Interlocking mechanism for disconnecting switch of circuit breaker

Abstract

According to the circuit breaker isolation switch interlocking mechanism, an isolation switch comprises an isolation switch panel, a closing operation shaft, a grounding operation shaft and an isolation transmission plate, and a circuit breaker comprises a circuit breaker panel, a transmission shaft and a closing knob. The interlocking mechanism comprises a sliding baffle plate which is arranged on the disconnecting switch panel and is used for shielding one of the closing operation shaft and the grounding operation shaft, the closing operation shaft is linked with a locking structure used for locking the closing knob, the locking structure is used for driving a locking plate arranged on the circuit breaker panel, and when the disconnecting switch is not closed, the locking plate is locked by the locking structure. The locking structure drives the locking plate to lock the closing knob and prevent the closing knob from rotating; after the disconnecting switch is closed and the operating handle is drawn out, the locking plate is unlocked with the closing knob through the locking structure and can rotate to close the circuit breaker, the sliding baffle plate cannot be operated when the disconnecting switch is closed and shields the grounding operating shaft, and the operating handle cannot be inserted into the closing operating shaft after the circuit breaker is closed.

Description

Technical Field

[0001] The utility model relates to a circuit breaker isolating switch interlocking mechanism, belonging to the field of power components. Background Art

[0002] Disconnectors (commonly known as "knife switches") generally refer to high-voltage disconnectors, that is, disconnectors with a rated voltage of 1kV or above, usually referred to as disconnectors. They are the most commonly used type of high-voltage switchgear. Their working principle and structure are relatively simple, but due to their large usage and high requirements for working reliability, they have a great impact on the design, establishment and safe operation of substations and power plants. The main feature of disconnectors is that they have no arc extinguishing ability and can only open and close circuits without load current. Disconnectors are used at all levels of voltage to change circuit connections or isolate lines or equipment from power supplies.

[0003] Circuit breakers are a common type of high-voltage switchgear in power systems, used to cut off overload current and short-circuit current. When using a circuit breaker, it is necessary to close it to energize it, thereby isolating and reclosing it. The closing mechanism of a circuit breaker is usually composed of an electromagnet, mechanical transmission, springs, etc., and can achieve the closing action of the circuit breaker under the action of external signals.

[0004] In order to ensure the safety of operation, the operation of high-voltage switches must follow a certain operation sequence, that is, when closing the switch, close the isolating switch first and then the circuit breaker; when opening the switch, pull the circuit breaker first and then the isolating switch; otherwise, misoperation will occur, causing a phase-to-phase short circuit accident. For this reason, an interlock must be installed between the circuit breaker and the isolating switch to prevent misoperation. The existing interlocking structure is usually complex in structure, poor in linkage, unstable in locking effect, requires manual locking, and is complicated to operate. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a circuit breaker isolating switch interlocking mechanism.

[0006] A circuit breaker isolating switch interlocking mechanism, the isolating switch comprises an isolating switch panel, a closing operation shaft, a grounding operation shaft and an isolating transmission plate, the circuit breaker comprises a circuit breaker panel, a transmission shaft and a closing knob, the interlocking mechanism comprises a sliding baffle plate arranged on the isolating switch panel for shielding one of the closing operation shaft and the grounding operation shaft, the closing operation shaft is linked with a locking structure for locking the closing knob, the locking structure is used to drive the locking plate arranged on the circuit breaker panel, when the isolating switch is not closed, the locking structure drives the locking plate to lock the closing knob so that it cannot rotate; when the isolating switch is closed and the operating handle is pulled out, The locking plate can be rotated to close the circuit breaker by unlocking the closing knob through the locking structure. The sliding baffle blocks the grounding operating shaft and cannot be operated after the disconnector is closed. The operating handle cannot be inserted into the closing operating shaft after the circuit breaker is closed. By arranging the sliding baffle in conjunction with the locking structure and the locking plate, the other mechanism can be locked when one of the disconnector and the circuit breaker is operated to prevent misoperation and the like, and there is no need to manually lock it. It is simplified and only the closing knob in the circuit breaker is locked, which simplifies the locking structure and the locking route, ensures safe use, and reduces the difficulty of maintenance and installation.

[0007] Furthermore, a closing link plate is provided on the closing knob, a first limit groove is provided on the closing link plate, the locking plate is rotatably arranged on the circuit breaker panel, and a second limit groove is provided at one end of the locking plate to engage with the limit groove when the isolating switch is not closed.

