JPH07123012B2 - Power switch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power switch for opening and closing the electric power of, for example, an electromagnetic contactor, a wiring connector, and a breaker, and more particularly to an arc extinguishing mechanism thereof.

[Conventional technology]

FIG. 5 is a sectional view of a conventional electromagnetic contactor disclosed in, for example, JP-A-60-119028.

In the figure, (1) is a mounting base made of plastic, (2) is a fixed iron core laminated with silicon steel plates on this mounting base, (3) is facing the fixed iron core (2), and the same silicon is used. A movable core laminated with steel plates, (4) an operation coil for applying a driving force for adsorbing the movable core (3) and the fixed core (2) against a trip spring (not shown),
Reference numeral (5) is a crossbar formed of plastic and having a square window, the lower end of which holds the movable iron core (3).
(6) is a movable contactor inserted in the square window of the crossbar (5) and held by a pressing spring (7), (6A) is a movable contact provided on the movable contactor (6), (6B) ) Is an arc horn provided at the tip of the movable contactor (6), (8)
Is a fixed contact that is provided so as to face the movable contact (6) and conducts current, (8A) is a fixed contact provided on this fixed contact (8), and (8B) is also this fixed contact. The terminal part of child (8) is shown. The arc horn (6
B) may be integrated with the movable contactor (6).

Further, (9) is a terminal screw for connecting the main body of the electromagnetic contactor to an external circuit, (10) is a base for mounting the fixed contactor (8), and (11) is an arc cover for covering the upper surface of the electromagnetic contactor. The metal arc extinguishing plate (13) made of a magnetic material for extinguishing the arc (12) generated between the fixed contact (8A) and the movable contact (6A) is provided on the metal arc extinguishing plate (13). As is clear from the figure, the fixed contact (8) faces the movable contact.
Cumulatively arranged in parallel above and at a predetermined distance from each other, (15-1) is a commutation plate. FIG. 6 is a perspective view of a conventional commutation plate (15-1), (15A)
Is a hole for inserting the crossbar (5).

Next, the operation will be described. FIG. 7 is an explanatory view for explaining the arc extinguishing process in the above-mentioned conventional electromagnetic contactor, in which (12A) to (12D) are arcs,
(13a) to (13f) are metal arc extinguishing plates. That is, in the above conventional electromagnetic contactor, when the operating coil (4) is demagnetized, the movable iron core (3) is separated from the fixed iron core (2) by a trip spring (not shown), and the crossbar (5) also moves to the fifth position.
Occupies the state shown in the figure, fixed contact (8A) and movable contact (6A)
And are separated and an arc (12) is generated between the fixed contact (8A) and the movable contact (6A). This arc (12) is attracted to the metal arc extinguishing plate (13) as shown in FIG. Ark (12A)
The legs of the arc (12B) disappear through the states of (12B), (12C), and (12D) and the commutation plate (15-
A new arc leg is generated in 1), the arc (12) finally becomes like an arc (12E), and is cooled and extinguished by the metal arc extinguishing plate (13).

[Problems to be solved by the invention]

Since the conventional power switch is configured as described above,
There is a problem that the arc foot is difficult to transfer, and the arc time at the time of breaking or breaking becomes long. That is, when the arc time becomes long, the arc energy becomes large, making it difficult to turn on or off a large current, and when the overcurrent is repeated or turned off, for example, the temperature of the movable contact becomes high and the movable contact becomes The crossbar to be held may be thermally deteriorated and the crossbar may be damaged.

The present invention has been made in order to solve such a problem, and an object thereof is to obtain a power switch which shortens the arc time at the time of turning on or off.

[Means for solving problems]

The power switch of the present invention is provided with an arc horn extending from the tip of the movable contactor toward the commutation plate, and the commutation plate extending between the arc horn facing part and the grid facing part of the commutating plate to the grid facing part. The arced gas distribution hole is provided in the portion.

[Action]

The arc foot is easily extinguished by allowing the arced gas to flow through the arced gas flow hole of the commutation plate according to the present invention.

〔Example〕

Hereinafter, the present invention will be described with reference to examples, but the invention is not limited thereto.

FIG. 1 is an explanatory view showing an arc extinguishing process of a power switch according to an embodiment of the present invention, and FIG. 2 is a perspective view of a commutation plate (15) according to the embodiment of the present invention. (15) is a commutation plate according to the embodiment of the present invention, and (15B) is an arced gas flow hole.

The power switch of one embodiment of the present invention is the same as the conventional power switch except for the difference in the structure of the commutation plate.

