A five-proof interlocking mechanism for upper isolating switchgear

Abstract

This utility model provides a five-proof interlocking mechanism for an upper disconnect switchgear, comprising: a closing half-shaft, rotatably mounted on a first housing, with a first interlocking plate fixedly mounted on the closing half-shaft and rotating therewith; an isolation operating shaft and a grounding operating shaft, both rotatably mounted on a second housing, with a first cam fixedly mounted on both the isolation operating shaft and the grounding operating shaft and rotating therewith; and a second interlocking plate, movably mounted on the first and second housings, having a first locking plate portion and a second locking plate portion that are bent and connected in an inverted L-shape, the first locking plate portion having a first protrusion plate that cooperates with the first cam, and the bottom of the second locking plate portion having a first locking block that cooperates with the first interlocking plate; when the disconnect switch is in the open position, the first locking block cooperates with the first interlocking plate to lock, thereby preventing the closing half-shaft from rotating in the closing direction.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, specifically to a five-proof interlocking mechanism for an upper isolating switchgear. Background Technology

[0002] Switchgear, as the core equipment for distributing, controlling, and protecting electrical energy in power systems, is widely used in substations, industrial and mining enterprises, and building power distribution. It typically contains key components such as circuit breakers, disconnect switches, and grounding switches, operating at high voltages and handling large currents. To ensure the safety of operators and the stable operation of power grid equipment, national mandatory standards require switchgear to possess comprehensive "five-proof" interlocking functions. However, existing switchgear interlocking mechanisms for achieving these five-proof functions generally suffer from complex structures. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defects in the prior art, thereby providing a five-proof interlocking mechanism for an upper isolating switch cabinet with a simple structure.

[0004] Therefore, this utility model provides a five-proof interlocking mechanism for an upper disconnect switchgear, including a closing half-shaft, an isolation operating shaft, a grounding operating shaft, and a second interlocking plate. The closing half-shaft is rotatably mounted on a first housing, and a first interlocking plate that rotates in conjunction with it is fixedly mounted on the closing half-shaft. The isolation operating shaft and the grounding operating shaft are both rotatably mounted on a second housing, and a first cam that rotates in conjunction with them is fixedly mounted on both the isolation operating shaft and the grounding operating shaft. The second interlocking plate is movably mounted on the first housing and the second housing, and has a first locking plate portion and a second locking plate portion that are bent and connected in an inverted L-shape. The first locking plate portion has a first protrusion that cooperates with the first cam, and the bottom of the second locking plate portion has a first locking block that cooperates with the first interlocking plate. When the disconnect switch is in the open position, the first locking block cooperates with the first interlocking plate to lock, thereby preventing the closing half-shaft from rotating in the closing direction.

[0005] The second interlocking plate is connected to the second housing through a guide structure, the guide structure including a guide hole on the first locking plate and a guide post on the second housing that cooperates with the guide hole.

[0006] It also includes a first spring, one end of which is connected to the first convex plate and the other end of which is connected to the guide post. The first spring is used to apply an elastic force toward the second interlocking plate in the direction of the locking position.

[0007] It also includes: an output shaft, driven by the closing half-shaft and used to drive the circuit breaker to close, wherein a second cam is fixedly provided on the output shaft; and a third interlocking plate, movably mounted on the first housing and the second housing, wherein the third interlocking plate has a first baffle located at its top for shielding the isolation operating shaft and the grounding operating shaft, and a second convex plate located at its bottom for cooperating with the second cam.

[0008] It also includes: a fourth interlocking plate, fixedly mounted on the grounding operating shaft; and a door interlocking plate, movably mounted on the first housing and the second housing, having a third protruding plate at the top and a locking rod at the bottom that cooperates with the lower door; when the disconnecting switch is in the open or closed position, the fourth interlocking plate abuts against the third protruding plate to prevent the lower door from opening; when the disconnecting switch is in the grounded position, the fourth interlocking plate separates from the third protruding plate.

[0009] The top of the door interlock plate is also provided with a second baffle for blocking the grounding operation shaft. The door interlock plate has a first position to prevent the lower door from opening, and a second position for blocking the grounding operation shaft after the lower door is opened.

[0010] It also includes a second spring, one end of which is connected to the second housing and the other end of which is connected to the door interlock plate. The second spring applies an elastic force toward the door interlock plate in the direction of the second position.

