CENTRIFUGAL FAN
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United States of America Patent
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N/A
Issued Date -
Oct 4, 2007
app pub date -
Mar 13, 2007
filing date -
Mar 30, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
In a centrifugal fan including a casing, a rotatable impeller disposed in the casing, a motor for driving the impeller, a control board for controlling the motor, and an ejection port for cooling air, a dust proof projection is formed to the casing to prevent invasion of dusts from the ejection port to the motor and the control board. With this simple arrangement, invasion of dusts to a coil portion and a control board of the motor can be reduced while suppressing a manufacturing cost. In this case, when the dust proof projection is disposed to a gap between the inner peripheral surface of a side wall of the casing and the outer peripheral surface of the impeller along the outer peripheral surface of the impeller in an arc-shape, a dust proof effect can be more improved.
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