JPH061650B2 - Opener - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a switch for opening and closing an electric current, and more particularly to an arc extinguishing mechanism thereof. The main applicable switch of the present invention is an electromagnetic contactor or a wiring. You can mention the breaker.

[Prior art]

First, an example of a conventional electromagnetic contactor will be described with reference to FIG. Since the conventional electromagnetic contactor is symmetrical,
The figure shows its one-sided cross section. In Fig. 1, (1) is a mounting base made of plastic, (2) is a fixed core laminated with silicon steel plate on this mounting base, and (3) is installed opposite to the fixed core (2). Similarly, a movable iron core laminated with a silicon steel plate, (4) an operation coil for applying a driving force that attracts the movable iron core (3) and the fixed iron core (2) against a trip spring (not shown), ( 5) 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 contact which is inserted into the square window of the crossbar (5) and is held by a pressing spring (7), (6a) is a movable contact provided on the movable contact (6), 8) is a fixed contact provided to face the movable contact (6), and carries a current, (8a) is a fixed contact provided on this fixed contact (8), and (8c) is also this fixed contact. The terminal portion of the fixed contact (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 for mounting the fixed contactor (8), (11) is a cover for covering the upper surface of the electromagnetic contactor, and (11a ) Is a side wall of the cover (11), and inside the cover (11), a magnetic arc extinguishing plate (magnetic material) for extinguishing the arc (12) generated between the fixed contact (8a) and the movable contact (6a) is provided. 13) is provided, and FIG. 2 shows a mounting mode of the metal arc-extinguishing plate (13), the fixed contact (8) and the fixed contact (8a). Fixed contact (8) of this metal arc-extinguishing plate (13)
A notch end (14) for inserting this is provided at a position close to.

Because of the above configuration, in this 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 , Occupy the state shown in Fig. 1, fixed contact (8a)
The movable contact (6a) and the fixed contact (8a) and the movable contact (6a).
An arc (12) is generated between the arc and (a), but this arc (12) is extinguished at the current zero point by the metal arc extinguishing plate (13), and the current is cut off or cut off.

The arc extinguishing process of the arc (12) in this conventional electromagnetic contactor will be described in more detail with reference to FIG. 3 showing a cross section of the arc extinguishing chamber.
Arc (12) generated between moving contact (6a) and fixed contact (8a)
Is attracted to the magnetic arc extinguishing plate (13) of the magnetic substance and is extended (12
It is stretched as in a). Since the arc voltage increases when it is extended like this extension arc (12a), it is between the movable contact (6) and the metal arc-extinguishing plate (13), and the metal arc-extinguishing plate.
Dielectric breakdown occurs between the notch end (14) of (13) and the fixed contact (8), the arc (12a) is divided into two arcs (12b) and (12c), and two currents are generated at the current zero point. Arcs (12b) and (12c) are extinguished. However, if the position where the generated arc moves and finally stays is the tip of the contactor or arc extinguishing plate,
It is difficult to extinguish the arc due to the concentration of the electric field, and it is difficult to remove the heat of the arc generated at the tip, so it has been a major cause of deterioration in the combing and breaking performance. Further, the heat of the arc causes the side wall (11a) of the cover (11).
However, there was a drawback that it was damaged and had holes, which caused a short circuit between phases.

[Outline of the present invention]

The present invention has been made for the purpose of improving the breaking performance of a switch and preventing an inter-phase short circuit in order to eliminate the above-mentioned drawbacks. A movable contactor to which a movable contact is joined and a stationary contact facing the movable contact are provided. A first piece to which the contacts are joined,
A second piece provided at a right angle to the first piece and located farther from the first piece with respect to the movable contact, and a second piece provided at a right angle to the second piece and A fixed contact which is provided in parallel with the first piece and which is composed of three pieces of a third piece extending to the side opposite to the fixed contact;
A first piece that is erected parallel to the opening direction of the movable contact, faces the tip of the movable contactor, and faces the second piece of the fixed contactor face to face. A metal arc extinguishing plate, which is provided at a right angle to the first piece and includes a second piece that faces the surface of the movable contactor to which the movable contact is not joined, the metal extinguishing plate. The gap length between the first piece of the plate and the second piece of the fixed contact is made smaller than the gap length between the tip of the metal arc extinguishing plate and the third piece of the fixed contact, and the metal arc extinguishing is performed. The gap length between the second piece of the plate and the surface of the movable contactor where the movable contact is not joined is smaller than the distance between the tip of the movable contactor and the first piece of the metal arc-quenching plate. Is characterized by.

