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超高压楔形环密封性能分析
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陕西省自然科学基础研究计划项目(2016JM5046)


Sealing Performance Analysis of Wedge Ring Seal Structure in Ultrahigh Pressure Vessel
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    摘要:

    采用接触有限元法,根据Mises屈服准则对自紧式超高压楔形密封的性能进行分析,其中筒体材料采用双线性随动强化准则,密封材料采用多线性随动强化准则。通过数值模拟得到密封系统预紧工况及工作工况下的应力分布,并对其进行线性化,将工作应力分解为一次应力、二次应力及峰值应力,根据不同类型应力的特点对密封可靠性及系统安全性进行评估。结果表明:预紧及工作工况下,密封环受力变化很小,确保了其密封能力,密封力来源经历了预紧力、预紧力与内压力之和,再到内压力的变化过程;内压作用下筒体主要承受薄膜应力,但筒体端部螺纹则承受弯曲应力,应根据相应的应力极限进行评定。

    Abstract:

    The sealing performance of selftightening wedge seal of ultrahigh pressure vessel was analyzed according to 〖JP2〗the Mises yield criterion by using the finite element method.The plasticity rule according to multilinear kinematic hardening〖JP〗 was adopted for the material of the wedge seal ring,while the plasticity rule according to bilinear kinematic hardening was adopted for the materials of vessel and others.The stress distributions of the seal system under the conditions of preloading and working were obtained by numerical simulation,and the stress was linearized by subdividing the stress into primary stress,secondary stress and peak stress,then the reliability of the seal and the safety of the system were evaluated according to the characteristics of different types of stress.The results show that the stress variation of the wedge seal ring is small between the preloading and working conditions,so that the seal performance can be ensured.The resource of the sealing force experiences the processes of preload,preload and work pressure,and the work pressure itself.The primary stress of the vessel is membrane stress,whereas the screw thread at the end of the vessel undertakes the bend stress,therefore,the stress need to be evaluated according to the corresponding stress limits.

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袁淑霞.超高压楔形环密封性能分析[J].润滑与密封,2018,43(8):54-61.
. Sealing Performance Analysis of Wedge Ring Seal Structure in Ultrahigh Pressure Vessel[J]. Lubrication Engineering,2018,43(8):54-61.

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  • 在线发布日期: 2018-09-03
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