Axial flow fan having auxiliary blade

Details Axial flow fan having auxiliary blade Axial flow fan having auxiliary blade

1977-12-19

1980-09-16

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Irregular, flanged or channel forming blade surface

123 4149, 165122, 415213C, F04D 2938, F04D 2958

Patent

active

042227100

ABSTRACT:
An axial flow fan having an auxiliary blade wherein a hub member is rotatably supported and driven by a drive source, a plurality of blades are provided having a predetermined angle with respect to the rotational direction thereof and a predetermined width and height, the blades being radially provided on the hub member, and at least one auxiliary blade is disposed on at least one of a suction and pressure surface of the blades and extends beyond an end portion of a trailing edge thereof and substantially within a predetermined length in the width direction of the blade of the surface thereof, a leading edge of the auxiliary blade being positioned closer to an axis of the fan than a trailing edge of the auxiliary blade.
The axial flow fan having such an auxiliary blade increases the radial flow by the extending portion of the auxiliary blade.

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patent: 4128363 (1978-12-01), Fujikake et al.
patent: 4130378 (1978-12-01), Eichler

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