Vacuum Ejector With Multi-Nozzle Drive Stage
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United States of America Patent
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Issued Date -
Nov 26, 2015
app pub date -
Dec 21, 2012
filing date -
Dec 21, 2012
priority date (Note) -
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Abstract
So as to reduce its size, the invention provides a multistage ejector for generating a vacuum across a first, drive stage comprising a drive nozzle array for generating drive flow of air from a compressed air source, the drive nozzle array including two or more nozzles arranged to feed respective air jets together substantially directly into a common outlet of the drive stage so as to entrain air in a volume surrounding the air jets into the drive flow in order to generate a vacuum across the drive stage, the outlet of the drive stage being the inlet of a converging-diverging nozzle of a second stage, the converging-diverging nozzle being arranged to direct said air as a second stage air jet substantially directly into an outlet of the second stage so as to entrain air in a volume surrounding the second stage air jet into the flow in order to generate a vacuum across the second stage.
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