213, connecting column;

[0038] 31. Linkage shaft; 32. Driving connecting rod unit; 33. Auxiliary switch assembly; 34. Spring pressure assembly;

[0039] 341, a first pressing unit; 342, a second pressing unit;

[0040] 3411, fourth connecting rod block; 3412, first spring member;

[0041] 3421, spring pressure block; 3422, second spring member;

[0042] 40. Safety switch assembly; 41. Driving unit; 42. Ratchet unit; 43. Linkage unit; 44. First switch unit; 45. Second switch unit; 46. Third switch unit; 47. Fourth switch unit;

[0043] 411, driving motor; 412, first gear; 413, second gear;

[0044] 421, top-pressing ratchet block; 422, ratchet wheel; 423, spring-pressing group; 424, spring-pressing swing arm; 425, first torsion spring; 426, swing connecting rod; 427, clamping seat;

[0045] 431, auxiliary rotating shaft; 432, auxiliary connecting rod assembly;

[0046] 4321, a first connecting rod block; 4322, a second connecting rod block; 4323, a third connecting rod block;

[0047] 441, first switch group; 442, first pressure group;

[0048] 4411. a first button member; 4412. a first switch block;

[0049] 4421, a first elastic slider; 4422, a first elastic member;

[0050] 451, second button member; 452, second linkage shaft;

[0051] 461, third switch group; 462, third locking group;

[0052] 4611, a third button member; 4612, a third linkage block;

[0053] 4621, card wheel arc plate; 4622, top part;

[0054] 471. Fourth switch group; 472. Fourth locking group;

[0055] 4711, fourth button member; 4712, fourth linkage block;

[0056] 4721. Swinging plate; 4722. Circular ring plate. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0058] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0060] The “first” and “second” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0061] like Figure 1 and Figure 2 , Figure 3 As shown, a vacuum circuit breaker in one embodiment of the present invention includes:

[0062] Install frame 1;

[0063] The sealed pole component 2 includes three sealed poles 21, and the three sealed poles 21 are arranged at the front end of the mounting frame 1 in a three-phase distribution manner;

[0064] The mechanical connection component 3 includes a linkage shaft 31, three driving connecting rod units 32 connected to the hub of the linkage shaft 31, and an auxiliary switch assembly 33 connected to the linkage shaft 31;

[0065] An operating component 4, arranged on the mounting frame 1, comprises a safety switch assembly 40 for performing a switching action on the three sealed poles 21;

[0066] The safety switch assembly 40 includes a driving unit 41, a ratchet unit 42, and a linkage unit 43, wherein the linkage unit 43 includes an auxiliary shaft 431 and an auxiliary connecting rod group 432 connecting the auxiliary shaft 431 and the linkage shaft 31;

[0067] The ratchet unit 42 includes a pressing ratchet block 421 disposed on the mounting frame 1 and a ratchet member 422 connected to the hub of the auxiliary shaft 431 , and the pressing ratchet block 421 is adapted to the ratchet member 422 .

[0068] For the above-mentioned vacuum circuit breaker, when the vacuum circuit breaker is powered off, the driving unit 41 drives the auxiliary rotating shaft 431 to rotate, and the auxiliary rotating shaft 431 drives the linkage rotating shaft 31 to remain in the circuit-breaking state through the auxiliary connecting rod group 432, and the circuit breaker is tripped and reset. When the vacuum circuit breaker is powered on, the rotation direction of the auxiliary rotating shaft 431 is limited by the ratchet unit 42, and the linkage rotating shaft 31 will not reset automatically. Manual operation is required to release the top pressure ratchet block 421 to perform the reset action, thereby avoiding the possibility of automatic connection during trip reset and excessive instantaneous voltage causing damage to electrical components, thereby ensuring safety in use.

[0069] like Figure 1 and Figure 3 , Figure 4 As shown, in one embodiment, the driving unit 41 includes a driving motor 411, a first gear 412 arranged at the output end of the driving motor 411, and a second gear 413 connected to the hub of the auxiliary rotating shaft 431, and the first gear 412 and the second gear 413 are meshed and transmitted; the transmission ratio range of the first gear 412 and the second gear 413 is 1:10 to 1:25. In this way, the auxiliary rotating shaft 431 is rotated by the driving motor 411 in sequence to drive the first gear 412 and the second gear 413, so that the auxiliary rotating shaft 431 drives the linkage rotating shaft 31 to perform a circuit-breaking action; at the same time, by limiting the transmission ratio range of the first gear 412 and the second gear 413, the driving torque that meets the use requirements is improved.

