Abstract: The friction of the seal faces was the most important phenomenon in working process of mechanical seals for pumps. The friction factor was a key parameter for expressing the friction state of the seal faces. The relationship between friction factor and friction state of the end faces of mechanical seals was discussed from a microscopic point of view. On the self-designed computer aided testing device of the mechanical seal system, the friction factor of GY70 mechanical seal used for pumps was tested. The test results indicate that the bigger the spring pressure, the bigger the friction factor. When the spring pressure is less, the bigger [KG*4]the rotational speed, [KG*4]the [KG*4]bigger the friction factor. [KG*4]But [KG*4]when the spring pressure [KG*4]reaches about 0.086 6 MPa, the friction factor is not almost influenced by the rotational speed. When the rotational speed and spring pressure are less, the medium pressure has a less influence on the friction factor. When the rotational speed or spring pressure is bigger, the bigger the medium pressure, the less the friction factor.

Key words: Pumps ,  Mechanical seal , Friction factor ,  Friction state

摘要： 泵用机械密封在运行过程中最常见的现象是端面间的摩擦, 端面的摩擦因数是表征摩擦特性的关键
参数。从微观角度探讨了机械密封端面摩擦因数与摩擦状态的关系。在自行研制的机械密封计算机辅助试验装置
上对泵用GY70 型机械密封的端面摩擦因数进行了试验研究。结果表明, 随着弹簧比压的增大, 摩擦因数增大;当弹
簧比压较小时, 随着转速的增大, 摩擦因数以较快的速度增大, 当弹簧比压达到0.086 6 M Pa 后, 转速对摩擦因数几
乎无影响;当转速及弹簧比压都较小时, 介质压力对摩擦因数的影响很小, 当转速较大或弹簧比压较大时, 随着介质
压力的增大, 摩擦因数减小。

关键词: 泵 , 机械密封 , 摩擦因数 , 摩擦状态