| 摘要 |
PROBLEM TO BE SOLVED: To provide an impeller 30 for a liquid pump forming a recessed part 35 on a rear face, fixing a plate-like lid member 40 covering the recessed part 35 to a seat part 36 around the recessed part 35 and capable of discharging an intrusion object in the recessed part 35 by a simple configuration to keep mass balance and prevent vibration. SOLUTION: A discharge port 43 for discharging the intrusion object in the recessed part 35 is provided in the lid member 40. This discharge port 43 is constituted by, for example, a cut-out part 42 provided at an outer peripheral fringe of the lid member 40. COPYRIGHT: (C)2006,JPO&NCIPI
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