JPS6149346A - Switch - 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 [Technical Field of the Invention] The present invention relates to a switch, and more specifically, at least a pair of contacts.

This invention relates to a switch that is housed in an enclosure made of an insulator together with an arc extinguishing plate that cools the arc, and has an arc runner attached to a fixed contact.

[Conventional technology]

FIGS. 1 and 2 show a conventional switch of this type, in which a fixed electrode 3 and a movable contact 6u are respectively attached to a fixed electrode 1 and a movable contact 6u which are piped opposite each other. It constitutes a contactor. An arc-extinguishing plate 6 is disposed in the operating mechanism section j' to which the proximal end of the movable member is connected. The enclosure 7 is made of an insulator and houses the operating parts of the switch.

The enclosure 7 is provided with an arc or hot gas outlet. An arc runner is attached to the fixed electrode.

With the above configuration, when the movable contact contacts the fixed contact J, the Pg force is transferred from the power supply to the fixed type.

Pole / → Fixed contact 3 → Movable contact ≠ → Via movable electrode,
Supplied to the load side. In this state, the return mechanism operates to separate the movable contact G from the fixed contact J so that a large current such as a short circuit current flows between the contacts. At this time,
An arc is generated between the fixed contact 3 and the movable contact DA, and an arc voltage is generated between the fixed contact J and the movable contact Hiroma. This arc voltage is.

It rises as the separation distance of the movable contact q from the fixed contact 3 increases. At the same time, the arc A is drawn toward the arc-extinguishing plate 6 by the magnetic force and expands, so that the arc voltage further increases. Then, when the arc current reaches the zero flow point, the arc A is extinguished and the current is cut off.

Considering the above operation in more detail, the movable electrode
As shown in FIG. 7, the electrode is opened by one rotation operation. In this electrode opening operation, the spatial distance between the movable electrode and the fixed pole is the distance between the abdominal core a of the movable electrode and the tip l of the fixed electrode.
The distance between a is short. On the other hand, the arc generated between the movable contact V and the fixed contact 3 receives an electromagnetic force from the current flowing through the fixed electrode / and the current flowing through the movable electrode Y, and receives a force in the direction of the resultant force. However, this electromagnetic force is relatively small because the ionization structure is such that the current flows in a straight line when the ionization structure is closed. Accordingly, it moves from a position between the movable contact point Hiroshi and the fixed contact point 3 to a position a short distance between the movable electrode second abdomen Xa and the tip end part /a of the fixed electrode /, and stays there. Therefore, in Figure 1, the contact points, 7. There was a problem with the arc-extinguishing plate located to the right of lI.

In addition, even if the distance between the abdominal part a and the tip part la is not particularly short as described above, there are many structures in which the distance between the fixed contact 3 and the movable contact part is short, and in this case, the arc The arc stagnates at contact J, Hiroma6.Thus, even though the arc is cooled by the arc extinguishing plate 6, the stagnation of the arc on the contact accelerates contact wear, which is a serious problem when it comes to upgrading the breaking capacity of the switch. It was causing trouble.

In order to solve the above problems, the present inventors proposed a single fixed contact as shown in Fig. 1. In other words, the arc runner 5, which has a roughly horizontal U-shape and a notch groove 9c formed in the center, is fixed to the fixed electrode //, and the fixed contact 3 attached to the fixed electrode is cut out. It faces groove /9c.

The operation of this configuration will be explained with reference to FIGS. 5 to 7. Figure 5 shows when the electrode is closed, and the movable contact 4/'
The tip end part 2a of the movable electrode 1 to which 1 is attached extends beyond the position of the movable contact 1 to form an arc horn, and a part of the tip part 2a is attached to the arc runner. Facing the notch/Yc. FIG. 6 shows the initial state of the concave plate during the current interrupting operation, and the arc A generated between the fixed contact /3 and the movable contact /4' upon opening is stuck at this position for a while. As the opening progresses, the arc runner /? When the distance between a part of the movable electrode and the tip of the movable electrode l becomes shorter.

As shown in Figure 7, arc A immediately moves to contact point /3°7.
4 to between the arc runner end and the tip end/251. At this time, the tip part /2a acts as an arc horn, and the arc A becomes a dog at a distance from the movable contact point/Hiroshi due to the transfer, so that wear and tear on the movable contact point F is significantly reduced. Further, since the arc A is strongly pressed against the arc-extinguishing plate on the right side of the contact and is cooled, the current interrupting performance is also improved.

[Summary of the invention]

This invention improves current interrupting performance and reduces contact wear using an arc runner with a notched groove in the center.
with the aim of further improvement.

