Locking device for isolating switch matched with 10KV pole-mounted vacuum circuit breaker

Abstract

The utility model discloses a locking device for a disconnecting switch matched with a 10KV pole-mounted vacuum circuit breaker, which relates to the field of outdoor power distribution equipment and comprises a locking shaft (8), an interlocking plate (9), a locking rod (10), a constant-angle locking plate (11) and a locking pin (12). According to the utility model, the locking plate structure with a constant rotation angle of 65 degrees is designed, the locking rotation angle is constant of 65 degrees, and the locking plate is provided with the locking rod free extension area and the locking rod backstop area, so that when the circuit breaker is switched on after the isolation knife is switched on, the locking structure avoids damage to the touch panel due to overlarge checking impact force; the engagement reliability of the contact and the contact plate is ensured; after the circuit breaker is switched on, the locking rod synchronously extends out, and the isolating knife cannot be manually switched off; when the circuit breaker is switched off, the isolating knife is switched off, the locking device avoids switching-off impact on the insulating pull rod, the structure is simple, the disc-shaped locking plate is attractive, high in strength performance, high in matching precision and reliable in locking, and the electricity utilization safety of power distribution equipment is greatly ensured.

Description

Technical Field

[0001] The utility model relates to the field of outdoor power distribution equipment, in particular to a locking device for a 10KV pole-mounted vacuum circuit breaker supporting an isolating switch. Background Art

[0002] 10kV pole mounted vacuum circuit breaker is a three-phase AC 50Hz outdoor power distribution equipment, mainly used for breaking and closing load current, overload current and short-circuit current in the power system. It is suitable for protection and control in substations and industrial and mining enterprises' power distribution systems, as well as places where rural power grids are frequently operated. The main function of the integrated isolating switch of the pole mounted vacuum circuit breaker is to switch the loaded high-voltage line and to electrically isolate the live high-voltage line from the high-voltage busbar or circuit breaker being repaired and other electrical equipment. The main feature of the isolating switch is that it has no arc extinguishing ability and can only open and close the circuit when there is no load current.

[0003] At present, the integrated disconnector for 10kV pole-mounted circuit breakers is mainly composed of a base frame, a pillar insulator, an insulating pull rod, a conductive component, a spring mechanism, etc. Its opening and closing operations are realized by the operator through the insulating pull rod through manual operation. The structure is external and interlocked with the arc extinguishing chamber. That is, when the circuit breaker is in the closed state, the disconnector is locked and cannot be opened manually.

[0004] The existing locking type of the matching isolation switch of this type has the following shortcomings:

[0005] 1. The locking adjustment angle is too small, resulting in a fracture distance of less than 200mm;

[0006] 2. The locking parts are not strong enough and have poor reliability. For example, the locking pin of the traditional housing is easily deformed by tension;

[0007] 3. The locking plate has poor design accuracy, large shaking, and the locking function is prone to failure. Summary of the invention

