摘要
文章基于非线性有限元理论,考虑密封结构的材料特性、几何形状和接触的非线性,建立了"M"形充气密封圈的平面应变有限元模型,分析了充气密封机理,得到了法向接触应力沿密封接触面的分布规律,讨论了充气压力、被密封介质压力和密封间隙对法向接触应力和密封效果的影响。结果表明,保证密封效果的法向接触应力随充气压力的增大而增大,接触横截面宽度也随之增长,在外表面中间的凹陷圆弧部分达到应力峰值;被密封介质压力使得靠近介质一侧的接触应力减小,密封面长度变短;随着密封间隙的增加,其接触应力也相应增大。为了提升充气圈的密封性能,需要结合密封圈的受力变形、环境温度、压力和材料特性等综合进行结构设计,密封圈的表面应做涂层防腐处理;选择适当的被密封介质压力和充气压力比值,既能保证密封效果又能延长充气圈的使用寿命。
Based on nonlinearity finite element theory of large deformation and contact problem,a 2D plane finite element model of M-shaped inflatable seal was derived. The seal mechanism was analyzed and the distribution rule of normal contact stress along sealing surface was obtained. The influence of loading pressure,sealed pressure and sealing gap on normal contact stress were discussed. Results showed that the normal contact stress was important to assure a safety sealing,which increased with the increase of loading pressure,reaching the peak in the middle of outside surface,and the length of sealing surface increased as well. With the action of the sealing pressure,the normal contact stress on the side of sealing media was cut down and the length of sealing surface got shortened. With the increase of sealing gap,the normal contact stress also increased. To promote the sealing performance,the structure of inflatable seal needs to be designed according to the stress deformation,environmental temperature,sealing pressure and material properties. It is needed to add a corrosion resistant coating on the surface of seals. And it is crucial to choose the suitable ratio of sealing pressure and loading pressure,which could ensure the sealing effect and prolonging the life of inflatable seals.
出处
《中国沼气》
北大核心
2016年第2期66-69,共4页
China Biogas
基金
农业部农村可再生能源开发利用重点实验室开放课题基金资助项目(2013009)
江苏省自然科学基金资助项目(BK20151073)
