JPS6149339A - 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.

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]

Figures 1 and 2 show a conventional block switch, in which a fixed electrode 3 and a movable contact 3 are attached to the opposing fixed electrode 1 and the movable contact 3, respectively. It constitutes a contactor. A horseshoe-shaped arc-extinguishing plate 6 is disposed in the operating mechanism section 5 to which the base end of the movable pole is connected. Envelope 7G''! Made of insulator and houses the operating parts of the switch.Envelope 7 has a fixed electrode/arc runner attached to which is provided an arc or hot gas discharge port t. There is.

With the above configuration, when the movable contact V is now in contact with the fixed contact 3, power is transferred from the power source to the fixed electrodes J/, -',
'R fixed, fixed, contact 1, point d, 3 → movable point DA → movable electrode 2, and is supplied to the load side Ll (supplied. A large current flows through the flat curved contact J1
．． Then, the operating mechanism section 3 operates to move the movable contact V away from the fixed contact J. At this time, as shown in Figure 3.

An arc A is generated between the fixed contact 3 and the movable contact DA,
An arc voltage is applied between the fixed contact 3 and the movable contact DA.

This arc voltage is the contact point H' for the fixed contact J.
% 41 increases as the separation distance increases. At the same time, the arc A is drawn toward the arc-extinguishing plate 6 by direct air force and expands, so that the arc voltage further increases.

Then, the arc current reaches its zero point, the arc A is extinguished, and the current is interrupted.

However, in one or more operations, the arc A does not move smoothly in the direction of the arc extinguishing plate A near the current zero point, and as shown in FIG. The arc A stagnates between the
Because it is separated from

The arc was not cooled sufficiently, resulting in poor breaking performance, which was a serious obstacle to upgrading the breaking capacity of the switch.

In order to solve the above problems, it has been proposed that a notch groove be formed in the arc runner attached to the fixed M and %.

As shown in FIG. 4, the fixed electrode /l with the fixed contact 13 attached has a notch @/? in the center. It is made by attaching an approximately horizontal U-shaped arc runner /9. Fixed contact/3 is notched groove/? It is located within c.

The fixed electrodes configured as described above are combined with the five movable electrodes 12 to form a pair of contacts, as shown in FIG. Then the pole lλ to the movable 1 with the movable contact/hiro
The tip part /2a is extended beyond the position of the movable contact /g, and the tip part /2a is extended beyond the position of the movable contact /g. When the electrode is closed as shown in the figure, a part of the tip 12a faces into the notch groove/7C.

With the above configuration, when the movable electrode /2 opens from the two-pole closed state shown in Fig. 5, the initial opening action shown in Fig. 6 occurs between the movable contact /G and the fixed contact /J. arc A
E-ma has been at a stalemate for a while with this subsidy. As electrode opening progresses, the high-temperature conductor 7 produced from arc A is filled with
And, contact/,,? , /'1 When the distance between the arc runner /W and the tip 7.2a of the movable C% /,I becomes smaller, the arc A becomes as shown in FIG.
Immediately, connect the arc runner/? from between contacts 13 and 71. and the tip end/2a.

As described above, when a large current is interrupted, the arc A is the contact point /, 7. /Arcrunner from between μ/? And movable! Since the arc A is transferred to the tip lλ of the pole and strongly pressed against the arc extinguishing plate, the arc extinguishing action is suitably performed.

However, even if the electrode structure of 1 or more is effective in interrupting large currents, the arc energy is small in the small current or overcurrent region, so a small amount of gas is generated due to high temperature conduction. For.

The arc does not transfer, and the desired effect cannot be expected.

This point will be further discussed with reference to FIGS. In Figure 5, this is because the amount of conductive gas generated from the arc is small in the small current range.

