JPH0447926B2 - - 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. , 4 is an operating coil that applies a driving force to attract the movable core 3 and fixed core 2 against a tripping spring (not shown); 5 is a crossbar made of plastic and has a square window; A movable iron core 3 is held at the lower end. 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 which is provided opposite to the movable contact 6 and conducts current flow, 8A is a fixed contact provided with this fixed contact 8, and 8B is 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 that occurs between the 6A and the 6A, and as is clear from FIG. They are cumulatively arranged parallel to and above the contactor 8 and spaced apart from each other by a predetermined distance.

With 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.

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 cumulatively arranged in parallel at a predetermined interval from each other, an arc horn is erected at the tip of a movable contact facing each of the metal arc-extinguishing plates, and
A commutator plate having an insertion hole through which the arc horn is inserted is arranged above the movable contact, and an extended end of the commutator plate is opposed to the metal arc-extinguishing plate. It is something.

Hereinafter, the present invention will be explained based on the embodiments shown in FIGS. 3 to 7, 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. Further, above the movable contactor 6, a commutation plate 16 shown in FIG. 4 is provided. An insertion hole 16A for the arc horn 6B is formed at both ends of the commutation plate 16, and the arc horn 6B is inserted into the insertion hole 16A.
They are arranged in parallel as shown in the figure. And commutation plate 1
The end portion of the metal arc-extinguishing plate 13 is extended to be located above the arc-extinguishing plate 13a accumulated at the top of the metal arc-extinguishing plate 13.

Note that the distance L must be at least 3 mm or more, and if the distance is less than 3 mm, the arc will stick 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 mechanism having the above configuration will be explained based on FIG. The arc 12A is attracted by the metal arc extinguishing plate 13 made of a magnetic material, and is elongated. 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 arc 12 is transferred to the arc runner 14, a current flows through the arc runner 14 in the direction of the arrow in FIG.
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 arc extinguishing plate of the metal arc extinguishing plate 13. 13c or 1
3e and runs on the arc runner 14.
Next, the arc 12 transferred to this movable contact 6
The upper leg of B is driven by the metal arc-extinguishing 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 It travels above the arc horn 6B and reaches the upper end of the arc horn 6B. Then, the arc 12 is extended from the upper end of the arc horn 6B through the metal arc extinguishing plate 13.
C is the arc-extinguishing plate 13a to 13e of the metal arc-extinguishing plate 13
It reaches the arc runner 14 via all of the above. At this time, the upper leg of the arc 12C is the arc horn 6
Commutation plate 1 inserted into B and arranged in parallel with the movable contact 6
The arc runner 14 is transferred to the peripheral edge of the insertion hole 16A of No. 6, and then travels to the outside of the commutation plate 16 (to the right in the figure), passing through all the arc extinguishing plates 13a to 13e that constitute the metal arc extinguishing plate 13, and the arc runner 14. It becomes a connecting arc 12D and is extinguished. However, by providing the commutation plate 16, the arc is not extinguished at the tip of the arc horn 6B side of the arc extinguishing plate 13a, and the metal arc extinguishing plate 13a
The arc is extinguished by the flat portions of these arc-extinguishing plates via the arc-extinguishing plates 13e and extremely excellent arc cutting performance can be obtained. Therefore, the arc extinguishing between the arc extinguishing plate 13a and the arc horn 6B, which occurs when there is no commutation plate 16, can be avoided, so that the electric field concentration at the end of the arc extinguishing plate 13a,
As a result, it is possible to avoid a rise in temperature and prevent a decrease in shearing performance.

Further, the second embodiment will be explained based on FIG. 6. This embodiment shows an example in which the fixed contact 8 is U-shaped and the arc runner 14 is integrally formed. is driven by the magnetic field created by the current flowing through the fixed contact 8 (indicated by the arrow in FIG. 6), so the lower leg of the arc 12 can easily transfer from the fixed contact 8A to the fixed contact 8. The consumption of the fixed contact 8A is reduced, and
Since the arc 12 is driven strongly, the arc time is shortened and the shearing performance is greatly improved.

Further, a third embodiment is shown in FIG. 7, which is the same as the above embodiment except that the metal arc-extinguishing plate 13 is modified. According to the figure, the metal arc-extinguishing plate 13 has each arc-extinguishing plate 13a to 13 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 15 of the notch 15 of each arc extinguishing plate 13a to 13e
The distance L between a and the tip of the movable contact 6 is 3 mm or more.

Even with such a metal arc-extinguishing plate 13, good current cutting performance can be obtained as in each of the above embodiments.

Furthermore, FIG. 8 shows an arc extinguishing mechanism similar to that of the first embodiment applied to a wiring cutter, and in the figure,
Reference numeral 17 indicates a rotating shaft, and reference numeral 18 indicates a stranded wire, through which the movable contactor 6 and the commutation plate 16 are electrically connected. 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 arc extinguishing chamber according to the present invention is
Arc-extinguishing plates 13a to 1 forming the metal arc-extinguishing 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 it can also be applied to other switches as well. It's obvious.

As described above, according to the present invention, by providing an arc horn and a commutation plate, a switch having excellent shear breaking performance can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a prior art switch; FIG.
The figure is an explanatory diagram of the arc extinguishing operation of the one in Figure 1, Figure 3 is an enlarged view of the main part of the fixed contact to which the arc runner according to the present invention is applied, and Figure 4 is a perspective view of the commutator plate according to the embodiment of the present invention. , Fig. 5 is an explanatory diagram of the arc extinguishing operation of an embodiment in which the commutation plate according to the present invention is applied, and Fig. 6 is an enlarged view of the main part in which the commutation plate according to the present invention is applied to another fixed contact of the present invention. FIG. 7 is an enlarged view of the main part to which a metal arc-extinguishing plate according to still another embodiment of the present invention is applied, and FIG.
The figure is an enlarged view of the main parts when the arc extinguishing chamber of FIG. 5 is applied to a wiring or disconnection switch. 6...Movable contact, 6A...Movable contact, 6B...
...Arc horn, 8...Fixed contact, 8A...Fixed contact, 13...Metal arc extinguishing plate, 13a to 13f...
... Arc extinguishing plate, 14 ... Arc runner, 16 ... Commutation plate, 16A ... Insertion hole, 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, an arc runner formed extending from the fixed contact, A metal arc-extinguishing plate is provided facing the arc runner and is composed of a plurality of arc-extinguishing plates arranged in parallel at a predetermined distance from each other; A commutator plate is provided above the movable contact and has an insertion hole through which the arc horn is inserted, and an extended end of the commutator plate is connected to the metal arc extinguishing plate. A switch characterized in that the switches are arranged opposite to each other at a predetermined interval. 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. The switch according to claim 1 or 2, wherein the fixed contact and the arc runner are formed in a U-shape. 4. The switch according to any one of claims 1 to 3, characterized in that a notch for receiving a movable contact is formed on the arc horn side of the metal arc-extinguishing plate.