JPS6149343A - 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 one pair of contacts.

Along with an arc-extinguishing plate with a horseshoe-shaped groove that cools the arc,
This invention relates to a switch that is housed in an enclosure made of 5-metal wire and has an arc runner attached to a fixed contact.

[Conventional technology]

Figures 1 and 2 show a conventional switch of this type, in which a fixed contact J and a movable contact H are respectively attached to a fixed electrode L and a movable contact L which are arranged opposite each other. It constitutes a contactor. The operating mechanism part jrK is a movable electrode.
An arc extinguishing plate 6 is provided for cooling the arc to which the base end of the arc 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 l.

With the above configuration, if the movable contact DA is now in contact with the fixed contact 3, the π force is from the power supply to the fixed electrode 1 → fixed contact J → movable contact GL → movable It is supplied to the load side via the electrode.

In this state, if a large current such as a short-circuit current flows through the early contact, the operating mechanism section 5 operates to separate the movable contact from the fixed contact J. At this time, as shown in Figure 3,
An arc occurs between the fixed contact 3 and the movable contact φ,
An arc voltage is applied between the fixed point 3 and the flexible contact point DA. This arc voltage increases as the separation distance of the movable contact μ from the fixed contact 3 increases. Also, at the same time,
Since the arc A is drawn toward the arc-extinguishing plate 6 by magnetic force and extends, the arc voltage further increases. Then,
When the arc current reaches the current black point, the arc A is extinguished and the current is cut off.

Considering the above operation in more detail, the movable electrode 2 rotates and opens. In this electrode opening operation, the spatial distance between the movable electrode A and the fixed electrode L is as short as the distance between the abdominal core A of the movable electrode A and the tip end 3 of the fixed electrode A. On the other hand, the arc A generated between the movable contact Hiroshi and the fixed contact 30 flows through the fixed electrode 1 J1. It receives an electromagnetic force from the current flowing through the movable electrode 2 and the current flowing through the movable electrode 5, and receives a force in the direction of the resultant force.

However, this electromagnetic force is relatively small because the electrode structure allows current to flow linearly when closed.

Therefore, in general, the arc A moves from the position between the movable contact DA and the fixed contact J with the opening operation of the movable electrode 2.
Abdominal core a of T-dynamic electrode and fixation'/tip of IL segment l/a
It moves to a position a short distance between 1-1 and stops there. Therefore, contact point 3. There was a problem in that the arc A did not touch the arc extinguishing plate B located on the right side of the arc q, and the arc A was not cooled, making it impossible to obtain the desired interrupting performance.

In addition, even if the distance between the holding abdomen part a and the tip part/a is not 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, Arc A stays between contacts J and F. Thus, even though the arc A was cooled by the arc extinguishing plate 6, contact wear was accelerated due to stagnation of the arc on the contact, causing a serious problem in upgrading the breaking capacity of the switch.

In order to solve the above problems, one of the inventors, Ryo, proposed a fixed contactor as shown in FIG. That is, an arc runner /9 having a horizontal U-shape and a notched groove /VC formed in the center is fixed to a fixed electrode 1, a fixed electrode //
A fixed contact /J attached to the notch groove /9c is positioned facing the notch groove /9c.

The operation of such a configuration is shown in Figures 7-7ii! 2]
This is explained by: Figure 5 shows the electrode when it is closed, and the tip of the movable electrode /J to which the movable contact lt/ is attached is extended beyond the position of the movable contact /Hiroshi to form an arc horn. Cage, tip part/J, part of a is arcla:/
Sl? It faces the notch groove /9c. Figure 6 shows the initial state of contact opening in the current interrupting action rp vr:2, which occurs between the fixed contact /3 and the movable contact l≠.
The arc A is stuck at this position VC at ¥g. As electrode opening progresses t, the distance W between point i 13 and /// is greater than the distance W between a part of arc runner 19 and the tip of movable electrode 7.2 /, 2Q-
As the distance between
It metastasizes between D and tip/2a. At this time, the tip /,
2a acts as an arc horn, and the distance r1 from the movable contact/4 increases due to the transition, so the wear and tear on the movable contact/Hiroshi is significantly reduced. Since it is strongly pressed against the arc extinguishing plate on the side and cooled, the light blocking performance is also improved.

