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CN-224232629-U - Arc extinguishing structure of circuit breaker

CN224232629UCN 224232629 UCN224232629 UCN 224232629UCN-224232629-U

Abstract

The utility model belongs to the field of low-voltage switch equipment, and particularly relates to an arc extinguishing structure of a circuit breaker, which comprises a circuit breaker shell, an arc extinguishing chamber, a fixed contact and a moving contact, wherein the arc extinguishing chamber comprises a first arc extinguishing grid plate group, a second arc extinguishing grid plate group and a third arc extinguishing grid plate group which are sequentially arranged, the first arc extinguishing grid plate of the first arc extinguishing grid plate group is arranged along the horizontal direction, the third arc extinguishing grid plate of the third arc extinguishing grid plate group is obliquely arranged relative to the horizontal direction at an alpha angle, the outlet end of the third arc extinguishing grid plate group is inclined towards the direction of the second arc extinguishing grid plate group, the second arc extinguishing grid plate of the second arc extinguishing grid plate group is arranged at an beta angle with the adjacent arc extinguishing grid plates, the circuit breaker shell is provided with an outlet and is arranged at the outer side of the outlet of the second arc extinguishing grid plate group, and the moving contact of the fixed contact is arranged in the area among the first arc extinguishing grid plate group, the second arc extinguishing grid plate group and the third arc extinguishing grid plate group. Through optimizing the overall arrangement of arc extinguishing bars piece, effectively improve the arc extinguishing effect, reduce the circuit breaker temperature rise.

Inventors

  • YU LAIYUAN
  • WANG HANYU
  • KONG HAIPENG

Assignees

  • 浙江奔一新能源有限公司

Dates

Publication Date
20260512
Application Date
20250414

Claims (10)

  1. 1. An arc extinguishing structure of a circuit breaker comprises a circuit breaker shell (100), and an arc extinguishing chamber (200), a fixed contact (300) and a moving contact (400) which are arranged in the circuit breaker shell, and is characterized in that an exhaust port (110) is arranged on the circuit breaker shell; The arc-extinguishing chamber (200) comprises two fixing plates (210) and a first arc-extinguishing grid sheet group (220), a second arc-extinguishing grid sheet group (230) and a third arc-extinguishing grid sheet group (240) which are fixed between the two fixing plates (210) in sequence, The first arc-extinguishing grid plate group (220) consists of a plurality of first arc-extinguishing grid plates which are parallel, wherein the first arc-extinguishing grid plates are arranged along the horizontal direction, the third arc-extinguishing grid plate group (240) consists of a plurality of third arc-extinguishing grid plates which are parallel, the third arc-extinguishing grid plates are obliquely arranged at an angle alpha relative to the horizontal direction, the outlet ends of the third arc-extinguishing grid plates are inclined towards the direction of the second arc-extinguishing grid plate group (230), the angle alpha is larger than 45 degrees and smaller than 90 degrees, the second arc-extinguishing grid plate group (230) consists of a plurality of second arc-extinguishing grid plates, the interval between the second arc-extinguishing grid plates and the adjacent arc-extinguishing grid plates is smaller than the beta included angle of the interval between the outlet ends, and the beta is larger than 0 and smaller than 15 degrees; The exhaust port (110) is arranged outside the outlet of the second arc extinguishing grid sheet group (230); The stationary contact (310) of the stationary contact (300) and the movable contact (410) of the movable contact (400) are arranged in the area among the first arc extinguishing grid sheet group (220), the second arc extinguishing grid sheet group (230) and the third arc extinguishing grid sheet group (240).
  2. 2. The arc extinguishing structure of the circuit breaker according to claim 1, wherein an included angle beta between the second arc extinguishing gate sheet and the adjacent arc extinguishing gate sheet is equal.
  3. 3. The arc extinguishing structure of the circuit breaker according to claim 1, wherein the inlet ends of the second arc extinguishing bars of the second arc extinguishing bar sheet group (230) are arranged in a V shape.
  4. 4. The arc extinguishing structure of the circuit breaker according to claim 3, wherein the inlet ends of the first arc extinguishing bars of the first arc extinguishing bar sheet group (220) are obliquely distributed, and the inlet ends of the first arc extinguishing bars far away from the second arc extinguishing bar sheet group (230) are arranged towards the third arc extinguishing bar sheet group (240).
  5. 5. The arc extinguishing structure of the circuit breaker according to any one of claims 1 to 4, wherein the stationary contact (310) of the stationary contact (300) is disposed corresponding to the middle part of the third arc extinguishing gate sheet group (240), and the movable contact (410) of the movable contact (400) is rotatably disposed at one side of the stationary contact (300) far away from the first arc extinguishing gate sheet group (220).
  6. 6. The arc extinguishing structure of the circuit breaker according to claim 5, further comprising a slit assembly (500), wherein the slit assembly (500) comprises two gas generating plates (510) arranged in a region between the first arc extinguishing grid plate group (220), the second arc extinguishing grid plate group (230) and the third arc extinguishing grid plate group (240), a slit for accommodating the fixed contact (300) and the moving contact (400) is formed between the two gas generating plates (510), and the slit assembly (500) comprises a magnetism increasing plate (520) fixed outside the gas generating plates (510).
  7. 7. The arc extinguishing structure of the circuit breaker according to claim 6, wherein the slit assembly (500) is fixed to an inner wall of the circuit breaker case (100).
  8. 8. The arc extinguishing structure of the circuit breaker according to claim 5, wherein the fixed contact (300) comprises a first arc striking plate (320) extending to one side of the first arc extinguishing grid sheet group (220) far away from the second arc extinguishing grid sheet group (230), a distance of 5mm-10mm is formed between the first arc striking plate (320) and the first arc extinguishing grid sheet group (220), a second arc striking plate (250) is arranged on one side of the third arc extinguishing grid sheet group (240) far away from the second arc extinguishing grid sheet group (230), and an arc striking part extending to the moving contact (400) located at the opening position far away from the outer side of the fixed contact (300) is arranged on the second arc striking plate (250).
  9. 9. The arc extinguishing structure of the circuit breaker according to claim 8, wherein the moving contact (400) is provided with an arc striking tip (420), the arc striking tip (420) is positioned at the outer end part of the moving contact (400) and the rotating path of the arc striking tip is positioned outside the rotating path of the moving contact (410), and the arc striking tip (420) and the moving contact (410) are respectively positioned at two sides of the moving contact (400).
  10. 10. The arc extinguishing structure of the circuit breaker according to any one of claims 1 to 4, wherein the outlet ends of the first arc extinguishing grid sheet and the third arc extinguishing grid sheet are provided with gas leakage grooves (260) so that gas leakage passages are formed between the first arc extinguishing grid sheet group (220), the third arc extinguishing grid sheet group (240) and the circuit breaker shell (100).