To provide a switch which can significantly accelerate the transition of an arc to an arc runner by bending the end of the arc runner far from a fixed contact to the side opposite to the fixed electrode side and bringing it close to an arc extinguishing plate.

[Embodiments of the invention]

Figures 1 to 1 show an embodiment of the present invention.

Figures 5 to 7 showing fixed electrodes with arc runners attached.
In the figure, an arc runner /? is attached to a fixed electrode // with a fixed contact /J. is horizontally U-shaped,
A notch groove/9c is formed in the center. Then,
An arc transition portion 21 is formed by bending the end of the arc runner /9 far from the fixed contact iJ to the side opposite to the fixed electrode // side.

The fixed electrode /l having such a configuration is arranged in combination with a movable electrode /2 and an arc-extinguishing plate /6 to which a movable contact /% is attached, as shown in Fig. 1. That is, when the electrodes shown in FIG. It faces the notch groove/9C. Arc-extinguishing plates 1 arranged in parallel
6 has horseshoe-shaped grooves/6a formed therein.

They face each other and have the role of bringing the Na/Wa substantially closer to the arc-extinguishing plate/6 side. The rest of the configuration is the same as the conventional one.

Next, we will discuss the operation. An arc generated between the movable contact / 2 and the fixed contact / 3 due to the opening operation caused by the rotation of the movable electrode 12 releases conductive high temperature gas into the surrounding space. This high-temperature gas moves to the tip of the movable 'Fn pole/2.
Core a and arc runner? As shown in FIG. 72, when the arc A is filled, the arc
Transferred between Yua and Arclinata.

Next, as shown in FIG. 13, as the opening progresses further over an hour, arc A becomes an arc runner? Although one leg is on the top, the distance between the arc transition part and the lowest arc extinguishing plate/6 is small.

Dielectric breakdown occurs at this short distance portion, and the arc A forms a series arc spot between the arc extinguishing plate /6 and the arc transition portion 2/ as shown in FIG. It is generally known that such series arc spots are an important element in ensuring the arc extinguishing ability at the t-flow zero point of the arc.

Therefore, as a result of the above-described operation, the current interrupting performance is improved and, in addition, wear and tear on the contacts is significantly reduced.

FIG. 1 shows another embodiment in which the width of the arc transition portion U/a is smaller than the width of the arc runner 9.

Arc runner/? An arc transition portion, 2/a, is formed at the center of the width of the arc.

With such a configuration, the legs of the arc are connected to the arc transition part
It is ensured that the position when moving to is always at the center of the width of the arc runner 12, which is effective in preventing burnout of the wall surface of the enclosure.

Note that it goes without saying that the number of contacts is not limited to one pair, but may be a plurality of pairs.

〔Effect of the invention〕

This invention has a simple configuration in which the arc runner's end is bent to form an arc transition section.

This not only improves the flow rate and breaking performance, but also significantly reduces the wear and tear on the contacts, allowing for an increase in breaking capacity without any problems.

[Brief explanation of drawings]

Figures 1 to 7 show conventional switches, Figure 1 is a partially sectional plan view, Figure 2 is a sectional view taken along the line nn in Figure 1, and Figure 3 is a cross-sectional view taken along the line nn in Figure 1. Figure 3 is a partial perspective view, and Figures 3 to 7 are side views of essential parts, respectively, showing the operating state. Figures 1 to 1J show an embodiment of the present invention. Fig. g is a partial side view, Fig. D is a partial plan view, Fig. 10 is a partial perspective view, Fig. 1/Fig. FIG. 3 is a side view of main parts showing the state. 1st. FIG. F is a partial perspective view of another embodiment. ri;・enveloping body, //・・fixed electrode, /yu・・movable electrode,
/j...Fixed contact, lψ...Movable contact. /6... Arc extinguishing plate, /6a... Horseshoe groove, /7... Arc runner, /9c... Notch groove 1.2/, 2/a-... Arc transition part. In each figure, the same reference numerals indicate the same or half parts. Agent Zeng Wa Dao Teruji 5 Figure 11 Figure 1J Figure 12 and 13] J Flame Figure 14

Claims (2)

[Claims] (1) A contactor consisting of a fixed electrode and a rotatable movable electrode,
A plurality of arc extinguishing plates each having a horseshoe-shaped groove formed therein, an arc runner having a cutout groove formed in the center and attached to the fixed electrode, and an end of the arc runner farthest from the fixed contact being placed on the side opposite to the fixed electrode side. An arc transition part formed by bending the switch. (2) The switch according to claim 1, further comprising an arc transition portion formed at the center of the width of the arc runner and having a width smaller than the width of the arc runner.