JPS6149342A - 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, a switch with a small number (1 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]

Figure 2 and Figure vJ2 show a conventional switch of this type,
A fixed contact J and a movable contact J are respectively attached to a fixed pole L and a movable electrode arranged opposite each other, forming a pair of contacts. The base end of a movable electrode 2 is coupled to the operating mechanism section 5, and the movable electrode 2 is rotated. An arc extinguishing plate B is provided between the electrodes 3 and 2 to cool the arc generated between the contacts 3 and 4. The enclosure 7 is made of an insulator and houses the operating parts of the switch.

The package 1fI1 body 7 is provided with an arc or hot gas outlet g. An arc horn is attached to the fixed electrode l.

With the above configuration, when the movable contact Hiroshi is now in contact with the fixed contact 3 as shown in Fig. 3, power is transmitted from the source to the fixed electrode/→fixed contact 3→movable contact G→movable electrode. It is then supplied to the Kikan side.

In this state, if a large current such as a short-circuit current flows between the contacts, the operating mechanism operates to separate the movable contact from the fixed contact 3. At this time, as shown in FIG. 3 and FIG. 5, an arc A is generated between the fixed contact 3 and the movable contact G, and an arc voltage is generated between the fixed contact 3 and the movable contact G. This arc voltage increases as the separation distance of the movable contact q from the fixed contact 7 increases. Also.

As the arc is drawn toward the arc extinguishing plate 6 side by magnetic force and expands, the arc voltage further increases. Then, the current flowing through the arc reaches a zero point, the arc A is extinguished, and the current is cut off.

Considering the above operation in more detail with reference to FIG. 5, which shows the state when the current is cut off, the movable electrode rotates about the rotation center 10 and opens. In this opening operation [,
The spatial distance between the movable electrode and the fixed electrode l is shorter than the distance between the abdominal core a of the movable electrode and the tip a of the fixed electrode. On the other hand, the arc A generated between the movable contact Hiroshi and the fixed contact J receives an electromagnetic force from the current Ix flowing through the fixed electrode / and the current Ix flowing through the movable electrode J, and the resultant force is a force in the direction of the arrow F. receive. However, this electromagnetic force is relatively small because the current flows linearly when the pole structure is closed as shown in Figure 3. Therefore, in general, the arc A is the opening action of the movable electrode. Accordingly, it moves from a position between the movable contact 30 and the fixed contact 30 to a position a short distance between the abdomen λa of the movable electrode 1 and the tip /a of the fixed electrode 1.

It stagnates there. Therefore, in Fig. 1, the arc person does not come into contact with the arc extinguishing plate B, which is located to the right of the 3° angle of contact, and the arc A is not cooled, resulting in a problem in that the desired breaking performance cannot be obtained.

Furthermore, even if the distance between the abdomen λa and the tip la is not particularly short as described above, the arc path may be different from the fixed contact 3.
Many structures have a short distance between the contact point 3. and the movable contact point. Stopped at Hiroma. In this way, even though the arc A was cooled by the arc extinguishing plate 6, contact wear was promoted due to stagnation of the arc on the contact, which caused a serious problem in upgrading the breaking capacity of the switch. [Summary] This invention attempts to solve the above-mentioned drawbacks of the conventional ones.A notch groove is provided in the center of the arc runner, so that when the contactor is closed, a part of the movable lightning and the pole do not fit inside the notch groove. By configuring it to be located at the current point of the arc leg, the position at the current zero point can be suitably sterilized, the function of the arc extinguishing plate can be effectively demonstrated, and it has excellent current interrupting performance. To provide a switch which minimizes wear and tear on contacts.

[Embodiments of the invention]

6, 7 and g show an embodiment of the present invention. In FIGS. 6 and 7, the arc runner/de attached to the fixed electrode to which the fixed contact 13 is attached is shown in FIG. , forms a horizontal U-shape, the lower side of which is /? It is attached to the fixed voltage %, / / by a suitable fastening member 20 at a.

Arc runner/? The upper side of /? b has a notched groove in the center/
9c is formed, and this notch groove i9'c extends to the curved part of the arc runner.

