Mechanical interlocking device for circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a mechanical interlocking device for a circuit breaker, which comprises three interlocking units which are connected through transmission steel cables. The interlocking unit comprises a mounting plate, a left swing arm, a right swing arm, an arc-shaped cantilever, a tripping control arm and a transmission arm; the transmission arm of the first interlocking unit is connected with the left swing arm of the second interlocking unit and the right swing arm of the third interlocking unit through a transmission steel cable; the transmission arm of the second interlocking unit is connected with the right swing arm of the first interlocking unit and the left swing arm of the third interlocking unit through a transmission steel cable; the transmission arm of the third interlocking unit is connected with the left swing arm of the first interlocking unit and the right swing arm of the second interlocking unit through a transmission steel cable. According to the invention, at most two circuit breakers can be switched on at any time, the use is safe, the left swing arm and the right swing arm are directly driven to act through the transmission steel cable, the tripping force is determined, and the operation is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a mechanical interlocking device for a circuit breaker. Background Art

[0002] The mechanical interlocking device is an accessory of an air circuit breaker, which is used to control the interlocking opening and closing of circuit breakers in a two-way or multi-way power distribution system, providing safety guarantee for the multi-way power supply system. The mechanical interlocking device is generally installed on the side plate of the circuit breaker, and the mechanical interlocking devices are connected by a steel cable, so as to realize the interlocking control between the circuit breakers. In order to ensure the reliability of the mechanical interlocking, the steel cable after installation and adjustment must be locked by a locking device to prevent the steel cable from loosening, which may lead to unreliable interlocking process and affect the safety of the entire power distribution system.

[0003] In the existing patent, the Chinese patent document with the application number 201620359959.9 discloses a locking device for a mechanical interlocking steel cable of a circuit breaker, which includes an interlocking steel cable and a locking nut. The interlocking steel cable is installed around the roller of the linkage rod of the circuit breaker. The linkage rod is drivingly connected with the operating mechanism of the circuit breaker. One side of the interlocking steel cable relative to the roller is a steel cable locking part for locking the interlocking steel cable, and the other side of the interlocking steel cable relative to the roller is a steel cable linkage part for mechanical interlocking between the circuit breakers. The locking nut is provided with installation through holes side by side. The steel cable locking part and the steel cable linkage part respectively pass through the side-by-side arranged installation through holes. The locking nut is also provided with a locking through hole on one side of the installation through hole. The steel cable locking part is provided with a locking bending part, and the locking bending part is installed in the locking through hole. Locking screws for locking the steel cable locking part and the steel cable linkage part are respectively arranged on the installation through hole and the locking through hole. The linkage rod includes a first linkage rod, a second linkage rod, a third linkage rod and a fourth linkage rod which are respectively rotatably installed on the installation plate on the side plate of the circuit breaker. The first linkage rod is arranged on one side of the installation plate, and rollers are respectively arranged at both ends of the first linkage rod. The second linkage rod, the third linkage rod and the fourth linkage rod are arranged on the other side of the installation plate and are in transmission contact connection in sequence. A roller is arranged at one end of the second linkage rod close to the third linkage rod, and a roller is arranged at one end of the fourth linkage rod close to the third linkage rod. An interlocking steel cable is locked and installed on each roller through a locking nut, and a steel cable sheath is fixedly installed on the edge of the installation plate. The steel cable linkage part of the interlocking steel cable passes through the installation plate through the steel cable sheath. A return spring is also arranged between the second linkage rod, the third linkage rod, the fourth linkage rod and the installation plate.

[0004] In the application of this patent document, after the second linkage rod and the fourth linkage rod release the third linkage rod, the third linkage rod is pulled and rotated by the elastic force of the return spring to trip the tripping mechanism of the circuit breaker, resulting in poor tripping stability. Moreover, when the third linkage rod is used to latch the tripping mechanism of the circuit breaker, it is necessary for the three return springs on the second linkage rod, the third linkage rod, and the fourth linkage rod to cooperate to complete the operation. Therefore, during the production process, it is necessary to calculate the acting forces of these three return springs during operation to ensure that the corresponding resistance can be overcome to complete the tripping or latching action. Summary of the Invention

[0005] In order to solve the above technical problems, the purpose of the present utility model is to provide a mechanical interlocking device for a circuit breaker.

