Linkage switch and circuit breaker cabinet

Abstract

The application relates to the technical field of ring network cabinet distribution switches, in particular to a linkage switch and a circuit breaker cabinet. The linkage switch comprises an arc extinguishing chamber and a three-position switch. A movable contact pull rod of a movable contact of the arc extinguishing chamber is provided with a transmission rotating shaft. An isolation static contact of the three-position switch is conductively connected with the movable contact of the arc extinguishing chamber through a soft connection. The isolation static contact is in transmission connection with the transmission rotating shaft. An isolation movable contact is used for a linkage operating mechanism. A closing push structure and an opening push structure are relatively arranged on the isolation static contact on a movement path of the isolation movable contact. When the isolation movable contact moves in an isolation closing direction and an isolation opening direction, the isolation movable contact can be in push cooperation with the closing push structure and the opening push structure to drive the isolation static contact to move. The isolation static contact drives the transmission rotating shaft to rotate, and further drives the movable contact of the arc extinguishing chamber to open and close. The linkage switch only needs to be provided with one operating mechanism, and the structure is simple and the control is reliable.

Description

Technical Field

[0001] This invention relates to the field of ring main unit power distribution switch technology, and in particular to a linkage switch and circuit breaker cabinet. Background Technology

[0002] Currently, the basic cabinet type used for interrupting short-circuit current in ring main units is the circuit breaker cabinet. Most circuit breaker cabinet designs employ a series arrangement of a vacuum interrupter and a three-position switch. The vacuum interrupter is used to interrupt and close short-circuit current or load current, while the three-position switch is mainly used for isolation and grounding. The vacuum interrupter and the three-position switch are operated by independent mechanisms to achieve opening and closing. Since the three-position switch does not have the capability to interrupt short-circuit current or load current, the operating procedures require: when opening, the vacuum interrupter should be opened first, followed by the three-position switch; when closing, the three-position switch should be closed first, followed by the vacuum interrupter. Because the vacuum interrupter operating mechanism and the three-position switch operating mechanism are structurally independent, current technology mainly involves setting up complex interlocking devices between them to avoid misoperation. On the one hand, this is inconsistent with the traditional three-position operation habits of SF6 switches (closing, opening, and grounding), which brings inconvenience to the operation and maintenance of the product; on the other hand, in the event of interlock failure, there is a possibility of misoperation, which brings unsafe factors to the operation of the equipment, and the two independent operating mechanisms and complex interlocking devices will inevitably lead to high costs.

[0003] An existing circuit breaker cabinet structure, as shown in Chinese invention patent application CN115347495A, includes a sealed gas chamber. Inside the sealed gas chamber are a vacuum interrupter chamber connected in series with a flexible connection and a three-position switch. The moving contact of the three-position switch is equipped with a first transmission system consisting of gears, racks, and a first drive shaft. The first drive shaft is linked to the first output shaft of the operating mechanism. Under the drive of the operating mechanism, the first drive shaft rotates, causing the gears to rotate, which in turn drives the rack and moves the moving contact up and down to achieve the closing, opening, and grounding of the three-position switch. The vacuum moving contact of the vacuum interrupter chamber is equipped with a second transmission system consisting of a moving guide rod, a second drive shaft, a drive crank arm, and a contact pressure spring. The second drive shaft is linked to the second output shaft of the operating mechanism. Under the drive of the operating mechanism, the second drive shaft rotates, causing the drive crank arm to rotate. The drive crank arm, through a mating groove, moves the vacuum moving contact up and down to achieve opening and closing.

[0004] The aforementioned patent document describes the circuit breaker cabinet as having a separate transmission system for the vacuum interrupter chamber and the three-position switch. The two transmission systems are linked to the first and second output shafts of the operating mechanism, respectively. Although they share a single operating mechanism, they are essentially equivalent to having two operating mechanisms, which makes the structure of the operating mechanism complex. Furthermore, in actual operation, it is necessary to control the opening and closing sequence of the interrupter chamber and the three-position switch, making the control more difficult. Summary of the Invention

[0005] The purpose of this invention is to provide a linkage switch to solve the problems of complex operating mechanism structure and high control difficulty of existing linkage switches; the purpose of this invention is also to provide a circuit breaker cabinet to solve the problems of complex operating mechanism structure and high control difficulty of existing circuit breaker cabinet linkage switches, which leads to high risk of misoperation during opening and closing of the circuit breaker cabinet and high cost.

