Canned motor pump
AssigneesNippon Shokubai Co., Ltd., Teikoku Electric Manufacturing Co., Ltd.
InventorsKazumi Akihisa, Takehiro Takashima
Life of this patent
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Abstract
A canned motor pump having an enclosing casing on the inside of a stator and a rotor on the inside of the enclosing casing, in which the interior parts of the enclosing casing communicates with the interior parts of a pump. Surfaces of supported portions on a shaft of the rotor which are contacted with the liquid flowing on the inside of the enclosing casing are treated by electrolytic polishing so that a liquid liable to polymerization or an adherent liquid can normally circulate as a circulating liquid for cooling a motor, and furthermore supporting portions which support the shaft contain bearings produced from fluororesin or glass-fiber reinforced fluororesin.
Claims5
A canned motor pump comprising:
- a pump for pumping an easily polymerized liquid;
- a pump motor comprising a stator, an enclosing casing within said stator and a rotor within said enclosing casing, said rotor including a shaft having supported portions,
- wherein said pump motor is so configured that the easily polymerized liquid flows within said enclosing casing and into contact with said supported portions, and
- wherein said supported portions comprise composite electropolished elements having a surface roughness no higher than about 0.5 .mu.m Rmax.
Dependencies are inferred from the claim text.