ISSN   1004-0595

CN  62-1095/O4

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魏龙, 张鹏高, 刘其和, 金良, 房桂芳. 接触式机械密封端面摩擦系数影响因素分析与试验[J]. 摩擦学学报, 2016, 36(3): 354-361. DOI: 10.16078/j.tribology.2016.03.013
引用本文: 魏龙, 张鹏高, 刘其和, 金良, 房桂芳. 接触式机械密封端面摩擦系数影响因素分析与试验[J]. 摩擦学学报, 2016, 36(3): 354-361. DOI: 10.16078/j.tribology.2016.03.013
WEI Long, ZHANG Penggao, LIU Qihe, JIN Liang, FANG Guifang. Influencing Factors Analysis and Experiments of Friction Coefficient between the End Faces for Contact Mechanical Seals[J]. TRIBOLOGY, 2016, 36(3): 354-361. DOI: 10.16078/j.tribology.2016.03.013
Citation: WEI Long, ZHANG Penggao, LIU Qihe, JIN Liang, FANG Guifang. Influencing Factors Analysis and Experiments of Friction Coefficient between the End Faces for Contact Mechanical Seals[J]. TRIBOLOGY, 2016, 36(3): 354-361. DOI: 10.16078/j.tribology.2016.03.013

接触式机械密封端面摩擦系数影响因素分析与试验

Influencing Factors Analysis and Experiments of Friction Coefficient between the End Faces for Contact Mechanical Seals

  • 摘要: 通过理论模拟计算和试验, 研究并分析工作参数和端面形貌分形参数对接触式机械密封端面摩擦系数的影响. 依据接触式机械密封端面摩擦系数分形模型, 并考虑端面摩擦系数与端面平均温度的相互耦合关系, 通过模拟计算, 对B104a-70型机械密封端面摩擦系数的影响因素进行分析. 计算结果表明, 端面摩擦系数随着弹簧比压的增大而增大, 随着密封流体压力的增大而减小; 当转速较小时, 端面摩擦系数随着转速的增大而增大, 当转速增大到一定数值后, 端面摩擦系数则随着转速的增大而略有减小; 端面摩擦系数随着软质环端面分形维数的增大和特征尺度系数的减小而增大, 且端面越光滑增大的幅度越大. 通过在不同的弹簧比压、密封流体压力和转速下的试验对理论计算结果进行了验证, 试验密封流体为15 ℃清水. 结果表明:随着弹簧比压、密封流体压力及转速的变化, 摩擦系数理论计算值与试验值的变化规律相同; 当转速和密封流体压力均较小时, 最大相对误差为21.74%; 而当转速达到正常工作转速2 900 r/min时, 最大相对误差为5.08%.

     

    Abstract: The effects of the working parameters and the surface topography fractal parameters on friction coefficient between the end faces were studied and analyzed by theoretical calculation and experiments for contact mechanical seals. According to friction coefficient fractal model and the mutual coupling relationship between the friction coefficient and the average temperature of the end face, the influencing factors of friction coefficient were analyzed by simulation calculation for B104a-70 mechanical seal. The results indicate that the friction coefficient increased with the increase of spring pressure, and decreased with the increase of sealed medium pressure. When the rotating speed was low, the friction coefficient increased with the increase of the rotating speed, however, the friction coefficient decreased slightly with the increase of the rotating speed after it reached a certain value. The friction coefficient increased with the increase of fractal dimension and with the decrease of characteristic length scale of the soft ring. The smoother the surface was, the bigger the increasing amplitude of friction coefficient was. A series of tests were conducted on the B104a-70 mechanical seal testing device using water (15 ℃) as sealed medium for validating the theoretical results under different spring pressures and sealed medium pressures as well as at various rotating speeds. The results show that the theoretical values of friction coefficient were basically consistent with those by experiments. The maximum relative error was 21.74% when both the rotating speed and sealed medium pressure were low, while the maximum relative error was as low as 5.08% when the rotating speed reached the routine operating speed of 2 900 r/min.

     

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