| 摘要 |
An impeller of a centrifugal fan having a casing and a multi-blade impeller rotatably supported by a blade holding base in the casing, wherein when the impeller is rotated air is sucked from an air suction port formed on one side wall of the casing, and a centrifugal force is applied on the air, so that air of high pressure is taken out through an outlet formed on a portion of an outer peripheral surface of the casing. An inner peripheral surface of the impeller is formed of a conical surface having a large diameter at the suction port and a small diameter at the blade holding base. The small diameter at the blade holding base is in the range of 70 to 90% of the large diameter at the suction port. The diameter of the inner peripheral surface of the impeller is reduced linearly from a portion at the suction side to a portion at the blade holding base side.
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