Interlocking mechanism and switch cabinet

Abstract

The utility model belongs to the technical field of electrical interlocking control, and discloses an interlocking mechanism and a switch cabinet. The interlocking mechanism is used for realizing interlocking of the isolation grounding switch and the circuit breaker. Specifically, the interlocking mechanism comprises a movable plate and an interlocking plate, the movable plate is connected with an operating valve of the isolation grounding switch, and the movable plate has a first state for opening the operating valve and a second state for closing the operating valve; the interlocking plate is arranged in the circuit breaker and is in transmission connection with the movable plate; when the circuit breaker is switched on, a crank arm of the circuit breaker abuts against the interlocking plate, so that the interlocking plate limits the movable plate to be switched from the second state to the first state. And when the movable plate is switched from the second state to the first state, the movable plate drives the interlocking plate, so that the interlocking plate limits closing of the circuit breaker. According to the utility model, the interlocking function of the circuit breaker and the isolation grounding switch can be realized, the interlocking mechanism is relatively simple, the influence on the structure change of the circuit breaker and the isolation grounding switch is small, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical interlocking control technology, and in particular to an interlocking mechanism and switch cabinet. Background Technology

[0002] According to the "five-prevention" interlocking requirements for switchgear in the power industry, the operation of circuit breakers and isolating grounding switches must meet the following requirements: 1. When the isolating grounding switch is in operation, the circuit breaker is not allowed to be closed, so as to avoid the circuit breaker closing when the isolating grounding switch is in the isolation or grounding state, which would lead to an accident in the switchgear; 2. When the circuit breaker is closed, three-position operation is prohibited, and the isolating grounding switch is not allowed to be operated.

[0003] Currently, the interlocking structures for circuit breakers and isolating grounding switches are quite complex, and changes to the structure of circuit breakers and isolating grounding switches have a significant impact, resulting in increased costs. Utility Model Content

[0004] The purpose of this utility model is to provide an interlocking mechanism and switch cabinet for realizing the interlocking function of circuit breaker and isolating grounding switch. At the same time, the interlocking mechanism is relatively simple, has little impact on the structural changes of circuit breaker and isolating grounding switch, and reduces costs.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Interlocking mechanisms, used to isolate grounding switches and circuit breakers, include:

[0007] A movable plate is connected to the operating valve of the isolating grounding switch, and the movable plate has a first state of opening the operating valve and a second state of closing the operating valve;

[0008] An interlocking plate is disposed inside the circuit breaker, and the interlocking plate is throttle-connected to the movable plate;

[0009] When the circuit breaker is closed, the crank arm of the circuit breaker abuts against the interlocking plate, so that the interlocking plate restricts the movable plate from switching from the second state to the first state; when the movable plate switches from the second state to the first state, the movable plate drives the interlocking plate, so that the interlocking plate restricts the circuit breaker from closing.

[0010] As an optional interlocking mechanism, the interlocking mechanism also includes a micro switch disposed on the isolating grounding switch. When the movable plate switches from the second state to the first state, the movable plate can trigger the micro switch, and the micro switch is signal-connected to the relay protection device.

[0011] As an alternative interlocking mechanism, when the movable plate triggers the micro switch, the relay protection device can block the closing signal of the circuit breaker.

[0012] As an alternative to the interlocking mechanism, the interlocking mechanism further includes a linkage component, which is flexible, with one end connected to the movable plate and the other end connected to the interlocking plate.

[0013] As an alternative to the interlocking mechanism, the interlocking mechanism further includes a limiting member disposed on the circuit breaker, and the linkage member passes through the limiting member.

[0014] As an optional interlocking mechanism, the movable plate is connected to the operating end of the operating valve. When the movable plate is switched to the first state, the movable plate drives the operating end to open the handle insertion hole of the isolating grounding switch; when the movable plate is switched to the second state, the movable plate drives the operating end to close the handle insertion hole.

[0015] As an alternative to the interlocking mechanism, the movable plate is provided with a guide groove, and the isolating grounding switch is provided with a guide member, which slides in the guide groove.

[0016] The switchgear includes an isolating grounding switch, a circuit breaker, and the interlocking mechanism described in any of the above schemes.

[0017] As an optional solution for the switch cabinet, the crank arm is provided with a limiting boss that can abut against the interlocking plate.

[0018] As an alternative to the switchgear, the circuit breaker includes an operating mechanism for closing the circuit breaker. The operating mechanism includes a bend plate, and an interlocking plate abuts against the bend plate to restrict the movement of the operating mechanism.