Description

Arc extinguishing structure of circuit breaker Technical Field The utility model belongs to the field of low-voltage switching equipment, and particularly relates to an arc extinguishing structure of a circuit breaker. Background The circuit breaker is the most important distribution equipment in the low-voltage distribution system, and along with the continuous improvement of the requirements of power engineering on power sources and power transmission and distribution equipment, the performance requirements on the circuit protection switch are also higher and higher, and miniaturization, high performance, modularization and high reliability are the main development directions of the plastic-case circuit breaker at present. The contact system and the arc extinguishing system are important components of the molded case circuit breaker, the design is very critical, and the electrical life and breaking capacity of the molded case circuit breaker are directly related. The existing breaker static contact consists of a static contact plate and a static contact, and an arc striking structure for introducing an electric arc into an arc extinguishing chamber of the breaker is generally added near the static contact so as to reduce the residence time of the electric arc on the static contact, thereby reducing the burning loss of the electric arc to the static contact and playing a role in protecting the static contact. But the arc striking effect of the existing static contact is poor, the reliability of the circuit breaker is affected, and the breaking performance of the circuit breaker is reduced. Disclosure of utility model The utility model aims to overcome the defects and the shortcomings of the prior art and provides an arc extinguishing structure of a circuit breaker. The technical scheme adopted by the utility model is that the arc extinguishing structure of the circuit breaker comprises a circuit breaker shell, and an arc extinguishing chamber, a fixed contact and a moving contact which are arranged in the circuit breaker shell, wherein the circuit breaker shell is provided with a discharge port; The arc-extinguishing chamber comprises two fixed plates, a first arc-extinguishing grid sheet group, a second arc-extinguishing grid sheet group and a third arc-extinguishing grid sheet group which are fixed between the two fixed plates in sequence, The first arc-extinguishing grid sheet group consists of a plurality of first arc-extinguishing grid sheets which are parallel, wherein the first arc-extinguishing grid sheets are arranged along the horizontal direction, the third arc-extinguishing grid sheet group consists of a plurality of third arc-extinguishing grid sheets which are parallel, the third arc-extinguishing grid sheets are obliquely arranged at an angle alpha relative to the horizontal direction, the outlet ends of the third arc-extinguishing grid sheets are inclined towards the direction of the second arc-extinguishing grid sheet group, the angle alpha is larger than 45 degrees and smaller than 90 degrees, the second arc-extinguishing grid sheet group consists of a plurality of second arc-extinguishing grid sheets, the second arc-extinguishing grid sheets are arranged with the adjacent arc-extinguishing grid sheets at an included angle beta, the interval between the inlet ends of the second arc-extinguishing grid sheets is smaller than the interval between the outlet ends of the second arc-extinguishing grid sheets, and the beta is larger than 0 and smaller than 15 degrees; the exhaust port is arranged at the outer side of the outlet of the second arc extinguishing grid sheet group; The fixed contact of the fixed contact and the movable contact of the movable contact are arranged in the area among the first arc-extinguishing grid sheet group, the second arc-extinguishing grid sheet group and the third arc-extinguishing grid sheet group. And the included angle beta between the second arc-extinguishing gate sheet and the adjacent arc-extinguishing gate sheet is equal. And the inlet ends of the second arc-extinguishing grid plates of the second arc-extinguishing grid plate group are arranged in a V shape. The inlet ends of the first arc-extinguishing grid plates of the first arc-extinguishing grid plate group are obliquely distributed, and the inlet ends of the first arc-extinguishing grid plates far away from one side of the second arc-extinguishing grid plate group tend to be arranged on the third arc-extinguishing grid plate group. The fixed contact of the fixed contact is arranged corresponding to the middle part of the third arc-extinguishing gate sheet group, and the movable contact of the movable contact is rotatably arranged on one side of the fixed contact, which is far away from the first arc-extinguishing gate sheet group. The electromagnetic shielding device comprises a first arc-extinguishing grid plate group, a second arc-extinguishing grid plate group and a third arc-extinguishing grid pla