| 摘要 |
PROBLEM TO BE SOLVED: To improve pump efficiency by largely increasing a rotating speed of an impeller, by reducing rotational resistance of the impeller to fluid by inexpensive and simple shroud roughened surface processing. SOLUTION: This impeller structure of the pump is provided by arranging a roughened surface-shaped part 40 composed of a large number of small projections/recesses, on a shroud surface on the opposite side of a surface for arranging at least one vanes 13 of a front shroud 20 or a rear shroud 21. COPYRIGHT: (C)2009,JPO&INPIT
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