[0008] Preferably, the other end of the locking plate is provided with a pushing portion for linkage with the transmission shaft, the fixed sleeve on the transmission shaft is provided with a driving sleeve, the driving sleeve is provided with a driving block, and the driving block abuts against the pushing portion through a rotating action when the circuit breaker is closed.

[0009] Furthermore, the locking structure includes a connecting plate that is connected to the locking plate and is retractable, the other end of the connecting plate is connected to a rotating plate, the rotating plate is linked to a movable plate slidably installed on the isolating switch panel, and the isolating switch panel is also provided with a fixed plate, and the fixed plate is provided with a limit portion for limiting the sliding travel of the movable plate on the isolating switch panel.

[0010] Furthermore, a first through slot is provided on the fixed plate, and one end of the movable plate passes through the fixed plate through the first through slot and is engaged with the limiting portion.

[0011] Furthermore, the limiting part is rotatably arranged on the fixed plate in a vertical state, and the limiting part includes a first limiting arm linked to the operating handle and a second limiting arm clamped to the movable plate, and the movable plate is provided with a second through groove clamped to the second limiting arm.

[0012] Preferably, a micro switch is also provided on the isolating switch panel, and the rotation of the isolating transmission plate drives the moving plate to move, thereby triggering the micro switch when the isolating switch is not in a closed state.

[0013] Furthermore, a fifth through slot is provided on the isolating switch panel, and a movable arm is provided on the movable plate, which is linked with the isolating transmission plate through the fifth through slot. The movable arm abuts against the micro switch to trigger the micro switch when the isolating switch is not closed, and is separated from the micro switch after closing in the pulled-out state.

[0014] Preferably, a closing rotating plate is sleeved on the closing operating shaft, a grounding rotating plate is sleeved on the grounding operating shaft, and a third through slot and a fourth through slot are provided on the isolating switch panel. A first sliding plate is slidably provided in the third through slot and a sliding baffle is driven by the closing rotating plate to move toward the direction of the grounding operating shaft. A second sliding plate is slidably provided in the fourth through slot and a sliding baffle is driven by the grounding rotating plate to move toward the direction of the closing operating shaft.

[0015] Furthermore, one end of the first sliding plate and the second sliding plate extends to the inner side of the panel, and the closing rotating plate and the grounding rotating plate are arranged in a cam shape, and the closing rotating plate and the grounding rotating plate push the first sliding plate and the second sliding plate to move through a rotating action.

[0016] The beneficial effects of the utility model are as follows: by setting a sliding baffle in conjunction with a locking structure and a locking plate, the isolating switch and the circuit breaker can be locked when one of the mechanisms is operated to prevent misoperation and the like, and there is no need to manually lock them, which simplifies the locking structure and the locking route, ensures safe use, and reduces the difficulty of maintenance and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0018] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of another perspective of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the utility model from a rear-view perspective;

[0021] Figure 4 for Figure 3 Schematic diagram of the structure with some parts removed;

