小型自调式J-T制冷机波纹管刚度特性分析

发布时间：2018-04-16 11:01

本文选题：小型低温制冷机 + 自调式J-T制冷器　；参考：《低温与超导》2017年04期

【摘要】：自调式节流制冷器具有结构简单、响应速度快、稳定工作时间长等突出优势,在红外制导领域具有广泛的应用。镍基封闭充压波纹管作为自调式J-T节流制冷机的自调节机构的主要组成部分,其刚度特性对于实现稳定可靠自调过程非常重要。首先建立了自调式有限元模型,求解了波纹管刚度,进而将刚度的有限元求解结果与现有算法进行了对比分析。在此基础上,深入分析了环境温度、波纹管壁厚、波拱高度、倒角、波距等参数变化对波纹管刚度的影响,深入剖析了不同参数影响下,波纹管刚度变化规律。结果显示,有限元计算的刚度值与现有算法比起来更加准确。温度和波拱高度与刚度负相关,壁厚与刚度正相关,波纹倒角变化的影响可忽略。波距对刚度的影响并不稳定,波距在一定范围内变化时,刚度呈现先下降后上升的趋势。
[Abstract]:The self-adjusting throttling refrigeration apparatus has the advantages of simple structure, fast response speed and long stable working time. It is widely used in infrared guidance field.As the main part of self-regulating mechanism of self-regulating J-T throttling refrigerator, the stiffness characteristics of nickel base closed charging bellows are very important to realize stable and reliable self-tuning process.At first, the self-adjusting finite element model is established, and the stiffness of bellows is solved. Then, the results of finite element analysis are compared with the existing algorithms.On this basis, the effects of environmental temperature, wall thickness of corrugated tube, height of corrugated arch, chamfer and distance on the stiffness of corrugated tube are deeply analyzed, and the variation law of corrugated tube stiffness under different parameters is analyzed.The results show that the stiffness calculated by the finite element method is more accurate than the existing algorithms.The temperature and the height of the wave arch are negatively correlated with the stiffness, the wall thickness is positively correlated with the stiffness, and the influence of the corrugated chamfer is negligible.The influence of wave distance on stiffness is not stable. When the wave distance changes in a certain range, the stiffness decreases first and then increases.
【作者单位】：西安交通大学能源与动力工程学院;昆明物理研究所;
【基金】：国家自然科学基金(51406160) 中国博士后科学基金第56批面上自主(2014M560773) 中央高效基本科研业务费(2012JDGZ03)
【分类号】：TB651

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