| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of cavitation at vanes of a pump. SOLUTION: This pump 10 comprises a main shaft 14 longitudinally rotatably supported inside a casing 12 and plural vanes 16 fixed on the main shaft 14 via hubs 14a arranged with a constant interval circumferentially around a rotation shaft line O of the main shaft 14 as the center. Regions I, II, III where local relative anglesβof flow along negative pressure surfaces 16 of the vanes 16 are constant in the flow directions are formed therein.
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