CN-224204082-U - Arc extinguishing system of universal circuit breaker

CN224204082UCN 224204082 UCN224204082 UCN 224204082UCN-224204082-U

Abstract

The utility model belongs to the field of circuit breakers, and particularly relates to an arc extinguishing system of a universal circuit breaker, which comprises a shell, an arc extinguishing chamber, an anti-dissociation component and an arc striking sheet, wherein the arc extinguishing chamber comprises two arc isolating plates and a plurality of arc extinguishing grid sheets, an arc extinguishing channel is formed between the arc extinguishing grid sheets, two gas generating plates are arranged on the inner walls of the two arc isolating plates corresponding to the air inlets of the arc extinguishing chamber, a gas generating channel communicated with the arc extinguishing channel is formed between the two gas generating plates, a lower gas blocking piece separated between a conductive copper bar of a movable contact and a fixed contact is arranged in a containing cavity of the shell, an upper gas blocking piece separated between the lower gas blocking piece and the conductive copper bar is arranged on the movable contact in a linkage manner, and the two gas generating plates generate gas under the action of high temperature of an arc, so that the arc extinguishing chamber is pressurized to form a gas blowing effect, the arc can enter the arc extinguishing chamber quickly, the upper gas blocking piece and the lower gas blocking piece can block the gas from overflowing to the rear of the movable contact, and the internal element of the arc breaker can be effectively avoided.

Inventors

WANG XIAODENG
WANG ZHIYONG
FU XINYUAN
HUANG YUAN

Assignees

华通机电股份有限公司

Dates

Publication Date: 20260505
Application Date: 20250516
Priority Date: 20240719

Claims (10)

1. The arc extinguishing system of the universal circuit breaker is characterized by comprising a shell, an arc extinguishing chamber arranged in a containing cavity of the shell, an arc extinguishing component arranged on an air outlet of the arc extinguishing chamber, and an arc striking piece arranged on the arc extinguishing chamber corresponding to a moving contact, wherein the arc extinguishing chamber comprises two arc isolating plates and a plurality of arc extinguishing grid pieces arranged between the two arc isolating plates, an arc extinguishing channel is formed between the arc extinguishing grid pieces, two gas generating plates are arranged on the inner walls of the two arc isolating plates corresponding to an air inlet of the arc extinguishing chamber, a gas generating channel communicated with the arc extinguishing channel is formed between the two gas generating plates, a lower gas blocking piece which is separated between a conductive copper bar of the moving contact and a fixed contact is arranged in the containing cavity of the shell, an upper gas blocking piece which is separated between the lower gas blocking piece and the conductive copper bar is arranged on the moving contact in a linkage mode, and an arc extinguishing cavity communicated with the gas generating channel is formed between the lower gas blocking piece, the upper gas blocking piece and the arc extinguishing chamber.
2. The arc extinguishing system of the universal circuit breaker according to claim 1, wherein the arc extinguishing assembly comprises a fixing seat, a supporting plate, an arc extinguishing screen plate and a cover plate, wherein the fixing seat and the supporting plate are arranged on the two arc extinguishing plates corresponding to the air outlets of the arc extinguishing chambers, through holes communicated with the arc extinguishing channels are formed in the fixing seat, the supporting plate and the arc extinguishing screen plate are sequentially overlapped and arranged in the through holes, the cover plate is arranged on the fixing seat and covers the arc extinguishing screen plate, a plurality of air holes communicated with the arc extinguishing channels are formed in the supporting plate, a plurality of meshes communicated with the air holes are distributed on the arc extinguishing screen plate, and a plurality of exhaust holes communicated with the meshes are formed in the cover plate.
3. The arc extinguishing system of the universal circuit breaker according to claim 2, wherein the shell is provided with a cover body covering the cover plate, the cover body is internally provided with a ventilation cavity communicated with the exhaust hole, and two sides of the cover body corresponding to the exhaust hole of the cover plate are respectively provided with a plurality of ventilation holes.
4. The arc extinguishing system of the universal circuit breaker according to claim 2 or 3, wherein one end of the arc striking piece is provided with an arc striking part which is connected to the fixed seat and is covered on the arc extinguishing grid pieces, the other end of the arc striking piece is provided with a bending part which extends towards the air inlet direction of the arc extinguishing chamber, and the tail part of the bending part is provided with an arc striking angle close to the moving contact.
5. The arc extinguishing system of the universal circuit breaker according to claim 3, wherein a clamping groove is formed between the arc striking angle and the bending part, and a supporting stop block clamped in the clamping groove is arranged between the two arc baffles.
6. The arc extinguishing system of the universal circuit breaker according to claim 1, wherein the fixed contact is provided with an arc striking plate, one end of the arc striking plate is fixed in the shell, and the other end of the arc striking plate is provided with an arc striking straight plate part penetrating through the gas generating channel and extending below the arc extinguishing grid sheets.
7. The arc extinguishing system of the universal circuit breaker according to claim 6, wherein the arc striking straight plate part is provided with a strip-shaped hole, and the strip-shaped hole extends from the static contact to the arc extinguishing grid plate direction.
8. The arc extinguishing system of the universal circuit breaker according to claim 1, wherein the lower gas baffle member is provided with a guide cambered surface matched with the moving track of the moving contact, the upper gas baffle member is provided with a baffle plate in sliding fit with the guide cambered surface, and the baffle plate of the upper gas baffle member moves along with the moving contact and slides back and forth on the guide cambered surface.
9. The arc extinguishing system of universal circuit breaker as recited in claim 8 wherein two shielding plates are arranged on two sides of the upper gas baffle member and extend on two sides of the movable contact, and a shielding space is formed between the two shielding plates and the separating plate.
10. The arc extinguishing system of the universal circuit breaker according to claim 1, wherein a plurality of clamping columns are respectively arranged on the two gas generating plates, a plurality of clamping holes matched with the clamping columns are respectively arranged on the two arc isolating plates, and the clamping columns of the two gas generating plates are respectively clamped in the clamping holes of the two arc isolating plates.