[0006] To achieve the above objectives, the linkage switch of the present invention adopts the following technical solution:

[0007] A linkage switch includes an arc-extinguishing chamber and a three-position switch. The moving contact rod of the arc-extinguishing chamber's moving contact is equipped with a drive shaft, and the rotation of the drive shaft drives the arc-extinguishing chamber's moving contact to open and close. The isolating stationary contact of the three-position switch is electrically connected to the arc-extinguishing chamber's moving contact via a flexible connection. The isolating stationary contact is driven by the drive shaft. The isolating moving contact of the three-position switch is used to link the operating mechanism. The grounding stationary contact of the three-position switch is located on the movement path of the isolating moving contact. For devices equipped with a closing push structure and a opening push structure, when the isolating moving contact moves in the direction of isolating closing, it pushes the closing push structure and drives the isolating stationary contact to move in the forward direction. The isolating stationary contact drives the transmission shaft to rotate, thereby pulling the arc-extinguishing chamber moving contact to the closing position. When the isolating moving contact moves in the direction of isolating opening, it pushes the opening push structure and drives the isolating stationary contact to move in the reverse direction. The isolating stationary contact drives the transmission shaft to rotate, and after pulling the arc-extinguishing chamber to complete the opening, the isolating moving contact separates from the isolating stationary contact and moves towards the isolation position.

[0008] Beneficial Effects: This invention proposes an improved linkage switch. Based on the transmission connection between the moving contact of the arc-extinguishing chamber and the transmission shaft, the isolating stationary contact of the three-position switch is also transmissionally connected to the transmission shaft. A closing push structure and a opening push structure are configured opposite each other on the moving contact of the isolating stationary contact along the movement path of the isolating moving contact. When the isolating moving contact moves towards the closing direction, it pushes the closing push structure and causes the isolating stationary contact to move forward. The isolating stationary contact drives the transmission shaft to rotate, thereby pulling the arc-extinguishing chamber moving contact to the closed position. When the isolating moving contact moves towards the opening direction, it pushes the opening push structure and causes the isolating stationary contact to move in the opposite direction. The isolating stationary contact drives the transmission shaft to rotate, and after the arc-extinguishing chamber is opened, the isolating moving contact separates from the isolating stationary contact and moves towards the isolation position. The interlocking switch requires only one operating mechanism to link the isolating moving contact of the three-position switch with the operating mechanism. Only the isolating moving contact needs to be moved; controlling one operating mechanism is sufficient to achieve the following: during closing, the three-position switch is first driven to close, then the arc-extinguishing chamber closes; during opening, the arc-extinguishing chamber is first driven to open, then the three-position switch opens. During grounding, the arc-extinguishing chamber remains in the open position, and the three-position switch is grounded, ensuring that both load current and short-circuit current are interrupted by the arc-extinguishing chamber. The interlocking switch operates in accordance with the traditional three-position SF6 switch, avoiding the risk of misoperation. Furthermore, requiring only one operating mechanism simplifies control, and the simple and reliable linkage structure between the arc-extinguishing chamber and the three-position switch significantly reduces the cost of the interlocking switch.

[0009] Furthermore, the isolating stationary contact is fixed relative to the transmission shaft and rotates with the transmission shaft, while the isolating moving contact is rotated.

[0010] Beneficial effects: By fixing the isolating stationary contact relative to the transmission shaft, the isolating stationary contact can rotate with the transmission shaft, while the isolating moving contact is rotated. This makes the transmission structure relatively simple and the transmission reliable.

[0011] Furthermore, the transmission shaft is equipped with a push-pull cam, which is connected to the moving contact rod through a mating groove and drives the opening and closing action of the brake.

[0012] Beneficial effects: By connecting the moving contact rod to the transmission shaft via a push-pull cam, only the contour line of the mating groove on the push-pull cam needs to be designed to accurately control the opening and closing action of the moving contact rod. The transmission structure is simple and the transmission is reliable.

[0013] Furthermore, the isolating stationary contact is a plate structure, including a main plate body that is parallel to or coincides with the rotation plane of the isolating moving contact. The main plate body has a contact plate surface that makes conductive contact with the isolating moving contact. On the contact plate surface, on opposite sides in the rotation direction of the isolating moving contact, there are protruding structures that protrude from the main plate body surface. The two protruding structures respectively constitute the closing push structure and the opening push structure.

[0014] Beneficial effects: The isolating stationary contact has a plate structure. On the contact plate surface of the main board, protruding structures are respectively set on both sides of the isolating moving contact in the direction of rotation to cooperate with the isolating moving contact during opening and closing. The overall structure of the isolating stationary contact is simple, and the two protruding structures are convenient and reliable to cooperate with the isolating moving contact during opening and closing.

[0015] Furthermore, the protruding structure is an integral part of the main board body and is located at both ends of the main board body. One end of the flexible connection is connected to the side of the isolation stationary contact of the protruding structure at one end of the main board body in the direction of rotation.

[0016] Beneficial effects: The protruding structure is integrated with the main board, which gives the protruding structure and the main board a high connection strength, preventing the protruding structure from loosening or deforming. This further ensures that the protruding structure and the isolating moving contact form a reliable push-fit. The integrated design of the protruding structure and the main board also makes the lateral area of ​​the isolating stationary contact in the direction of rotation larger, making the connection between the soft connection and the isolating stationary contact more convenient and reliable.

