| 摘要 |
A target fluid discharged from a pump is partially diverted, by a lead-in duct, into a housing chamber including a motor therein. A top bearing supporting a motor shaft is placed in the lead-in duct, and lubricated by the target fluid flowing through the lead-in duct. A top seal is installed downstream from the top bearing in the lead-in duct. The top seal has a slight gap from the motor shaft to form a throttle structure which increases a flow resistance. The throttle structure maintains a pressure in an area near the top bearing, to thereby suppress presence of gases.
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