液压缸活塞杆密封的泄漏量计算

根据液压缸内外行程时有杆腔油压的变化,并考虑到由活塞杆运动引起的拖曳压力,利用有限元软件AN-SYS计算了密封面上的接触压力分布,求得了外行程油液侧的最大压力梯度、内行程大气侧的最大压力梯度,从而算出了液压缸一个往复运动周期的泄漏量。计算结果表明,O形圈压缩率增加时,密封效果更好,内外行程速度比增加时,泄漏量也随之减少,当外行程速度为1 m/s、内行程速度为2 m/s时,活塞杆可将外行程时泄漏的液压油全部带回,从理论上说,液压缸就不会发生外泄漏。

The Leakage Calculation of the Cylinder Rod Sealing on Hydraulic Cylinder

According to the change of oil pressure in the chamber with cylinder rod during the draw-in and draw-out stroke,the pull pressure caused by motion of the cylinder rod into consideration,the distribution of contact pressure on the sealing surface was calculated by the finite element analysis software ANSYS.Thus,the maximum pressure gradient on the oil side of the draw-out stroke and the maximum pressure gradient on the atmosphere side of the draw-in stroke were obtained,and the leak amount of a reciprocating motion cycle of the hydraulic cylinder was calculated.According to the results,the effect of sealing is better while O-ring compressing rate increases,and the leaking is reduced while the speed ratio of the draw-in and draw-out stroke increases.When the draw-out stroke speed is 1 m/s and the draw-in stroke speed is 2 m/s,the leaking hydraulic oil in the draw-out stroke can be carried back in the draw-in stroke by the cylinder rod,and the outside leaking of hydraulic cylinder would not take place in theory.