JPS62291821A - 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] λ Detailed Description of the Invention [Field of Industrial Application] This invention! ” relates to a switch that switches on and off current, especially its arc-extinguishing mechanism.

The main applicable switches of this invention include electromagnetic contactors and distribution circuit breakers.

[Conventional technology]

First, an example of a prior art electromagnetic contactor will be described with reference to FIG. In FIG.

+1) is a mounting base made of plastic, +21H
A fixed core laminated with silicon steel plates on this mounting base, f
3+ is installed opposite the identified iron core (2) and is the same as this (a movable iron core laminated with silicon steel plates, (4) is a movable iron core (3)
The operating coil (5) that provides a driving force to attract the fixed iron core (2) against a tripping spring (not shown) is a crossbar made of glass and having a square window.

A movable iron core (3) is held at its lower end. (6) is inserted into the corner window of the crossbar (5) and presses the spring (7).
), (6A) is a movable contact provided on the movable contact (6), (8) is provided opposite the movable contact (6), and is configured to conduct current. (8A) is a fixed contact provided on this fixed contact (8), and (8B) is a terminal portion of this fixed contact (8).

Therefore, tLllll is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, QIJ is a base for attaching a fixed contact (8), and σ11 is a cover that covers the top surface of the wL magnetic contactor (9). 8A) and movable contact (6A
) is provided with a magnetic metal arc extinguishing plate 0:1 for extinguishing the arc α2 generated between The fixed contacts 181 and the fixed contacts 181 are cumulatively arranged side by side in a child row with a predetermined interval apart from each other on the movable contact side.

When the operation coil (4) is demagnetized in the brass contactor 1 having the above configuration, the movable core (3) is separated from the fixed core (2) by a tripping spring (not shown).

The crossbar (5) also occupies the state shown in FIG. 8, in which the fixed contact (8A) and the movable contact (6A) are separated and the fixed contact (
8A) and the movable contact (6A), but this arc IJ2 is caused by the metal arc-extinguishing plate α as shown in FIG.
It is attracted by the wire and stretched like an arc (+2A),
Ultimately, the arc (+2A) is transmitted from the tip of the movable contact to (130~
The arc (12B) is transferred to the fixed contact (8) via (+3f) and extinguished, and the current is cut off.

[Problem that the invention seeks to solve]

The conventional switch is as above! However, since it takes a long time for the arc leg on the contact to transfer to the fixed contact and the movable contact of the contact, the problem is that the contact wears out frequently.

This invention was made to solve the above-mentioned problems, and is a switch with less contact wear. The purpose is to obtain.

[Means for solving problems]

In the switch according to the present invention, the fixed welder has a first piece to which the fixed contact is joined, and a second piece that extends from the first piece and faces the tip of the movable contact when both contacts are in contact. with a piece of
and a third piece extending from the second piece to the side opposite to the movable contact, each metal arc-extinguishing plate is provided opposite to the third piece, and the metal arc-extinguishing plate is movable when both the contacts are fully opened. The distance between the tip of the contact and the second piece is smaller than the distance between the two contacts.

[Effect]

In the switch of this invention, the distance between the tip of the movable contact and the second piece of the fixed contact is smaller than the distance between the two contacts when the movable contact and the fixed long point are fully opened. Therefore, the distance between the tip of the movable contact and the second piece is 9
This is because when the distance between both contacts becomes large, dielectric breakdown occurs between the tip of the movable contact and the second piece, forming an arc.

Since the arc between both contacts is quickly extinguished, contact wear is reduced.

〔Example〕

An embodiment of the present invention will be described below.

In Fig. 1, (61 is a movable contact to which a movable contact (6A) is connected, (6D)!” is a movable contact (6A), and (6D) is a movable contact (6A).
(8B) is a movable contact (6A).
A first piece to which a fixed contact (8A) that can be brought into and out of contact with is joined;
(8c) extends from this first piece (8B) and has both contacts ((SA), (8A) movable contact 16 when in contact.
), the second piece facing the tip (6D), (8D)
Fi is the third piece extending from the second piece (8C) to the anti-movable w%J child side, the first piece, and the second piece.

Third piece, (8B), <80), (8D)
Fixed contact f! : Release f1. Here, the k112 fox is between the tip F4A (6C) of the movable contact 16) and the l-th piece (80) of the fixed contact 18).

The movable contact (6A) is configured to be smaller than the distance between the movable contact (6A) and the fixed contact (8A) when it is fully open, and a gold JIA arc extinguishing plate u3 is installed in parallel with the third piece of the fixed contact 18). is installed.

