JPS594536Y2 - Arc extinguishing device for hardwire circuit breakers - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an arc extinguishing device for a molded circuit breaker.

Conventionally, in this type of arc extinguishing device, as shown in FIG. Exhaust hole plate 6
There is a drawback that the arc is reflected by the wall surface opposite to the arc extinguishing plate 5' through the exhaust hole of the exhaust hole plate 6', and the arc suction becomes slow.

Therefore, the blocking characteristics were not good.

The present invention aims to provide an arc extinguishing device that eliminates the above-mentioned drawbacks.

The present invention will be explained below with reference to the drawings.

1 and 2, reference numeral 1 denotes an arc extinguishing device for a molded case circuit breaker, and an upper arc traveling plate 3 extending from the vicinity of the contact part 2.
A plurality of arc extinguishing plates 5 are laminated at a predetermined distance between the arc running plate 4 and the lower arc running plate 4.

Reference numeral 6 denotes an exhaust hole plate, which is arranged at the rear end of the stacked arc extinguishing plates 5.

Reference numeral 7 denotes a cylindrical exhaust groove, which is bored in a wall surface facing the exhaust hole 6 at a predetermined interval in parallel to the stacking direction of the plurality of arc extinguishing plates 5.

Reference numeral 8 denotes an exhaust port, which communicates the space between the exhaust hole plate 6 and the opposing wall surface to the outside of the casing 9, and has one end of the exhaust groove 7 opened.

Reference numeral 10 denotes a movable contact of the contact portion 2, which is brought into contact with a fixed contact 11 formed at one end of the lower arc traveling plate 4.

The operation of the present invention will now be described in detail.

When the movable contact 10 is rapidly separated from the fixed contact 11 in the contact portion 2, an arc is generated and is caused to flow in the direction of the laminated arc extinguishing plate 5 by the action of the upper arc running plate 3 and the lower arc running plate 4. It will be done.

The arc is divided and extinguished by the laminated arc extinguishing plates 5.

When the arc is extinguished, the exhaust gas, that is, the ionized gas with a poor insulation condition, is moved through the exhaust hole of the exhaust hole plate 6 into the space between the exhaust hole plate 6 and the opposing wall surface, and is moved into the cylindrical exhaust groove 7 of the opposing wall surface. to invade.

Almost all of the exhaust gas that has entered the exhaust groove 7 moves within the exhaust groove 7 toward the exhaust port 8.

FIG. 3 shows another embodiment of the arc extinguishing device of the present invention, in which in the embodiment shown in FIGS. 1 and 2, an inclined surface facing the exhaust hole plate 6 is formed on the intermediate wall surface between the exhaust grooves 7. has been done.

This allows the exhaust gas to enter the exhaust groove 7 smoothly.

FIG. 4 shows another embodiment of the arc extinguishing device of the present invention, in which the depth of the exhaust grooves 7 is different from that of the adjacent exhaust grooves 7 in the embodiment shown in FIG.

Thereby, it is possible to suitably prevent the exhaust gas that has once entered from being reflected in the direction of the exhaust hole plate 6.

Note that the cross-sectional shape of the exhaust groove 7 does not have to be limited to a substantially circular shape, and the shape is not limited as long as the distance between the opening on the side of the exhaust hole plate 6 and the other part is large.

As is clear from the above, in the arc extinguishing device of the present invention, an exhaust groove is bored in the wall surface facing the exhaust hole plate disposed near the rear end of the arc extinguishing plate in the stacking direction of the arc extinguishing plate; Since the exhaust groove is open to the exhaust port, (a) it is possible to prevent the reflection of the exhaust gas from the opposing wall as much as possible, which in turn promotes the attraction of the arc to the arc extinguishing device. Realizes extremely practical effects that can improve the

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along line A-A of an embodiment of the arc extinguishing device of the present invention;
FIG. 2 is a cross-sectional view taken along the line BB, FIGS. 3 and 4 are examples of the respective embodiments, and FIG. 5 is a conventional example. 1... Arc extinguishing device, 2... Contact part, 3.
... Upper arc running plate, 4... Lower arc running plate, 5... Arc extinguishing plate, 6... Exhaust hole plate, 7...・Exhaust groove, 8...exhaust port,
9...Casing, 10...Movable contact, 11...Fixed contact.

Claims (5)

[Scope of utility model registration request] (1) A plurality of arc extinguishing plates stacked at intervals between an upper arc running plate and a lower arc running plate extending from the vicinity of the contact portion, and a plurality of arc extinguishing plates arranged near the rear end side of the arc extinguishing plates. an exhaust hole plate, a plurality of exhaust grooves bored in a wall surface facing the exhaust hole plate at a distance in a stacking direction of the plurality of arc extinguishing plates, and a space between the exhaust hole plate and the opposing wall. An arc extinguishing device for a molded case circuit breaker, comprising one end of a space between the two and an exhaust port connecting one end of the plurality of exhaust grooves to the outside of the casing. (2) The arc extinguishing device for a molded circuit breaker according to claim 1, wherein the distance of the other part of the exhaust groove facing the exhaust hole plate is larger than the distance of the opening facing the exhaust hole plate. (3) The arc extinguishing device for a molded circuit breaker according to claim 2, wherein the exhaust groove has a substantially circular cross-sectional shape. (4) The arc extinguishing device for a molded circuit breaker according to claim 3, wherein an inclined surface facing the exhaust hole plate is formed on an intermediate wall surface between adjacent exhaust grooves. (5) The arc extinguishing device for a molded case circuit breaker according to claim 4, wherein adjacent exhaust grooves are formed at different depths.