Shrouded household fan

Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with...

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Details

415210, 415219R, 416247R, F04D 2952

Patent

active

046574832

ABSTRACT:
An extremely efficient, substantially noiseless portable fan suitable for household use is provided which produces a highly focused, homogeneous stream of substantially laminar flow air to achieve effective air movement and cooling throughout an entire room. The fan includes a torus-shaped shroud, the intake portion of which has aerodynamic configuration having a precisely engineered geometry to minimize turbulence and promote laminar flow. The shroud intake portion includes an exterior angled Venturi surface, which extends toward the shroud intake orifice, to intersect with a radiused edge which joins the Venturi surface with an interior aerodynamic surface. An impeller assembly including a central bullet-shaped nose cone and a plurality of aerodynamically-configured radial blades are mounted within the shroud to further minimize turbulence and promote smooth air flow. In addition, an array of radial vanes supported within the shroud further reduces turbulence and directs the air flow from the fan in a concentrated stream.

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