JPS59103218A - 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 The present invention relates to a switch that switches on and off current, and particularly to its arc extinguishing (remaining structure).

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

First, an example of a conventional electromagnetic contactor will be described with reference to FIG. In Figure 1, (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). The movable core is also 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 made of plastic and has a square shape. A crossbar with a window, at its lower end holds a moving core (3). (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 this movable contact (6); (8) is a fixed contact that is provided opposite to the movable contact (6) and conducts current, (8A) is a fixed contact that is provided on this fixed contact (8), and (80) 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 the fixed contact (8), and (111 is a cup (-) that covers the top surface of the electromagnetic contactor.
There is a fixed contact (8A) and a movable contact (6A) inside it.
A magnetic metal arc extinguishing plate (131) is provided to extinguish the arc a7J that occurs during the arc a7J.
1, 31, the fixed contact (8), and the fixed contact (8A) are shown. This metal arc-extinguishing plate 0 is a fixed contact (
It is constructed as a U-shaped frame that stands upright covering the fixed contact (8A), and a notch I through which the fixed contact (8) is inserted is provided in the vicinity of the fixed contact (8).

Because of the above configuration, in this conventional electromagnetic contactor, when the operating coil /I/ (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 occupies the state shown in Figure 1,
Either the fixed contact (8A) and the movable contact (6A) are opened and an arc is generated between the fixed contact (8A) and the movable contact (6A), or this arc Q21 is caused by the metal arc extinguishing plate (131). The arc is extinguished at the stain flow zero point, and the current is cut off.

The arc extinguishing process of the arc 02 in this conventional electromagnetic contactor will be explained in more detail with reference to FIG. 3, which shows a cross section of the arc extinguishing chamber.
Arc 0' generated between the movable contact (6A) and the fixed contact (8A)! J is attracted to the magnetic metal arc-extinguishing plate α and is stretched like an extended arc (12A). Since the arc voltage increases when the arc is stretched like this extended arc (12A), the arc voltage increases, so there is Dielectric breakdown occurred between the contact point (6A) and an arc (12A) occurred.
A) is divided into two arcs (12B) and (12G), and two arcs (12B) and (120
) is extinguished. In a conventional electromagnetic contactor that extinguishes the arc by such a process, the expansion of the shear arc is limited by the presence of the metal arc extinguishing plate α, so the arc voltage is low, and therefore the arc voltage is low. Insulation breakdown is unlikely to occur between the arc plate u~ and between the metal arc extinguishing plate a~ and the movable contact (6A).
120). In this way, with conventional magnetic contactors, it is difficult to obtain arc (121) breakage, which makes it difficult to obtain excellent breaking performance. Since arcs (120) are generated in the parts, these are the main cause of further deterioration of the breaking performance.

The present invention has been made with the aim of improving the breaking performance of a switch in order to eliminate the above-mentioned drawbacks, and includes a fixed contact joined to a fixed contact, and a fixed contact connected to a movable contact facing the fixed contact. a movable contact, and a metal arc-extinguishing plate erected around the fixed contact with the open part of the U-shaped wall facing the tip of the fixed contact; A U-shaped protrusion is formed in the vicinity of the contact, and this U-shaped protrusion is provided to protrude opposite to the separation space of the movable contact, and the distance between the U-shaped protrusion and the fixed contact is set as described above. The feature is that the distance between the movable contacts is approximately half of that of the movable contacts.

Hereinafter, the present invention will be explained with reference to the embodiment shown in FIGS. 4 to 7. Since the switch of this embodiment is the same as the conventional example described above except for the setting mode of the metal arc-extinguishing plate, the metal arc-extinguishing plate A perspective view of only α~ is shown in FIG.

As shown in FIG. 4, the metal arc-extinguishing plate (13) has a cutout end (14
1, bend the tongue-like extension to form a U-shaped protrusion (13A)
is provided. And this U-shaped protrusion (13A)
The distance 0) between it and the fixed contact (8) is approximately half the separation distance (2) of the movable contact (6A). In addition, this switch is suitable for use as a low voltage switch with an applied voltage of 660V or less, and is 6D, in which case it is D-2 to 6Wrm.
d = 1 to 3 vrn+.

