JP2522235B2 - Circuit breaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker having an arc extinguishing device formed by laminating a plurality of grids at predetermined intervals.

[0002]

2. Description of the Related Art As a structure in the vicinity of an arc extinguishing device in a circuit breaker of this type, there is a structure shown in FIG. 3
Is an arc extinguishing device, which is formed by stacking a plurality of grids 4, 4, --- with a side plate 5 and stacking them at a predetermined interval, and is formed by a side wall 7a and a bottom wall 7c of the housing 6. Housed in. The housing 6 is composed of a box-shaped body 7 having an opening on one side and a lid (not shown) attached so as to close the opening. The arc extinguishing chamber R has a space between both side walls 7a, 7a (inner surfaces of the body and the lid) of the arc extinguishing device 3 in the lateral direction.
The width of the arc-extinguishing device 3 is substantially equal to the width X of the arc-extinguishing device 3, and accommodates the tips of the first and second contacts (not shown) including the contacts in one of the lengthwise Y-directions. Reference numeral 8 is a lower arc traveling plate, which passes near the tip of the first contactor (not shown) and the bottom wall of the housing 6.
It extends along 7c and faces the lowermost grid 4a of the arc extinguishing device 3. 9 is the upper arc traveling plate, one piece (vertical piece) 9a
And another piece (horizontal piece) 9b, which is bent into an L-shape, one piece 9a is substantially fixed to the housing 6, and the other piece 9b faces the uppermost grid 4b of the arc-extinguishing device 3. There is.

The upper arc traveling plate 9 is, for example, a housing.
The frame is fixed to 6, the short-circuit current detecting device is fixed to the frame, and the piece 9a is fixed to the yoke.
The lateral width of the other piece 9b is substantially the same as the lateral width X of the arc extinguishing device 3, and is arranged with the arc extinguishing device 3 with a slight gap between the side walls 7a, 7a.

In such a circuit breaker, the arc generated when both contacts are separated is extended, jumped to both arc traveling plates, and introduced into the arc extinguishing device 3 to be divided. Is extinguished.

[0005]

By the way, when such an arc extinguishing action is performed, the arc extinguishing chamber R, the arc extinguishing device 3, and the other piece (horizontal piece) 9b of the upper arc traveling plate 9 are considerably damaged. The higher the temperature, the more pronounced the higher the breaking current. Since the upper arc traveling plate 9 is bent and the other piece 9b is cantilevered with respect to the one piece (vertical piece) 9a, it tends to deform due to residual stress at high temperature. Therefore, if the amount is large, the other piece (horizontal piece) 9b collides with the uppermost grid 4b to deform the arc extinguishing device 3 or the other piece 9b itself. Especially the side plate 5
When it is made of fiber to reduce the thickness, deformation or the like is likely to occur. If such deformation occurs, the arc extinguishing performance will deteriorate.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent the arc extinguishing device and the arc traveling plate from being easily deformed even when the arc extinguishing action is performed and the temperature becomes high. The purpose of the present invention is to provide a circuit breaker that can prevent the deterioration of short-circuit performance.

[0007]

The circuit breaker of the present invention comprises:
First and second contactors having contact points for performing contacting and separating operations;
An arc extinguishing device formed by laminating a plurality of grids at predetermined intervals, and a housing for forming an arc extinguishing device formed by a side wall or a bottom wall of the housing. An arc-extinguishing chamber having a width substantially equal to that of the arc-extinguishing device and accommodating the tip portions of the first and second contactors including contacts in one of the longitudinal width directions of the arc-extinguishing device, and the tip of the first contactor. It has a lower arc running plate that passes through the vicinity and extends along the bottom wall of the housing and faces the lowermost grid of the arc extinguishing device, and two pieces that are bent and are not at least on the same plane, and one piece is substantially A circuit breaker that is fixed to the housing and has the other piece facing the uppermost grid of the arc extinguishing device, and the other piece of the upper arc running plate is made slightly larger than the lateral width of the grid. And a housing located in the width direction of the arc extinguishing device. On the side wall of the grayed, restrict deformation of another piece abuts said other pieces of the upper arc running plate protruding from grid
It has a structure in which a step portion that can be formed is formed.

[0008]

According to this structure, even if the upper arc traveling plate bent and formed by the arc extinguishing action becomes high in temperature and another piece in the cantilevered supporting state is deformed by residual stress, the housing is immediately abuts varying the stepped portion formed on the side wall of the
The shape of the arc extinguishing device does not collide with the grid of the arc extinguishing device, so that the arc extinguishing device and the arc traveling plate are less likely to be deformed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention embodied in a remote control type circuit breaker will be described below with reference to FIGS. The members substantially similar to those of the conventional example described above are designated by the same reference numerals.

Reference numeral 1 denotes a first contactor, which has a contact point 1a at its tip end and is mounted on a contactor frame described later, and normally functions as a fixed contactor. Reference numeral 2 is a second contactor, which also has a contact 2a at one end which contacts and separates from the contact 1a, and an intermediate part of which is rotatably supported by a frame (not shown). Act as a child.

