| 摘要 |
Described is a centrifugal fan (1) comprising a centrifugal impeller (4) rotatable around an axis of rotation (R); a drive motor (3) of the centrifugal impeller (4); a casing (2) comprising a central portion (17) for housing the motor (3) and the centrifugal impeller (4) and a tangential outlet channel (18) in communication with the central portion (17); the casing (2) has an inlet opening (15) in the central portion (17) and an outlet opening (16) in the tangential outlet channel (18); the fan (1) comprises a system (4,14, 28, 29) for cooling the motor (3) comprising the impeller (4), a ventilation channel (31) operating between the tangential outlet channel (18) and the central portion (17) for generating a flow of cooling air, a collar (28) integral with the centrifugal impeller (4) extending axially from the centrifugal impeller (4) around the motor (3) and a plurality of blades of the motor (3) for generating a tangential cooling component which combines with the flow of cooling air generating as a resultant a helical vortex around the motor (3). |
