Combined circuit breaker with interlock

Abstract

This invention discloses a combined circuit breaker with an interlocking device, comprising a switch frame. A circuit breaker main shaft, an isolating operating shaft, and a grounding operating shaft are rotatably mounted on the switch frame. The switch frame has an isolating operating hole. A support frame is mounted on the switch frame corresponding to the grounding operating shaft position. The switch frame also has a cabinet door with a grounding operating hole. A baffle plate is slidably mounted on the support frame along its height direction. The upper end of the baffle plate is located near the edge of the support frame, and the lower end has a force-bearing plate. A push block is mounted on the cabinet door. A retaining ring is circumferentially mounted on the grounding operating shaft corresponding to the grounding operating hole position to restrict the sliding of the baffle plate after grounding tripping. The retaining ring has a slot for inserting part of the baffle plate into the grounding operating hole after grounding tripping. Its structure is simple, the interlocking structure is stable and reliable, operation is convenient, and it has good performance.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and in particular to a combined circuit breaker with an interlocking device. Background Technology

[0002] A circuit breaker is a common type of electrical switching device. When energizing, the cabinet door must be closed first, the grounding switch opened, the isolating switch closed, and finally the circuit breaker closed. During power outage maintenance, the circuit breaker must be opened, the isolating switch opened, and the grounding switch closed before opening the cabinet door for maintenance. Only by following these procedures can the entire circuit breaker be used safely. To ensure the overall safety of the circuit breaker, interlocking mechanisms are usually installed to guarantee its safe operation and prevent accidental operation that could lead to danger. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a combined circuit breaker with an interlocking device, which has a simple structure, a stable and reliable interlocking structure, convenient operation, and good performance.

[0004] To achieve the above objectives, the present invention provides a combined circuit breaker with an interlocking device, comprising a switch frame, on which a circuit breaker main shaft, an isolating operating shaft, and a grounding operating shaft are rotatably mounted. The switch frame has an isolating operating hole for operating the isolating operating shaft. A support frame is provided on the switch frame corresponding to the position of the grounding operating shaft. The switch frame also has a cabinet door that covers the corresponding position of the support frame. The cabinet door has a grounding operating hole for operating the grounding operating shaft. A baffle plate is slidably installed on the support frame along the height direction of the switch frame. The upper end of the baffle plate is located near the edge of the support frame, and the lower end is provided with a force plate. The cabinet door is provided with a push block for pushing the force plate as the cabinet door is opened, so that the upper end of the baffle plate is exposed outside the support frame and covers the grounding operation hole. The grounding operation shaft is provided with a retaining ring along the circumferential direction at the position of the grounding operation hole to limit the sliding of the baffle plate after the grounding is tripped. The retaining ring is provided with an insertion port for the baffle plate to be partially inserted into the grounding operation hole after the grounding is closed.

[0005] The beneficial effects of this configuration are as follows: After the grounding operation trips, the rotation of the grounding operation shaft causes the retaining ring to rotate as well. The socket on the retaining ring is no longer aligned with the shielding plate, causing the peripheral wall of the retaining ring to face the shielding plate. This ensures that when the cabinet door is opened, the push block on the door abuts against the force plate and cannot push the shielding plate, thus limiting the upward movement of the cabinet door and restricting its opening. After the grounding operation is closed, the socket of the retaining ring aligns with the shielding plate, allowing the shielding plate to be pushed open. The block slides down, causing part of the shield to be inserted into the socket, thus restricting the grounding tripping operation by inserting the operating handle. As the cabinet door moves upward, the upper end of the shield is exposed outside the support frame. When the cabinet door is closed, the door abuts against the upper end of the shield. As the door closes, the shield moves downward and contacts the grounding operation hole, thus forming an interlock between grounding and cabinet door opening and closing. This structure is simple, the overall layout is more reasonable, and it has good performance.

[0006] As a further feature of the present invention, the retaining ring is also provided with a locking port, and a locking rod is slidably provided on the support frame. One end of the locking rod is provided corresponding to the position of the locking port, and the other end is provided close to the isolation operating shaft. The isolation operating shaft is provided with a first abutting flange for resisting the locking rod and preventing the locking rod from disengaging from the locking port when the isolation operating shaft is closed.

