JPH0157450B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electromagnetic switching device.

This type of device will be explained below with reference to the drawings.

1, 2, and 3, reference numeral 1 indicates an arc extinguishing arc box made of a heat-resistant material, a grid 2 made of magnetic metal, and a commutator plate 3.
are arranged and fixed in accordance with the number of phases of the electrical circuit to be opened and closed. 4 is a cross bar, 5 is a movable contact, 6 is a movable contact attached to both ends of the movable contact 5, 7 is a movable contact holder, 8 is a square window provided in the cross bar 4, and 9 is a contact spring. It is. This contact spring 9
is compressed and inserted into the corner window 8 of the crossbar 4. 11 is a base made of electrical insulator;
12 is a terminal fixed to the top of the base 11 with a screw, 13 is a U-shaped fixed contact screwed to the top surface of the terminal 12, and the fixed contact 1 is mounted on the top surface.
4 is installed. 15 is an arc runner fixed to the fixed contact 13.

The movable contactor 5 is connected via a movable contactor spring 9 to a well-known electromagnetic drive device incorporated therein.

Such contact mechanisms are provided symmetrically with respect to the A-A cross section, and are arranged corresponding to the number of phases of the electrical circuits that open and close in the direction orthogonal to the plane of the paper.

2 is a perspective view schematically showing the commutation plate 3, movable contact 5, and movable contact 6, which are the main parts of FIG. 1, and also the fixed contact 13, fixed contact 14, and arc runner in FIG. When the part 15 is enlarged, it looks like Fig. 3 a and b.

In such an electromagnetic switching device, when the fixed contact 14 and the movable contact 6 are opened, one end of the arc generated between the two contacts is transferred from the movable contact 6 to the commutation plate 3 via the movable contact 5. On the other hand, the other end is transferred from the fixed contact 14 to the arc runner 15. The other end of the transferred arc moves toward the end on the arc runner 15, and finally the arc is extinguished by the grid 2 between the vertical part of the arc runner 15 and the commutation plate 3 facing it. .

The conventional power switchgear operates as described above, but as shown in Fig. 1, there is a space 16 between the movable contact 5 and the commutator plate 3, which has the disadvantage that the arc extinguishing chamber becomes large. It had

An object of the present invention is to reduce the size of the arc extinguishing chamber of a power switchgear by eliminating the space 16.

FIG. 4 shows the shape of a commutation plate according to an embodiment of the present invention. As shown in FIG. 4, the commutation plate 3 of the present invention has a notch (second hollow part) 3b on the surface 3a facing the grid 2, and the movable contact 5 and the movable contact 3 are provided in the notch 3b. It is configured so that the contact 6 can enter therein. In FIG. 4, the legs of the arc generated at the movable contact 6 are driven by the magnetic field created by the current flowing through the movable contact 5 and the fixed contact 13, and are transferred to the leg 3c of the commutator plate 3 and to the grid facing surface 3a. Alternatively, it is driven from the movable contact 6 via the movable contact 5 to the grid facing surface 3a without passing through the leg portion 3c. Thereafter, the arc is extinguished by grid 2. The arc is extinguished in this way. In the power switchgear according to one embodiment of the present invention, a notch 3b is provided in a part of the grid-facing surface 3a of the commutation plate 3, and due to the presence of this notch 3b, the movable contact 5 Since the movable contact 6 can be placed close to the grid 2, the space 16 in FIG. 1 can be eliminated or reduced as in the conventional power switchgear, and the arc extinguishing chamber can be made smaller. can.

According to the present invention described above, the power switching device is made smaller by providing the second hollow portion into which the movable contact can fit into the surface of the commutation electrode facing the deion grid.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing a conventional power switchgear, Fig. 2 is a perspective view schematically showing the commutation plate shown in Fig. 1, and Fig. 3a is a schematic diagram showing the arc runner shown in Fig. 1. The plan view shown in FIG. 3b is A- in FIG. 3a.
FIG. 4 is a cross-sectional view showing section A, and is a structural diagram schematically showing a commutation plate of a power switchgear according to an embodiment of the present invention. In the figure, 2 is a bridge, 3 is a commutation plate, and 3a
3b is a notch portion (second hollow portion), 3c is a leg portion, 5 is a movable contact, 6 is a movable contact, 13 is a movable contact, and 14 is a movable contact. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A fixed contact joined to a fixed contact, a movable contact joined to a movable contact and provided opposite to the fixed contact, and a deion grid provided in a direction perpendicular to the surface of the fixed contact. , having at least a surface facing the deion grid and a surface facing the surface of the fixed contact, and a first hollow portion into which at least a portion of the movable contact can fit into the surface facing the surface of the fixed contact. A power switching device comprising a commutating electrode, wherein a second hollow portion into which the movable contact can fit is provided on a surface of the commutating electrode facing a deion grid.