| 摘要 |
PROBLEM TO BE SOLVED: To provide an elongated centrifugal fan minimizing noise by adopting a novel bearing structure. SOLUTION: An impeller rotated inside an elongated cylindrical housing 11, and a motor 13 rotationally driving the impeller, are arranged in a line in an axial direction, and the impeller 12 has a blade part with a plurality of elongate blades axially arranged at predetermined spaces along a circumferential direction. When the impeller 12 is rotated, air taken in from a suction port formed at the axial end of the housing 11 is blown off from a blowoff port formed at a part in the circumferential direction of the housing 11. A bearing part 13b constituting the motor 13 is a sleeve bearing formed by fixing either one of a shaft member 33 and a cylindrical sleeve 31 loosely fitted to the shaft member, to a rotating member 25 and fixing the other to a fixed member 24. One of the shaft member 33 and the sleeve 31 is made of ceramic, and the other is made of ceramic or metal. COPYRIGHT: (C)2005,JPO&NCIPI
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