Multi-stage vacuum ejector with molded nozzle having integral valve elements
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United States of America Patent
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Sep 8, 2020
Grant Date -
Oct 22, 2015
app pub date -
Dec 18, 2013
filing date -
Dec 21, 2012
priority date (Note) -
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Abstract
A multi-stage ejector for generating a vacuum from a source of compressed air or fluid by passing the compressed air or fluid through a series of nozzles, accelerating and entraining the compressed air or fluid so as to form a jet flow in one or more stages and generate a vacuum across each stage. The multi-stage ejector may include a first drive stage; a second stage; and a converging-diverging nozzle provided in the series of nozzles between the first drive stage and the second stage. The multi-stage ejector, in use, may receive jet flow from the first drive stage, accelerate the jet flow to form a second stage air jet and direct the second stage air jet into an inlet of an outlet nozzle of the second stage. The converging-diverging nozzle may be formed in a molded nozzle piece mounted in the multi-stage ejector.
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