Pole-mounted vacuum circuit breaker capable of preventing switching-on bounce

Abstract

The invention relates to a pole-mounted vacuum circuit breaker capable of preventing closing bounce, and relates to the field of vacuum circuit breakers, the pole-mounted vacuum circuit breaker capable of preventing closing bounce comprises an insulating pull rod and a vacuum arc-extinguishing chamber which are arranged on a shell, a moving contact and a static contact are arranged in the vacuum arc-extinguishing chamber, the moving contact extends out of the vacuum arc-extinguishing chamber and is connected with the insulating pull rod, and the static contact is connected with the insulating pull rod. The insulating pull rod is provided with a speed reduction unit, the speed reduction unit is used for reducing the sliding speed of the moving contact pushed by the double-arm connecting rod, the insulating pull rod is provided with a limiting unit, the moving contact is provided with a control unit, and the limiting unit is used for limiting the moving contact to be separated from the static contact. And the control unit can control the limiting unit to limit the sliding of the moving contact. The vacuum circuit breaker has the effects of preventing the moving contact and the static contact from bouncing when the circuit breaker is switched on, and improving the use safety of the vacuum circuit breaker.

Description

Technical Field

[0001] The present application relates to the field of vacuum circuit breakers, and in particular to a column-mounted vacuum circuit breaker with anti-closing bounce function. Background Art

[0002] The pole-mounted vacuum circuit breaker is an electrical device that integrates a vacuum interrupter and an operating mechanism, and is mainly used for the protection and control of power systems. Early circuit breakers mainly relied on air as an arc extinguishing medium, and closing bounce is an important parameter of the mechanical characteristics of the vacuum circuit breaker, which may affect the electrical life of the interrupter.

[0003] When the vacuum short circuit device is in use, since the contact structure of the pole-mounted vacuum circuit breaker is of the docking type, during docking, the double-arm connecting rod pushes the moving contact in the vacuum arc extinguishing chamber to contact the static contact through the insulating pull rod to achieve the closing of the circuit breaker. However, closing bounce is prone to occur during the closing process. Once closing bounce occurs, safety hazards such as burning, welding and even fire may occur, resulting in reduced safety in the use of the vacuum circuit breaker. Summary of the invention

[0004] In order to improve the problem that closing bounce is easily generated during closing of the circuit breaker, which poses a great safety hazard and reduces the safety of using the vacuum circuit breaker, the present application provides a closing bounce-proof column-mounted vacuum circuit breaker.

[0005] The present application provides a column-mounted vacuum circuit breaker with an anti-closing bounce function, which adopts the following technical solution: A vacuum circuit breaker on a column to prevent closing bounce, comprising an insulating pull rod and a vacuum arc extinguishing chamber arranged on a shell, wherein a moving contact and a static contact are arranged in the vacuum arc extinguishing chamber, the moving contact extends out of the vacuum arc extinguishing chamber and is connected to the insulating pull rod, the insulating pull rod is provided with a deceleration unit, the deceleration unit is used to reduce the sliding speed of the moving contact pushed by a double-arm connecting rod, the insulating pull rod is provided with a limit unit, the moving contact is provided with a control unit, the limit unit is used to limit the separation of the moving contact from the static contact, and the control unit can control the limit unit to limit the sliding of the moving contact.

[0006] By adopting the above technical solution, when the circuit breaker is closed, the operator pushes the insulating rod, and when the insulating rod pushes the moving contact to slide, the insulating rod is decelerated by the deceleration unit, thereby reducing the contact speed between the moving contact and the static contact. When the moving contact contacts the static contact, the control unit controls the limit unit to limit the sliding of the moving contact, thereby effectively avoiding the bouncing of the moving contact and the static contact when the circuit breaker is closed, thereby improving the safety of the use of the vacuum circuit breaker.

[0007] In a specific feasible implementation scheme, the deceleration unit includes a reduction gear, a driving screw, and an elastic extrusion piece. The shell is provided with a reduction rack along the sliding direction of the moving contact, the reduction gear is meshed with the reduction rack, the insulating pull rod is provided with a guide cylinder, the driving screw is rotatably arranged in the guide cylinder, the reduction gear is coaxially fixed on the driving screw and can slide along the reduction rack, the elastic extrusion piece is arranged in the guide cylinder, and the driving screw can drive the elastic extrusion piece to squeeze the reduction gear and slide.

[0008] By adopting the above technical solution, when the insulating pull rod slides, the insulating pull rod drives the reduction gear to slide on the reduction rack, and at the same time the reduction gear drives the driving screw to rotate, the driving screw drives the driving screw to rotate, and the driving screw drives the elastic extrusion piece to slide in the guide cylinder, the elastic extrusion piece squeezes the reduction gear, increases the resistance to the rotation of the reduction gear, thereby reducing the sliding speed of the insulating pull rod and reducing the contact speed between the moving contact and the static contact.