Example of Invention

The present invention will be described below based on the embodiment shown in FIG. The switch of this embodiment has a fixed contact (8) and a metal arc-extinguishing plate.
Except for (13), the structure is the same as the conventional example shown in FIG. 3, and the main part thereof is shown in FIG. In FIG. 4, (8b) is the first piece of the metal arc-extinguishing plate (13) to which the fixed contact (8a) is joined. (8c) is provided at a right angle to the first piece (8b),
Also, the second piece (8d) is located at a distance from the first piece (8b) with respect to the movable contact, and (8d) is provided at a right angle with respect to the second piece (8c) and is The third piece is provided in parallel with the first piece (8b) and extends to the side opposite to the fixed contact, and the fixed contact (8) is the above-mentioned first piece (8b) and second piece (8). 8
It consists of three parts, c) and the third piece (8d). On the other hand, the metal arc-extinguishing plate (13) is erected in parallel in the opening direction of the movable contact (6a) so as to face the tip of the movable contactor (6) and the second contact of the fixed contactor (8). The first piece (13a) facing the piece (8c) of the
And a second piece (13a) facing in plan view the surface of the movable contact (6) to which the movable contact (6a) is not joined,
Further, in FIG. 4, X ₁ is configured to be smaller than Y ₁ , and X 2 is configured to be smaller than Y 2.

According to Fig. 4, the arc (12) has a fixed contact (8a) and a movable contact (6a).
The process from arcing to arc extinction between the fixed contact (8a) and the movable contact (6a) is described below.
2) First, the magnetic arc extinguishing plate (13) attracted to the arc
It is extended as in (12a) and the arc voltage is increased. As a result, dielectric breakdown occurs and the arc (12a) becomes two arcs.
It is divided into (12b) and (12c). Thus, when the arc (12a) is divided into two arcs, a current flows through the metal arc-extinguishing plate (13), so that the arcs (12b) and (12c) thus divided are separated by the metal arc-extinguishing plate (1).
It is further driven by the magnetic field created by the current flowing in 3) and is set to X1 <Y1 and X2 <Y2 in FIG. 4, so it is moved outward like arcs (12d) (12e). .
And the arc (12e) is the first piece (13) of the metal arc-quenching plate (13).
The outward driving force of the magnetic field generated by the current flowing in a) and the inward driving force of the magnetic field generated by the current flowing in the second piece (8c) of the fixed contact (8) are balanced, It stays between the arc extinguishing plate (13) and the second piece (8c) of the fixed contact (8) and is extinguished at the current zero point. Similarly, the arc (12d) is the magnetic field created by the driving force outward by the magnetic field created by the current flowing through the second piece (13b) of the metal arc-quenching plate (13) and the current created by the current flowing through the movable contact (6). In balance with the inward driving force by the magnet, the magnet stays between the back surface of the movable contactor (6) and the second piece (13b) of the metal arc extinguishing plate (13) and is extinguished at the current zero point.

Since the arc extinguishing is performed as described above, in the electromagnetic contactor to which the present invention is applied, the electric field is not concentrated and the metal arc extinguishing plate (13) and the movable contactor (6) or the fixed contact with good heat conduction are provided. Child (8)
The arc driven by the flat plate part of the plate is extinguished, the electric field is concentrated, and the arc does not occur at the tip of the metal arc-extinguishing plate (13), which has poor heat conduction. Can be demonstrated.

Another embodiment of the present invention is shown in FIG. In the embodiment of FIG. 5, the third piece (13c) and the fourth piece (13c) extending from the side of the first piece (13a) of the metal arc-extinguishing plate (13) to the contact side and facing each other ( 13
Fixed arc (8a) and movable contact (6
Since it encloses the arc space between a), the cover (11)
Since it is possible to prevent arc heat damage to the side wall (11a) of the above, it is possible to prevent a phenomenon that the side wall (11a) has a hole at the time of repeated opening and closing and a short circuit occurs between phases.

