JPH02220315A - Power switch - Google Patents

Abstract

PURPOSE:To downsize a power switch without deteriorating cutoff performance by providing a thin insulating plate and a magnetic plate between the two pieces opposed to one another in a U-shaped fixed contact. CONSTITUTION:A fixed contact 8 has a U-shaped cross section and has a first piece 8B with which a fixed contact point 8A is connected and a second piece 8c that is extended to the first piece and is opposed thereto, with an insulating plate 14 and a magnetic plate 15 provided between the first piece 8B and the second piece 8c. As the magnetic plate 15 is inserted between the first piece 8B and the second piece 8c, even when they are in close proximity to one another, arc is sufficiently driven. When the fused metal that is formed by the arc heat is splashed, with the insulating plat 14 inserted between the first piece and the second piece, they are not bridged by the fused metal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arc extinguishing mechanism for a 2% switch that performs first-class switching.

The main applicable switches of the present invention include electromagnetic contactors and circuit breakers.

[Conventional technology]

FIG. 4 is a partial sectional view of a conventional electromagnetic contactor disclosed in, for example, Japanese Patent Application Laid-Open No. 62-274515.

In Figure 4, (1) is a mounting base made of plastic, (2) is a fixed core laminated with silicon steel plates on this mounting base, and (3) is a fixed core installed opposite to fixed core (2). A movable core (4) is also laminated with silicon steel plates, and (4) is an operating coil that provides a body force that attracts the movable core (3) and the fixed core (2) against a tripping spring (not shown).
(5) is a crossbar made of plastic and having a square window, at its lower end holding the movable iron core (3).

(6) is a movable contact inserted into the corner window of the crossbar (5) and held by the push spring (7);
) is a movable contact provided in the movable contactor (6).

(8) is provided facing the 0r moving contact (6),
A fixed contact that carries current, (8A) is a fixed contact provided on this fixed contact (8), (8B) is a first piece to which the fixed contact (8A) is joined, (8c) is a first piece. This is the second piece facing the first piece (8B). 1st. Second piece (8B).

The plate thickness of (8C) is, for example, 2i+m+1st. Second piece (8
E).

The gap between (8C) is, for example, 5 mm.

(9) is a terminal screw for connecting the electromagnetic contactor body to an external circuit, 11 is a base for attaching the fixed contact (8), and αυ is a cover that covers the top surface of the magnetic contactor.

A metal arc-extinguishing plate 0 made of a magnetic material is provided inside to extinguish the arc αΔ generated between the fixed contact (8A) and the movable contact (6A), and this metal arc-extinguishing plate α3 is the fourth As is clear from the figure, the fixed contact (8
) are stacked parallel to this above and spaced apart from each other by a predetermined distance.

Next, the operation will be explained.

In this electromagnetic contactor, when the operating coil (4) is demagnetized, the 0r dynamic core (3) is separated from the fixed core (2) by a tripping spring (not shown), and the crossbar (5) also assumes the state shown in FIG. Fixed contact (8A) and movable contact (6A)
) are opened and an arc is generated between the fixed contact (8A) and the movable contact (6A), but as shown in Figure 5, this arc (8) and is driven by the magnetic field created by the current flowing through it.

The arc (12A) is attracted to the magnetic metal arc-extinguishing plate α and stretched like an arc (12A), and finally the arc (12A) passes from the tip of the movable contact to the arc-extinguishing plates (13a) to (16f).
) through (13c) to (1sf) of the fixed contacts (
The arc (12B) transferred to 8) is extinguished,
Current is interrupted.

[Problem to be solved by the invention]

The conventional F1 switch is configured and operates as described above, but since the fixed contact (8) is U-shaped,
Although the breaking performance is excellent, there is a problem that the fixed contact (8) is large, and therefore the external dimensions of the switch are large. In an attempt to downsize the fixed contact i8), two opposing pieces (8B) and C of the fixed contact (8) are
80), the magnetic field created by the current flowing through the fixed contact (8) is weakened, and the molten metal generated by the arc heat bridges the two opposing pieces of the fixed contact (8), causing the arc to There was a problem that the drive was obstructed.

This invention was made in order to solve the above-mentioned problems, and its purpose is to obtain a power switch 4 that has excellent interrupting performance and is small in size.

[Means to solve the problem]

The power switch according to the present invention is a fixed contact having a U-shaped cross section and having a first piece to which a fixed contact is joined and a second piece that is connected to this piece and faces this piece.

