螺栓法兰金属垫片连接结构的紧密性分析方法  

Method for Tightness Analysis of Bolted Flanged Connections with Metallic Gaskets

作　　者：冯秀[1] 顾伯勤[2] 

机构地区：[1]南京化工职业技术学院机械技术系,江苏省流体密封与测控工程技术研究开发中心,江苏南京210048 [2]南京工业大学机械与动力工程学院,江苏南京210009

出　　处：《润滑与密封》2011年第9期95-98,106,共5页Lubrication Engineering

基　　金：国家自然科学基金资助项目(10872088);江苏高校高新技术产业发展项目(JH08-29);江苏省高校‘青蓝工程’资助

摘　　要：现行金属垫片的设计以垫片系数或线密封比压为依据,主要针对法兰强度问题,而没有定量泄漏和紧密性的概念,因此无法从理论上说明连接是否紧密。在金属垫片变截面泄漏通道的泄漏率计算公式、接触应力分布的解析算法以及连接结构变形协调分析的基础上,建立连接系统的紧密性分析方法。实例分析表明:通过增加垫片应力(即提高螺栓载荷),可降低连接的泄漏率,但当垫片应力水平较高时,效果并不显著。对于密封性要求高的连接,可以采用表面较光滑的垫片。以最大允许泄漏率为设计准则的设计方法与以强度为设计准则的规范设计方法相结合,有可能发展成为一种新的密封连接设计方法。The design of the connections with metallic gaskets in the current codes is based on the linear sealing stress,where the strength of elements is taken for design criterion, but the quantitative 1 gasket factors or the eakage and tightness are not taken into consideration. The method for the tightness analysis of bolted flanged connections with metallic gaskets was put forward based on the formula of the leakage rate, the analytical method for calculating the gasket contact stress and the load-deformation equation of connections. Analysis of examples shows that the leakage rate of connections can be re- duced by increasing the gasket contact stress （i. e. increasing bolt load） , which is not significant when the gasket contact stress is higher.. The smoother surface of gaskets can be used for higher sealing of connections. Taking both the strength of elements and the maximal allowable leakage rate for design criterion, a new design method of bolted flanged connections may be developed.

关 键 词：金属垫片 泄漏率 紧密性分析 

分 类 号：TB42[一般工业技术]