Figure g shows the above configuration of fixed electrode l/ and movable electrode/,
A movable electrode with a movable contact/da is shown, and the movable electrode/2 is rotated about the rotation axis io, and its tip l core a is lower than the movable point/Hiro's attached lid. It extends appropriately to form an arc bone. A part of the tip 12a has a notch groove/? when the electrode is closed. It overlaps with c.

The arc-extinguishing plate 16 is similar to the conventional one.

The structure of the pond and the switch as a whole are the same as those of the conventional one seen earlier, and the explanation thereof will be omitted.

Next, the dynamic rμ will be explained.

By starting the electrode opening operation from the electrode closed state shown in Fig.
7J! As shown in FIG. 9, an arc A is generated between the fixed contact 13 and the movable contact/Hiro. - 10,000, When the electrode is closed, a part of the tip of the movable electrode 12/yu a is the notch groove of the arc runner/9/? Since cK overlaps with 0, in such a case, after a certain point in the initial stage of contact shown in Fig. 719, the part that is less than the distance between the contacts is connected to the tip 12a and part of the arc runner /9. In this way, the shorter distance is between the tip /2a and the notch groove /?
(This is the part between the upper end/9d.

Therefore, the arc person generated between the points of contact is transferred to the above-mentioned area and becomes arc B.

As the electrode opening progresses further, as shown in FIG.

Ark B is an arc runner/? The arc-extinguishing plate is strongly pressed against the arc-extinguishing plate by the electromagnetic repulsion caused by the flowing water, and is cooled. Moreover, the tip end part 2a of the movable electrode 2a functions as an arc horn.

The leg of arc B moves away from the movable contact/hiro, greatly reducing contact wear.

Figure 1/Figure 72 shows other saturation examples.

The fixed contact 13 is connected to the notch '7/? of the arc runner 19. The configuration is located within c.

The first J rf, 'I and the first figure show still another embodiment, in which the arc runner l is fixed to the back surface of the fixed 'It pole/i.

In either case, similar effects can be obtained.

Incidentally, the clitic f-mutation is not limited to l pairs, but is the same even if there are multiple pairs.

〔Effect of the invention〕

As described above, the present invention significantly improves the interrupting performance by promoting the cooling of the arc generated at the time of contact opening.

It has the effect of reducing contact wear and tear.

[Brief explanation of drawings]

Volume/Figures to Figures 5 show conventional switches, and Figure 1 shows some W switches.
Figure 3 is a side view of the main part, Figure V is a partially sectional side view for explanation of operation, The figure is a side view of a main part for explaining the operation. FIGS. 6 to 10 show main parts of an embodiment of the present invention,
The sixth figure is an exploded perspective view, and the seventh figure is a perspective view. The first figure is a side view, and FIGS. 9 and 1θ are side views (2) for explaining the operation. Figure 1/ and Figure 1- are a side view and perspective view of the main part of the pond implementation f+li, and Figure 73 and Figure 1F- are a side view and perspective view of the main part of another implementation 1]. It is. j...operation mechanism section, 7...envelope, ti...fixed electrode,
/2...Movable electrode, /core aa/tip (arc horn)
, /,7...fixed contact, /Hiro...movable contact, /A...arc extinguishing plate, /ri...arc runner. /9c...notch groove. In each figure, the same reference numerals indicate the same or corresponding parts. 1 figure, 2 figures, 3 figures, 6 figures, 7 figures.

Claims (3)

[Claims] (1) At least one pair of contacts consisting of electrodes with attached contacts arranged so that the current path becomes almost straight when closed, an arc extinguishing plate for cooling the arc, and attached to a fixed electrode. A switch equipped with an arc runner and an enclosure made of an insulator, characterized in that the arc runner is provided with a notched groove in the center of which a part of the movable electrode overlaps when the electrode is closed. switch. (2) The switch according to claim 1, which includes a substantially U-shaped arc runner. (3) The switch according to claim 1, comprising a movable electrode whose tip portion forms an arc horn.