JPH0410324A - Arc-extinguishing device - Google Patents

Abstract

PURPOSE:To simplify the assembly by forming an exhaust window in the upper part of an insulating frame, and dividing the insulating frame into two of the exhaust window side and a grid side, and forming a wall member for supporting the grid integrally with the inside of the insulating frame, and drilling exhaust holes for communicating with the exhaust window side in the wall member. CONSTITUTION:A wall member 30 for dividing an insulating frame 25 into two of an exhaust window 26 side and a grid 21 side is formed integrally with the upper part of the insulating frame 25. Multiple exhaust holes 24 for exhausting the arc gass are drilled in the wall member 30, and the grid 21 is supported for fixation by the wall member 30. A steadying part for steadying the grid 21 is thereby eliminated by supporting the grid 21 with the wall member 30 formed in the insulating frame 25, and a large exhaust space can be therefor obtained to improve the arc-extinguishing property. Thus the number of parts is reduced, and the assembly is simplified, and a cost down is aimed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an arc extinguishing device used in a switch or the like.

[Prior Art] FIG. 3 shows a sectional view of a breaker using a conventional arc extinguishing device. First, the overall configuration of the breaker will be schematically explained. In the body 1, a fixed core 4 is disposed within a coil bobbin 3 around which a coil 2 is wound, and a movable core 5 that is attracted to the fixed core 4 is provided. The transverse movement of the movable core 5 is converted into vertical movement by a conversion shaft 6, and a link mechanism 7 is driven by a pin connected to the conversion shaft 6. A movable contact 8 is provided which is driven in accordance with the operation of the link machine 1147, and a movable contact 9 is fixed to the lower surface of the tip of the movable contact 8. A terminal portion 12 is formed at the other end of the terminal plate 11, to which a fixed contact 1.0 facing the movable contact 1.0 is fixed.

The base side of the movable contactor 8 is connected to the other terminal portion 15 via a short circuit coil 13 for detecting short circuit current, a bimetal 14 for detecting overcurrent, and the like. Also, short circuit coil 1
A trip mechanism 16 is provided which is driven by the contact point 3 and the bimetal 14 to forcibly open the contacts 9 and 1o. Handle 1 with the operating section exposed from the top surface of the cover 17
8 is disposed inside the cover 17, and the micro switch 19 can be turned on and off by operating the handle 18.
The contacts 9 and 10 are closed by the on output of the microswitch 19 and the on output of an external switch for remote control. That is, this breaker is configured to open and close contacts 9 and 10 by remote control.

Further, this breaker is provided with an arc extinguishing device 20 for extinguishing the arc generated when the contacts 9 and 10 open. As shown in FIGS. 3 and 4, this arc extinguishing device 20 includes two arc running plates 27.28 for guiding an arc, and a large number of grids 2 disposed between the arc running plates 27.28.
1, a side plate 22 that supports the grid 21 and is located on the side of the grid 21, an exhaust plate 23 with an exhaust hole 24 arranged above the grid 21, and an insulating frame 25' that covers each of these members. It is made up of. This insulating frame 25' is formed into a box shape with an open bottom, and has an exhaust window 2 at the top.
6 is formed.

[Problem to be solved by the invention] In the conventional arc extinguishing bag N20, the exhaust plate 2 is placed on the grid 21.
3 was placed on the insulating frame 25', and the exhaust plate 23 was held down by two holding parts formed inside the insulating frame 25'. Therefore, a holding part 29 for holding down the grid 21 is required in a part of the insulating frame 25', which causes the problem that the exhaust space becomes narrower.

Further, when assembling, if there is a positional shift between the grid 21 and the exhaust plate 23, there is a problem that it is difficult to assemble the insulating frame 25'.

The present invention has been provided in view of the above-mentioned points, and provides an arc extinguishing device that has a large exhaust space and is designed to simplify assembly.

[Means for Solving the Problems] The present invention forms an exhaust window in the upper part of an insulating frame, divides the exhaust window into two parts on the grid side, and places a wall supporting the grid inside the insulating frame. The wall body is formed integrally with the wall body, and an exhaust hole communicating with the exhaust window side is bored in this wall body.

[Function] Thus, the exhaust plate is integrally formed inside the insulating frame to provide a large exhaust space, and the number of parts is reduced to simplify assembly.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows an i-plane view of the entire structure, and FIG. 2 shows an exploded perspective view of the arc extinguishing device. The gist of the present invention is an arc extinguishing device, and since the overall configuration is the same as the conventional one, the arc extinguishing device will be described in detail.

As shown in FIGS. 1 and 2, the upper part of the interior of the insulating frame 25 is divided into two parts: the exhaust window 26 side and the grid 21 side!
2#30 are integrally formed.

The wall body 30 has an exhaust hole 24 for discharging arc gas.
are perforated in large numbers. Grid 21 at this wall 3o
I hold it down to support and fix it.

Thus, the arc generated when the contacts 9 and 1o open is guided into the grid 21 by the arc traveling plates 27 and 28,
The arc gas is extinguished by the grid 21 and exhausted through the exhaust hole 24 and exhaust window 26 of the wall 3o.

[Effects of the Invention] As described above, the present invention forms an exhaust window in the upper part of the insulating frame, divides the exhaust window portion and the grid side into two, and
A wall supporting the grid is integrally formed within the insulating frame,
Since this wall has an exhaust hole that communicates with the exhaust window, the grid is supported by the wall formed on the insulating frame. is no longer necessary, and as a result, a large exhaust space can be created.
It has the effect of improving arc extinguishing performance, and since the wall is integrally formed with the insulating frame, the conventional exhaust plate is no longer necessary, reducing the number of parts and simplifying assembly. This has the effect of reducing costs.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is an exploded perspective view of the arc extinguishing device shown above, Fig. 3 is a sectional view of a conventional example, and Fig. 4 is an exploded perspective view of the arc extinguishing device same as the above. It is. 20 is an arc extinguishing device, 21 is a grid, 24 is an exhaust hole, 25 is an insulating frame, 26 is an exhaust window, and 30 is a wall body.

Claims (1)

[Claims] (1) It consists of two arc running plates placed opposite each other to guide the arc, a number of grids arranged between the arc running plates, and an insulating frame that covers the arc running plates and grids. In the arc extinguishing device, an exhaust window is formed in the upper part of the insulating frame, and the part of the exhaust window and the grid side are connected to each other.
An arc extinguishing device characterized in that a wall body supporting the grid is integrally formed within an insulating frame, and an exhaust hole communicating with the exhaust window side is bored in the wall body.