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CN-224217457-U - Arc extinguishing system of circuit breaker

CN224217457UCN 224217457 UCN224217457 UCN 224217457UCN-224217457-U

Abstract

The arc extinguishing system of the circuit breaker comprises an arc extinguishing chamber and a static contact assembly arranged at the lower end of the arc extinguishing chamber, wherein the static contact assembly comprises a static contact, the static contact is formed by a front end U-shaped part 210 and a tail connecting part, a static contact is arranged on the upper end face of the front end U-shaped part, an arc striking angle is arranged at the tail connecting part, and the arc striking angle is arranged towards the static contact. Through technical schemes such as increasing magnetic field striking, arc extinguishing bars equidistance striking and air blowing striking, promoted electric arc fast moving to extinguishing device, promoted the arc extinguishing effect.

Inventors

  • YUAN FUSHENG
  • GU XIANG
  • HAN RUILIANG

Assignees

  • 环宇高科有限公司

Dates

Publication Date
20260508
Application Date
20250522

Claims (10)

  1. 1. An arc extinguishing system of a circuit breaker is characterized in that the arc extinguishing system comprises: an arc extinguishing chamber (100); The static contact assembly (200) is arranged at the lower end of the arc extinguishing chamber (100), the static contact assembly (200) comprises a static contact, the static contact is formed by a front end U-shaped part (210) and a tail connecting part (220), the upper end face of the front end U-shaped part (210) is provided with a static contact (230), an arc striking angle (400) is arranged at the tail connecting part (220), and the arc striking angle (400) is arranged towards the static contact (230).
  2. 2. The arc extinguishing system of the circuit breaker according to claim 1, wherein the upper end of the arc striking angle (400) is flush with the welding surface of the stationary contact (230).
  3. 3. An arc extinguishing system of a circuit breaker according to claim 1 or 2, characterized in that the distance between the front end of the striking angle (400) and the stationary contact (230) is 1-2mm.
  4. 4. The arc extinguishing system of the circuit breaker according to claim 3, wherein one side of the arc striking angle (400) is riveted with the tail connection part (220) through an L-shaped connection piece (410).
  5. 5. The arc extinguishing system of the circuit breaker according to claim 1, wherein the front end U-shaped part (210) is provided with a magnetism increasing block (300) in the middle.
  6. 6. The arc extinguishing system of the circuit breaker according to claim 5, wherein a positioning groove (240) for fixing the magnetism increasing block (300) is arranged on the lower end face of the front end U-shaped part (210).
  7. 7. The arc extinguishing system of a circuit breaker according to claim 1, wherein the arc extinguishing chamber (100) comprises a pair of side plates (110) which are oppositely arranged, a plurality of arc extinguishing grid plates which are arranged between the two side plates (110) at intervals along the up-down direction and an arc extinguishing chamber (150) which is arranged at the front end of the arc extinguishing chamber, the arc extinguishing chamber (150) comprises two arc extinguishing side plates (151) which are oppositely arranged, a static contact protection cover (152) which is arranged at the bottom of the arc extinguishing side plates (151) and an arc extinguishing top plate (153) which is arranged at the top of the two arc extinguishing side plates (151), and the arc extinguishing top plate (153) seals the upper end opening of the arc extinguishing chamber (100).
  8. 8. The arc extinguishing system of the circuit breaker according to claim 7, wherein the bottom of the arc extinguishing side plate (151) is provided with a slot for placing a magnetic increasing plate (600).
  9. 9. The arc extinguishing system of a circuit breaker according to claim 7, wherein the arc extinguishing bars are divided into two groups, one group is a plurality of long arc extinguishing bars (120) arranged in an overlapping manner, the other group is a plurality of short arc extinguishing bars (130) arranged in an overlapping manner, and the short arc extinguishing bars (130) are arranged between the arc striking angle (400) and the long arc extinguishing bars (120).
  10. 10. The arc extinguishing system of the circuit breaker according to claim 7, wherein an arc striking plate (140) is arranged between the arc extinguishing grid plate and the arc extinguishing top plate (153).

