构建高效制冷循环是发展高效制冷系统、实现制冷行业节能减排的核心内容。传统制冷循环构建往往基于专家经验，构建的制冷循环性能因人而异，且难以获取全局最优结构。基于图论和换热器分离的方法，本文提出了含引射器的制冷循环自动构建方法，确定了引射器结构和引射式循环构型的数学化描述，建立了引射式循环的构建算法，并应用所提方法构建了适用于冷冻温区的引射式两相回热循环。结果表明：相比于经典的引射器回收膨胀功循环，能效比提升23%。

Constructing a high-efficiency refrigeration cycle is essential for developing efficient refrigeration systems and achieving energy savings and emission reductions in the refrigeration industry. The traditional approaches to constructing refrigeration cycles are often based on expert experience, resulting in subjective and suboptimal cycle structure. This paper proposes an automatic method for constructing a refrigeration cycle with an ejector based on graph theory and heat exchanger separation. The mathematical description of the ejector structure and cycle configuration are determined, and an algorithm for constructing a refrigeration cycle with an ejector is established. The proposed method is applied to construct a refrigeration cycle with an ejector and two-phase recuperator used for freezing. The constructed cycle improves the energy efficiency ratio by 23% compared to the classical refrigeration cycle with an ejector for recovering expansion work.