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基于流体压力渗透法的齿形滑环组合密封有限元分析
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石油天然气装备教育部重点实验室(西南石油大学)项目(OGE201702-12).


Finite Element Analysis of Toothshape Combined Seal Ring Based on Fluid Pressure Penetration
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    摘要:

    为准确模拟密封圈的装配安装过程的接触压力和流体压力对密封圈的作用,采用ABAQUS自动收缩配合方式仿真分析密封圈装配过程的接触静压,采用流体压力渗透载荷的加载方式模拟介质压力对密封圈的作用,研究组合密封中O形圈压缩率和工作介质压力对齿形滑环式组合密封圈密封性能的影响。研究表明:采用自动收缩配合方式能有效解决常规的位移加载方法引起的计算的接触压力不准确问题,采用流体压力渗透载荷的加载方式可自动寻找唇口接触与分离的临界点,计算高压流体加载时可得到很好的收敛解,有效解决了通过边界法加载介质压力时计算结果不准确的问题。计算结果表明:当压缩率超过一定值时,齿形滑环组合密封圈的最大Mises应力和主密封区域最大接触应力随工作介质压力的增加而增加,最大接触应力满足密封的要求;但当压缩率太低时,密封圈在高介质压力下产生较大的形变造成很大的应力集中,导致密封失效。

    Abstract:

    In order to accurately simulate the contact pressure of the sealing ring in the assembly process and the effect of fluid pressure on the sealing ring,the automatic shrink fit method of ABAQUS was used to simulate the contact static pressure of the sealing ring in the assembly process,the loading method of fluid pressure penetration was used to simulate the effect of fluid pressure on the sealing ring,and the effects of compression rate of Oring,the fluid pressure on the sealing performance of the tooth shape combined slip ring were studied.The results show that the automatic shrink fit method can effectively solve the problems of stress concentration and inaccurate calculation results of contact pressure in the assembly process by using displacement loading method,the loading method of fluid pressure penetration can find the critical point of contact and separation automatically and good convergent solution can be got under the high pressure fluid load,which effectively solve the problem that the calculation results are not accurate by boundary loading method.The calculation results show that the maximum Mises stress and maximum contact stress of the seal ring are increased with the increase of working medium pressure when the compression ratio of Oring exceeds a certain value,and the maximum contact stress meets the requirements of sealing.However,when the compression ratio is too low,the seal ring will produce large deformation under high medium pressure,which will cause great stress concentration and lead to the failure of seal.

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张晓东,杨林,张毅,彭粲粲,林梦,余鑫.基于流体压力渗透法的齿形滑环组合密封有限元分析[J].润滑与密封,2019,44(12):12-17.
. Finite Element Analysis of Toothshape Combined Seal Ring Based on Fluid Pressure Penetration[J]. Lubrication Engineering,2019,44(12):12-17.

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  • 在线发布日期: 2020-03-19
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