Axial flow fan
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United States of America Patent
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-
Jun 5, 2001
Grant Date -
N/A
app pub date -
Dec 30, 1998
filing date -
Dec 30, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An axial flow fan has a hub and plural blades. Each blade extends from hub to a blade support ring and has a pitch which decreases over a first inner part of the radial extent and increases over a second outer part of the radial extent. In a preferred embodiment, the trailing edge of the blade tip and the median point of the blade root are situated on a common radial line. In a further preferred embodiment, a median point on the tip chord of the blade is disposed angularly ahead of a median point of the root chord. The fan provides improved noise performance.
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