Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate
Patent
1992-08-25
1993-06-01
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Radially extending web or end plate
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
Jansen Willem
Platt Melvin
Larson James A.
Look Edward K.
Minns Michael H.
Northern Research & Engineering Corp.
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