Page 89 - 《摩擦学学报》2021年第4期

第 41 卷 第 4 期 摩 擦 学 学 报 Vol 41 No 4
2021 年 7 月 Tribology Jul, 2021

DOI: 10.16078/j.tribology.2020152

干气密封推环用弹簧蓄能密封圈

工作特性研究

*
吴 杰, 陈 志 , 赵 鹏, 吉 华
(四川大学 化学工程学院，四川 成都 610065)

摘 要: 干气密封推环用密封圈关系到补偿环的浮动性和追随性. 通过建立弹簧蓄能密封圈的二维轴对称等效模
型，对有、无凸台两种结构的弹簧蓄能密封圈，模拟了不同工况下的密封特性及摩擦特性. 研究表明：两种结构弹簧
蓄能密封圈的峰值接触压力随介质压力、预压缩率的增加而增大，都具有良好的自紧密封特性. 推环微动时密封圈
的摩擦力较大，不能忽略. 推环轴向微动时，有凸台结构与无台结构的弹簧蓄能密封圈表现出不同摩擦行为；无台
弹簧蓄能密封圈，在推环沿±Z方向微动时，摩擦特性曲线相似. 而有凸台的弹簧蓄能密封圈，当推环沿Z方向微动
时，分离距离更大；推环沿-Z方向微动时，具有更小的最大静摩擦力，且滑动摩擦力与最大静摩擦力差值较小，滑动
平稳，有利于补偿环恢复到设计工作位置.
关键词: 弹簧蓄能密封圈; 密封特性; 摩擦特性; 干气密封; 数值模拟
中图分类号: TB42 文献标志码: A 文章编号: 1004-0595(2021)04–0532–11

Working Performance of Push Ring’s Spring Energized Seal

*
WU Jie, CHEN Zhi , ZHAO Peng, JI Hua

(School of Chemical Engineering, Sichuan University, Sichuan Chengdu 610065, China)
Abstract: Seal ring of the push ring in the dry gas seal is related to the floatability and tracing ability of compensated
ring. By establishing a 2-D axisymmetric equivalent model of spring energized seal ring, the sealing characteristics and
friction characteristics of spring energized seal rings with and without a boss were simulated under different working
conditions. The results showed that the maximum contact pressure of two kinds of spring energized seal rings increased
with the increase of medium pressure and precompression rate, and they had good self-tight characteristics. The friction
of the spring energized seal ring was large and not ignorable. When the push ring moved in the axial direction, the spring
energized seal rings with and without a boss structure showed different friction behaviors. When the push ring moved
along ±Z direction, the friction characteristic curves of the spring energized seal ring without a boss were similar.
However, the spring energized seal ring with a boss had a larger breakaway distance when the push ring moves in Z
direction. It had smaller maximum static friction, and the difference between sliding friction and maximum static friction
was smaller resulting in a smooth slide when the push ring moved along the -Z direction, which were beneficial for the
compensated ring to return to the designed working position.
Key words: spring energized seal ring; sealing characteristics; friction characteristics; dry gas seal; numerical simulation

作为一种非接触式密封，干气密封凭借磨损少、 轴上，补偿环组件由静环、静环密封圈和推环组成. 干
能耗低、寿命长和性能稳定等特点在压缩机等高速回 气密封中的泄漏点可分为两类，一类是密封环端面之
[1]
转机械上得到了广泛的应用 . 如图1所示，干气密封 间的气膜间隙，这是主密封；另一类是两零件之间的
主要由静环(补偿环)、动环(非补偿环)、推环、二次密 静密封点，如动环、静环和推环密封圈，称为二次辅助
封、弹簧和动环座等元件组成，动环通过动环座装在 密封. 其中，比较关键的二次辅助密封点为推环密封

Received 17 July 2020, revised 12 November 2020, accepted 14 November 2020, available online 28 July 2021.
*Corresponding author. E-mail: chenzhi19@sina.com, Tel: +86-13880267468.