JPH01194221A - Switch - Google Patents

Abstract

PURPOSE:To seek to improve breaking ability by providing a notch, toward a groove, at the end face opposed to the end face which has the groove formed at the separation space between contacts, of a metal arc extinguishing plate. CONSTITUTION:At a metal extinguishing plate 13 is formed a V letter-shaped groove 13a toward separation space between two contacts of a switch. A notch 13d is provided toward the groove 13a at the end face opposed to the end face where the groove 13a of this arc extinguishing plate 13 is formed. Short arcs 12c and 12d arise at the arc extinguishing plate 13 by the arc generated between both contacts due to the separation of the two contacts. The short arcs 12c and 12d are each arced by receiving forces of F1 and F2 by currents which flow in the arc extinguishing plate respectively and are driven up to the utmost recess of the arc extinguishing plate 13 and extinguished at the current zero point. Since the short arcs 12c and 12d are not driven to the contact side like this, dielectric break down at the two contact is prevented. Accordingly, breaking ability can be elevated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switch that opens and closes an R4 flow.

[Prior art] As a conventional switch, for example, Utility Model Application No. 57-192647
An electromagnetic contactor as shown in the partial sectional view of FIG. 6 in the publication is well known. Since this electromagnetic contactor is bilaterally symmetrical, only the right side is shown in cross section.

In the figure, (1) is a mounting base made of plastic, etc., (2) is a fixed core laminated with silicon steel plates on the mounting base (1), and (3) is placed opposite the fixed core (2). A movable iron core laminated with silicon steel plates, (
4) is an operating coil that provides a driving force to attract the movable core (3) and fixed core (2) against a tripping spring (not shown), and (5) is a crossbar made of plastic and having a square window. -, and a movable iron core (3) is held at its lower end. (6) is a movable contact inserted into the corner window of the crossbar (5) and held by a push spring (7); (6a) is a movable contact provided on the movable contact (6);
(8) is a fixed contact provided opposite to the movable contact (6) and conducts current, (8a) is a fixed contact provided on this fixed contact (8), and (8b) is the same. The terminal portion of this fixed contactor (8) is shown. (9) is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, (10) is a base for attaching a fixed contact (8), and (11) is a cover that covers the top of the electromagnetic contactor and is fixed inside. Contact (8a)
In order to extinguish the arc (12) generated between the movable contact (6a) and the movable contact (6a), a metal arc extinguishing plate (13) made of a magneto-visual material is provided, forming an arc extinguishing chamber. As is clear from the figure, the metal arc-extinguishing plates (13) are placed facing the movable contact (6), parallel to the fixed contact (8), and spaced apart from each other by a predetermined distance. There is. FIG. 7 shows a top view of this metal arc-extinguishing plate (13).
) is provided with a 7-shaped groove (13a). This 7-shaped groove (13a) is for making it easier to attract the arc (12).

The conventional switch has the above configuration, and its operation will be explained below.

In the electromagnetic contactor shown in Fig. 6, when the operation coil (4) is demagnetized, the movable core (3) is moved 11 ft from the fixed core (2) by a tripping spring (not shown), and the crossbar (5) is also The fixed contact (8a) occupies the upper position shown in
and the movable contact (6a) are rfi1! Fixed contact (8
An arc (12) is generated between a) and the movable contact (6a), but this arc (12) is attracted to the figure-7 groove (13a) of the metal arc-extinguishing plate (13) shown in FIG. , as shown in FIG. 6, becomes an arc (12a), is cooled and extinguished by the metal arc-extinguishing plate (13), and the current is interrupted.

Next, the operation after the arc (12) enters between the metal arc-extinguishing plates (13) will be explained in detail. Two short arcs (12c) and (12d) are generated on both sides of the metal arc-extinguishing plate (13), as shown in the operational diagram of FIG. Arc (12c
) indicates an arc occurring on the near side toward the metal arc-extinguishing plate (13) in FIG. 8, and arc (12d) indicates an arc occurring on the opposite side.

When the arc (12) enters between the metal arc extinguishing plates (13) and is divided into short arcs (12c) and (12d), the positions of the short arcs (12c) and (12d) are as shown in Figure 8. It shifts. A current shown by ■ flows through the metal arc extinguishing plate (13), and due to this current ■, the short arc (12c) receives a force shown by F+ and is driven, and the short arc (12d) receives a force shown by F2. The operation is driven as shown in FIG. 9, which is an explanatory diagram of the operation. 9th
In the figure, the short arc (12c) receives a force indicated by Fl due to the current I, but this force F1 is decomposed into F3 and F4, and the F4 component causes the metal arc extinguishing plate (13) to
) is driven towards. The short arc (12d) is the current■
receives a force shown by F2, but this force F2 is F5
is decomposed into F6, and the F6 component is dissolved into a metal arc extinguishing plate (13
) is driven toward the - point (13c), as shown in FIG. 10, which is an explanatory diagram of the operation. When it becomes as shown in Figure 1O, a large amount of conductive gas heated by the short arc (12d) flows between the fixed contact (8a) and the movable contact (6a), so that the fixed contact (8a) and the movable contact Dielectric breakdown occurs between the contacts (6a) and the short arcs (12c) (12d) between the metal arc-extinguishing plates (13) are extinguished, so the conventional switch is configured and operated as described above. As a result, the problem of deterioration in interrupting performance has been resolved.

