Propeller fan
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United States of America Patent
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-
May 20, 2003
Grant Date -
Apr 11, 2002
app pub date -
Aug 15, 2001
filing date -
Aug 30, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A propeller fan adapted to prevent abnormal air flow to thereby increase discharge of air flow but to decrease noise, the fan including a plurality of vanes, each vane fixed at a hub secured at a rotary axle, having a predetermined length toward external radial direction thereof and circumferentially spaced out at a predetermined gap, wherein each van has a cross-sectional shape like a flat surface at an external side of a leading edge thereof while an external side of a trailing edge thereof is bent with a predetermined radius of curvature (Rc).
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