[0017] Furthermore, one end of the flexible connection is connected to the side of the protruding structure that constitutes the tripping push structure.

[0018] Beneficial effects: In this way, during the opening and closing action of the isolating stationary contact as it swings with the isolating moving contact, the flexible connection is always positioned above and to the side of the isolating stationary contact. The end of the flexible connection connected to the isolating stationary contact does not need to wrap around the isolating stationary contact, thus avoiding interference between components and preventing damage to the flexible connection, thereby improving the reliability and service life of the switchgear.

[0019] Furthermore, at least one of the closing push structure and the opening push structure has a sloped or curved side facing the other, forming a flared structure.

[0020] Beneficial effects: During the rotation of the isolating moving contact, it makes conductive contact with the main board of the isolating stationary contact to achieve closing. The main board is located between the closing push structure and the opening push structure, which makes the closing push structure and the opening push structure form an flared structure, making it easier for the isolating moving contact to enter and exit.

[0021] Furthermore, the isolating stationary contact includes a mounting root, on which a mounting hole is provided. The isolating stationary contact is circumferentially mounted on the transmission shaft through the mounting hole to prevent rotation.

[0022] Beneficial effects: By installing the isolating stationary contact on the transmission shaft to prevent rotation, the isolating stationary contact can directly transmit force to the transmission shaft, making force transmission more reliable.

[0023] The circuit breaker cabinet of this invention adopts the following technical solution:

[0024] The circuit breaker cabinet includes a gas box containing a linkage switch. The linkage switch includes an arc-extinguishing chamber and a three-position switch. The moving contact rod of the arc-extinguishing chamber's moving contact is equipped with a drive shaft, and the rotation of the drive shaft drives the arc-extinguishing chamber's moving contact to open and close. The isolating stationary contact of the three-position switch is electrically connected to the arc-extinguishing chamber's moving contact via a flexible connection. The isolating stationary contact is also connected to the drive shaft. The isolating moving contact of the three-position switch is used to link the operating mechanism. The grounding stationary contact of the three-position switch is located on the movement path of the isolating moving contact. The head has a closing push structure and a opening push structure configured opposite each other along its movement path. When the isolating moving contact moves in the isolating closing direction, it pushes the closing push structure and drives the isolating stationary contact to move forward. The isolating stationary contact drives the transmission shaft to rotate, thereby pulling the arc-extinguishing chamber moving contact to the closing position. When the isolating moving contact moves in the isolating opening direction, it pushes the opening push structure and drives the isolating stationary contact to move in the reverse direction. The isolating stationary contact drives the transmission shaft to rotate, and after pulling the arc-extinguishing chamber to complete the opening, the isolating moving contact separates from the isolating stationary contact and moves towards the isolation position.

[0025] Beneficial Effects: This invention proposes an improved circuit breaker cabinet. Based on the transmission connection between the moving contact of the arc-extinguishing chamber and the transmission shaft, the isolating stationary contact of the three-position switch is also transmission-connected to the transmission shaft. A closing push structure and a opening push structure are configured opposite each other on the moving contact of the isolating stationary contact along the movement path of the isolating moving contact. When the isolating moving contact moves towards the closing direction, it pushes the closing push structure and causes the isolating stationary contact to move forward. The isolating stationary contact drives the transmission shaft to rotate, thereby pulling the arc-extinguishing chamber moving contact to the closed position. When the isolating moving contact moves towards the opening direction, it pushes the opening push structure and causes the isolating stationary contact to move in the opposite direction. The isolating stationary contact drives the transmission shaft to rotate, and after pulling the arc-extinguishing chamber to complete the opening, the isolating moving contact separates from the isolating stationary contact and moves towards the isolation position. The interlocking switch requires only one operating mechanism, linking the isolating moving contact of the three-position switch with the operating mechanism. Controlling this single mechanism ensures that during closing, the three-position switch is first driven to close, followed by the arc-extinguishing chamber; during opening, the arc-extinguishing chamber is first driven to open, followed by the three-position switch. During grounding, the arc-extinguishing chamber remains in the open position, while the three-position switch is grounded, ensuring that both load current and short-circuit current are interrupted by the arc-extinguishing chamber. The interlocking switch operates in accordance with the traditional three-position SF6 switch, simplifying control and avoiding the risk of misoperation. Furthermore, requiring only one operating mechanism, and with a simple and reliable interlocking structure between the arc-extinguishing chamber and the three-position switch, the cost of the circuit breaker cabinet is significantly reduced.

[0026] Furthermore, the isolating stationary contact is fixed relative to the transmission shaft and rotates with the transmission shaft, while the isolating moving contact is rotated.

[0027] Beneficial effects: By fixing the isolating stationary contact relative to the transmission shaft, the isolating stationary contact can rotate with the transmission shaft, while the isolating moving contact is rotated. This makes the transmission structure relatively simple and the transmission reliable.

