JPH0447927B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power switch that switches on and off current, and relates to improvements in the breaking performance of electromagnetic contactors, wiring switches, disconnectors, and the like.

A conventional electromagnetic contactor is shown in FIG. In the figure, 1 is a mounting base made of plastic, 2
is a fixed core laminated with silicon steel plates. 3 is a movable core made of laminated silicon steel plates like the fixed core 2. Reference numeral 4 denotes an operating coil that provides a driving force to attract the movable core 3 and the fixed core 2 against a tripping spring (not shown); 5 is a cross bar made of plastic and having a square window; Holds 3. 6 is a movable contact inserted into a corner window of the cross bar 5, 6A is a movable contact provided at one end of the movable contact 6, and 7 is a push spring that presses the movable contact 6. Reference numeral 8 is provided facing the movable contact 6, and a fixed contact 8A that can come into contact with and separate from the movable contact 6A is provided at one end. 8B
is a terminal portion provided at the other end of the fixed contact 8, and when both contacts 6A and 8A are in contact, current is passed from the fixed contact 8 to the movable contact 6. 9 is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, and 10 is a base on which the fixed contact 8 is attached. 11 is an arc cover that covers the electromagnetic contactor; 12 is an arc generated between the fixed contact 8A and the movable contact 6A; 13 is a magnetic metal arc extinguishing plate for extinguishing the arc 12; 8 are arranged parallel to each other in parallel to the joint surface with the fixed contact 8A. Note that since FIG. 1 is bilaterally symmetrical, only the right side cross section is shown.

In the electromagnetic contactor configured as above,
When the operating 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 is placed in the state shown in FIG.
Therefore, the fixed contact 8A and the movable contact 6A are separated from each other in the energized state, and an arc 12 is generated between the contacts 8A and 6A as shown in FIG. This arc 12 is attracted to a magnetic metal arc extinguishing plate 13, and the arc 12
After passing through the state A, it becomes an arc 12B, which is extinguished between the metal arc-extinguishing plates 13, and the current is briefly interrupted.

Conventional power switches operate as described above, so when extinguishing an arc, multiple metal arc extinguishing plates 1 are arranged in parallel.
Since only those between the movable contact 6 and the fixed contact 8 of No. 3 were involved, and not all of them could be used, there were drawbacks such as poor shearing performance and rapid contact wear.

This invention was made to eliminate the above-mentioned drawbacks, and a metal arc extinguishing plate is placed between the arc runner, which is parallel to the surface of the fixed contact and extended from the fixed contact. The first flat plate part is parallel to the surface of the fixed contact and is positioned between the back surface of the movable contact (the side to which the movable contact is not joined) and the fixed contact when the fixed contact and the movable contact are separated. A second flat plate part disposed in The flat plate part, the second flat plate part, and the fourth flat plate part form a U-shape on the side, and a cutout is formed by cutting out the part facing the movable contact from the second flat plate part to the fourth flat plate part. By comprising a commutating electrode having a cutout and configuring the movable contact to enter the cutout,
The purpose of the present invention is to provide a power switch with excellent insulation performance and low contact wear.

As an embodiment of this invention, a third
The case of an electromagnetic contactor having an arc runner as shown in the figure will be described. In the figure, 14 is an arc runner, which is electrically connected to the fixed contact 8 at the fixed contact side end 8B. Moreover, 14A is a notch portion facing the fixed contact 8A. FIG. 4 shows the commutation electrode 15, 15A is the first flat plate part,
15B is a second flat plate part, 15C is a third flat plate part,
15D is a fourth flat plate portion, and 15E is a notch portion facing the movable contact 6A. Third flat plate part 15
C, the side surfaces of the second flat plate portion 15B and the fourth flat plate portion 15D are U-shaped. Further, the movable contact 6 is configured to fit into the notch 15E. Although FIG. 4 shows the right half of the commutation electrode 15, the left half is constructed in the same manner.
As shown in FIG. 5, the first flat plate part 15A is arranged parallel to the surface of the fixed contact 8A, with the metal arc-extinguishing plate 13 sandwiched between it and the fixed contact 8. The second parallel portion 15B is parallel to the surface of the fixed contact 8A, and when the fixed contact 8A and the movable contact 6A are separated, the back surface of the movable contact 6 (the surface to which the movable contact is not joined)
and the arc runner. Further, the arc runner 14 is parallel to the surface of the fixed contact 8A, and is arranged between the fixed contact 8 and the metal arc extinguishing plate 13.

In the electromagnetic contactor configured as described above, both contacts 6A and 8A are connected in the energized state, similar to the conventional one.
When the contacts 6A and 8A are opened, an arc 12
However, this arc 12 is attracted to the magnetic metal arc extinguishing plate 13. arc runner 14
is provided closer to the movable contact 6A than the surface of the fixed contact 8, so the legs of the arc 12 of the fixed contact 8A are easily transferred to the arc runner 14. On the other hand, when a magnetic material is used as the commutating electrode 15, a strong magnetic field indicated by B is generated by the current flowing through the movable contactor 6, as shown in FIG. 4, and a force indicated by F acts on the arc 12. Therefore, the arc 12 on the movable contact 6A
The foot is easily transferred to the commutating electrode 15, and the arc 12
becomes an arc 12A shown in FIG. Further, when the arc 12A is reached, a current as shown by the arrow flows through the arc runner 14, so that the arc runner 14 is driven toward the metal arc extinguishing plate 13. At the same time, on the commutation electrode 15 side, the arc 1
2A passes through arc 12B and arc 12C, and finally reaches the state of arc 12D, and the first flat plate portion 1
The arc is extinguished between the 5A and the arc runner 14, and the current is immediately cut off.

