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随着低温下具有高比热峰值的磁性稀土材料的发现，大幅度提高Ｇ Ｍ型制冷机的性能具有了可能性。基于磁性稀土填料Ｅｒ３Ｎｉ、ＥｒＮｉ、ＧｄＲｈ 等的特性，根据热力过程分析和数值计算结果，对双级Ｇ Ｍ 型制冷机进行了重新设计、加工，使其达到了液氦温度。介绍了我们研制的４．２ Ｋ双级Ｇ Ｍ 型制冷机的设计和结构。该制冷机的最低制冷温度为２．６ Ｋ，制冷量为５８０ ｍ Ｗ／４．２ Ｋ、１ １００ ｍ Ｗ／５．０ Ｋ，热工效率高。同时简要介绍了该制冷机的应用。
With the discovery of magnetic rare earth materials with high specific heat peaks at low temperatures, it is possible to dramatically improve the performance of a G M-type refrigerator. Based on the characteristics of Er3Ni, ErNi and GdRh magnetic rare earths, the two-stage G M-type refrigerator was redesigned and processed to reach the liquid helium temperature according to the analysis of the thermodynamic process and the numerical calculation. The design and structure of the 4.2 K two-stage G M-type refrigerator we developed are introduced. The minimum refrigeration temperature of the refrigerator is 2.6 K, and the cooling capacity is 580 mW / 4.2 K and 1,100 mW / 5.0 K, and the thermal efficiency is high. At the same time a brief introduction of the application of the refrigerator.