[0007] The beneficial effects of this design are as follows: By setting a locking rod, after the isolation is closed, the first abutting flange on the isolation operating shaft abuts against the locking rod, causing the locking rod to insert into the locking port, thereby restricting the rotation of the grounding operating shaft and blocking the path of the operating handle insertion, thus restricting the closing operation. After the isolation is opened, the first abutting flange no longer abuts against the locking rod, so the locking rod can be operated to disengage from the locking port. This disengagement can be achieved through a spring reset structure or manual disengagement. After the grounding is closed, the rotation of the grounding operating shaft causes the locking port to be misaligned from the insertion position of the locking rod, preventing the locking rod from moving down and inserting. This restricts the position of the locking rod and also restricts the rotation of the isolation operating shaft, thereby restricting the closing action of the isolation operating shaft, making it safer and more reliable. This structure is simple, has good performance, and achieves interlocking between grounding and isolation.

[0008] As a further feature of the present invention, the locking rod includes an abutting part, a limiting part, and a connecting part. The abutting part is located at a position corresponding to the isolation operating shaft, and the limiting part is located at a position corresponding to the locking opening. The limiting part and the abutting part are connected by a connecting part. The connecting part extends outward from the cabinet door to form a push rod. A push groove is provided on the cabinet door along the height direction of the switch frame at a position corresponding to the push rod. The push rod slides in cooperation with the push groove.

[0009] The advantages of this design are: by setting the locking rod in this way, it is easier to operate. After the isolation operating shaft is tripped, the limit part can be manually pushed away from the locking port by the push rod, so that the grounding operating shaft can rotate without obstructing the operating shaft from being inserted into the grounding operating hole for grounding operation. This structure is simple, easier to operate, and has good performance.

[0010] As a further feature of the present invention, a second abutting flange is provided on the main shaft of the circuit breaker, and an interlocking plate is slidably arranged on the switch frame between the main shaft of the circuit breaker and the isolating operating shaft. One end of the interlocking plate is provided with an abutting protrusion for blocking the isolating operating hole when the main shaft of the circuit breaker is closed, and the other end is located close to the isolating operating hole. A reset spring is also connected to the interlocking plate for resetting the interlocking plate to expose the isolating operating hole after the main shaft of the circuit breaker is opened.

[0011] The beneficial effects of this design are as follows: This design further achieves the locking between the circuit breaker and the disconnector structure. When the circuit breaker is closed, the second abutting flange on the circuit breaker main shaft abuts against the interlocking plate, preventing the interlocking plate from sliding and thus blocking the disconnector operating hole. This prevents the disconnector operating shaft from being operated, ensuring safe operation. After the circuit breaker is opened, the second abutting flange disengages from the interlocking plate, and the interlocking plate resets under the action of the reset spring, no longer blocking the disconnector operating hole. This allows the disconnector operating shaft to be opened and closed.

[0012] As a further feature of the present invention, a guide block is provided on the switch frame, and a guide groove is provided on the interlocking plate at the position corresponding to the guide block. The guide groove slides and the guide block. One end of the reset spring is connected to the guide block, and the other end is connected to the interlocking plate.

[0013] The beneficial effects of this design are that it makes the overall structure operate more stably, and the structural layout is reasonable and compact, thereby improving the overall stability of the structure.

[0014] As a further feature of the present invention, a locking plate is slidably provided on the switch frame along the height direction of the switch frame. The locking plate is provided with a limiting protrusion for restricting the closing of the circuit breaker and an abutting protrusion for moving the limiting protrusion to the limiting position when an operating handle is inserted into the isolation operating hole. The abutting protrusion is provided near the edge of the isolation operating hole.

[0015] The beneficial effects of this design are as follows: After operating the isolating operating shaft, the operating handle may remain inserted in the isolating operating hole and forgotten to be removed. During circuit breaker closing operations, this could cause the interlocking plate to be squeezed and deformed, affecting the stability of the overall structure. With this design, when the handle is inserted, the locking plate cannot slide down, ensuring that the limit protrusion on the locking plate is in the position to lock the circuit breaker closing. The locking method involves contacting the circuit breaker's closing plate, allowing the closing plate to rotate. This closing plate is a common structure in circuit breakers and is existing technology, so it will not be elaborated upon here. After the handle is pulled out of the isolating operating hole, the locking plate falls under gravity, causing the limit protrusion to disengage from the locked position, allowing the circuit breaker to be closed. This structure is simple, reliable, and has good performance.

