Axial flow fan having auxiliary blades

Details Axial flow fan having auxiliary blades Axial flow fan having auxiliary blades

1977-12-20

1980-02-19

Powell, Jr., Everette A.

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Casing with mounting means

416236A, 123 4149, 165122, F04D 2932

Patent

active

041892810

ABSTRACT:
An axial flow fan having auxiliary blades comprises a hub member rotatably supported and driven by a drive source, a plurality of main blades having a predetermined angle with respect to the rotational direction thereof and a predetermined width and height, the main blades being radially provided on the hub member, at least one auxiliary blade formed on at least one of a suction surface and a pressure surface of each main fan blade and having a predetermined length in the width direction of the main fan blade, a leading edge of the auxiliary blade being positioned closer to the axis of the main fan blade than a trailing edge of the auxiliary blade, a shroud comprising a thin hollow member having a large opening and a small throttled opening at opposite ends thereof, and the main fan blade being inserted within the shroud from the small throttled opening toward the large opening of the shroud. An axial inserted width L of the main fan blade, which is defined by a point of minimum opening of the small throttled opening and an inserted end portion of the inserted main fan blade in the axial direction, and an axial entire width W of the main fan blade are maintained in the following relation:

REFERENCES:
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patent: 3827482 (1974-08-01), Pope
patent: 3937189 (1976-02-01), Beck
patent: 4061188 (1977-12-01), Beck

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