[0022] In the figure, 1, disconnector; 11, disconnector panel; 111, fifth through slot; 112, third through slot; 113, first sliding plate; 114, fourth through slot; 115, second sliding plate; 12, closing operation shaft; 121, isolation transmission plate; 122, closing rotating plate; 13, grounding operation shaft; 132, grounding rotating plate; 14, micro switch; 2, circuit breaker; 21, circuit breaker panel; 22, transmission shaft; 221, drive sleeve; 222, drive block ; 223, spring; 23, closing knob; 231, closing connecting plate; 232, first limiting groove; 3, interlocking mechanism; 31, sliding baffle; 32, locking structure; 33, connecting plate; 34, rotating plate; 35, moving plate; 351, second through groove; 352, moving arm; 36, fixed plate; 361, first through groove; 37, limiting part; 371, first limiting arm; 372, second limiting arm; 4, locking plate; 41, second limiting groove; 42, pushing part. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0024] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0025] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0026] like Figure 1-4As shown, an embodiment of the interlocking mechanism of a circuit breaker disconnector of the utility model is shown, the disconnector 1 includes a disconnector 1 panel, a closing operation shaft 12, a grounding operation shaft 13 and an isolation transmission plate 121, the circuit breaker 2 includes a circuit breaker 2 panel, a transmission shaft 22 and a closing knob 23, the interlocking mechanism 3 includes a sliding baffle 31 provided on the disconnector 1 panel for shielding one of the closing operation shaft 12 and the grounding operation shaft 13, the closing operation shaft 12 is linked with a locking structure 32 for locking the closing knob 23, the locking structure 32 is used to drive a locking plate 4 provided on the circuit breaker 2 panel, when the disconnector 1 is not closed, the locking structure 32 drives the locking plate 4 to lock the closing knob 23 so that it cannot rotate; when the disconnector 1 is closed, the locking plate 4 is locked and the closing knob 23 is locked ... After the disconnector 1 is closed and the operating handle is pulled out, the locking plate 4 is unlocked by the locking structure 32 and the closing knob 23 and can be rotated to close the circuit breaker 2. The sliding baffle 31 blocks the grounding operating shaft 13 and cannot be operated after the disconnector 1 is closed. After the circuit breaker 2 is closed, the operating handle cannot be inserted into the closing operating shaft 12. By arranging the sliding baffle 31 to cooperate with the locking structure 32 and the locking plate 4, the disconnector 1 and the circuit breaker 2 can be locked when one of the mechanisms is operated to prevent misoperation and the like, and there is no need to manually lock it. It is simplified and only the closing knob 23 in the circuit breaker 2 is locked, which simplifies the locking structure and the locking route, ensures safe use, and reduces the difficulty of maintenance and installation.

[0027] The closing knob 23 is provided with a closing link plate 231, and the closing link plate 231 is provided with a first limit groove 232. The locking plate 4 is rotatably arranged on the panel of the circuit breaker 2, and one end of the locking plate 4 is provided with a second limit groove 41 that is engaged with the limit groove when the disconnector 1 is not closed.

[0028] The other end of the locking plate 4 is provided with a pushing portion 42 for linkage with the transmission shaft 22, and a driving sleeve 221 is fixedly sleeved on the transmission shaft 22, and a driving block 222 is provided on the driving sleeve 221. When the circuit breaker 2 is closed, the driving block 222 abuts against the pushing portion 42 through a rotating action, which can prevent the locking plate 4 from rotating too much and limit the disconnector from closing.

[0029] A spring 223 is also provided on the driving sleeve 221, and the end of the closing link plate 231 is bent. The spring 223 abuts against the end face of the bent end of the closing link plate 231 when the circuit breaker is opened, and abuts against the side wall of the closing link plate 231 when the circuit breaker is closed, thereby preventing the circuit breaker from being closed again.

[0030] The locking structure 32 includes a retractable connecting plate 33 connected to the locking plate 4, the other end of the connecting plate 33 is connected to a rotating plate 34, the rotating plate 34 is linked to a moving plate 35 slidably mounted on the panel of the isolating switch 1, and a fixed plate 36 is also provided on the panel of the isolating switch 1. The fixed plate 36 is provided with a limiting portion 37 for limiting the sliding stroke of the moving plate 35 on the panel of the isolating switch 1, so as to adjust and limit the moving stroke of the moving plate 35 and limit the insertion action of the operating handle to form an interlock.

[0031] The rotating plate 34 is forked, one end of which is connected to the connecting plate 33 , and the other end of which extends to the moving plate 35 and engages with the through groove on the moving plate 35 , thereby driving the moving plate 35 to move.

[0032] The movable plate 35 is slidably mounted on the panel of the isolating switch 1 through the sliding groove and the sliding cooperation with the fixing pin fixed on the panel of the isolating switch 1 .

[0033] The retractable structure of the connecting plate 33 is connected by two separately arranged connecting plates with wavy serrations. The retractable setting can be achieved through the relative sliding of the wavy serrations. After the two connecting plates are connected by bolts, they can slide relative to each other without rotating. It can adapt to disconnectors and circuit breakers with different installation distances, and is convenient for installing the interlocking mechanism.

[0034] The fixed plate 36 is provided with a first through slot 361 , and one end of the movable plate 35 passes through the fixed plate through the first through slot 361 and is engaged with the limiting portion 37 .

[0035] The limiting portion 37 is rotatably disposed on the fixed plate 36 in a vertical state, and includes a first limiting arm 371 linked to the operating handle and a second limiting arm 372 engaged with the movable plate 35 . The movable plate 35 is provided with a second through slot 351 engaged with the second limiting arm 372 .