[0006] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0007] A mechanical interlocking device for a circuit breaker includes three interlocking units. The three interlocking units are respectively connected to the transmissions of three circuit breakers, and the interlocking units are connected to each other by transmission steel cables. Each interlocking unit includes a mounting plate, a left swing arm, a right swing arm, an arc-shaped cantilever, a tripping control arm, and a transmission arm. Left and right arc-shaped grooves are respectively provided at both ends of the arc-shaped cantilever. The middle part of the left swing arm is rotatably connected to the mounting plate. One end of the left swing arm is connected to the mounting plate via a left spring, and a left driving rod is installed at the other end of the left swing arm. The left driving rod is inserted into the left arc-shaped groove and abuts against the inner wall of the left arc-shaped groove. The middle part of the right swing arm is rotatably connected to the mounting plate. One end of the right swing arm is connected to the mounting plate via a right spring, and a right driving rod is installed at the other end of the right swing arm. The right driving rod is inserted into the right arc-shaped groove and abuts against the inner wall of the right arc-shaped groove. One end of the tripping control arm is rotatably connected to the mounting plate via a first rotating shaft, and a tripping link is installed at the other end of the tripping control arm. The tripping link is used to abut against the inner arc surface of the arc-shaped cantilever. A first torsion spring is sleeved on the first rotating shaft, and both ends of the first torsion spring are respectively connected to the mounting plate and the tripping control arm. The first torsion spring is used to drive the tripping control arm to reset. One end of the transmission arm is rotatably connected to the mounting plate via a second rotating shaft. A second torsion spring is sleeved on the second rotating shaft, and both ends of the second torsion spring are respectively connected to the mounting plate and the transmission arm. The second torsion spring is used to drive the transmission arm to reset. The transmission arm of the first interlocking unit is connected to the left swing arm of the second interlocking unit and the right swing arm of the third interlocking unit via a transmission steel cable. The transmission arm of the second interlocking unit is connected to the right swing arm of the first interlocking unit and the left swing arm of the third interlocking unit via a transmission steel cable. The transmission arm of the third interlocking unit is connected to the left swing arm of the first interlocking unit and the right swing arm of the second interlocking unit via a transmission steel cable.

[0008] Furthermore, an upper limit member is installed on the mounting plate; when the first torsion spring is in an extended state, the upper limit member abuts against the upper side surface of the tripping control arm.

[0009] Furthermore, the mounting plate is provided with a lower limit member; when the second torsion spring is in the extended state, the lower limit member abuts against the lower side surface of the transmission arm.

[0010] Furthermore, the mounting plate is provided with an upper left limit member and a lower left limit member, and one end of the left swing arm away from the left drive rod is located between the upper left limit member and the lower left limit member.

[0011] Furthermore, the mounting plate is provided with an upper right limit member and a lower right limit member, and one end of the right swing arm away from the right drive rod is located between the upper right limit member and the lower right limit member.

[0012] Furthermore, the first rotating shaft is provided with a detaching member, and the detaching member and the detaching control arm are located on both sides of the mounting plate.

[0013] Furthermore, the second rotating shaft is provided with a dial plate, and the dial plate and the transmission arm are located on both sides of the mounting plate.

