JPS598932B2 - Vacuum switch opening/closing mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the opening/closing mechanism of a vacuum switch used, for example, as a current switching element of an on-load tap changer.

When using a vacuum switch as an on-load tap changer, the opening/closing operation is such that when the vacuum switch opens, it opens instantaneously at high speed in order to efficiently cut off the current, and when it closes, it opens and closes the vacuum switch. Since it is necessary to insert the switch movable electrode with a low impact, it is desirable to close the switch at a lower speed than when it opens.

In any case, it is necessary to maintain these states stably after the operations are completed.

The present invention has been made in view of the above-mentioned circumstances, and is configured so that the movable electrode of the vacuum switch is driven via a reversing spring, and the contact is opened rapidly by the instantaneous force caused by the reversing action of the reversing spring. It is a simple and reliable device that closes the pole at a slow and quiet speed, and even if the operating system is not particularly restrained after the opening/closing operation, the open/close state is maintained by itself. This provides a high vacuum switch opening/closing mechanism.

The present invention will be described in detail below with reference to FIGS. 1 to 4.

As shown in the figure, the vacuum switch 1 includes a fixed electrode 2, an exterior 3,
It is composed of a bellows 4 and a movable electrode 5, and the fixed electrode 2 is fixed to a frame 13 and supports the vacuum switch 1.

One end of the opening/closing rod 6 is connected to the movable electrode 5, and the other end is supported by a frame 12 so as to be freely slidable in the axial direction.

Further, the opening/closing rod 6 has ribs 7 and 8, and an opening/closing block 9 is interposed between the ribs, which can be slidably moved between the ribs 7 and 8 using the opening/closing rod 6 as a guide. .

The opening/closing block 9 is connected to the frame 12 by a dish-shaped opening/closing spring 1.
0 and is self-held in place by a disc-shaped opening/closing spring 10.

The bifurcated operation lever 11 is loosely engaged with a lever of the opening/closing block 9.

Next, the operation of the mechanism having the above structure will be explained.

The opening operation is performed in the order of FIG. 1 → FIG. 2 → FIG. 3 → and the closing operation is performed in the order of FIG. 3 → FIG. 4 → FIG. 1.

(Closing → Opening Operation) In the closed state shown in FIG. 1, the bifurcated operation lever 11 is completely loosely fitted with the lever of the opening/closing blotter 9 and is stopped.

The opening/closing block 9 receives the spring force from a disc-shaped opening/closing spring 10, and applies that force to the movable electrode 5 through the collar 7 to apply contact pressure to the fixed electrode 2, thereby making these mechanisms self-retaining.

When opening the pole from the closed state shown in FIG. 1, by driving the bifurcated operating lever 11 downward, vacuum is applied until the gap between the upper lever of the bifurcated operating lever 11 and the lever of the opening/closing block 9 disappears. The switch opening/closing mechanism remains self-maintained in the closed state without any change.

When the bifurcated operation lever 11 further pushes down the lever of the opening/closing block 9, the movable electrode 5 remains closed due to the self-holding force of the vacuum self-closing force, and the opening/closing block 9 is moved downward as shown in FIG. The opening/closing spring 10 is strained in a downward direction.

In other words, accumulate energy.

Then, as soon as the reversal point is exceeded, the dish-shaped opening/closing spring 10
The opening/closing block 9 is momentarily pushed downward by the reversing action.

The opening/closing block 9, which descends due to the instantaneous spring force, contacts the collar 8 and immediately pushes down the opening stroke dimension of the opening/closing rod 6 directly connected to the movable electrode 5 to open the opening.

On the other hand, after the disc-shaped opening/closing spring 10 is reversed, the bifurcated operating lever 11 is not subjected to any driving load due to the advance running of the opening/closing block 9, and stops at the completely loosely fitted position as shown in FIG.

That is, the opening operation is completed.

(Opening→Closing operation) In the open state shown in FIG. 3, the bifurcated operation lever 11 is completely loosely fitted with the lever of the opening/closing block 9 and is stopped.