Description

Arc extinguishing system of circuit breaker Technical Field The utility model relates to the technical field of piezoelectric devices, in particular to an arc extinguishing system of a circuit breaker. Background When the circuit breaker is opened, namely when the movable contact and the fixed contact are separated, an arc is generated, the arc enters the arc-extinguishing grid sheet under the action of electrodynamic force, and the arc-extinguishing grid sheet cuts the arc into a series of series-connected short arcs, so that the arc is thinned and the arc voltage is rapidly increased, and the aim of arc extinction is achieved. And meanwhile, an arc-extinguishing chamber made of gas-generating materials is arranged in the arc-extinguishing chamber, the arc-extinguishing chamber is eroded by an arc when the circuit breaker is disconnected, high-pressure gas is generated in the arc-extinguishing chamber to form a gas blow, and the arc is driven to rapidly enter the arc-extinguishing grid sheet. The conventional contact arc extinguishing system mainly comprises a fixed contact, an arc extinguishing chamber and a moving contact structure scheme, wherein an arc extinguishing principle mainly comprises that the moving contact and the fixed contact are quickly separated to elongate an arc, the arc enters an arc extinguishing device under the action of electric power, arc extinguishing grid plates in the arc extinguishing device divide the arc to form series short arcs, and the arc extinguishing grid plates cool the arc to extinguish the arc. The arc only enters the arc extinguishing device under the action of electrodynamic force, and has the problem of low arc moving speed, so that the arc extinguishing effect is limited. Disclosure of utility model Aiming at the defects existing in the prior art, the utility model aims to provide an arc extinguishing system of a circuit breaker. In order to achieve the above purpose, the present utility model provides the following technical solutions: an arc extinguishing system of a circuit breaker, comprising: an arc extinguishing chamber; The static contact assembly is arranged at the lower end of the arc extinguishing chamber and comprises a static contact, the static contact is formed by a front end U-shaped part 210 and a tail connecting part, the upper end face of the front end U-shaped part is provided with a static contact, the tail connecting part is provided with an arc striking angle, and the arc striking angle is arranged towards the static contact. The upper end of the arc striking angle is flush with the static contact welding surface. The distance between the front end of the arc striking angle and the static contact is 1-2mm. One side of the arc striking angle is riveted with the tail connecting part through an L-shaped connecting piece. And a magnetism increasing block is arranged in the middle of the front U-shaped part. And a positioning groove for fixing the magnetism increasing block is formed in the lower end face of the U-shaped part of the front end. The explosion chamber includes a pair of curb plate that set up relatively, along a plurality of arc chute pieces that upper and lower direction interval set up between two curb plates and set up the explosion chamber at the explosion chamber front end, the explosion chamber includes two arc-extinguishing side plates that set up relatively, sets up the static contact safety cover in arc-extinguishing side plate bottom and sets up the arc-extinguishing roof at two arc-extinguishing side plate tops, just the arc-extinguishing roof is sealed the upper end opening of explosion chamber. The bottom of the arc extinguishing side plate is provided with a slot for placing the magnetic increasing plate. The arc extinguishing grid plates are divided into two groups, one group is a plurality of long arc extinguishing grid plates which are overlapped, the other group is a plurality of short arc extinguishing grid plates which are overlapped, and the short arc extinguishing grid plates are arranged between the arc striking angles and the long arc extinguishing grid plates. An arc striking plate is arranged between the arc extinguishing grid sheet and the arc extinguishing top plate. The arc extinguishing device has the beneficial effects that space is vacated for the upper end of an arc striking angle through equipotential quick arc striking obliquely upwards, the number layout of the arc extinguishing chamber grid sheets is increased, and the arc extinguishing effect can be improved through increasing the number of the arc extinguishing chamber grid sheets. Through technical schemes such as increasing magnetic field striking, arc extinguishing bars equidistance striking and air blowing striking, promoted electric arc fast moving to extinguishing device, promoted the arc extinguishing effect. Drawings Fig. 1 is a schematic structural view of the present utility model. FIG. 2 is a schematic cross-sectional view of the pr