This invention was made in order to solve the above-mentioned problems, and is a means for obtaining a switch with excellent breaking performance and solving Lm. It is equipped with a metal arc-extinguishing plate having a releasable contact and a groove formed toward the separation space between the two contacts, and an end face of the metal arc-extinguishing plate opposite to the end face where the groove is formed. A notch is provided toward the groove.

[Function] The switch according to the present invention can improve the breaking performance because the current path can be changed by the notch temporarily provided in the metal arc extinguisher and the phenomenon in which a short arc is driven toward the contact side can be prevented.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. Since it is the same as the conventional switch shown in FIG. 6 except for the metal arc-extinguishing plate, only the shape of the metal arc-extinguishing plate is shown in the top view of FIG. 1st
In the figure, (13) is a metal arc-extinguishing plate, (13a) is a 7-shaped groove provided in the metal arc-extinguishing plate (13), and (13d) is a 7-shaped groove (13a) in the metal arc-extinguishing plate (13). ) is a notch provided toward the 7-shaped groove (13a) on the end face opposite to the end face where the 7-shaped groove (13a) is formed.

Next, the operation will be explained. Note that only the points different from the conventional switch shown in FIG. 6 will be explained. In the operation explanatory diagram of Fig. 2, the short arcs (12c) (12d) are caused to F by the current I flowing through the metal arc extinguishing plate (13).
The receiver is driven by the force of +, F2, and the operation becomes as shown in FIG. 3. A short arc with a lid (12c) as shown in Figure 3
) and (12d) are further driven by the forces Fl and F2, respectively, due to the current I flowing through the metal arc-extinguishing plate (13), and the metal arc-extinguishing plate (■3 )
The arc is driven to the innermost part of the arc, and the arc is extinguished at the zero current point.

In this way, in this invention, the short arc is not driven toward the contact, so dielectric breakdown between the movable contact and the fixed contact is prevented. Therefore, the interrupting performance can be improved.

FIG. 5 is a partial sectional view showing another embodiment of the present invention.
lla) is the arc extinguishing chamber wall surrounding the metal arc extinguishing plate (I3), here a small hole for releasing conductive arced gas provided in the opposite part of the notch (13d) of the cover (11), (20) is the metal arc extinguishing plate A small gap is provided between the plate (13) and the arc cover (11).

In this embodiment, a small hole (lla) for releasing conductive arced gas is provided in the vicinity of the metal arc extinguishing plate (13), so the conductive arced gas is discharged outside the arc extinguishing chamber from here, and inside the arc extinguishing chamber. Since the density of the conductive arced gas is reduced, the interrupting performance can be further improved. Also,
Since the metal arc extinguishing plate (13) does not come into close contact with the arc cover (11) and a small gap (20) is provided, the conductive arced gas can easily flow and the interrupting performance can be improved.

In addition, in the above embodiment, the figure 7-shaped groove is explained as the groove of the metal arc-extinguishing plate, but it can be applied to any shape.
Further, the shape of the notch is not limited to the above embodiment, and any shape may be used to achieve the same effect.

Further, in the above embodiments, the case where the present invention is applied to a switch such as an electromagnetic contactor has been described, but it is obvious that the present invention can be applied to other switches such as a molded circuit breaker.

[Effects of the Invention] As described above, according to the present invention, there is provided a metal arc-extinguishing plate having at least one contact that is movable and capable of approaching and separating, and a groove formed toward the separation space between the two contacts. In the present invention, a switch with excellent interrupting performance can be obtained by providing a notch toward the groove on the end face of the metal arc-extinguishing plate opposite to the end face on which the groove is formed.

4. If! Brief description of page 1 Fig. 1 is a top view of a metal arc-extinguishing plate according to an embodiment of the present invention, Figs. 6 is a partial sectional view showing a conventional switch; FIG. 7 is a top view of the metal arc-extinguishing plate shown in FIG. 6; FIGS. FIG. 10 is an explanatory diagram of the conventional operation.

In the figure, (6a) is a movable contact, (8a) is a fixed contact, (13) is a metal arc-extinguishing plate, and (13a) is a metal arc-extinguishing plate (1
3) groove provided in (13b) is a metal arc extinguishing plate (13)
It is a notch provided in the.

In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A metal arc-extinguishing plate having at least one contact that is movable and capable of approaching and separating, and a groove formed toward the separation space between the two contacts, wherein the groove of the metal arc-extinguishing plate is A switch characterized in that an end face opposite to the formed end face is provided with a notch toward the groove. (2) First
2. The switch according to item 1, wherein a hole for discharging conductive arced gas is provided in a cutout opposing part of the arc extinguishing chamber wall surrounding the metal arc extinguishing plate.