[0011] It also includes: a tripping half-shaft, rotatably mounted on the first housing, with a fifth interlocking plate fixedly mounted on the tripping half-shaft and rotating therewith; a third locking plate, located on the door interlocking plate, which can cooperate with the fifth interlocking plate; after the circuit breaker is tripped, the isolating switch is grounded, and the circuit breaker is closed in a set sequence, the third locking plate abuts against the fifth interlocking plate to prevent the tripping half-shaft from moving toward the tripping position.

[0012] The technical solution of this utility model has the following advantages:

[0013] 1. The five-proof interlocking mechanism provided by this utility model, through the mechanical hard locking of the first interlocking plate and the first locking block, completely blocks the rotation of the closing half shaft when the disconnecting switch is opened. The inverted L-shaped second interlocking plate can synchronously cooperate with the first cam of the grounding operation shaft and the isolation operation shaft, which has the advantage of simple structure.

[0014] 2. The five-proof interlocking mechanism provided by this utility model, when the circuit breaker is closed, the output shaft drives the third interlocking plate to move upward through the second cam, so that the first baffle of the third interlocking plate blocks the operating holes of the isolation operating shaft and the grounding operating shaft, thus avoiding misoperation. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a front view of the five-proof interlocking mechanism of this utility model;

[0017] Figure 2 A three-dimensional diagram of the five-prevention interlocking mechanism;

[0018] Figure 3 This is a partial 3D view of the five-prevention interlocking mechanism;

[0019] Figure 4 This is a structural diagram of the five-prevention interlocking mechanism (third interlocking plate);

[0020] Figure 5 A three-dimensional diagram of the five-prevention interlocking mechanism (door interlocking plate);

[0021] Figure 6 for Figure 5 A magnified structural diagram of part A in the middle;

[0022] Figure 7 for Figure 5 A magnified structural diagram of part B in the middle section;

[0023] Figure 8 A three-dimensional view of the five-prevention interlocking mechanism (door interlocking plate) after removing the second baffle;

[0024] Figure 9 This is a 3D view of the door interlock plate.

[0025] Explanation of reference numerals in the attached drawings: 1. First housing; 2. Second housing; 3. Closing half-shaft; 4. First interlocking plate; 5. Isolation operating shaft; 6. Grounding operating shaft; 7. First cam; 8. Second interlocking plate; 9. First locking plate section; 10. Second locking plate section; 11. First protruding plate; 12. First locking block; 13. Guide hole; 14. Guide post; 15. First spring; 16. Output shaft; 17. Second cam; 18. Third interlocking plate; 19. First baffle; 20. Second protruding plate; 21. Fourth interlocking plate; 22. Door interlocking plate; 23. Third protruding plate; 24. Locking rod section; 25. Second baffle; 26. Second spring; 27. Opening half-shaft; 28. Fifth interlocking plate; 29. ​​Third locking plate section. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.

[0029] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] Example

[0031] This embodiment provides a five-proof interlocking mechanism for an upper isolating switchgear, such as... Figure 1 As shown, it includes a closing half-shaft 3, a opening half-shaft 27, an output shaft 16, an isolation operation shaft 5, and a grounding operation shaft 6.

[0032] The closing half-shaft 3 is rotatably mounted on the first housing 1 and is used to drive the circuit breaker to close, such as... Figure 2 As shown, a first interlocking plate 4 is fixedly installed on the closing half shaft 3 and rotates in conjunction with it.

[0033] The tripping half-shaft 27 is rotatably mounted on the first housing 1, such as... Figure 7 As shown, a fifth interlocking plate 28 is fixedly installed on the half-shaft 27 and rotates in conjunction with it.

[0034] Both the isolating operating shaft 5 and the grounding operating shaft 6 are rotatably mounted on the second housing 2. The isolating operating shaft 5 is used to drive the isolating switch to switch between the open and closed positions, and the grounding operating shaft 6 is used to drive the isolating switch to switch between the open and grounded positions. Figure 3 and Figure 4 As shown, both the isolation operating shaft 5 and the grounding operating shaft 6 are fixedly equipped with a first cam 7 that rotates in conjunction with it. A fourth interlocking plate 21 is fixedly installed on the grounding operating shaft 6.