[Summary of the invention]

The purpose of this invention is to further improve the current interrupting performance of a switch consisting of a fixed electrode having one or more arc runners and an arc extinguishing plate having a horseshoe groove. To provide a switch in which the relative positions of an arc extinguishing plate and an arc runner are set so that the bottom of a notch groove of an arc runner is farther away than the bottom of a horseshoe-shaped groove of the plate.

[Embodiments of the invention]

Figure 1, Figure 2, and Figure 1Q show one embodiment of the notch groove/? The bottom 15Jd of C is the fixed contact/
It is located far away when viewed from 3. That is, in Figure 1, the arc runner/de notch IQ/? Bottom of C/? The arc runner 1c and the arc extinguishing plate 6 are arranged in such a relative position that the arc runner d is hidden behind the arc extinguishing plate 16.

Note that in FIG. 70, the fixed electrode 11 is shown as having a recess //a.

Next, I will explain about the ah work.

The operation of each part during current interruption and the behavior of the arc at the initial stage of opening are exactly the same as those explained using FIGS. 5 to 7. However, the operation after the arc is transferred to the arc runner is different. This point will be explained with reference to Figure 2.

When the electrode opening progresses due to the rotation of the movable electrode 120 to which the movable contact/Hiroshi is attached, the arc person transfers to the arc runner/9, but the transition surface of the arc runner/9 is hidden behind the arc extinguishing plate/Otsu. Therefore, in order for arc A to transfer, it is necessary that multiple arc extinguishing plates /Ai' (series arcs be formed.In this respect, the notch groove of arc runner /wo /bottom of 9c /?d
Is the arc-extinguishing plate 16 horseshoe-shaped +'7+'? /ba Since the bottom part /Ab of a is located further away from the fixed contact /3, the arc A is separated by the arc extinguishing plate /AK as it transfers. Therefore, the arc runner rises, and the cooling effect is significantly improved.

In addition, the periphery of the notch groove 15'C of the arc runner 19,
As shown in Figure 2, the above effect can be ensured over the range from large currents to small currents by hiding the arc-extinguishing plate/6 behind the entire circumference.

Note that the same effect can be obtained even if the contactors are not limited to /pairs but are made up of a plurality of pairs.

〔Effect of the invention〕

The present invention can significantly improve the light shielding performance by using a simple configuration in which the positional relationship between a plurality of arc extinguishing plates having horseshoe-shaped grooves and an arc runner having a notched groove is kept constant.

[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 line nn in Figure 1, and Figure 3 shows the operation. Figure 7 is a partially sectional side view showing the state, Figure 1 is a partial perspective view of a different configuration, and Figures 1 to 7 are side views of main parts of Figure V, respectively, showing the state. Figures 1 to 7 show an embodiment of the present invention. The drawing is a partially cutaway perspective view of the main part, and Figure 2 is a plan view of the main part.
Fig. 1O is a side view of the main part, and Fig. 1/ is a side view of the main part showing the operating state. j...operation mechanism section, 7...envelope, //...fixed electrode,
/2...Movable electrode, /3...Fixed contact. /da...possible #l contact, /6...arc extinguishing plate, /6a...horseshoe groove, ibb...bottom of horseshoe groove /&a, /ri...arc runner, /Pc...notch groove, /de d...notch ζN
Bottom of i9c. In each figure, the same reference numerals indicate the same or corresponding parts. Heart 1 figure Kei 2 figure Ji 3 figure Horse 5 figure Flood figure 6 figure Flood figure 7 tail 9 figure Kei 11 figure A

Claims (2)

[Claims] (1) at least one pair of contacts consisting of a movable electrode to which a movable contact is attached and a fixed electrode to which a fixed contact is attached; a plurality of arc-extinguishing plates in which horseshoe-shaped grooves are formed; and an arc runner in which the bottom of the notched groove formed in the central portion of the arc runner is located further away from the bottom of the horseshoe-shaped groove with respect to the fixed contact. (2) The switch according to claim 1, wherein the edge of the notch groove of the arc runner is located behind the edge of the horseshoe-shaped groove of the arc extinguishing plate.