Isolation of upper and lower circuit breaker switch cabinet under pressure type door interlocking mechanism

Abstract

The application relates to a lower-pressing type cabinet door interlocking mechanism of an upper-isolation and lower-circuit-breaker switch cabinet, which comprises a lower door and an interlocking assembly. The interlocking assembly comprises a bent plate, an interlocking plate, a spring, an interlocking rod, a grounding lower-door interlocking group, a circuit-breaker lower-door interlocking group and a circuit-breaker opening interlocking group. When a grounding operating shaft rotates to opening, the grounding lower-door interlocking group limits the upward movement of the interlocking plate and can realize the locking of the grounding operating shaft and the lower door. When a circuit-breaker operating shaft rotates to opening, the circuit-breaker lower-door interlocking group limits the upward movement of the interlocking plate and realizes the locking of the circuit-breaker operating shaft and the lower door. When the circuit-breaker operating shaft rotates to closing, the circuit-breaker opening interlocking group moves along with the interlocking rod, and the circuit-breaker opening interlocking group can limit the rotation of a circuit-breaker operating mechanism half shaft to an opening position. The application has the advantages of simple structure, stable and reliable performance, convenient operation, low cost and safety and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switch cabinet, in particular to an upper isolation and lower circuit breaker switch cabinet plug-in type cabinet door interlocking mechanism. BACKGROUND

[0002] The main function of the switch cabinet is to open and close, control and protect the electrical equipment in the process of power generation, power transmission, power distribution and power conversion in the power system. The components in the switch cabinet mainly include circuit breakers, disconnectors, load switches, operating mechanisms, transformers and various protection devices. It is mainly suitable for power plants, substations, petrochemical industry, metallurgy and steel rolling, light industry and textile industry, factory and mine enterprises, residential areas, high-rise buildings and other different occasions. In the power transmission and transformation system, the switch cabinet is a very important electrical equipment in the power system. Once misoperation occurs, it may cause equipment damage, power system failure, even endanger personal safety, therefore, the switch cabinet must have perfect and reliable "five prevention interlocking" function to ensure the safe operation of the power grid and personal safety.

[0003] The switch cabinet is provided with a disconnector, a disconnector operating mechanism, a circuit breaker and a circuit breaker operating mechanism. The disconnector operating mechanism controls the operation of the knife lever in the disconnector among the isolation closing, isolation opening (also ground opening) and ground closing positions. The circuit breaker operating mechanism controls the opening and closing operation of the vacuum bubble in the circuit breaker. In order to ensure the safety during operation, the upper isolation and lower circuit breaker switch cabinet needs to ensure the following two points: 1. When the cabinet door is in the closed state, the ground operating shaft should be rotated to the ground opening position, and the cabinet door should not be opened; 2. When the cabinet door is in the open state, the circuit breaker should not be opened.

[0004] When the switch cabinet is running, the cabinet door should be closed, and the live parts are enclosed in the cable chamber to protect personal safety. The switch cabinet door interlocking mechanism is a set of interlocking device arranged between the cabinet door and the three-position disconnector and vacuum circuit breaker to prevent misentry into the live compartment. When the switch cabinet is powered on, the cabinet door interlocking mechanism is correctly locked and cannot be opened unless it is forcibly damaged. The existing cabinet door interlocking mechanism has unreasonable structure design and poor overall strength. When the operating force is too large (forcibly pulling the door), it may cause the cabinet door interlocking mechanism to fail and cause safety accidents, so the cabinet door interlocking mechanism has the defects of unreliable performance and low safety. SUMMARY

[0005] The present application aims to overcome the defects of the prior art, and provides an upper isolation and lower circuit breaker switch cabinet lower pressing type cabinet door interlocking mechanism with simple structure, stable and reliable performance, convenient operation, low cost and safety.