[0009] In a specific possible implementation scheme, the elastic extrusion member includes a drive plate, an extrusion plate, and a first spring. The drive plate and the extrusion plate are both slidably arranged in the guide cylinder. The drive screw passes through the drive plate and the extrusion plate. The drive screw is threadedly connected to the drive plate and is slidably arranged with the extrusion plate. The first spring is arranged between the drive plate and the extrusion plate. The drive plate can push the extrusion plate to slide toward the reduction gear through the first spring, and the extrusion plate can generate friction sliding with the reduction gear.

[0010] By adopting the above technical solution, when the reduction gear rotates, the reduction gear drives the driving screw to rotate, and the driving screw drives the driving plate to slide toward the extrusion plate. The driving plate drives the first spring to contract, and the first spring pushes the extrusion plate to squeeze the reduction gear. The friction between the extrusion plate and the reduction gear can be adjusted by the expansion and contraction of the first spring, so that the rotation speed of the reduction gear is reduced.

[0011] In a specific feasible implementation scheme, the limit unit includes a limit rod and a limit block, the shell is provided with a serpentine groove, the serpentine groove is arranged in a winding manner along the sliding direction of the insulating pull rod, the limit rod is slidably arranged on the insulating pull rod, the limit block is fixedly arranged on the limit rod and inserted into the serpentine groove, the limit block is fitted with the side wall of the serpentine groove and is slidably arranged, the limit block can drive the limit rod to slide, and the insulating pull rod is provided with a fixing for limiting the sliding of the limit rod.

[0012] By adopting the above technical solution, when the insulating pull rod slides, the insulating pull rod drives the limit block to slide in the serpentine groove through the limit rod. The limit block slides and drives the limit rod to slide at the same time. When the moving contact contacts the static contact, the control unit controls the fixing part to fix the limit rod, thereby fixing the insulating pull rod, effectively avoiding bouncing between the moving contact and the static contact, and improving the safety of the circuit breaker.

[0013] In a specific possible implementation scheme, the fixing part includes a triangular rack and a fixed triangular tooth. The triangular rack is fixedly arranged on the limiting rod along the length direction of the limiting rod. The fixed triangular tooth is inserted into the insulating pull rod and slidably arranged. The fixed triangular tooth can engage with the triangular rack. The control unit can drive the fixed triangular tooth to insert into the triangular rack.

[0014] By adopting the above technical solution, when the limiting rod is fixed, the control unit drives the fixed triangular tooth to be inserted into the triangular rack to complete the fixing of the limiting rod.

[0015] In a specific feasible implementation scheme, a first slide groove is provided on the insulating pull rod, and one of the two tooth surfaces on a single tooth of the triangular rack is set as a first tooth surface, and the other is set as a second tooth surface. The extension direction of the first slide groove is parallel to the first tooth surface. A guide rod is slidably provided on the insulating pull rod, and a sliding portion for inserting into the first slide groove is provided on the guide rod. The guide rod can slide along the first slide groove under the guidance of the sliding portion. A second slide groove is provided on the guide rod, and the extension direction of the second slide groove is parallel to the second tooth surface. A moving portion for inserting into the second slide groove is provided on the fixed triangular tooth, and the fixed triangular tooth can slide along the second slide groove under the guidance of the moving portion and toward the triangular rack.

[0016] By adopting the above technical solution, when the fixed triangular tooth slides to the first tooth surface, the control unit continues to drive the fixed triangular tooth, and the guide rod drives the fixed triangular tooth to slide along the first slide groove to the bottom of the tooth groove of the triangular rack. When the fixed triangular tooth slides to the second tooth surface, the fixed triangular tooth slides along the second slide groove to the bottom of the tooth groove of the triangular rack, thereby improving the accuracy of the fixing position of the limit rod and improving the reliability of the fixing of the limit rod.

[0017] In a specific possible implementation scheme, the control unit includes an insulating control rod, which is slidably inserted into the moving contact and the insulating pull rod, one end of the insulating control rod extends from the end surface of the moving contact close to the static contact, and the static contact can push the insulating control rod to slide. An elastic pushing member is provided on the insulating pull rod, and the elastic pushing member is connected to the fixed triangular tooth. The insulating control rod can squeeze the elastic pushing member so that the elastic pushing member pushes the fixed triangular tooth to insert into the triangular rack.

[0018] By adopting the above technical solution, when the moving contact contacts the stationary contact, the stationary contact squeezes the insulating control rod to slide, the insulating control rod squeezes the elastic pusher, and the elastic pusher pushes the fixed triangular tooth to insert into the triangular rack, thereby realizing the control of the meshing of the fixed triangular tooth and the triangular rack.

[0019] In a specific possible implementation scheme, the elastic pushing member includes a first connecting plate, a second connecting plate, and a second spring. The first connecting plate is hinged to the insulating pull rod, one end of the second connecting plate is hinged to the fixed triangular tooth through a hinge shaft, and the other end is hinged to the first connecting plate. The fixed triangular tooth and the hinge shaft are axially slidingly arranged, and the insulating control rod can squeeze the hinge point of the first connecting plate and the second connecting plate, so that the angle between the first connecting plate and the second connecting plate is increased. The second spring is arranged on the insulating pull rod and connected to the first connecting plate. The second spring is used to increase the angle between the first connecting plate and the second connecting plate.

