Centrifugal fan
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United States of America Patent
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Feb 6, 2018
Issued Date -
N/A
app pub date -
Jun 27, 2013
filing date -
Jul 5, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A centrifugal fan includes an impeller and a motor which rotates the impeller. The impeller includes an upper shroud, a lower shroud, and blades arranged therebetween. A rotor of the motor is attached to an attachment part of the lower shroud. In a section passing a rotary shaft of the impeller, the rotor and the attachment part are provided at a more outer side than a circle having a center on a line passing an upper end portion of an inlet opening at an inner side and parallel to the rotary shaft of the impeller, having a radius of 80% of a distance from the upper end portion of the inlet opening to a surface of the lower shroud below the upper end portion, and being tangent to the surface of the lower shroud or passing an end edge portion of the lower shroud.
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