Arc extinguishing system of circuit breaker

Abstract

The utility model relates to an arc extinguishing system of a circuit breaker, which comprises an arc extinguishing chamber arranged on a static contact and an arc dividing assembly arranged in a shell corresponding to an exhaust port of the arc extinguishing chamber, and the arc dividing assembly comprises an arc dividing piece, a first flash barrier and a second flash barrier, the arc dividing piece, the first flash barrier and the second flash barrier are sequentially arranged in an exhaust channel of the shell from inside to outside, at least one arc dividing protruding strip is arranged on the side, facing an arc extinguishing grid piece of the arc extinguishing chamber, of the arc dividing piece, and a plurality of cavities are formed between the arc dividing protruding strip and the arc extinguishing chamber and between the arc dividing protruding strip and the shell. And exhaust holes communicated with the plurality of cavities are formed in the arc dividing piece. The arc extinguishing device has the advantages of being simple in structure, stable and reliable in performance, good in arc extinguishing effect and capable of effectively improving the breaking capacity of the circuit breaker.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, concretely relates to a circuit breaker's arc extinguishing system. BACKGROUND

[0002] Circuit breaker refers to the switch device that can close, carry and open the current under normal circuit condition and can close, carry and open the current under abnormal circuit condition within the stipulated time. Circuit breaker has overload, short circuit and under voltage protection function, can protect the line and power supply equipment from being damaged, and can also provide protection for the fire hazard caused by long-term existing ground fault that overcurrent protection cannot detect. The molded case circuit breaker includes a shell, an operating mechanism, a contact system and an arc extinguishing system. The structure design of the arc extinguishing system of the existing circuit breaker is unreasonable. After the arc leaves the arc extinguishing chamber, the arc is easy to be reignited again due to the large space at the front end of the arc extinguishing chamber. Especially when breaking the direct current high voltage, the arc is easy to be reignited again, the arc burning time is long, the arc extinguishing chamber is easy to be burned out, and the arc extinguishing effect is not ideal, thereby resulting in weak limit breaking and operating breaking capacity of the circuit breaker. SUMMARY

[0003] The utility model aims at overcoming the defects of prior art, and provides an arc extinguishing system with simple structure, stable and reliable performance, good arc extinguishing effect and improved breaking capacity of circuit breaker.

[0004] To achieve the above-mentioned purpose, the utility model adopts an arc extinguishing system of circuit breaker, which comprises an arc extinguishing chamber arranged on the static contact and an arc splitting assembly arranged in the shell at the exhaust port corresponding to the arc extinguishing chamber. The arc splitting assembly comprises an arc splitting piece, a first arc separating plate and a second arc separating plate. The arc splitting piece, the first arc separating plate and the second arc separating plate are sequentially arranged in the exhaust passage of the shell from inside to outside. At least one arc splitting protrusion is arranged on one side of the arc splitting piece facing the arc extinguishing grid of the arc extinguishing chamber. A plurality of cavities are formed between the arc splitting protrusion and the arc extinguishing chamber and the shell. Exhaust holes are arranged on the arc splitting piece and connected with the plurality of cavities.

[0005] The arc splitting assembly is arranged in the shell and matched with the arc extinguishing chamber. After the arc leaves the arc extinguishing chamber, the arc splitting piece of the arc splitting assembly splits the arc into multiple segments, cuts the arc, lengthens the arc and accelerates the formation of voltage drop, so that the arc is quickly extinguished to prevent the arc from being reignited again in the arc extinguishing chamber, thereby achieving the purpose of shortening the arc burning time and arc burning distance. Therefore, the arc extinguishing system of the circuit breaker has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect and improved breaking capacity of circuit breaker.

[0006] In particular, the arc splitting piece is made of high-temperature-resistant and flame-retardant insulating material. The arc splitting piece can lengthen and cut the arc, thereby improving the arc extinguishing performance of the arc extinguishing system.

[0007] Particularly, the convex arc breaking piece is provided with reinforcing ribs on both sides.

[0008] Particularly, the first arc breaking plate is provided with a plurality of air holes connected with the exhaust holes.

[0009] Particularly, the second arc breaking plate is made of elastic and flame-retardant insulating material.

