70MPa加氢站用隔膜压缩机二级缸盖热应力分析  

Thermal Stress Analysis for the Second Stage Cylinder Head in a Diaphragm Compressor of 70MPa Hydrogen Refueling Station

作　　者：夏一航 李云[1] 高秀峰[1] 冯诗愚[2] XIA Yi-hang;LI Yun;GAO Xiu-feng;FENG Shi-yu(School of Chemical Engineering and Technology,Xi′an Jiaotong University,Xi′an 710048,China;School of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]西安交通大学化学工程与技术学院,陕西西安710048 [2]南京航空航天大学航空学院,江苏南京210016

出　　处：《压缩机技术》2023年第1期6-10,共5页Compressor Technology

基　　金：浙江省科技计划项目(2020C01119)。

摘　　要：高压氢气压缩机是加氢站核心装置之一,其结构可靠性是保障加氢站安全的关键。基于70 MPa加氢站用隔膜压缩机的二级缸盖建立热力耦合模型,利用有限元分析温度对缸盖应力的影响。模拟结果表明缸盖最大应力所在位置在排气通道;自然冷却时最大应力比不考虑热应力时提高了104.3%,平均应力提高了86.7%,可见热应力影响显著;若对缸盖进行强制冷却,相应的最大应力可降低14.2%,而平均应力增加了23.3%,但依然在许用应力范围内。因此对缸盖进行强制冷却可以成为缓解热应力影响的方案之一。The high pressure hydrogen compressor is one of the core devices of hydrogen refueling stations, and its structural reliability is the key to ensure the safety of hydrogen refueling station. In this paper, a thermal mechanical coupling model was established based on the second stage cylinder head in a diaphragm compressor of 70MPa hydrogen refueling stations, using finite element method to study the influence of temperature on the cylinder head stress. The simulation result shows that the maximum stress of the cylinder head is located at the exhaust channel, the maximum stress is increased by 104.3% under natural cooling and the average stress is increased by 86.7% compared with that without thermal stress, which indicates that the influence of thermal stress is essential. Under forced cooling, the corresponding maximum stress is reduced by 14.2%,while the average stress is increased by 23.3%,but it is still within the range of allowable stress. Therefore, forced cooling on cylinder head can be one of the schemes to mitigate the impact of thermal stress.

关 键 词：隔膜压缩机 结构可靠性 有限元 热力耦合模型 热应力 

分 类 号：TK91[动力工程及工程热物理] TH45[机械工程—机械制造及自动化]