JPS61193311A - 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 a switch that switches on and off current, and particularly to an arc extinguishing mechanism thereof. The main application of the present invention is the switch handle.

Examples include electromagnetic contactors and circuit breakers.

[Conventional technology]

FIG. 2 is a partial sectional view showing an example of a conventional electromagnetic contactor disclosed in, for example, Japanese Patent Application No. 58-2011605. Note that since the conventional electromagnetic contactor is bilaterally symmetrical, FIG. 2 shows a cross section of one side. (1) is a plastic (1) r: mounting base molded with lastic, (2) is a mounting base (1)
A fixed core with a silicon steel plate laminated on top, (3) a movable core installed opposite the fixed core (2) and also laminated with silicon steel plates, and a movable core (4) with a movable core (3) and a fixed core (
(2) is an operating coil that applies a driving force to attract the and the other against a tripping spring (not shown); (5) is a crossbar made of plastic and has a square window; I keep all of them. (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 flow.

(8A) is a fixed contact provided on the fixed contact (8).

(8C) also shows the terminal portion of the fixed contactor (8). Therefore, (9) is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, aI is the base on which the fixed contact (8) is attached, and (lυ is a cover that covers the top surface of the electromagnetic contact, inside which is the fixed contact. (8A) and the movable contact (6A), a magnetic metal arc extinguishing plate α mark is provided to extinguish the arc α3ffi.
- The mounting manner of the fixed contact (8) and fixed contact (8A) is shown. A cutout end Q4) is provided in a portion of the metal arc-extinguishing plate adjacent to the fixed contact (8) through which the metal arc-extinguishing plate is inserted.

In the conventional electromagnetic contactor configured as described above, 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 is separated from the fixed core (2). (5) also occupies the state shown in Figure 2, and the fixed contact (8
A) and the movable contact (6A) are separated and the fixed contact (8A)
An arc 02 occurs between the contact point and the movable contact (6A), but this arc 0 is extinguished by the metal arc-extinguishing plate α3) at the current zero point, and the current is interrupted.

The arc extinguishing process at the zero arc point in such a conventional electromagnetic contactor will be explained in more detail with reference to FIG. 4, which shows a cross section of the arc extinguishing chamber. The arc zero is attracted to the magnetic metal arc-extinguishing plate I and is stretched like an extended arc (12A). Since the arc voltage increases when the arc is stretched like an extended arc (12A), there is ) dielectric breakdown occurs between the

Arc (12A) has two arcs (12B) and (12C
), and two arcs (12B
).

(12C) is extinguished.

[Problem that the invention seeks to solve]

As described above, conventional switches generate arcs but fail to extinguish them, which poses a problem in that it is difficult to interrupt large currents.

The present invention was made to solve the above-mentioned problems, and its entire purpose is to provide a switch that can easily interrupt large currents.

[Means for solving problems]

In order to obtain a switch that interrupts a large current, the switch according to the present invention has two movable contacts joined to a movable contact and two fixed contacts facing the movable contacts. Equipped with fixed contacts.

A diode is electrically connected between one of the fixed contacts and the movable contact.

[Effect]

The switch according to the present invention commutates the arc generated between one of the contacts to a diode, and when the current passes through the zero point and is about to reverse, the diode blocks the spot current and interrupts the arc.

[Embodiments of the invention] FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

Note that parts having the same functions as those of the conventional example shown in FIG. 2 are given the same symbols, and explanations thereof will be omitted. (l!9 is a diode, ae is a flexible conductor, aη is a conductor, and the diode is a movable contact (6)
A conductor aη and a flexible conductor (lf
9'e. Note that the arc extinguishing chamber is not symmetrical, so the left fixed contact (8') and the fixed contact (8')
A, left movable contact (6 A, left metal arc extinguishing plate (1)
Three and left arcs (12'), (12A'), (
i2B').

(120 pieces are also shown.

A complete explanation of the arc extinguishing process of the present invention constructed as above is as follows. The arcs (12) (12') generated between the movable contacts (6A) (6A') and the fixed contacts (8A), respectively, are caused by the magnetic metal arc extinguishing plate (13).
.

(13') and extends the arc (12A), (12
It is stretched as shown in A'). Fixed contact (8), since the arc voltage will be high when stretched in this way.

(8') and the metal arc-extinguishing plates (15), (13'), and the notch ends (14) of the metal arc-extinguishing plates (13), (13')
, (1'4') and the movable contacts ((SA), ((SA')).

Arcs (j2A), (12A, /) Fi each have two arcs (12B), (12B/) and (12C), (1
2C'), and arc extinction is completed at the current zero point. In this embodiment, the diode 04 is inserted between the movable contact (6) and the fixed contact (8) on the right, so the movable contact (6A) on the right and the fixed contact (8) on the right )
The current in the arcs (12B) and (12C) between the diodes a! easily translocated to 9.

The current flows through the fixed contact (8) and the diode α9. The flow passes through the movable contact (6), the metal arc-extinguishing plate (13'), and the fixed contact (8') in this order. When the current reaches zero point and attempts to reverse, the current flow is blocked by the α diode.

The cutoff is complete.

In the above description, the present invention was applied to an electromagnetic contactor, but it may also be applied to other switches such as molded circuit breakers.

[Effects of the invention As is clear from the above description, according to the present invention.

Since a diode is electrically connected between one of the fixed contacts and the movable contact, a remarkable effect is that the interrupting performance can be improved.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a partial sectional view showing a conventional electromagnetic contactor, Fig. 3 is an enlarged perspective view of main parts showing the arc extinguishing chamber in Fig. 2, FIG. 4 is an explanatory diagram for explaining the arc extinguishing operation in a conventional electromagnetic contactor. (6)...Movable contact, (6A), (6A')・
...Movable contact. (8A), (8A')...Fixed contact, (8
), (8')...Fixed contact. Q51...Diode, Ql...Flexible conductor, aη
...Conductor The same reference numerals in each figure indicate the same parts.

Claims (1)

[Claims] A movable contactor to which two movable contacts are joined, and two fixed contacts to which two fixed contacts facing the movable contacts are joined, between one of the fixed contacts and the movable contactor. A switch characterized in that a diode is electrically connected to.