潘永军 雷威 李罡 韩宗真

摘要： 某三偏心金属蝶阀在工作中承受瞬时高温、高压冲击，为探索该环境工况对蝶阀密封性能的影响，采用Ansys软件对蝶阀进行热结构间接耦合分析，研究高温、高压冲击下蝶阀的变形、应力分布和密封特性。蝶阀的温度分布结果表明瞬间的高温仅造成蝶阀温度升高0.23 K，而3.0 MPa的冲击可使得阀门密封面之间的接触应力平均增大60.0 MPa。密封比压的增大表明阀门在冲击下密封情况良好，分析结果可为特殊工况条件下三偏心蝶阀的选型与改进提供指导。

关键词： 三偏心蝶阀;高温;高压;耦合;接触应力;密封比压

Abstract： A threeeccentric metal butterfly valve withstands instantaneous high temperature and high pressure impact during operation. To explore the influence of this environmental condition on the sealing performance of the butterfly valve， the indirect thermalstructural coupling analysis of the butterfly valve is carried out by Ansys software， and then the deformation， stress distribution and sealing performance of the butterfly valve under high temperature and high pressure impact are studied. The temperature distribution results of the butterfly valve show that the instantaneous high temperature only causes the butterfly valve temperature to rise by 0.23 K， and the impact of 3.0 MPa can make the contact stress between valve sealing surfaces increase by 60.0 MPa on average. The increase of sealing pressure indicates that the valve is well sealing under the impact. The analysis results can provide guidance for the selection and improvement of threeeccentric butterfly valve under special working conditions.

Key words： threeeccentric butterfly valve;high temperature;high pressure;coupling;contact stress;sealing pressure

0 引 言

按照结构原理，蝶阀可分为中线蝶阀和偏心蝶阀2种，偏心蝶阀又可以细分为单偏心蝶阀、双偏心蝶阀和三偏心蝶阀。[1]三偏心金属蝶阀具有良好的耐高温和双向密封性能，被广泛应用于石油、电力和化工等行业。[2]国内学者针对偏心蝶阀开展大量的研究：张晓等[3]和周璟莹[4]分别进行蝶阀和球阀的低温热结构耦合分析;何庆中等[5]利用Abaqus研究不同偏心参数下三偏心蝶阀的密封性能;明友[6]和杨恒虎[7]对三偏心密封圈的偏心参数和转动干涉问题开展大量研究。但是，对高温冲击下偏心蝶阀接触应力响应的研究极少。本文针对三偏心金属蝶阀在瞬时高温高压冲击下的温度场和应力场进行计算，并通过接触应力变化分析由此引发的蝶阀密封性能问题。

1 三偏心蝶阀结构及其材料参数

1.1 三偏心蝶阀结构及其工作环境