Positive-displacement rotary pump having a positive-displacement auxiliary pumping system
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United States of America Patent
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Dec 17, 2013
Grant Date -
Jan 3, 2013
app pub date -
Jun 20, 2012
filing date -
Jun 30, 2011
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Abstract
Positive-displacement auxiliary pumping systems for use in pump apparatus of different configurations are disclosed. The positive-displacement auxiliary pumping systems are included in positive-displacement rotary pumps having a casing defining a pumping cavity, an inlet port connected to the pumping cavity, a discharge port connected to the pumping cavity, and a positive-displacement auxiliary pumping port connected to the pumping cavity. Pumping elements move within the pumping cavity of the casing and define a collapsing pocket that maintains fluid communication with the positive-displacement auxiliary pumping port after the collapsing pocket is no longer in fluid communication with the discharge port.
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