[0006] To achieve the above object, the application adopts a lower-pressing type cabinet door interlocking mechanism of an upper-isolation and lower-break switchgear, which comprises a lower door, an interlocking assembly arranged on an isolation operating mechanism and a circuit breaker operating mechanism, the interlocking assembly comprising a bent plate arranged on the isolation operating mechanism, an interlocking plate slidingly arranged on the bent plate, a spring arranged between the interlocking plate and the bent plate, an interlocking rod arranged in linkage with the interlocking plate and used for locking the lower door, a lower-door interlocking set cooperating with a grounding operating shaft of the isolation operating mechanism, a circuit breaker lower-door interlocking set cooperating with a circuit breaker operating shaft of the circuit breaker operating mechanism, and a circuit breaker opening interlocking set cooperating with the interlocking rod. When the grounding operating shaft is rotated to an opening position, the lower-door interlocking set limits upward movement of the interlocking plate and can lock the grounding operating shaft and the lower door. When the circuit breaker operating shaft is rotated to an opening position, the circuit breaker lower-door interlocking set limits upward movement of the interlocking plate and can lock the circuit breaker operating shaft and the lower door. When the circuit breaker operating shaft is rotated to a closing position, the circuit breaker opening interlocking set moves with the interlocking rod, and the circuit breaker opening interlocking set can limit rotation of a circuit breaker opening half shaft of the circuit breaker operating mechanism to an opening position.

[0007] The cabinet door interlocking mechanism has the advantages of simple structure, stable and reliable performance, convenient operation, low cost, safety and reliability, and the like.

[0008] Particularly, the interlock group of the grounding door comprises a cam linked to the grounding operation shaft, a sliding baffle linked to the isolation operation mechanism and matched with the interlock plate, a limiting piece on the sliding baffle matched with the push rod on the cam, the push rod moving with the cam and abutting against the limiting piece to form the linkage between the push rod and the sliding baffle, the sliding baffle moving with the push rod and abutting against the interlock plate to form the limiting between the sliding baffle and the interlock plate. When the grounding operation shaft rotates to the open position, the cam rotates with the grounding operation shaft, the push rod on the cam pushes the sliding baffle to move, the sliding baffle abuts against the interlock plate to limit the upward movement of the interlock plate and the interlock rod, and the interlock rod abuts against the lower door to prevent the lower door from being opened.

[0009] Particularly, the interlock plate has an arc-shaped tab matched with the sliding baffle, and the sliding baffle abuts against the arc-shaped tab to form the limiting between the arc-shaped tab and the sliding baffle. The arc-shaped tab matched with the sliding baffle prevents the interlock plate and the sliding baffle from being stuck, and ensures the reliable transmission between the interlock plate and the sliding baffle.

[0010] Particularly, the interlock group of the lower door of the circuit breaker comprises a circuit breaker interlock plate linked to the circuit breaker operation shaft, a driving plate linked to the interlock plate, a limiting plate rotatably arranged on the driving plate and matched with the bent plate, and a tension spring arranged between the limiting plate and the bent plate. The circuit breaker operation shaft has a stopper linked to the circuit breaker interlock plate. When the circuit breaker operation shaft rotates to the closed position, the circuit breaker interlock plate moves with the stopper and drives the limiting plate to rotate. When the circuit breaker operation shaft rotates to the open position, the limiting plate abuts against the bent plate to limit the upward movement of the driving plate, the interlock plate and the interlock rod, and the interlock rod abuts against the lower door to prevent the lower door from being opened. When the circuit breaker operation shaft rotates to the closed position, the stopper on the circuit breaker operation shaft drives the circuit breaker interlock plate to move upward, the circuit breaker interlock plate drives the limiting plate to rotate, the driving plate and the interlock plate are no longer limited by the limiting plate, the interlock rod can move upward, the lower door is no longer limited by the interlock rod, and the lower door can be opened.

[0011] Particularly, one end of the limiting plate has an arc-shaped abutting surface matched with the bent plate, and the other end of the limiting plate has an abutting part matched with the circuit breaker interlock plate. The limiting plate is rotatably arranged on the positioning bolt on the driving plate. The abutting part on the limiting plate matched with the circuit breaker interlock plate ensures the reliable transmission between the limiting plate and the circuit breaker interlock plate. The arc-shaped abutting surface matched with the bent plate prevents the limiting plate from being stuck when the circuit breaker interlock plate drives the limiting plate to rotate.