[0016] As a further feature of the present invention, the locking plate is provided with an operating protrusion, the operating protrusion is exposed outside the switch frame, and the switch frame is provided with an operating groove corresponding to the position of the operating protrusion, the operating protrusion and the operating groove slidingly engaging.

[0017] The advantages of this configuration are: it facilitates manual operation when locking the board, improves the overall reliability of the structure, and has a good performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the interlocking component structure according to an embodiment of the present invention;

[0021] Figure 4 This is a structural schematic diagram of the interlocking plate position in an embodiment of the present invention. Detailed Implementation

[0022] Examples of embodiments of the combined circuit breaker with interlocking device of the present invention Figures 1 to 4As shown: The device includes a switchgear frame 1, on which a circuit breaker main shaft 3, an isolating operating shaft 4, and a grounding operating shaft 5 are rotatably mounted. The switchgear frame 1 has an isolating operating hole 11 for operating the isolating operating shaft 4. A support frame is provided on the switchgear frame 1 corresponding to the position of the grounding operating shaft 5. The switchgear frame 1 also has a cabinet door 2, which covers the corresponding position of the support frame. The cabinet door 2 has a grounding operating hole 21 for operating the grounding operating shaft 5. A cover is slidably mounted on the support frame along the height direction of the switchgear frame 1. The upper end of the shielding plate 23 is located near the edge of the support frame, and the lower end is provided with a force-bearing plate 24. The cabinet door 2 is provided with a pusher block 22 for pushing the force-bearing plate 24 as the cabinet door 2 opens, so that the upper end of the shielding plate 23 is exposed outside the support frame and the grounding operation hole 21 is blocked. The grounding operation shaft 5 is provided with a retaining ring 51 along the circumferential direction at the position of the grounding operation hole 21 to limit the sliding of the shielding plate 23 after the grounding is tripped. The retaining ring 51 is provided with an insertion port 52 for the shielding plate 23 to be partially inserted into the grounding operation hole 21 after the grounding is closed. The beneficial effect of this configuration is that, after the grounding operation is tripped, the rotation of the grounding operation shaft 5 causes the retaining ring 51 to rotate accordingly. The socket 52 on the retaining ring 51 is no longer aligned with the shielding plate 23, causing the peripheral wall of the retaining ring 51 to face the shielding plate 23. This means that when the cabinet door 2 is opened, the push block 22 on the cabinet door 2 abuts against the force plate 24 and cannot push the shielding plate 23, thus limiting the upward movement of the cabinet door 2 and restricting its opening. After the grounding operation is closed, the socket 52 of the retaining ring 51 aligns with the shielding plate 23, causing the shielding plate 23 to... 3 can slide under the action of the push block 22, and make part of the structure of the shield 23 insert into the socket 52, thereby restricting the grounding trip operation of the operating handle. As the cabinet door 2 moves upward, the upper end of the shield 23 is exposed outside the support frame. When the cabinet door 2 is closed, the cabinet door 2 abuts against the upper end of the shield 23. As the door closes, the shield 23 moves downward and contacts the grounding operation hole 21, thus forming an interlock between grounding and the opening and closing of the cabinet door 2. This structure is simple, the overall layout is more reasonable, and it has a good performance.

[0023] As a further feature of this embodiment, the retaining ring 51 is also provided with a locking port, and a locking rod is slidably provided on the support frame. One end of the locking rod is provided corresponding to the locking port position, and the other end is provided close to the isolation operating shaft 4. The isolation operating shaft 4 is provided with a first abutting flange 41 for resisting the locking rod and preventing the locking rod from disengaging from the locking port when the isolation operating shaft 4 is closed. The beneficial effects of this design are as follows: By setting a locking rod, after the isolation operation shaft 4 is closed, the first abutting flange 41 on the isolation operation shaft 4 abuts against the locking rod, causing the locking rod to insert into the locking port, thereby restricting the rotation of the grounding operation shaft 5 and blocking the path of the operating handle insertion, thus restricting the closing operation. After the isolation operation is opened, the first abutting flange 41 no longer abuts against the locking rod, so the locking rod can be operated to disengage from the locking port. The disengagement method can be through a spring reset structure or manual disengagement. After the grounding operation shaft 5 is closed, the rotation of the grounding operation shaft 5 causes the locking port to be misaligned from the insertion position of the locking rod, preventing the locking rod from moving down and inserting, thus restricting the position of the locking rod and also restricting the rotation of the isolation operation shaft 4, thereby restricting the closing action of the isolation operation shaft 4, making it safer and more reliable. This structure is simple, has good performance, and achieves interlocking between grounding and isolation.

