| 摘要 |
Disclosed is a shaft of a rotator in a canned motor pump. Many contamination vent slots are formed on the outer surface of a line edge portion in a direction of the shaft of rotator. An impeller is installed in the shaft. A check ball plug whose middle portion has a hole is inserted into the edge portion of the inner hole of the shaft, so that a check ball is inserted into the inner hole. Thereby, the strength of the shaft can be higher, and contamination in the motor can be vented.
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