Arc runner/? The legs of the arc that have been transferred to , do not transfer discontinuously and travel along the path shown by the broken line arrow T. This route connects both legs of arc runner/9/? which leg/? Dropping the foot of the arc on a is an irregular phenomenon. As shown in Figure 1, the Ark person who has traveled in this way is attracted to the horseshoe-shaped arc-extinguishing plate 6 similar to that in the conventional device, and is drawn to both sides 6a of the horseshoe-shaped bottom of the arc-extinguishing plate shown by diagonal lines. reach and stop at that position. This state is shown in FIG.

As described above, the arc A at a small current has low energy and generates a small amount of high-temperature gas, so it does not sufficiently heat the arc extinguishing plate 6 and therefore does not form an arc spot on the arc extinguishing plate B. .

Therefore, if the arc extinguishing plate 6 is the same as the conventional one, the length of the arc will not be sufficiently extended and no series arc spots will be created, so that the cooling and arc extinguishing effect when the small 'rL flow is interrupted is This is not sufficient, resulting in a prolonged arc time and an inability to shut off the '#L flow.

[Summary of the invention]

In this invention, cut grooves are formed on both sides of the bottom of the notch of the horseshoe-shaped arc extinguishing plate, so that the arc is attracted to the cut grooves, and the cooling and arc extinguishing action of the arc extinguishing plate is performed with a small current. To provide a switch that can be fully utilized even when it is used.

[Embodiments of the invention]

The figure shows a horseshoe-shaped arc-extinguishing plate /6 in an embodiment of the present invention, in which thin cut grooves /Ab are formed on both sides of the bottom of a horseshoe-shaped notch /4a.

Fig. 1.2 shows the arrangement of the fixed electrode// and the arc extinguishing plate/6 in Fig. 1, and the edge of the notch groove /qc of the arc runner /q can be seen from the notch groove /Ab when viewed from above. placed in positional relationship. That is, regarding fixed contact /3,
Horseshoe-shaped notch/bottom of 6a/arc runner l than l and c? Notch groove/bottom of 9c/? d is placed behind it.

With the above configuration, when a small current is interrupted, the legs of the arc runner l/? The arc A that has traveled along the aiC is the cut groove/6b of the arc extinguishing plate/6.
It is attracted to and fully extends. This facilitates the cooling and arc extinguishing effects on the arc.

〔Effect of the invention〕

As described above, the present invention uses an arc runner in which a notch groove is formed in the center and a horseshoe-shaped arc extinguishing plate in which notch grooves are formed on both sides of the bottom of the horseshoe-shaped notch. Even if there is, the arc extinguishing effect can be improved and excellent interrupting performance can be realized.

[Brief explanation of drawings]

Fig. 1 to Fig. 10 show a conventional switch, Fig. 1 is a partially sectional plan view, Fig. 1 is a sectional view taken along the line n-n in Fig. 1, and Fig. 3 is a sectional view taken along the gland. FIG. 1 is a perspective view of the fixed electrode, FIGS. 3 to 1 are side views of main parts to explain the operation, and FIGS. 5 and 9 are the same. Main part plan view. FIG. 1θ is also a side view of the main part. Figure 1/Figure 1-Figure 1 shows an embodiment of the present invention;
FIG. 1 is a perspective view of the arc extinguishing plate, and FIG. 12 is a plan view of essential parts showing the positional relationship between the arc extinguishing plate and the arc runner. 5. Operating mechanism section, 7. Enveloping body, //. Fixed electrode,
lyu...movable electrode, lyua...tip part. 13... Fixed contact, /... Movable contact, /A'' arc extinguishing plate, /Ab... Notch groove, /゛7... Arc runner. In each figure, the same reference numerals refer to the same or equivalent parts. Figure 1 Oni Figure 2 Figure 4 Child 8 section Figure 9 Child 10 section

Claims (2)

[Claims] (1) Equipped with a movable electrode, a fixed electrode to which an arc runner with a cutout groove formed in the center is attached, and an arc extinguishing plate with cutout grooves formed on both sides of the bottom of the horseshoe-shaped cutout. A switch. (2) The switch according to claim 1, wherein the bottom of the notch groove of the arc runner is located behind the bottom of the horseshoe-shaped notch of the arc runner with respect to the contact of the fixed electrode.