JPS5826434A - Arc extinguishing chamber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arc extinguishing chamber of a circuit breaker that includes one fixed contact and a plurality of arc extinguishing plates made of electroconductive material.

For example, in the arc extinguishing chamber of a circuit breaker such as a circuit breaker for low-voltage wiring, the space between the electrodes (11) is
In order to cut off the current by cooling and deionizing the J, energy is taken away from the arc.

For example, one effective arc extinguishing method used in low I+L and disconnection is cooling and splitting the arc with arc extinguishing plates.

However, the arc-extinguishing plate can maintain its arc-extinguishing effect only by contact with the arc, which requires a force acting on the arc. For this purpose, the arc-extinguishing plate is made of a magnetically conductive material, such as iron or a ferrous alloy, which becomes magnetized in a magnetic field.

Due to the action of the magnetic field caused by the arc-extinguishing plate, a. At least partially conductive non-magnetic material such as *tM, copper or '
Arc extinguishing plates made of aluminum and having six parts of ferromagnetic material, for example with a non-magnetic metal lining or a non-magnetic metal coating, are known.

The overall object of the present invention is to improve the arc-extinguishing chamber 'e% of this trap, which has an arc-extinguishing plate made of an electrically conductive material, so as to improve its breaking ability.

This object is based on the present invention, wherein the fixed contact includes a non-magnetic arcing horn, the arcing horn is electrically conductively connected to the contact point of the fixed contact, and is not connected to other parts of the fixed contact. This is achieved by providing at least partial insulation. The arc horn ensures that the arc driving force is not unacceptably weakened and that the high restabilization voltage characteristic of the arc horn material is maintained to ensure reliable partial arc formation. Preferably, at least a portion of this terminal horn is made of brass and surrounds a portion of the contact.

In one advantageous embodiment of the arc extinguishing chamber, a 21 arc extinguishing plate consisting of an electroconductive plate and a conductive non-conductive plate is placed opposite the arc horn. It is preferable that the surface of this double arc-extinguishing plate made of non-(rH magnetic plate) faces the 7-coupon.With this configuration of the arc-extinguishing plate, the 1-ferromagnetization property, that is, the arc driving and holding effect, is not weakened. The restabilization voltage increases.

It is best to provide the fixed contact with a slit extending in the current direction.1. By doing this, the current is divided and led from the contact point VCfl11 of the contact. This current component weakens the magnetic effect in the opposite direction to the driving force of the arc extinguishing plate.
, the arc is assisted by the magnetic force of the arc-extinguishing plate.

and pull it in between the arc-extinguishing plates.

Next, an embodiment of an arc extinguishing chamber according to the present invention is shown in detail in the drawings. -ml clear.

FIG. 1 is a longitudinal sectional view of the arc extinguishing chamber. In the drawing, a fixed contact 2 having a contact 4 and preferably having a slit 6 in the current direction is arranged in an arc extinguishing chamber 8. The arc extinguishing chamber 8 further includes a movable contactor 16 having a contact point 18, and an arc that is generated after the contacts 2 and 16 are separated along the moving plane of the movable contactor, but is orthogonal to an arc not shown. A plurality of arc extinguishing plates 24, 26, 28, 30, 32 arranged insulatingly
, 34°36.38, 40, 42, 44.46. The fixed contact 2 comprises an arcing horn 10 which is electrically conductively connected to the contact 4 and at least partially insulated from the rest of the fixed contact.

The arcing horn 10 preferably consists of at least one part of brass or six parts of brass plated or brass-clad iron. After contacts 2 and 16 are separated, an arc is formed between contacts 4 and 18.

The arc is attracted by the magnetic field of the arc-extinguishing plate, and the n% arc foot point moves from the contact point 4 to the termination horn 10. Since the arc load is large near the cathode of the contact 4, it is preferable to arrange a double arc extinguishing plate 24 consisting of a conductive electromagnetic plate 22 and a conductive non-magnetic plate 20 above the arc horn 10. The low boiling risk, sublimation point or atomization point of the conductive non-magnetic material of the arc horn 10 and the plate 20 provides a high restabilizing voltage fl, thereby improving the arc extinguishing action of the arc extinguishing chamber 8.

FIG. 2 is a perspective view of the fixed contact. A slit 6 is provided in the fixed contact 2 and extends in the current direction.

Due to this shape, the current is guided from the side to the contact point of the contact 4, so that the arc is transferred to the arc horn 10 by the magnetic force of the current-carrying path connected to the ring, and is then transferred to the arc extinguishing chamber by the magnetic force of the arc extinguishing plate. Pull inside! to snatch Arc horn 10 is the l
The ends may be provided with two projections 12.14 forming a slit between them. By means of this projection 12.14, the arcing horn 10 surrounds a portion of the contact 4 and is electrically connected to the horn. The arcing horn 10 is at least partially insulated from the rest of the fixed contact 2. This shape of the arc horn 10 strengthens the magnetic force in the annular passage.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an arc extinguishing chamber showing one embodiment of the present invention, and FIG. 2 is a perspective view of a fixed contact. In the drawing, 2 is a fixed contact and 4 is a contact. 6 is the slit%, 8 is the arc extinguishing chamber, and 10 is the arc horn. 20 is a conductive non-magnetic plate, 22 is a conductive electromagnetic plate, 24°26.
28, 30, 32, 34, 36, 38, 40, 42, 4
4°46 is an arc extinguishing plate. = 7-

Claims (1)

[Claims] 1) In an arc extinguishing chamber of a breaker including one fixed contact and a plurality of arc extinguishing plates made of an electromagnetic conductive material, the fixed contact includes a nonmagnetic arc horn. An arc extinguishing chamber characterized in that the arc horn is electrically conductively connected to a contact of the fixed contact and is at least partially insulated from other parts of the fixed contact. 2. The arc extinguishing chamber according to claim 1, characterized in that the end horn surrounds a part of the contact area. 3) In the arc extinguishing chamber according to claim 1 or 2, the double arc extinguishing member consisting of an electroconductive plate and a conductive nonmagnetic plate is at least close to and parallel to the arc horn. An arc extinguishing chamber characterized in that it is provided with an arc extinguishing chamber. 4) The arc extinguishing chamber according to claim 3, characterized in that the conductive nonmagnetic plate is disposed facing the arc horn. 5) The arc extinguishing chamber according to claim 1, characterized in that the fixed contact has a sulin extending in the direction of current flow. 6) The arc extinguishing chamber according to claim 1, wherein the fixed contact is at least partially made of brass.