JPH03230435A - Switch - Google Patents

Abstract

PURPOSE:To improve breaking function, and to effectively cool a hot gas by arranging a plate-shaped metallic arc-extinguishing grid in a preset form, perpendicular to the direction that a movable contact is opened. CONSTITUTION:A plate-shaped metallic arc-extinguishing grid is arranged with its plate perpendicular in the direction that a movable contact is opened, while the grid is divided into at least two, in parallel in the direction that the arc generated at the time of opening is proceeded, or in radial directions. For example, the metallic arc-extinguishing grid is formed with the divided metallic grid 13a held by a holding plate 14, and its plate part is arranged perpendicular to the moving direction of a movable contact 6a. An arc 12 generated by the opening of the contact is moved to the arc-extinguishing grid 13a, takes a form 12a, and passes through many arc-extinguishing grids 13a. The moving arc 12a is cooled by the arc-extinguishing grid 13a, and is extinguished thereby. A hot gas is cooled by the divided metallic grid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switch that switches on and off current.

[Prior art] As a conventional switch, for example, the Japanese Utility Model Publication No. 63-42447
An electromagnetic contactor as shown in the partial sectional view of FIG. 7 in the publication is well known. Since this electromagnetic contactor is bilaterally symmetrical, only the right side is shown in cross section.

In the figure, (1) is a mounting base made of plastic, etc., (2) is a fixed core laminated with silicon steel plates on the mounting base (1), and (3) is a fixed core placed opposite to the fixed core (2). , a movable iron core laminated with silicon steel plates, (4
) is an operating coil that applies a driving force to attract the movable core (3) and fixed core (2) against a spring (not shown), and (5) is a cross superper made of plastic and having a square window. , a movable iron core (3) is held at its lower end. (6) is inserted into the corner window of the cross superper (5) and held by a push spring (7). (6) is inserted into the corner window of the crossbar (5) and presses the spring (7).
(6a) is a movable contact joined to the 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 joined to this fixed contact (8), and (8b) is a terminal portion of this fixed contact (8). (9) is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, and (lO) is a base for attaching the fixed contact (8).

(11) is a cover that covers the top surface of the electromagnetic contactor, and inside it is a magnetic plate-shaped metal for extinguishing the arc (I2) that occurs between the fixed contact (8a) and the movable contact (6a). An arc extinguishing grid (13) is provided and serves as an arc extinguishing chamber. As is clear from the figure, this metal arc-extinguishing grid (13) is placed facing the movable contact (6), above and parallel to the national contact (8), and cumulatively arranged at a predetermined distance from each other. ing.

The conventional switch has the above configuration, and its operation will be explained below.

In the electromagnetic contactor shown in FIG. 7, 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)
) also occupies the upper position shown in the figure, and the fixed contact (8a) and the movable contact (6a) are separated and the fixed contact (8a) and the movable contact (
6a), this arc (12) is attracted to the magnetic metal arc-extinguishing grid (13) and becomes an arc (12a) as shown in Figure 7. , the metal arc-extinguishing grid (13) cools and cuts off the current.

[Problems to be solved by the invention] Since the conventional switch is configured as described above, there is a problem that the arc length cannot be made sufficiently long and the breaking performance is poor, and the cooling of the hot gas is also difficult. There was an issue of not being able to do enough.

This invention was made in order to solve the above-mentioned problems, and aims to obtain a switch that has excellent shutoff performance and can efficiently cool hot gas.

[Means for Solving the Problems] A switch according to the present invention includes a fixed contact to which a fixed contact is joined, a movable contact to which a movable contact that comes into contact with and separates from the fixed contact is joined, and a movable contact of this movable contact. In a switch equipped with a plate-shaped metal arc-extinguishing grid arranged perpendicular to the opening direction, the L2 plate-shaped metal arc-extinguishing grid is arranged parallel to the traveling direction of the arc generated when the movable contactor is opened. or radially divided into at least two parts.

