| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid pump and a liquid pump system comprising simple and original performance and suitable for precedent stand-by operation. SOLUTION: This liquid pump 10 comprises a pump body 30, a fixed pipe 20 and an air flow-in mechanism 28. The pump body 30 has impellers 31, a motor 33 for rotating the impellers 31, and an impeller casing 34 surrounding to cover the impellers 31 around the rotating direction. The fixed pipe 20 has a cylindrical column pipe 21 in which the pump body 30 is housed freely to be put in and pulled out, and a suction pipe 25 fitted to a lower end of the column pipe 21 so that liquid flows upward toward the impeller 31. The fixed pipe 20 forms a lower gap 11 vertically under the impeller housing 34, and forms a side gap 12 communicating with the inside of the impeller casing 34 through the lower gap 11 outside in the horizontal direction. The air flow-in mechanism 28 supplies air to the side gap 12. COPYRIGHT: (C)2009,JPO&INPIT
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