[0012] Particularly, the interlocking plate is connected with the guide rod, so that reliable transmission of the interlocking plate and the driving plate can be ensured, and the working reliability of the cabinet door interlocking mechanism is improved.

[0013] Particularly, the interlocking plate is connected with the guide rod, so that reliable transmission of the interlocking plate and the driving plate can be ensured, and the working reliability of the cabinet door interlocking mechanism is improved.

[0014] Particularly, the interlocking plate is connected with the guide rod, so that reliable transmission of the interlocking plate and the driving plate can be ensured, and the working reliability of the cabinet door interlocking mechanism is improved.

[0015] Particularly, the interlocking plate is connected with the guide rod, so that reliable transmission of the interlocking plate and the driving plate can be ensured, and the working reliability of the cabinet door interlocking mechanism is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective view of the embodiment of the present application.

[0017] Figure 2 It is a front view of the embodiment of the present application without the circuit breaker interlocking plate.

[0018] Figure 3 It is a perspective view of the interlocking assembly of the embodiment of the present application.

[0019] Figure 4 It is an assembly view of the interlocking plate and the sliding baffle of the embodiment of the present application. DETAILED DESCRIPTION

[0020] As Figures 1-4 shown in the figure, the embodiment of the application is a lower pressing type cabinet door interlocking mechanism of upper isolation and lower circuit breaker switch cabinet, which comprises a lower door 10, an interlocking assembly 20 arranged on an isolation operating mechanism 11 and a circuit breaker operating mechanism 12, the interlocking assembly 20 comprises a bent plate 21 arranged on the isolation operating mechanism 11, an interlocking plate 22 slidingly arranged on the bent plate 21, a spring 23 arranged between the interlocking plate 22 and the bent plate 21, an interlocking rod 24 arranged in linkage with the interlocking plate 22 and used for locking the lower door 10, a lower door interlocking set 30 matched with a grounding operating shaft 110 of the isolation operating mechanism 11, a circuit breaker lower door interlocking set 40 matched with a circuit breaker operating shaft 120 of the circuit breaker operating mechanism 12, and a circuit breaker opening interlocking set 50 matched in linkage with the interlocking rod 24, when the grounding operating shaft 110 rotates to an opening position, the lower door interlocking set 30 limits the upward movement of the interlocking plate 22, and the grounding operating shaft 110 and the lower door 10 can be locked; when the circuit breaker operating shaft 120 rotates to an opening position, the circuit breaker lower door interlocking set 50 limits the upward movement of the interlocking plate 22, and the circuit breaker operating shaft 120 and the lower door 10 can be locked; when the circuit breaker operating shaft 120 rotates to a closing position, the circuit breaker opening interlocking set 50 acts with the interlocking rod 24, and the circuit breaker opening interlocking set 50 can limit the rotation of a circuit breaker opening half shaft 121 of the circuit breaker operating mechanism 12 to an opening position.

[0021] As Figure 1 , 3 shown in the figure, the lower door interlocking set 30 comprises a cam 31 arranged in linkage on the grounding operating shaft 110 and a sliding baffle 32 slidingly arranged on the isolation operating mechanism 11 and matched with the interlocking plate 22, the cam 31 is provided with a push rod 311 matched with the sliding baffle 32, the sliding baffle 32 is provided with a limiting piece 321 matched with the push rod 311, the push rod 311 acts with the cam 31 and can abut against the limiting piece 321, and forms linkage between the push rod 311 and the sliding baffle 32, the sliding baffle 32 acts with the push rod 311 and can abut against the interlocking plate 22, and forms limiting between the sliding baffle 32 and the interlocking plate 22. When the grounding operating shaft rotates to an opening position, the cam rotates with the grounding operating shaft, the push rod on the cam pushes the sliding baffle to act, the sliding baffle abuts against the interlocking plate, and can limit the upward movement of the interlocking plate and the interlocking rod, the interlocking rod abuts against the lower door, and the lower door cannot be opened. The interlocking plate 22 is provided with an arc-shaped tab 221 matched with the sliding baffle 32, the sliding baffle 32 can abut against the arc-shaped tab 221, and forms limiting between the arc-shaped tab 221 and the sliding baffle 32. The arc-shaped tab and the sliding baffle are matched, the interlocking plate and the sliding baffle will not be stuck and deadlocked, and the transmission between the interlocking plate and the sliding baffle can be more reliable.

