SU796961A1 - Contact device for heavy-current apparatus - Google Patents

Description

one

The invention relates to electrical equipment, namely to contact nodes of high-current switching devices using elastic porous gaskets impregnated with liquid metal or liquid metal paste.

A contact device with porous elastic pads, impregnated with a liquid, metal or liquid metal paste is known. Elastic, gasket impregnated with liquid metal is placed in a recess on the electrode and secured by means of a ring un.,

It is also known to have a contact device of a high-current apparatus, containing stationary electrodes with fortified porous elastic pads soaked in liquid metal or liquid metal paste.

A disadvantage of the known devices is that when disconnected at the beginning of the initial stage, the liquid metal or liquid metal paste creates pepper clamps between the diverging current-carrying parts and passes the entire switched current through them, under the action of which a significant

part of the jumper volume. This leads to a relatively rapid depletion of the impregnating compositions of the batches, as a result of which their lifespan is reduced.

The purpose of the invention is to increase the service life when the device operates to shut off.

This goal is achieved / in

These gaskets are embedded springs on which graphite or carbon plates are installed that come in contact with the gasket and project in the off position beyond

working surface of the gasket.

FIG. 1 shows a schematic representation of the proposed device in the ejected position, front view; in fig. 2 - the same, in the connected state of the scientific research institute; in fig. 3 shows an intermediate position of the device corresponding to the initial stage of the shutdown process; in fig. 4 is a possible embodiment of the contact; in fig. five -

Another possible variant of the contact.

In this device, the stationary electrodes 1 are switched by the movable electrode 2 through elastic contact pads 3, impregnated with liquid metal or liquid metal paste, having graphite or carbon plates 4 attached to them in the terminal part. springs 5, which can be embedded in the gasket 3. The plates 4 are arranged in parallel in a row one after another and take care of the drawing plane. The plate is spring-loaded by the spring 5 individually. The multiplicity of the plates provides a multiplicity of points on the contact electrode and electrode 2, which, in turn, creates the proper conductability of the contact junction.

The elasticity of the gasket 3 makes it possible in the switched on state of the device for pressing the plate 4 into the gasket 3 (Fig. 2).

When the device is turned on, it is first in contact with the electrode 2 of the plate 4, and then the gasket 3. There is no significant erosion of the plates 4, electrode 2 and gasket 3.

A characteristic feature of the initial stage of the shutdown process (Fig. 3) is that the electrical separation of the electrode 2 from the gasket 3 does not occur immediately, but through the recycling 6 of liquid metal or liquid metal paste coming out of the gasket J and wetting electrode 2 layer. In the known device, before disconnecting these jumpers 6 (there may be several of them) are evaporated under the action of current, which leads to a large consumption of the composition impregnating the gasket 3. This reduces the life of the device. In the proposed device, the jumpers 6 do not burn out until the break caused by their stretching, since the current path through them is shunted by plates 4. The springs 5 of the plates 4 are adjusted so that their contact with electrode 2 is broken after the breaks of the jumpers 6. Between the surfaces of the plates 4 and the electrode 2 liquid metal bridges and bridges from the paste do not arise, since the material of the plates is chosen by an non-wetting liquid metal or impregnating paste. So, if as a impregnating material vyran is an alloy of gallium-indium-oLovo or a paste based on it, then the plates 4 of coal or graphite will be unnoticeable.

The advantage of coal and graphite is that these materials do not have a liquid phase, which guarantees the absence of welding between the plates 4 and electrode 2. The material of the gaskets 3 can be foam rubber, felt, woven materials.

Theoretically, the device can be made without springs 5, since their role is played by an elastic gasket material. However, many elastic materials, being impregnated with liquid metal, and even more so with paste, restore their shape after the cessation of the deforming forces is too inertial, and their elastic forces are not always sufficient. This leads to the need to use springs 5.

In one of the possible embodiments of the contact (Fig. 4), in order to create the best conditions for pressing the plates 4 into the gasket 3, the latter is thickened in the region of the location of the plates. In another possible embodiment of the proposed device (FIG. 5), the plates 4 are in contact with the gasket 3 with their sides. The springs 5 in this case are conveniently made of tape material.

For better conductivity between the plates 4 and the gasket 3, their surfaces in contact with the gasket 5 are metallized, for example, by introducing metal powder before they are baked.

This device can be used as contacts of your key.

The advantage of the device consists in the possibility of using it as both main and arcing contacts simultaneously with a large 5 working resource.

Claims (2)

1. USSR author's certificate 609138, cl. H 01 H 29/16, 1978. 2. USSR author's certificate 546953, cl. H 01 H 29/00, 1977.  about& shshschscht ff Ш1тщ ///////////// 1 Phi2.2 Phi2.5 t t / z.S