[0020] By adopting the above technical solution, when the insulating control rod slides, the insulating control rod squeezes the hinge point between the first connecting plate and the second connecting plate, and then the first connecting plate and the second connecting plate open. At this time, the second spring contracts, and the second connecting plate pushes the fixed triangular tooth to be inserted into the triangular rack, completing the driving of the fixed triangular tooth by the insulating control rod. When the insulating control rod is disengaged from the static contact, the telescopic spring pushes the fixed triangular tooth to be disengaged from the triangular rack, and the insulating control rod is restored, thereby facilitating the re-closing of the circuit breaker.

[0021] In a specific feasible implementation scheme, the insulating pull rod includes a first rod body and a second rod body, the limiting rod is arranged on the first rod body, the first rod body is located on the side of the second rod body close to the static contact, the first rod body is provided with a fixing groove, a fixing block is slidably provided in the fixing groove, the insulating control rod is provided with a fixing groove for inserting the fixing block, the fixing block is inserted into the fixing groove, and the insulating control rod can be fixed to the first rod body, a third spring for pushing the fixing block to be inserted into the fixing groove is provided on the wall of the fixing groove, the fixing block is provided with a guide surface, the second rod body is provided with a pressure rod, the pressure rod can be inserted into the fixing groove, and is slidably arranged with the first rod body, the pressure rod is provided with a protrusion, and the protrusion can slide along the guide surface so that the fixed block is pulled out of the fixing groove.

[0022] By adopting the above technical solution, when the moving contact contacts the static contact, the fixed block slides to the fixed groove position, and then is inserted into the fixed groove under the push of the third spring. At this time, the fixed triangular tooth is completely inserted into the triangular rack, and the limit rod is fixed, thereby improving the stability of the contact fixation between the moving contact and the static contact; when the moving contact is disengaged from the static contact, the second rod body pulls the pressure rod to slide, and the pressure rod drives the protrusion to slide on the guide surface, and the protrusion pushes the fixed block. At this time, the third spring contracts, and the fixed block is pulled out of the fixed groove, releasing the fixation between the insulating control rod and the insulating pull rod, so that the limit block can slide in the serpentine groove, so that the circuit breaker can be opened, thereby improving the convenience of using the circuit breaker.

[0023] In a specific possible implementation scheme, a bellows is sleeved on the moving contact, one end of the bellows is fixedly connected to the moving contact, and the other end of the bellows is fixedly connected to the inner wall surface of the vacuum interrupter.

[0024] By adopting the above technical solution, when the moving contact slides, the bellows extends or shortens as the moving contact slides, thereby improving the sealing performance between the moving contact and the vacuum interrupter.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. When closing the circuit breaker, the operator pushes the insulating rod. When the insulating rod pushes the moving contact to slide, the insulating rod is decelerated by the deceleration unit, thereby reducing the contact speed between the moving contact and the static contact. When the moving contact contacts the static contact, the control unit controls the limit unit to limit the sliding of the moving contact, thereby effectively preventing the moving contact and the static contact from bouncing when the circuit breaker is closed, thereby improving the safety of the vacuum circuit breaker; 2. When the reduction gear rotates, the reduction gear drives the driving screw to rotate, and the driving screw drives the driving plate to slide toward the extrusion plate. The driving plate drives the first spring to contract, and the first spring pushes the extrusion plate to squeeze the reduction gear. The friction between the extrusion plate and the reduction gear can be adjusted by the expansion and contraction of the first spring, so that the rotation speed of the reduction gear is reduced, reducing the possibility of bouncing when the moving contact contacts the static contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an anti-closing bounce column-mounted vacuum circuit breaker in an embodiment of the present application.

[0027] Figure 2 is along Figure 1 Section view along line AA.

[0028] Figure 3 It is a schematic diagram used to show the structure of the reduction rack.

[0029] Figure 4 is along Figure 3 Cross-sectional view along line BB.

[0030] Figure 5 yes Figure 3 Enlarged view of part C in the middle.

[0031] Figure 6 It is an exploded view used to show the fixtures.

[0032] Figure 7 yes Figure 6 Enlarged view of part D in the middle.

[0033] Figure 8 It is a schematic diagram used to show the structure of the pressure rod.

[0034] Fig. 9 is along Figure 8 Cross-sectional view along line EE.

[0035] Fig.10 It is a structural diagram of the fixed block.

[0036] Explanation of the reference numerals: 11, housing; 12, insulating pull rod; 121, first rod body; 122, second rod body; 13, vacuum interrupter; 14, operation box; 141, double-arm connecting rod; 151, moving contact; 152, static contact; 161, upper outlet terminal; 162, lower outlet terminal; 17, bellows; 2, reduction unit; 21, reduction gear; 22, driving screw; 23, elastic extrusion member; 231, driving plate; 232, extrusion plate; 233, first spring; 234, friction part; 24, reduction rack; 25, guide cylinder; 3, limiting unit; 31, limiting rod; 32, limiting block; 33, support plate; 331, serpentine groove; 34, groove ;35. Fixing member;351. Triangular rack;352. Fixed triangular tooth;353. First slide groove;354. First tooth surface;355. Second tooth surface;356. Guide rod;3561. Sliding portion;357. Second slide groove;358. Moving portion;36. Elastic pushing member;361. First connecting plate;362. Second connecting plate;363. Second spring;364. Articulated support;365. Articulated shaft;366. Articulated seat;41. Fixed cavity;42. Fixed groove;43. Fixed block;44. Third spring;45. Guide surface;46. Pressure rod;47. Raised portion;48. Guide surface;49. Pull ring;5. Control unit;51. Insulating control rod. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-10 This application is described in further detail.

