| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-lift pump with low flow rate output, efficiently discharging gas accumulated in an impeller. SOLUTION: The pump comprises: a pump part 20 incorporating the impeller 14 having a plurality of blades sucking and discharging liquid; a pump case 11 housing the pump part; a rotor 15 disposed to the impeller and rotating the impeller; a stator 21a disposed on an outer peripheral side of the rotor and driving the stator 21a; a motor part 21 housing a drive circuit 21b controlling the stator; and a partition board 16 separating the motor part from the pump case to protect the motor part. A sub flow passage 24 is disposed between the rotor and the partition board to let the fluid from the blades flow therein, a water storage space 23 disposed inside the impeller so as to continuous to the sub flow passage, and at least one recirculation passage 22 is disposed to the impeller so as to recirculate the liquid in the water storage space into the blades. COPYRIGHT: (C)2008,JPO&INPIT
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