[0028] Furthermore, the transmission shaft is equipped with a push-pull cam, which is connected to the moving contact rod through a mating groove and drives the opening and closing action of the brake.

[0029] Beneficial effects: By connecting the moving contact rod to the transmission shaft via a push-pull cam, only the contour line of the mating groove on the push-pull cam needs to be designed to accurately control the opening and closing action of the moving contact rod. The transmission structure is simple and the transmission is reliable.

[0030] Furthermore, the isolating stationary contact is a plate structure, including a main plate body that is parallel to or coincides with the rotation plane of the isolating moving contact. The main plate body has a contact plate surface that makes conductive contact with the isolating moving contact. On the contact plate surface, on opposite sides in the rotation direction of the isolating moving contact, there are protruding structures that protrude from the main plate body surface. The two protruding structures respectively constitute the closing push structure and the opening push structure.

[0031] Beneficial effects: The isolating stationary contact has a plate structure. On the main body of the isolating stationary contact, protruding structures are set on opposite sides of the isolating moving contact in the direction of rotation to cooperate with the isolating moving contact during opening and closing. The overall structure of the isolating stationary contact is simple, and the two protruding structures are convenient and reliable to cooperate with the isolating moving contact during opening and closing.

[0032] Furthermore, the protruding structure is an integral part of the main board body and is located at both ends of the main board body. One end of the flexible connection is connected to the side of the isolation stationary contact of the protruding structure at one end of the main board body in the direction of rotation.

[0033] Beneficial effects: The protruding structure is integrated with the main board, which gives the protruding structure and the main board a high connection strength, preventing the protruding structure from loosening or deforming. This further ensures that the protruding structure and the isolating moving contact form a reliable push-fit. The integrated design of the protruding structure and the main board also makes the lateral area of ​​the isolating stationary contact in the direction of rotation larger, making the connection between the soft connection and the isolating stationary contact more convenient and reliable.

[0034] Furthermore, one end of the flexible connection is connected to the side of the protruding structure that constitutes the tripping push structure.

[0035] Beneficial effects: In this way, during the opening and closing action of the isolating stationary contact as it swings with the isolating moving contact, the flexible connection is always positioned above and to the side of the isolating stationary contact. The end of the flexible connection connected to the isolating stationary contact does not need to wrap around the isolating stationary contact, thus avoiding interference between components and preventing damage to the flexible connection, thereby improving the reliability and service life of the switchgear.

[0036] Furthermore, at least one of the closing push structure and the opening push structure has a sloped or curved side facing the other, forming a flared structure.

[0037] Beneficial effects: During the rotation of the isolating moving contact, it makes conductive contact with the main board of the isolating stationary contact to achieve closing. The main board is located between the closing push structure and the opening push structure, which makes the closing push structure and the opening push structure form an flared structure, making it easier for the isolating moving contact to enter and exit.

[0038] Furthermore, the isolating stationary contact includes a mounting root, on which a mounting hole is provided. The isolating stationary contact is circumferentially mounted on the transmission shaft through the mounting hole to prevent rotation.

[0039] Beneficial effects: By installing the isolating stationary contact on the transmission shaft to prevent rotation, the isolating stationary contact can directly transmit force to the transmission shaft, making force transmission more reliable. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the circuit breaker cabinet of the present invention;

[0041] Figure 2 This is a schematic diagram of the three-position switch and arc-extinguishing chamber in the closed state in Embodiment 1 of the circuit breaker cabinet of the present invention;

[0042] Figure 3 This is a schematic diagram of the three-position switch in the open state in Embodiment 1 of the circuit breaker cabinet of the present invention;

[0043] Figure 4 This is a schematic diagram of the three-position switch open state in Embodiment 1 of the circuit breaker cabinet of the present invention;

[0044] Figure 5 This is a schematic diagram of the grounding state of the three-position switch in Embodiment 1 of the circuit breaker cabinet of the present invention;

[0045] Figure 6 This is a schematic diagram of the three-position switch in the just-closed state in Embodiment 1 of the circuit breaker cabinet of the present invention;

[0046] Figure 7 This is a schematic diagram of the isolation stationary contact of the three-position switch in Embodiment 1 of the circuit breaker cabinet of the present invention;

[0047] In the diagram: 1. Busbar bushing; 2. Gas box; 3. Connecting bar; 4. Arc-extinguishing chamber; 401. Arc-extinguishing chamber stationary contact; 402. Arc-extinguishing chamber moving contact; 5. Insulating support; 6. Flexible connection; 7. Contact spring; 8. Drive shaft support; 9. Drive shaft; 10. Isolating stationary contact; 101. Mounting hole; 102. Left side protrusion structure; 103. Right side protrusion structure; 104. Main board body; 11. Isolating moving contact; 12. Grounding stationary contact; 13. Intermediate contact seat; 14. Branch bar; 15. Inlet / outlet bushing; 17. Push-pull cam; 18. Insulating shaft; 19. Moving contact pull rod; 20. Roller. Detailed Implementation