[0019] Beneficial effects:

[0020] In the first aspect of this utility model, when the circuit breaker is closed, the interlocking mechanism utilizes the crank arm, a moving component of the circuit breaker's closing mechanism, to abut against the interlocking plate, thereby preventing the interlocking plate from moving. This further restricts the movable plate and prevents it from being linked to open the operating valve. Therefore, the operating valve remains closed when the circuit breaker is closed, thus preventing operators from accidentally inserting the operating handle into the insertion hole and ensuring operational safety. Furthermore, when it is necessary to operate the isolating grounding switch, the operator first operates the movable plate to switch it to the open first state. At this time, the movable plate drives the interlocking plate to move, causing the interlocking plate to abut against the curved plate of the operating mechanism, thereby preventing the circuit breaker from closing. Through this interlocking mechanism, on the one hand, the interlocking operation of the isolating grounding switch and the circuit breaker can be realized, thus ensuring the safety of the operator; on the other hand, the interlocking function of the isolating grounding switch and the circuit breaker can be achieved using only the movable plate and the interlocking plate, requiring fewer parts, having minimal impact on changes to the overall structure of the isolating grounding switch and the circuit breaker, and resulting in low cost.

[0021] In the second aspect of this embodiment, the switch cabinet equipped with this interlocking mechanism can realize the interlocking function and ensure the safety of operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first internal structure of the isolating grounding switch, circuit breaker, and interlocking mechanism provided in this embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the second internal structure of the isolating grounding switch, circuit breaker, and interlocking mechanism provided in this embodiment of the utility model;

[0024] Figure 3 This is a partial schematic diagram of the interior of the circuit breaker provided in this embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the isolating grounding switch provided in an embodiment of this utility model.

[0026] In the picture:

[0027] 100. Isolating grounding switch; 110. Operating valve; 120. Insertion hole; 130. Guide component; 200. Circuit breaker; 210. Crank arm; 211. Limiting boss; 220. Bend plate; 230. Closing half shaft;

[0028] 1. Movable plate; 11. Guide groove; 2. Interlocking plate; 3. Micro switch; 4. Linkage component; 5. Limiting component. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] Please see the appendix Figure 1 -Appendix Figure 4The first aspect of this embodiment relates to an interlocking mechanism for interlocking an isolating grounding switch 100 and a circuit breaker 200. Specifically, the interlocking mechanism includes a movable plate 1 and an interlocking plate 2. The movable plate 1 is connected to the operating valve 110 of the isolating grounding switch 100 and has a first state with the operating valve 110 open and a second state with the operating valve 110 closed. The interlocking plate 2 is located inside the circuit breaker 200 and is tractively connected to the movable plate 1. When the circuit breaker 200 is closed, the crank arm 210 of the circuit breaker 200 abuts against the interlocking plate 2, so that the interlocking plate 2 restricts the movable plate 1 from switching from the second state to the first state. When the movable plate 1 switches from the second state to the first state, the movable plate 1 drives the interlocking plate 2, so that the interlocking plate 2 restricts the circuit breaker 200 from closing.

[0034] Specifically, the operator can operate the isolating grounding switch 100 through the operating valve 110. The isolating grounding switch 100 is provided with an insertion hole 120 for inserting the operating handle. The operating valve 110 can control the opening and closing of the insertion hole 120. The movable plate 1 is connected to the operating valve 110. The operator can directly face the movable plate 1 to operate the operating valve 110 to open and close the operating valve 110, thereby opening and closing the insertion hole 120. The circuit breaker 200 is provided with an interlocking plate 2 inside. The interlocking plate 2 is connected to the movable plate 1 through the linkage 4.

[0035] In this embodiment, when the circuit breaker 200 is closed, the interlocking mechanism uses the crank arm 210, a moving component in the closing mechanism of the circuit breaker 200, to abut against the interlocking plate 2, thereby preventing the interlocking plate 2 from moving. This further restricts the movement of the movable plate 1 and prevents it from being linked to open the operating valve 110. Therefore, the operating valve 110 is always in the closed second state when the circuit breaker 200 is closed, and the insertion hole 120 is always closed, thereby preventing the operator from accidentally inserting the operating handle into the insertion hole 120 and ensuring operational safety.

[0036] Furthermore, when it is necessary to operate the isolating grounding switch 100, the operator first operates the movable plate 1 to switch it to the first open state. At this time, the movable plate 1 drives the interlocking plate 2 to move through the linkage 4, so that the interlocking plate 2 abuts against the bending plate 220 of the operating mechanism, thereby restricting the rotation of the bending plate 220 and preventing the circuit breaker 200 from closing.

[0037] This interlocking mechanism enables the interlocking operation of the isolating grounding switch 100 and the circuit breaker 200, thereby ensuring the safety of operators. Furthermore, the interlocking function of the isolating grounding switch 100 and the circuit breaker 200 can be achieved solely through the movable plate 1 and the interlocking plate 2, requiring fewer parts and having minimal impact on changes to the overall structure of the isolating grounding switch 100 and the circuit breaker 200, resulting in low cost.

