一种典型航空液压密封件的数值仿真和优化

利用ANSYS Workbench软件,建立航空液压作动器中一种常用的"O形圈+矩形滑环"组合密封件的有限元模型,研究密封件在不同压合量、温度和油压等条件下的泄漏量和摩擦力。结果表明:随压合量的增大或者温度的升高,密封圈泄漏量减小,但摩擦力增大;随油压的增大,密封圈泄漏量和摩擦力都增大;不同压合量、温度和油压条件下,活塞杆伸出时的摩擦力总是大于缩回时的。通过改变矩形滑块的结构,对组合密封件的密封性能进行优化。优化结果显示,合理地选取油液侧接触角和空气侧接触角能够明显降低泄漏量。

Numerical Analysis and Optimization Design for a Typical Aerospace Hydraulic Sealing Ring

A finite element model for " O-ring + rectangular slip ring" composite seal commonly used in aviation hydraulic actuators, was established by using the software ANSYS Workbench. The leakage and friction of the sealing ring under different squeeze, temperature and oil pressure were studied. The results show that the leakage of the seal is reduced but the friction is increased with the increase of the squeeze or the increase of the temperature. With the increase of the oil pressure, the leakage and friction of the seal are increased. Under different squeeze, temperature and oil pressure conditions, the friction of the piston rod when it is outstretched is always greater than that at the time of retraction. By changing the structure of the rectangular sliding block, the sealing performance of the combination seal was optimized. The results show that the leakage can be significantly reduced by selecting the oil side contact angle and the air side contact angle properly.