共查询到19条相似文献,搜索用时 78 毫秒
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氖气斯特林制冷机具有正的固有非理想回热特性,它既使制冷机的理论制冷系数比卡诺制冷系数ε_c小,又使理论制冷量比工质在低温等温过程中所吸取的热量Q_L小,很值得注意。尤其在精度要求较高的场合,更不能不加考虑。 相似文献
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《低温学》2018
A Stirling/pulse tube hybrid cryocooler (SPC), comprised of a Stirling cryocooler as the first stage and a pulse tube cryocooler as the second stage, features the ability of shifting cooling capacity between stages by adjusting the movement of the displacer in the first stage. Such an ability allows an SPC to accommodate itself to time-varying heat loads at different temperatures, which makes it a competitive candidate in space applications. However, due to the gas coupling, there exists a significant mutual effect between stages which endows an SPC with special thermodynamic characteristics and has a significant effect on the SPC’s capability of shifting cooling capacity between stages. With the phasor analysis and the thermodynamic analysis, this paper establishes an idealized model of an SPC. The model is then used to study the effect of the second stage on the first stage and reveal the condition that an SPC is able to shift cooling capacity between stages. Also, the model is compared with a Sage numerical model and the two models are consistent on the overall trend. Though it is unable to reflect reality precisely, the idealized model can interpret the mechanism and highlight some of the essential nature of an SPC, which will eventually benefit the appropriate design of an SPC. 相似文献
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介绍了空间用斯特林制冷机的主要失效模式和失效机理,国内外寿命评价研究的状况和进展,分析了几种加速寿命评价方法.针对中国空间用制冷机寿命评价研究的现状,提出了加速寿命评价的一些见解和思路. 相似文献
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在最近研制的1台直线压缩机驱动的两极脉管制冷机的初步试验的基础上,对直线压缩机的线圈重新进行了设计和制作,解决了由于绕制圈数过多而无法输入足够电功率的问题。对冷头的热端法兰及回热器热端热交换器进行了改进,采用了微槽式水冷却器,解决了压缩热无法得到充分冷却引起的制冷机热端温度过高的问题。改进后制冷机的性能得到了显著的提高,在2.0 MPa充气压力和40 Hz频率的条件下,该制冷机获得了14.2 K的最低制冷温度。并且,第一级和第二级在97.8 K和34.9 K时,分别具有2.5 W和1 W的制冷量。 相似文献
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介绍了气动分置式斯特林制冷机性能实验样机的组成、主要结构参数和试验结果,并对试验结果进行了分析,在新型气动分置式斯特林制冷机运行中,冷头起着进行负反馈调节的桥梁作用。 相似文献
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A two-stage pulse-tube cryocooler driven by a linear compressor was designed, manufactured and tested. The compressor is a moving-magnet type and dual-opposed-piston configuration, in which a plate spring is used. The two-stage cold head is a gas-separating thermal-link configuration. The phase shifter of each stage of the cryocooler can be double-inlet or inertance-tube type. Experiments have been carried out. The linear compressor can provide a pressure ratio of 1.3-1.5. Under the conditions of 1.2 MPa charging pressure and 32 Hz frequency, the second stage of the cryocooler reached a lowest temperature of 14.2 K, and the corresponding cooling temperature of the first stage is 93.3 K. 相似文献
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基于实验分析了大冷量分置式斯特林制冷机的动力特性和热力特性,详细讨论了对制冷机性能有重要影响的参数如固有频率、工作频率、相位角、充气压力、排出器位移等.样机采用牛津型斯特林制冷机结构,在93 W输入功率下初步获得6 W/90 K的性能. 相似文献