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US 4,543,041 AGranted
Impellor for centrifugal compressor
AssigneeHolset Engineering Company Limited
InventorsPierre B. French, Paul J. Langdon
Life of this patent
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Abstract
An impeller for a centrifugal impeller comprising a disc portion, a coaxial hub portion having a longitudinal through-bore by which the impeller is mounted on a rotatable shaft, and a plurality of blades in any one of several forms. The tip of each blade is curved in a direction opposite to the rotation of the impeller more than the rest of the blade. The radius of the tip curve decreases uniformly toward the radially outer end of the blade. This tip treatment produces improved isentropic efficiency.
Claims5
An impeller for a centrifugal compressor, said impeller comprising:
- an annular disc portion having a front face and a rear face;
- an integral coaxial hub portion rotatable about a central axis;
- and
- a plurality of blades mounted on the front face of the disc portion and on the hub portion, each blade having a leading and trailing surface;
- each of said blades having an inlet portion for substantially axial entry of fluid and a tip portion for substantially radial movement of fluid as viewed in a plane containing the central axis of said impeller, the leading surface of the tip portion curving in a direction away from the direction of tip portion movement as viewed in a plane perpendicular to the central axis of said impeller, the radius of curvature of said leading surface uniformly decreasing to a minimum radius of curvature at the outer end of said blade that is less than any curvature radially inward from said tip portion.
2 more elements
Dependencies are inferred from the claim text.