SU788210A1 - Switching apparatus contact unit - Google Patents

Description

(54) CONTACT KNOT OF THE SWITCHING MACHINE

I

The invention relates to electrical equipment, specifically to the contact nodes of switching devices, using as intermediate contacts porous elastic pads, impregnated with liquid metal or liquid metal paste.

A contact assembly is known with elastic gaskets impregnated with liquid metal or liquid metal paste, which are located on stationary electrodes and are switched by a moving electrode moving when closed in a direction perpendicular to the surface of the gaskets 1.

The disadvantage of it is that the actuator pressing forces must be limited to certain limits. At low pressures, not the entire surface of the moving electrode is in contact with the surface of the gasket, which may not ensure proper conductivity of the contact junction. For large taps, there is a danger of leaving the gasket impregnating for its composition, which limits the life of the device or makes it impossible to work with any orientation relative to

Strength of the tin. The gaskets are also not protected against oxidation.

Also known contact node switching apparatus containing two stationary electrodes equipped with porous elastic pads, impregnated with liquid metal or liquid metal paste, and a movable electrode, located between the additional porous pads, made similar to the pads of stationary electrodes. In this contact unit, the stationary electrodes are located in the same plane, and the movable electrode 2 moves in the same plane.

The disadvantage of this contact unit is the large deformations experienced by porous gaskets during switching, which leads to the release of the impregnating gasket composition and the aging of the gaskets themselves.

In addition, the moving contact, having a large mass, and therefore a large inertia, makes switching performance difficult.

Claims (2)

The purpose of the invention is to increase the durability of the contact node. This goal is achieved by the fact that in a contact unit containing two stationary electrodes equipped with porous elastic pads impregnated with liquid metal or liquid metal paste and a movable electrode located between additional porous pads made similarly to the pads of stationary electrodes, the stationary electrodes are installed in different planes so that between their porous gaskets formed a contact gap equal to the size of the gap between the additional gaskets, and mobile This electrode is made in the form of a plate rotating in the plane of the contact gaps, one end of which is made of conductive and the other of electrically insulating material. FIG. 1 schematically shows the device, the included position; in fig. 2 - the same, the intermediate moment between shutdown and inclusion. In the on position, the current from the stationary electrode 1 enters the gasket 2, made of porous elastic material impregnated with liquid metal or liquid metal paste, and from it passes to the conductive end 3 of the plate 4, filling the gap between the same gaskets 2 and 5, then a gasket 5 located on another stationary electrode 6. The other end 7 of the plate 4 is made of electrically insulating material and is located in the on position of the device between the additional gaskets 8 and 9, also filling their gap. The switching device is made by rotating the plate 4 through 180 °. In this case, in the off state, the end 7 of the plate 4 is located between the gaskets 2 and 5, filling it and thereby creating an open circuit. The end 3 of the same plate in the off position fills the gap between the gaskets 8 and 9. The plate can be rotated by various actuators, and therefore is conventionally received manually and is represented by a shaft 10 and a handle 11. In FIG. 2 shows the intermediate position of the plate 4, existing at the commutation, i.e., such that the plate 4 is rotated 90 ° from the initial position. The edges of the working tips of the plate 4 have inclined edges rounded in the region of their approach. This shape of the edges of the parts of the plate 4 eliminates the tearing and breaking of the gaskets 2, 5, 8 and 9, and also allows the plate 4 to rotate in any direction during switching. In addition, a portion of the edges of the insulating tip 7 of the plate 4 located near the rounding does not come into contact with the surface of the gaskets 2, 5, 8 and 9, and therefore it does not form a liquid metal pitch or paste, which is important for reliable disconnection. When switching, the gasket theoretically experiences compression and relaxation due to the entry and exit from the inter-gaps of the plate 4. However, taking into account that the restoration of the gasket after the cessation of the forces deforming it is relatively inertial, and the switching time is extremely short, it can be argued that when switching, the gasket deformation is practically absent in the proposed device. The latter contributes to the better preservation of the impregnating composition in the gaskets, and consequently, a longer service life. Since the current 4 in the switched on position of the device flows perpendicular to the working surface of the conductive end 3 of the plate 4, the thickness of this end 3 of the plate 4 can be made quite small, whereas in a known device the movable electrode conducts current in the longitudinal direction, and consequently, it must have a sufficiently large cross section that can pass the switched current, which does not allow a significant decrease in its mass. Since the working surfaces of the gaskets and the plate 4 are in contact with the environment only during the switching process, all the contacting surfaces are well enough protected from oxidation. The advantage of the proposed device lies in the increased life of the gaskets and the ease of the moving part. The device can be used in disconnectors and as the main contacts of the switch. The invention The contact node of the switching apparatus, comprising two stationary electrodes, equipped with porous elastic pads, impregnated with liquid metal or liquid metal paste, and a movable electrode, located between additional porous pads, made similar to the stationary electrode pads, characterized in that, in order to increase durability, stationary electrodes are installed in different planes so that between their porous gaskets there is a contact gap equal to largest gap between the additional spacers and the movable electrode is in the form povorachivayuscheys in the plane of the contact plate gap, one end of which is made of a conductive current lead, and another - of electrically insulating material. Sources of information taken into account during the examination 1. USSR author's certificate No. 546953, cl. H 01 H 29/00, 1975. 2. USSR author's certificate for application number 2465360/07, 1977. . .l . fO 2 1 // (rig 2