| 摘要 |
<p>A plurality of fan bodies (30, 30, ...) each having a plurality of vanes (40, 40,...) that extend in the direction of the rotating shaft and are disposed at irregular pitches in a circumferential direction are disposed in a direction of a rotating shaft. The vanes (40, 40,...) are formed such that the cross-sectional configuration (4S) thereof that is perpendicular to a rotating axis O is formed into a twisted shape about the rotating axis O twisting from one end faces of the vanes (40, 40,...) toward the other end faces thereof so that the cross-sectional configurations are identical relative to the rotating axis O at any cross-sectional point. In addition, the vanes (40, 40,...) of adjacent fan bodies (30, 30, ...) are continuous and especially the vanes (40, 40,...) are formed into a twisted shape such that the twist angle becomes 60° or greater in a state in which they are caused to extend from one end to the other end of the full length of the main body.</p> |
