Grounding circuit breaker

Abstract

The utility model discloses a grounded circuit breaker in the technical field of medium-voltage circuit breakers, which comprises a switch mechanism box, a mounting frame is welded on the left side of the switch mechanism box, an isolating switch rotating shaft is rotatably connected onto the mounting frame, a winder is fixedly connected onto the isolating switch rotating shaft, a steel wire rope is wound on the winder, and the steel wire rope is fixedly connected onto the isolating switch rotating shaft. And one end of the steel wire rope extends into the switch mechanism box and is fixedly connected with a second rotating shaft. The isolating switch rotating shaft is rotationally connected to the mounting frame, and the winder is fixedly connected to the rotating shaft, so that mechanical interlocking between the isolating switch and the internal grounding mechanism is realized. Specifically, a steel wire rope is wound on the winder, and one end of the steel wire rope extends into the switch mechanism box and is fixedly connected to the second rotating shaft. When the rotating shaft of the disconnecting switch is rotated, the rotating shaft not only controls the action of the disconnecting switch, but also drives the steel wire rope through the winder, thereby ensuring that the disconnecting switch must be closed before grounding operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of medium voltage circuit breaker, especially relates to a grounding circuit breaker. BACKGROUND

[0002] In power systems, circuit breakers are important components that protect circuits from overload and short-circuit damage. Their development history can be traced back to the early days of electrical engineering. With the significant increase in demand for electrical energy, the development of power distribution systems and the demand for more efficient and reliable circuit breaking technology have been promoted. Traditional circuit breakers mainly rely on mechanical switches and simple fuses to cut off the current, and when a fault occurs, the current flow is interrupted by fuse melting or contact separation. However, these traditional methods have the problems of slow response speed, inconvenient operation and high maintenance cost. Over time, different types of circuit breakers such as electromagnetic circuit breakers, thermal magnetic circuit breakers, and vacuum circuit breakers have emerged, which have made significant progress in improving circuit breaking efficiency, enhancing safety, and extending service life.

[0003] The design of modern grounding circuit breakers not only needs to consider basic opening and closing functions, but also needs to consider fast response capability, low maintenance requirement, high reliability and safety performance. However, some existing circuit breakers cannot ensure complete electrical isolation when performing grounding tasks, increasing potential safety risks. In particular, for those occasions that require frequent operation, such as branch lines in distribution networks or connection of temporary power equipment, existing solutions may not meet the requirements of fast and reliable grounding. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model provides a grounding circuit breaker, which comprises a switch mechanism box, a mounting frame is welded to the left side of the switch mechanism box, a disconnecting switch shaft is rotatably connected to the mounting frame, a wire winder is fixedly connected to the disconnecting switch shaft, a steel wire rope is wound on the wire winder, one end of the steel wire rope extends into the interior of the switch mechanism box and is fixedly connected with a second shaft, the second shaft is rotatably connected to a first vertical plate, a clockwork spring is connected to one end of the second shaft, a knife switch seat is fixedly connected to the second shaft, a metal guide plate is fixedly connected to the inner top of the switch mechanism box, and a knife switch piece is fixedly connected to one end of the metal guide plate.

[0005] Magnet blocks are fixedly connected to the two sides of the knife switch seat, and iron blocks are fixedly connected to the two sides of the knife switch piece.

[0006] A spring box is fixedly connected to the outer side of the clockwork spring, and a second vertical plate is fixedly connected to the lower part of the spring box.

[0007] One end of the metal guide piece penetrates the shell of the switch mechanism box, and the end of the metal guide piece is fixedly connected with a first terminal post, the first vertical plate is a metal plate, and the first vertical plate is connected with a second terminal post.

[0008] The upper portion of the switch mechanism box is provided with an arc extinguishing chamber, the arc extinguishing chamber is connected with a mutual inductor, and the mutual inductor is fixedly connected with a static contact.

[0009] The handle is fixedly connected to the disconnecting switch shaft, and the connecting post is installed on the disconnecting switch shaft, and the upper portion of the connecting post is provided with an isolation knife switch.

