Fan wheel
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United States of America Patent
Stats
-
Jan 6, 2004
Grant Date -
May 22, 2003
app pub date -
Nov 16, 2001
filing date -
Nov 16, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric fan having an electric motor and a fan wheel connected to the electric motor. The fan wheel has a hub and fan blades extending from the hub. The fan blades include a proximal section at the hub, a distal section and a middle section. The proximal section has a flat surface at a trailing edge of the blade. The trailing edge at the distal section is curved with an angle of curvature of about 10.degree.. The trailing edge at the middle section is curved with an angle of curvature of about 36.degree.. When the fan wheel is rotated by the electric motor at a constant speed, air pushed by each of the fan blades is propelled at a substantially same velocity and direction from the blade measured across a radial length of the blade.
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