Pneumatic evacuation pump
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United States of America Patent
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Dec 15, 2015
Grant Date -
Apr 21, 2011
app pub date -
Jun 4, 2008
filing date -
Jun 4, 2008
priority date (Note) -
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Abstract
A pneumatic evacuation pump includes an inlet assembly having an inlet valve, a charging port, and purge air injection means. A chamber includes a charge end opening to the charging port, and a discharge end. A delivery assembly includes a passage between the discharge end and a delivery outlet, a delivery valve interposed in the passage between the discharge end and the delivery outlet, and a venturi vacuum source opening to the passage between a discharge valve and the discharge end. Exhaust air injection means located downstream of the discharge valve utilizes exhaust air from the venturi vacuum source. A compressed air supply supplies the venturi vacuum source and the purge air injection means. Control means acts to coordinate a cycle of operation of the venturi vacuum source, the purge air injection means, the exhaust air injection means and the inlet and delivery valves.
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