EP1042772B1 - Arc extinguisher for switchgear - Google Patents

Description

The invention relates to a switching device with a Arc quenching device with a fixed and a movable Contact point and with an arc chamber surrounding it, the as a package of U-shaped die-cut sheet is executed, the quenching plates at their the contact points opposite ends kept at a distance and to a Assembly are held together.

A generic switching device with an arc extinguishing device is disclosed in EP 0 556 109 A. With this Switching or protective device arises when the electrical is switched off Current at the opening contact points Electric arc. This arc causes at the contact points Wear, i.e. a contact erosion, and delays that Disconnect the circuit, since the current continues to flow, until the arc goes out. To the damage caused by the Restricting the arc is the electrical switching device equipped with the arc extinguishing device. This exists from an arc chamber, from baffles and various components, which among other things also fluidic tasks fulfill.

The arc chamber is here a package made of U-shaped die-cuts Quenching plates arranged in parallel and kept at a distance are. At the top and bottom of the arc chamber baffles are arranged, the fixed contact point with the upper baffle is connected.

The arc extinguishing device described above works in such a way that when opening the contact point Arc between the contact points that are spaced apart arises. This is due to electromagnetic Forces moved outward in the direction of the arc chamber. The arc base points migrate from the contact points away along the one electrically connected to the circuit Baffles. The arc has reached the quenching plates it is divided into partial arcs and by the quenching plates cooled down, causing the partial arcs to go out and stopping of the current flow.

The electromagnetic forces that separate the arc from the Moving contact points away to the arc chamber are all the more larger, the longer the legs or feet of the quenching plates are, i.e. the more pronounced the U-shape of the quenching plates are. Long feet, especially in the case of delicate designs by Extinguishing plates, bring problems with the extinguishing plate attachment yourself. It cannot be ruled out that the legs or Feet or toe of the baffle plates come together and weld.

The invention is therefore based on the object of a switching device with an arc quenching device of the above kind to improve that filigree designs of those in the assembly summarized quenching plates functionally reliable without additional effort can be assembled and fixed.

The object is achieved according to the features of claim 1.

Advantageous embodiments of the invention are the subclaims 2 and 3.

FIG 1

eine Lichtbogenlöscheinrichtung des erfindungsgemäßen Schaltgeräts mit aufgeschnittenem Schaltkammereinsatz und

FIG 2

die Lichtbogenlöscheinrichtung gemäß FIG 1 mit Befestigung der Löschbleche am Schaltkammereinsatz.

An embodiment of the invention is explained below with reference to a drawing. Show it:

FIG. 1

an arc extinguishing device of the switching device according to the invention with cut-out switching chamber insert and

FIG 2

the arc extinguishing device according to FIG 1 with attachment of the quenching plates on the switching chamber insert.

1 shows an arc extinguishing device of a switching device, which essentially consists of an arc chamber 1 from several U-shaped die-cut pieces assembled into a package Extinguishing plates 2 exist. The legs or feet 3 of the Extinguishing plates 2 surround a fixed 4 and a movable contact point 5 of the switching device. The two contact points 4 and 5 lie in a formed by the switching chamber insert 6 and shielded interior. The feet or legs 3 are through walls 8 of the switching chamber insert from the contact points 4 and 5 separately. Around the ends of the baffle plates 2, the facing away from the contact points 4, 5 is an insulating strip 7 folded, which keeps the quenching plates 2 at a distance and at the same time holds together to form an assembly.

2 shows the arc extinguishing device, with on the walls 8 of the switching chamber insert 6 grooves 9 provided on the outside into which the legs or feet 3 of the extinguishing plates 2 are inserted.

Claims (3)

1. Switching device having an arc quenching device with a fixed (4) and a moving (5) contact point and with an arcing chamber (1) surrounding them, which is in the form of a stack of arcing plates (2) which are stamped in a U-shape, with the arcing plates (2) being kept at a distance from one another at their ends facing away from the contact points (4,5) and being held together to form an assembly, characterized in that spacing means (9) are provided, which keep those limbs or feet (3) of the arcing plates (2) which are located in the region of the contact points (4,5) spaced apart from one another, with the spacing means (9) being integrally formed on a switching chamber insert (6) which separates the moving (4) and fixed (5) contact points from the limbs (3) of the arcing plates (2).
2. Switching device according to Claim 1, characterized in that the spacing means (9) are in the form of slots (9) which are integrally formed on the outside of the switching chamber insert (6) and into which the limbs (3) of the arcing plates (2) can be inserted in a positively locking manner.
3. Switching device according to Claim 1 or 2, characterized in that the arcing plates (2) are surrounded at their ends facing away from the contact points (4,5) by an insulation strip (7), which keeps the arcing plates (2) spaced apart and holds them together to form an assembly.

Images