[0024] As a further feature of this embodiment, the locking rod includes an abutment part 42, a limiting part 43, and a connecting part 44. The abutment part 42 is located at a position corresponding to the isolating operating shaft 4, and the limiting part 43 is located at a position corresponding to the locking port. The limiting part 43 and the abutment part 42 are connected by the connecting part 44. The connecting part 44 extends outward from the cabinet door 2 to form a push rod 45. A push groove is provided on the cabinet door 2 along the height direction of the switch frame 1 at the position corresponding to the push rod 45. The push rod 45 slides in conjunction with the push groove. The beneficial effect of this configuration is that the locking rod is more convenient to operate. After the isolating operating shaft 4 is opened, the limiting part 43 can be manually pushed away from the locking port by the push rod 45, so that the grounding operating shaft 5 can rotate without obstructing the insertion of the operating shaft into the grounding operating hole 21 for grounding operation. This structure is simple, easier to operate, and has good performance.

[0025] As a further feature of this embodiment, a second abutting flange 31 is provided on the circuit breaker main shaft 3, and an interlocking plate 6 is slidably arranged on the switch frame 1 between the circuit breaker main shaft 3 and the isolating operating shaft 4. One end of the interlocking plate 6 is provided with an abutting protrusion 63 for blocking the isolating operating hole 11 when the circuit breaker main shaft 3 is closed, and the other end is located close to the isolating operating hole 11. A reset tension spring 61 is also connected to the interlocking plate 6 for resetting the interlocking plate 6 to expose the isolating operating hole 11 after the circuit breaker main shaft 3 is opened. The beneficial effects of this configuration are as follows: By setting it up in this way, the locking between the circuit breaker and the disconnector structure is further realized. When the circuit breaker is closed, the second abutting flange 31 on the main shaft 3 of the circuit breaker abuts against the interlocking plate 6, making the interlocking plate 6 unable to slide. This causes the interlocking plate 6 to block the disconnection operation hole 11, thereby preventing the disconnection operation shaft 4 from being operated and ensuring safe use. After the circuit breaker is opened, the second abutting flange 31 disengages from the interlocking plate 6, and the interlocking plate 6 is reset under the action of the reset spring 61 and no longer blocks the disconnection operation hole 11, so that the disconnection operation shaft 4 can be opened and closed.

[0026] As a further feature of this embodiment, a guide block 12 is provided on the switch frame 1, and a guide groove 62 is provided on the interlocking plate 6 corresponding to the guide block 12. The guide groove 62 slides and engages with the guide block 12. One end of the reset spring 61 is connected to the guide block 12, and the other end is connected to the interlocking plate 6. The beneficial effect of this arrangement is that it makes the overall structure operate more stably, and the structural layout is reasonable and compact, thereby improving the overall structural stability.

[0027] As a further feature of this embodiment, a locking plate 7 is slidably provided on the switch frame 1 along the height direction of the switch frame 1. The locking plate 7 is provided with a limiting protrusion 72 for limiting the closing of the circuit breaker and an abutting protrusion 71 for moving the limiting protrusion 72 to the limiting position when the operating handle is inserted into the isolation operating hole 11. The abutting protrusion 71 is provided near the edge of the isolation operating hole 11. The beneficial effects of this design are as follows: After operating the isolating operating shaft 4, the operating handle may be left inserted in the isolating operating hole 11 and forgotten to be removed. During the circuit breaker closing operation, this could cause the interlocking plate 6 to be squeezed and deformed, affecting the stability of the overall structure. With this design, when the handle is inserted, the locking plate 7 cannot slide down, and the limiting protrusion 72 on the locking plate 7 is in the position of locking the circuit breaker closing. The locking method here is to abut against the closing plate of the circuit breaker, allowing the closing plate to rotate. This closing plate is a common structure in circuit breaker structures and is existing technology, so it will not be elaborated on here. After the handle is pulled out of the isolating operating hole 11, the locking plate 7 falls under the action of gravity, thereby causing the limiting protrusion 72 to disengage from the locking position, allowing the circuit breaker to be operated and closed. This structure is simple, reliable, and has good performance.