[0070] like Figure 5 and Figure 6 , Figure 7 As shown, in one embodiment, the auxiliary connecting rod group 432 includes a first connecting rod block 4321, a second connecting rod block 4322, and a third connecting rod block 4323 connected to the auxiliary rotating shaft 431; the first connecting rod block 4321 is provided with a first connecting portion, a second connecting portion, and a third connecting portion connected to the hub of the auxiliary rotating shaft 431; the second connecting rod block 4322 connects the second connecting portion and the linkage rotating shaft 31; the third connecting rod block 4323 connects the third connecting portion and the safety switch assembly 40. In this way, the auxiliary rotating shaft 431, the linkage rotating shaft 31, and the safety switch assembly 40 are stably connected through the auxiliary connecting rod group 432, so that the entire circuit breaker action is stable and reliable.

[0071] like Figure 3As shown, in one embodiment, the mechanical connecting component 3 also includes a spring-pressing assembly 34; the spring-pressing assembly 34 includes a first spring-pressing unit 341 and a second spring-pressing unit 342; the first spring-pressing unit 341 includes a fourth connecting rod block 3411 and a first spring member 3412, one end of the fourth connecting rod block 3411 is connected to the linkage shaft 31 through the first connecting rod block 4321, and the other end is provided with a connecting head, and one end of the first spring member 3412 presses the mounting frame 1; the second spring unit 342 includes a spring-pressing block 3421 and a second spring member 3422 arranged on the linkage shaft 31, one end of the second spring member 3422 is connected to the spring-pressing block 3421, and the other end is connected to the mounting frame 1; the first spring member 3412 and the second spring member 3422 are respectively arranged at the intervals of the three sealed poles 21. In this way, the first spring member 3412 and the second spring member 3422 are used to press the linkage shaft 31, so that the circuit where the vacuum circuit breaker is located is kept in a connected state; when the driving unit 41 drives the auxiliary shaft 431 to rotate, the auxiliary shaft 431 drives the linkage shaft 31 through the auxiliary connecting rod group 432 to keep the first spring member 3412 and the second spring member 3422 in an elastic state. Specifically, the first spring member 3412 is compressed and the second spring member 3422 is stretched.

[0072] In one embodiment, the ratchet unit 42 further includes a spring group 423; the spring group 423 includes a spring swing arm 424 rotatably connected to the mounting frame 1, a first torsion spring 425 for springing the spring swing arm 424 to swing outward, a swing link 426 connected to the spring swing arm 424, and a clamping seat 427 rotatably connected to the mounting frame 1; the pressing ratchet block 421 is arranged on the clamping seat 427. In this way, the first torsion spring 425 drives the spring swing arm 424 to move in a direction away from the ratchet member 422, thereby driving the pressing ratchet block 421 of the clamping seat 427 to clamp on the ratchet member 422, thereby limiting the rotation direction of the auxiliary rotating shaft 431; at the same time, the spring swing arm 424 is manually released to make the pressing ratchet block 421 away from the ratchet member 422 to perform a reset action, thereby ensuring safety in use.

[0073] like Figure 6 and Figure 7 , Figure 8 , Fig. 9As shown, in one embodiment, the safety switch assembly 40 includes a first switch unit 44; the first switch unit 44 includes a first switch group 441 and a first spring-pressing group 442, the first switch group 441 includes a first button member 4411 rotatably connected to the mounting frame 1, and a first switch block 4412 connected to the first button member 4411; the first spring-pressing group 442 includes a first spring-pressing slider 4421 slidably disposed on the mounting frame 1, and a first elastic member 4422 driving the first spring-pressing slider 4421 to spring-press the first switch block 4412. In this way, a circuit connection mechanism is provided on the first spring-pressing slider 4421, and when the first button member 4411 is pressed, the first switch block 4412 drives the first spring-pressing slider 4421 to overcome the elastic force of the first elastic member 4422, so that the circuit connection mechanism corresponding to the circuit breaker is connected.

[0074] In one embodiment, the safety switch assembly 40 further includes a second switch unit 45, which includes a second button member 451 and a second linkage shaft 452 connected to the second button member 451; the third link block 4323 is provided with a limit end; the second linkage shaft 452 is provided with a notch adapted to the limit end, and a limit groove shoulder adapted to the first switch block 4412. Thus, by pressing the second button member 451, the second button member 451 drives the notch on the second linkage shaft 452 to press the limit end of the third link block 4323, and the limit groove shoulder drives the first switch block 4412, so that the third link block 4323 drives the first link block 4321 to control the switch.