[0014] Advantages of the present utility model: A mechanical interlocking device for a circuit breaker, which includes three interlocking units. The three interlocking units are respectively connected to the transmissions of three circuit breakers, and the interlocking units are connected to each other by transmission steel cables; each interlocking unit includes a mounting plate, a left swing arm, a right swing arm, an arc-shaped cantilever, a tripping control arm, and a transmission arm. Left and right arc-shaped grooves are respectively provided at both ends of the arc-shaped cantilever. The middle of the left swing arm is rotatably connected to the mounting plate. One end of the left swing arm is connected to the mounting plate via a left spring. A left driving rod is installed at the other end of the left swing arm. The left driving rod is inserted into the left arc-shaped groove and abuts against the inner wall of the left arc-shaped groove. The middle of the right swing arm is rotatably connected to the mounting plate. One end of the right swing arm is connected to the mounting plate via a right spring. A right driving rod is installed at the other end of the right swing arm. The right driving rod is inserted into the right arc-shaped groove and abuts against the inner wall of the right arc-shaped groove. One end of the tripping control arm is rotatably connected to the mounting plate via a first rotating shaft. A tripping link is installed at the other end of the tripping control arm. The tripping link is used to abut against the inner arc surface of the arc-shaped cantilever. A first torsion spring is sleeved on the first rotating shaft. The two ends of the first torsion spring are respectively connected to the mounting plate and the tripping control arm. The first torsion spring is used to drive the tripping control arm to reset. One end of the transmission arm is rotatably connected to the mounting plate via a second rotating shaft. A second torsion spring is sleeved on the second rotating shaft. The two ends of the second torsion spring are respectively connected to the mounting plate and the transmission arm. The second torsion spring is used to drive the transmission arm to reset; the transmission arm of the first interlocking unit is connected to the left swing arm of the second interlocking unit and the right swing arm of the third interlocking unit via a transmission steel cable; the transmission arm of the second interlocking unit is connected to the right swing arm of the first interlocking unit and the left swing arm of the third interlocking unit via a transmission steel cable; the transmission arm of the third interlocking unit is connected to the left swing arm of the first interlocking unit and the right swing arm of the second interlocking unit via a transmission steel cable. The present utility model ensures that at most two circuit breakers can be closed at any time, with safe use. The left and right swing arms are directly driven to move by the transmission steel cable, so that the tripping force for the arc-shaped cantilever to drive the tripping mechanism of the circuit breaker to trip is determined, and the work is stable and reliable. Description of the Drawings

[0015] Figure 1 It is the front view of the present utility model.

[0016] Figure 2 It is the structural schematic diagram of the arc-shaped cantilever in the interlocking unit of the present utility model swinging to the left.

[0017] Figure 3 It is the structural schematic diagram of the arc-shaped cantilever in the interlocking unit of the present utility model moving downward.

[0018] Figure 4 It is the structural schematic diagram of the arc-shaped cantilever in the interlocking unit of the present utility model swinging to the right.

[0019] Figure 5 It is the three-dimensional structural schematic diagram of the present utility model.

[0020] Figure 6 This is a schematic perspective view of another angle of the present utility model.

[0021] Figure 7 This is an exploded structural schematic view of the left swing arm, arc-shaped cantilever and right swing arm of the present utility model.

[0022] Explanation of reference numerals in the drawings:

[0023] 1. Interlocking unit; 2. Mounting plate; 3. Left swing arm; 4. Right swing arm; 5. Arc-shaped cantilever; 6. Tripping control arm; 7. Transmission arm; 8. Left arc groove; 9. Right arc groove; 10. Left spring; 11. Left drive rod; 12. Right spring; 13. Right drive rod; 14. First rotating shaft; 15. Tripping connecting rod; 16. First torsion spring; 17. Second rotating shaft; 18. Second torsion spring; 19. Transmission steel cable; 20. Upper limit member; 21. Lower limit member; 22. Left upper limit member; 23. Left lower limit member; 24. Right upper limit member; 25. Right lower limit member; 26. Tripping member; 27. Dial plate. Detailed implementation manners

[0024] For the convenience of understanding by those skilled in the art, the present utility model will be further described below in conjunction with embodiments and the drawings. The content mentioned in the implementation manners does not limit the present utility model.