[0010] Compared with the prior art, the beneficial effects of the utility model are that the disconnecting switch and the internal grounding mechanism are mechanically interlocked by rotating the disconnecting switch shaft on the mounting frame and fixedly connecting the wire winder to the shaft.

[0011] When the disconnecting switch is correctly closed, the knife switch seat can approach the knife switch piece, at which time the magnet block attracts the iron block, and the knife switch seat is stably positioned at the grounding position. Such a design not only ensures the safety of the grounding operation, but also increases the stability of the electrical connection and reduces the risk of poor contact. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only the embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative labor.

[0013] Figure 1 It is the first view angle structure schematic diagram in the utility model.

[0014] Figure 2 It is the second view angle structure schematic diagram in the utility model.

[0015] Figure 3 It is the wire winder structure schematic diagram in the utility model.

[0016] Figure 4 It is the knife switch structure schematic diagram in the utility model.

[0017] In the figure: 1, switch mechanism box; 2, first terminal post; 3, handle; 4, arc extinguishing chamber; 5, mounting frame; 6, isolating knife switch; 7, mutual inductor; 8, static contact; 9, isolating switch shaft; 10, winder; 11, connecting post; 12, metal guide plate; 13, knife switch piece; 14, knife switch seat; 15, magnet block; 16, steel wire rope; 17, first vertical plate; 18, second terminal post; 19, second shaft; 20, clockwork spring; 21, second vertical plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0019] As Figures 1-4 shown in a kind of ground circuit breaker, including switch mechanism box 1, the left side of switch mechanism box 1 is welded with mounting frame 5, isolating switch shaft 9 is rotatably connected on mounting frame 5, winder 10 is fixedly connected on isolating switch shaft 9, steel wire rope 16 is wound on winder 10, one end of steel wire rope 16 extends into the interior of switch mechanism box 1 and is fixedly connected with second shaft 19, second shaft 19 is rotatably connected on first vertical plate 17, one end of second shaft 19 is connected with clockwork spring 20, knife switch seat 14 is fixedly connected on second shaft 19, the inner top of switch mechanism box 1 is fixedly connected with metal guide plate 12, one end of metal guide plate 12 is fixedly connected with knife switch piece 13.

[0020] The two sides of knife switch seat 14 are fixedly connected with magnet block 15, and the two sides of knife switch piece 13 are fixedly connected with iron block.

[0021] The outer side of clockwork spring 20 is fixedly connected with spring box, and the lower part of spring box is fixedly connected with second vertical plate 21.

[0022] One end of metal guide plate 12 penetrates the shell of switch mechanism box 1, and the end of metal guide plate 12 is fixedly connected with first terminal post 2, first vertical plate 17 is a metal plate, and second terminal post 18 is connected to first vertical plate 17.

[0023] The upper part of switch mechanism box 1 is provided with arc extinguishing chamber 4, mutual inductor 7 is connected to arc extinguishing chamber 4, and static contact 8 is fixedly connected to mutual inductor 7.

[0024] Handle 3 is fixedly connected to isolating switch shaft 9, connecting post 11 is installed on isolating switch shaft 9, and isolating knife switch 6 is arranged on the upper part of connecting post 11.

[0025] Working principle: When the operation of the circuit breaker needs to be performed, the operator will grab the handle 3 installed on the disconnecting switch shaft 9 through the tool, and rotate it clockwise or counterclockwise as needed. This action not only controls the action of the isolation knife switch 6, but also simultaneously starts a series of mechanical linkage processes.

[0026] With the rotation of the disconnecting switch shaft 9, it directly drives the winder 10 fixed on it. The winder 10 is wound with a steel wire rope 16, one end of which extends into the inside of the switch mechanism box 1 and is connected with the second shaft 19. Therefore, the rotation of the winder 10 will cause the tightening or loosening of the steel wire rope 16, thereby affecting the position change of the internal components.

[0027] The clock spring 20 is connected to one end of the second shaft 19 and is designed to provide an automatic reset force. When the disconnecting switch is closed, that is, the disconnecting switch shaft 9 rotates to its terminal position, the steel wire rope 16 will be tightened, so that the clock spring 20 is further compressed and stores energy. Once the disconnecting switch shaft 9 starts to rotate in the opposite direction, the clock spring 20 releases its stored energy, prompting the steel wire rope 16 to reset and re-wind on the winder 10. This design ensures that the system can automatically return to the initial state even without external power.

