CENTRIFUGAL FAN
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United States of America Patent
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Issued Date -
Aug 7, 2014
app pub date -
Sep 21, 2012
filing date -
Sep 23, 2011
priority date (Note) -
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Abstract
A centrifugal fan includes a centrifugal impeller rotatable around an axis of rotation; a drive motor of the centrifugal impeller; a casing including a central portion for housing the motor and the centrifugal impeller and a tangential outlet channel in communication with the central portion. The casing has an inlet opening in the central portion and an outlet opening in the tangential outlet channel. The fan includes a system for cooling the motor including the impeller, a ventilation channel operating between the tangential outlet channel and the central portion for generating a flow of cooling air, a collar integral with the centrifugal impeller extending axially from the centrifugal impeller around the motor and a plurality of blades of the motor for generating a tangential cooling component which combines with the flow of cooling air and generating as a resultant, a helical vortex around the motor.
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