[0025] As Figures 1 to 7As shown in the figure, a mechanical interlocking device for a circuit breaker provided by the present utility model includes three interlocking units 1. The three interlocking units 1 are respectively connected to the transmissions of three circuit breakers, and the interlocking units 1 are connected to each other by a transmission steel cable 19. The interlocking unit 1 includes a mounting plate 2, a left swing arm 3, a right swing arm 4, an arc-shaped cantilever 5, a tripping control arm 6, and a transmission arm 7. Left and right arc-shaped grooves 8 and 9 are respectively arranged at both ends of the arc-shaped cantilever 5. The middle part of the left swing arm 3 is rotatably connected to the mounting plate 2. One end of the left swing arm 3 is connected to the mounting plate 2 via a left spring 10. A left driving rod 11 is installed at the other end of the left swing arm 3. The left driving rod 11 is inserted into the left arc-shaped groove 8 and abuts against the inner wall of the left arc-shaped groove 8. The left driving rod 11 can move within the left arc-shaped groove 8. The middle part of the right swing arm 4 is rotatably connected to the mounting plate 2. One end of the right swing arm 4 is connected to the mounting plate 2 via a right spring 12. A right driving rod 13 is installed at the other end of the right swing arm 4. The right driving rod 13 is inserted into the right arc-shaped groove 9 and abuts against the inner wall of the right arc-shaped groove 9. The right driving rod 13 can move within the right arc-shaped groove 9. One end of the tripping control arm 6 is rotatably connected to the mounting plate 2 via a first rotating shaft 14. A tripping link 15 is installed at the other end of the tripping control arm 6. The tripping link 15 is used to abut against the inner arc surface of the arc-shaped cantilever 5. A first torsion spring 16 is sleeved on the first rotating shaft 14. Both ends of the first torsion spring 16 are respectively connected to the mounting plate 2 and the tripping control arm 6. The first torsion spring 16 is used to drive the tripping control arm 6 to reset. One end of the transmission arm 7 is rotatably connected to the mounting plate 2 via a second rotating shaft 17. A second torsion spring 18 is sleeved on the second rotating shaft 17. Both ends of the second torsion spring 18 are respectively connected to the mounting plate 2 and the transmission arm 7. The second torsion spring 18 is used to drive the transmission arm 7 to reset. The transmission arm 7 of the first interlocking unit 1 is connected to the left swing arm 3 of the second interlocking unit 1 and the right swing arm 4 of the third interlocking unit 1 via the transmission steel cable 19. The transmission arm 7 of the second interlocking unit 1 is connected to the right swing arm 4 of the first interlocking unit 1 and the left swing arm 3 of the third interlocking unit 1 via the transmission steel cable 19. The transmission arm 7 of the third interlocking unit 1 is connected to the left swing arm 3 of the first interlocking unit 1 and the right swing arm 4 of the second interlocking unit 1 via the transmission steel cable 19. Specifically, a tripping part 26 is installed on the first rotating shaft 14. The tripping part 26 is used to connect to the tripping mechanism of the circuit breaker. The tripping part 26 and the tripping control arm 6 are located on both sides of the mounting plate 2. A dial 27 is installed on the second rotating shaft 17. The dial 27 is connected to the opening and closing switch of the circuit breaker. The dial 27 and the transmission arm 7 are located on both sides of the mounting plate 2.

[0026] In practical applications, circuit breaker A is connected to the first interlocking unit 1, circuit breaker B is connected to the second interlocking unit 1, and circuit breaker C is connected to the third interlocking unit 1. As Figure 1As shown in the figure, for example: when circuit breakers A and C are in the closed state, the drive arms 7 of the first interlocking unit 1 and the third interlocking unit 1 both rotate counterclockwise to the current position. The drive arm 7 of the first interlocking unit 1 respectively tightens the left swing arm 3 of the second interlocking unit 1 and the right swing arm 4 of the third interlocking unit 1 via the drive steel cable 19. The drive arm 7 of the third interlocking unit 1 respectively tightens the left swing arm 3 of the first interlocking unit 1 and the right swing arm 4 of the second interlocking unit 1 via the drive steel cable 19. The right swing arm 4 of the first interlocking unit 1 does not move and tightens the drive arm 7 of the second interlocking unit 1 via the drive steel cable 19. The left swing arm 3 of the third interlocking unit 1 does not move and tightens the drive arm 7 of the second interlocking unit 1 via the drive steel cable 19. And under the cooperation of the left drive rod 11 and the left arc groove 8 and the cooperation of the right drive rod 13 and the right arc groove 9, the arc-shaped cantilever 5 of the first interlocking unit 1 swings to the left and does not apply a force to the trip link 15 on the trip control arm 6. The trip control arm 6 of the first interlocking unit 1 does not move. The arc-shaped cantilever 5 of the third interlocking unit 1 swings to the right and does not apply a force to the trip link 15 on the trip control arm 6. The trip control arm 6 of the third interlocking unit 1 does not move. The arc-shaped cantilever 5 of the second interlocking unit 1 will move downward and apply a force to the trip link 15 on the trip control arm 6. The trip link 15 receiving the force drives the trip control arm 6 of the second interlocking unit 1 to swing counterclockwise, and the swinging trip control arm 6 will cause the circuit breaker B to be in the open state.