[0075] In one embodiment, the safety switch assembly 40 also includes a third switch unit 46; the third switch unit 46 includes a third switch group 461 and a third locking group 462, the third switch group 461 includes a third button member 4611, and a third linkage block 4612 connected to the third button member 4611, the third linkage block 4612 is arranged below the first switch block 4412, the third linkage block 4612 is provided with a limiting column adapted to the first switch block 4412, and a locking contact surface; the third locking group 462 includes a card wheel arc plate 4621 and a top member 4622 arranged on the auxiliary rotating shaft 431, the card wheel arc plate 4621 is provided with a locking contact surface adapted to the locking contact surface and a limiting cylinder, the top member 4622 is adapted to the limiting arc groove and tops the limiting cylinder. In this way, the first switch block 4412 is linked by the third linkage block 4612 , and only when the first switch block 4412 is pressed down by the first button member 4411 , the third switch group 461 can drive the top member 4622 to perform a corresponding switch operation.

[0076] In one embodiment, the safety switch assembly 40 also includes a fourth switch unit 47; the fourth switch unit 47 includes a fourth switch group 471 and a fourth locking group 472; the fourth switch group 471 includes a fourth button member 4711, and a fourth linkage block 4712 connected to the fourth button member 4711, and a swing column is provided at the end of the fourth linkage block 4712; the fourth locking group 472 includes a swing plate 4721 rotatably connected to the mounting frame 1, and a circular plate 4722 arranged on the auxiliary rotating shaft 431, the swing plate 4721 is provided with a swing arc groove adapted to the swing column, and the circular plate 4722 is provided with a protruding block adapted to the end of the swing plate 4721. Specifically, when the fourth switch group 471 drives the swing plate 4721 to swing, the rotation phase of the protruding block on the annular plate 4722 is different from the rotation phase when the second switch unit 45 drives the auxiliary rotating shaft 431 to rotate, that is, when the fourth switch unit 47 drives the auxiliary rotating shaft 431 to switch the circuit, the ratchet block 421 is pressed between the ratchet teeth of the ratchet wheel 422, and the auxiliary rotating shaft 431 can rely on the elastic potential energy provided by the spring pressure assembly 34 to restore to the passage state.

[0077] In one embodiment, the card wheel arc plate 4621 and the annular plate 4722 are respectively arranged on both sides of the first connecting rod block 4321.

[0078] like Figure 1 and Fig.10 As shown, in one embodiment, the sealed pole 21 includes an arc extinguishing chamber assembly 23 provided with a plum blossom contact 22; the plum blossom contact 22 includes an annular bracket 221, contact units 222 arranged in a circumferential manner outside the annular bracket 221, and an annular spring for fixing the contact unit 222 to the annular bracket 221, the annular bracket 221 includes a first mounting ring 2211 supported at the upper end of the contact unit 222, a second mounting ring 2212 supported at the lower end of the contact unit 222, and a connecting column 2213 connecting the first mounting ring 2211 and the second mounting ring 2212, and the first mounting ring 2211 and the second mounting ring 2212 brackets are respectively connected to the contact unit 222 through a clamping structure. In this way, the annular spring is used to elastically close and open the contact unit 222, so that the contact unit 222 has a certain tilting and swinging ability, which can achieve the effect of self-centering during the docking process, thereby improving the adaptability and reliability of the electrical connection and solving problems such as jamming and inability to stabilize contact and connection due to center offset during docking.

[0079] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A vacuum circuit breaker, characterized in that: include: Install the frame; A sealed pole component, comprising three sealed poles, wherein the three sealed poles are arranged at the front end of the mounting frame in a three-phase distribution manner; The mechanical connection component includes a linkage shaft, three driving connecting rod units connected to the linkage shaft hub, and an auxiliary switch assembly connected to the linkage shaft; An operating component, arranged on the mounting frame, comprises a safety switch assembly for performing a switching action on three sealed poles; The safety switch assembly includes a driving unit, a ratchet unit, and a linkage unit, wherein the linkage unit includes an auxiliary rotating shaft and an auxiliary connecting rod group connecting the auxiliary rotating shaft and the linkage rotating shaft; The ratchet unit comprises a pressing ratchet block arranged on the mounting frame and a ratchet member connected to the auxiliary shaft hub, and the pressing ratchet block is adapted to the ratchet member.

