Pump and liquid supply system
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United States of America Patent
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-
Aug 3, 2010
Grant Date -
Nov 29, 2007
app pub date -
May 18, 2007
filing date -
May 24, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump includes a pump unit, a pump case, a motor unit, a plurality of guide blades forming plural guide paths in tangent directions of the impellers; and a multiplicity of return blades to form paths for collecting the liquid under pressure from the guide paths into a suction opening of a next-stage impeller. The return blades have a configuration in which a total cross sectional area of inlet openings of concave paths formed by a plurality of ribs is set to be equal to or larger than a cross sectional area of the suction port, while a total volume of the concave paths is set to be smaller than the total volume of non-path portions excluding the paths.
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