A vertical cross-sectional view of the arc extinguishing chamber using this metal arc extinguishing plate (131) is shown in Figures 5 and 6. To explain the process from the time when the arc occurs during (6A) until it is extinguished, the arc 02 that occurred between the fixed contact (8A) and the movable contact (6A)
) is first attracted to the magnetic Kinkaku arc-extinguishing board Jushishi and goes through an arc (12D) state, and then arcs (12K) at (.
The metal arc-extinguishing plate (131) is stretched along the U-shaped protrusion (13A) as shown in FIG. Immediately after this, the arc (12F) has two arcs (1
It is divided into 2F) and (12G). In this way arc α
When the arc is divided into two, current flows through the U-shaped protrusion (13A) of the metal arc extinguishing plate a~, so the divided arc (
12F) and (12G) are further driven by the magnetic field created by the current flowing through the U-shaped protrusion (13A) of the metal arc-extinguishing plate flat, and the arcs move outward like the arcs (121) and (12I) in Figure 6. The arc is elongated and extinguished at the current zero point, and the current is cut off.

Since the arc is extinguished as if it were a lump, in the electromagnetic contactor to which the present invention is applied, the arc is extinguished near the metal arc extinguishing plate (one U-shaped protrusion (13A)) as described above. Immediately after dielectric breakdown occurs, the arc is split into two, and the magnetic field created by the current flowing through the metal arc extinguishing plate (13 U-shaped protrusions (13A)) drives the metal arc extinguishing plate at high speed. is,
This arc can be quickly extinguished. Moreover, unlike the conventional example shown in Figure 3, there is no electric field concentration on the metal arc-extinguishing plate (1), and no arc is generated at the tip, which has poor thermal conductivity, resulting in extremely excellent breaking performance. In particular, the distance C) between the U-shaped protrusion (13A) and the fixed contact (8) is approximately half the separation distance 0)) of the movable contact (6A). Therefore, it is possible to obtain a sufficient arc voltage increase, and there is an advantage that the shear arc time is shortened due to rapid arc movement.

The reason why we made the above interval ((1) approximately half of the interval ■) is because it was confirmed that if it is less than that, the arc voltage will not rise, and if it is more than that, it will be difficult for the arc between the contacts to move to the metal arc-extinguishing plate α3). It is.

It goes without saying that the present invention can be expected to have similar effects on fixed contacts (8) having different shapes as shown in FIG.

In addition, in the above explanation, only an example in which the present invention is applied to a switch that opens and closes the contacts using a magnet, that is, an electromagnetic contactor, is described, but this invention can also be applied to other devices such as circuit breakers. It is obvious that it can also be applied to switches.

As described above, in the present invention, a U-shaped protrusion is provided on the metal arc-extinguishing plate in the vicinity of the fixed contact, and the protruding end of the U-shaped protrusion is connected to the open space between the fixed contact and the movable contact. By making the distance between the U-shaped protrusion and the fixed contact approximately half the distance between the movable contacts, the breaking performance of the switch can be significantly improved.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of a conventional magnetic contactor, and Figure 2 is a partial cross-sectional view of a conventional magnetic contactor.
FIG. 3 is an explanatory diagram for explaining the arc extinguishing operation in a conventional electromagnetic contactor, and FIG. 4 is an enlarged view of the main parts showing the arc extinguishing chamber in the figure. FIG. 5 and FIG. 6 are explanatory diagrams showing the arc extinguishing operation of the embodiment of the present invention, and FIG. 7 is an explanation similar to FIG. 6 showing the main part of another embodiment of the present invention. It is a diagram. (6): Movable contact, (6A): Movable contact, (8): Fixed contact, (8A): Fixed contact, o4: Arc, α3
= Metal arc-extinguishing plate, (13A): U-shaped projection, (13B
): Gas flow hole, ■), 0): Interval In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Makoto Kuzuno - Figure 1 Figure 73 18A 8 Figure 5 Figure 6 Prisoner Figure 7

Claims (1)

[Claims] A fixed contact joined to a fixed contact, a movable contact opposite to the fixed contact joined to a movable contact, and a U-shaped vertical wall surrounding the fixed contact with the ab opening facing the tip of the fixed contact. and a gold-metal arc-extinguishing plate erected with a gold-metal arc-extinguishing plate, a KU-shaped protrusion is formed in the vicinity of the fixed contact on the metal-metal arc-extinguishing plate, and the U-shaped protrusion is provided in the separation space of the movable contact. A switch characterized in that the U-shaped protrusions are provided so as to protrude from each other and the distance between the U-shaped protrusion and the fixed contact is approximately half the separation distance of the movable contact.