超临界CO_(2)连续萃取装置不同密封结构性能比较

Comparison of Properties of Different Sealing Structures in Supercritical CO_(2) Continuous Extraction Equipment

为探究超临界CO_(2)连续萃取环境下合适的料仓用密封件,利用ANSYS软件建立O形、Y形与U杯形密封圈二维对称模型,分析推入过程中压缩量、摩擦因数影响下密封件的接触应力、等效应力和最佳推入形式,以及承压状态下密封件应力分布与应力的变化规律。结果表明:在推入过程中,O形圈拥有较好的预紧密封性能,U杯形圈的等效应力最小且应力分布均匀;随着压缩量与摩擦因数的增大,O形与Y形圈应力变化会发生波动,而U杯形圈各应力保持线性增长;承压工作状态下,唇形的Y形和U杯形密封件密封性能优于O形圈;Y形圈在高压工况下密封性能最优异,但低唇底部容易发生剪切破坏,影响其使用寿命,而U杯形圈在高压工况下密封性能表现最稳定、可靠。

In order to explore the suitable seals between seed bins and cylinder for supercritical CO_(2)continuous extraction,two-dimensional symmetrical models of O-ring,Y-ring,and U-cup-ring were established by using ANSYS software.The contact stress and equivalent stress of seals under the influence of compression and friction coefficient in the pushing process and the best push form of seals,as well as the stress distribution and change law of seals under pressure were analyzed.The results show that in the pushing process,the O-ring has better pre-tightening sealing performance,and the equivalent stress of the U-cup-ring is the smallest and the stress distribution is uniform.With the increase of compression and friction coefficient,the stress changes of the O-and Y-rings will fluctuate,while the stress of U-cup-ring will maintain linear growth.Under pressure working condition,the sealing performance of Y-ring and U-cup-ring is better than that of O-ring.The sealing performance of the Y-ring is the best under high pressure,but its bottom of low lip is prone to shear failure,which affects its service life.The sealing performance of U-cup-ring is the most stable and reliable under high pressure.