Pump impeller having separate offset inlet vanes

Details Pump impeller having separate offset inlet vanes Pump impeller having separate offset inlet vanes

1995-12-26

1997-02-25

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

F01D 102

Patent

active

056054440

ABSTRACT:
A fluid impeller for a centrifugal pump includes a hub having a substantially disk-like form with a center and an edge, circular symmetry, and provision for being rotatably driven. A first plurality of pumping vanes projects substantially perpendicularly from a first surface of the hub and extends radially outwardly from a locus near the center of the hub to another locus near the edge of the hub. These vanes provide a high pressure head with a small impeller diameter. A second plurality of separate and twisted inlet vanes also projects substantially perpendicularly from the first surface of the hub and extends radially outwardly to the locus near the center of the hub from another locus nearer the center of the hub. The separate second plurality of vanes, by turning and pre-pressurizing the fluid, provides an impeller having capability of cavitation-free pumping at low net positive suction head (NPSH). A front shroud can be used which partially or totally covers the first and/or second plurality of vanes.

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