Axial flow fan

Details Axial flow fan Axial flow fan

1995-08-03

1998-05-26

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Axially extending shroud ring or casing

416169A, 416203, 416238, F04D 2938

Patent

active

057555575

ABSTRACT:
An axially compact axial flow fan with improved air-moving properties has a first array of fan blades that extend radially from a fan hub to a circumferential blade support member, a second array of fan blades extend from the first support member to a radially outward second circumferential blade support member. The fan blades in the second array each enjoy pitch angles that decrease from the second circumferential blade support radially along only a portion of each blade length. Thereafter, the pitch angles for the blades in the second array remains constant to the second circumferentially extending blade support member.

REFERENCES:
patent: 1232795 (1917-07-01), Hagen
patent: 1986151 (1935-01-01), Johnston
patent: 5221187 (1993-06-01), Lorea et al.
patent: 5244347 (1993-09-01), Gallivan et al.
patent: 5273400 (1993-12-01), Amr
patent: 5454695 (1995-10-01), Shah et al.

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