Next, the operation will be described. In FIG. 1, when the fixed contact (8A) and the movable contact (6A) are opened, an arc (12) occurs between the fixed contact (8A) and the movable contact (6A). This arc (12) is attracted to the metal arc-extinguishing plate (13) as shown in Fig. 1 and stretched like an arc (12A), (12B).
Through the state of (12C), the foot of the arc (12B) on the arc horn (6B) disappears, and a new foot of the arc is generated on the commutation plate (15). The arc (12) finally becomes the arc (12D). ), The metal arc extinguishing plate (13) cools and extinguishes the arc. However, since the commutating plate (15) is provided with the arced gas distribution hole (15B), the arced gas flows through the arrow. It flows out through this hole in the direction indicated by (P). Therefore, dielectric breakdown is likely to occur between the arc (12C) and the commutation plate (15). This is because the arced gas contains charged particles such as electrons and ions. As described above, in the embodiment of the present invention, since the dielectric breakdown can easily occur between the arc (12C) and the commutation plate (15), the legs of the arc on the arc horn (6B) are easily extinguished and the commutation plate (15) is easily erased. ) The legs of the arc are likely to occur on the top.

Therefore, the arc time is shortened and the arc energy is reduced, so that a large current can be turned on or off. Moreover, since the temperature rise of the movable contactor can be suppressed when the overcurrent is repeated or cut off, damage to the crossbar can be prevented.

FIG. 3 is a cross-sectional view of an electromagnetic contactor using the embodiment of the present invention, in which (11A) is an arced gas discharge hole, and the others are shown in FIGS. 1 and 2 and 5 to 6. It is similar to the figure. That is, as shown in the figure, the arc cover (11)
If an arced gas discharge hole (11A) is provided in the vicinity of the commutation plate of the arc arc gas, it becomes easier for the arced gas to flow through the arc gas flow hole (15B) of the commutation plate (15). The legs of the arc disappear more quickly, and the legs of the arc can be generated in the commutation plate (15) more quickly, and a greater effect can be exhibited.

FIG. 4 is an explanatory view showing an arc extinguishing process of wiring breakers and disconnectors using one embodiment of the present invention.
The rotating shaft (18) indicates a twisted wire, and the movable contact (6) and the commutation plate (15) are electrically connected via the twisted wire (18). Even in this case, it goes without saying that the same effects as those of the above-mentioned respective embodiments can be obtained.

Furthermore, it goes without saying that the present invention can be applied to power switches other than the above.

In the above embodiment, the case where the movable contact is provided with the arc horn has been described, but the desired purpose can be achieved even without the arc horn. In this case, the arc foot on the movable contact can be achieved. Disappears faster and arc legs develop faster on the commutation plate.

Although the fixed contact has a flat plate shape in the above embodiment, the intended purpose can be achieved even when the fixed contact has, for example, a U-shape.

〔The invention's effect〕

As described above, according to the present invention, the arc horn extending from the tip of the movable contactor toward the commutation plate is provided, and the commutation from the arc horn facing portion and the grid facing portion of the commutating plate to the grid facing portion is performed. By providing an arced gas flow hole in the plate part, the arc time at the time of breaking or cutting can be shortened, and, for example, the breaking performance can be improved and the crossbar can be prevented from being damaged during repeated overcurrent or breaking. A power switch can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an arc extinguishing process of a power switch according to an embodiment of the present invention, FIG. 2 is a perspective view of a commutation plate according to the embodiment of the present invention, and FIG. 4 is a sectional view of an electromagnetic contactor using one embodiment of the present invention, FIG. 4 is a sectional view showing an arc extinguishing process of wiring and disconnection using one embodiment of the present invention, and FIG. FIG. 6 is a sectional view of the electromagnetic contactor of FIG. 6, FIG. 6 is a perspective view of a conventional commutation plate, and FIG. 7 is an explanatory diagram showing an arc extinguishing process of a conventional power switch. (6) …… Movable contact, (6A) …… Movable contact, (8) …… Fixed contact, (8A) …… Fixed contact, (13) …… Metal extinguishing plate, (15) …… Rotation Flow plate, (15B) …… Arc gas distribution hole. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tokio Tateishi 5-1-14 Yada Minami, Higashi-ku, Nagoya-shi, Aichi Mitsubishi Electric Corporation Nagoya Works (72) Inventor Shizutaka Nishisako 5 Yada-minami, Higashi-ku, Nagoya-shi, Aichi 1-14, Mitsubishi Electric Co., Ltd., Nagoya Works (72) Inventor Harumi Hiraki, 5-1-1-14, Yada Minami, Higashi-ku, Nagoya-shi, Aichi Prefecture Mitsubishi Electric Co., Ltd. (56) Reference JP-A-59-111209 (JP, A)

Claims (1)

[Claims] 1. A fixed contact, a fixed contact joined to the fixed contact, a movable contact facing the fixed contact and capable of coming into contact with and separating from the fixed contact, a movable contact provided with the movable contact, and both of the above. A power switch having a metal arc extinguishing plate for extinguishing an arc generated between the two contacts when the contacts are opened, and a commutation plate for transferring the legs of the arc, and a hole provided in the commutation plate. In, the arc horn extending from the tip of the movable contact toward the commutation plate is provided, and the arc commutation plate extends from between the arc horn facing portion and the grid facing portion of the commutating plate to the grid facing portion. An electric power switch characterized in that an arced gas distribution hole is provided in a part thereof.