[0027] In the same interlocking unit 1, only when the left swing arm 3 and the right swing arm 4 are simultaneously tightened (actuated) to drive the arc-shaped cantilever 5 to move downward (actuated), will it drive the trip control arm 6 to swing counterclockwise (actuated), making the trip mechanism of the circuit breaker in the trip state, and the circuit breaker cannot be closed (in the open state).

[0028] In the same interlocking unit 1, if any one of the left swing arm 3 and the right swing arm 4 acts, the arc-shaped cantilever 5 can only swing to the corresponding single side and will not drive the trip control arm 6 to act, making the trip mechanism of the circuit breaker in the latched state, and the circuit breaker can be freely opened and closed.

[0029] The following table is the state mode diagram of the three circuit breakers when the present invention is in use:

[0030]

[0031] The present invention ensures that at most two circuit breakers can be closed at any time, with safe use. The left swing arm 3 and the right swing arm 4 are directly driven to act via the drive steel cable 19, so that the tripping force for the arc-shaped cantilever 5 to drive the trip mechanism of the circuit breaker to trip is determined, and the work is stable and reliable.

[0032] In this embodiment, the mounting plate 2 is provided with an upper limit member 20; when the first torsion spring 16 is in the extended state, the upper limit member 20 abuts against the upper side surface of the release control arm 6 to limit the release control arm 6. When the release control arm 6 swings counterclockwise, the release control arm 6 will separate from the upper limit member 20.

[0033] In this embodiment, the mounting plate 2 is provided with a lower limit member 21; when the second torsion spring 18 is in the extended state, the lower limit member 21 abuts against the lower side surface of the transmission arm 7 to limit the transmission arm 7. When the transmission arm 7 rotates counterclockwise, the transmission arm 7 will separate from the lower limit member 21.

[0034] In this embodiment, the mounting plate 2 is provided with an upper left limit member 22 and a lower left limit member 23, and the end of the left swing arm 3 far from the left driving rod 11 is located between the upper left limit member 22 and the lower left limit member 23. In practical applications, the upper left limit member 22 and the lower left limit member 23 play a role in limiting the left swing arm 3, and the left swing arm 3 can only swing between the upper left limit member 22 and the lower left limit member 23.

[0035] In this embodiment, the mounting plate 2 is provided with an upper right limit member 24 and a lower right limit member 25, and the end of the right swing arm 4 far from the right driving rod 13 is located between the upper right limit member 24 and the lower right limit member 25. In practical applications, the upper right limit member 24 and the lower right limit member 25 play a role in limiting the right swing arm 4, and the right swing arm 4 can only swing between the upper right limit member 24 and the lower right limit member 25.

[0036] All technical features in this embodiment can be freely combined according to actual needs.

