The two methods,which are to fix sleeve or polytetrafluoroethylene ring on the shaft,were presented to protect the shaft from wear.

• 提出了在旋转轴上安装套筒或聚四氟乙烯环2个办法来避免油封对轴造成的磨损,提高了密封的可靠性,并延长了轴的使用寿命。