| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent a fluid from leaking to the outside while facilitating a manufacturing work. SOLUTION: A tubular casing part 21' is extended to a pump bracket 20' having an electric motor 1 installed thereon so as to form them integrally with each other, and impellers 10A, 10B, and 10C are held on an output shaft 2 of an electric motor 1 inside the casing part 21'.
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