柔性石墨／编织盘根组合填料密封性能试验研究

摘要

在新型填料密封和摩擦学性能试验机上，进行柔性石墨／编织盘根组合填料的往复运动试验，考察填料的密封性能和摩擦学性能，考察轴向应力、石墨环截面形状和密度对组合填料密封性能和摩擦学性能的影响。结果表明：随着轴向应力的增加，组合填料的泄漏率有所下降，但摩擦力会显著上升，填料的磨损加剧、密封寿命大大缩短；优化柔性石墨环的截面形状能改善组合填料的综合性能，V型石墨环填料的密封性能和摩擦学性能均明显优于平口石墨环；柔性石墨环的密度对组合填料的密封性能和摩擦学性能也有重要影响，具有密度梯度的石墨环组合填料性能优于等密度石墨环填料。对于等密度的石墨环组合填料，推荐使用密度为1.5 g／cm3左右。%The sealing and tribological properties of combined packing of flexible graphite ring and braided packing ring were investigated through reciprocating motion tests on a new testing rig.The effects of axial stress,cross-section shape and density of flexible graphite ring on sealing and tribological properties were analyzed.The results show that the leakage ratio of combined packing is decreased significantly with the increase of axial stress,but the friction force is increased markedly and results in accelerated wear process,thus the service life of the packing is greatly shortened.The comprehensive per-formances of combined packing can be improved by optimizing the cross-section shape,and V-shape graphite packing has better sealing and tribological properties than flat shape graphite packing.The combined packing with a graded density has better sealing and tribological properties than the combined packing with the same density.For the combined packing with the same density,the recommended density value of graphite ring is 1.5 g/cm3 .