[0035] The second interlocking plate 8 is mounted on the first housing 1 and the second housing 2, which can be moved up and down by the first spring 15. Figure 3 and Figure 4 As shown, it has a first locking plate portion 9 and a second locking plate portion 10 connected in an inverted L-shape. The first locking plate portion 9 has a first protruding plate 11 that cooperates with the first cam 7, and the bottom of the second locking plate portion 10 has a first locking block 12 that cooperates with the first interlocking plate 4. The second interlocking plate 8 is connected to the second housing 2 through a guide structure. The guide structure includes a guide hole 13 on the first locking plate portion 9 and a guide post 14 on the second housing 2 that cooperates with the guide hole 13. One end of the first spring 15 is connected to the first protruding plate 11, and the other end is connected to the guide post 14. The first spring 15 is used to apply an elastic force to the second interlocking plate 8 in the direction of locking. When the disconnecting switch is in the open position, the first locking block 12 cooperates with the first interlocking plate 4 to lock, thereby preventing the closing half-shaft 3 from rotating in the closing direction.

[0036] like Figure 4 As shown, the output shaft 16 is driven by the closing half-shaft 3 and is used to drive the main shaft of the circuit breaker to open or close. The output shaft 16 is fixedly provided with a second cam 17. It should be noted that the transmission mechanism between the closing half-shaft 3, the opening half-shaft and the output shaft 16 is a mature existing technology, so the specific structure and working principle of the transmission mechanism will not be described in detail.

[0037] The third interlocking plate 18 is mounted on the first housing 1 and the second housing 2, which can be moved up and down by a third spring. Figure 4 As shown, the third interlocking plate 18 has a first baffle 19 located at its top for shielding the isolating operating shaft 5 and the grounding operating shaft 6, and a second protrusion 20 located at its bottom for engaging with the second cam 17. When the circuit breaker is closed, the second cam 17 of the output shaft 16 rotates clockwise, thereby driving the third interlocking plate 18 to move upward. At this time, the third spring (not shown in the figure) stores energy, and the first baffle 19 can shield the isolating operating shaft 5 and the grounding operating shaft 6, thereby preventing misoperation.

[0038] Door interlock plate 22, such as Figure 5 As shown, the door interlock plate 22 is movably mounted on the first housing 1 and the second housing 2 via a second spring 26. The door interlock plate 22 has a first position to prevent the lower door from opening, and a second position to block the grounding operation shaft 6 after the lower door is opened. Figure 6 and Figure 8 As shown, the door interlock plate 22 has a third protruding plate 23 and a second baffle 25 located at the top, and a locking rod part 24 located at the bottom that cooperates with the lower door (the locking between the locking rod part 24 and the lower door is a mature existing technology, so its specific structure and working principle will not be described in detail). When the disconnecting switch is in the open or closed position, such as Figure 8 As shown, the fourth interlocking plate 21 abuts against the third protruding plate 23 to prevent the lower door from opening; when the disconnect switch is in the grounded position, the fourth interlocking plate 21 separates from the third protruding plate 23; after the lower door is opened, the second baffle 25 can block the operating hole of the grounding operating shaft 6, thereby avoiding misoperation. Figure 7 and Figure 9 As shown, the door interlock plate 22 is also provided with a third locking plate part 29 that can cooperate with the fifth interlock plate 28. It should be noted that the solution of this application adopts "upper isolation", that is, the busbar passes through the disconnecting switch and the circuit breaker to the load in sequence. When maintenance and repair are required on the load side, the circuit breaker needs to be opened first, and then the disconnecting switch needs to be grounded. In order to eliminate possible induced voltage or residual charge on the load side, the circuit breaker needs to be closed again to ensure that the load side is grounded. Therefore, when the door is opened, the door interlock plate 22 moves upward, and the third locking plate part 29 moves to cooperate with the fifth interlock plate 28, thereby preventing the circuit breaker from opening.