[0036] A micro switch 14 is also provided on the panel of the isolating switch 1. The rotation of the isolating transmission plate 121 drives the moving plate 35 to move, thereby triggering the micro switch 14 when the isolating switch 1 is not closed.

[0037] A fifth through slot 111 is provided on the panel of the isolating switch 1, and a moving arm 352 is provided on the moving plate 35, which is linked with the isolating transmission plate 121 through the fifth through slot 111. The moving arm 352 abuts against the micro switch 14 to trigger the micro switch 14 when the isolating switch 1 is not closed, and is separated from the micro switch 14 after the operating handle is pulled out to close the switch.

[0038] The setting of the micro switch 14 can control the power-on state of the circuit breaker. When the isolating switch is not closed, the movable plate 35 triggers the micro switch, and the micro switch 14 sends a signal to keep the circuit breaker in the power-off state. Only after the isolating switch is closed and the movable plate 35 is separated from the micro switch 14, can the circuit breaker be powered on and the opening and closing actions be performed.

[0039] A closing rotating plate 122 is sleeved on the closing operating shaft 12, a grounding rotating plate 132 is sleeved on the grounding operating shaft 13, and a third through slot 112 and a fourth through slot 114 are provided on the panel of the isolating switch 1. A first sliding plate 113 is slidably provided in the third through slot 112, and the sliding baffle 31 is driven to move toward the grounding operating shaft 13 through the closing rotating plate 122. A second sliding plate 115 is slidably provided in the fourth through slot 114, and the sliding baffle 31 is driven to move toward the closing operating shaft 12 through the grounding rotating plate 132.

[0040] One end of the first sliding plate 113 and the second sliding plate 115 extends to the inner side of the panel, and the closing rotating plate 122 and the grounding rotating plate 132 are arranged in a cam shape. The closing rotating plate 122 and the grounding rotating plate 132 push the first sliding plate 113 and the second sliding plate 115 to move through the rotation action.

[0041] When the disconnector 1 is not closed, the isolation transmission plate 121 restricts the movable plate 35 by abutting against the movable arm 352, and locks the position of the movable plate 35-rotating plate 34-connecting plate 33, so that the locking plate 4 is engaged with the closing connecting rod. At this time, the circuit breaker 2 cannot be closed, and the disconnector 1 can be grounded.

[0042] When the isolating switch 1 is closed, the operating handle is inserted to rotate the closing operating shaft 12, and the closing rotating plate 122 rotates counterclockwise to push the first sliding plate 113 to drive the sliding baffle 31 to move, and the end of the sliding baffle 31 moves to the top of the grounding operating shaft 13 to lock the grounding operating shaft 13 to prevent personnel from misoperating the grounding operating shaft 13. After the closing action of the isolating switch 1 is completed, the moving plate 35 in the locking structure 32 is pushed by the first limit arm 371 driven by the insertion of the operating handle to slide on the panel of the isolating switch 1, and the isolation transmission plate 121 releases the restriction on the moving plate 35, and the moving plate 35 moves in the fifth through groove 111, and the moving plate 35 drives the rotating plate 34 to rotate, and the rotating plate 34 shortens the length of the connecting plate 33, and the connecting plate 33 drives the locking plate 4 to rotate and release the clamping connection with the closing connecting plate 231, so that the circuit breaker 2 can be closed, and the micro switch 14 switches from the trigger state to the disconnected state, and sends a signal to the external control module, so that the circuit breaker is energized to perform effective closing and opening actions.

[0043] After the circuit breaker 2 is closed, the driving sleeve 221 on the transmission shaft 22 rotates, the driving block 222 abuts against the pushing portion 42 of the locking plate 4 to form a limit, the connecting plate 23 drives the rotating plate 34 to rotate counterclockwise, and the rotating plate 34 drives the movable plate 35 to slide upward, and the first limiting arm 371 limits the closing operating shaft 12. At this time, the operating handle cannot be inserted into the closing rotating shaft 12 to close the isolating switch 1.

[0044] After the circuit breaker 2 is opened, the operating handle can be inserted to perform the grounding operation of the disconnector 1.

[0045] When the operating handle operates the grounding operating shaft 13 to ground the isolating switch 1, the sliding baffle 31 is driven by the grounding rotating plate 132 to move above the closing operating shaft 12, and the isolating switch 1 cannot be operated to close.