[0038] The embodiment of the present application discloses a column-mounted vacuum circuit breaker with anti-closing bounce function.

[0039] Reference Figure 1 , Figure 2A vacuum circuit breaker on a column for preventing closing bounce includes an insulating pull rod 12 and a vacuum interrupter 13 arranged on a housing 11. An operation box 14 is externally connected to the housing 11. The housing 11 is located between the vacuum interrupter 13 and the operation box 14. A moving contact 151 and a stationary contact 152 are arranged in the vacuum interrupter 13. The moving contact 151 and the stationary contact 152 are arranged opposite to each other. An upper outlet terminal 161 is arranged on the top of the vacuum interrupter 13. A lower outlet terminal 162 is arranged on the housing 11. The stationary contact 152 is electrically connected to the upper outlet terminal 161. The moving contact 151 is inserted into the housing 11 and connected to the lower outlet terminal 161. The terminal 162 is electrically connected, and the insulating pull rod 12 is slidably arranged in the shell 11. The insulating pull rod 12 includes a first rod body 121 and a second rod body 122. The first rod body 121 is fixedly connected to the moving contact 151, and the second rod body 122 is connected to the double-arm connecting rod 141 in the operating box 14. The double-arm connecting rod 141 can drive the insulating pull rod 12 to slide to realize the closing and opening operations of the circuit breaker. A bellows 17 is sleeved on the moving contact 151. The bellows 17 is made of aluminum material. One end of the bellows 17 is fixedly connected to the moving contact 151, and the other end is fixedly connected to the inner wall of the vacuum arc chamber 13.

[0040] Reference Figure 2 A deceleration unit 2 is provided on the first rod body 121, and the deceleration unit 2 is used to reduce the sliding speed of the insulating pull rod 12. A limit unit 3 is provided on the first rod body 121, and a control unit 5 is provided on the moving contact 151. The limit unit 3 is used to limit the separation of the moving contact 151 and the static contact 152. The control unit 5 can control the limit unit 3 to limit the sliding of the moving contact 151. The control unit 5 in this embodiment includes an insulating control rod 51, and the insulating control rod 51 is slidably inserted in the moving contact 151 and the insulating pull rod 12.

[0041] When the circuit breaker is closed, the operator pushes the insulating rod 12 to slide toward the static contact 152 through the double-arm connecting rod 141 in the operating box 14. When the insulating rod 12 pushes the moving contact 151 to slide, the insulating rod 12 is decelerated by the deceleration unit 2, thereby reducing the contact speed between the moving contact 151 and the static contact 152. When the moving contact 151 contacts the static contact 152, the control unit 5 controls the limit unit 3 to limit the sliding of the moving contact 151, thereby effectively avoiding the bouncing of the moving contact 151 and the static contact 152 when the circuit breaker is closed, thereby improving the safety of the use of the vacuum circuit breaker. When the moving contact 151 slides, the bellows 17 extends or shortens with the sliding of the moving contact 151, thereby improving the sealing of the moving contact 151 and the vacuum interrupter 13.

[0042] Reference Figure 3 , Figure 4The reduction unit 2 in this embodiment includes a reduction gear 21, a driving screw 22, and an elastic extrusion piece 23. The housing 11 is provided with a reduction rack 24 along the sliding direction of the moving contact 151. The reduction gear 21 is meshed with the reduction rack 24. A guide cylinder 25 is fixedly provided on the first rod body 121. One end of the guide cylinder 25 is sealed and has a rectangular cross-section. The driving screw 22 passes through the end wall of the guide cylinder 25 and is rotatably connected to the guide cylinder 25. The axial direction of the driving screw 22 is perpendicular to the sliding direction of the insulating pull rod 12. The reduction gear 21 is coaxially fixedly arranged at one end of the driving screw 22 extending out of the guide cylinder 25, and the elastic extrusion piece 23 is arranged in the guide cylinder 25.

