| 摘要 |
A centrifugal fan includes a scroll casing having an almost cylindrical shape. The casing consists of first and second casings. The first casing constitutes one base wall and a part of a side circumferential wall of a cylinder, and the second casing constitutes the other base wall and the remaining part of the side circumferential wall. An air inlet is formed on a center portion of the base wall of the first casing, and an exhaust port that is formed on the side circumferential wall. An impeller having many blades and a motor for driving the impeller are contained in the casing. A cylindrical partition that is formed on the inside of the base wall of the second casing over the entire circumference. The partition consists of a high partition formed in at least a region close to the exhaust port and a low partition formed in the other region.
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