Blade for axial flow fan

Details Blade for axial flow fan Blade for axial flow fan

1991-11-21

1993-01-26

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416236A, F01D 514

Patent

active

051818302

ABSTRACT:
An axial flow fan blade (11) having an enhanced tip (12, 12') to reduce or eliminate tip vortices and therefore vortex induced noise. The enhancement is a rounded body extending from the blade tip and having faired ends (15, 16) but otherwise a generally circular cross section. The body conforms to the contour of the tip and extends from the leading to the trailing edge of the blade. The body may have either a generally constant cross section (12) or a cross section that decreases from its leading to its trailing end (12' ).

REFERENCES:
patent: 2068792 (1937-01-01), Dekker
patent: 2426742 (1947-09-01), Pawlowski
patent: 3294315 (1966-12-01), Stewart et al.
patent: 4893990 (1990-01-01), Tomohiro et al.
patent: 5064346 (1991-11-01), Atarashi et al.

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