搭建了微型压缩机驱动的单级与自复叠耦合系统的实验台，以单级制冷系统对自复叠系统进行预冷的方式获得更低的蒸发温度。高温级工质选用R404A，低温级工质选用R290/R170/R14组成的混合工质(充注质量比为0.33/0.17/0.50),在25 ℃环境温度，获得了系统的运行特性以及环境温度和高温级预冷温度对系统性能的影响。研究表明:在157 min的降温时间内，蒸发器进口温度达到-112 ℃，出口温度达到-111 ℃并保持稳定；环境温度从15 ℃升高到32 ℃，系统所能达到的最低温度由-116.68 ℃升高到-95.31 ℃；高温级预冷温度从-27 ℃降低到-37 ℃，系统蒸发器进口温度由-91.18 ℃降低到-112.7 ℃。

In this paper,an experimental platform of a singlestage and autocascade coupling system driven by a microcompressor is built.A singlestage refrigeration system is used to precool the autocascade system to obtain a lower temperature.This paper provides a reference for the research of autocascade system driven by microcompressor.R404A is used in the precooling stage,and R290/R170/R14 is used in the lowtemperature stage (the mass ratio is 0.33/0.17/0.50).The operating characteristics of the system and the influence of ambient temperature and high temperature precooling temperature on the performance of the system are obtained at the ambient temperature of 25 ℃.The results show that the inlet temperature of the evaporator reaches -112 ℃ and the outlet temperature reaches -111 ℃ within 157 mins of cooling time,and remains stable.The minimum temperature of the system can be increased from -116.68 ℃ to -95.31 ℃ when the ambient temperature rises from 15 ℃ to 32 ℃.The precooling temperature of hightemperature stage decreases from -27 ℃ to -37 ℃,and the inlet temperature of system evaporator decreases from -91.18 ℃ to -112.7 ℃.

TB661

中广核研究院有限公司青锋计划项目（R-2018ZBQFC003）