Quiet clutch fan blade

Details Quiet clutch fan blade Quiet clutch fan blade

1989-09-15

1990-06-05

Garrett, Robert E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

415119, 416238, B63H 118, B63H 126

Patent

active

049309900

ABSTRACT:
A clutch fan has a new and unique blade design that results in quieter and more efficient operation. The blade design involves the leading edge having inner, intermediate, and outer regions such that the intermediate region is of increasing skew in the direction of rotation and the outer region is of decreasing skew. The pitch ratio increases as a function of increasing blade radius. Along the outer region, the blade increases in pitch on a defined curvature as a function of blade radius and angle to form a tip curl.

REFERENCES:
patent: 3972646 (1976-08-01), Brown et al.
patent: 4284388 (1981-08-01), Szewalski
patent: 4358246 (1982-11-01), Hanson et al.
patent: 4684324 (1987-08-01), Perosino

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