[0043] Reference Figure 3 , Figure 4 The elastic extrusion member 23 in this embodiment includes a driving plate 231, an extrusion plate 232, and a first spring 233. The driving plate 231 and the extrusion plate 232 are both arranged in a sliding manner in the guide cylinder 25 at intervals. The driving plate 231 and the extrusion plate 232 are both concave-convexly matched with the guide cylinder 25. The extrusion plate 232 is arranged on a side of the driving plate 231 adjacent to the reduction gear 21. The driving screw 22 passes through the extrusion plate 232 and the driving plate 231 in sequence. The driving screw 22 is threadedly connected to the driving plate 231 and is rotatably connected to the extrusion plate 232. A spring 233 is arranged between the driving plate 231 and the extrusion plate 232. The two ends of the first spring 233 are respectively in contact with the driving plate 231 and the extrusion plate 232. When the reduction gear 21 slides toward the static contact 152, the driving screw 22 drives the driving plate 231 to slide toward the extrusion plate 232. The extrusion plate 232 is provided with a friction portion 234. The friction portion 234 passes through the end wall of the guide cylinder 25 and extends to the reduction gear 21. The friction portion 234 applies friction force to the reduction gear 21 by squeezing the reduction gear 21.

[0044] When the insulating pull rod 12 slides, the insulating pull rod 12 drives the reduction gear 21 to slide on the reduction rack 24, and at the same time the reduction gear 21 drives the driving screw 22 to rotate, and the driving screw 22 drives the driving screw 22 to rotate, and the driving screw 22 drives the driving plate 231 to slide toward the extrusion plate 232, and the driving plate 231 drives the first spring 233 to contract, and the first spring 233 pushes the extrusion plate 232 to squeeze the reduction gear 21. The friction between the extrusion plate 232 and the reduction gear 21 can be adjusted by the expansion and contraction of the first spring 233, thereby reducing the sliding speed of the insulating pull rod 12, reducing the contact speed of the moving contact 151 and the static contact 152, and reducing the possibility of bouncing when the moving contact 151 and the static contact 152 contact.

[0045] Reference Figure 3 , Figure 5The limiting unit 3 in this embodiment includes a limiting rod 31 and a limiting block 32. A support plate 33 is fixedly provided on the shell 11. The support plate 33 is provided with a serpentine groove 331. The serpentine groove 331 in this embodiment is a groove with a trajectory of a sine curve. The serpentine groove 331 is arranged in a winding manner along the sliding direction of the insulating pull rod 12. A groove 34 is provided on the first rod body 121, and the groove 34 penetrates to the two side walls along the sliding direction of the first rod body 121.

[0046] Reference Figure 6 , Figure 7 The limit rod 31 is slidably arranged on the groove wall of the groove 34 through the guide rail, and the sliding direction of the limit rod 31 is perpendicular to the sliding direction of the first rod body 121. The limit block 32 is fixedly arranged on the limit rod 31 and inserted into the serpentine groove 331. The limit block 32 is fitted with the side wall of the serpentine groove 331 and is slidably arranged. When the limit block 32 slides in the serpentine groove 331, the limit block 32 drives the limit rod 31 to slide back and forth in the serpentine groove 331. The insulating pull rod 12 is provided with a fixing member 35 for limiting the sliding of the limit rod 31. One end of the insulating control rod 51 extends from the end face of the moving contact 151 adjacent to the static contact 152, and the other end extends into the groove 34. The static contact 152 can push the insulating control rod 51 to slide.

[0047] Reference Figure 6 , Figure 7 The fixing member 35 in this embodiment includes a triangular rack 351 and a fixed triangular tooth 352. The triangular rack 351 is fixedly arranged on the limiting rod 31 along the length direction of the limiting rod 31. The groove 34 is provided with a first slide groove 353 on the side facing the insulating control rod 51. One of the two tooth surfaces on a single tooth of the triangular rack 351 is set as a first tooth surface 354, and the other is set as a second tooth surface 355. The extension direction of the first slide groove 353 is parallel to the first tooth surface 354. The first slide groove 353 is a dovetail groove. A guide rod 356 is slidably arranged on the first rod body 121. The guide rod 356 is provided with a sliding portion 3561 for inserting into the first slide groove 353. The sliding portion 3561 cooperates with the concave and convex of the first slide groove 353. The guide rod 356 is provided with a sliding portion 3561 for inserting into the first slide groove 353. The sliding portion 3561 cooperates with the concave and convex of the first slide groove 353. 56 can slide along the first slide groove 353 under the guidance of the sliding portion 3561, a second slide groove 357 is provided on the guide rod 356, the second slide groove 357 is a dovetail groove, the extension direction of the second slide groove 357 is parallel to the second tooth surface 355, a moving portion 358 inserted into the second slide groove 357 is provided on the fixed triangular tooth 352, the moving portion 358 and the second slide groove 357 are matched with each other, and the tip of the fixed triangular tooth 352 is opposite to the triangular rack 351, and the fixed triangular tooth 352 can slide along the second slide groove 357 under the guidance of the moving portion 358.