[0010] Particularly, the second arc breaking plate is provided with a clamping part connected with the shell at one end and an elastic springing part at the other end. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a sectional view of the circuit breaker of the embodiment of the present application.

[0012] Figure 2 It is a structure diagram of the arc breaking piece of the embodiment of the present application.

[0013] Figure 3 It is a structure diagram of the first arc breaking plate of the embodiment of the present application.

[0014] Figure 4 It is a structure diagram of the second arc breaking plate of the embodiment of the present application. DETAILED DESCRIPTION

[0015] As Figures 1-4As shown, the arc splitting assembly 20 is arranged in the exhaust passage 121 of the shell 12 from inside to outside and sequentially comprises an arc splitting piece 21, a first arc separation plate 22 and a second arc separation plate 23. The arc splitting piece 21 is provided with at least one arc splitting protruding strip 211 on the side facing the arc extinguishing grid 112 of the arc extinguishing chamber 11. The arc splitting protruding strip 211 and the arc extinguishing chamber 11 and the shell 12 form a plurality of chambers 200, and the arc splitting piece 21 is provided with exhaust holes 212 in communication with the plurality of chambers 200. The arc splitting piece 21 is made of high-temperature-resistant and flame-retardant insulating material. The arc splitting piece can lengthen and cut the electric arc, thereby improving the arc extinguishing performance of the arc extinguishing system. The arc splitting protruding strip 211 is provided with reinforcing ribs 2111 on both sides. The reinforcing ribs can enhance the overall strength of the arc splitting piece, thereby ensuring that the arc splitting piece does not deform due to high temperature and improving the working reliability of the arc extinguishing system.

[0016] As shown, Figure 3 The first arc separation plate 22 is provided with a plurality of air holes 221 in communication with the exhaust holes 212. The plurality of air holes of the first arc separation plate can discharge the electric arc, thereby improving the arc extinguishing performance of the arc extinguishing system.

[0017] As shown, Figure 4 The second arc separation plate 23 is made of elastic and flame-retardant insulating material. The second arc separation plate made of elastic and flame-retardant material can isolate the electric arc, thereby improving the working reliability of the arc extinguishing system. The second arc separation plate 23 has a clamping portion 231 clamped in the shell 12 at one end, and has an elastic springing portion 232 at the other end. The elastic springing portion is arranged on the second arc separation plate, and the air pressure inside the arc extinguishing chamber can spring the elastic springing portion of the second arc separation plate, quickly blow out the electric arc, and improve the arc extinguishing performance of the arc extinguishing system.

[0018] The arc splitting assembly is arranged in the shell in cooperation with the arc extinguishing chamber. After the electric arc exits the arc extinguishing chamber, the arc splitting piece of the arc splitting assembly splits the electric arc into multiple segments, cuts the electric arc, lengthens the electric arc, accelerates the voltage drop, quickly extinguishes the electric arc, prevents the electric arc from re-igniting in the arc extinguishing chamber, and achieves the purpose of shortening the arc time and arc distance. Therefore, the arc extinguishing system of the circuit breaker has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect, and effectively improving the breaking capacity of the circuit breaker.

Claims

1. An arc quenching system for a circuit breaker, characterized by: The arc splitting assembly is arranged in the exhaust channel of the shell and comprises an arc splitting piece, a first arc separating plate and a second arc separating plate arranged in the exhaust channel of the shell in sequence from inside to outside.

2. The arc chute system of claim 1, wherein: The arc splitting piece is made of high-temperature-resistant and flame-retardant insulating material.

3. The arc chute system of claim 1 or 2, wherein: The arc splitting piece is provided with at least one arc splitting protrusion on the side of the arc splitting piece facing the arc splitting fins of the arc chamber.

4. The arc chute system of claim 1 or 2, wherein: The first arc separating plate is provided with a plurality of air holes communicating with the exhaust holes.

5. The arc chute system of claim 1 or 2, wherein: The second arc separating plate is made of elastic and flame-retardant insulating material.

6. The arc chute system of claim 5, wherein: One end of the second arc separating plate is provided with a clamping portion connected in the shell, and the other end of the second arc separating plate is provided with an elastic springing portion.

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