Great-Pressure-Drop Gas Ejector with Additional Nozzle

摘要

The object of the invention is a gas ejector having great drops or jumps in pressure with a supplementary nozzle of low-pressure gas and a narrowing or insufficiently expanded supersonic nozzle of high-pressure gas. For the purpose of obtaining a higher vacuum with successive pumping out of gas from one vessel or for assuring the possibility of simultaneously pumping out of gases with different pressures from two vessels, the cut of the supplementary narrowing nozzle of lowpressure gas is located in the zone of sudden expansion of the high-pressure gas flow, where as a result of the two-dimensional character of the flow the static pressure is considerably lowered. The supplementary nozzle has axial shifting and is put into the working position after accomplishing the supersonic flow of the high-pressure gas jet at the initial part of the mixing chamber. (Author)