Gas-blast switch
US3988554A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1975 |
| Grant date | Oct 26, 1976 |
| Priority date | — |
| Expiry date | Jul 7, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2033/908
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A gas-blast switch possessing a fixed contact and a movable contact and a blast or discharge nozzle surrounding one of the contacts, the blast nozzle having its inlet connected with the outlet of a pump compartment for an extinguishing gas, this pump compartment can be pressurized by the switch cut-off or switching-off movement, and wherein the narrowest location or throat of the blast nozzle is arranged in the direction of blowing downstream with respect to the aforementioned one contact. The outlet of the pump compartment can be closed by a check or nonreturn valve which closes in the direction of the pump compartment. The inlet of the blast nozzle is connected via a gas chamber with the outlet of the pump compartment, the outlet of the gas chamber confronting the blast nozzle can be closed by means of a further check or nonreturn valve which closes in the direction of the gas chamber. In the inlet of the gas chamber which confronts the pump compartment there opens a throughpassage emanating from the inlet of the blast nozzle, this throughpassage possessing a third check or nonreturn valve which opens in the direction towards the aforementioned inlet of the gas chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.