[Operation] The switch according to the present invention improves the breaking performance by increasing the length of the arc and raising the arc voltage using the divided metal arc-extinguishing grid. Furthermore, since the surface area of the divided metal arc-extinguishing grid is large, the cooling effect of hot gas when an arc occurs is also increased.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a diagonal m-view of a metal arc-extinguishing grid. In the figure, (13a) is a divided metal arc extinguishing grid, (14)
is a holding plate that holds the divided arc extinguishing grid (13a).

FIG. 2 is a partial sectional view of the electromagnetic contactor showing the relative positions of the divided metal arc-extinguishing grid (13a) and the contacts.

FIG. 3 is a side view seen from direction A in FIG. 2.

(6) is a movable contact, (6a) is a movable contact joined to the movable contact (6), and (8) is a stationary contact that is provided opposite to the movable contact (6) and conducts current. Contact, (8a
) is a fixed contact joined to the fixed contact (8).

(12) operates the movable contactor (6), and the contact (6a)
, (8a) The arc that occurs when the gap is opened, (
12b) shows an arc that has migrated to the divided metal arc-extinguishing grid (13a) after the arc (12) has occurred.

In the partial cross-sectional view of the electromagnetic contactor configured as shown in Figure 2 above, when the movable contactor (6) opens, an arc (12
) occurs between the movable contact (6a) and the fixed contact (8a). Thereafter, the arc (12) transfers to the divided metal arc extinguishing grid (13a) and becomes a transitional arc (12a).

The transition arc (12a) connects from the movable contact (6) to the fixed contact (8) across a large number of divided metal arc extinguishing grids as shown in FIG. Since the length of the transition arc (12a) becomes longer than that of the metal arc extinguishing grid (13), the arc voltage increases. The transitional arc (12a) is then cooled and extinguished by the divided metal arc extinguishing grid (13a). The hot gas is also cooled by the segmented metal arc extinguishing grid.

In the above embodiment, the metal arc-extinguishing grids (13a) divided evenly were provided, but as shown in FIG. 4, the divided metal arc-extinguishing grids (13a) may be arranged alternately. Alternatively, as shown in FIG. 5, the divided metal arc-extinguishing grids (13a) may be arranged with arbitrary widths. Alternatively, a segmented arc-extinguishing grid (13a) with a short portion as shown in FIG. 6 may be arranged. Further, arc extinguishing grids (13a) divided radially may be arranged.

Furthermore, although the second embodiment describes the case of an electromagnetic switch, it may also be a circuit breaker, disconnector, or other switch.
The same effects as in the above embodiment are achieved.

[Effects of the Invention] As described above, according to the present invention, the metal arc-extinguishing grid is divided into at least two parts parallel to the traveling direction of the arc generated when the contacts are opened or radially. Therefore, it has the effect of improving the shutoff performance and cooling the hot gas.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a divided metal arc-extinguishing grid according to an embodiment of the present invention, and FIG. 2 is a partial new view of an electromagnetic contactor showing the relative positions of the divided arc-extinguishing grid and the contacts. 3 is a side view of FIG. 2 viewed from direction A; FIGS. 4, 5, and 6 are perspective views of divided arc-extinguishing grids showing other embodiments of the present invention; and FIG. is a partial cross-sectional view of a conventional electromagnetic contactor. In the figure, (6) is a movable contact, (6a) is a movable contact,
(8) is a fixed contact, (8a) is a fixed contact, (12) is an arc, (12a) is a transitional arc, (13a) is a divided metal arc extinguishing grid, and (14) is a holding plate. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A fixed contact to which a fixed contact is joined, a movable contact to which a movable contact that comes into contact with and separates from the fixed contact is joined, and a plate-shaped metal arc extinguisher arranged perpendicular to the opening and opening direction of the movable contact. A switch equipped with a grid, characterized in that the plate-shaped metal arc-extinguishing grid is divided into at least two parts parallel to the traveling direction of the arc generated when the movable contact is opened or radially. switch.