The device includes a movable contact to which a movable contact that can come into contact with and separate from the fixed contact is joined, and an insulating plate and a magnetic plate interposed between the first piece and the second piece.

[Effect]

In the power switch of this invention, a thin insulating plate and a magnetic plate are interposed between the two opposing pieces of the U-shaped fixed contact, so that the fixed contact is damaged by the molten metal generated by arc heat. It can prevent two opposing pieces from bridging or weakening the magnetic field created by the current flowing through the fixed contact, and can shorten the distance between the two pieces of the fixed contact without degrading the breaking performance. can be made smaller.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, (I4 is, for example, a thickness of 03 or 0.5
Insulating board made of my friend's glass epoxy board, q! Reference numeral 9 denotes a magnetic plate made of, for example, an iron plate with a thickness of 1 volt. Fixed contact (8
) has a U-shaped cross section, and has a first piece (8B) to which the fixed contact (8A) is joined, and a second piece (8c) that is connected to this piece and faces this piece, and has a U-shaped cross section. An insulating plate α and a magnetic plate (l!9) are interposed between the first piece (8B) and the second piece (8C).The thickness of the first and second pieces (8B) and (80) is, for example, It is 2n.

In this example, two pieces (8B) of the fixed contactor (8) + (
80) After inserting the insulating plate I and the magnetic plate α between the two pieces (8B).

Pressurize (8C) to shorten the distance between the two pieces (8B) + (80).

Insulating plate α4 and magnetic plate U! 9 is suppressed and fixed.

Next, the operation will be explained.

In this electromagnetic contactor, when the operating coil (4) is demagnetized, the movable core (3) is separated from the fixed core (2) by a tripping spring (not shown), and the crossbar (5) also assumes the state shown in FIG. , fixed contact (8A) and movable contact (6A)
When they open, an arc (I7J) is generated between the fixed contact (8A) and the movable contact (6A), but this arc (I) flows between the movable contact and the fixed contact as shown in Figure 1. t
M is driven by the magnetic field created by the flow, and is attracted to the magnetic metal arc-extinguishing plate α and stretched like an arc (12A), and finally the arc (12A) is drawn from the tip of the movable contact. The arc (12B) is transferred to the fixed contact (8) through the arc extinguishing plates (15a) to (13f) (13c) to (13f) and is extinguished, thereby interrupting the current.

By the way, in the present invention, the first piece (8B) of the fixed contact
Since a magnetic plate is inserted between the and second piece (8C), the arc is sufficiently driven even if the first and second pieces are close to each other as shown in Figure 1. . Also.

Even if molten metal generated by arc heat is scattered.

Since the insulating plate 0 is inserted between the first piece and the second piece, the first piece and the second piece are not bridged by molten metal.

Note that even if the positions of the magnetic temporary housing 9 and the insulating plate I are switched as shown in FIG. 2, the same effect as in the case of FIG. 1 can be obtained. Furthermore, as shown in FIG. 3, the same effect as in FIG. 1 can be obtained even if insulating plates α-acid are provided on both sides of the magnetic plates t1!9.

Further, in the above embodiments, the case where the present invention is applied to an electromagnetic contactor has been described, but it goes without saying that the present invention can also be applied to other power switches such as a circuit breaker can.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a fixed contact having a U-shaped cross section, which has a first piece to which the fixed contact is joined, and a second piece that is connected to this piece and faces this piece; The present invention includes a movable contact to which a movable contact that can be brought into and out of contact with a movable contact is joined, and an insulating plate and a magnetic plate interposed between the first piece and the second piece.

This has the effect of reducing the size of the power switch by shortening the distance between the two pieces of the fixed contact without reducing the breaking performance.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the main parts of a power switch according to one embodiment of the present invention, FIGS. 2 and 3 are front views showing the main parts of another embodiment of the invention, and FIG. 5 is a partial cross-sectional view showing a conventional power switch, and FIG. 5 is a front view showing a main part of the power switch shown in FIG. In the figure, (6) is a movable contact, and (6k) is a movable contact. (8) is a fixed contact, (8A) is a fixed contact, (8E
) is the first piece, (SC) is the second piece, 0 country is a metal arc extinguishing plate, α core is an insulating plate, Q! 9 is a magnetic plate. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A fixed contact having a U-shaped cross section, which has a first piece to which a fixed contact is joined, and a second piece that is connected to and faces this piece, and a movable contact that can come into contact with and separate from the fixed contact is joined. A power switch comprising a movable contact, an insulating plate and a magnetic plate interposed between the first piece and the second piece.