节流制冷器自调机构低温形变特性分析

发布时间：2018-01-13 04:17

本文关键词：节流制冷器自调机构低温形变特性分析　出处：《低温与超导》2016年04期 　论文类型：期刊论文

【摘要】：微小型节流制冷器具有体积小、重量轻、可靠性高、启动速度快、冷端无运动部件等突出优势,在红外探测器、红外导引头以及其他电子器件冷却领域实现了大量应用。自调式节微型流制冷器特有的自调机构通过感应节流后温度变化来进行流量(制冷量)的调节,不仅能够有效利用有限的循环工质获得最大的制冷量,而且能够实现高的温度稳定性。为了实现对自调式微型节流制冷器自调机构形变的量化分析,指导自调机构波纹管选型,文中针对内充式自调机构充压波纹管建立了三维数值模型,采用变物性参数,分析了不同充注工质及不同波纹管材料下的低温条件形变特性。研究结果表明,所建立的数值分析模型预测结果与实际测量误差在5%以内,证实了模型的准确性。波纹管是自调机构发生形变的主要部件,除充注压力外,自调机构温度分布的不均匀,对于其形变特性也有一定影响。
[Abstract]:The micro throttling refrigeration apparatus has the advantages of small volume, light weight, high reliability, fast starting speed, no moving parts at the cold end, etc., in the infrared detector. Infrared seeker and other electronic devices have realized a large number of applications in the field of cooling. The self-tuning mechanism of the self-regulating micro-flow cooler adjusts the flow rate (refrigerating capacity) through the induction of temperature change after throttling. Not only the maximum refrigerating capacity can be obtained by using the limited circulating refrigerants effectively, but also the high temperature stability can be achieved. In order to realize the quantitative analysis of the self-tuning mechanism deformation of the self-adjusting micro-throttling refrigerators. In order to guide the selection of bellows of self-adjusting mechanism, a three-dimensional numerical model is established for the self-adjusting mechanism of internal charging bellows, and the variable physical parameters are adopted. The deformation characteristics of low temperature conditions under different filling fluids and bellows are analyzed. The results show that the prediction results of the established numerical analysis model and the actual measurement error are less than 5%. The corrugated tube is the main component of the self-adjusting mechanism. Besides the filling pressure, the temperature distribution of the self-adjusting mechanism is not uniform, which has a certain influence on the deformation characteristics of the self-adjusting mechanism.
【作者单位】：昆明物理研究所;西安交通大学;
【分类号】：TB65
【正文快照】： 1前言微型节流制冷器以其结构紧凑、体积小、启动迅速、干扰噪声小、可靠性高等优点,已被广泛应用于红外制导等武器系统,并同时在低温医学、低温电子、航空航天等领域得到了应用[1]。微型节流制冷器主要由节流装置和换热器两部分构成,高压高纯气体通过节流孔发生等焓膨胀,气体

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