| 摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal fan easily manufactured and reducing noises. SOLUTION: In the centrifugal fan F of the present invention, blade units U composed of many annularly erected blades 2, and annular straightening rings 3 connecting the upper parts of many blades 2, are connected in multiple stages in the direction of the center shaft of the blade units U, and a disk-like base 1 having raised center is connected to the lower part of the blade unit U in the lowermost stage. The inside diameters of the multistage blade units U are reduced gradually in each stage as approaching the base 1. Straightening rings 3 in each of stages are not overlapped when viewed from a center shaft direction, and the outside diameter of the base 1 is set smaller than the inside diameter of the straightening ring 3 having the smallest diameter. COPYRIGHT: (C)2008,JPO&INPIT
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