Multi-stage membrane suction pump
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United States of America Patent
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Jan 14, 2014
Grant Date -
Oct 21, 2010
app pub date -
Nov 11, 2008
filing date -
Dec 1, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A multi-stage membrane suction pump having at least two pump chambers, each having a fluid inlet and a fluid outlet, and having a suction line connecting the fluid inlets. Successive pump chambers are connected via at least one connecting line such that the membrane pump upon reaching/exceeding a differential pressure in the suction line changes from a parallel operation into at least also a serial operation. In the inflow and outflow regions of the at least one connecting line, at least one check valve each is interposed, opening toward the subsequent pump stage. The check valves provided in the connecting line(s) are designed smaller compared to inlet and outlet valves of the pump chambers, and line sections of the connecting lines that open toward the neighboring pump chamber have a smaller clear line cross-section compared to the inlet and outlet valves, and are associated with the check valves.
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