JPH0215525A - Electromagnetic switching device - Google Patents

Abstract

PURPOSE:To prevent the breaking performance from lowering by forming the commutation board of an arc generated between fixed and moving contacts in the form of approximately a letter U as well as fixing both its ends to an arc box in the state of face contact. CONSTITUTION:A commutation board 3 is approximately a letter U formed with one of its ends fixed to an arc box 1 by means of a screw 34 and the other end inserted into the hold 35 formed in the arc box 1 so as to be fixed at the arc box 1 at both ends. As a result, the thermal stress generated by the arc in the state of severe repetition of current switching does not deform either end of the approximately U formed commutation board 3 so as to hold the constant space distance between grits 2 and the low temperature of the commutation board 3. The breaking performance is thus prevented from lowering.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic switchgear, and more particularly to an improvement in a commutator plate that commutates an arc generated between a fixed contact and a movable contact.

[Conventional technology]

Regarding the structure of a commutation plate that commutates the arc generated between the contacts, there is one shown in, for example, Japanese Utility Model Application Publication No. 46-13.

This is to insert and support the free end of the commutation plate into a recess provided in the arc box, thereby preventing the free end of the commutation plate from curving.

[Problem to be solved by the invention]

In the conventional configuration as described above, the free end of the commutation plate is simply inserted into the recess of the arc box and supported, so if the electromagnetic switching device repeatedly cuts off and the temperature rises, , the commutator plate swells toward the heating side due to thermal stress.

An example of this is shown in FIG. In the figure, (1) is an arc box, (2) is a grid, (3) is a commutation plate, and 34 is a screw.

As shown in FIG. 6, the conventional commutator plate (3) was configured such that the negative end was fixed with a screw (b), the other end was not fixed at all, and the free end was supported. Therefore, due to the thermal stress caused by the arc when the inching duty is repeated, the part A shown in Figure 6 is deformed by the thermal stress toward the grid (21 side) which is the heating side, and only touches the corner of the arc box as shown in Figure 1. There is a problem in that the effective number of grids is substantially reduced due to the deformation of the sea layer and contact with the grid (2), which reduces the arc-extinguishing performance.

This invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an electromagnetic switching device whose breaking performance does not deteriorate even after repeated cutting operations.

[Means to solve the problem]

In the electromagnetic switchgear according to the present invention, the commutation plate is formed into a substantially U-shape, and both ends thereof are fixed in surface contact with the arc box.

[Effect]

The electromagnetic switching device of this invention lowers the temperature and prevents thermal deformation by fixing both ends of the commutation plate in surface contact with the arc box. Explanation: Fig. 1 shows a front partial cross-sectional view of an embodiment of this fourth embodiment, and Fig. 2 shows a half-sectional side view of the same.

In Figures 1 and 2, (1) shows an arc extinguishing arc box made of a heat-resistant material, and a grid (2) and a commutator plate (3) made of magnetic metal are the phases of the electrical circuit that opens and closes. The arrangement is fixed according to the number. (4) is a crossper, (5) is a movable contact, (6) is a movable contact attached to both ends of the movable contact (5), (7) is a movable contact presser, (8) is a presser spring support, (9) is a contact spring, and 00 is a stopper. The contact spring (9) is compressed and fixed between the lower part of the stopper α1 and the lower end of the presser spring support (8), and the upper end of the presser spring support (8) and the movable contact spring support (7). The upper surface and the upper surface of the movable contact (5) and the lower surface of the movable contact holder (7) are assembled in contact with each other. Also, the above stopper Ql+″l:, cross/<-
(4) is inserted into the stopper hole (4a). 01
) indicates a baking tray, which has an open bottom as shown in the exploded perspective view of FIG. 3, and further has an opening (lla) on the side for pulling out an electromagnetic drive device, which will be described later. αtsu is a terminal fixed with a screw to the top of the bake αυ, α1 is a U-shaped fixed contact screwed to the top surface of the terminal α, and a fixed contact α→ is attached to the top surface. . αυ
is an arc runner fixed to the fixed contact 03, and 00 is an insulating barrier, which serves as electrical insulation between the four terminals of the terminal α, and is provided on the arc box (1) and the base 0υ. A portion thereof is inserted into a groove (not shown) and is fixed between the two.

(17) is a movable buffer rubber, and 0 is a movable iron core, which is connected and fixed to the lower part of the crossbar (4) by a movable iron core pin (A). OL3 indicates a fixed core, which is arranged to face the movable core α frame with a predetermined gap. (4) indicates an electromagnetic drive control device @ (hereinafter referred to as drive control device), which is inserted through the zero fixed cores,
The inside thereof includes a magnetic flux generating device 01) such as an electromagnetic coil. Further, as shown in a perspective view of the drive control device (a) seen from below in FIG. 4, a rail retaining piece (201) for forming a U-shaped recess (20a) is provided. Furthermore, 200) is a through hole into which the fixed iron core is inserted. Further, (A) is a fixed ML spring, which is attached to the lower part of the fixed iron core α and mainly functions to reduce the impact on the mounting panel surface (not shown) when the electromagnetic contactor is turned on. (c) indicates a fixed core pin, which is provided through the lower part of the fixed core 0@ as shown in FIGS. 2 and 3, and its both ends protrude from the fixed core 0. ing. A fixed buffer rubber (c) is installed through each end of the fixed iron core pin, and a fixed buffer rubber (c) is attached to each end of the fixed iron core pin.
A guide (A) is attached to cover C). guide(
C) is made of a material with low frictional resistance, and the fixed cushioning rubber (
A recessed portion (26a) of the guide is formed which is approximately equal to the outer diameter of (c).

