CN-224204078-U - Moving contact system and circuit breaker comprising same

CN224204078UCN 224204078 UCN224204078 UCN 224204078UCN-224204078-U

Abstract

The utility model provides a moving contact system and a circuit breaker comprising the same. The moving contact system comprises a plurality of contact fingers, a contact support piece, a plurality of springs and an insulation grid, wherein the contact fingers are arranged in parallel, the contact support piece comprises a support plate and a pair of support arms on two sides of the support plate, first ends of the contact fingers are pivotably arranged between the support arms, the springs are arranged corresponding to the contact fingers and are positioned between the contact fingers and the support plate of the contact support piece, and the insulation grid comprises connecting parts arranged between the contact fingers and the springs. According to the moving contact system, the insulating grids are arranged between the contact fingers and the corresponding springs, so that the springs can provide larger contact pressure and overcome electric repulsive force when the moving contact system is tolerant in short time, the tolerant performance is improved, meanwhile, the insulating grids and the contact fingers can keep synchronous movement, friction force is reduced in the switching-on/switching-off process, and the mechanical performance of the circuit breaker is improved.

Inventors

ZHANG PENGYU
SUN HAITAO
ZHANG JINDE
GUO WEI
LIU CHUYUAN

Assignees

施耐德电气工业公司

Dates

Publication Date: 20260505
Application Date: 20250429

Claims (12)

1. A moving contact system, characterized in that the moving contact system comprises: A plurality of finger contacts arranged in parallel; A contact support including a support plate and a pair of support arms on either side of the support plate, the first ends of the plurality of contact fingers being pivotally mounted between the pair of support arms; A plurality of springs disposed in correspondence with the plurality of contact fingers and located between the plurality of contact fingers and the support plate of the contact support member, and The insulating grille comprises a connecting part arranged between the contact finger and the spring.
2. The movable contact system according to claim 1, wherein one end of the spring abuts on the connecting portion and the other end of the spring abuts on the support plate.
3. The movable contact system according to claim 1, wherein the insulating grid further comprises a pair of insulating sheets connected by the connecting portion, the pair of insulating sheets sandwiching one contact finger therebetween and fitting with a contact finger adjacent to the pair of insulating sheets.
4. A moving contact system according to claim 3, wherein the insulating grid moves in synchronism with the contact fingers.
5. The movable contact system according to claim 4, wherein the contact support further comprises a support shaft disposed between the pair of support arms, The support shaft passes through the plurality of contact fingers and the insulating sheet so that the plurality of contact fingers and the insulating grid are rotatable about the support shaft.
6. The movable contact system of claim 1, further comprising a spacer bracket mounted to the contact support and including a spacer plate between the support plate and the plurality of contact fingers, The plurality of springs pass through the spacer plate so as to be located between the plurality of contact fingers and the support plate of the contact support.
7. The movable contact system according to claim 6, further comprising a conductive block and a soft coupling conductor, One end of the soft coupling conductor is connected to the first ends of the plurality of contact fingers, and the other end of the soft coupling conductor is fixed to the conductive block.
8. The movable contact system according to claim 7, further comprising a protection member protruding from an end of the spacing bracket opposite to the spacing plate and covering an outer side of the soft coupling conductor.
9. The movable contact system of claim 8, wherein the protective member is formed as an integral structure with the spacer bracket.
10. The movable contact system according to claim 1, wherein the first end of the contact finger comprises a contoured protrusion, the contact finger comprises a contact point on an outer surface thereof remote from the first end, A first side of the support plate adjacent to the first end of the contact finger is formed with a groove at a central position, When the first ends of the plurality of fingers are pivotally mounted between the pair of support arms, the hooked protrusion of at least one of the plurality of fingers in the intermediate position mates with the recess on the first side of the support plate such that the contact point of the at least one of the plurality of fingers in the intermediate position protrudes outwardly higher than the contact points of the other of the plurality of fingers.
11. A moving contact system according to claim 1 or 3, characterized in that the insulating grid is constituted by flexible insulating paper.
12. A circuit breaker, the circuit breaker comprising: the movable contact system according to any one of claims 1-11.

Description

Moving contact system and circuit breaker comprising same Technical Field The utility model relates to a moving contact system and a circuit breaker comprising the same. Background The circuit breaker is an important part of a power distribution electrical appliance, and is used for switching on and off current in a power grid circuit and protecting a line and power supply equipment from faults such as overload, undervoltage and short circuit. In actual use of the circuit breaker, when the circuit breaker is in a closed state, once a short circuit fault occurs in a line, the circuit breaker is required to be capable of bearing the electrodynamic action generated by a short circuit current and not to act in a designated time due to the requirement of selective protection. The existing contact fingers are isolated through the insulating sheet with the boss, but the problem that the gap between the contact fingers is uncontrollable exists, when the gap between the contact fingers is overlarge, the stability of the circuit breaker is poor when the circuit breaker tolerates for a short time, and the contact fingers can be caused to deviate laterally. When the gap between the contact fingers is too small, the friction force of the contact fingers in the moving process is too large, and the service life of the circuit breaker is low. Disclosure of utility model Therefore, in view of the above problems, the present utility model provides a moving contact system and a circuit breaker including the same. According to an embodiment of the utility model, a moving contact system comprises a plurality of contact fingers, a contact support piece, a plurality of springs and an insulation grid, wherein the contact fingers are arranged in parallel, the contact support piece comprises a support plate and a pair of support arms on two sides of the support plate, first ends of the contact fingers are pivotably arranged between the support arms, the springs are arranged corresponding to the contact fingers and are positioned between the contact fingers and the support plate of the contact support piece, and the insulation grid comprises connecting parts arranged between the contact fingers and the springs. In an embodiment, one end of the spring abuts against the connecting portion, and the other end of the spring abuts against the support plate. In one embodiment, the insulating grid further includes a pair of insulating sheets connected by the connection portion, the pair of insulating sheets sandwiching one contact finger therebetween and being attached to the contact finger adjacent to the pair of insulating sheets. In one embodiment, the insulating grid moves in synchronization with the contact fingers. In an embodiment, the contact support further includes a support shaft disposed between the pair of support arms, the support shaft passing through the plurality of contact fingers and the insulating sheet such that the plurality of contact fingers and the insulating grid are rotatable about the support shaft. In an embodiment, the movable contact system further comprises a spacer bracket mounted to the contact support and including a spacer plate between the support plate and the plurality of contact fingers, the plurality of springs passing through the spacer plate so as to be located between the plurality of contact fingers and the support plate of the contact support. In an embodiment, the moving contact system further comprises a conductive block and a soft coupling conductor, one end of the soft coupling conductor is connected to the first ends of the plurality of contact fingers, and the other end of the soft coupling conductor is fixedly connected to the conductive block. In one embodiment, the moving contact system further includes a protection member protruding from an end of the spacing bracket opposite to the spacing plate and covering an outer side of the soft coupling conductor. In one embodiment, the protective member is formed as an integrally molded structure with the spacer bracket. In an embodiment, the first end of the contact finger includes a shaped protrusion, the outer side surface of the contact finger remote from the first end includes a contact point, the first side of the support plate adjacent to the first end of the contact finger is formed with a groove at a central position, and when the first ends of the plurality of contact fingers are pivotally mounted between the pair of support arms, the hooked protrusion of at least one contact finger of the plurality of contact fingers at an intermediate position is engaged with the groove on the first side of the support plate such that the contact point of the at least one contact finger at the intermediate position protrudes outward higher than the contact points of the other contact fingers. In one embodiment, the insulating grid is constructed of flexible insulating paper. According to an embodiment of the utility model, a circuit breaker comprises