[0048] This invention improves upon existing circuit breaker cabinets by connecting the moving contact of the arc-extinguishing chamber to the drive shaft. It further connects the isolating stationary contact of the three-position switch to the drive shaft, and positions a closing push structure and an opening push structure relative to each other on the moving contact's path. When the moving contact moves in the closing or opening direction, it engages with these structures to move the stationary contact, which in turn rotates the drive shaft, thus actuating the arc-extinguishing chamber's moving contact. This allows the interlocking switch to require only one operating mechanism. The interlocking mechanism links the moving contact of the three-position switch to the arc-extinguishing chamber, controlling the arc-extinguishing chamber and the three-position switch to open and close in the required sequence. When the arc-extinguishing chamber is in the open position, the three-position switch is grounded, ensuring that both load current and short-circuit current are interrupted by the arc-extinguishing chamber.

[0049] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0050] Embodiment 1 of the circuit breaker cabinet of the present invention:

[0051] like Figure 1 As shown, the circuit breaker cabinet includes a gas box 2. A busbar bushing 1 is fixed on the top plate of the gas box 2, and an inlet / outlet bushing 15 is fixed on the front plate. A linkage switch is provided inside the gas box 2. The linkage switch includes an arc-extinguishing chamber 4 and a three-position switch. The arc-extinguishing chamber 4 is located above the three-position switch and is fixed on an insulating support 5. The three-position switch is reliably electrically connected to the inlet / outlet bushing 15 through a branch line 14. The stationary end of the arc-extinguishing chamber 4 is reliably electrically connected to the busbar bushing 1 through a connecting line 3.

[0052] The arc-extinguishing chamber 4 includes a housing, inside which are a stationary contact 401 and a moving contact 402. The stationary contact 401 is electrically connected to the bus bushing 1 via a connecting bar 3. The moving contact 402 is connected to a moving contact rod 19. The lower end of the moving contact rod 19 extends downward out of the housing of the arc-extinguishing chamber 4, and a contact spring 7 is fitted on the extended part. The contact spring 7 provides an elastic force to the moving contact 402 towards the stationary contact 401 to ensure that the moving contact 402 and the stationary contact 401 are pressed tightly together when the arc-extinguishing chamber 4 is closed, thus ensuring the reliability of the closing operation. The moving contact rod 19 is equipped with a push-pull cam 17, which is located on the drive shaft support 8. The push-pull cam 17 has a mating groove that cooperates with the roller 20 at the end of the moving contact rod 19. When the push-pull cam 17 rotates, the roller 20 can roll along the contour line of the mating groove, thereby driving the moving contact rod 19 to move up and down, thus driving the moving contact 402 of the arc-extinguishing chamber to open and close. The drive shaft 9 of the push-pull cam 17 is equipped with a tripping energy storage mechanism. The tripping energy storage mechanism can be the tripping energy storage mechanism used in existing circuit breakers. The tripping energy storage mechanism is used to provide a large tripping force when the arc-extinguishing chamber 4 is tripped, so that the arc-extinguishing chamber 4 can be tripped quickly. The end of the mating groove blocks the roller 20 at the end of the moving contact rod 19, so that the arc-extinguishing chamber 4 can always be kept in the open position.

[0053] The three-position switch includes an isolating moving contact 11, an isolating stationary contact 10, and a grounding stationary contact 12. The isolating moving contact 11 is rotatably mounted on an intermediate contact seat 13, which is fixed to an insulating bracket 5. One end of the intermediate contact seat 13 is electrically connected to a branch row 14, and the other end is electrically connected to the isolating moving contact 11. The isolating moving contact 11 is embedded in an insulating rotating shaft 18 and rotates around the axis with the insulating rotating shaft 18. The insulating rotating shaft 18 is linked to an operating mechanism. Driven by the operating mechanism, the insulating rotating shaft 18 drives the isolating moving contact 11 to rotate, thereby achieving electrical connection between the isolating moving contact 11 and the isolating stationary contact 10, electrical connection with the grounding stationary contact 12, and forming an isolation break between the isolating stationary contact 10 and the grounding stationary contact 12. The isolating stationary contact 10 is circumferentially anti-rotating mounted on a drive shaft 9 of a push-pull cam 17. The isolating stationary contact 10 is electrically connected to the arc-extinguishing chamber moving contact 402 through a flexible connection 6. The grounding stationary contact 12 is mounted on the grounding contact base, which is reliably electrically connected to the gas box 2. Both the isolating stationary contact 10 and the grounding stationary contact 12 are located on the rotation path of the isolating moving contact 11.

