JPS6138565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arc extinguishing device, and by improving the arc extinguishing plate constituting the arc extinguishing device, the entire length of the arc can be extended compared to the conventional one, and the arc extinguishing chamber can be made smaller. This made it possible to do so.

FIG. 1 shows an example of a conventional arc extinguishing device. 1 is a fixed contact of a switch, 2 is a movable contact, and 3 is an arc horn. One end of this arc horn 3 is connected to both the contacts 1 and 2. An arc extinguishing chamber 4 is formed adjacent to the other end, and a plurality of arc extinguishing plates 5 are arranged within this arc extinguishing chamber 4 at required intervals. Each arc extinguishing plate 5 is
Depending on the required function, it is made of insulating material, magnetic material, or conductive material in the shape of a rectangular plate as shown in Fig. A triangular notch 6 is formed.

In the arc extinguishing device having such a configuration, when an arc A is generated between the two contacts 1 and 2, this arc is commutated between the shortest gap of the arc horn 3,
It further travels over the arc horn 3 and reaches the end of each arc extinguishing plate 5 (see A' in Fig. 1), and the arc extinguishing plate 5
The arc is extinguished by suction between the two.

At this time, as a function of the arc extinguishing plate (grid),
A function to attract the arc between each arc extinguishing plate, a function to extend the arc to reduce its conductance and increase the arc voltage, a function to divide the arc into short gap series arcs to form an arc spot, and stabilize the arc voltage. Furthermore, the arc is required to be cooled by vapor generated when the arc comes into contact with the arc-extinguishing plate. When the arc extinguishing plate 5 is made of a magnetic material such as iron, it has a function of attracting the arc, and when it is made of an insulating material such as fiber, it has a function of increasing arc voltage, and when it is made of a conductive material such as copper. It has been found that the function of stabilizing the arc voltage is sometimes performed better than with other materials. Also,
As shown in FIG. 2, when the arc-extinguishing plate is made of a magnetic material and the notches 6 are formed, the arc can be attracted even better. This is because when the concentric lines of magnetic force formed by the arc reach a portion with different magnetic permeability, the lines of magnetic force are distorted and are attracted toward the arc-extinguishing plate 5 .

However, among the functions required of the arc-extinguishing plate, especially the function of extending the arc and increasing the arc voltage, even if each of the arc-extinguishing plates 5 of the above-mentioned conventional device is entirely composed of an insulating material, It was not possible to extend the arc sufficiently between each arc extinguishing plate, and as a result, in order to extend the arc sufficiently, a large number of arc extinguishing plates were required and a large arc extinguishing chamber was required. .

In view of these drawbacks, the present invention provides an arc extinguishing device that can significantly extend the arc between each arc extinguishing plate.

The present invention will be described below with reference to the illustrated embodiments.
In FIG. 3, 7 is a rectangular flat arc-extinguishing plate made of magnetic material such as iron, and 8 and 9 are covering members made of insulating material. A triangular notch 10 is formed on each end face on the arc generation side, and the external dimensions are made the same so that they can overlap each other. A groove 11 is formed in the arc extinguishing plate 7 from the end surface opposite to the end surface on the arc generation side toward the end surface on the arc generation side, and on the other hand, a groove 11 is formed in each of the covering members 8 and 9 from the center to one side. A hole 12 is bored. The arc-extinguishing plate 7 and the covering members 8 and 9 are superimposed and connected to each other with the arc-extinguishing plate 7 in the center, and at this time, as shown in FIG. Hole 12 is groove 1
1, and further insulates the notch 10 of the arc-extinguishing plate 7.

The composite arc-extinguishing plate 13 integrally constructed from the arc-extinguishing plate 7 and the covering members 8 and 9 is shown in FIGS.
As shown in the figure, a plurality of lamps are disposed within the arc extinguishing chamber 4 at required intervals, similar to the conventional device.

When an arc is generated between the contacts 1 and 2 in this state, this arc is diverted between the shortest gap of the arc horn 3 as in the conventional case, and further travels on the arc horn 3 between the arc extinguishing plates 13. is attracted to. The arc attracted between each arc extinguishing plate 13 forms a spot in the through hole 12 of the covering members 8 and 9, and
A short gap series arc B as shown in the figure is formed. In FIG. 5, the arc B is shown by a solid line, and the current bus in the arc-extinguishing plate 13 is shown by a broken line. Due to the characteristic that the short gap series arcs B with spots formed in this way are biased in the direction of the magnetic material of the arc, each adjacent arc extinguishing plate 1
3 (directions F and F' in Figure 5). On the other hand, since the arc-extinguishing plate 7 has grooves 11, the current in the arc-extinguishing plate 7 bypasses the grooves 11 and flows forming a loop C shown by the broken line in FIG. The loop drives the arc upward. As a result, the arc B spreads in a loop between the arc-extinguishing plates 13 due to the combination of these forces, and the positive column is extended (FIG. 6).

In addition, in this embodiment, the arc-extinguishing plate 7 and the covering members 8 and 9
Although the arc-extinguishing plate is constructed as a separate body, the covering member may be formed by coating the arc-extinguishing plate with an insulating material.

As described above, the present invention has the above configuration,
Furthermore, since each arc-extinguishing plate is made of a magnetic material and has triangular notches, it is able to attract arcs well.Also, since the covering member covering the arc-extinguishing plate is made of an insulating material, the arc voltage can be reduced. Furthermore, since the arc spreads in a loop between adjacent arc-extinguishing plates, the arc can be sufficiently extended with fewer arc-extinguishing plates than in the past, reducing the space in the arc-extinguishing chamber. be able to. In addition, since the through holes of each covering member are arranged at symmetrical positions across the grooves, the point at which the arc becomes a loop becomes earlier, improving the rate of increase in arc current and increasing the current limiting effect. It has the effect of becoming.

Furthermore, since the arc-extinguishing plate and the covering member have a simple shape and have the same external dimensions, they are easy to manufacture.
Moreover, there is an effect that they can be easily polymerized and integrated with each other.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an example of a conventional device, FIG. 2 is an enlarged front view of the arc extinguishing plate shown in FIG. 1, FIGS. 3 to 6 show an embodiment of the present invention, and FIG. Figures a, b, and c are front views of the covering member on one side, the arc-extinguishing plate, and the covering member on the other side, respectively. 5 and 6 are a side view and a perspective view, respectively, showing the state of the arc. 7... Arc-extinguishing plate, 8, 9... Covering member, 11...
Groove, 12...through hole.

Claims (1)

[Claims] 1. In an arc extinguishing device equipped with a plurality of arc extinguishing plates arranged one after another at required intervals, the arc generated on one side of these arc extinguishing plates is suctioned and extinguished by the arc extinguishing plate. The arc-extinguishing plate is made of a magnetic material, and its front and back surfaces are covered with a covering member made of an insulating material, and the arc-extinguishing plate is provided with grooves extending from the end surface opposite to the end surface on the arc generation side toward the end surface on the arc generation side. The covering member covering the surface of the arc-extinguishing plate has a through hole exposing the surface of the arc-extinguishing plate on one side of the groove, and the covering member covering the back side of the arc-extinguishing plate has a through hole on the other side of the groove. Through-holes are formed to expose the back surface of the arc-extinguishing plate, and the through-holes are arranged at symmetrical positions across the groove, and triangular holes are formed on the end faces of the arc-generating side of the arc-extinguishing plate and the covering member, respectively. 1. An arc extinguishing device characterized in that an arc extinguishing plate and a covering member are integrally integrated with each other by forming a cut in the shape and making the external dimensions of the arc extinguishing plate and the covering member equal.