| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor-driven pump with high efficiency. SOLUTION: A partition portion 23d for preventing fluid leak from a delivery port 23c to a suction port 27c is projected facing the outer periphery of an annular plate shaped impeller 28 between the suction port 27c and the delivery port 23c of a pump easing 23, and the impeller 28 is pressed onto the partition portion 23d due to force from fluid flowing through flow passages 23b, 27b.
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