密封唇部微观纹理方向对油封密封性能的影响

基于旋转轴密封的泵送机理,综合考虑密封唇表面三角形纹理方向的影响,建立了油封密封区域的数值计算模型,模型耦合了关于温度求解的能量守恒方程.通过迭代求解数值方程,得到唇表面三角形纹理不同方向(以三角形的重心为旋转中心,分别向右旋转0°,45°,90°,135°,180°,225°,270°,315°)时油封的泵汲率、油膜厚度、摩擦扭矩、唇口密封压力、唇口平均温度、唇口最高温度等密封性能参数,结果表明:所研究的三角形纹理的8个方向,泵汲率随方向的变化最显著,变化差值为0.783 6 mL/h,而其余密封性能参数变化值相比较小,表面纹理设计时应优先考虑三角形纹理方向对泵汲率的影响;综合考虑各项密封性能参数,三角形纹理方向为135°时油封的泵汲率、摩擦扭矩、唇口平均温度、唇口最高温度均较优,在8组不同纹理方向油封中密封性能最优.

Influence of micro-texture direction of seal lip on sealing performance of oil seal

Based on the pumping mechanism of rotating shaft seals,considering the influence of triangular texture direction on the sealing lip surface,a numerical model of oil seal sealing area was established.The model coupled the energy conservation equation for temperature solution.By solving the numerical equation iteratively,the pump suction rate,oil film thickness,friction torque,lip sealing pressure,lip average temperature and lip opening were obtained when the lip surface triangle texture was rotated in different directions(with the center of gravity of the triangle as the rotation center,and rotated to the right at 0°,45°,90°,135°,180°,225°,270°and 315°,respectively).The results show that the pump suction rate is the most affected by the direction of triangular texture,and the difference is 0.7836 mL/h.The variation of other sealing performance parameters is smaller.In surface texture design,the influence of triangular texture direction on pump suction rate should be given priority.Considering all the sealing performance parameters,when the triangle texture direction is 135°,the pump suction rate,friction torque,average lip temperature and maximum lip temperature of the oil seal are all better,the sealing performance is the best among eight groups of oil seals with different texture directions.