JPH0797459B2 - Switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a switch for opening and closing an electric current, and more particularly to an arc extinguishing mechanism thereof.

[Conventional technology]

Examples of the switch to which the present invention is mainly applied include an electromagnetic contactor, a wiring connector, and a breaker.

FIG. 5 is a partial sectional view showing an example of a conventional electromagnetic contactor disclosed in, for example, Japanese Utility Model Publication No. 57-192647. In the figure, (1) is a mounting base made of plastic, (2)
Is a fixed core laminated with silicon steel plate on this mounting base,
(3) is a movable core that is installed opposite to the fixed core (2) and is laminated with a silicon steel plate similarly, and (4) is a tripping spring (not shown) between the movable core (3) and the fixed core (2). ), An operation coil that gives a driving force to attract the magnet against
Is a cross bar formed of plastic and having a square window, and the lower end of the cross bar holds a 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), (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 a contactor (8) is shown.

However, (9) is a terminal screw for connecting the main body of the electromagnetic contactor to an external circuit, (10) is a base to which the fixed contactor (8) is mounted, and (11) is a 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 FIG. 5,) are arranged in parallel above the fixed contact (8) so as to face the movable contact and in parallel with each other at a predetermined interval.

Due to the above configuration, when the operation coil (4) is demagnetized in this electromagnetic contactor, 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. In the state shown in the figure, the fixed contact (8
A) and the movable contact (6A) are separated and an arc (12) is generated between the fixed contact (8A) and the movable contact (6A). This arc (12) is an arc operation explanatory diagram of FIG. As shown in Fig. 7, the arc (12A) is attracted to the metal arc-extinguishing plate (13) and stretched like an arc (12A). (13c) of
Through (13f), the arc (12B) transferred to the fixed contact (8) is extinguished, and the current is cut off.

However, in such an arc extinguishing operation of the arc (12), a metal arc extinguishing plate (13) provided to improve the breaking performance.
Among them, the arc extinguishing plates (13a) and (13b) did not contribute to the arc extinguishing operation at all, and the interruption performance was inferior accordingly. It suffices to increase the arc extinguishing plates (13c) to (13f) that contribute to the arc extinguishing operation. For example, the contact separation distance is generally 4 to 20 mm.
Since the metal arc-extinguishing plates need to have a distance of 1 to 1.5 mm, it has been difficult to increase the number of metal arc-extinguishing plates that operate effectively in the switch having the conventional configuration.

[Problems to be solved by the invention]

Since the conventional switch has the above-mentioned structure, the number of metal arc-extinguishing plates that contribute to the arc-extinguishing operation cannot be increased and the breaking performance is insufficient.

The present invention has been made to solve the above problems, and an object thereof is to increase the number of metal arc-extinguishing plates that contribute to the arc-extinguishing operation and to obtain a switch with excellent breaking performance.

[Means for solving problems]

The switch of the present invention includes a movable contactor for joining movable contacts,
A fixed contact facing the movable contact is joined to a first piece parallel to the movable contact, and is connected to the first piece at a right angle, and is positioned further than the first piece with the movable contact as a reference. A fixed contact, which comprises a second piece and a third piece, which is continuously provided at a right angle to the second piece and extends beyond the second piece on the basis of the fixed contact, and is parallel to the movable contact. A metal arc-extinguishing plate, which is arranged at least partly on the side of the second piece farther from the first piece with reference to the movable contact, and arranged side by side from the vicinity of the third piece beyond the movable contact. It is equipped with.

[Action]

In the switch according to the present invention, the fixed contact is the first
And a second piece perpendicular to this,
Since the metal arc-extinguishing plates can be arranged in parallel on the second one side part and the number of metal arc-extinguishing plates contributing to the arc extinguishing can be increased, the breaking performance can be enhanced.

〔Example〕

Examples of the present invention will be described below. Since this embodiment is similar to the conventional switch shown in FIG. 5, the difference will be mainly described.

FIG. 1 is an enlarged side view of an essential part showing an embodiment of the present invention.
In the figure, (6A) is a movable contact joined to the movable contact (6), (8A) is a fixed contact facing the movable contact (6A), and (8B) is a fixed contact (8A) joined. One piece,
(8C) is a second piece (8C) that is connected to the first piece at a right angle and is located farther from the first piece (8B) with respect to the movable contact, and (8D) is the second piece (8C). A third piece that is connected to the first piece (8B) in parallel with the first piece (8B) and extends farther than the second piece (8C) with respect to the fixed contact (8A). The fixed contact (8) is the first, second and third
It consists of three pieces (8A) (8B) (8C) of
3) is a metal arc-extinguishing plate that is laminated at a distance from the vicinity of the movable contact side of the third piece (8D) of the fixed contactor (8), and is a part of this metal arc-extinguishing plate (13) ( 13g), (13h) and (13i) are arranged on the sides of the second piece (8C) of the fixed contactor (8) so that the end faces thereof face the second piece (8C).

Next, the operation of this embodiment will be described. Since it is similar to the case of the conventional switch shown in FIG. 5, the difference will be mainly described based on FIG.

