| 摘要 |
A multiblade blower (1) includes: a first impeller (3a) arranged in a casing (2) having an air inlet (6) ; and a second impeller (3b) arranged in an internal space of the first impeller. The first impeller is a centrifugal fan including a plurality of first-impeller blades (11). The second impeller is an axial-flow fan including a plurality of second-impeller blades (14) extending radially from a rotation axis (5). In the second-impeller blades, a swirling-direction component of a wake in a region on an outer peripheral side in the internal space of the first impeller is smaller than a swirling-direction component of a wake in a region on an inner peripheral side in the internal space. |
