JPS61256518A - 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 [Field of Industrial Application] The present invention relates to an arc extinguishing mechanism for a switch 1% that switches on and off current.

[Conventional technology]

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. Conventional electromagnetic contactors are symmetrical, so the second
The figure shows a cross section of the piece gI11. In Figure 2, (1
) is a mounting base molded from plastic.

(2) is a fixed core laminated with silicon steel plates on this mounting base, (3) is a movable core that is installed opposite to fixed core (2) and is also laminated with silicon steel plates, and (4) is a movable core ( 3) and fixed iron core (2) with a tripping spring (C1 not shown)
An operating coil that provides the driving force to resist and attract.

(5) is a crossbar made of plastic and having a square window, at its lower end holding the movable iron core (3).

16) is a movable contact inserted into the corner window of the crossbar (5) and held by a push spring (71);
A) is a movable contact provided on this movable contactor (6),
(6B) is an end face of the movable contact (6), (8) is a fixed contact that is provided facing the movable contact (6) and conducts current flow, and (8A) is this fixed contact (8). )
The fixed contact provided in (8C) also indicates the terminal portion of this fixed contact (8).

Therefore, (9) is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, +II is a base for attaching a fixed contact (81), and αB is a cover that covers the top of the electromagnetic contactor.

A magnetic metal arc-extinguishing plate a3 is provided inside to extinguish the arc α2 generated between the fixed contact (8A) and the movable contact (6A). A perspective view is shown. This metal arc extinguishing plate (11 is a fixed contact (8A)
It is configured as a U-shaped frame erected covering the movable contact, and extends from the movable contact (6) to the fixed contact (8) facing the end surface (6B) of the movable contact, and the contact (6A), (8A)
It curves to the side to form a U-shaped protrusion (13A).

I is the notch through which the fixed contact +81'f is inserted, (
14A) is a side plate of a U-shaped frame.

Because of the above configuration, in this conventional electromagnetic contactor, when the operation 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) is also separated from the fixed core (2). , the fixed contact (8A) and the movable contact (6A) are opened and an arc zero occurs between the fixed contact (8A) and the movable contact (6A). - αa is extinguished at the current zero point by the metal arc-extinguishing plate 0, and the current is cut off.

The arc extinguishing process in this conventional electromagnetic contactor will be explained in more detail with reference to FIG. 4, which shows a cross section of the arc extinguishing chamber. is first attracted to the magnetic metal arc-extinguishing plate α, passes through the state of arc (12D), and then exits (1211).
As shown in i), the metal arc extinguishing plate is curved and extended along the U-shaped protrusion (13A), increasing the arc voltage. Furthermore, between the movable contact (6A) and the U-shaped protrusion (13A) of the metal arc-extinguishing plate (13), and between the U-shaped protrusion (15A) of the metal arc-extinguishing plate 0 and the fixed contact (8), dielectric breakdown occurs between the two, as shown in FIG.

It is divided into two arcs (12K) and (12IF).

When the end is divided into two in this way, current flows through the U-shaped protrusion (11) of the metal arc-extinguishing plate (13), so the divided ends (1213 and (12F) , metal arc-extinguishing plate +1:I is further driven by the magnetic field created by the current flowing through the U-shaped protrusion (13A), and the end (12G) in Fig. 5
and (12B), the arc is extended outward and extinguished at the current zero point, and the current is cut off.

[Problem that the invention seeks to solve]

The conventional electromagnetic contactor is configured and operates as described above, but when the interruption is repeated many times, only one side of the metal arc-extinguishing plate α3 is exposed to the heat of the high-temperature arc, so the metal arc-extinguishing plate a1 becomes heated. When subjected to stress, it deforms as shown in FIG. 6, and the metal arc-extinguishing plate 0 and the fixed contact (8) come into contact with each other, resulting in a problem that the breaking performance is extremely reduced.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a switch whose breaking performance does not deteriorate even if the breaking is repeated many times.

[Failure to solve the problem]

The switch according to the present invention includes a fixed contact joined to a fixed contact, a movable contact arranged opposite to the fixed contact and extending in the opposite direction to the fixed contact. It is equipped with a metal arc-extinguishing plate that faces the end face and extends from the movable contact toward the fixed contact, curves toward the contact @1, and extends in a direction in which the distance from the fixed contact gradually increases. .

