Centrifugal fan having variable width blades

Details Centrifugal fan having variable width blades Centrifugal fan having variable width blades

1992-05-08

1993-05-04

Look, Edward K.

Rotary kinetic fluid motors or pumps

Selectively adjustable vane or working fluid control means

Upstream of runner

415158, 416184, 384 42, F04D 2946, F01D 700

Patent

active

052075575

ABSTRACT:
A centrifugal fan has blades the effective width of which are variable during fan operation through the actuation of modulation apparatus which rotates with the fan wheel and is driven thereby. The modulation apparatus isolates the blocked off and unused portions of the fan blades which prevents the interaction of the blocked off portion of the blades with air flowing through the fan housing in a manner which results in a highly efficient and extremely quiet fan.

REFERENCES:
patent: 1656012 (1928-01-01), Nagler
patent: 1834959 (1931-12-01), May
patent: 2143100 (1939-01-01), Anderson
patent: 2459815 (1949-01-01), Hammell
patent: 3019963 (1962-02-01), Eck
patent: 4135850 (1979-01-01), D'Anjou
patent: 4177007 (1979-12-01), Schlangen et al.
patent: 4808068 (1989-02-01), Asbjornson et al.
patent: 4828455 (1989-05-01), Kinbara et al.
patent: 4929150 (1990-05-01), Daw

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