[0048] Reference Figure 6 , Figure 7The first rod body 121 is provided with an elastic pusher 36. The elastic pusher 36 in this embodiment includes a first connecting plate 361, a second connecting plate 362, and a second spring 363. A hinge support 364 is provided on the side wall of the groove 34 opposite to the insulating control rod 51. One end of the first connecting plate 361 is hinged to the hinge support 364, one end of the second connecting plate 362 is hinged to one end of the first connecting plate away from the hinge support 364, and a hinge shaft 365 is fixed on the other end. A hinge seat 366 is provided on the fixed triangular tooth 352. The hinge seat 366 passes through the fixed triangular tooth 352 and is slidably connected. The hinge shaft 365 is inserted into the hinge seat 366 and is rotatably connected. The fixed triangular tooth 352 can move along the hinge shaft 36 5 slides axially on the hinge seat 366, the axial sliding distance of the fixed triangular tooth 352 along the hinge shaft 365 is greater than one tooth spacing of the triangular rack 351, the second spring 363 is arranged on the opposite side of the groove 34 and the insulating control rod 51, the other end of the second spring 363 is fixedly connected to the first connecting plate 361, the second spring 363 applies a thrust to the first connecting plate 361 toward the insulating control rod 51, the insulating control rod 51 can squeeze the hinge point of the first connecting plate 361 and the second connecting plate 362, so that the angle between the first connecting plate 361 and the second connecting plate 362 is increased, and the second connecting plate 362 can push the fixed triangular tooth 352 to be completely inserted into the tooth groove of the triangular rack 351.

[0049] When the circuit breaker is closing, the second rod body 122 pushes the first rod body 121 to slide, and the first rod body 121 pushes the moving contact 151 to slide toward the static contact 152. The first rod body 121 slides and drives the limit rod 31 to slide. The limit rod 31 drives the limit block 32 to slide in the serpentine groove 331, and the limit block 32 drives the limit rod 31 to slide back and forth in the groove 34. When the insulating control rod 51 contacts the static contact 152, while continuing to push the moving contact 151 to move, the insulating control rod 51 slides toward the hinge point between the first connecting plate 361 and the second connecting plate 362, and pushes the first connecting plate 361 and the second connecting plate 362 to open. At this time, the second spring 363 is in a compressed state, and the second connecting plate 362 pushes the fixed triangular tooth 352 to insert into the triangular tooth When the limit rod 31 is fixed, the control unit 5 drives the fixed triangular tooth 352 to be inserted into the triangular rack 351. At this time, the fixed triangular tooth 352 slides axially along the hinge shaft 365 to adapt to the sliding of the limit rod 31. When the fixed triangular tooth 352 is fully inserted into the tooth groove of the triangular rack 351, the fixation of the limit rod 31 is completed. When the limit rod 31 is fixed, the limit block 32 is restricted by the groove wall of the serpentine groove 331, so that the moving contact 151 and the housing 11 are fixed, thereby completing the fixation between the moving contact 151 and the housing 11 when the moving contact 151 and the static contact 152 are in contact, so as to effectively avoid the bouncing between the moving contact 151 and the static contact 152 when closing the switch, thereby improving the safety of the circuit breaker.

[0050] When the fixed triangular tooth 352 is inserted into the tooth groove of the triangular rack 351, when the fixed triangular tooth 352 slides onto the first tooth surface 354, the insulating control rod 51 continues to drive the fixed triangular tooth 352, and the guide rod 356 drives the fixed triangular tooth 352 to slide along the first slide groove 353 to the bottom of the tooth groove of the triangular rack 351. When the fixed triangular tooth 352 slides onto the second tooth surface 355, the fixed triangular tooth 352 slides along the second slide groove 357 to the bottom of the tooth groove of the triangular rack 351, thereby improving the accuracy of the fixed position of the limit rod 31 while improving the reliability of the fixation of the limit rod 31.

[0051] Reference Figure 8 , Fig. 9 and Fig.10The first rod body 121 is provided with a fixed cavity 41, and the insulating control rod 51 passes through the fixed cavity 41. A fixed block 43 is slidably provided in the fixed cavity 41. The insulating control rod 51 is provided with a fixed groove 42 for inserting the fixed block 43. The fixed block 43 is inserted into the fixed groove 42, so that the insulating control rod 51 can be fixed to the first rod body 121. The fixed block 43 is provided with a third spring 44 on the side away from the insulating control rod 51. One end of the third spring 44 is connected to the fixed block 43, and the other end is connected to the groove wall of the fixed cavity 41. The third spring 44 applies an initial thrust to the fixed block 43 toward the insulating control rod 51. The fixed block 43 is provided with a guide surface 45. The distance from the guide surface 45 to the insulating control rod 51 is from the side close to the groove 34 toward The side away from the groove 34 gradually increases, and a pressure rod 46 is provided on the second rod body 122. The pressure rod 46 passes through the groove 34 and is inserted into the fixed cavity 41. The pressure rod 46 and the first rod body 121 are slidably arranged. A protrusion 47 is provided on the pressure rod 46. The protrusion 47 is provided with a guide surface 48 that can fit with the guide surface 45. The protrusion 47 can slide along the guide surface 45, so that the fixing block 43 is pulled out of the fixing groove 42. A pull ring 49 is fixed on the pressure rod 46. The pull ring 49 is arranged on a part of the pressure rod 46 in the groove 34. When the fixing block 43 is pulled out of the fixing groove 42, the guide surface 48 is not separated from the guide surface 45 at this time, and the pull ring 49 contacts the groove wall of the groove 34, so that the second rod body 122 pulls the first rod body 121 to slide.

