JPH054769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switch that switches on and off current, and particularly to an arc extinguishing mechanism thereof.

The main applicable switches of the present invention include electromagnetic contactors and wiring breakers.

First, an example of a conventional electromagnetic contactor according to a prior proposal by the inventors will be explained with reference to FIG. 1st
In the figure, 1 is a mounting base made of plastic, 2 is a fixed core laminated with silicon steel plates on this mount, and 3 is a movable core installed opposite the fixed core 2 and also laminated with silicon steel plates. Reference numeral 4 denotes an operating coil that applies a driving force to attract the movable core 3 and the fixed core 2 against a tripping spring (not shown); 5 is a cross bar made of plastic and having a square window; Here, the movable iron core 3 is held. 6 is a movable contact inserted into the corner window of the cross bar 5 and held by a push spring 7; 6A is a movable contact provided on the movable contact 6;
Reference numeral 8 indicates a fixed contact that is provided opposite to the movable contact 6 and conducts current flow; 8A indicates a fixed contact provided on this fixed contact 8; and 8B indicates a terminal portion of this fixed contact 8. .

9 is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, 10 is a base on which the fixed contact 8 is attached, and 11 is a cover that covers the top surface of the electromagnetic contact, and inside it is a fixed contact 8A and a movable contact. A magnetic metal arc extinguishing plate 13 is provided to extinguish the arc 12 generated between the metal arc extinguishing plate 1
As is clear from FIG. 1, the movable contactors 3 and 3 are cumulatively arranged in parallel with and above the fixed contactor 8, facing the movable contactor and spaced apart from each other by a predetermined distance.

Since it has the above configuration, when the operating coil 4 is demagnetized in this electromagnetic contactor, the movable core 3 is separated from the fixed core 2 by a tripping spring (not shown), and the crossbar 5 also assumes the state shown in FIG.
The fixed contact 8A and the movable contact 6A are opened and an arc 12 is generated between the fixed contact 8A and the movable contact 6A, but this arc 12 is attracted to the metal arc extinguishing plate 13 as shown in FIG. The arc 12A is elongated as shown in FIG. The current is then cut off.

However, in such an arc extinguishing operation of the arc 12, the arc extinguishing plates 13a and 13b of the metal arc extinguishing plates 13 provided to improve the cutting performance do not contribute at all to the arc extinguishing operation, and the It had the disadvantage of poor cutting performance.

In addition, in order to eliminate this drawback, we
As shown in Japanese Patent No. 127323, it is also possible to provide an arc horn that is inclined and extended from the movable contact toward the metal arc-extinguishing plate, but in this case, the arc formed between the contacts and the metal arc-extinguishing plate As a result, the arc is difficult to be attracted to the metal arc-extinguishing plate, and sufficient cutting performance cannot be obtained.

The present invention has been made to solve the above-mentioned drawbacks, and includes a fixed contact joined to a fixed contact, a movable contact opposite the fixed contact and joined to a movable contact, and a movable contact parallel to the fixed contact. In a switch equipped with a plurality of metal arc-extinguishing plates stacked in parallel at a predetermined distance from each other, the tip of the movable contact is opposed to each of the metal arc-extinguishing plates, and the arc horn is set at right angles to the movable contact. It is characterized by being erected in a shape.

Hereinafter, the present invention will be described based on the embodiment shown in FIGS. 3 to 6, with the same or corresponding parts being designated by the same reference numerals. An arc runner 14 bent into a shape is electrically connected and installed as shown in FIG. 6 is formed so that it can pass through and come into contact with the fixed contact 8A. Further, at the tip of the movable contactor 6, as shown in FIG. distance L
are placed facing each other with a distance between them. This distance L must be at least 3 mm or more, and if the distance is less than 3 mm, the arc will remain stuck between the tip of the movable contact 6 and the metal arc extinguishing plate 13 closest to it. It has been confirmed through experiments that the shearing performance is poor.

However, the arc extinguishing operation of the arc extinguishing function having the above configuration will be explained based on FIG. The arc 12 is attracted to the magnetic metal arc-extinguishing plate 13 and stretched to become an arc 12A. At this time, since the arc runner 14 is provided at a higher position than the surface of the fixed contact 8, the lower leg of the arc 12 on the fixed contact 8A is easily transferred to the arc runner 14 and becomes an arc 12A. When the lower leg of the arm 12 is transferred to the arc runner 14, a current flows in the arc runner 14 to the right in FIG. 4, causing an arc 12A.
It is then driven toward the terminal portion 8B side of the fixed contact. As a result, the upper leg of the arc 12A is transferred from the movable contact 6A to the tip of the movable contact 6, and is drawn into the metal arc extinguishing plate 13, and the lower leg is transferred to the metal arc extinguishing plate 13. 13c or 1
3e and runs on the arc runner 14.
Next, the arc 12 moved to this movable contact 6
The upper leg of B is driven by the metal extinction plate 13 and is also driven upward by the magnetic field created by the current flowing through the arc runner 14, and is transferred from the fixed contact 6 to the arc horn 6B, and further the arc horn 6B, reaches the upper end of the arc horn 6B, and extends from the upper end of the arc horn 6B through the metal extinction plate 13 like an arc 12C.
Since the arc is extinguished through all of the metal arc extinguishing plates 13a to 13e, extremely excellent shear cutting performance can be obtained.

