Arc extinguish chamber for circuit breaker

Abstract

The arc extinguish chamber comprises two fixing plates and a plurality of arc extinguish grid sheets arranged between the two fixing plates in parallel, each fixing plate comprises a side plate and a fixing block, the inner wall of each side plate is fixedly connected with the corresponding fixing block, the top surface of each fixing block is provided with an insertion cavity, and the insertion cavities are communicated with the arc extinguish grid sheets. A plurality of limiting grooves are formed in the surfaces of the tops of the side plates, limiting blocks are fixedly connected to the positions, opposite to the limiting grooves, of the two sides of the surface of each arc-extinguishing grid piece, the limiting blocks are movably connected into the limiting grooves, connecting blocks are fixedly connected to the lower portions of the two sides of the surface of each arc-extinguishing grid piece, and the connecting blocks are movably connected into the plugging cavities. According to the utility model, the arc extinguishing grid sheets and the fixed plate are clamped and connected together through the connecting blocks and the notches, and the limiting blocks are matched with the limiting grooves, so that compared with the prior art, the impact resistance effect of the arc extinguishing grid sheets can be greatly enhanced, and the working stability of the circuit breaker can also be enhanced when the circuit breaker is used.

Description

Technical Field

[0001] The utility model relates to the technical field of arc extinguishing chambers, in particular to an arc extinguishing chamber for a circuit breaker. Background Technique

[0002] An arc extinguishing chamber is usually equipped in a circuit breaker to extinguish the arc generated when the circuit is disconnected at the switch. The currently widely used arc extinguishing method is the arc blowing method, which uses external forces such as air flow, oil flow or electromagnetic force to blow the arc, so that the arc is elongated, and at the same time the arc is cooled, the electric field strength in the arc is reduced, the recombination and diffusion are enhanced, and the arc extinguishing is accelerated.

[0003] However, in the existing arc extinguishing chamber, a plurality of clamping positions are opened on two arc extinguishing grid plate mounting plates to be clamped with the arc extinguishing grids. Such a setting makes the anti-impact effect inside the arc extinguishing chamber poor, seriously affecting the service life of the arc extinguishing chamber. Summary of the Invention

[0004] The purpose of the utility model is to provide an arc extinguishing chamber for a circuit breaker to solve the problem mentioned in the above background technique that in the existing arc extinguishing chamber, a plurality of clamping positions are opened on two arc extinguishing grid plate mounting plates to be clamped with the arc extinguishing grids. Such a setting makes the anti-impact effect inside the arc extinguishing chamber poor, seriously affecting the service life of the arc extinguishing chamber.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: An arc extinguishing chamber for a circuit breaker includes two fixing plates and a plurality of arc extinguishing grids arranged in parallel between the two fixing plates. The fixing plate includes a side plate and a fixing block. The inner wall of the side plate is fixedly connected with the fixing block. A socket cavity is opened on the top surface of the fixing block. A plurality of limiting grooves are evenly opened on the top surface of the side plate. Limiting blocks are fixedly connected to the two sides of the surface of the arc extinguishing grid at positions opposite to the limiting grooves, and the limiting blocks are movably connected in the limiting grooves. Connecting blocks are fixedly connected to the lower sides of the two sides of the surface of the arc extinguishing grid, and the connecting blocks are movably connected in the socket cavity.

[0006] Preferably, a notch is opened at one end of the bottom of the side plate at a position opposite to the socket cavity, and the notch is clamped with the connecting block.

[0007] Preferably, an arc starting notch is opened on the bottom surface of the arc extinguishing grid. The arc starting notch includes a first part and a second part that are connected to each other. The first part has a structure that expands vertically along the direction of the second part. The center lines of the first part and the second part both overlap with the center line of the arc extinguishing grid.

[0008] Preferably, the second part is designed with a V-shaped structure.

[0009] Preferably, an exhaust channel is formed between the surfaces of the two arc extinguishing grids.

[0010] Beneficial effects

[0011] Compared with the existing technologies, the beneficial effects of the present utility model are as follows:

[0012] The arc extinguishing grid plates and the fixing plate of the present utility model are tightly connected together through connecting blocks and notches, and the cooperation between the limiting blocks and the limiting grooves can greatly enhance the impact resistance of the arc extinguishing grid plates compared with the existing technologies, and can also enhance the working stability of the circuit breaker during use; at the same time, the arc extinguishing grid plates are directly inserted and connected to the insertion cavity, making the assembly of the arc extinguishing grid plates more convenient and fast. Description of the drawings

[0013] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 is a schematic diagram of the structure of the arc extinguishing grid plates of the present utility model;

[0015] Figure 3 is a schematic diagram of the structure of the fixing plate of the present utility model.