As described above, in the present invention, the leg of the arc 12 on the movable contact 6A is quickly transferred to the commutation electrode 15, so that wear and tear on the movable contact 6A is reduced. Further, as shown in the arc 12D, since the arc is extinguished between the first flat plate portion 15A and the arc runner 14, all of the metal arc extinguishing plates 13 are involved in arc extinguishing, resulting in excellent shear cutting performance. is obtained. moreover,
Since the arc is extinguished on the flat surface of the metal arc extinguishing plate 13, electric field concentration is less likely to occur at the legs of the arc.
It has good heat conduction and exhibits extremely excellent shingle cutting performance.

Furthermore, the provision of the arc runner 14 has the effect of reducing wear and tear on the fixed contact 8A.

In addition, in the above-mentioned embodiment, the fixed contact 8
A case has been described in which the arc runner 14, which is formed by extending from the fixed contact 8, is manufactured as a separate member from the fixed contact 8. However, as shown in FIG. 6, the fixed contact 8 is formed in a U-shape, and the fixed contact 8A The arc runner 14 may be integrally manufactured using a portion extending from the support portion of the arc runner 14.

In this case, the legs of the arc 12 are caused by the magnetic field created by the current flowing through the fixed contact 8 (indicated by the arrow).
Since it is transferred from the fixed contact 8A to the arc runner 14, the consumption of the fixed contact 8A can be reduced, the arc time is shortened, and the shearing performance is significantly improved.

Further, as another embodiment, as shown in FIG. 7, the present invention can be applied to a power switch such as a wiring liner or a disconnector. In the figure, 16 is a rotating shaft, 17 is a stranded wire, and the stranded wire 17 connects the commutating electrode 15 and the movable contact 6.
are electrically connected.

Note that when manufacturing a high-voltage power switch, it is necessary to increase the number of metal arc-extinguishing plates 13;
As in the above embodiment, excellent shingle cutting performance can be obtained by arranging the metal arc-extinguishing plate 13 parallel to the surface of the fixed contact 8A, without increasing the base area of the power switch. A high voltage power switch can be realized.

As described above, the arc runner is formed by extending from the fixed contact supporting the fixed contact, and the first flat plate part is parallel to the surface of the fixed contact and faces the metal arc extinguishing plate. a second flat plate part parallel to the surface and arranged so as to be located between the back surface of the movable contact (the surface on the side to which the movable contact is not joined) and the fixed contact when the movable contact and the fixed contact are opened; , a third flat plate part that connects the first and second flat plate parts, and a fourth flat plate part extending from the second flat plate part in the direction of separation of the movable contact, the third flat plate part;
The second flat plate part, the fourth flat plate part has a U-shaped side surface, and has a cutout part extending from the second flat plate part to the fourth flat plate part and cutting out the part facing the movable contact. By providing a commutating electrode and configuring the movable contact so that it enters the notch, it is effective to improve shearing performance and reduce contact wear.

[Brief explanation of drawings]

Figure 1 is a right sectional view of a conventional power switch;
The figure is an enlarged side view of the main part of Figure 1, Figure 3 is a perspective view showing an arc runner used in a power switch according to an embodiment of the present invention, and Figure 4 is a commutation diagram of an embodiment of the present invention. FIG. 5 is an explanatory diagram showing the operation of one embodiment of the invention; FIG. 6 is a side view of another embodiment of the invention; and FIG. 7 is a further embodiment of the invention. It is a side view which shows an example. In the figure, 6 is a movable contact, 6A is a movable contact, 8 is a fixed contact, 8A is a fixed contact, 13 is a metal arc extinguishing plate, 14 is an arc runner, 15 is a commutation electrode, 15A is a first flat plate part, 15B is a second flat plate part, 15C is a third flat plate part, 15D is a fourth flat plate part, and 15E is a notch part. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A fixed contact, a fixed contact joined to this fixed contact, a movable contact, a movable contact joined to this movable contact and capable of coming into contact with and separating from the fixed contact, and a movable contact formed by extending from the fixed contact. arc runner,
a metal arc-extinguishing plate made of a magnetic material and disposed parallel to and facing the arc runner, a first flat plate portion parallel to the surface of the fixed contact and facing the metal arc-extinguishing plate, and the fixed contact a second flat plate part parallel to the surface of the movable contact and located between the fixed contact and the surface of the movable contact to which the movable contact is not joined when the movable contact and the fixed contact are separated; The third flat plate part has a third flat plate part that connects the first and second flat plate parts, and a fourth flat plate part that extends from the second flat plate part in the opening direction of the movable contact, The second flat plate part and the fourth flat plate part form a U-shape on the side, and the fourth flat plate part is formed from the second flat plate part.
A power source comprising: a commutating electrode having a cutout portion across the flat plate portion of the electrode, the portion facing the movable contact being cut out, and the movable contact being configured to enter the cutout portion. switch.