[0038] Optionally, this interlocking mechanism also includes a micro switch 3 installed on the isolating grounding switch 100. When the movable plate 1 switches from the second state to the first state, the movable plate 1 can trigger the micro switch 3, and the micro switch 3 is connected to the relay protection device. When the movable plate 1 triggers the micro switch 3, the relay protection device can block the closing signal of the circuit breaker 200.

[0039] In this embodiment, the movable plate 1 has an abutting structure for cooperating with the button of the micro switch 3 to achieve a triggering action. When the movable plate 1 switches the operating valve 110 from the closed state to the open state, the isolating grounding switch 100 can be operated. During the process of lifting the movable plate 1 upward, the micro switch 3 can be further triggered, thereby enabling the relay protection device to obtain a signal and further blocking the closing signal of the circuit breaker 200. This prevents the operator from remotely inputting a closing signal to the circuit breaker 200 through the relay protection device, thus blocking the remote closing of the circuit breaker 200. This achieves the electrical interlocking function that prevents the circuit breaker 200 from performing a closing operation when the isolating grounding switch 100 is operated.

[0040] Furthermore, when the circuit breaker 200 is closed, the crank arm 210 pulls the connecting plate to switch the changeover switch, causing a change in the signal output to the relay protection device. This causes the relay protection device to display the status of the circuit breaker 200 as closed, while simultaneously shielding the electric operation signal of the isolating grounding switch 100, preventing it from being electrically operated. This achieves the electrical interlocking function that prevents the isolating grounding switch 100 from being operated when the circuit breaker 200 is closed.

[0041] Optionally, the interlocking mechanism also includes a linkage 4, which is flexible, with one end connected to the movable plate 1 and the other end connected to the interlocking plate 2.

[0042] In this embodiment, the linkage 4 can be a cable, and the flexible cable can adapt to the linkage position requirements of the movable plate 1 and the interlocking plate 2. Specifically, one end of the linkage 4 is screwed onto the movable plate 1 with a bolt and nut, and the other end of the linkage 4 is also screwed onto the interlocking plate 2. When the isolating grounding switch 100 needs to be operated, the operator first pulls the movable plate 1 upward. The movable plate 1 drives the interlocking plate 2 to move through the cable, so that the interlocking plate 2 abuts against the bent plate 220 of the operating mechanism, thereby restricting the rotation of the bent plate 220 and preventing the circuit breaker 200 from closing. When the circuit breaker 200 closes, the crank arm 210 in the closing mechanism of the circuit breaker 200 abuts against the interlocking plate 2, so that the interlocking plate 2 cannot move upward. At this time, the cable restricts the upward movement of the movable plate 1 and prevents it from being linked to open the operating valve 110.

[0043] Optionally, the interlocking mechanism also includes a limiting element 5, which is disposed on the circuit breaker 200, and the linkage element 4 passes through the limiting element 5.

[0044] In this embodiment, the limiting member 5 is provided with a through hole so that the linkage member 4 can pass through. Since the linkage member 4 is flexible and lacks support, the limiting member 5 can constrain the linkage member 4 so as to facilitate the positioning of the linkage member 4.

[0045] Furthermore, the movable plate 1 is connected to the operating end of the operating valve 110. When the movable plate 1 is switched to the first state, the movable plate 1 drives the operating end to open the insertion hole 120 of the isolation grounding switch 100; when the movable plate 1 is switched to the second state, the movable plate 1 drives the operating end to close the insertion hole 120.

[0046] Specifically, the movable plate 1 and the operating valve 110 can be connected by fasteners or snap-fit. When the movable plate 1 is lifted upwards, it moves the operating end of the operating valve 110 and simultaneously releases the obstruction of the insertion hole 120. When the circuit breaker 200 is closed, the movable plate 1 cannot be lifted, and it always blocks the insertion hole 120.

[0047] Optionally, the movable plate 1 is provided with a guide groove 11, and the isolation grounding switch 100 is provided with a guide member 130, which slides in the guide groove 11.

[0048] In this embodiment, the movable plate 1 can slide in the vertical direction. Through the sliding cooperation of the guide member 130 and the guide groove 11, the movement of the movable plate 1 in the vertical direction can be guided, ensuring the accuracy of the movement.

[0049] The second aspect of this embodiment also relates to a switch cabinet including an isolating grounding switch 100, a circuit breaker 200, and an interlocking mechanism.

[0050] Switchgear equipped with this interlocking mechanism can realize the interlocking function, thereby ensuring the safety and reliability of operation.

[0051] Optionally, the crank arm 210 is provided with a limiting boss 211, which can abut against the interlocking plate 2.