@ indicates a rail plate, and in its center there are two parallel plates.
A book-shaped U-shaped rail (27a) is formed.

Also, there is a part of the rail stopper (271) at the back end of the rail.
) is formed. The rail plate @ is fastened and fixed to the base (lυ) with a tightening screw (C).The drive control device frame has a built-in ratchet frame shown in Figs. 1 and 4.Ratchet frame The ratchet recess (29a) is held in the longitudinal convex part (20d) of the drive control device cover so as to be able to move up and down, and is further biased downward by a return spring. is a cohesive process (2
9b) is formed, which is configured to be fitted into a holding hole (27C) provided in the rail plate (c). I3υ indicates a tripping spring, which is disposed between the lower end of the crossbar (4) and the top surface of the rail plate (A).
) is constantly biased upward. Reference numeral 02 denotes a mounting plate, which has a mounting hole for mounting the electromagnetic contactor on the mounting board surface (not shown), and is fixed to the lower side of the rail plate (manufactured by Co., Ltd.) with a screw wire.

(C) shows the auxiliary contact part, which is fixed to the side surface of the base αυ. The arc box (1) is fixed to the vane cover by screws, and the cross bar (4) is held and guided by the inner wall of the base 01) so that it can move up and down. (3) is formed into a substantially U-shape, one end of which is fixed to the arc box (1) with a screw (b), and the other end inserted into a hole (c) formed in the arc box (1). It is fixed to the arc box (1) at both ends. Note that (to) is the protrusion from the hole (c) of the commutation plate (3), and this protrusion (
7) is bent.

The electromagnetic switchgear according to Boshoku Kono Dormitory is constructed as described above, and its operation will be explained next.

In Figures 1 and 2, when a drive voltage is applied to the drive control device @(1), the magnetic flux generated by the drive control device (1) causes electromagnetic attraction between the movable core α frame and the fixed core 00. Cross spar (4) where force is generated and connected to movable iron core α ladle
moves downward against the tripping spring Gη, and the movable contact (6
) comes into contact with the fixed contact α. Since the core gap between the movable core α frame and the fixed core 01 is larger than the contact gap between the movable contact (6) and the fixed contact 0→, the crossbar (4) The contact position is also moved further downward, and the iron core is closed. Therefore, the contact spring (9) is compressed and deformed, and this spring pressure is applied to the movable contact (
5), and with a predetermined contact pressure, electrical continuity is established between the terminal α and the terminal α on the opposite side forming the same electrical path.

When the drive voltage applied to the drive control device (1) is removed, the electromagnetic attraction force between the movable core Qe and the fixed core α disappears, and the crossbar (4) becomes a compressed trip spring 0υ.
The contacts are moved upward by the urging force, and the contacts are separated. At this time, an arc occurs between the movable contact (6) and the fixed contact α→, but this arc flows from the movable contact (6) to the commutation plate (3), and from the fixed contact 04) to the arc runner 0.
0, and is further drawn into the grid (2) by the electromagnetic repulsion force caused by the arc current and the contact current, and is cooled and cut off to extinguish the arc.

As described above, by opening and closing the drive voltage of the drive control device, the electric circuit connected to the terminal Q2α is opened and closed.

By the way, as shown in Figure 6, the conventional commutator plate (3) used in this type of electromagnetic switchgear has one end fixed with a screw (2) and the other end left unfixed in a free state. It had been. Therefore, due to the thermal stress caused by the arc when the inching duty is repeated, the part A shown in Fig. 6 is deformed toward the grid (2) side, and by contacting the grid (2), the effective number of grids is substantially reduced. However, according to this Tsurumo device, the approximately U-shaped commutator plate can be damaged even by the thermal stress caused by the arc when severe current switching is repeated. Since both ends of the grid do not deform and the spatial distance between the grids can be kept constant, stable breaking performance can be achieved.

[Brief explanation of the drawing]

# Figures 1 to 5 are diagrams explaining one embodiment of the and.
Fig. 1 is a partial front sectional view, Fig. 2 is a half sectional side view of the device shown in Fig. 1, and Fig. 3 is a drive shaft that operates the movable iron core.
FIG. 4 is an exploded perspective view of the conventional drive device. In the figure, (1) is an arc box, (3) is a commutation plate, (5) is a movable contact, (6) is a movable contact, 03 is a fixed contact, and 0→ is a fixed contact. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A fixed contact attached to the fixed contact, a movable contact attached to the movable contact and performing an opening/closing action with the fixed contact, and an arc box that extinguishes an arc generated between the movable contact and the fixed contact. and a commutator plate for commutating the arc generated between the fixed contact and the movable contact, the commutator plate being formed into a substantially U-shape, and having both ends thereof fixed to the arc box. Features an electromagnetic switchgear.