[0028] In order to ensure that the knife switch seat 14 will not accidentally trip when it contacts the metal conductor piece 12 due to excessive force from the clock spring 20, the magnet block 15 is installed on both sides of the knife switch seat 14, and the iron block is installed on both sides of the corresponding knife switch piece 13. When the knife switch seat 14 approaches the knife switch piece 13, the attractive force between the magnet block 15 and the iron block increases, effectively offsetting part of the tension from the clock spring 20, ensuring that the knife switch seat 14 can be stably maintained in the contact position.

[0029] The utility model is particularly designed with a safety interlocking mechanism to ensure that grounding operation can only be performed after the disconnecting switch is completely disconnected. Specifically, as long as the disconnecting switch is not completely closed, that is, the isolation knife switch 6 does not reach the predetermined position, the winder 10 will not allow the steel wire rope 16 to release enough length to move the knife switch seat 14 to the position of contacting the metal conductor piece 12. This ensures that in any case, the disconnecting switch must be closed before the grounding operation is completed, thereby effectively avoiding the safety hazards caused by misoperation.

[0030] In addition, the upper part of the switch mechanism box 1 is provided with an arc extinguishing chamber 4 for quickly extinguishing the arc to protect the circuit from damage. The mutual inductor 7 is used to monitor the current condition and can trigger a protection action such as automatically disconnecting the circuit or issuing an alarm signal when an abnormality is detected, further enhancing the safety of the system.

[0031] In summary, in the use process, the utility model discloses a series of carefully designed mechanical linkage and safety interlocking mechanism, ensure the orderly progress of disconnecting switch and grounding operation, improve the safety and reliability of power system operation.

[0032] The above description of the embodiments is only used to help understand the method and the core idea of the utility model. It should be pointed out that for ordinary skilled persons in the art, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. A grounded circuit breaker comprising a switching mechanism tank (1), characterized in that: The left side of the switch mechanism box (1) is welded with a mounting frame (5), the mounting frame (5) is rotationally connected with an isolating switch shaft (9), the isolating switch shaft (9) is fixedly connected with a wire winder (10), the wire winder (10) is wound with a steel wire rope (16), one end of the steel wire rope (16) extends into the interior of the switch mechanism box (1) and is fixedly connected with a second shaft (19), the second shaft (19) is rotationally connected with a first vertical plate (17), one end of the second shaft (19) is connected with a clockwork spring (20), the second shaft (19) is fixedly connected with a knife switch seat (14), the inner top of the switch mechanism box (1) is fixedly connected with a metal guide plate (12), one end of the metal guide plate (12) is fixedly connected with a knife switch piece (13).

2. A grounded circuit breaker according to claim 1, wherein: The both sides of the knife switch seat (14) are fixedly connected with magnet blocks (15), the both sides of the knife switch piece (13) are fixedly connected with iron blocks.

3. The grounded circuit breaker of claim 1, wherein: The outer side of the clockwork spring (20) is fixedly connected with a spring box, the lower part of the spring box is fixedly connected with a second vertical plate (21).

4. The grounded circuit breaker of claim 1, wherein: One end of the metal guide plate (12) penetrates through the shell of the switch mechanism box (1), the end of the metal guide plate (12) is fixedly connected with a first terminal post (2), the first vertical plate (17) is a metal plate, the first vertical plate (17) is connected with a second terminal post (18).

5. The grounded circuit breaker of claim 1, wherein: The upper part of the switch mechanism box (1) is provided with an arc extinguishing chamber (4), the arc extinguishing chamber (4) is connected with a mutual inductor (7), the mutual inductor (7) is fixedly connected with a static contact (8).

6. The grounded circuit breaker of claim 1, wherein: The isolating switch shaft (9) is fixedly connected with a handle (3), the isolating switch shaft (9) is provided with a connecting post (11), the upper part of the connecting post (11) is provided with an isolating knife switch (6).

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