Description

Arc extinguishing system of universal circuit breaker Technical Field The utility model belongs to the technical field of circuit breakers, and particularly relates to an arc extinguishing system of a universal circuit breaker. Background The universal breaker is also called a frame type breaker, and is a mechanical switching device which can be used for switching on, carrying and breaking current under normal circuit conditions and also can be used for switching on, carrying for a certain time and breaking current under specified abnormal circuit conditions. The universal circuit breaker is used for distributing electric energy and protecting overload, undervoltage, short circuit and the like of a circuit and power supply equipment. The current universal circuit breaker's arc extinguishing system comprises explosion chamber, striking piece, and the explosion chamber comprises two flash barrier and a plurality of arc extinguishing bars piece, because the circuit breaker divide-shut brake in-process can produce a large amount of electric arcs, and the speed of electric arc is very fast, leads to this arc extinguishing system's arc extinguishing bars piece to be unable to extinguish the electric arc fast, leads to the violent problem of flashover, and partial electric arc can overflow from the arc extinguishing system for inside continuing to move at the circuit breaker for the inside abnormal temperature of circuit breaker rises, causes the problem of breaking down the interior component of circuit breaker even. Disclosure of Invention The utility model aims to overcome the defects and the shortcomings of the prior art, and provides an arc extinguishing system of a universal circuit breaker, which can effectively solve the problems of low arc extinguishing speed and severe arc flashover. . The technical scheme includes that the arc extinguishing system of the universal circuit breaker comprises a shell, an arc extinguishing chamber arranged in a containing cavity of the shell, an arc extinguishing component arranged on an air outlet of the arc extinguishing chamber, and an arc striking piece arranged on the arc extinguishing chamber corresponding to a moving contact, wherein the arc extinguishing chamber comprises two arc isolating plates and a plurality of arc extinguishing grid pieces arranged between the two arc isolating plates, arc extinguishing channels are formed between the arc extinguishing grid pieces, two gas generating plates are arranged on the inner walls of the two arc isolating plates corresponding to an air inlet of the arc extinguishing chamber, a gas generating channel communicated with the arc extinguishing channels is formed between the two gas generating plates, a lower gas blocking piece separated between a conductive copper bar of the moving contact and a fixed contact is arranged in the containing cavity of the shell, an upper gas blocking piece separated between the lower gas blocking piece and the conductive copper bar is arranged on the moving contact in a linkage mode, and a cavity communicated with the gas generating channel is formed between the lower gas blocking piece, the upper gas blocking piece and the arc extinguishing chamber. In some embodiments, the free subassembly that disappears include fixing base and backup pad and the free otter board that disappears that corresponds explosion chamber gas outlet department and set up on two flash barrier and apron, the fixing base on be provided with the through-hole that is linked together with the arc extinguishing passageway, backup pad, free otter board that disappears stack in proper order set up in the through-hole, the apron set up on the fixing base and the shroud on free otter board that disappears, the backup pad be provided with a plurality of gas pockets that are linked together with the arc extinguishing passageway, free otter board that disappears on distribute and be linked together with a plurality of gas pockets a plurality of mesh, the apron on be provided with a plurality of exhaust holes that are linked together with a plurality of mesh. In some embodiments, the shell is provided with a cover body covering the cover plate, the cover body is internally provided with a ventilation cavity communicated with the exhaust hole, and two sides of the cover body corresponding to the exhaust hole of the cover plate are respectively provided with a plurality of ventilation holes. In some embodiments, one end of the arc striking piece is provided with an arc striking part which is connected to the fixing seat and is covered on the arc extinguishing grid pieces, the other end of the arc striking piece is provided with a bending part which extends towards the direction of the air inlet of the arc extinguishing chamber, and the tail part of the bending part is provided with an arc striking angle close to the moving contact. In some embodiments, a clamping groove is formed between the arc striking angle and the bending part, a