Arbitrary hub for centrifugal impellers

Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate

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Details

416188, 416235, 416236R, 415914, F04D 2928

Patent

active

052154394

ABSTRACT:
A centrifugal impeller includes a hub formed about an axis of rotation with a plurality of substantially radially extending blades affixed to the hub, each blade having a suction surface, and a pressure surface formed on the adjacent blade facing the suction surface. The blades have a height being measured in a radial direction from the hub. A portion of the hub, having a hub configuration, extends between the pressure surface and the suction surface. An imaginary plane extending in a direction normal to the axis of rotation is used to define a cross-sectional view of the impeller. A first and a second concentric circle are formed in the plane with the center of the concentric circles being the axis of rotation. The first circle passes through a point on the hub located closest to the axis of rotation. The second circle has a radius greater than the first circle by an amount equal to five percent of the blade height, wherein a portion of the hub extends outside of the second circle. This configuration has, on occasion, improved flow characteristics for centrifugal impellers over impellers having concentric hub configurations.

REFERENCES:
patent: 2735612 (1956-02-01), Hausmann
patent: 2918254 (1959-12-01), Hausamann
patent: 3481531 (1969-12-01), MacArthur et al.
patent: 3927952 (1975-12-01), Kirby
patent: 4188169 (1980-01-01), Mowill
patent: 4420288 (1983-12-01), Bischoff
patent: 4465433 (1984-08-01), Bischoff

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