[0046] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A circuit breaker isolating switch interlocking mechanism, the isolating switch comprising an isolating switch panel, a closing operation shaft, a grounding operation shaft and an isolating transmission plate, the circuit breaker comprising a circuit breaker panel, a transmission shaft and a closing knob, characterized in that: The interlocking mechanism includes a sliding baffle plate provided on the disconnector panel for shielding one of a closing operating shaft and a grounding operating shaft. The closing operating shaft is linked with a locking structure for locking a closing knob. The locking structure is used to drive a locking plate provided on the circuit breaker panel. When the disconnector is not closed, the locking structure drives the locking plate to lock the closing knob so that it cannot rotate. When the disconnector is closed and the operating handle is pulled out, the locking plate is unlocked by the locking structure and the closing knob and can be rotated to close the circuit breaker. After the disconnector is closed, the sliding baffle plate shields the grounding operating shaft and cannot be operated. After the circuit breaker is closed, the operating handle cannot be inserted into the closing operating shaft.

2. The circuit breaker isolating switch interlocking mechanism according to claim 1, characterized in that: The closing knob is provided with a closing connecting plate, the closing connecting plate is provided with a first limiting groove, the locking plate is rotatably arranged on the circuit breaker panel, and one end of the locking plate is provided with a second limiting groove which is engaged with the limiting groove when the isolating switch is not closed.

3. The circuit breaker isolating switch interlocking mechanism according to claim 1, characterized in that: The other end of the locking plate is provided with a pushing part for linkage with the transmission shaft, the fixed sleeve on the transmission shaft is provided with a driving sleeve, the driving sleeve is provided with a driving block, and the driving block abuts against the pushing part through a rotating action when the circuit breaker is closed.

4. The circuit breaker isolating switch interlocking mechanism according to claim 1, characterized in that: The locking structure includes a connecting plate connected to the locking plate and is retractable, the other end of the connecting plate is connected to a rotating plate, the rotating plate is linked to a moving plate slidably mounted on the isolating switch panel, the isolating switch panel is also provided with a fixed plate, the fixed plate is provided with a limit portion for limiting the sliding travel of the moving plate on the isolating switch panel.

5. The circuit breaker isolating switch interlocking mechanism according to claim 4, characterized in that: The fixed plate is provided with a first through slot, and one end of the movable plate passes through the fixed plate through the first through slot and is engaged with the limiting portion.

6. The circuit breaker isolating switch interlocking mechanism according to claim 4, characterized in that: The limiting part is rotatably arranged on the fixed plate in a vertical state, and comprises a first limiting arm linked with the operating handle and a second limiting arm clamped with the movable plate, and the movable plate is provided with a second through groove clamped with the second limiting arm.

7. The circuit breaker isolating switch interlocking mechanism according to claim 4, characterized in that: The isolating switch panel is also provided with a micro switch, and the rotation of the isolating transmission plate drives the moving plate to move, thereby triggering the micro switch when the isolating switch is not in a closed state.

8. The circuit breaker isolating switch interlocking mechanism according to claim 7, characterized in that: A fifth through slot is provided on the isolating switch panel, and a movable arm is provided on the movable plate which is linked with the isolating transmission plate through the fifth through slot. The movable arm abuts against the micro switch to trigger the micro switch when the isolating switch is not closed, and is separated from the micro switch after the operating handle is pulled out to close the switch.

9. The circuit breaker isolating switch interlocking mechanism according to claim 1, characterized in that: The closing operating shaft is sleeved with a closing rotating plate, the grounding operating shaft is sleeved with a grounding rotating plate, the isolating switch panel is provided with a third through slot and a fourth through slot, a first sliding plate is slidably provided in the third through slot and driven by the closing rotating plate to move the sliding baffle toward the direction of the grounding operating shaft, and a second sliding plate is slidably provided in the fourth through slot and driven by the grounding rotating plate to move the sliding baffle toward the direction of the closing operating shaft.

10. The circuit breaker isolating switch interlocking mechanism according to claim 9, characterized in that: One end of the first sliding plate and the second sliding plate extends to the inner side of the panel, and the closing rotating plate and the grounding rotating plate are arranged in a cam shape. The closing rotating plate and the grounding rotating plate push the first sliding plate and the second sliding plate to move through a rotating action.

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