化工学报 ›› 2023, Vol. 74 ›› Issue (10): 4241-4251.DOI: 10.11949/0438-1157.20230880

• 表面与界面工程 • 上一篇    下一篇

高压工况上游泵送机械密封热力变形与密封性能分析

谢玉汉1(), 孟祥铠1(), 赵文静1, 王禹衡2, 洪先志2, 彭旭东1   

  1. 1.浙江工业大学化工过程机械研究所,浙江 杭州 310032
    2.成都一通密封股份有限公司,四川 成都 610100
  • 收稿日期:2023-08-25 修回日期:2023-10-02 出版日期:2023-10-25 发布日期:2023-12-22
  • 通讯作者: 孟祥铠
  • 作者简介:谢玉汉(1999—),男,硕士研究生,xieyuhan1028@126.com
  • 基金资助:
    叶企孙科学基金项目(U2241246);浙江省自然科学基金项目(LY21E050009)

Thermal mechanical deformation and sealing performance analysis of upstream pumping mechanical seals under high-pressure conditions

Yuhan XIE1(), Xiangkai MENG1(), Wenjing ZHAO1, Yuheng WANG2, Xianzhi HONG2, Xudong PENG1   

  1. 1.Institute of Chemical Process Machinery,Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China
    2.Chengdu Yitong Seal Co. , Ltd. , Chengdu 610100, Sichuan, China
  • Received:2023-08-25 Revised:2023-10-02 Online:2023-10-25 Published:2023-12-22
  • Contact: Xiangkai MENG

摘要:

为研究高压工况下上游泵送机械密封的性能,考虑密封环与润滑液膜间的流固热力耦合作用,建立了其热弹流润滑模型,基于有限单元方法求解液膜润滑方程、密封环热传导方程和热力变形方程,采用三重迭代算法实现膜压、膜厚、温度和变形之间的耦合求解,研究了转速、密封压力和介质温度对上游泵送机械密封端面变形的影响规律,分析了热力变形作用下密封的上游泵送能力。研究结果表明,高压工况下密封端面产生了沿上游泵送方向收敛的液膜间隙,高密封压力下的力变形是主要原因,热变形部分抵消了压力变形带来的影响;随转速的增大,液膜沿上游泵送方向的收敛程度减小,上游泵送率增大,摩擦因数增大;随着密封介质压力的增大,液膜收敛程度增大,摩擦因数减小,上游泵送率大幅减小;随密封介质温度的升高,液膜收敛程度减小,摩擦因数减小,上游泵送率有所增加。研究结果可为高压上游泵送机械密封环的结构优化和设计提供理论参考。

关键词: 上游泵送机械密封, 热力变形, 热弹流润滑模型, 密封性能, 有限单元法

Abstract:

In order to study the performance of upstream pumping mechanical seal under high-pressure conditions, a thermal elasto-hydrodynamic lubrication model (TEHD) was established considering the fluid-solid thermal coupling between the sealing ring and the lubricating film. Based on the finite element method, the liquid film lubrication equation, the heat conduction equation of the sealing ring and the thermal deformation equation were solved. The triple iteration algorithm was used to obtain the coupling solution between film pressure, film thickness, temperature and deformation of the seal rings. The influence of rotational speed, sealing pressure and medium temperature on the deformation of the end face of the upstream pumping mechanical seal were investigated. And the upstream pumping capacity of the seal under mechanical and thermal deformation were analyzed. The research results indicate that under high pressure conditions, a liquid film gap converges along the upstream pumping direction at the sealing end face, and force deformation under high sealing pressure is the main reason, while thermal deformation partially offsets the impact of pressure deformation. With the increase of rotational speed, the convergence degree of liquid film along the upstream pumping direction decreases, the upstream pumping rate and the friction coefficient increases. With the increase of sealing medium pressure, the convergence degree of liquid film increases, the friction coefficient and the upstream pumping rate decreases greatly. With the increase of the temperature of the sealing medium, the convergence degree of the liquid film and the friction coefficient decreases, and the upstream pumping rate increases. The results can provide a theoretical reference for the structural optimization and design of the upstream pumping mechanical seals for high-pressure conditions.

Key words: upstream pumping mechanical seals, thermal mechanical deformation, thermal elasto-hydrodynamic lubrication model, sealing performance, finite element method

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