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1·The paper puts forward a new type of cryogenic refrigerator proved to be nor- mal working by theoretical calculation and experimental demonstration.

在理论研究及实验论证的基础上，本文提出了一种新型的低温回热式气体制冷机。

2·When the cryogenic refrigerator works on this optimum cone Angle, the performance can be improved that means the decreasing of the lowest cooling temperature and the increasing of the cooling power.

在最佳锥度下，采用锥形脉管制冷机对改善制冷机的性能，进一步降低制冷温度、提高相同制冷温度下的制冷量是有利的。