Axial flow fan
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 8, 2009
Grant Date -
Sep 22, 2005
app pub date -
Mar 16, 2005
filing date -
Mar 19, 2004
priority date (Note) -
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Abstract
Blades mounted on a circumferential outer surface of a hub of an axial flow fan do not deform even when rotated at high speed, thus promoting structural stability. The direction of the sweeping angle of each blade alternately changes between the blade root and tip. A chord length between the blade leading and trailing edges gradually decreases from the blade root to an intermediate portion of the blade, and the chord length gradually increases from a predetermined position on the intermediate portion of the blade to the blade tip.
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