| 摘要 |
PURPOSE:To increase a compression ratio, by a method wherein plural step vanes are arranged in positions in the direction of radius of an impeller, and the draft passage of stators at the steps are intercommunicated in series through introduction holes. CONSTITUTION:A first step vane 3 and a second step vane 4 are installed to plural rotatable impellers 2 (2-1, 2-2) and second step vane 4 are located to plural rotatable vanes 2 (2-1, 2-2), and stators 5-7 are respectively disposed. Each stator has draft passages 8-1, 9-1, and 9-2 and has an introduction hole 11 through which the draft passages are intercommunicated in series. This enables increase of a compression ratio per one impeller between the plural impellers. |