[0052] In this embodiment, the crank arm 210 is a moving component in the closing mechanism of the circuit breaker 200. The crank arm 210 is provided with a cylindrical limiting boss 211. Through the rotation of the crank arm 210, the side wall of the limiting boss 211 can accurately abut against the interlocking plate 2, thereby restricting the movement of the interlocking plate 2. The limiting boss 211 can be fixed to the crank arm 210 by interference fit or screw connection.

[0053] Optionally, the circuit breaker 200 includes an operating mechanism for closing the circuit breaker 200. The operating mechanism includes a bend plate 220, and the interlocking plate 2 can abut against the bend plate 220 to restrict the movement of the operating mechanism.

[0054] In this embodiment, for the circuit breaker 200 to perform a closing operation, the closing half-shaft 230 needs to rotate, and the bent plate 220 can drive the closing half-shaft 230 to rotate. During the operation of the isolating grounding switch 100, the movable plate 1 is always in an upward state. The movable plate 1 drives the linkage 4, and the linkage 4 pulls the interlocking plate 2 upward. The other end of the interlocking plate 2 directly abuts against the bent plate 220, preventing the bent plate 220 from rotating. The bent plate 220 cannot further drive the closing half-shaft 230 to rotate, thereby restricting the movement of the operating mechanism when operating the isolating grounding switch 100. Therefore, the circuit breaker 200 cannot be closed.

[0055] It should be noted that when circuit breaker 200 needs to be closed, a closing signal can be remotely input via a relay protection device. If circuit breaker 200 does not output a closing signal, the relay protection device will continuously input a closing signal, keeping the closing coil energized for an extended period, which can lead to coil burnout in severe cases. To address this issue, when operating the isolating grounding switch 100, during the upward movement of the movable plate 1, the microswitch 3 is triggered to output a signal indicating that the isolating grounding switch 100 is operating. Upon receiving this signal, the relay protection device can block the closing signal of circuit breaker 200, thus achieving electrical interlocking.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An interlocking mechanism for isolating interlocking of a grounding switch (100) and a circuit breaker (200), characterized in that, include: A movable plate (1) is connected to the operating valve (110) of the isolation grounding switch (100). The movable plate (1) has a first state of opening the operating valve (110) and a second state of closing the operating valve (110). Interlocking plate (2) is located inside the circuit breaker (200), and the interlocking plate (2) is connected to the movable plate (1) in a transmission manner; When the circuit breaker (200) is closed, the crank arm (210) of the circuit breaker (200) abuts against the interlocking plate (2) so that the interlocking plate (2) restricts the movable plate (1) from switching from the second state to the first state; when the movable plate (1) switches from the second state to the first state, the movable plate (1) drives the interlocking plate (2) so that the interlocking plate (2) restricts the circuit breaker (200) from closing.

2. The interlock mechanism of claim 1, wherein, The interlocking mechanism also includes a micro switch (3) installed on the isolation grounding switch (100). When the movable plate (1) switches from the second state to the first state, the movable plate (1) can trigger the micro switch (3). The micro switch (3) is connected to the relay protection device.

3. The interlock mechanism of claim 2, wherein, When the movable plate (1) triggers the micro switch (3), the relay protection device can block the closing signal of the circuit breaker (200).

4. The interlock mechanism of claim 1, wherein, The interlocking mechanism also includes a linkage component (4), which is flexible. One end of the linkage component (4) is connected to the movable plate (1), and the other end is connected to the interlocking plate (2).

5. The interlock mechanism of claim 4, wherein, The interlocking mechanism also includes a limiting member (5), which is disposed on the circuit breaker (200), and the linkage member (4) passes through the limiting member (5).

6. The interlock mechanism of claim 1, wherein, The movable plate (1) is connected to the operating end of the operating valve (110). When the movable plate (1) is switched to the first state, the movable plate (1) drives the operating end to open the handle insertion hole (120) of the isolation grounding switch (100). When the movable plate (1) is switched to the second state, the movable plate (1) drives the operating end to close the handle insertion hole (120).

7. The interlock mechanism of claim 1, wherein, The movable plate (1) is provided with a guide groove (11), and the isolation grounding switch (100) is provided with a guide member (130), which slides in the guide groove (11).

8. Switchgear, characterized in that It includes an isolating grounding switch (100), a circuit breaker (200), and an interlocking mechanism as described in any one of claims 1-7.

9. Switchgear according to claim 8, characterized in that The crank arm (210) is provided with a limiting boss (211), which can abut against the interlocking plate (2).

10. Switchgear according to claim 8, characterized in that The circuit breaker (200) includes an operating mechanism for closing the circuit breaker (200). The operating mechanism includes a bend plate (220), and the interlocking plate (2) can abut against the bend plate (220) to restrict the movement of the operating mechanism.

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