| 摘要 |
In a motor pump where the cooling of the motor section and the lubrication of bearings are achieved by an independent circulation system of a treating liquid by an auxiliary impeller, the pressure of a motor section, that is, the pressure of the treating liquid circulating is raised more than the suction pressure of a main process (the suction pressure of a main impeller). The treating liquid circulating from a front rotor chamber is caused to flow through a passage into an inlet port which is separated radially outside by a selected distance L from a suction inlet portion of the auxiliary impeller. This raises the pressure at the inlet port (the pressure of the front rotor chamber) to a pressure which is higher than the pressure at the suction inlet port by a magnitude corresponding to the distance L. Thus, even for a liquid which is at a high temperature and liable to be gasificated, it is possible to prevent the gasification of the circulating liquid to thereby achieve the cooling of the motor section and the lubrication of the bearings in a smooth fashion.
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