| 摘要 |
PROBLEM TO BE SOLVED: To provide an axial-flow pump, capable of realizing low noise. SOLUTION: The number of impellers 3 is set at 6-9. The sweep ratio as distance of a center position on a blade chord in a cylindrical cross section in the impeller 3 at the outermost circle from a front edge divided by distance of a center position on a blade chord in a cylindrical cross section in the impeller 3 at the innermost circle is set to be 1.5-4.0 by advancing them. COPYRIGHT: (C)2005,JPO&NCIPI
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