| 摘要 |
In a centrifugal blower, a centrifugal fan is housed in a scroll casing and driven by a motor. The scroll casing includes a suction scroll wall and a motor scroll wall. The scroll casing forms a scroll air passage between a first protruding portion of the suction scroll wall and a second protruding portion of the motor scroll wall. A fin is provided in the scrolled air passage as a directing member for directing a secondary flow in a direction parallel to a direction of a primary flow discharging from the centrifugal fan. The fin restricts the secondary flow from colliding with the primary flow, thereby to reduce noise due to interference of the air flows.
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