JPS5840509Y2 - Ingredients - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an arc extinguishing chamber that divides, cools, and extinguishes the arc generated when a contact of a circuit breaker or the like is opened.

Conventionally, a large number of magnetic plates having roughly triangular or ■-shaped notches on one edge are stacked at intervals, and the triangular notches are aligned in a line, and when the insides of these notches are opened, a movable magnetic plate is used. Arcing chambers through which the contacts are moved are used and are well known.

However, in this type of arc extinguishing chamber that does not have a blowout coil, the driving force of the arc is weak, so it is extremely difficult to interrupt the direct current that does not have a zero point. However, even in alternating current, it was unavoidable that the blocking performance was inferior.

This invention aims to eliminate the drawbacks such as sloping, and provides an arc extinguishing chamber with a simple structure and a blowout coil effective for driving the arc.

The invention will now be explained with reference to the illustrated embodiment.

As shown in FIG. 1, the fixed conductor 2 supporting the fixed contact 1 supports the magnetic plate 5 closest to the fixed contact, that is, the lowermost magnetic plate 5a, through the insulating plate 6, and forms a triangular shape. A large number of magnetic plates 5 having notches 8 on one end edge are stacked at regular intervals so that the notches 8 are lined up in a straight line, and the side edges are attached to an insulating fixed side plate (not shown) to simplify the drawing. is attached and supported to form an arc extinguishing chamber.

A movable contact 3 that comes into contact with and separates from the fixed contact 1 is supported at the tip of a movable conductor 4, and is arranged so as to perform a separating movement through linearly arranged notches 8.

In this invention, the blowout coil 7 is placed in the arc extinguishing chamber having the conventional structure as described above, and as shown in the figure, the blowout coil 7 is located on both sides of the group of magnetic plates 5, and in the illustrated example, Almost inverted U-shaped, with one end 7a fixed contact 1
The other end 7b is connected to the fixed conductor 2, and the other magnetic plates 5 are insulated by an insulating plate (not shown).

Describing the operation of the arc extinguishing chamber configured in this way, if the circuit breaker now starts to open its contacts 1 and 3 due to an overcurrent flowing, the contacts 1 and 3 will open.
The arc generated during this period is first transferred to the lowermost magnetic plate 5a, and the arc current flows through the blowout coil 7 to the fixed conductor 2 as shown by the arrow in FIG.

Next, as the movable contact is separated, the arc that is gradually transferred from the movable contact to the upper magnetic plates is broken by each magnetic plate 5 and continues to the lowest magnetic plate 5a, and passes through the blowout coil 7. The fixed conductor 2 is reached.

This aspect is as shown in FIG.

The magnetic field obtained by the current flowing through the blowout coil 7 has the effect of driving the arc connected to the magnetic plate and the movable contact and pushing it deep into the magnetic plate, so that the arc is finally cooled and extinguished.

Furthermore, as described above, the blowout coil 7 has one end connected to the lowermost magnetic plate 5a and the other end connected to the fixed conductor 2, so that the fixed contact 1 and the movable contact 3 are not separated from each other. It has a remarkable feature not found in conventional coils in that no current flows through the coil 7 when the coil 7 is in this state.

Therefore, it is possible to use a coil with a relatively small cross-sectional area, and it is economical because no power is consumed.

As described above, according to this invention, it is possible to quickly move the generated arc toward the magnetic plate, and the structure is also extremely simple, making it easy to manufacture.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the arc extinguishing chamber of this invention, and FIG. 2 is a side view of the arc extinguishing chamber of FIG. 1, explaining the operation. 1... Fixed contact, 2... Fixed conductor,
3...Movable contact, 4...Movable conductor,
5...Magnetic plate, 5a...Lowermost magnetic plate, 6...Insulating plate, 7...Blowout coil, 7a... One end, 7b...Other end, 8...triangular notch.

Claims (1)

[Scope of utility model registration request] In an arc extinguishing chamber having a notch for accommodating a contact at one end edge, and comprising a plurality of magnetic plates stacked and fixed at intervals so that the notches are arranged substantially in a straight line, one end has a fixed contact. The other ends of the conductors supporting the contactors are respectively connected to magnetic plates near the fixed contactors, and both liquid contactors are connected along the side edges of the plurality of magnetic plates in the direction in which the contacts are separated. An arc extinguishing chamber characterized in that a blowout coil is provided that extends to surround the chamber, so that an arc current flows when the contactor is opened.