Further, in the above description, only an example of the case where the present invention is applied to a switch that opens and closes a contact by a magnet, that is, an electromagnetic contactor is described, but this is used for wiring or disconnection. Obviously, it can also be applied to other switches.

〔The invention's effect〕

As described above, according to the present invention, the movable contactor to which the movable contact is joined, the first piece to which the fixed contact facing the movable contact is joined, and the first contact piece are formed at right angles to the first piece. A second piece that is provided and is located farther from the first piece with respect to the movable contact; and a second piece that is provided at a right angle to the second piece and is provided in parallel with the first piece. And a fixed contact made up of three pieces of a third piece extending to the side opposite to the fixed contact, and standing upright in parallel in the opening direction of the movable contact and facing the tip of the movable contact. In addition, the second piece of the fixed contact is face-to-face with the first piece, and the movable contact of the movable contact is not joined to the first piece provided at a right angle to the first piece. A metal arc extinguishing plate composed of a second piece facing each other on the face, and the metal arc extinguishing plate and the fixed contact The gap length between the two arc-extinguishing plates is smaller than the gap length between the metal arc-extinguishing plate and the third piece of the fixed contact so that one of the divided arcs has a gap between the metal extinguishing plate and the fixed contactor. So that it stays between the two pieces and is extinguished,
From the distance between the tip of the movable contactor and the first piece of the metal arc-quenching plate, the gap length between the second piece of the metal arc-quenching plate and the surface of the movable contactor where the movable contact is not joined is The other arc, which has been made smaller and cut off, stays between the back surface of the movable contactor and the second piece of the metal arc-extinguishing plate to be extinguished, so that the electric field is not concentrated and heat conduction is good. The arc driven by the metal arc extinguishing plate and the flat part of the movable contact or fixed contact may be extinguished and the electric field may concentrate, resulting in arcing at the tip of the metal arc extinguishing plate, which has poor heat conduction. Since it is eliminated, there is an effect that extremely excellent blocking performance can be exhibited.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a conventional electromagnetic contactor, and FIG.
FIG. 3 is an enlarged view of a main part showing an arc extinguishing chamber of the figure, FIG. 3 is an explanatory view for explaining an arc extinguishing operation in a conventional electromagnetic contactor, and FIG. 4 is an arc extinguishing plate according to an embodiment of the present invention. FIG. 5 is a sectional view for explaining the arc extinguishing operation, and FIG. 5 is an explanatory view showing another embodiment of the present invention. (6): Moving contact, (6a): Moving contact, (8): Fixed contact,
(8a): fixed contact, (8b): first piece of the fixed contact (8), (8c): second piece of the fixed contact (8), (8d): the fixed contact ( The third piece of 8), (12): arc, (13): metal arc-quenching plate, (13a) (13b) (13c) (13d): first, second, third, fourth metal arc-quenching plate, respectively. Piece of. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A movable contact to which a movable contact is joined, and a first piece to which a fixed contact facing the movable contact is joined.
A second piece provided at a right angle to the first piece and located farther from the first piece with respect to the movable contact, and a second piece provided at a right angle to the second piece and A fixed contact which is provided in parallel with the first piece and which is composed of three pieces of a third piece extending to the side opposite to the fixed contact;
A first piece that is erected parallel to the opening direction of the movable contact, faces the tip of the movable contactor, and faces the second piece of the fixed contactor face to face. A metal arc extinguishing plate, which is provided at a right angle to the first piece and which is opposed to the surface of the movable contactor to which the movable contact is not joined, the metal arc extinguishing plate. The gap length between the first piece of the arc plate and the second piece of the fixed contact is made smaller than the gap length between the tip of the metal arc extinguishing plate and the third piece of the fixed contact, and The gap length between the second piece of the arc plate and the surface of the movable contactor where the movable contact is not joined is made smaller than the distance between the tip of the movable contact and the first piece of the metal arc extinguishing plate. Switch that is characterized.