[0028] As a further feature of this embodiment, the locking plate 7 is provided with an operating protrusion 73, which is exposed outside the switch frame 1. The switch frame 1 is provided with an operating groove corresponding to the position of the operating protrusion 73, and the operating protrusion 73 slides and engages with the operating groove. The beneficial effect of this design is that it facilitates manual operation when the locking plate 7 is locked, improves the reliability of the overall structure, and has a good performance.

[0029] The above examples are merely one preferred embodiment of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included within the protection scope of the present invention.

Claims

1. A combined circuit breaker with an interlocking device, comprising a switch frame, wherein a circuit breaker main shaft, an isolating operating shaft, and a grounding operating shaft are rotatably mounted on the switch frame, and the switch frame is provided with an isolating operating hole for operating the isolating operating shaft, characterized in that: A support frame is provided on the switch frame corresponding to the grounding operation shaft position. A cabinet door is also provided on the switch frame, which covers the corresponding position of the support frame. The cabinet door is provided with a grounding operation hole for operating the grounding operation shaft. A baffle plate is slidably provided on the support frame along the height direction of the switch frame. The upper end of the baffle plate is located near the edge of the support frame, and the lower end is provided with a force plate. A push block is provided on the cabinet door for pushing the force plate as the cabinet door is opened, so that the upper end of the baffle plate is exposed outside the support frame and covers the grounding operation hole. A retaining ring is provided circumferentially on the grounding operation shaft corresponding to the grounding operation hole position to limit the sliding of the baffle plate after grounding is tripped. The retaining ring has an insertion port for the baffle plate to be partially inserted into the grounding operation hole after grounding is closed.

2. The combined circuit breaker with interlocking device according to claim 1, characterized in that: The retaining ring is also provided with a locking port, and a locking rod is slidably provided on the support frame. One end of the locking rod is provided corresponding to the position of the locking port, and the other end is provided close to the isolation operating shaft. The isolation operating shaft is provided with a first abutting flange for resisting the locking rod and preventing the locking rod from disengaging from the locking port when the isolation operating shaft is closed.

3. The combined circuit breaker with interlocking device according to claim 2, characterized in that: The locking rod includes an abutting part, a limiting part, and a connecting part. The abutting part is located at the position corresponding to the isolation operating shaft, and the limiting part is located at the position corresponding to the locking port. The limiting part and the abutting part are connected by a connecting part. The connecting part extends outward from the cabinet door to form a push rod. A push groove is provided on the cabinet door along the height direction of the switch frame at the position corresponding to the push rod. The push rod and the push groove slide and cooperate with each other.

4. The combined circuit breaker with interlocking device according to claim 1, 2, or 3, characterized in that: The circuit breaker main shaft is provided with a second abutting flange. An interlocking plate is slidably arranged on the switch frame between the circuit breaker main shaft and the isolating operating shaft. One end of the interlocking plate is provided with an abutting protrusion for blocking the isolating operating hole when the circuit breaker main shaft is closed. The other end is located near the isolating operating hole. A reset spring is also connected to the interlocking plate for resetting the interlocking plate to expose the isolating operating hole after the circuit breaker main shaft is opened.

5. The combined circuit breaker with interlocking device according to claim 4, characterized in that: The switch frame is provided with a guide block, and the interlocking plate is provided with a guide groove corresponding to the position of the guide block. The guide groove slides and the guide block. One end of the reset spring is connected to the guide block, and the other end is connected to the interlocking plate.

6. The combined circuit breaker with interlocking device according to claim 4, characterized in that: A locking plate is slidably provided on the switch frame along the height direction of the switch frame. The locking plate is provided with a limit protrusion for limiting the closing of the circuit breaker and an abutment protrusion for moving the limit protrusion to the limit position when the operating handle is inserted into the isolation operating hole. The abutment protrusion is provided near the edge of the isolation operating hole.

7. The combined circuit breaker with interlocking device according to claim 6, characterized in that: The locking plate is provided with an operating protrusion, which is exposed outside the switch frame. The switch frame is provided with an operating groove corresponding to the position of the operating protrusion, and the operating protrusion slides and engages with the operating groove.

Images