CENTRIFUGAL FAN

PROBLEM TO BE SOLVED: To suppress the rise of the temperature of an armature by efficiently supplying air to the armature. SOLUTION: In this centrifugal fan 1, an impeller part 2 fitted to a rotor part rotating relative to a stator part 31 is rotated around a center axis J1 to store the impeller part 2 in a housing formed of a housing body 11 and a cover part 12. By the rotation of the impeller part 2, air is sucked from a suction port 121 and discharged from a discharge port 13. To reduce the clearance between the impeller part 2 and a base part 12 in the centrifugal fan 1, an annular projecting part 1121 projecting to a connection plate 23 on the lower side of a blade 22 is formed on the base part 112, and a recessed part 1122 partially increasing the clearance between the connection plate 23 and the base part 112 is formed in the annular projecting part 1121. Consequently, the rise of the temperature of the armature 315 can be suppressed by efficiently supplying air to the armature 315 inside a cup part 321. COPYRIGHT: (C)2007,JPO&INPIT