Blade for fluid pump
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United States of America Patent
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-
Aug 28, 2001
Grant Date -
N/A
app pub date -
Nov 30, 1999
filing date -
Nov 30, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A blade for use with a housing to comprise a motor driven pump to be used to pump fluids. In particular, the blade is particularly useful because of high efficiencies in vacuum pumps, particularly, household vacuum cleaners having motors which may be advantageously powered using batteries. The blade involves a pair of generally conical walls enclosing therebetween a plurality of fluid flow passages. The fluid flow passages are defined in part by vanes extending between the two generally conical walls. The blade has a generally axial inlet and imparts centrifugal force to fluid elements. Because of the conical shape, the fluid moves in a direction having tangential components imparted by the vanes, radial components arising from centrifugal force and axial components because of the conical wall structure. High efficiencies are obtained by contouring the generally conical walls in different planes, including convex curves in planes containing the axis of rotation and concave curves in polar planes concentric with the axis of rotation.
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