Next, the operation will be explained, focusing on the differences from the operation of the conventional switch shown in FIG.

When the movable contact (6A) is pulled from the fixed contact (8A), an arc (Iz) is generated as shown in Fig. 1.The heat of this arc σ2 causes the arc r1″2 to contain charged particles. A large amount of gas is generated, and a portion of the gas flows between the tip (60) of the movable contact (6) and the second piece (80) of the fixed contact (8). Therefore, the contact separation distance X (shown in Figure 2) is the tip (6a) of the movable contact (6)
) and the second piece (8C) of the fixed contact (8)
(as shown in Figure 2).

Dielectric breakdown occurs between the tip (60) of the movable contact (6) and the second piece (8C) of the fixed contact (8), causing an arc (+
2A) is generated. Since the length of the arc σ2 between the contacts is longer than the length of the arc (12A), the arc 0a disappears.

When the movable contactor (6) is further opened, the arc (+2A) is stretched as shown in Fig. 3, and the magnetic metal arc extinguishing plate 0j
The arc (12B) is driven between the magnetic metal arc extinguishing plates 03 like (+20), and the arc (+2B)
0) is cooled and arc extinguished by the metal arc extinguishing plate (13).As explained above, in one embodiment of the present invention, the fixed contact (8
A) and the movable contact (6A), the legs of the arc will be transferred to the second piece (8C) of the fixed contact (8) in a short time due to the dielectric breakdown phenomenon.
) and the tip end (60) of the movable contact (6:), so contact wear is reduced.

In the above embodiment, the tip (60) of the movable contactor (6) forms an arcing horn, but as shown in FIG. 4, the arcing horn may not be provided.

Further, the fixed contact (8) may have a U-shaped portion formed by extending an inverted arc runner on the first piece (8B), as shown in FIGS. 4 and 5. . Furthermore, the arrangement of the metal arc-extinguishing plate αJ may be perpendicular to the third piece (8D) of the fixed contact (8) as shown in FIG.

Further, in the above embodiment, the case of an electromagnetic contactor is explained, but the present invention can also be applied to other switches such as a molded case circuit breaker.

An example of application to a molded case circuit breaker is shown in FIG. 1st
In the figure, 114J is the rotation axis of the movable contact (6), and the movable contact (6) is rotated about this axis I by a drive device (not shown), thereby rotating the movable contact (6A).
) comes into contact with and separates from the fixed contact (8A).

The embodiments shown in FIGS. 4-T also provide the same effects as the embodiment shown in FIG. 1.

〔Effect of the invention〕

As described above, according to the present invention, the fixed contact extends from the tenth piece to which the fixed contact is joined and this first piece, and faces the tip of the above-mentioned JJJ contact when both contacts are in contact. Second
and a third piece extending from the second piece to the side opposite to the movable contact, and each metal arc-extinguishing plate is provided opposite to the third piece.

Since the distance between the tip of the movable contact and the second piece is smaller than the distance between the two contacts when both contacts are fully open, it is possible to obtain a switch with less contact wear.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing the main unit of a switch according to an embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams of the operation of an embodiment of the invention, and Figs. 4 to γ are respectively FIG. 8 is a partial cross-sectional view of a conventional switch, and FIG. 9 is an explanatory diagram of the operation of the switch shown in FIG. 8. (61 is a movable contact, (6A) is a movable contact,
(6D) is an arc horn, )8) is a fixed contact,
(8A) is a fixed contact, (8B) is the first piece,
(8o) is the second piece, (8D) is the third piece

Claims (3)

[Claims] (1) A fixed contact joined to a fixed contact, a movable contact joined to a movable contact and capable of coming into contact with and separating from the fixed contact, and a plurality of metal arc extinguishers provided on the movable contact side of the fixed contact. In the one comprising a plate, the fixed contact includes a first piece to which the fixed contact is joined, and a second piece extending from the first piece and facing the tip of the movable contact when both contacts are in contact. , and a third piece extending from the second piece to the side opposite to the movable contact, each metal arc-extinguishing plate is provided opposite to the third piece, and when both the contacts are fully opened, the metal arc-extinguishing plate A switch characterized in that the distance between the tip of the movable contact and the second piece is smaller than the distance between the two contacts. (2) A switch characterized in that the tip of the movable contact is erected facing each metal arc-extinguishing plate to form an arc horn. (3) The switch according to claim 1 or 2, wherein the fixed contact has an inverted L-shaped arc runner extending from the first piece.