电子膨胀阀壅塞特性与冷凝压力的关系

Relationship between choking flow characteristics and condensing pressure in electronic expansion valve

以新型环保制冷剂R410A为工质,实验研究了电子膨胀阀的流量随冷凝压力的变化规律。在不同的给定工况下,包括不同入口温度、过冷度和蒸发压力,分别进行一系列变冷凝压力的流量特性实验,对不同实验的结果中表现出的流量特性进行了综合对比分析,发现了电子膨胀阀内制冷剂壅塞时表现出的新特征,即增大阀前的冷凝压力与降低阀后的出口背压一样都能促发壅塞,并且两种不同壅塞促发条件造成的壅塞流量特性是一致的。在实验研究的基础上,对变冷凝压力流量特性进行了分析和总结,为制冷系统的匹配设计和运行特性的研究提供了膨胀阀相关的流量特性依据。

The characteristics of flow-versus-condensing pressure in electronic expansion valve （EEV） with R410A, a new environment-friendly refrigerant as working fluid were experimentally investigated. The tests of flow characteristics with changing condensing pressure were performed under different given running conditions, including inlet temperatures, subcoolings and evaporating pressures. The test results were compared and analyzed, and a new feature when choking occurred was found. Flow choking was triggered by the increase of condensing pressure and the decrease of back pressure, and the choking characteristics resulting from condensing and evaporating pressure respectively were identical. The flow characteristics with changing condensing pressure were analyzed and summarized according to the tests so as to provide the flow characteristics of EEV for the matching design and running characteristics study of the refrigeration system.