2. A vacuum circuit breaker according to claim 1, characterized in that: The driving unit comprises a driving motor, a first gear arranged at the output end of the driving motor, and a second gear connected to the auxiliary shaft hub, the first gear and the second gear meshingly transmitting; The transmission ratio of the first gear and the second gear ranges from 1:10 to 1:

25.

3. A vacuum circuit breaker according to claim 1, characterized in that: The auxiliary connecting rod assembly includes a first connecting rod block, a second connecting rod block, and a third connecting rod block connected to the auxiliary rotating shaft; The first connecting rod block is provided with a first connecting portion, a second connecting portion and a third connecting portion connected to the auxiliary rotating shaft hub; The second connecting rod block is connected to the second connecting portion and the linkage rotating shaft; The third connecting rod block connects the third connecting portion and the safety switch assembly.

4. A vacuum circuit breaker according to claim 3, characterized in that: The mechanical connection component also includes a spring-pressing assembly; The elastic pressing assembly includes a first elastic pressing unit and a second elastic pressing unit; The first elastic pressing unit includes a fourth connecting rod block and a first spring member, one end of the fourth connecting rod block is connected to the linkage shaft through the first connecting rod block, and the other end is provided with a connecting head, and one end of the first spring member presses the mounting frame; The second spring unit comprises a spring block arranged on the linkage shaft, and a second spring member, one end of the second spring member is connected to the spring block, and the other end is connected to the mounting frame; The first spring member and the second spring member are respectively arranged at intervals between the three sealed poles.

5. A vacuum circuit breaker according to claim 1, characterized in that: The ratchet unit also includes a spring pressing group; The spring pressing group includes a spring pressing swing arm rotatably connected to the mounting frame, a first torsion spring for pressing the spring pressing swing arm to swing outward, a swing connecting rod connected to the spring pressing swing arm, and a clamping seat rotatably connected to the mounting frame; The pressing ratchet block is arranged on the clamping seat.

6. A vacuum circuit breaker according to claim 3, characterized in that: The safety switch assembly includes a first switch unit; The first switch unit includes a first switch group and a first spring pressure group, the first switch group includes a first button member rotatably connected to the mounting frame, and a first switch block connected to the first button member; The first pressing group includes a first pressing slider slidably disposed on the mounting frame, and a first elastic member driving the first pressing slider to press the first switch block.

7. A vacuum circuit breaker according to claim 6, characterized in that: The safety switch assembly further comprises a second switch unit, wherein the second switch unit comprises a second button member and a second linkage shaft connected to the second button member; The third connecting rod block is provided with a limiting end; The second linkage shaft is provided with a notch adapted to the limiting end and a limiting groove shoulder adapted to the first switch block.

8. A vacuum circuit breaker according to claim 7, characterized in that: The safety switch assembly further includes a third switch unit; The third switch unit includes a third switch group and a third locking group, the third switch group includes a third button member and a third linkage block connected to the third button member, the third linkage block is arranged below the first switch block, and the third linkage block is provided with a limit column adapted to the first switch block, and a locking contact surface; The third locking group includes a card wheel arc plate and a top member arranged on the auxiliary rotating shaft. The card wheel arc plate is provided with a locking contact surface adapted to the card wheel arc plate and a limiting cylinder. The top member is adapted to the limiting arc groove and tops the limiting cylinder.

9. A vacuum circuit breaker according to claim 8, characterized in that: The safety switch assembly further includes a fourth switch unit; The fourth switch unit includes a fourth switch group and a fourth locking group; The fourth switch group includes a fourth button member and a fourth linkage block connected to the fourth button member, and a swing column is provided at the end of the fourth linkage block; The fourth locking group includes a swing plate rotatably connected to the mounting frame, and a circular ring plate arranged on the auxiliary rotating shaft, the swing plate is provided with a swing arc groove adapted to the swing column, and the circular ring plate is provided with a protruding block adapted to the end of the swing plate.

10. A vacuum circuit breaker according to claim 1, characterized in that: The sealed pole comprises an arc extinguishing chamber assembly provided with a plum blossom contact; The plum blossom contact includes an annular bracket, contact units arranged in a circumferential manner outside the annular bracket, and an annular spring for fixing the contact units to the annular bracket. The annular bracket includes a first mounting ring supported on the upper end of the contact unit, a second mounting ring supported on the lower end of the contact unit, and a connecting column connecting the first mounting ring and the second mounting ring. The first mounting ring and the second mounting ring bracket are respectively connected to the contact unit through a clamping structure.

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