The arc (12) generated between the movable contact (6A) and the fixed contact (8A) is driven by the magnetic metal arc extinguishing plate (13) (12
It becomes like A). The arc (12A) is driven by the magnetic metal arc extinguishing plate (13), and the fixed contactor (8) as in (12B).
The side arc foot moves to the second piece (8C) of the fixed contact (8) and is finally driven to the third piece (8D) of the fixed contact (8). , (12C), the arc is extinguished at the current zero point.

Therefore, in this embodiment, the number of metal arc-extinguishing plates (13) contributing to arc extinction can be increased as compared with the case of the conventional switch shown in the enlarged side view of the main part of FIG. The blocking performance can be improved.

As shown in the enlarged side view of the essential parts of another embodiment of the present invention in FIG. 2, the movable contact (6) has an arc horn (6B).
The arc foot on the movable contactor (6) is driven up to the tip of the arc horn (6B) by providing, so that the number of metal arc extinguishing plates (13) contributing to arc extinction can be further increased. Therefore, the breaking performance can be further enhanced.

Further, as shown in the enlarged side view of the essential parts of yet another embodiment of FIG. 3, the first piece (8B) of the fixed contactor (8) extends from the end on the anti-metal arc-extinguishing plate side to the first Provide a fourth piece (8E) that is connected to the piece (8B) at a right angle and is located farther from the first piece (8B) with respect to the movable contact, and is perpendicular to the fourth piece (8E). 5th piece (8F) extending continuously beyond the third piece (8D) in a continuous pattern, and fixed metal contact excluding the arc-extinguishing plate (13) If it is U-shaped,
Since the arc is driven by the magnetic field created by the current flowing through the first piece (8B), the breaking performance can be improved compared to the case of the embodiment shown in FIG. An external connection terminal portion is provided on the fifth piece (8F).

Furthermore, in the above embodiment, the case where the present invention is applied to the electromagnetic contactor has been described, but the present invention can also be applied to other switches such as a circuit breaker for wiring. An example of such a case is shown in the enlarged side view of the main part of FIG. In the figure, (14) is a rotating shaft, and the movable contactor (6) rotates about this rotating shaft (14). Reference numeral (15) is a flexible conductor for connecting the movable contactor (6) and the terminal, and the movable contactor (6) is opened to an operating mechanism (not shown). The arc extinguishing process of the arc (12) is the same as that in the first case, and therefore its explanation is omitted.

〔The invention's effect〕

As described above, according to the present invention, the movable contact that joins the movable contact, the fixed contact that faces the movable contact, and the first piece that is parallel to the movable contact and the second piece are A second piece, which is continuously arranged at a right angle and is located further than the first piece with the movable contact as a reference, and a second piece which is continuously connected at a right angle with respect to the second piece, and is further than the second piece with respect to the fixed contact. A fixed contact made of a third piece extending in the direction of the movable contact, and parallel to the movable contact, and at least a part of which is located on the side of the second piece and further than the first piece with reference to the movable contact. Since the arc extinguishing plate contributing to the arc extinguishing operation is increased by providing the metal arc extinguishing plate arranged in parallel over the movable contact from the vicinity of the third piece, the switch with excellent breaking performance is provided. There is an effect that can be obtained.

[Brief description of drawings]

FIG. 1 is an enlarged side view of an essential part showing an embodiment of the present invention, FIGS. 2 to 4 are enlarged side views of an essential part showing another embodiment of the present invention, and FIG. 5 is a conventional example. Partial sectional view, 6th
The figure is an enlarged side view of the main part of FIG. (6) …… Movable contact, (6A) …… Movable contact, (6B)…
… Arc horn, (8) …… fixed contact, (8A) …… fixed contact, (8B) …… first piece, (8C) …… second piece,
(8D) …… Third piece, (13) …… Metal arc extinguishing plate, (14)…
… Ark runner. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-119034 (JP, A) JP-A-59-108219 (JP, A) Actually opened 54-8667 (JP, U) Actually opened 58- 13616 (JP, U) Actual development 56-92343 (JP, U) Actual public 48-14600 (JP, Y1)

Claims (2)

[Claims] 1. A movable contact which joins a movable contact, a first piece which is joined to a fixed contact which opposes the movable contact and is parallel to the movable contact, and which is continuously provided at a right angle to the first piece. A second piece located on the metal arc-extinguishing plate side, which is located further away from the movable piece, is connected to the second piece at a right angle with respect to the second piece. Third extending to
A plurality of fixed contacts, each of which is parallel to the movable contactor, and at least a part of which is disposed at a side portion of the second piece, the first contact being further than the first contact, with reference to the movable contact. A switch equipped with a metal arc-extinguishing plate that is juxtaposed from the vicinity of one side of the contact beyond the movable contact. 2. The fixed contact is connected to the first piece at a right angle from the end of the first piece on the side of the anti-metal arc extinguishing plate, and is located further than the first piece with respect to the movable contact. 4 pieces and 4th
Has a fifth piece that extends continuously beyond the third piece and that extends beyond the third piece and faces the third piece, and the fifth piece is provided with an external conductor connecting terminal portion. The switch according to claim 1, wherein