[0054] The isolating stationary contact 10 has a plate-type structure, such as... Figure 7As shown, it includes a mounting root and a main board body 104. The main board body 104 is parallel to the rotation plane of the isolating moving contact 11. The main board body 104 has a contact plate surface for conductive contact with the isolating moving contact 11. The mounting root is provided with a mounting hole 101. The isolating stationary contact 10 is circumferentially mounted on the transmission shaft 9 through the mounting hole 101 to prevent rotation. The main board 104 has a left protruding structure 102 and a right protruding structure 103 protruding from the surface of the main board 104 at its left and right ends, respectively. When the isolating moving contact 11 rotates in the isolating closing direction, the isolating moving contact 11 pushes the left protruding structure 102 and drives the isolating stationary contact 10 and the push-pull cam 17 to rotate in the forward direction. Then, through the moving contact pull rod 19, it drives the arc-extinguishing chamber moving contact 402 to the closing position. When the isolating moving contact 11 rotates in the isolating opening direction, the isolating moving contact 11 pushes the right protruding structure 103 and drives the isolating stationary contact 10 and the push-pull cam 17 to rotate in the reverse direction, realizing the tripping of the opening energy storage tripping structure. After tripping, the transmission shaft 9 rotates rapidly and drives the arc-extinguishing chamber 4 to complete the opening. Then, the isolating moving contact 11 rotates to the isolation position.

[0055] The two protruding structures are integrated with the main board 104. One end of the flexible connection 6 is connected to the side of the isolating stationary contact 10 of the right protruding structure 103 in the direction of rotation. The side of the left protruding structure 102 facing the right protruding structure 103 is inclined, and the side of the right protruding structure 103 facing the left protruding structure 102 is also inclined, thus forming a flared structure between the left protruding structure 102 and the right protruding structure 103, which makes it easier for the isolating moving contact 11 to enter and exit.

[0056] The arc-extinguishing chamber 4 is placed vertically with its moving end facing down. The intermediate contact 13 is located directly below the arc-extinguishing chamber 4, the isolating stationary contact 10 is located directly above the intermediate contact 13, and the grounding contact is located to the right of the intermediate contact 13. After the linkage switch is closed, the main conductive circuit composed of the bus bushing 1, the arc-extinguishing chamber 4, and the three-position switch is approximately a straight line, which makes the overall structure of the circuit breaker cabinet compact, the main conductive circuit short, the circuit resistance small, and the cost low.

[0057] The different states of the linkage switch are described in detail below with reference to the attached diagram.

[0058] like Figure 2As shown, the three-position switch is in the closed position and the arc-extinguishing chamber 4 is also in the closed position. At this time, the isolating moving contact 11 and the main board body 104 on the isolating stationary contact 10 are in reliable contact. The roller 20 on the moving contact pull rod 19 is on the closed position contour line of the mating groove of the push-pull cam 17, and the contact spring 7 is compressed to the final pressure. During the opening operation, the operating mechanism drives the insulating shaft 18 to rotate clockwise, which in turn drives the isolating moving contact 11 to rotate clockwise. The isolating moving contact 11 pushes against the right protrusion 103 of the isolating stationary contact 10, driving the transmission shaft 9 to rotate counterclockwise. After rotating counterclockwise by a small angle, the transmission shaft 9 achieves energy storage tripping and continues to rotate rapidly. The transmission shaft 9 drives the push-pull cam 17 to rotate counterclockwise, and the roller 20 on the moving contact rod 19 moves rapidly from the closed position to the open position along the contour line of the push-pull cam 17. The moving contact rod 19 drives the arc-extinguishing chamber moving contact 402 to move downward to the open position. At this time, the isolating moving contact 11 slides on the main body 104 of the isolating stationary contact 10 and has not disengaged. Figure 3 As shown; at this time, the current is interrupted by the arc-extinguishing chamber 4, and the arc is extinguished. The insulating shaft 18 drives the isolating moving contact 11 to continue rotating clockwise, and the isolating moving contact 11 disengages from the isolating stationary contact 10. Under the action of the tripping energy storage mechanism, the transmission shaft 9 drives the push-pull cam 17 and the isolating stationary contact 10 to continue rotating counterclockwise. The roller 20 on the moving contact pull rod 19 rolls on the equal arc contour line of the push-pull cam 17, and the arc-extinguishing chamber 4 remains in the open position. The isolating moving contact 11 moves to between the isolating stationary contact 10 and the grounding stationary contact 12, and a reliable isolation break is formed between the isolating moving contact 11 and the isolating stationary contact 10. At this time, the linkage switch completes the tripping process and is in the open position, as shown. Figure 4 As shown.

[0059] Grounding operation: First, confirm that the interlocking switch is in the open position, such as... Figure 4 As shown. The operating mechanism drives the insulating shaft 18 to rotate clockwise, which in turn drives the isolating moving contact 11 to rotate clockwise. The isolating moving contact 11 then contacts and reliably connects to the grounding stationary contact 12. The arc-extinguishing chamber 4 remains in the open position thanks to the tripping energy storage mechanism, at which point the grounding operation is completed, as shown. Figure 5 As shown.

