JPS5936376B2 - Vacuum cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum valve having a vertical magnetic field electrode structure, and more particularly to a vacuum valve having an improved reinforcing plate for preventing deformation of a coil electrode due to impact when opening and closing the electrode.

Many vacuum valves having a vertical magnetic field electrode structure have been proposed by the applicant.

FIG. 1 shows an example of its structure.

1 is the main electrode, and an arc is generated on this surface when the current is cut off.

Reference numeral 2 denotes a coil electrode, which consists of an arm portion extending radially from the current-carrying shaft 3, a portion extending in the circumferential direction at the outer periphery, and a portion 2a connected to the main electrode 1. An axial magnetic field, ie, a longitudinal magnetic field, is generated with respect to the column.

4 is a reinforcing plate, which is made of a material with higher resistance and mechanical strength than the coil electrode 2, such as stainless steel, and the coil electrode 2 is deformed by the impact when the electrode is opened and closed, and the main electrode 1 and the part This prevents anything other than Part 23 from coming into contact with it.

It is preferable that both the main electrode 1 side and coil electrode 2 side surfaces of the reinforcing plate 4 are bonded together by a method such as brazing.
Main electrode 1 and coil electrode 2 are connected at connection part 23 from the viewpoint of current conduction.
Since the top priority is to bond the two, the conventional method is to bond the reinforcing plate 4 only to either the main electrode 1 side or the coil electrode 2 side, leaving a slight gap on one side and not bonding. It was a method.

According to this, the adhesion between the main electrode 1 and the coil electrode 2 at the connecting portion 28 is reliably performed, and the reinforcing plate 4 and the main electrode 1 or the coil electrode Deformation of the coil electrode 2 by only one of the gaps 2 is sufficient for reinforcement against compressive force.

However, when high voltage and large current interruption are required and the opening/closing speed of the electrodes increases, the following problems arise with the conventional reinforcing plate structure.

As mentioned above, the reinforcing plate 4 is sufficiently effective when the electrode is inserted, but the problem arises when the electrode is opened.

In the conventional reinforcing plate structure, the coil electrode 1 side or the coil electrode 2 side
Since only one of the sides is bonded, there is no reinforcing effect against the force (tensile force) that pulls the main electrode 1 and the coil electrode 2 together in the axial direction.

When the electrode is opened, a tensile force is applied to the electrode portion due to inertial force.

When the opening speed is slow, this tensile force is not much of a problem, but when the opening speed is fast, for example, about 2 m/sec or more, the reinforcing plate 4 is not effective against this tensile force. , the peripheral portion of the coil electrode 2 is deformed into a curved shape.

This deformation is reversed in the next electrode insertion operation and the warp returns to its original state, but if such a deformation operation is repeated many times, the connecting portion 2a between the main electrode 1 and the coil electrode 2 may suffer fatigue failure.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and is an air collector that prevents deformation of the coil electrode when opening and closing the electrode in a device equipped with a coil electrode for generating a vertical magnetic field. Aim to get a valve.

The present invention will be explained below with reference to FIGS. 2 and 3.

FIG. 2 is an example of a vertical magnetic field electrode structure employing the present invention.

This structure differs from the conventional structure shown in Fig. 1 in that the reinforcing plate 4 has different diameters on the main electrode 1 side and the coil electrode 2 side, and the reinforcing plate 4 has a larger diameter on the coil electrode 2 side. It is placed.

A through hole 5 is provided in the center of the coil electrode 2, and the through hole 5 is set to have a diameter that allows only the small diameter portion of the reinforcing plate 4 to be inserted therein.

That is, the reinforcing plate 4 has its small diameter portion C1 adhered to the main electrode 1 through the central through hole 5 of the coil electrode 2, and its thick diameter portion C2 is separated from the stepped portion of the coil electrode 2 by a slight gap. and is opposed to the current-carrying shaft 3 with a gap therebetween.

Such a configuration has the following advantages.

First, the connection at the connection part 2a between the main electrode 1 and the coil electrode 2 is as follows.
Similar to the conventional case, the reinforcement effect against the gap between the thick diameter portion C2 of the reinforcing plate 4 and the stepped portion of the coil electrode 2, the gap between the thick diameter portion C2 and the current-carrying shaft 3, and the compressive force when the electrode is inserted can be expected.

That is, the compressive force can be received by the large diameter portion C2 of the reinforcing plate 4 coming into contact with the current-carrying shaft 3.

Furthermore, since the thick diameter portion C2 of the reinforcing plate 4 comes into contact with the stepped portion of the coil electrode 2 against the tensile force when the electrode is opened, it is possible to suppress the coil electrode 2 from being deformed so as to warp up.

FIG. 3 shows another embodiment of the invention.

The difference from the example shown in FIG. 2 is that the reinforcing plate 4 is divided into two parts 4a and 4b.

The divided reinforcing plates 4a and 4b are bonded together by brazing or the like when assembling the electrode part, and have the same effect as the example shown in FIG. 2, but by dividing the reinforcing plate 4 into two, the main electrode part There is an advantage that the diameter of the portion 4a to be bonded to the coil electrode 2 can be selected regardless of the diameter of the through hole 5 of the coil electrode 2.

This is because when the impact force when inserting the electrode is large, the reinforcement plate 4
The adhesive surface between the main electrode 1 and the coil electrode 2 is connected to the center through hole 5 of the coil electrode 2.
This is effective when you want to make the diameter larger than the diameter of the

As described above, according to the present invention, the through hole is provided in the coil electrode, the reinforcing plate is composed of a small diameter part and a large diameter part, and the large diameter part of the reinforcing plate is supported by the stepped part of the coil electrode, By bonding the end face on the side of the small diameter portion to the main electrode, deformation of the coil electrode when the electrode is opened and closed can be prevented, and a vertical magnetic field generating valve with a long mechanical life can be provided.

Furthermore, by dividing the reinforcing plate into two parts, it is possible to freely set the area of the adhesive portion between the main electrode and the reinforcing plate.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional vertical magnetic field electrode, where a is a plan view or a side view taken along line A-A in Fig. 1a, Fig. 2 is a sectional view showing an embodiment of the present invention, and Fig. FIG. 3 is a sectional view showing another embodiment of the present invention. 1... Main electrode, 2... Coil electrode, 4
...Reinforcement plate, 4a, 4b...Divided reinforcement plate, C1...Small diameter portion, C2...
...Large diameter part, 5...Central through hole of coil electrode,
2a... Adhesive part between main electrode and coil electrode, b...
・・・Stepped part of coil electrode.

Claims (1)

[Scope of Claims] 1. A pair of main electrodes that can be relatively moved toward and away from each other are arranged facing each other in a vacuum container, and a pair of main electrodes that are arranged on the back side of the main electrodes and connected to the main electrodes are provided between the main electrodes. The coil electrode is equipped with a coil electrode that generates a magnetic field parallel to the generated arc, and this coil electrode is fixed to the conductive shaft, and the reinforcing section is provided with a portion having a different diameter between the end of the conductive shaft and the facing surface of the main electrode. A plate is arranged, and a through hole having a stepped part is provided in the center of the coil electrode, into which the reinforcing plate is inserted, and the small diameter part of the reinforcing plate is fixed to the main electrode, and the large diameter part is fixed to the main electrode. A vacuum breaker arranged so as to be movably engaged with the stepped portion of a hole. 2. The vacuum breaker according to claim 1, wherein the small-diameter portion of the reinforcing plate is fixed to the main electrode via another member having a larger diameter than the small-diameter portion.