电动汽车空调压缩机带液制冷特性研究

Research on the Cooling Performance of Electric Vehicle Air-Conditioning Compressor Under Liquid Entrainment Conditions

为研究转速变化与长时间吸气带液对电动汽车空调压缩机制冷性能的影响,本文使用依据制冷剂气体冷却法设计的压缩机性能试验台架在两种不同吸气带液工况下对转速范围(800~8500)rpm的电动涡旋压缩机制冷性能进行测试,并比对了其在转速8500 rpm的300 h不停机连续运行带液耐久试验前后性能变化。结果表明:同一工况下,制冷量随压缩机转速升高呈近线性上升,制冷性能系数随转速升高先增大后减小,约在6000 rpm时达到最大值。以最低转速运行时,制冷性能下降显著,易出现吸排气压力波动。在300 h吸气带液后,压缩机制冷性能系数约下降3.3%,且在实验过程中出现积油、积液现象,个别样品起动故障。

In order to study the influence of speed change and long-time suction with liquid refrigerant on the refrigeration performance of electric vehicle air-conditioning compressor,this paper tests the refrigeration performance of electric vehicle air-conditioning compressor with speed range of(800~8500)rpm under two different conditions by using the compressor test bench designed according to the refrigerant gas cooling method,and compares the performance changes before and after the liquid durability test of 300 h non-stop continuous operation at 8500 rpm.The results show that under the same working condition,the cooling capacity increases nearly linearly with the increase of compressor speed,and coefficient of performance(COP)increases first and then decreases with the increase of compressor speed,reaching the maximum at 6000 rpm.When operating at the lowest speed,the refrigeration performance decreases significantly,and the suction and exhaust pressure fluctuations are easy to occur.After 300 hours of suction with liquid,the COP decreased by about 3.3%,and there were oil and liquid accumulation phenomena during the experiment,causing some samples failed to start.