DE7333155U - Arc chamber - Google Patents

Description

Light arc extinguishing chamber

The innovation relates to an arc extinguishing chamber for electrical circuit breakers, in particular miniature circuit breakers with arc quenching plates which have an approximately U-shaped.ige recess through which the movable contact arm moves during a switching operation.

During a switching operation in a line circuit breaker, there is between the movable and the fixed contact piece an arc that must be extinguished when it is switched off. This is done by bending the light drives into a so-called quenching chamber with many quenching plates arranged parallel to one another, in which it is divided into a large number of smaller arcs corresponding to the number of quenching plates and at the same time a zero crossing of the voltage goes out.

In order to achieve a high arc voltage, it is desirable to use as many arc splitters as possible in the specified To accommodate chamber space and thus to get as many small arcs as possible. The number of quenching plates is but limited by two sizes. The distance between the sheets must not fall below a certain value,

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because if the distance is too small, the liquefied metal that forms at the arc base points conducts Can form bridges between the quenching plates. This cancels the effect of one quenching plate. The other size that must be adhered to is the thickness of the quenching plate, which does not have a certain value may fall below. This is due to the fact that the material is liquefied by the arc roots, so that thereby the thermal load becomes uneven. If the individual sheet is too thin, it can easily be Distortions, so that the distance between individual sheets is no longer the same.

The task of the innovation is to design an arc chamber in such a way that that the space requirement of a certain number of quenching plates is reduced.

This object is achieved according to the invention in that the individual quenching plates are essentially transverse to the direction of travel dss arc stiffening beads. In an advantageous embodiment of the invention, it is proposed that that the bead of each quenching plate is formed as a kink on the edge opposite the recess. '

In a particularly advantageous embodiment of the invention the stiffening bead is approximately U-shaped running parallel to the recess for the movable contact arm.

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The beads for the quenching plates are expediently located an extinguishing chamber in the same place.

Due to the stiffening beads, it is possible to use the individual The extinguishing plates must be made thinner, as the beads guarantee the required rigidity of the individual extinguishing plates. This means that more extinguishing plates can be accommodated in a given space and, as a result, higher ones Arc voltages are extinguished at the same height of the arcing chamber. On the other hand, the space requirement is reduced of an arc-quenching plate pack if the number of arc-quenching plates is left the same.

With the aid of the drawing, two exemplary embodiments of the innovation are to be explained in more detail. Show it:

Fig. 1 Fig. 2

Fig. 3 Fig. 4

an extinguishing chamber under supervision.

a cross section according to line I-I through the arcing chamber of FIG. 1;

an extinguishing chamber with a second embodiment of a stiffening Si cke and

a cross section through the extinguishing chamber of FIG. 3 along the line H-II,

The extinguishing chambers shown in FIGS. 1-4 each have only four quenching plates. Each extinguishing plate of the first embodiment according to FIGS. 1 and 2 has an approximately V-shaped recess 2 through which the movable contact arm, not shown in the drawing, is a

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PoMF 1 (070.1OOOO / KE)

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Circuit breaker, in which the extinguishing chamber according to the innovation can be used, moves. At the top la one Each quenching plate 1 is provided with a bend 3 which serves as a stiffening bead for the quenching plate. All quenching plates 1 are corrugated identically and thus run exactly parallel. *

The quenching plates 4 of the second embodiment according to FIGS. 3 and 4 also have an approximately V-shaped recess 5, which in its shape of the recess 2 of
Extinguishing plates 1 of Fig. 1-2 corresponds. Approximately parallel to this recess 5 is a bead 6, which is formed et- ■ »a U-shaped. The legs 7 of the U-shaped stiffening bead 6 run essentially
parallel to the edge line of the recess 5. Of course, the stiffening beads can assume any shape; they should only, as has been found to be optimal, run roughly across the path of the arc.

Pat 4 F I (07ΟΛ0ΟΟΟ / ΚΕ)

Claims (1)

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«<No. 630/73 ^ J 1. Protection claims Arc extinguishing chamber for electrical circuit breakers, in particular miniature circuit breakers, with arc extinguishing sheets, which have an approximately U-shaped recess, through which the movable contact arm of the switch moved during a switching operation, characterized in that that the individual quenching plates (1 or 4) essentially ο 2. stiffeners running transversely to the arc
have fastening beads (3 or 6). Arc extinguishing chamber according to Claim 1, characterized net that the bead (3) of each quenching plate (1) on which the Recess (2) opposite edge designed as a kink 3. forms is. Light arc extinguishing chamber according to claim 1, characterized net that the bead (6) is approximately U-shaped and in the O essentially parallel to the recess (5) for the moving 4th lichen contact arm runs. Arc extinguishing chamber according to one of Claims 1 to 3 _t da characterized in that the stiffening beads (3 or 6) for the quenching plates (1 or 4) of an arc quenching chamber PaM FI are provided in the same place. (1069.5000 / EA) "I 3 0 3> 3 0 ~ 6 December 73