Application of Metal C Ring in Stirling Cryocooler
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摘要: 介绍了斯特林制冷机里使用的一种新型空心金属C型密封圈的制作工艺与选材、密封特点和使用优势。针对传统的橡胶密封圈、PTFE、金属实心银丝密封圈等泄漏率高、易失效等特点，金属C型密封圈制造精度高，经过多年的测试使用和论证，该密封产品在抗强冲击和耐强辐射的环境下，依然可以实现较高的可靠性和较低的泄漏率，漏率最低则可以达到10－9 atm.cm3/s.m，可以满足斯特林制冷机泄漏率的要求。Abstract: This article introduces the manufacturing process, material selection, sealing characteristics, and sealing advantages of a new hollow metal C ring used in Stirling cryocoolers. Given the high leakage rate and ease of failure of rings made of traditional rubber, PTFE, and solid silver wire, the manufacturing accuracy of the metal C-type sealing ring is high. After years of testing, use, and demonstrations, the metal C ring has achieved high reliability and a low leakage rate under conditions of strong impact and radiation resistance. The leakage rate of the metal C-ring can reach to 10-9 atm.cm3/s.m, which meets the leakage rate requirements of Stirling cryocoolers.
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Key words:
- high pressure helium /
- metal ring /
- Stirling cryocooler /
- leakage rate
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图 9 靠密封圈表面的塑性变形，补偿法兰表面的凸凹不平和缺陷实现密封
Figure 9. Sealing relies on plasticity between C ring and flange surface defect
图 10 靠C型圈被压缩后的回弹力与法兰表面形成的弹性变形实现密封
Figure 10. Sealing relies on elasticity of C ring after compression
图 11 典型金属C型密封圈被压缩前(a)后(b)对比
Figure 11. The metal C ring before (a) and after (b) compression
表 1 斯特林制冷机中密封圈的应用工况
Table 1. Working condition of seal in Stirling Cryocooler.
Item Requirement Design Pressure/MPa 6.0 Design Temp/℃ -75 to 150 Working Pressure/MPa 1.5 to 5 Working Temp/℃ -70 to 120 Sealing Medium He 
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表 2 镍基合金718元素含量和性能参数
Table 2. Chemical composition & mechanical properties of Inconel 718
Chemical Analysis/(Wt.%) Al B C Cr Co Cu Fe Mn Mo Ni N 0.60 0.002 0.009 18.25 ＜0.01 ＜0.01 BAL 0.24 3.01 54.50 0.005 P Si S Ta Ti NbTa ＜0.005 0.05 ＜0.002 ＜0.05 1.01 5.08 Mechanical Properties Test Units Results High Low Tensile N/mm2 excellent 895 894 Yield N/mm2 excellent 470 470 Elongation, % Percent excellent 42.9 42.6 Grain Size ASTM# excellent 8 8
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