[0037] The above embodiment is a preferred implementation scheme of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. A mechanical interlocking device for a circuit breaker, characterized in that: It includes three interlocking units (1), and the three interlocking units (1) are respectively connected to the drives of three circuit breakers. The interlocking units (1) are connected to each other by a transmission steel cable (19). The interlocking unit (1) includes a mounting plate (2), a left swing arm (3), a right swing arm (4), an arc-shaped cantilever (5), a trip control arm (6) and a transmission arm (7). At both ends of the arc-shaped cantilever (5), a left arc-shaped groove (8) and a right arc-shaped groove (9) are respectively provided. The middle of the left swing arm (3) is rotatably connected to the mounting plate (2). One end of the left swing arm (3) is connected to the mounting plate (2) via a left spring (10). The other end of the left swing arm (3) is provided with a left drive rod (11). The left drive rod (11) is inserted into the left arc-shaped groove (8) and abuts against the inner wall of the left arc-shaped groove (8). The middle of the right swing arm (4) is rotatably connected to the mounting plate (2). One end of the right swing arm (4) is connected to the mounting plate (2) via a right spring (12). The other end of the right swing arm (4) is provided with a right drive rod (13). The right drive rod (13) is inserted into the right arc-shaped groove (9) and abuts against the inner wall of the right arc-shaped groove (9). One end of the trip control arm (6) is rotatably connected to the mounting plate (2) via a first rotating shaft (14). The other end of the trip control arm (6) is provided with a trip link (15). The trip link (15) is used to abut against the inner arc surface of the arc-shaped cantilever (5). The first rotating shaft (14) is sleeved with a first torsion spring (16). The two ends of the first torsion spring (16) are respectively connected to the mounting plate (2) and the trip control arm (6). The first torsion spring (16) is used to drive the trip control arm (6) to reset. One end of the transmission arm (7) is rotatably connected to the mounting plate (2) via a second rotating shaft (17). The second rotating shaft (17) is sleeved with a second torsion spring (18). The two ends of the second torsion spring (18) are respectively connected to the mounting plate (2) and the transmission arm (7). The second torsion spring (18) is used to drive the transmission arm (7) to reset. The transmission arm (7) of the first interlocking unit (1) is connected to the left swing arm (3) of the second interlocking unit (1) and the right swing arm (4) of the third interlocking unit (1) via the transmission steel cable (19). The transmission arm (7) of the second interlocking unit (1) is connected to the right swing arm (4) of the first interlocking unit (1) and the left swing arm (3) of the third interlocking unit (1) via the transmission steel cable (19). The transmission arm (7) of the third interlocking unit (1) is connected to the left swing arm (3) of the first interlocking unit (1) and the right swing arm (4) of the second interlocking unit (1) via the transmission steel cable (19).

2. The mechanical interlocking device for a circuit breaker according to claim 1, characterized in that: The mounting plate (2) is provided with an upper limit member (20); when the first torsion spring (16) is in an extended state, the upper limit member (20) abuts against the upper side surface of the trip control arm (6).

3. The mechanical interlocking device for a circuit breaker according to claim 1, characterized in that: The mounting plate (2) is provided with a lower limit member (21); when the second torsion spring (18) is in an extended state, the lower limit member (21) abuts against the lower side surface of the transmission arm (7).

4. A mechanical interlocking device for a circuit breaker according to claim 1, characterized in that: The mounting plate (2) is provided with a left upper limit member (22) and a left lower limit member (23). One end of the left swing arm (3) away from the left drive rod (11) is located between the left upper limit member (22) and the left lower limit member (23).

5. The mechanical interlocking device for a circuit breaker according to claim 1, characterized in that: The mounting plate (2) is provided with a right upper limit member (24) and a right lower limit member (25), and one end of the right swing arm (4) away from the right drive rod (13) is located between the right upper limit member (24) and the right lower limit member (25).

6. The mechanical interlocking device for a circuit breaker according to claim 1, characterized in that: The first rotating shaft (14) is provided with a detaching member (26), and the detaching member (26) and the detaching control arm (6) are located on both sides of the mounting plate (2).

7. The mechanical interlocking device for a circuit breaker according to claim 1, characterized in that: The second rotating shaft (17) is provided with a dial plate (27), and the dial plate (27) and the transmission arm (7) are located on both sides of the mounting plate (2).

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