Gas-blast switch
US4230920A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1978 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Nov 20, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2033/888
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Within a gas tight insulating housing of a gas-blast switch there are arranged a fixed contact surrounded by a blast chamber, a movable contact and a blast nozzle movable together with said movable contact. The blast nozzle is connected to a pump device containing a pump cylinder movable along with the movable contact. The pump cylinder is displaceable upon a stationary piston. Means are coupled with the pump cylinder and which means, during the course of the cut-off stroke of the gas-blast switch, are impinged by the extinguishing or quenching gas heated by the arc and augment the operation of the pump device, and thus, the cut-off movement. The means coupled with the pump cylinder incorporate an impact plate which bridges the substantially jacket or shell-shaped blast chamber between the pump cylinder and the inner wall of the insulating housing preferably up to the region of a ring-shaped or annular gap. The pressure wave emanating from the expanding, heated extinguishing gas which is preferably deflected by deflection blades impinges the impact plate which, in turn, augments the cut-off movement by means of the pump cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.