Moreover, since the arc horn 6B is arranged upright at right angles to the movable contact 6, the contacts 6A, 8
It becomes possible to reduce the distance between the arc 12 generated between A and the metal extinction plate 13, and the arc 12
can be easily attracted to the metal extinction plate 13, and as a result, it is possible to provide a switch with excellent shearing performance.

Next, the second embodiment will be explained based on FIG.
3 is applied, and the generated arc 12 is driven by the magnetic field created by the current flowing through the fixed contact 8 as shown by the arrow in Figure 5, so the lower leg of the arc 12 is connected to the fixed contact 8A. It can be easily transferred to the fixed contact 8, reducing wear and tear on the fixed contact 8A, and since the arc 12 is driven strongly, the arc time is shortened and the shearing performance is greatly improved. becomes.

Further, a third embodiment is shown in FIG. 6, which is the same as the above embodiment except that the metal extinction plate 13 is modified. According to the figure, metal extinction plate 1
3 is each extinction plate 13a to 13e constituting it.
A notch 15 is provided on the side facing the movable contact 6 and is formed in a U-shape, and is configured to surround the movable contact 6 on three sides. And the innermost part 15a of the notch 15 of each of the extinction plates 13a to 13e.
The distance L between the movable contactor 6 and the tip end of the movable contact 6 is 3 mm or more.

Even with such a metal extinction plate 13, good current shedding performance can be obtained as in each of the above embodiments.

Furthermore, FIG. 7 shows a wiring breaker to which the same erasing function as in the second embodiment is applied, and in the figure,
16 indicates a rotation axis, and the movable contact 6 is connected to the rotation axis 16.
The contact points 6A and 8A are opened and closed by rotating around the center. It goes without saying that even in this case, the same effects as those of the above embodiments can be achieved.

In addition, the switch having an isolation chamber according to the present invention is
Disappearance plates 13a to 1 constituting the metal dissipation plate 13
By increasing or decreasing the number of 3e sheets in the vertical direction,
The switch can be made compatible with the required voltage. Therefore, even a switch applied to high voltage can be configured with the same installation area as a switch with a lower voltage. It can be demonstrated.

In addition, in the above explanation, we have explained the switch that opens and closes the contact using a magnet, that is, the switch that is applied to the electromagnetic contactor and the wiring switch and disconnector, but the same can be applied to other switches as well. It's obvious.

As described above, according to the present invention, a switch with excellent shearing performance can be obtained by erecting the arcing horn at right angles to the tip of the movable contact.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a conventional switch, FIG. 2 is an explanatory diagram of the extinguishing operation of the switch shown in FIG. Fig. 4 is an explanatory diagram of the extinguishing operation of the embodiment of the present invention, Fig. 5 is an enlarged view of main parts showing an embodiment in which the arcing horn of the present invention is applied to another fixed contact, and Fig. 6 is an explanatory diagram of the extinguishing operation of the embodiment of the present invention. FIG. 7 is an enlarged view of the main parts when the metal extinction plate according to another embodiment is applied, and FIG. 7 is an enlarged view of the main parts when the extinction chamber of FIG. 5 is applied to a wiring or disconnecting device. 6...Movable contact, 6A...Movable contact, 6B...
...Arc horn, 8...Fixed contact, 8A...Fixed contact, 13...Metal extinction plate, 13a to 13f...
...Disappearance plate, 14...Arc runner, L...Separation distance.

Claims (1)

[Claims] 1. A fixed contact joined to a fixed contact, a movable contact facing the fixed contact and joined to a movable contact, and a movable contact provided parallel to the fixed contact at a predetermined distance from each other. A metal arc-extinguishing plate made of a plurality of magnetic materials arranged in parallel with each other separated from each other; A switch characterized by having arcing horns arranged opposite to each other. 2. The switch according to claim 1, wherein the distance between the arc horn and the metal arc-extinguishing plate is at least 3 mm. 3. Claim 1 or 3, characterized in that the fixed contact has an inverted L-shaped arc runner at its tip, and a notch is provided in the bent portion of the arc runner to allow the passage of the movable contact. The switch described in Section 2. 4. The switch according to claim 1 or 2, wherein the fixed contact is formed in a U-shape.