[0060] Grounding tripping operation: First, confirm that the interlocking switch is in the grounding position, such as... Figure 5 As shown. The operating mechanism drives the insulating shaft 18 to rotate counterclockwise, which in turn drives the isolating moving contact 11 to rotate counterclockwise. The isolating moving contact 11 separates from the grounding stationary contact 12, forming a reliable isolation break between the isolating moving contact 11 and the isolating stationary contact 10. The arc-extinguishing chamber 4 remains in the open position thanks to the tripping energy storage mechanism, at which point the grounding tripping operation is completed, as shown. Figure 4 As shown.

[0061] Closing operation: First, confirm that the interlocking switch is in the open position, such as... Figure 4 As shown. The operating mechanism drives the insulating shaft 18 to rotate counterclockwise, and the insulating shaft 18 drives the isolating moving contact 11 to rotate counterclockwise. The isolating moving contact 11 just makes contact with the main board body 104 of the isolating stationary contact 10. At this time, the arc-extinguishing chamber 4 remains in the open position due to the tripping energy storage mechanism. Figure 6 As shown. The insulating shaft 18 drives the isolating moving contact 11 to continue rotating counterclockwise. The isolating moving contact 11 pushes against the left protruding structure 102 of the isolating stationary contact 10, driving the transmission shaft 9 to rotate clockwise. The transmission shaft 9 drives the push-pull cam 17 to rotate clockwise. The roller 20 on the moving contact pull rod 19 moves from open to closed along the contour line of the push-pull cam 17. The moving contact pull rod 19 drives the arc-extinguishing chamber moving contact 402 to move upward to the closed position. At this time, the isolating moving contact 11 slides on the main body 104 of the isolating stationary contact 10 and has not disengaged. At this time, the linkage switch is in the closed position, as shown. Figure 2 As shown.

[0062] This invention's linkage switch requires only one operating mechanism to link the isolating moving contact 11 of the three-position switch with the operating mechanism. Only the action of the isolating moving contact 11 needs to be transmitted; controlling one operating mechanism is sufficient to achieve the following: during closing, the three-position switch is first driven to close, followed by the arc-extinguishing chamber 4; during opening, the arc-extinguishing chamber 4 is first driven to open, followed by the three-position switch. During grounding, the arc-extinguishing chamber 4 remains in the open position, and the three-position switch is grounded, ensuring that both load current and short-circuit current are interrupted by the arc-extinguishing chamber 4. The linkage switch operates in accordance with the traditional three-position SF6 switch, simplifying control and avoiding the risk of misoperation. Furthermore, only one operating mechanism is required, and the linkage structure between the arc-extinguishing chamber 4 and the three-position switch is simple and reliable, significantly reducing the cost of the circuit breaker cabinet.

[0063] In Embodiment 1 above, the isolating moving contact is rotatably mounted on the intermediate contact seat, and the isolating stationary contact is circumferentially anti-rotating mounted on the transmission shaft and can rotate with the transmission shaft. When the isolating moving contact rotates in the isolating closing direction, it can drive the isolating stationary contact to rotate in the forward direction. The isolating stationary contact drives the transmission shaft to rotate, thereby pulling the arc-extinguishing chamber moving contact to the closing position. When the isolating moving contact rotates in the isolating opening direction, it can drive the isolating stationary contact to rotate in the reverse direction. The isolating stationary contact drives the transmission shaft to rotate, and after pulling the arc-extinguishing chamber to complete the opening, the isolating moving contact separates from the isolating stationary contact and moves to the isolation position. In other embodiments, the isolating moving contact can also be movably mounted on the intermediate contact seat, and the movement path of the isolating moving contact is a straight line. The isolating stationary contact is circumferentially anti-rotating mounted on the transmission shaft and can rotate with the transmission shaft. A transmission mechanism that can convert linear motion into rotational motion is provided between the isolating moving contact and the transmission shaft, so that the isolating moving contact drives the isolating stationary contact to rotate through the transmission mechanism. In other embodiments, the isolating moving contact can be movably mounted on the intermediate contact seat, the movement path of the isolating moving contact is a straight line, and the movement path of the isolating stationary contact is also a straight line. A transmission mechanism capable of converting linear motion into rotational motion is provided between the isolating stationary contact and the transmission shaft. The isolating moving contact drives the isolating stationary contact to make linear motion, and the isolating stationary contact drives the transmission shaft to rotate through the transmission mechanism.

[0064] In the above embodiment 1, a push-pull cam is configured on the transmission shaft. The push-pull cam is connected to the moving contact rod through the mating groove on it and drives it to perform opening and closing actions. In other embodiments, a crank arm linkage mechanism or a crank slider transmission mechanism can be set between the transmission shaft and the moving contact rod to drive the moving contact rod to perform opening and closing actions.

