W形结构缠绕垫片压缩-回弹性能的研究

在V形结构的基础上,通过简化力学模型的受力分析,建立力与变形之间的关系,从而获得W形结构的弹性变形公式。通过与V形结构弹性变形公式的比较,采用5.5 mm、6.0 mm、6.5 mm宽的平钢带进行厚度为4.5 mm标准系列缠绕垫片的合理结构设计,在确定的工艺参数（钢带切向拉紧力为14.7 N、径向压紧力0.25 MPa）和组合安装按GB 4622.3-93规定的条件下,对304＋柔性石墨内外环缠绕垫片进行压缩-回弹性能试验。结果表明：W形金属柔性石墨缠绕垫片的回弹性能优越于V形,且强度和刚度较大,在高压、危险工况、预紧载荷较大的法兰连接系统条件下使用更加安全可靠;W形金属柔性石墨缠绕垫片的回弹性高出国标十几个百分点,达到了国际先进水平。

Research for Compress-recovery Performance of Spiral Wound Gasket of W Structure

On the basis of V structure,through analyzing the press from the model of mechanics predigested,a relation between strength and transmutation was set up,and the formula of elasticity transmutation of W structure was obtained.Through comparing it with the formula of elasticity transmutation of V structure,the reasonable structure of gasket enlaced that the thickness is 4.5 mm standard series was designed by making use of even metal strip that the width is 5.5 mm,6.0 mm and 6.5 mm.By determining the technology parameter(metal strip tangential tension 14.7 N,and radial compression 0.25 MPa) and compounding setting as the standard of GB 4622.3-93,the compression-recovery performance test for inner outer ring spiral wound gaskets of 304 flexible graphite was performed.The result shows that recovery-performance of W-shape is superior to V-shape,and its strength and toughness are larger.On high pressure and danger condition,and on flange connecting system of higher pre-tighten load condition W-shape is more safe and reliable.Recovery performance of W-shape matallic flexible graphite spiral wound gasket exceeds over ten percentage on nation standard and reaches international advanced level.