Axial flow fan with brushless direct current motor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 8, 2003
Grant Date -
N/A
app pub date -
Jun 9, 2000
filing date -
Jun 9, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An axial flow fan with a BLDC motor for electronic appliances is disclosed. The axial flow fan of this invention is optimally designed in axial height of both the blades and the fan housing, the number of blades, diameter ratio of the inner diameter to the outer diameter of the blades, camber ratio, pitch angle and sweep angle of the blades. The blades have an axial height higher than that of the fan housing, with a leading surface of the blades being placed outside the surface of the fan housing at a position higher than the surface of the fan housing by a predetermined projection height, thus increasing an air volume of the fan. In addition, the number of the blades is eight, with a diameter ratio of the inner diameter to the outer diameter of the fan being 0.40.about.0.45, thus reducing operational noise of the fan.
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