[0016] 1. Fixing plate; 2. Arc extinguishing grid plates; 3. Exhaust passage; 11. Side plate; 12. Fixed block; 13. Insertion cavity;

[0017] 14. Limiting groove; 15. Notch; 21. Limiting block; 22. Connecting block; 23. Arc ignition notch; 24. First part;

[0018] 25. Second part. Detailed implementation manners

[0019] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0021] Such as Figures 1-3It is a schematic structural diagram of an arc extinguishing chamber for a circuit breaker according to a preferred embodiment of the present utility model. In this embodiment, an arc extinguishing chamber for a circuit breaker includes two fixing plates 1 and a plurality of arc extinguishing grid plates 2 arranged in parallel between the two fixing plates 1. The fixing plate 1 includes a side plate 11 and a fixing block 12. A fixing block 12 is fixedly connected to the inner wall of the side plate 11. An insertion cavity 13 is formed on the top surface of the fixing block 12. A plurality of limiting grooves 14 are formed on the top surface of the side plate 11. Limiting blocks 21 are fixedly connected to both sides of the surface of the arc extinguishing grid plate 2 at positions opposite to the limiting grooves 14, and the limiting blocks 21 are movably connected to the limiting grooves 14. Connecting blocks 22 are fixedly connected to both sides below the surface of the arc extinguishing grid plate 2, and the connecting blocks 22 are movably connected to the insertion cavity 13. Through the above structural arrangement, the arc extinguishing grid plate 2 and the fixing plate 1 are tightly connected together through the connecting block 22 and the notch 15, and the cooperation between the limiting block 21 and the limiting groove 14 can greatly enhance the anti-impact effect of the arc extinguishing grid plate 2 compared with the prior art, and also enhance the working stability of the circuit breaker during use.

[0022] In this embodiment, a notch 15 is formed at one end of the bottom of the side plate 11 at a position opposite to the insertion cavity 13. The notch 15 and the connecting block 22 are mutually clamped to realize the fixing function between the arc extinguishing grid plate 2 and the fixing plate 1.

[0023] In this embodiment, an arc guiding notch 23 is formed on the bottom surface of the arc extinguishing grid plate 2. The arc guiding notch 23 includes a first part 24 and a second part 25 that are mutually connected. The structure in which the first part 24 expands vertically along the direction of the second part 25 can improve the suction force of the arc extinguishing grid plate 2 on the arc, reduce the resistance when the arc enters the arc extinguishing chamber, so that the arc absorbing sheet provided in the prior art can be omitted, and the production process and production cost of the arc extinguishing chamber can be reduced; the center lines of the first part 24 and the second part 25 both overlap with the center line of the arc extinguishing grid plate 2. This structural design makes the arc extinguishing grid plate 2 a center line symmetric structure, so that the assembly of the entire arc extinguishing chamber is more convenient and fast.

[0024] In this embodiment, the second part 25 is designed in a V-shaped structure. The V-shaped structure can play a role in stretching the arc to improve the arc extinguishing efficiency of the arc extinguishing chamber.

[0025] In this embodiment, an exhaust channel 3 is formed between the surfaces of the two arc extinguishing grid plates 2. Such a setting makes the arc in the arc extinguishing chamber easier to eject, thereby improving the arc extinguishing efficiency of the arc extinguishing chamber and prolonging the service life of the entire circuit breaker.

[0026] The above content further elaborates on the present utility model in conjunction with specific embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as falling within the protection scope determined by the claims submitted for the present utility model.

Claims

1. An arc extinguishing chamber for a circuit breaker, comprising two fixed plates (1) and a plurality of arc extinguishing grids (2) arranged in parallel between the two fixed plates (1), characterized in that: The fixing plate (1) comprises a side plate (11) and a fixing block (12); the fixing block (12) is fixedly connected to the inner wall of the side plate (11); a plug-in cavity (13) is formed at the top surface of the fixing block (12); a plurality of limit grooves (14) are provided on the top surface of the side plate (11); limit blocks (21) are fixedly connected to the two sides of the surface of the arc extinguishing grid (2) at relative positions to the limit grooves (14); the limit blocks (21) are movably connected to the limit grooves (14); connection blocks (22) are fixedly connected to the lower sides of the surface of the arc extinguishing grid (2); and the connection blocks (22) are movably connected to the plug-in cavity (13).

2. The arc extinguishing chamber for a circuit breaker according to claim 1, characterized in that: A notch (15) is provided at one end of the bottom of the side plate (11) at a position relative to the insertion cavity (13), and the notch (15) and the connecting block (22) are mutually engaged.

3. The arc extinguishing chamber for a circuit breaker according to claim 1, characterized in that: The bottom surface of the arc extinguishing grid (2) is provided with an arc striking notch (23), the arc striking notch (23) comprising a first part (24) and a second part (25) connected to each other, the first part (24) being a structure vertically expanding in the direction of the second part (25), the center line of the first part (24) and the center line of the second part (25) both overlapping with the center line of the arc extinguishing grid (2).

4. The arc extinguishing chamber for a circuit breaker according to claim 3, characterized in that: The second part (25) is designed in a V-shaped structure.

5. The arc extinguishing chamber for a circuit breaker according to claim 3, characterized in that: An exhaust channel (3) is formed between the surfaces of the two arc-extinguishing grids (2).

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