[0022] AsFigures 1-3 As shown, the circuit breaker lower door interlocking set 40 comprises a circuit breaker interlocking plate 41 linked with the circuit breaker operating shaft 120, a driving plate 42 linked with the interlocking plate 22, a limiting plate 43 rotatably arranged on the driving plate 42 and limited with the bent plate 21, a tension spring 44 arranged between the limiting plate 43 and the bent plate 21. The circuit breaker operating shaft 120 is linked with a stopper 1201 which cooperates with the circuit breaker interlocking plate 41. When the circuit breaker operating shaft rotates to the closing position, the circuit breaker interlocking plate 41 moves with the stopper 1201 and drives the limiting plate 43 to rotate. When the circuit breaker operating shaft rotates to the opening position, the limiting plate abuts against the bent plate, the limiting plate limits the upward movement of the driving plate, the interlocking plate and the interlocking rod, and the interlocking rod abuts against the lower door so that the lower door cannot be opened. When the circuit breaker operating shaft rotates to the closing position, the stopper on the circuit breaker operating shaft drives the circuit breaker interlocking plate to move upward, the circuit breaker interlocking plate drives the limiting plate to rotate, the driving plate and the interlocking plate are no longer limited by the limiting plate, the interlocking rod can move upward, the lower door is no longer limited by the interlocking rod, and the lower door can be opened. The limiting plate 43 has an arc abutting surface 431 at one end which cooperates with the bent plate 21, and has an abutting portion 432 at the other end which cooperates with the circuit breaker interlocking plate 41. The limiting plate 43 is rotatably arranged on the positioning bolt 421 of the driving plate 42. The abutting portion on the limiting plate cooperates with the circuit breaker interlocking plate, so that the transmission between the limiting plate and the circuit breaker interlocking plate is more reliable. The arc abutting surface cooperates with the bent plate, and when the circuit breaker interlocking plate drives the limiting plate to rotate, the arc abutting surface of the limiting plate will not be stuck with the bent plate. The interlocking plate 22 is linked with a guide rod 222, the bent plate 21 is provided with a through hole 211 through which the guide rod 222 passes, and one end of the guide rod 222 passes through the through hole 211 and is connected to the driving plate 42, and constitutes the linkage between the driving plate 42 and the guide rod 222. The interlocking plate is connected through the guide rod, so that the reliable transmission between the interlocking plate and the driving plate is ensured, and the working reliability of the cabinet door interlocking mechanism is improved.

