论文部分内容阅读
针对当前低温超导电子、军事及空间探测等对液氦温区紧凑、长寿命、高可靠性制冷技术的需求,设计并研制了一台三级斯特林型脉管制冷机。讨论了制冷机第三级的回热器、脉管、调相机构等相关参数的设计,着重分析了液氦温区回热器长度与温度分布的特殊关系。实验中以He-4为工质,第三级在充压0.91 MPa,频率29.9 Hz,输入电功率100 W的工况下获得了4.97 K的最低无负荷温度,有制冷量25 mW@6 K。该结果首次证明了采用He-4为工质、以三级结构的斯特林脉管制冷机实现液氦温区制冷的可行性。
A three-stage Stirling-based pulse tube refrigerator was designed and developed to meet the current needs of cryogenic superconducting electrons, military and space exploration, etc., which have a compact, long-life and highly reliable refrigeration technology for liquid helium. The design of the third stage regenerator, vessel, phase modulation mechanism and other related parameters of the refrigerator is discussed. The special relationship between length and temperature distribution of the regenerator in the liquid helium temperature zone is emphatically analyzed. In the experiment, He-4 was used as the working fluid and the third stage was the lowest no-load temperature of 4.97 K under the conditions of a pressure of 0.91 MPa, a frequency of 29.9 Hz and an input electrical power of 100 W with a cooling capacity of 25 mW @ 6 K. This result proves for the first time the feasibility of using He-4 as the working fluid to achieve the liquid helium temperature cooling in a three-stage Stirling vaporizer.