【摘要】 为满足小型超导磁体等领域对20 K温区制冷机的需求,本文进行了20 K温区单级斯特林制冷机的理论研究,通过对20 K温区高频交变流动换热机理和材料的热容、热渗透深度的影响分析,明确了20 K温区对回热器的设计准则,通过建立整机的热力学模型进行计算,计算结果表明,在铅丝丝径为24μm时,斯特林制冷机可获得的制冷量为0.65 W@20 K、1.84 W@25 K、3.02 W@30 K、4.26 W@35 K、 5.48 W@40 K。满足设备对20 K温区单级斯特林制冷机的需求。更多还原

【Abstract】 Small superconducting magnet needs low temperature of 20 K by a refrigerator to work. A 20 K single-stage Stirling refrigerator was studied and analyzed from high frequency alternating flow heat transfer mechanism, the material heat capacities and thermal penetration depth. A design method of the regenerator in the refrigerator was confirmed, a thermodynamic model was built and simulated. The results show that the available refrigeration capacity of the Stirling refrigerator is 0.65 W@20 K, 1.84 W@25 K, 3.02 W@30 K, 4.26 W@35 K and 5.48 W @ 40 K when the lead wire diameter is 24 μm, which meet 20 K requirement of small superconducting magnet.更多还原