[0023] As shown, the circuit breaker lower door interlocking set 40 comprises a circuit breaker interlocking plate 41 linked with the circuit breaker operating shaft 120, a driving plate 42 linked with the interlocking plate 22, a limiting plate 43 rotatably arranged on the driving plate 42 and limited with the bent plate 21, a tension spring 44 arranged between the limiting plate 43 and the bent plate 21. The circuit breaker operating shaft 120 is linked with a stopper 1201 which cooperates with the circuit breaker interlocking plate 41. When the circuit breaker operating shaft rotates to the closing position, the circuit breaker interlocking plate 41 moves with the stopper 1201 and drives the limiting plate 43 to rotate. When the circuit breaker operating shaft rotates to the opening position, the limiting plate abuts against the bent plate, the limiting plate limits the upward movement of the driving plate, the interlocking plate and the interlocking rod, and the interlocking rod abuts against the lower door so that the lower door cannot be opened. When the circuit breaker operating shaft rotates to the closing position, the stopper on the circuit breaker operating shaft drives the circuit breaker interlocking plate to move upward, the circuit breaker interlocking plate drives the limiting plate to rotate, the driving plate and the interlocking plate are no longer limited by the limiting plate, the interlocking rod can move upward, the lower door is no longer limited by the interlocking rod, and the lower door can be opened. The limiting plate 43 has an arc abutting surface 431 at one end which cooperates with the bent plate 21, and has an abutting portion 432 at the other end which cooperates with the circuit breaker interlocking plate 41. The limiting plate 43 is rotatably arranged on the positioning bolt 421 of the driving plate 42. The abutting portion on the limiting plate cooperates with the circuit breaker interlocking plate, so that the transmission between the limiting plate and the circuit breaker interlocking plate is more reliable. The arc abutting surface cooperates with the bent plate, and when the circuit breaker interlocking plate drives the limiting plate to rotate, the arc abutting surface of the limiting plate will not be stuck with the bent plate. The interlocking plate 22 is linked with a guide rod 222, the bent plate 21 is provided with a through hole 211 through which the guide rod 222 passes, and one end of the guide rod 222 passes through the through hole 211 and is connected to the driving plate 42, and constitutes the linkage between the driving plate 42 and the guide rod 222. The interlocking plate is connected through the guide rod, so that the reliable transmission between the interlocking plate and the driving plate is ensured, and the working reliability of the cabinet door interlocking mechanism is improved. Figure 1 , 2As shown, the breaker tripping interlock set 50 comprises a lower door interlock plate 51 connected with the interlock lever 24, a connecting plate 52 connected with the lower door interlock plate 51, a toggle plate 53 rotatably arranged on the breaker operating mechanism 12, a tripping push plate 122 arranged on the tripping half shaft 121, and a locking plate 54 rotatably arranged on the breaker operating mechanism 12 and matched with the tripping push plate 122. One end of the toggle plate 53 is connected with the connecting plate 52, and the toggle plate 53 and the connecting plate 52 are matched with each other. The toggle plate 53 moves with the connecting plate 52 and can abut against one end of the locking plate 54, and the locking plate 54 and the toggle plate 53 are matched with each other. The other end of the locking plate 54 moves with the toggle plate 53 and can abut against the tripping push plate 122, and the tripping push plate 122 and the locking plate 54 are matched with each other. When the interlock lever moves upward, the interlock lever drives the lower door interlock plate to move, the lower door interlock plate drives the locking plate to rotate through the connecting plate and the toggle plate, one end of the locking plate abuts against the tripping push plate, so that the rotation of the tripping half shaft is limited, and the breaker is prevented from closing when the door is opened, thereby improving the safety performance of the door interlock mechanism. One end of the locking plate 54 has an abutting arc surface 541 matched with the toggle plate 53. The abutting arc surface is arranged on the locking plate, which can prevent the locking plate and the toggle plate from being stuck and deadlocked, and improve the transmission reliability of the locking plate and the toggle plate. In particular, one end of the interlock lever 24 is connected with the interlock plate 22, and the other end of the interlock lever 24 is provided with an adjusting screw 241 matched with the lower door 10. Rotating the adjusting screw can adjust the length of the interlock lever, which can ensure that the interlock lever and the lower door are reliably interlocked, and the length of the interlock lever can be adjusted according to different specifications of switch cabinets, so that the application range of the door interlock mechanism is wider.

