High efficiency, low noise, axial flow fan

Details High efficiency, low noise, axial flow fan High efficiency, low noise, axial flow fan

1991-10-11

1993-09-14

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, 416242, 4152082, 4152112, 415220, F04D 2932, F04D 2952

Patent

active

052443477

ABSTRACT:
The fan has an outer circular band that is spaced axially rearwardly of the hub. Forwardly skewed blades extend between the band and hub. Each blade has a radially intermediate portion that has reverse curvatures, namely a radially inner section curving about a location that is axially rearwardly of the blade and a radially outer section curving about a location that is axially forwardly of the blade. The fan is disposed within an aperture of a shroud having a central mount for an electric motor that drives the fan. The shroud has radial members that extend from the edge of the shroud aperture to the hub and that contain an axial offset.

REFERENCES:
patent: 2785009 (1957-03-01), Stocking
patent: 3189982 (1965-06-01), Merz
patent: 3201857 (1965-08-01), Klonoski
patent: 3321931 (1967-05-01), Lehmkuhl
patent: 4505641 (1985-03-01), Tsuchikawa et al.
patent: 4568242 (1986-02-01), Susa et al.
patent: 4685513 (1987-08-01), Longhouse et al.
patent: 4915588 (1990-04-01), Brackett

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