JPS598931B2 - 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 as a current switching element of an on-load tap changer, for example.

When using a vacuum switch as an on-load tap changer, it is desirable that the opening/closing operation be performed in such a way that once the movable electrode is started, the movement can be completed regardless of the movement of the drive source.

Opening/closing mechanisms to enable such operations have already been proposed in, for example, Japanese Patent Publication No. 53-35255, and include energy storage springs, energy storage spring restraining latches, latch return springs, etc. It is necessary to install one for opening and one for closing, and in order to maintain the open state after the vacuum switch is opened, the operating shaft (=input shaft) of the opening/closing mechanism must be connected to the vacuum self-closing force of the vacuum switch. There were many disadvantages in terms of economy and reliability, such as the need to restrain and hold the device in a fixed position against the closing reaction force caused by the polarization.

The present invention has been developed in view of the above-mentioned circumstances, and is configured so that the movable electrode of the vacuum switch is driven through a reversing spring, and the instantaneous force caused by the reversing action of the reversing spring causes the vacuum switch to open and close at once. At the same time, the present invention provides a simple and highly reliable vacuum switch opening/closing mechanism in which the open/closed state of the vacuum switch is self-maintained without being particularly restricted by an operating system after opening/closing.

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 14 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 13 so as to be slidable in the axial direction.

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

The opening/closing block 9 is connected to the frame 13 by a dish-shaped opening/closing spring 1.
0 and is self-held in place by a disc-shaped opening/closing spring 10.

Also, a disc-shaped spring 11 is used to assist in self-retention of the opening/closing rod 6.
is interposed between the frame 13 and the opening/closing rod 6.

The bifurcated operating lever 12 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. 8, and the contact 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 operating lever 12 is completely loosely fitted to 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, applies the force to the movable electrode 5 through the collar 7, and applies contact pressure with the fixed electrode 2, thereby self-retaining these mechanisms.

Further, the disc-shaped spring 11 has enough rigidity to self-hold the opening/closing rod 6 without accumulating strain energy in the direction of closing.

When opening the pole from the closed state shown in FIG. 1, as the bifurcated operating lever 12 is driven downward, vacuum is applied until the gap between the upper lever of the bifurcated operating lever 12 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.

Furthermore, when the bifurcated operating lever 12 pushes down the lever of the opening/closing block 9, the movable electrode 5 remains closed due to the vacuum self-closing force and the self-holding assisting force of the plate spring 11, as shown in FIG. , the opening/closing block 9 is a dish-shaped opening/closing spring 10.
is distorted in a direction that inverts it downward.

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, comes into contact with the collar 8 and opens the opening/closing rod 6, which is directly connected to the movable electrode 5, by pressing down the opening stroke dimension at once.

At this time, the dish-shaped spring 11, which has enough rigidity to maintain the closed state by itself, cannot resist the downward instantaneous force of the dish-shaped opening/closing spring 10, and is restrained by the movement of the opening/closing rod 6. It is reversed in the same direction as the dish-shaped opening/closing spring 10.

On the other hand, after the disc-shaped opening/closing spring 10 is reversed, the bifurcated operating lever 12 is not subjected to any driving load due to the forward running of the opening/closing block 9 (it stops at a completely loosely fitted position as shown in FIG. 3).

In other words, the opening operation is completed.

(Opening/Closing Operation) In the open state shown in FIG. 3, the bifurcated operating lever 12 is completely loosely fitted to 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. .

Further, the disk-shaped spring 11 for assisting self-holding has enough rigidity to self-hold the opening/closing rod 6 without accumulating strain energy in the direction of opening.

When closing the pole from the open state shown in FIG. 3, as the bifurcated operating lever 12 is driven upward, the gap between the lower lever of the bifurcated operating lever 12 and the lever of the opening/closing block 9 disappears. Until this happens, the vacuum switch opening/closing mechanism remains self-maintained in the open state without any change.

Further, the bifurcated operating lever 12 pushes up the lever of the opening/closing block 9. As shown in FIG. 10 is distorted in a direction that inverts it upward.

In other words, accumulate energy. Immediately after passing the reversal point, the disc-shaped opening/closing spring 10 instantaneously pushes the opening/closing block 9 upward by its reversing action.

The opening/closing block 9, which rises due to the instantaneous spring force, comes into contact with the collar 7, and the opening/closing rod 6, which is directly connected to the movable electrode 5, immediately pushes up the opening stroke dimension and closes.

At this time, the dish-shaped spring 11, which has enough rigidity to self-maintain the open state, cannot resist the upward instantaneous force of the dish-shaped opening/closing spring 10, and is no longer restrained by the movement of the opening/closing rod 6. It is reversed in the same direction as the dish-shaped opening/closing spring 10.

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

In other words, the closing operation is completed. In addition, the above figures 1 to 4
In the embodiment shown in the figure, a dish-shaped spring is used as a mechanism for generating an instantaneous force due to the reversal action that causes the opening and closing of the poles. However, even if a plate spring is used instead of this dish-shaped spring, the same effect as in the above embodiment is achieved. A similar effect can be obtained by using a compression coil spring 10 as shown in FIG.

On the other hand, in the embodiments shown in FIGS. 1 to 4 above, a case has been described in which a reversible rattling action by the reversal action of a dish-shaped spring is used as the self-holding assistance mechanism, but a plate spring may also be used instead of this dish-shaped spring. The same effect as in the embodiment can be obtained, and the same effect can also be obtained by using a compression coil spring 11 as shown in FIG.

Further, as shown in FIG. 6, a similar effect can be obtained by using a mechanism in which the compression coil spring 11 presses the spherical latch to engage the groove of the opening/closing rod 6 and latches the opening/closing rod 6.

In the above explanation, an example of application as a current switching element of an on-load tap changer has been described, but it goes without saying that the present invention is not limited to this. By applying an instantaneous force due to the reversing action of a spring on the opening/closing rod directly connected to the movable electrode, the vacuum switch opens and closes all at once, and after operation, the open/closed state of the vacuum switch is self-maintained without restraining the operating system. , has the effect of applying contact pressure to the movable electrode by the spring force of the spring when the pole is closed.

In addition, the opening/closing mechanism of the present invention eliminates the intervention of a mechanical intervention, whereas conventional energy accumulating mechanisms operate a mechanical intervention such as a latch as a means of accumulating and releasing energy. This has the effect of allowing energy to be stored and released only at the timing of driving the operating system without requiring it.

Therefore, it has a simple structure, is easy to assemble, and is very economical.

[Brief explanation of drawings]

1 to 4 show a switching switch for an on-load tap changer according to an embodiment of the present invention, in which FIG. 1 shows a closed state, FIG. 2 shows a state in the middle of an opening operation, and FIG. 3 shows 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 invention, and FIG. 6 is a diagram showing another embodiment of the 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 and 8 are collars, 9 is an opening/closing block, 10 and 11 are springs, and 12 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; a holding spring that holds the opening/closing rod in the open position against the vacuum self-closing force of the vacuum switch; An opening/closing mechanism for a vacuum switch comprising a reversing spring that is displaced in accordance with the movement of an opening/closing block and has a reversing load on the opening/closing block that is greater than the vacuum self-closing force of the vacuum switch and the holding force of the holding spring.