Y形组合密封的密封性能研究

应用ABAQUS软件建立YO组合密封的有限元模型，分别比较Y形组合密封与Y形密封、聚氨酯和丁腈橡胶2种材料的Y形组合密封，在密封区域的静态接触压力和Mises应力分布，分析O形圈截面直径对2种材料Y形组合密封性能的影响规律。结果表明：Y形组合密封在密封区域的接触压力和Mises应力均大于相同规格、材料的Y形圈，且外行程时Y形组合密封接触压力增大更明显，应力分布更均匀，验证了Y形组合密封的双重密封和改善根部抗撕裂的特性；在O形圈截面直径相同的情况下，聚氨酯组合密封外行程与内行程的最大接触压力差值远远高于丁腈橡胶组合密封，而丁腈橡胶组合密封Mises应力分布更均匀；随着O形圈截面直径的增大，聚氨酯组合密封的最大接触压力呈现先增大后减小的趋势，丁腈橡胶组合密封呈现逐渐减小的趋势，但两者的Mises应力均呈现逐渐增大的趋势，且丁腈橡胶组合密封增大更显著。研究结果为不同工作条件下密封件的选择提供了参考依据。

Research on the Sealing Performance of Y-shaped Combined Sealing

The finite element model of YO-shaped combined seal was established by ABAQUS software.The static contact pressure and Mises stress distribution in the seal area were compared between Y-shaped composite seal and Y-shaped seal,two Y-shaped composite seals made of polyurethane and nitrile rubber(NBR) materials.The influences of O-ring diameter on the performance of Y-shaped combined seal made of the two materials were analyzed.The results show that the contact pressure and Mises stress of Y-shaped combined seal in the sealing area are greater than those of Y-shaped ring with the same specification and material during the instroke and outstroke of the piston rod,and the increase of contact pressure of the Y-shaped combined seal is more obvious and the stress distribution is more uniform during the outstroke of the rod,which verifies the characteristics of the double sealing and the improvement of root tear resistance of Y-shaped combined seal.When the O-ring diameter is the same,the maximum contact pressure difference between the outstroke and instroke of the polyurethane combined seal is much higher than that of the NBR combined seal,while the Mises stress distribution of the NBR combined seal is more uniform.With the increase of the O-ring diameter,the maximum contact pressure of the polyurethane combined seal increases first and then decreases,while the maximum contact pressure of the NBR combined seal gradually decreases.But the Mises stress of both show a gradually increasing trend,and the increase in NBR combined seal is more significant.The research results provide a reference for the selection of seals under different working conditions.