设计研究
文章编号：10062971(2013)04000605
隔膜压缩机三指数母线膜腔轮廓优化设计李雾阳"，贾晓晗1，江若玫，彭学院
（1.西安交通大学能源与动力工程学院，陕西西安710049;2.西安交通大学城市学院，陕西西安710018）
摘要：隔膜压缩机的膜腔轮原决定了压缩机的流量和膜片的应力分布。膜片破裂实例表明膜片径向应力过大是膜片破裂的主要原固，固此利用薄板大搅度理论对膜腔轮廉进行优化设计时，应以径向应力不超过许用应力为设计原则。对如今广泛使用的单指数母线膜腔轮廊进行了优化计算，并分析了该轮廊的特点和不足，在此基础上提出了三指数母线膜腔轮廊及其优化算法。两种轮廊的优化计算结果表明，在相同膜腔半径、相同膜片材料及膜片内应力均达到许用应力条体下，三指数母线膜腔容积相比单指数增大10.1%：在相同膜腔率径、相同膜腔容积及相同膜片材料情况下，三指数母线下的膜片最大径向应力相比单
指数降低13.5%，膜片中心区域最大径向应力降低18.3%。关键词：隔膜压缩机；膜腔轮康；萍板大挑度理论；应力中图分类号：TH45
文献标志码：A
OptimizationDesignofDiaphragmCompressorCavityContourwithNewGeneratrix LI Ji-yang'JIA Xiao-han',JIANG Ruo-mei,PENG Xue-yuan'
(1.School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China; 2.Xi'an Jiaotong University City College,Xi'an 710018, China)
Abstract:The flowrate and the stress distribution in the diaphragm are determined by the cavity contour in the diaphragm compressor. The practical application showed that the exceeded radial stress was the main reason of the diaphragm failure.To guarantee the radial stress not exceed the allowable stress should be the design principle of diaphragm compressor.In this paper,the optimization algorithm for the traditional generatrix of cavity contour was presented and the characteristics of traditional generatrix were discussed.Further-more,a new generatrix of cavity contour and its optimization algorithm were presented.The comparison results of two different genera-trix showed that the cavity volume of new generatrix was 10.1% larger than that of traditional generatrix with the same design param eters.The maximal radial stress of the diaphragm in the cavity contour with new generatrix was 13.5% less than that with traditional generatrix and the maximal radial stress in the center area decreased by18.3%.
Key words: diaphragm compressor;cavity contour;theory of thin plate with large deflection;stress
1引言
隔膜压缩机是一种完全无泄漏的容积式压缩机，特别适用于压缩稀有、贵重、易燃、有毒、腐蚀性气体和其他纯洁度要求极高的气体。由于隔膜式压缩机的特殊结构，其排气压力范围很广，可以从0.1~300MPal。因此，隔膜压缩机作为压缩机体
收稿日期：2013-0603
压够机技术
06Comprs2m
系中的一个十分重要的机型，已被广泛用于食品、医药、化工、石油、原子、国防等许多部门。
隔膜压缩机的膜腔轮廓决定了压缩机的流量以及膜片的应力分布。目前比较通用的膜腔轮廓是一种单指数母线轮廊[3，在此轮廓下膜片中心处是应力峰值区域，而轮廊中心区域的排气阀口也同时会对膜片产生附加应力，因此膜片中心处
2013年04期（总第240期）副