CN101051579A

CN101051579A - Low voltage circuit breaker with quick ectuating function

Info

Publication number: CN101051579A
Application number: CN 200710068481
Authority: CN
Inventors: 敖登贵; 汪泰宇; 鲁骞
Original assignee: CHINT GROUP Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2007-05-10
Filing date: 2007-05-10
Publication date: 2007-10-10
Anticipated expiration: 2027-05-10
Also published as: CN101051579B

Abstract

The circuit breaker in low voltage includes shell body and handle. Following parts are setup inside the shell body: operating mechanism, at least an arc extinguishing system, electromagnetic tripping system, actuator, and at least a pair of static contactor and a pair of moving contactor configured oppositely. Characters are that a piston device is setup between the actuator and the extinguishing system. The piston device includes parts: piston cavity body connected to the extinguishing system; being setup inside the piston cavity body, piston rod with its end portion being configured to the first rod of the actuator oppositely; and a reset spring. Features are that when short circuit in large current occurs, the disclosed breaker acts before electromagnetic tripping system acts, which is to say it acts within shorter time so as to cut off circuit more safely.

Description

A kind of low-voltage circuit breaker with fast actuating function

Technical field

The present invention relates to a kind of low-voltage electrical apparatus, relate in particular to a kind of low-voltage circuit breaker with fast actuating function, is a kind of low-voltage miniature circuit breaker with air pressure tripping function specifically.

Background technology

As everyone knows, low-voltage electric system need use suitable protective device, and this protective device generally is circuit breaker and miniature circuit breaker.The width of miniature circuit breaker all is the multiple of the width of the width of standard module or standard module, and in relevant international standard, miniature circuit breaker generally is installed on the DIN track of standard.The miniature circuit breaker major requirement has such ability: can utilize the protection of guaranteeing any fault that takes place in the low-voltage electric system is carried out enough levels fast opening time, only take as far as possible little space simultaneously.

For a long time, the designer is when the low-voltage miniature circuit breaker of the big electric current (for example rated current of 125A) of design, exist the problem that dynamic and static contact separates with being difficult to fast and reliable when tripping operation takes place circuit, and the speed of operate time is determining the quality of circuit breaker performance.

The CN1953123A Chinese patent application that our company produces is provided with an actuator between electromagnetic trip system and operating mechanism, amplify by the active force of lever principle with the electromagnetic trip system, reaches the purpose of fast actuating.This technical scheme has improved the disconnection performance in the miniature circuit breaker effectively, but does not reach perfect as yet.

Summary of the invention

What the present invention will solve is the problems referred to above that prior art exists, provide a kind of fast actuating low-voltage circuit breaker with better function, when being intended to not increase the volume of electromagnetic trip system, the dynamic and static contact that can make circuit breaker more reliably, separately apace.

The technical scheme that addresses the above problem employing is: a kind of low-voltage circuit breaker with fast actuating function, comprise housing and handle, be provided with operating mechanism in the described housing, at least one arc quenching system, at least one pair of fixed contact and the moving contact of electromagnetic trip system and configuration relatively, also be provided with an actuator between described electromagnetic trip system and the operating mechanism, described actuator is articulated on the described housing, comprise with first bar of the unshakable in one's determination relative configuration of described electromagnetic trip system and with the release lever of described operating mechanism second bar of configuration relatively, and the rotation arm of force of described first bar is greater than the rotation arm of force of second bar, it is characterized in that also being provided with a piston apparatus between described actuator and arc quenching system, described piston apparatus comprises the piston cavity that communicates with described arc quenching system, be arranged in the piston cavity and the piston rod of end and the relative configuration of first bar of described actuator, and back-moving spring.

Under normal circumstances, the closing of circuit breaker, separating brake are realized by operating grip, when short circuit appears in circuit, the iron core of instantaneous operation system removes to promote the actuator circuit breaker trip because the effect of magnetic force produces motion, but when the short-circuit conditions of big electric current occurring, because the short circuit energy is very big, air pressure in the arc quenching system raises rapidly, when reaching certain threshold values, the piston rod of piston apparatus removes to promote actuator, actuator rotates immediately, then promotes release lever tripping operation again, makes the dynamic and static contact of circuit breaker can be more reliably, disconnects apace.After short circuit disappeared, piston rod returned to original position under the effect of back-moving spring.Like this,, shortened the time of disjunction greatly, improved the reliability of disjunction owing to adopt the air pressure trip gear.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is the structural representation of circuit breaker of the present invention at closing position.

