本文简要叙述了二氧化碳制冷循环用膨胀机。膨胀机有助于恢复超临界二氧化碳循环中相当大的节流损失,有效改进循环的COP值。例如往复式、涡旋式和螺杆式膨胀机,许多大学和实验室正在广泛的研究与开发。许多膨胀机专利被公司工程师采用,这将使人们期待能实际用于系统的膨胀机尽早被开发出来。对膨胀机中超临界膨胀和超临界泄漏这类有趣现象的基本研究,被要求用来改进膨胀机的效率。 This article briefly describes the carbon dioxide refrigeration cycle expander. The expander helps to recover the considerable throttling loss in the supercritical carbon dioxide cycle and effectively improves the circulatory COP values. For example, reciprocating, vortex and screw expander, many universities and laboratories are extensive research and development. Many expander patents are adopted by company engineers, which will make one expect that the expander actually used in the system will be developed as early as possible. Basic research on such interesting phenomena as supercritical expansion and supercritical leakage in an expander is required to improve the efficiency of the expander.