[Effect]

The metal arc-extinguishing plate in this invention is curved toward the contact side 1 and extends in a direction that gradually increases the distance from the fixed contact, so even if it is deformed by repeated thermal stress due to arc heat,
To make it difficult for a metal arc-extinguishing plate to come into contact with a fixed contact.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. A switch according to an embodiment of the present invention is shown except for its essential parts.

Since it is the same as the conventional switch shown above, only the main parts are shown in FIG. The metal arc-extinguishing plate a3 has a movable contact (6
) facing the end surface (6B) of the movable contact (6) and extending in the direction of the fixed contact (81), contacts (6A), (8A) g
The protrusion (15A) is curved to form a mouth-shaped protrusion (15A), and extends in a direction in which the distance (X, Y in the figure) from the fixed contact element (i) 81 gradually increases. (13D) is metal arc extinguishing plate I
is the end of

Since the operation of the switch of the present invention is the same as that of the conventional switch shown above except for a part, the explanation will focus on the differences.

The arc generated between contacts (6A) and (8A) is separated, resulting in two arcs (12K) as shown in Figure 1.

(12F) is formed, and this end (12B), (1
21P) is driven by the magnetic field created by the current flowing through the metal arc-extinguishing plate 0, resulting in arcs (12G) and (12H).

When the interruption is repeated, only one side of the metal arc-extinguishing plate (13 is heated by (12FX) to (12H)) is heated, so the end of the metal arc-extinguishing plate receives thermal stress. Part (15
D) collapses onto the fixed contact +811311. However, in the present invention, the distance X in FIG. 1 is made larger than Y, so the end (13D)
It is difficult for the fixed contact (81) to come into contact with the fixed contact (81), and even if repeated breaking operations are performed, it is difficult to cause a phenomenon in which the breaking performance deteriorates due to contact between the fixed contact (15D) and the fixed contact [8]. can.

In the above embodiment, the metal arc-extinguishing plate Ql has an inverted plate (14
A), but it is obvious that the present invention can also be applied to a switch using a metal arc-extinguishing plate without the nine plates (14A).In addition, in the above embodiment, the present invention is mainly applicable to a switch using a metal arc-extinguishing plate without the nine plates (14A). Although we have explained the case, it may also be a molded circuit breaker or other switch (,
The same effects as in the above embodiment are achieved.

〔Effect of the invention〕

As described above, according to the present invention, there are a fixed contact joined to a fixed contact, a movable contact joined to a movable contact arranged opposite to the fixed contact and extending in the opposite direction to the fixed contact, and the movable contact. A metal arc-extinguishing plate is provided, which extends from the movable contact to the fixed contact facing the end face of the contact, and extends in a direction that curves toward the contact and gradually increases the distance from the fixed contact. This has the effect of making it difficult for the end of the metal arc-extinguishing plate to come into contact with the fixed contact even if the disconnection is repeated many times.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the main parts of a switch according to an embodiment of the present invention, Fig. 2 is a semi-spherical sectional view showing a conventional switch, and Fig. 3 is an enlarged view of the metal arc-extinguishing plate in Fig. 2. Perspective view shown as 4th
6 are explanatory diagrams illustrating the arc extinguishing process of the conventional switch shown in FIG. 2. In the figure, C6) is a movable contact, (6A) is a movable contact, (tsB) is an end face of the movable contact, and C8) is a fixed contact. (8A) is a fixed contact, (12I)) to (12
H) is completed, (I3 is a metal arc-extinguishing plate, (15A1 is a metal arc-extinguishing plate (σ-shaped protrusion of 11), (13D) is the end of the fixed contact. Note that the same reference numerals in the two figures Indicates the same or equivalent part.

Claims (1)

[Claims] A fixed contact joined to a fixed contact, a movable contact disposed opposite to the fixed contact and joined to a movable contact extending in the opposite direction to the fixed contact, and a movable contact facing an end surface of the movable contact. extending in the direction of the fixed contact from
A switch comprising a metal arc-extinguishing plate that is curved toward the contact and extends in a direction in which the distance from the fixed contact gradually increases.