Fan with blades having integral rotating venturi

Details Fan with blades having integral rotating venturi Fan with blades having integral rotating venturi

1997-05-30

1999-07-27

Lopez, F. Daniel

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Casing with axial flow runner

4152682, 416189, F01D 502

Patent

active

059279443

ABSTRACT:
A low noise fan reduces the production of turbulent vortices created by the passage of the fan's blade tips through the air by providing an annular venturi that is attached at its inner surface to the blade tips, and that thus rotates with those blades as a unit. This prevents high pressure air at the blade tips from spilling into low pressure air. The outer surface of the rotating venturi may have a close fit against the inner surface of an outer annular stationary housing of the fan, to minimize any acoustic or mechanical mischief created by the otherwise exposed outer surface of the rotating venturi.

REFERENCES:
patent: 4358245 (1982-11-01), Gray
patent: 4548548 (1985-10-01), Gray, III
patent: 5342167 (1994-08-01), Rosseau
patent: 5445215 (1995-08-01), Herbert
patent: 5577888 (1996-11-01), Capdevila et al.
"Propshot" packaging material with instructions printed on the back, showing a fan-like blade having an annular rim surrounding the blades and joined to the blades at the tips thereof. Purchased at Wal-Mart in Colorado on May 29, 1997 by the Agent of Record, E.L. Miller.

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