RU2716698C2 - Contact clamping device - Google Patents

Abstract

FIELD: physics.SUBSTANCE: invention relates to high-voltage instrumentation and can be used in disconnecting switches, switches, load switches, earthing switches.EFFECT: technical result is simplification of contact clamping device design, coupled contact blades, which are performed by single-turn annular cut springs, where pressing forces of springs act directly in places of contact of paired knives with fixed contacts.1 cl, 4 dwg

Description

The invention relates to the field of high-voltage apparatus engineering and can be used in disconnectors, switches, load breakers, and earthing switches. Known contact devices containing two paired knives, pivotally rotated on the axis and fastened together at a given distance using clamping elements.

Closest to the claimed invention is a contact clamping device according to the patent of the Russian Federation No. 2158981, containing two paired knives pivotally pivotally mounted on an axis and fastened together at a predetermined distance in the disconnected position and using clamping bursting elements.

The disadvantage of this device is the design complexity, since the bursting function of contact knives and contact pressing functions are performed by a large number of plate parts and multi-turn springs, pressing the knives at some distances from the contacting contact surfaces.

The objective of the present invention is to provide a contact clamping device free from these disadvantages. This task is achieved by the fact that in the known contact clamping device containing two paired knives, clamping elements with springs and elements of the expansion of the paired knives at a predetermined distance in the off position, these pressing elements of the knives are made of single-coil springs with a shear, and their expansion at a predetermined distance in the disconnected position - a rod with shoulders.

In FIG. 1 shows the contact pressing device in the assembled on position, FIG. 2 as in FIG. 1, a top view, in FIG. 3 as in FIG. 2 in the off position, in FIG. 4 cut ring single-coil spring.

The contact clamping device consists of two paired knives 1 and 2 in contact with fixed contacts 3, contact pressing is carried out by single-coil springs with slices that have a cut width slightly less than the width of the paired knives, which transmit the pressing force to the knives with cut edges 5, using beads 7 , the distance is fixed in the rod 6. And between the knives in the off position.

In the on position, the forces of the single-coil springs 4 are transmitted through their edges 5 to the paired knives 1 and 2, providing contact pressing between the knives and the fixed contacts 3 in the places of their direct contact. In this case, between the shoulders 7 of the rod 6 and the inner surfaces of the knives 1 and 2, a gap H is formed, guaranteeing contact pressing (contact failure).

After disconnecting, single-coil springs 4 with their edges 5 bring the paired knives 1 and 2 together, choosing the gaps H, after which the shoulders 7 and the rods 6 abut against the inner surfaces of the knives 1 and 2, providing the necessary distance A between the knives in the disconnected position, where A is the specified distance between paired knives in the off position.

The manufacture of single-coil springs with slices dramatically increases the technology of their manufacture in the mass production of products. So, for example, on a spring-coiling machine, a spring of 30 ... 40 turns is made. It is clamped in a vice and with two cutting discs for metal in one pass, the mill gets 30 ... 40 ready-made springs.

The proposed device has several advantages for the production of equipment compared to the prototype:

- there is no need to design, produce, and maintain a die cut for the manufacture of 12 plates per product, which are replaced by three rods with shoulders manufactured on automatic lathes.

- single-piece production of 6 multi-coil compression springs is replaced by group production of single-coil springs with a slice many times reducing the complexity.

- clamping the contact points of the paired contact knives with the fixed contacts ensures the stability of the contact pressure.

- the use of single-coil springs with an insulating varnish-and-paint coating with the simultaneous use of a rod with beads increases by an average of 8-10 mm the interpolar insulation distance by maintaining the phase dimension at the level of the dimensions of paired knives in their outer dimensions.

EFFECT: time-consuming manufacturing process and ensuring stable dimensions and reliability of contact pressure are significantly reduced.

Literature:

1. RF patent №2158981 "Contact clamping device" from 05/07/99

Claims (1)

A contact clamping device, for example, for load breakers, comprising two paired knives with holes in contact with two fixed contacts, clamping springs and an element for extending the paired knives to a predetermined distance in the disconnected position, characterized in that the clamping springs are made of single-coil annular cut, which transmit the pressing force on the knives with cut edges, the width of which is slightly less than the outer width of the paired knives, and the element of bursting of the paired knives for a given size oyanie in the open position is formed by a rod with ribs, which in open position rest on the inner surface of the blades, wherein the springs have an insulating paint.

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