Pump
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United States of America Patent
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Jan 3, 2017
Grant Date -
Mar 27, 2014
app pub date -
Mar 8, 2012
filing date -
Mar 9, 2011
priority date (Note) -
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Abstract
A pump varies output flow. For all cross-sections, which are vertical to the axis of rotation between axial outer positions for the cross-sectional areas of flow at the periphery of the impeller, the inner wall of the pump housing forms approximately circular profiles. The approximately circular profiles are mainly concentric and have a continuously increasing radius from one toward the other one of the axial outer positions. A tongue, which truncates the outlet or diffuser of the pump from an annulus of the pump housing, does not contact the circular profiles between the axial outer positions.
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