[0008] In order to solve the above-mentioned technical problems, the utility model provides a locking device for a 10KV pole-mounted vacuum circuit breaker supporting an isolating switch. The locking plate has a constant rotation angle, high matching accuracy, reliable locking performance, and effectively ensures the safety of power distribution equipment.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0010] A locking device for a 10KV pole-mounted vacuum circuit breaker supporting an isolating switch, wherein a base frame is fixedly arranged on the outlet side of the pole-mounted vacuum circuit breaker box for carrying the isolating switch, and the isolating switch is connected to the circuit breaker outlet copper rod through a conductive clip to form a primary circuit part, and the locking device comprises a locking shaft, an interlocking plate, a locking rod, a constant angle locking plate and a locking pin, wherein the constant angle locking plate is fixedly arranged at the end of the isolating switch shaft through an axis pin and rotates with the shaft, and the constant angle locking plate is arranged in a disc shape, and a 65° locking rotation area, a locking rod stop area and a locking rod free extension area are respectively arranged on the outer edge of the constant angle locking plate, and the locking pin is fixedly arranged on the base frame and corresponds to one end point of the 65° locking rotation area of ​​the constant angle locking plate, and the locking shaft is penetrated through the side wall of the circuit breaker housing and can rotate, and the part of the end thereof located on the inner side of the side wall of the circuit breaker housing is connected to the hanging The spring shaft is fixedly connected by a connecting plate, and the end portion of the locking shaft located on the outer side of the side wall of the circuit breaker housing is fixedly connected to the interlocking plate by a bolt, and the other end of the interlocking plate is fixedly connected to the locking rod. When the circuit breaker is closed, the driving pull rod inside the circuit breaker drives the hanging spring shaft to move forward, and the hanging spring shaft drives the locking shaft to rotate, and the interlocking plate rotates synchronously with the locking shaft. When the disconnector is closed, the rotating shaft drives the constant angle locking plate to rotate, and after rotating through an angle of 65°, it is restricted by the locking pin and stops rotating. The disconnector reaches the closed position, and then the circuit breaker is closed. The locking rod is driven by the interlocking plate to extend from the stop area of ​​the locking rod to achieve the opening stop; when the circuit breaker is opened, the driving pull rod drives the hanging spring shaft to move backward, and the hanging spring shaft drives the locking shaft to rotate. The locking rod is driven by the interlocking plate to retract in the stop area of ​​the locking rod, and then the disconnector can be opened. At this time, the locking rod can be extended in the free extension area of ​​the locking rod.

[0011] The 65° angle locking rotation area on the constant angle locking plate is set to form an angle of 65° between the starting point, the end point of the area and the center of the constant angle locking plate.

[0012] The angle between the locking rod stop area and the locking rod free extension area on the constant angle locking plate is set to 65°, and when the disconnector is closed, after the locking pin is limited, the locking rod stop area corresponds to the position of the locking rod, and when the disconnector is opened, after the locking pin is limited, the locking rod free extension area corresponds to the position of the locking rod.

[0013] The utility model designs a locking plate structure with a constant rotation angle of 65°, the locking rotation angle is constant at 65°, and a locking rod free extension area and a locking rod stop area are arranged on the locking plate. When the circuit breaker is closed after the isolation knife is closed, the locking structure avoids damage to the touch plate due to excessive impact force, thereby ensuring the reliability of the engagement of the contacts and the touch plate. After the circuit breaker is closed, the locking rod is synchronously extended, and the isolation knife cannot be manually opened. When the circuit breaker is opened, the isolation knife opens, and the locking device avoids opening impact on the insulating pull rod. The structure is simple, the disc-shaped locking plate is beautiful and has high strength performance, the matching precision is high, the locking is reliable, which greatly ensures the power safety of the distribution equipment and is suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the design of the locking plate of the isolating switch for the 10kV pole-mounted vacuum circuit breaker of the utility model;

[0015] Figure 2 This is a schematic diagram of the locking plate structure of the utility model;

[0016] Figure 3 This is a side view of the isolating switch supporting the circuit breaker of the utility model;

[0017] Figure 4 This is a schematic diagram of the locking shaft of the circuit breaker of the utility model. DETAILED DESCRIPTION

[0018] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] like Figure 1 As shown, the 10KV pole-mounted vacuum circuit breaker supporting isolating switch includes a high-strength post insulator 1, an insulating pull rod 2, a touch plate 3, an L-shaped terminal 4, a conductive clamp 5 and a base frame 6. The base frame 6 is fixedly provided on the outlet side of the pole-mounted vacuum circuit breaker box for carrying the isolating switch, and the isolating switch is connected to the circuit breaker outlet copper rod through the conductive clamp 5 to form a primary circuit part. The high-strength post insulator 1 is installed on the end surface of the base frame 6, and the upper end is connected to the L-shaped terminal 4 by bolts. The touch plate 3 is fixed to the conductive clamp 5 by bolts, realizing gapless meshing and rotation.

