SU1292062A1 - Three-pole vacuum circuit breaker - Google Patents

Abstract

The invention relates to the field of electrical engineering, specifically to vacuum circuit breakers. The purpose of the invention is to increase reliability. A three-lane vacuum circuit breaker contains an insulating casing consisting of two parts 1 and 2 connected by a gasket 3. The fixed contacts 4, the movable contacts 5 are placed on the contact holder 6 of insulating material, a part of the casing is made in the form of a membrane 10, in the center which passes the rod 11. Contact holders 6 are connected to the rod 11 by elastic elements 14 and to the body 2 by the supports 15. The rotary contact system instead of the linear way provides an increase in the contact solution, which improves duto Q quenching and, as a result tvie, nadezhnost.2 yl Faya 9 N9 HNS /

Description

The invention relates to electrical engineering, specifically to vacuum circuit breakers.

The purpose of the invention is to increase reliability.

Figure 1 shows the proposed switch; figure 2 - section aa in figure 1.

The switch contains an insulating case consisting of two parts 1 and 2 connected by a gasket 3. Inside (the cases are fixed contacts 4 and 5 movable contacts placed on contact-holders 6 of insulating material and connected by flexible contact leads 7 with external clamps 8 and 9. The housing part 1 bears the membrane 10, in the center of which the rod 11 passes, which controls the moving contacts 5. The rod 12 limits the movement of the rod 11. The screens 13 prevent the metal from sputtering onto the inner surface of the case. ontaktoderzha- Teli 6 are connected to the rod 11 by the elastic members 14 and a part of the housing 2 through elastic supports 15. The lug 16 serving to secure the contactor extends tubulation 17 for evacuating air from the inner cavity.

The switching process in the switch is carried out by reciprocating movement of the rod 11 along the axis. The ability to move is provided by the membrane 10. The drive 35 at the same time complicates the technology of the fabrication, and it can serve as an electromagnet or manually controlled movement mechanism (not shown).

In the process of closing the contacts 4 and 5, the rod 11 moves in the direction towards the inside of the chamber. In this case, the force applied to the rod 1.1 through the elastic elements 14 is transferred to the contact holders 6, which is a lever with a large difference in arm lengths: the shoulder on the side of the rod 11 is short, on the side of contact 5 - long. As a result, a small movement of the rod 11 is converted to significant movement of the contacts 5. The flexible contact terminal 7 does not limit this movement. The contacts of the contact holder 6 with the rod 11 and with its support may be hinged. However, the elastic element 14 and the elastic support 15 exclude the presence in the vacuum of the rubbing parts. Although the elasticity of the support 15 eliminates the large bending stresses of the contact

five

The holder 6, to limit these stresses, a rod 12 is installed. In the process of opening the contacts, the rod 11 moves in the direction from to the chamber, and the rotation of the contact holder 6 takes place in the direction of the opening of the contacts 4 and 5. The opening under current is accompanied by the formation of an electric arc with sputtering of the material contacts. The screens 13, mounted on the gasket 3, prevent the deposition of sprayed metal on the inner surface of the housing parts 1 and 2. The switch is fastened by means of a protrusion 16 with an external thread, inside which the pingee 17 extends. The switch can also be mounted directly on rigid current-carrying tires with terminals 8 and 9.

The proposed design does not exclude other variants of the vacuum switch. In particular, as mentioned above, hinged fasteners of movable contact carriers can be used; contacts, but at the same time reliability is reduced due to increased wear in vacuum of the rubbing parts and the possibility of cold sealed armature. The body is made of two parts, with metallization of their connection and subsequent welding.

Making the case solid for 0

five

no switch.

The rotary contact system instead of the flow system provides an increase in the contact solution. This improves the arc conditions and increases reliability.

Claims (1)

Invention Formula A three-pole vacuum switch with one vacuum interrupter chamber, comprising a housing, three fixed contacts, the corresponding three movable 1x contacts with contact holders and bending1 | and contact pins, an axial rod connected to the movable contacts of the screen, characterized in that, in order to increase reliability, a part of the camera body is made in the form of a membrane, which is attached to the specified axial rod, and the movable contacts are mounted on contact holders that are insulated perpendicular to the indicated rod by additionally introduced elastic elements and with the camera body using the additionally introduced elastic supports. Editor O. Golovach Compiled by Y. Torshin Tehred L. Serdyukova Order 278/52 Circulation 699 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, F-33, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 2 Proofreader S. Shekmar