[0024] The cabinet door interlocking mechanism adopts a down-pressing structure design, and the interlocking is more reliable and has higher strength, so that the situation that the interlocking mechanism fails due to excessive operating force can be avoided. The grounding door interlocking group of the cabinet door interlocking mechanism can realize the interlocking of the isolation operating mechanism and the lower door, and the grounding door interlocking group has simple structure, better strength and better interlocking reliability. When the grounding operating shaft rotates to the open position, the grounding door interlocking group can limit the upward movement of the interlocking rod, so that the interlocking rod can reliably lock the lower door, and the lower door cannot be opened. The circuit breaker lower door interlocking group can realize the interlocking of the lower door and the circuit breaker operating mechanism. When the circuit breaker operating shaft rotates to the open position, the circuit breaker lower door interlocking group can limit the upward movement of the interlocking plate and the interlocking rod, the interlocking rod abuts against the lower door, and the lower door cannot be opened. When the circuit breaker operating shaft rotates to the closed position, the interlocking plate is no longer limited by the circuit breaker lower door interlocking assembly, the interlocking plate and the interlocking rod move upward, the circuit breaker opening interlocking group moves upward with the interlocking rod, the circuit breaker opening interlocking group abuts against the opening half shaft, the opening half shaft cannot rotate, so that the circuit breaker cannot be opened, the lower door is limited by the interlocking rod, and the lower door can be opened. In use, the grounding operating shaft is first rotated to the closed position, and then the circuit breaker operating shaft is rotated to the closed position, the circuit breaker opening interlocking group limits the action of the opening half shaft, the circuit breaker remains in the closed position, and the lower door can be opened. Therefore, the cabinet door interlocking mechanism has the advantages of simple structure, stable and reliable performance, convenient operation, low cost and safety and reliability.

Claims

1. A lower press type cabinet door interlocking mechanism of an upper isolation and lower circuit breaker switchgear, comprising a lower door, an interlocking assembly arranged on an isolation operating mechanism and a circuit breaker operating mechanism, characterized in that The interlocking assembly comprises a bent plate arranged on the isolation operating mechanism, an interlocking plate slidingly arranged on the bent plate, a spring arranged between the interlocking plate and the bent plate, an interlocking rod arranged in linkage with the interlocking plate and used for locking the lower door, a grounding door interlocking group matched with a grounding operating shaft of the isolation operating mechanism, a circuit breaker lower door interlocking group matched with a circuit breaker operating shaft of the circuit breaker operating mechanism, and a circuit breaker opening interlocking group matched in linkage with the interlocking rod.

2. The top-segregated bottom-circuit breaker switchgear lower push-type cabinet door interlocking mechanism according to claim 1, characterized in that: The interlocking plate has an arc-shaped tab matched with the sliding block.

3. The top-segregated bottom-circuit breaker switchgear bottom-pressing type cabinet door interlocking mechanism according to claim 1, characterized in that: One end of the limiting plate has an arc-shaped abutting surface matched with the bent plate, and the other end of the limiting plate has an abutting part matched with the circuit breaker interlocking plate. The limiting plate is rotationally arranged on a positioning bolt of the driving plate.

4. The top-segregated bottom-circuit breaker switchgear bottom-pressing type cabinet door interlocking mechanism according to claim 1, characterized in that: The interlocking plate is connected with the guide rod, the guide rod is provided with a through hole, one end of the guide rod passes through the through hole and is connected with the driving plate, and the driving plate and the guide rod are connected.

5. The top-segregated bottom-circuit breaker switchgear bottom-pressing type cabinet door interlocking mechanism according to claim 1, characterized in that: The circuit breaker opening interlocking group comprises a lower door interlocking plate connected with the guide rod, a connecting plate connected with the lower door interlocking plate, a rotating plate connected with the circuit breaker operating mechanism, an opening push plate connected with the opening half shaft, a locking plate connected with the circuit breaker operating mechanism and matched with the opening push plate, one end of the rotating plate is connected with the connecting plate, the rotating plate and the connecting plate are connected, the rotating plate moves with the connecting plate and can abut against one end of the locking plate, the locking plate and the rotating plate are connected, the other end of the locking plate moves with the rotating plate and can abut against the opening push plate, and the opening push plate and the locking plate are limited.

6. The top-segregated bottom-circuit breaker switchgear lower press-type cabinet door interlocking mechanism according to claim 5, characterized in that: One end of the locking plate is provided with an abutting arc surface matched with the rotating plate.

7. The top-segregated bottom-circuit breaker switchgear bottom-press type cabinet door interlocking mechanism according to claim 1, characterized in that: One end of the interlocking rod is connected with the interlocking plate, and the other end of the interlocking rod is provided with an adjusting bolt matched with the lower door.

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