[0020] like Figure 1-3As shown, the locking device includes a locking shaft 8, an interlocking plate 9, a locking rod 10, a constant angle locking plate 11 and a locking pin 12. The constant angle locking plate 11 is fixedly arranged at the end of the isolating switch shaft 7 by an axle pin and rotates with the shaft 7. The constant angle locking plate 11 is arranged in a disc shape. A 65° locking rotation area 111, a locking rod stop area 112 and a locking rod free extension area 113 are respectively arranged on the outer edge of the constant angle locking plate 11. The locking pin 12 is fixedly arranged on the base frame 6 and corresponds to one side end point of the 65° locking rotation area 111 of the constant angle locking plate 11.

[0021] The locking shaft 8 is rotatable and penetrates the side wall of the circuit breaker housing 14. The end portion of the locking shaft 8 located on the inner side of the side wall of the circuit breaker housing 14 is fixedly connected to the spring shaft 15 inside the circuit breaker through a connecting plate. The end portion of the locking shaft 8 located on the outer side of the side wall of the circuit breaker housing 14 is fixedly connected to the interlocking plate 9 through a bolt. The other end of the interlocking plate 9 is fixedly connected to the locking rod 10. When the circuit breaker is closed, the driving rod 16 inside the circuit breaker drives the spring shaft 15 to move forward, and the spring shaft 15 drives the locking shaft 8 to rotate. The interlocking plate 9 rotates synchronously with the locking shaft 8. When the disconnector is closed, the rotating shaft 7 drives the constant angle locking plate 11 to rotate. After rotating 65°, it is restricted by the locking pin 12 to stop rotating. The disconnector reaches the closed position, and then the circuit breaker is closed. The locking rod 10 is driven by the interlocking plate 9 to extend from the locking rod stop area 112 to achieve the opening stop. When the circuit breaker is opened, the driving rod 16 drives the spring shaft 15 to move backward, and the spring shaft 15 drives the locking shaft 8 to rotate. The locking rod 10 is retracted in the locking rod stop area 112 driven by the interlocking plate 9, and then the disconnector can be opened. At this time, the locking rod 10 can be extended in the locking rod free extension area 113.

[0022] In particular, the locking pin 12 is welded and fixed on the base frame 6, which has a locking and limiting effect on the movement of the locking plate 11. The welding process requires inner side welding to ensure the locking accuracy.

[0023] As a preferred manner, in this embodiment, the 65° angle locking rotation area on the constant angle locking plate 11 is set to form an angle of 65° between the starting point, the end point of the area and the center of the constant angle locking plate 11.

[0024] As a preferred method, in this embodiment, the angle between the locking rod stop area 112 and the locking rod free extension area 113 on the constant angle locking plate 11 is set to 65°, and when the disconnector is closed, after the locking pin 12 is limited, the locking rod stop area 112 corresponds to the position of the locking rod 10, and when the disconnector is opened, after the locking pin 12 is limited, the locking rod free extension area 113 corresponds to the position of the locking rod 10.

[0025] The locking process of the opening and closing action of the utility model is as follows:

[0026] The disconnector handle 13 is manually operated to close the circuit breaker, which drives the operating shaft 7 to rotate, and the insulating pull rod 2 is driven by the crank arm connected to the shaft 7. The insulating pull rod 2 starts to drive the touch plate 3 to perform the closing movement. The locking plate 11 starts to rotate with the shaft 7 from the opening position. After rotating by 65°, it reaches the closing position due to the limiting effect of the locking pin 12, completing the closing operation. Then the circuit breaker is closed, and the internal driving rod 16 of the circuit breaker moves forward, synchronously driving the hanging spring shaft 15 to move forward, and the hanging spring shaft 15 drives the locking shaft 8 to rotate. The locking shaft 8 is connected to the interlocking plate 9 and rotates synchronously. The interlocking plate 9 drives the locking rod 10 to move. At this time, the locking rod 10 extends out of the locking rod stop area 112 to achieve the opening stop effect. When the circuit breaker is opened, the driving rod 16 inside the circuit breaker moves backward. Similarly, the interlocking plate 9 drives the locking rod 10 to move backward. The locking rod 10 retracts. When the disconnector is opened, the operating shaft 7 rotates to drive the insulating rod 2 to move. The insulating rod 2 begins to drive the touch plate 3 to perform the opening movement. After the locking plate 11 rotates 65° from the closing position with the shaft, the locking pin 12 plays a limiting role and completes the opening operation. At this time, the free extension area 113 of the locking rod corresponds to the position of the locking rod 10. When the circuit breaker is closed next time, the locking rod 10 can be extended in the free extension area 113 of the locking rod, thereby not affecting the closing and opening operations of the circuit breaker.