The opening/closing block 9 receives the spring force from a disc-shaped opening/closing spring 10, and the movable electrode 5 is self-maintained in a fully opened state against the vacuum self-closing force of the vacuum switch 1 by transmitting the force through the collar 8. .

When closing the pole from the open state shown in FIG. 3, if the bifurcated operating lever 11 is driven upward, the clearance between the lower lever of the bifurcated operating lever 11 and the lever of the opening/closing block 9 disappears. Until then, the vacuum switch opening/closing mechanism remains self-maintained in the open state without any change.

Further, when the bifurcated operating lever 11 pushes up the lever of the opening/closing block 9, the opening/closing rod 6 directly connected to the movable electrode 5 moves to the opening/closing block 9 due to the vacuum self-closing force of the vacuum switch, as shown in FIG. Following the upward movement of the opening/closing block 9, the opening/closing block 9 distorts the disc-shaped opening/closing spring 10 in a direction that reverses it upward.

The movable electrode 5 then quietly closes.

After the movable electrode 5 is closed, as the opening/closing block 9 moves upward, the dish-shaped opening/closing spring 10 immediately takes a reversing action when it exceeds a reversing point.

The spring force resulting from the reversal is transmitted to the collar 7 by the opening/closing block 9, applying contact pressure to the movable electrode 5 via the opening/closing rod 6, and stably self-holding.

On the other hand, the bifurcated operating lever 12 is stopped at a completely loosely fitted position as shown in FIG. 1 without receiving any driving load due to the forward running of the opening/closing blotter 9 after the disc-shaped opening/closing spring 10 is reversed.

In other words, the closing operation is completed.

In addition, in the embodiments shown in FIGS. 1 to 4 above, a case has been described in which a dish-shaped spring is used as a mechanism for generating an instantaneous force due to a reversal action that opens the poles, but a plate spring may be used instead of this dish-shaped spring. The same effect as in the above embodiment can be obtained even if a compression coil spring is used as shown in FIG.

Note that the collar 7 may be removed in response to a requirement that the contact pressure at the time of closing the pole is only a vacuum self-closing force.

In the above description, an example of application of the on-load tap changer as a current switching element has been described, but it goes without saying that the present invention is not particularly limited to the on-load tap changer.

As described in detail above, according to the present invention, the vacuum switch performs an opening operation at once by applying an instantaneous force due to the reversal action of a spring on the opening/closing iron directly connected to the movable electrode of the vacuum switch, and slowly when closing. The pole closes slowly due to fast action.

In addition, after operation, it is possible to maintain the open and closed state of the vacuum switch by itself without particularly restraining the operation system, and in that case, contact pressure is also applied to the movable electrode by the spring force when the switch is closed. With these effects, it can be said that the vacuum switch opening/closing mechanism is simple in structure and very economical.

[Brief explanation of drawings]

Figures 1 to 4 show a switching switch for an on-load tap changer according to an embodiment of the present invention, in which Figure 1 is in a closed state, Figure 2 is in a state in the middle of opening operation, and Figure 3 is in an open state. Polar state: FIG. 4 is a diagram showing a state in the middle of a polar closing operation. FIG. 5 is a diagram showing another embodiment of the present invention. Note that the same reference numerals in the figures indicate the same or corresponding parts. In the figure, 1 is a vacuum switch, 6 is an opening/closing rod, 7 is a collar, 8 is a collar, 9 is an opening/closing block, 10 is a dish-shaped opening/closing spring, and 11 is an operating lever.

Claims (1)

[Claims] 1. An opening/closing rod connected to a movable electrode of a vacuum switch;
An opening/closing block that is movable in the axial direction of the opening/closing rod and engages with the opening/closing rod with a predetermined play; the opening/closing block is displaced in accordance with the movement of the opening/closing block, and the vacuum self-closing force is greater than the vacuum self-closing force of the vacuum switch with respect to the opening/closing block. A vacuum switch opening/closing mechanism equipped with a spring that has a reversal load.