Fig. 2 is that piston apparatus part among Fig. 1 is along the cutaway view enlarged drawing of M-M.

The schematic diagram of piston apparatus actuating state among Fig. 3.

Fig. 4 is the structural representation of circuit breaker of the present invention at open position.

Embodiment

Referring to Fig. 1, the low-voltage circuit breaker 1 (circuit breaker is in closing position) with air pressure tripping function has housing 12, and handle 3 is installed on the pivot 2 of housing 12, and handle 3 can rotate between closing position and open position around pivot 2.Operating mechanism 7 is installed on the pivot 6 in the housing 12, rotates between closing position and open position around pivot 6, and the final moving contact 10 that is assemblied on the operating mechanism 7 that makes rotates between closing position and open position.Connecting rod 4 is used to connect handle 3 and operating mechanism 7, makes circuit breaker 1 form parallel motion.Release lever 8 is installed in operating mechanism 7, and its effect is conspicuous, can accelerate the motion of moving contact 10.Fixed contact 13 is installed in the housing 10, with the match power supply of incompatible realization circuit of moving contact.

Electromagnetic trip system 18 is positioned at the below of housing 12 inner handles 3, and its effect is now easily seen.Arc quenching system 15 is installed in the housing 12, is positioned at the below of electromagnetic trip system 18.It has run-on

tab

11,14 and arc control device 17.Actuator 20 is installed on the pivot 5 of housing 12, and between electromagnetic trip system 18 and operating mechanism 7, such installation makes the existence of actuator 20 need not to increase the length and the height of housing 12.It has first bar 19, second bar 9 and the back-moving spring.(seeing the specification that CN1953123A has the low-voltage circuit breaker of fast actuating function for details)

Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, piston apparatus 16 is installed between actuator 20 and the arc quenching system 15, and it comprises piston cavity 23, piston rod 22, and back-moving spring 21.One end of piston cavity 23 leaves a hole that communicates with arc quenching system, and the other end is provided with an aperture that supplies piston rod 22 to pass through.Piston rod 22 is arranged in the piston cavity 23, one end communicates with arc quenching system by the hole of piston cavity 23, and be subjected to the restriction of run-on tab 14, the other end passes through and offers aperture on the piston cavity 23 and cooperate with first bar 19 of actuator 20, make actuator 20 rotations, thereby realize the disjunction of circuit breaker 1.Under normal circumstances, the disconnection of circuit breaker 1 realizes by pulling handle 3.When circuit is short-circuited, air pressure in the arc quenching system 15 raises rapidly, if moment reaches certain threshold values, at this moment the piston rod 22 of piston apparatus 16 goes compression reseting spring 21 to promote first bar 19 of actuator 20, make actuator 20 rotations, second bar 9 of actuator 20 removes to promote the release lever 8 of operating mechanism 7, thereby realize the quick disjunction of circuit breaker 1, short circuit disappearance back piston bar 22 returns to original position under the effect of back-moving spring 21, same actuator 20 also can return to original position under the effect of back-moving spring; If moment does not reach certain threshold values, at this moment the iron core of electromagnetic trip system 18 removes action to promote first bar 19 of actuator 20, realizes the quick disjunction of circuit breaker 1.

Obviously, the benefit that piston apparatus 16 brings is when big short circuit current occurring, and it can move before 18 actions of electromagnetic trip system, that is to say in the shorter time and moved, safer cut-out circuit.

What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.

Claims

1, the low-voltage circuit breaker that has the fast actuating function, comprise housing (12) and handle (3), be provided with at least one pair of fixed contact (13) and the moving contact (10) of operating mechanism (7), at least one arc quenching system (15), electromagnetic trip system (18) and configuration relatively in the described housing (12); Be provided with an actuator (20) between described electromagnetic trip system (18) and the operating mechanism (7), described actuator (20) is articulated on the described housing (12), comprise with first bar (19) of the unshakable in one's determination relative configuration of described electromagnetic trip system and with the release lever of described operating mechanism second bar (9) of configuration relatively, and the rotation arm of force of described first bar (19) is greater than the rotation arm of force of second bar (9), it is characterized in that also being provided with a piston apparatus (16) between described actuator (20) and arc quenching system (15), described piston apparatus (16) comprises the piston cavity (23) that communicates with described arc quenching system, be arranged in the piston cavity and the piston rod (22) of end and the relative configuration of first bar of described actuator, an and back-moving spring (21).