高温高压球阀组合结构密封性能研究  

Study on Sealing Performance of High Temperature and High Pressure Ball Valve Combination Structure

作　　者：叶建伟 叶建中 潘建瓯 曹小慧 唐成泽 胡志安 YE Jian-wei;YE Jian-zhong;PAN Jian-ou;CAO Xiao-hui;TANG Cheng-ze;HU Zhi-an(Chaoda Valves Group Co.,Ltd.,Wenzhou 325105,China)

机构地区：[1]超达阀门集团股份有限公司,浙江温州325105

出　　处：《液压气动与密封》2024年第7期68-74,共7页Hydraulics Pneumatics & Seals

摘　　要：以高温高压球阀为研究对象,通过对密封必需比压和弹簧预紧力进行理论计算,建立组合密封结构和阀座与球体接触的有限元模型,并对球阀在不同介质压力下的阀座密封面的密封特性和接触疲劳寿命进行了分析。结果表明,随着内部介质压力的增大,球阀球体与阀座上的等效应力和密封比压呈现上升趋势,最大密封比压出现的位置在密封面与球体接触的外圈边缘处。通过接触疲劳寿命分析得到结果显示,密封面与球体接触的外圈边缘处接触疲劳损伤达到最大,接触疲劳寿命最小,与最大密封比压分布位置相同,这也说明在长期工作情况下,该位置属于薄弱区域,在设计、加工和维护过程中应加以关注。Taking the high temperature and pressure ball valve as the research object,the finite element model of the contact between the valve seat and the ball is established by theoretical calculation of the necessary specific pressure and spring pre-tightening force.The sealing characteristics and contact fatigue life of the valve seat sealing surface under different medium pressures are analyzed.The analysis results show that with the increase of internal medium pressure,the equivalent stress and sealing specific pressure on the ball valve and the valve seat show an upward trend,and the maximum sealing specific pressure appears at the edge of the outer ring where the sealing surface contacts the ball.The results of contact fatigue life analysis show that the contact fatigue damage at the edge of the outer ring where the sealing surface contacts with the sphere reaches the maximum and the contact fatigue life is the minimum,which is the same as the distribution position of the maximum sealing specific pressure.This also shows that this position belongs to the weak area under long-term working conditions and should be paid attention to in the process of design,processing and maintenance.

关 键 词：密封比压 介质压力 静力学分析 疲劳寿命 

分 类 号：TB42[一般工业技术] TH134[机械工程—机械制造及自动化]