CN220021016U - On-off mechanism of crank rotary double-break-point circuit breaker - Google Patents

Abstract

The utility model relates to the field of breaker on-off mechanisms, in particular to a crank rotary double-breakpoint breaker on-off mechanism. The safety problem caused by the fact that no rebound prevention measures are arranged on the traditional conductive bridge is solved. The rotary conductive bridge is arranged on the fixed disc through a core column, symmetrically arranged rotary cranks are arranged on the fixed disc, contact springs are hung between the cranks and the core column, and meanwhile the cranks are nested in movable holes of the conductive bridge. The device adopts the mode of matching the crank, the contact spring and the conductive bridge, so that the hidden danger of the conductive bridge in rebound caused by impact can be effectively avoided while effective contact of dynamic and static electric shock is ensured, and the safety performance of the plastic shell type circuit breaker is improved.

Description

On-off mechanism of crank rotary double-break-point circuit breaker

Technical Field

The utility model relates to the field of breaker on-off mechanisms, in particular to a crank rotary double-breakpoint breaker on-off mechanism.

Background

The plastic shell type circuit breaker is used as one of low-voltage circuit breakers and is commonly used for protecting low-voltage distribution circuits, motor protection circuits and various electric equipment. The circuit breaker contact system has the main functions of switching on, carrying and switching off current under normal circuit conditions, or when overload and short circuit occur in the circuit, the moving contact and the fixed contact of the circuit breaker contact system are forced to be rapidly separated due to the generation of electric repulsive force, so that the protection of the circuit is realized. After disconnection, the conductive bridge needs to be reliably locked temporarily to prevent the conductive bridge from falling off and conducting for the second time, and the temporary locking function of the current similar products mainly depends on a shoulder-groove-bayonet lock structure, so that the phenomena of wear and unbalanced stress of springs can occur after repeated reciprocation, and temporary locking failure can be caused. The utility model adopts a crank rotary breaking and temporary locking structure, takes the dead point position formed by the crank and the spring which are collinear as a boundary, realizes the temporary lock by means of the tension of the spring, avoids unbalanced stress of the spring, reduces the influence of abrasion on the temporary lock, and has higher reliability.

Disclosure of Invention

The utility model provides an on-off mechanism of a crank rotary double-breakpoint circuit breaker, which effectively solves the problem of failure caused by the fact that the temporary lock function of the existing rotary double-breakpoint plastic shell circuit breaker is worn.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a make-and-break mechanism of crank rotation type double break point circuit breaker, includes fixed disk 1, installs rotatable conductive bridge 4 through stem 101 on the fixed disk 1, install rotatable crank 2 of symmetry installation on the fixed disk 1, the articulated contact spring 3 that has between crank 2 and the stem, crank 2 nestification is in the movable hole 401 of conductive bridge 4 simultaneously.

One crank arm of the crank 2 is arranged in the rotating hole 102 of the fixed disc 1, and the other crank arm of the crank 2 is connected with the contact spring 3 in a hanging way and is nested in the movable hole 401 of the conductive bridge 4.

Two symmetrical groups of movable holes 401 are arranged on the conductive bridge 4.

The beneficial effects of the utility model are as follows: 1) Under the action of the contact spring and the crank, the movable contact of the conductive bridge is contacted with the static contact of the static contact plate, wherein the mechanical moment generated by the contact spring is expressed as the direction that the movable contact is pressed towards the static contact, and when the movable contact and the static contact are worn for a long time, the effective contact of the movable contact and the static contact can be ensured.

2) When the conductive bridge moves to the maximum opening position, potential hazards such as arc reburning and the like caused by falling back due to collision of the conductive bridge to the stop surface are avoided, and the safety performance of the molded case circuit breaker is improved.

Drawings

FIG. 1 is a first view of the present utility model;

FIG. 2 is a second state diagram of the present utility model;

FIG. 3 is a third view of the present utility model;

FIG. 4 is a schematic view of a stator plate structure;

FIG. 5 is a schematic diagram of a conductive bridge structure;

FIG. 6 is a schematic diagram of a crank construction;

the figure shows: the fixed disk 1, the stem 101, the rotary hole 102, the crank 2, the contact spring 3, the conductive bridge 4 and the movable hole 401.

Detailed Description

The technical scheme of the utility model is further described below by specific embodiments with reference to the accompanying drawings:

example 1

The on-off mechanism of the crank rotary double-break-point circuit breaker shown in fig. 1 comprises a fixed disc 1, a crank 2, a contact spring 3 and a conductive bridge 4.

The structure of the stator 1 is shown in fig. 4, a stem 101 is arranged in the center of the active area of the stator 1, and two symmetrical rotating holes 102 are arranged in the active area.

Crank 2 as shown in fig. 6, the crank 2 is composed of a crank pin and two crank arms connected.

The structure of the conductive bridge 4 is shown in fig. 5, and two symmetrical bar-shaped movable holes 401 are provided on the conductive bridge 4.

In the specific installation, one crank arm of the crank 2 is installed in the rotating hole 102 of the fixed disk 1, meanwhile, the other crank arm of the crank is connected with the contact spring 3 in a hanging mode, the core column 101 is provided with the conductive bridge 4, and meanwhile, the crank arm for hanging the contact spring 3 is nested in the movable hole 401 of the conductive bridge 4.

When the circuit works normally, under the action of the tension force of the contact spring 3, the movable contact on the conductive bridge 4 is pressed on the static contact plate through the crank 2, so that the normal conduction of the current is realized;

when fault current occurs in the circuit, the electric repulsive force generated between the movable contact and the fixed contact overcomes the action of a spring force, so that the conductive bridge 4 rotates clockwise along the stem 101 until the conductive bridge passes through the position of the maximum deformation amount of the contact spring 3, and under the action of the spring force, the conductive bridge 4 continues to rotate clockwise to the position of the maximum opening distance and finish temporary locking;

meanwhile, after the tripping device of the circuit breaker operating mechanism spontaneously completes tripping, the conductive bridge is pressed at the temporary lock position, so that the free breaking of the circuit breaker is thoroughly realized.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (3)

1. The utility model provides a make-and-break mechanism of crank rotation type double break point circuit breaker, includes the fixed disk, installs rotatable conductive bridge, its characterized in that through the stem on the fixed disk: the fixed disk is provided with symmetrically-installed rotatable cranks, contact springs are hung between the cranks and the core column, and the cranks are nested in movable holes of the conductive bridge.

2. The on-off mechanism of a crank rotary double-break circuit breaker according to claim 1, characterized in that: one crank arm of the crank is arranged in a rotating hole of the fixed disc, and the other crank arm of the crank is connected with a contact spring in a hanging mode and is nested in a movable hole of the conductive bridge.

3. The on-off mechanism of a crank rotary double-break circuit breaker according to claim 2, characterized in that: two symmetrical groups of movable holes are arranged on the conductive bridge.