[0052] When the static contact 152 contacts the moving contact 151, the third spring 44 pushes the fixing block 43 to be inserted into the fixing groove 42, so that the insulating control rod 51 is fixed to the insulating pull rod 12, thereby fixing the fixed triangular teeth 352, completing the fixing of the insulating pull rod 12 to the housing 11, and improving the contact stability between the static contact 152 and the moving contact 151.

[0053] When the circuit breaker is opened, the second rod body 122 slides first, and the second rod body 122 drives the pressure rod 46 to slide, and the pressure rod 46 drives the protrusion 47 to slide, and the guide surface 48 slides on the guide surface 45, so that the fixing block 43 is pulled out of the fixing groove 42, and the fixation of the insulating control rod 51 and the insulating pull rod 12 is released. At the same time, the pull ring 49 contacts the side wall of the groove 34, and the second rod body 122 pulls the first rod body 121 to slide, and the second spring 363 pushes the fixed triangular tooth 352 to gradually pull out the tooth groove of the triangular rack 351, and the fixation of the first rod body 121 and the housing 11 is released. At the same time, the second spring 363 pushes the insulating control rod 51 to extend out of the moving contact 151, and the insulating control rod 51 is restored, so as to facilitate the closing of the circuit breaker again and improve the convenience of the circuit breaker opening operation.

[0054] The implementation principle of the anti-closing bounce column-mounted vacuum circuit breaker in an embodiment of the present application is: when the circuit breaker is closed, the operator pushes the insulating pull rod 12. When the insulating pull rod 12 pushes the moving contact 151 to slide, the first rod body 121 drives the reduction gear 21 to slide along the reduction rack 24, and the reduction gear 21 drives the driving screw 22 to rotate, and the driving screw 22 drives the driving plate 231 to slide. The driving plate 231 pushes the friction part 234 on the extrusion plate 232 through the first spring 233 to squeeze the reduction gear 21, thereby reducing the contact speed between the moving contact 151 and the static contact 152.

[0055] When the moving contact 151 contacts the static contact 152, the insulating control rod 51 pushes the first connecting plate 361 and the second connecting plate 362 to open, and the second connecting plate 362 pushes the fixed triangular tooth 352 to insert into the triangular rack 351, so that the limit rod 31 and the first rod body 121 are fixed, so that the moving contact 151 and the housing 11 are fixed, thereby effectively preventing the moving contact 151 and the static contact 152 from bouncing when the circuit breaker is closed, thereby improving the safety of the vacuum circuit breaker.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A closing-prevention column-mounted vacuum circuit breaker, comprising an insulating pull rod (12) and a vacuum interrupter (13) arranged on a housing (11), wherein a moving contact (151) and a stationary contact (152) are arranged in the vacuum interrupter (13), characterized in that: The moving contact (151) extends out of the vacuum arc extinguishing chamber (13) and is connected to the insulating pull rod (12). The insulating pull rod (12) is provided with a deceleration unit (2), and the deceleration unit (2) is used to reduce the sliding speed of the double-arm connecting rod (141) pushing the moving contact (151). The insulating pull rod (12) is provided with a limiting unit (3). The moving contact (151) is provided with a control unit (5), and the limiting unit (3) is used to limit the separation of the moving contact (151) from the static contact (152). The control unit (5) can control the limiting unit (3) to limit the sliding of the moving contact (151).

2. The anti-closing bounce column mounted vacuum circuit breaker according to claim 1 is characterized in that: The reduction unit (2) comprises a reduction gear (21), a driving screw (22), and an elastic extrusion piece (23); the housing (11) is provided with a reduction rack (24) along the sliding direction of the moving contact (151); the reduction gear (21) is meshed with the reduction rack (24); a guide cylinder (25) is provided on the insulating pull rod (12); the driving screw (22) is rotatably arranged in the guide cylinder (25); the reduction gear (21) is coaxially fixed on the driving screw (22) and can slide along the reduction rack (24); the elastic extrusion piece (23) is arranged in the guide cylinder (25); the driving screw (22) can drive the elastic extrusion piece (23) to extrude the reduction gear (21) and slide.

3. The anti-closing bounce column mounted vacuum circuit breaker according to claim 2 is characterized in that: The elastic extrusion member (23) comprises a driving plate (231), an extrusion plate (232), and a first spring (233); the driving plate (231) and the extrusion plate (232) are both slidably arranged in the guide cylinder (25); the driving screw (22) passes through the driving plate (231) and the extrusion plate (232); the driving screw (22) is threadedly connected to the driving plate (231) and is slidably arranged with the extrusion plate (232); the first spring (233) is arranged between the driving plate (231) and the extrusion plate (232); the driving plate (231) can push the extrusion plate (232) to slide toward the reduction gear (21) through the first spring (233); and the extrusion plate (232) can generate frictional sliding with the reduction gear (21).

