| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of voltex having the influence on the performance of a pump, and to simplify the shape of a mold to easily manufacture the mold, conventionally requiring high cost and much time. SOLUTION: Fluid is vertically sucked from a suction passage 2 by mounting the pump suction bell mouth 51 of a pump 5 on an end of the suction passage 2 formed on every pump. The parallel both side wall surfaces 7, 7, a wall surface 8 of the passage end, and a bottom surface 9 of the passage are respectively flat. An inclined ascent surface 10 of approximately 45 degree is formed on a part from the neighborhood of a lower surface of the pump suction bell mouth 51 of the bottom surface 9 to the wall surface 8 of the passage end.
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