[0065] In Embodiment 1 above, the isolating stationary contact is circumferentially anti-rotated and mounted on the transmission shaft; while in other embodiments, the isolating stationary contact can also be fixed on the push-pull cam, and the push-pull cam is circumferentially anti-rotated and mounted on the transmission shaft.

[0066] In the above embodiment 1, protruding structures are provided on opposite sides of the main board of the isolating stationary contact. The two protruding structures respectively constitute a closing push structure and a opening push structure that cooperate with the pushing of the isolating moving contact. In other embodiments, the closing push structure and the opening push structure are respectively stop arms that are independent of the main board and are provided on the side of the main board surface. The stop arms are fixedly connected to the mounting root.

[0067] In the above embodiment 1, the two protruding structures of the isolating stationary contact are integral with the main board body, and one end of the flexible connection is connected to the side of the right protruding structure; while in other embodiments, one end of the flexible connection can also be connected to the side of the left protruding structure, and the two protruding structures can also be fixedly connected to the main board body by bolts.

[0068] In Embodiment 1 above, the two protruding structures of the isolating stationary contact have beveled sides that are close to each other to form a flared structure, facilitating the entry and exit of the isolating moving contact. In other embodiments, the two protruding structures may also have curved sides that are close to each other to form a flared structure. Alternatively, the two protruding structures may form a straight structure with equal distances between each part.

[0069] The present invention also provides an embodiment of a linkage switch, the specific structure of which is the same as the structure of the linkage switch in the above-described embodiments of the circuit breaker cabinet, and will not be described again here.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A linkage switch, comprising an arc-extinguishing chamber (4) and a three-position switch, wherein the moving contact rod (19) of the moving contact (402) of the arc-extinguishing chamber is equipped with a transmission shaft (9), and the rotation of the transmission shaft (9) drives the moving contact (402) of the arc-extinguishing chamber to perform opening and closing actions; the isolating stationary contact (10) of the three-position switch is electrically connected to the moving contact (402) of the arc-extinguishing chamber through a flexible connection (6), characterized in that, The isolating stationary contact (10) is connected to the transmission shaft. The isolating moving contact (11) of the three-position switch is used to link the operating mechanism. The grounding stationary contact (12) of the three-position switch is located on the movement path of the isolating moving contact (11). The isolating stationary contact (10) is equipped with a closing push structure and a opening push structure on the movement path of the isolating moving contact (11). When the isolating moving contact (11) moves in the isolating closing direction, it pushes the closing push structure and drives the isolating stationary contact (10). 10) In the forward movement, the isolating stationary contact (10) drives the transmission shaft (9) to rotate, thereby pulling the arc-extinguishing chamber moving contact (402) to the closed position. When the isolating moving contact (11) moves in the direction of isolating opening, it pushes the opening push structure and drives the isolating stationary contact (10) to move in the reverse direction. The isolating stationary contact (10) drives the transmission shaft (9) to rotate, and after pulling the arc-extinguishing chamber (4) to complete the opening, the isolating moving contact (11) separates from the isolating stationary contact (10) and moves towards the isolation position.

2. The linkage switch according to claim 1, characterized in that, The isolating stationary contact (10) is fixed relative to the transmission shaft (9) and rotates with the transmission shaft (9), while the isolating moving contact (11) is rotated.

3. The linkage switch according to claim 2, characterized in that, The transmission shaft (9) is equipped with a push-pull cam (17), which is connected to the moving contact rod (19) through a mating groove and drives its opening and closing action.

4. The linkage switch according to claim 2 or 3, characterized in that, The isolating stationary contact (10) is a plate structure, including a main plate body (104) that is parallel to or coincides with the rotation plane of the isolating moving contact (11). The main plate body (104) has a contact plate surface that makes conductive contact with the isolating moving contact (11). On the contact plate surface, on opposite sides in the rotation direction of the isolating moving contact (11), there are protrusions protruding from the plate surface of the main plate body (104). The two protrusions constitute the closing push structure and the opening push structure, respectively.

5. The linkage switch according to claim 4, characterized in that, The protruding structure is an integral part of the main board body (104) and is located at both ends of the main board body (104). One end of the soft connection (6) is connected to the side of the isolation stationary contact of the protruding structure at one end of the main board body (104) in the direction of rotation.

6. The linkage switch according to claim 5, characterized in that, One end of the flexible connection (6) is connected to the side of the protruding structure that constitutes the tripping push structure.

7. The linkage switch according to claim 4, characterized in that, At least one of the closing push structure and the opening push structure has a sloped or curved side facing the other, forming a flared structure.

8. The linkage switch according to claim 4, characterized in that, The isolating stationary contact (10) includes a mounting root, on which a mounting hole (101) is provided. The isolating stationary contact (10) is circumferentially mounted on the transmission shaft (9) through the mounting hole (101) to prevent rotation.

9. A circuit breaker cabinet, including a gas box (2), wherein the gas box (2) is equipped with a linkage switch, characterized in that, The linkage switch is the linkage switch described in any one of claims 1-8.

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