[0039] The five-proof interlocking mechanism provided by this utility model, through the mechanical hard locking of the first interlocking plate 4 and the first locking block 12, completely blocks the rotation of the closing half shaft 3 when the disconnecting switch is opened. The inverted L-shaped second interlocking plate 8 can synchronously cooperate with the first cam 7 of the grounding operation shaft 6 and the isolation operation shaft 5, which has the advantage of simple structure.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A five-prevention interlocking mechanism of an on-off switchgear cabinet, characterized in that, include: The closing half shaft (3) is rotatably mounted on the first housing (1), and the closing half shaft (3) is fixedly provided with a first interlocking plate (4) that rotates in conjunction with it; The isolation operation shaft (5) and the grounding operation shaft (6) are both rotatably mounted on the second housing (2), and the isolation operation shaft (5) and the grounding operation shaft (6) are both fixedly provided with a first cam (7) that rotates in conjunction with them; The second interlocking plate (8) is movably mounted on the first housing (1) and the second housing (2). It has a first locking plate portion (9) and a second locking plate portion (10) that are bent and connected in an inverted L shape. The first locking plate portion (9) is provided with a first protrusion plate (11) that cooperates with the first cam (7). The bottom of the second locking plate portion (10) is provided with a first locking block (12) that cooperates with the first interlocking plate (4). When the disconnecting switch is in the open position, the first locking block (12) cooperates with the first interlocking plate (4) to lock and prevent the closing half shaft (3) from rotating in the closing direction.

2. The five-prevention interlocking mechanism of the upper disconnecting switch cabinet according to claim 1, characterized in that, The second interlocking plate (8) is connected to the second housing (2) through a guide structure. The guide structure includes a guide hole (13) provided on the first locking plate (9) and a guide post (14) provided on the second housing (2) and cooperating with the guide hole (13).

3. The five-prevention interlocking mechanism of the upper disconnecting switch cabinet according to claim 2, characterized in that, It also includes a first spring (15), one end of which is connected to the first protrusion (11) and the other end is connected to the guide post (14). The first spring (15) is used to apply an elastic force to the second interlocking plate (8) to move in the locking position direction.

4. The five-prevention interlocking mechanism of the upper disconnecting switch cabinet according to any one of claims 1-3, characterized in that, Also includes: The output shaft (16) is driven by the closing half shaft (3) and is used to drive the circuit breaker to close. A second cam (17) is fixedly provided on the output shaft (16). The third interlocking plate (18) is movably mounted on the first housing (1) and the second housing (2). The third interlocking plate (18) has a first baffle (19) located on its top for shielding the isolation operating shaft (5) and the grounding operating shaft (6), and a second convex plate (20) located at its bottom for cooperating with the second cam (17).

5. The five-prevention interlocking mechanism of the upper disconnecting switch cabinet according to claim 1, characterized in that, Also includes: The fourth interlock plate (21) is fixedly installed on the grounding operating shaft (6); The door interlock plate (22) is movably mounted on the first housing (1) and the second housing (2), and has a third protrusion (23) at the top and a locking rod (24) at the bottom that engages with the lower door. When the disconnecting switch is in the open or closed position, the fourth interlocking plate (21) abuts against the third protruding plate (23) to prevent the lower door from opening; When the disconnecting switch is in the grounded position, the fourth interlocking plate (21) separates from the third protruding plate (23).

6. The five-prevention interlocking mechanism of the upper disconnecting switch cabinet according to claim 5, characterized in that, The top of the door interlock plate (22) is also provided with a second baffle (25) for blocking the grounding operation shaft (6). The door interlock plate (22) has a first position to prevent the lower door from opening, and a second position for blocking the grounding operation shaft (6) after the lower door is opened.

7. The five-prevention interlocking mechanism of the upper disconnecting switch cabinet according to claim 6, characterized in that, It also includes a second spring (26), one end of which is connected to the second housing (2) and the other end is connected to the door interlock plate (22). The second spring (26) applies an elastic force to the door interlock plate (22) to move in the direction of the second position.

8. The five-prevention interlocking mechanism of the upper disconnecting switch cabinet according to claim 5, characterized in that, Also includes: The tripping half shaft (27) is rotatably mounted on the first housing (1), and a fifth interlocking plate (28) that rotates in conjunction with it is fixedly provided on the tripping half shaft (27); The third locking plate (29) is provided on the door interlocking plate (22) and can cooperate with the fifth interlocking plate (28); After the circuit breaker is opened, the disconnector is grounded, and the circuit breaker is closed in the set sequence, the third locking plate (29) abuts against the fifth interlocking plate (28) to prevent the opening half shaft (27) from moving toward the opening position.

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