Reference numeral 3 denotes an arc extinguishing device, which is formed by stacking a plurality of grids 4, 4, --- with a side plate 5 so as to be laminated at a predetermined interval, and is formed by a side wall 7a and a bottom wall 7c of a housing 6. It is housed in the arc-extinguishing room R. The housing 6 is composed of a box-shaped body 7 having an opening on one side and a lid (not shown) attached so as to close the opening.

Both side walls 7a, 7a (inner surfaces of the body and the lid) located in the lateral width direction of the arc extinguishing device 3 constituting the arc extinguishing chamber R are bottom walls.
The distance from 7c to slightly above the uppermost grid 4b of the arc-extinguishing device 3 is approximately equal to the lateral width X of the arc-extinguishing device 3, but above it is wide. Therefore, the step D is formed at the position where the distance changes. Such an arc extinguishing chamber R is
The front end portions of the first and second contactors 1 and 2 including the contacts 1a and 1b are housed in one of the vertical widths in the Y direction.

Reference numeral 8 is a lower arc traveling plate, which is the first contactor 1.
Of the arc extinguishing device 3 and extends along the bottom wall 7c of the housing 6 to face the lowermost grid 4a of the arc extinguishing device 3. 9 is the upper arc traveling plate, one piece (vertical piece) 9a and the other piece (horizontal piece) 9b
Is bent into an L shape, one piece 9a is substantially fixed to the housing 6, and the other piece 9b faces the uppermost grid 4b of the arc extinguishing device 3. The other piece 9b is slightly larger than the lateral width X of the uppermost grid 4b, so that both lateral parts of the grid 9b protrude from the grid 4b to face the step D. The spacing of the portion the face-to-face is small, other
The piece 9b contacts the step D when trying to deform toward the arc extinguishing device 3 side.
And the deformation is restricted , so the other piece 9b is the top grid.
It does not collide with 4b etc. The piece 9a is fixed to the end of the U-shaped yoke of the short-circuit current detecting device 10, the short-circuit current detecting device 10 is fixed to a frame (not shown), and the frame is fixed to the housing 6.

Other components are typical of remote control type circuit breakers. That is, the opening / closing mechanism unit 11 drives the second contactor 2 in conjunction with the operation of the handle 12 and the abnormal current detecting units 10 and 13, and the substantially L-shaped contactor frame 14 and the contact pressure spring 15 together with the first contact spring 15. Supports contact 1.
The electromagnet device 16 receives the remote signal from the second contactor 2 at the position where it functions as a fixed contactor at the first position and at the position away from the second contactor 2 at the second position. It is equipped with a plunger 17 that displaces the child 1.
(The upper end of the plunger 17 and the lateral end of the contact frame 14 are connected).

A housing 6 composed of a body 7 and a lid (not shown) accommodates the above-mentioned members. Body 7
Has a handle insertion hole 7d and a display window 7e on the upper surface, and is equipped with a power supply side terminal 18, a load side terminal 19, and a remote signal terminal 20 on the left and right side surfaces. In addition, a partition 7f that houses the electromagnet device 16 and other conductive members in an insulating manner, a position restricting portion 7g that restricts predetermined positions of the contacts 1 and 2, and the like are provided inside. 7h is an exhaust opening.

In the embodiment, the example in which the circuit breaker of the remote control type is applied has been described, but the present invention is not limited to this, and the first contactor is the fixed contactor and the second contactor is the movable contactor. Needless to say, it can be applied to general circuit breakers.

[0017]

Since the circuit breaker of the present invention is constructed as described above, the arc-extinguishing action causes the bent upper arc traveling plate to reach a high temperature, and its cantilevered support state. Even if the other piece in is trying to deform due to residual stress,
Immediately contact the step formed on the side wall of the housing to deform
The arc extinguishing device is regulated and does not collide with the grid of the arc extinguishing device. Therefore, the arc extinguishing device and the arc traveling plate can be less likely to be deformed, and thus the deterioration of the short-circuit performance can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part thereof.

FIG. 3 is an enlarged perspective view of a main part showing a conventional example.

[Explanation of symbols]

 1 First contactor 2 Second contactor 3 Arc extinguishing device 4 Grid 5 Side plate 6 Housing R Arc extinguishing chamber D Step 8 Lower arc traveling plate 9 Upper arc traveling plate 9b Other piece

Claims (1)

(57) [Claims] 1. An arc extinguishing device comprising first and second contactors having contact points for performing contacting and separating operations, a plurality of grids stacked at predetermined intervals, and a side wall and a bottom wall of a housing. A first arc containing a contact in one of the longitudinal width directions of the arc extinguishing device, the space between both side walls of the arc extinguishing device being substantially the same as the lateral width of the arc extinguishing device. And an arc extinguishing chamber accommodating the tip of the second contactor, and a lower arc extending along the bottom wall of the housing passing near the tip of the first contactor and facing the bottom grid of the arc extinguishing device. A running plate and an upper arc running plate having two bent and non-coplanar pieces, one of which is substantially fixed to the housing and the other of which faces the uppermost grid of the arc extinguishing device; In the circuit breaker equipped with, the other piece of the upper arc traveling plate from the lateral width of the grid The side wall of the housing located in the lateral width direction of the arc extinguishing device is made slightly larger, and abuts against another piece of the upper arc traveling plate protruding from the grid.
A circuit arc extinguisher, wherein a step portion capable of restricting deformation of one piece is formed.