4. The anti-closing bounce column mounted vacuum circuit breaker according to claim 1 is characterized in that: The limiting unit (3) comprises a limiting rod (31) and a limiting block (32); the shell (11) is provided with a serpentine groove (331), the serpentine groove (331) is arranged in a winding manner along the sliding direction of the insulating pull rod (12); the limiting rod (31) is slidably arranged on the insulating pull rod (12); the limiting block (32) is fixedly arranged on the limiting rod (31) and inserted into the serpentine groove (331); the limiting block (32) is fitted with a side wall of the serpentine groove (331) and is slidably arranged; the limiting block (32) can drive the limiting rod (31) to slide; and the insulating pull rod (12) is provided with a fixing member (35) for limiting the sliding of the limiting rod (31).

5. The anti-closing bounce column mounted vacuum circuit breaker according to claim 4 is characterized in that: The fixing member (35) comprises a triangular rack (351) and a fixed triangular tooth (352); the triangular rack (351) is fixedly arranged on the limiting rod (31) along the length direction of the limiting rod (31); the fixed triangular tooth (352) is inserted into the insulating pull rod (12) and slidably arranged; the fixed triangular tooth (352) can mesh with the triangular rack (351); and the control unit (5) can drive the fixed triangular tooth (352) to be inserted into the triangular rack (351).

6. The anti-closing bounce column mounted vacuum circuit breaker according to claim 5, characterized in that: The insulating pull rod (12) is provided with a first slide groove (353), one of the two tooth surfaces on a single tooth of the triangular rack (351) is set as a first tooth surface (354), and the other is set as a second tooth surface (355), the extension direction of the first slide groove (353) is parallel to the first tooth surface (354), the insulating pull rod (12) is slidably provided with a guide rod (356), the guide rod (356) is provided with a sliding portion (3561) for inserting into the first slide groove (353), and the guide rod (356) can be The first sliding groove (353) slides along the guide of the sliding portion (3561), the guide rod (356) is provided with a second sliding groove (357), the extension direction of the second sliding groove (357) is parallel to the second tooth surface (355), and the fixed triangular tooth (352) is provided with a moving portion (358) inserted into the second sliding groove (357). The fixed triangular tooth (352) can slide along the second sliding groove (357) and toward the triangular rack (351) under the guidance of the moving portion (358).

7. The anti-closing bounce column mounted vacuum circuit breaker according to claim 5, characterized in that: The control unit (5) comprises an insulating control rod (51), the insulating control rod (51) is slidably inserted into the moving contact (151) and the insulating pull rod (12), one end of the insulating control rod (51) extends from the end surface of the moving contact (151) close to the static contact (152), the static contact (152) can push the insulating control rod (51) to slide, and the insulating pull rod (12) is provided with an elastic pusher (36), the elastic pusher (36) is connected to the fixed triangular tooth (352), and the insulating control rod (51) can squeeze the elastic pusher (36) so that the elastic pusher (36) pushes the fixed triangular tooth (352) to insert into the triangular rack (351).

8. The anti-closing bounce column mounted vacuum circuit breaker according to claim 7 is characterized in that: The elastic pushing member (36) includes a first connecting plate (361), a second connecting plate (362), and a second spring (363). The first connecting plate (361) is hinged to the insulating pull rod (12). One end of the second connecting plate (362) is hinged to the fixed triangular tooth (352) through a hinge shaft (365), and the other end is hinged to the first connecting plate (361). The fixed triangular tooth (352) and the hinge shaft (365) are axially slidably arranged. The insulating control rod (51) can squeeze the hinge point between the first connecting plate (361) and the second connecting plate (362), so that the angle between the first connecting plate (361) and the second connecting plate (362) is increased. The second spring (363) is arranged on the insulating pull rod (12) and connected to the first connecting plate (361). The second spring (363) is used to increase the angle between the first connecting plate (361) and the second connecting plate (362).

9. The anti-closing bounce column mounted vacuum circuit breaker according to claim 7, characterized in that: The insulating pull rod (12) comprises a first rod body (121) and a second rod body (122); the limiting rod (31) is arranged on the first rod body (121); the first rod body (121) is located on a side of the second rod body (122) close to the static contact (152); a fixing groove (42) is arranged on the first rod body (121); a fixing block (43) is slidably arranged in the fixing groove (42); a fixing groove (42) for inserting the fixing block (43) is arranged on the insulating control rod (51); the fixing block (43) is inserted into the fixing groove (42) so that the insulating control rod (51) can be moved. The fixing groove (42) is fixed to the first rod body (121); a third spring (44) is provided on the groove wall of the fixing groove (42) for pushing the fixing block (43) to be inserted into the fixing groove (42); a guide surface (45) is provided on the fixing block (43); a pressing rod (46) is provided on the second rod body (122); the pressing rod (46) can be inserted into the fixing groove (42) and is slidably arranged with the first rod body (121); a protrusion (47) is provided on the pressing rod (46); the protrusion (47) can slide along the guide surface (45) so that the fixing block (43) is pulled out of the fixing groove (42).

10. The anti-closing bounce column mounted vacuum circuit breaker according to claim 1, characterized in that: The moving contact (151) is sleeved with a bellows (17), one end of the bellows (17) is fixedly connected to the moving contact (151), and the other end is fixedly connected to the inner wall surface of the vacuum interrupter (13).

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