共查询到19条相似文献,搜索用时 234 毫秒
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采用单压缩机驱动双冷指脉冲管制冷机可以减少结构尺寸,并同时在两个温区获得制冷效果,双冷指共用一个气库可以在一定程度上进一步减少制冷机布置空间。为研究双冷指共用气库的可行性及气库体积的影响,针对两台脉冲管冷指,在优化设计惯性管后,选取4种共用气库体积(180 cm~3、140 cm~3、100 cm~3和60 cm~3)探究了制冷性能的变化情况。结果表明当两台脉冲管冷指的制冷温度和制冷量变化时,制冷效率与气库体积存在一定的耦合匹配关系,在一定运行条件下选取较小的气库体积可以获得较高的制冷效率。 相似文献
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高频微型非金属脉冲管制冷机轴向导热损失的计算分析 总被引:1,自引:1,他引:0
针对所开发的高频微型同轴非金属脉冲管制冷机进行了轴向导热损失的计算与分析,并与相同几何尺寸的金属脉冲管制冷机进行了比较。仅从降低轴向导热损失的角度讲,使用低导热率的非金属材料制作制冷机部件对制冷性能有较大的积极作用。对于2台实验样机而言,通过蓄冷器和脉冲管内的气体的轴向导热损失已经超出通过各自管壁的轴向导热而成为最大的导热损失项,但通过蓄冷填料的轴向导热损失却成为三项损失中一个可以忽略的小量,这是非金属脉冲管制冷机区别于相同几何尺寸的常规金属脉冲管制冷机的显著特点。 相似文献
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《低温学》2018
Miniature pulse tube cryocooler is one of the main developing trends of pulse tube cryocooler. Four pulse tube cold fingers, two compressors and a series of inerance tube assemblies are employed to carry out the experimental investigation of coupling characteristic of miniature pulse tube cryocooler. It is concluded that the cooling performance of miniature pulse tube cryocooler is determined by the match conditions among its compressor, cold finger and inertance tube. If the three parts of cooler match well, the cold finger can achieve nearly same cooling performance under two totally different working conditions. 相似文献
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A three-stage Stirling pulse tube cryocooler operating below the critical point of helium-4 总被引:1,自引:0,他引:1
Precooled phase shifters can significantly enhance the phase shift effect and further improve the performance of pulse tube cryocoolers. A separate three-stage Stirling pulse tube cryocooler (SPTC) with a cold inertance tube was designed and fabricated. Helium-4 instead of the rare helium-3 was used as the working fluid. The cryocooler reached a bottom temperature of 4.97 K with a net cooling power of 25 mW at 6.0 K. The operating frequency was 29.9 Hz and the charging pressure was 0.91 MPa. It is the first time a refrigeration temperature below the critical point of helium-4 was obtained in a three-stage Stirling pulse tube cryocooler. 相似文献
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《低温学》2014
In some special applications, the pulse tube cryocooler must be designed as U-shape; however, the connecting tube at the cold end will influence the cooling performance. Although lots of U-shape pulse tubes have been developed, the mechanism of the influence of the connecting tube on the performance has not been well demonstrated. Based on thermoacoustic theory, this paper discusses the influence of the length and diameter of the connecting tube, transition structure, flow straightener, impedance of the inertance tube, etc. on the cooling performance. Primary experiments were carried out in two in-line shape pulse tube cryocoolers to verify the analysis. The two cryocoolers shared the same regenerator, heat exchangers, inertance tube and straightener, and the pulse tube, so the influence of these components could be eliminated. With the same electric power, the pulse tube cryocooler without connecting parts obtained 31 W cooling power at 77 K; meanwhile, the other pulse tube cryocooler with the connecting parts only obtained 27 W, so the connecting tube induced more than a 12.9% decrease on the cooling performance, which agrees with the calculation quite well. 相似文献
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《低温学》2015
This paper introduces a new type of pulse tube cryocooler, three-cold-finger pulse tube cryocooler (TCFPTC), which consists of one linear compressor and three cold fingers, i.e., CFA, CFB and CFC. Those three cold fingers are driven by the linear compressor simultaneously. This paper investigates two aspects. First, it studies the mass flow distribution among the three cold fingers by varying the input electrical power. The cooling powers of the three cold fingers at constant cooling temperatures and the cooling temperatures of the three cold fingers at constant cooling powers with various input electrical powers are investigated. Secondly, the interaction among the three cold fingers is investigated by varying the heating power of any one cold finger. Generally, if the heating power applied on one cold finger increases, with its cold head temperature rising up, the cold head temperatures of the others will decrease. But, when the cooling power of CFC has been 4 W, the cold head temperature of whichever cold finger increases, the cold head temperature of CFA or CFB will seldom change if its heating power keeps constant. 相似文献
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介绍了一款大冷量高频单级同轴脉冲管制冷机的基本结构、数值模拟和实验性能。其线性压缩机采用Redlich动磁式直线电机驱动,压缩活塞对置布置,使用板弹簧支撑和间隙密封技术,80 K温区工作时的电机效率在83%以上。膨胀机的蓄冷器和脉冲管为同轴型布置,这种结构使冷头与器件之间的耦合非常方便。使用数值软件对制冷机整机和调相部件进行数值模拟,并对模拟结果进行实验验证。对制冷机的运行频率和制冷性能进行实验研究,制冷机在210.3 W输入电功时能获得10 W/80 K的制冷性能,比卡诺效率为12.66%,运行频率为62 Hz,整机重量小于5.5 kg。 相似文献
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To achieve refrigeration at different positions, we tried out pairs of different coaxial pulse tube cryocoolers (PTCs) driven in parallel by a single compressor and set up an experimental apparatus. The refrigerating performances of different PTC combinations are investigated through simulation and experiments. The distribution of output PV power between the PTCs is analysed by comparing the refrigeration performance for single PTC operation to that of two PTCs operated in parallel. Experiments and simulation results show that a typical combination consisting of PTC1 (diameter of cold finger: 14 mm) and PTC2-1 (diameter of cold finger: 10 mm) can simultaneously achieve refrigeration capacities of around 0.5 W at 60 K and 0.5 W at 80 K. The combination of two samples (PTC2-1 + PTC2-2) of the same type of PTC shows a non-uniformity of refrigerating performances. Power distribution among the PTCs depends mainly on the size of the pulse tubes and the phase change. The length of the connection tube has significant influence on the refrigeration performances of two parallel PTCs in the experiments. 相似文献
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