Combined centrifugal and vacuum pump
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United States of America Patent
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Sep 29, 1992
Grant Date -
N/A
app pub date -
Sep 7, 1990
filing date -
Sep 7, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A centrifugal pump for pumping gas containing fiber suspensions in the pulp and paper industry includes a centrifugal pumping chamber (54); a centrifugal impeller (60) within the pumping chamber; a liquid ring vacuum pump (70) having a radially vaned vacuum pump rotor (96) therein; an intermediate wall (72) separating the pumping chamber (54) from the vacuum pump (70) which has a non-annular volume (146) therein and which provides a passageway between the centrifugal pumping chamber (54) and the vacuum (70). A conduit (71) within the intermediate wall (72) is connected to the non-annular volume (146) for introducing a liquid into at least one of the non-annular volume and the vacuum pump.
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