The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 1982
Filed:
Feb. 11, 1980
Rudolf Graf, Obermuhen, CH;
Sprecher & Schuh AG, Aarau, CH;
Abstract
A gas-blast switch containing a stationary and a movable contact element. A blast nozzle associated with one of the contact elements possesses a blast channel, which during the course of the cut-off stroke, is freed from the other contact element. Additionally, there is provided a blast-in opening, transversely arranged with respect to the extinguishing path and opening into the blast channel. The blast-in opening has a flow cross-section which is appreciably smaller than that of the blast channel. Both the blast channel and the blast-in opening flow communicate with a pump compartment containing an extinguishing gas and which can be pressurized by the cut-off stroke of the switch. To impart an increasingly greater velocity to the gas outflowing from the blast-in opening during the cut-off stroke, and thus, to realize a more effective flow-through or turbulent movement of the extinguishing gas at the extinguishing path at the region of the blast channel, the pump compartment is divided into two pump chambers, separated from one another at the latest during the cut-off stroke. The one pump chamber feeds the blast channel, the other pump chamber the blast-in opening. Since such possesses the smaller flow-cross section the pressure increase in the other pump chamber, during the cut-off stroke, is greater, and thus, there also is increased the flow velocity of the extinguishing gas flowing out of the blast-in opening.