[0027] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A locking device for a 10KV pole-mounted vacuum circuit breaker supporting an isolating switch, wherein a base frame (6) is fixedly arranged on the outlet side of the pole-mounted vacuum circuit breaker box for carrying the isolating switch, and the isolating switch is connected to the circuit breaker outlet copper rod through a conductive clip (5) to form a primary circuit part, characterized in that: The locking device comprises a locking shaft (8), an interlocking plate (9), a locking rod (10), a constant angle locking plate (11) and a locking pin (12); the constant angle locking plate (11) is fixedly arranged at the end of the isolating switch rotating shaft (7) by an axle pin and rotates along with the rotating shaft (7); the constant angle locking plate (11) is arranged in a disc shape; and a 65° locking rotation area (111), a locking rod stop area (112) and a locking rod free extension area (113) are respectively arranged on the outer edge of the constant angle locking plate (11). The locking pin (12) is fixedly arranged on the base frame (6) and corresponds to one end point of the 65° locking rotation area (111) of the constant angle locking plate (11). The locking shaft (8) is rotatably arranged on the side wall of the circuit breaker housing (14). The end portion of the locking shaft (8) located on the inner side of the side wall of the circuit breaker housing (14) is fixedly connected to the hanging spring shaft (15) inside the circuit breaker via a connecting plate. The end portion of the locking shaft (8) located on the outer side of the side wall of the circuit breaker housing (14) is connected to the interlocking plate (9) via a bolt. The interlocking plate (9) is fixedly connected, and the other end of the interlocking plate (9) is fixedly connected to the locking rod (10). When the circuit breaker is closed, the driving rod (16) inside the circuit breaker drives the hanging spring shaft (15) to move forward, and the hanging spring shaft (15) drives the locking shaft (8) to rotate. The interlocking plate (9) rotates synchronously with the locking shaft (8). When the disconnector is closed, the rotating shaft (7) drives the constant angle locking plate (11) to rotate. After rotating at an angle of 65°, it is restricted by the locking pin (12) to stop rotating. The disconnector reaches the closed position, and then the circuit breaker is closed. The locking rod (10) is extended at the locking rod stop area (112) driven by the interlocking plate (9) to achieve the opening stop; when the circuit breaker is opened, the driving pull rod (16) drives the hanging spring shaft (15) to move backward, and the hanging spring shaft (15) drives the locking shaft (8) to rotate, and the locking rod (10) is retracted at the locking rod stop area (112) driven by the interlocking plate (9), and then the disconnector can be opened, and the locking rod (10) can be extended in the locking rod free extension area (113) at this time.

2. A locking device for a 10KV pole mounted vacuum circuit breaker supporting isolating switch according to claim 1, characterized in that: The 65° locking rotation area on the constant angle locking plate (11) is set such that an angle of 65° is formed between the starting point, the end point of the area and the center of the constant angle locking plate (11).

3. The locking device for the isolating switch of a 10KV pole mounted vacuum circuit breaker according to claim 1, characterized in that: When the isolating switch is closed, after the locking pin (12) is limited, the locking rod stop area (112) corresponds to the position of the locking rod (10); when the isolating switch is opened, after the locking pin (12) is limited, the locking rod free extension area (113) corresponds to the position of the locking rod (10).

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