| 摘要 |
PROBLEM TO BE SOLVED: To provide a land pump in which a motor part is efficiently cooled. SOLUTION: In the land pump, a motor shaft (part) 1m of the motor part M and a pump shaft (part) 1p of the pump part P are formed a coaxial shaft 1. A motor casing of the motor part M is made watertight to the shaft 1, and liquid let out of a discharge opening 4c of the pump part P is circulated on the periphery of the motor part M which drives the pump part P so as to cool the motor part M. In the shaft 1 of the pump, a flow path 1w for circulating the liquid is provided in such a manner as to establish communication with a suction opening 29a and a delivery opening 16a. COPYRIGHT: (C)2004,JPO&NCIPI
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