消音器出口位置对滚动转子式压缩机流场影响分析

Analysis of the influence of muffler outlet setting for rotary compressor

随着压缩机小型化、高速化的发展,压缩机内部流体的速度大幅增加,高速制冷剂易将大量润滑油带离压缩机,产生高油循环率问题,这将导致压缩机能效下降,甚至可能由于润滑油不足而发生磨损故障。通过数值模拟分析某高油循环率压缩机的内部流场运行规律,发现消音器出口设置在消音器的侧面是产生高油循环率问题的主要原因,然后分析不同消音器出口位置方案,发现顶部排气口的消音器能够大幅增加定子切边回流,并通过试验测得油循环率大幅降低。数值模拟和试验表明消音器对油循环率有着重要影响,优化消音器是降低压缩机油循环率的有效途径。

With the miniaturization and high-speed development of rotary compressors,the velocity of the fluid within the compressor significantly increases.The high-speed refrigerant is prone to carrying away a large amount of lubricating oil,resulting in a high oil circulation rate.This can lead to decreased energy efficiency and even wear failure due to insufficient lubrication.Conducting numerical simulations to analyze the internal flow field behavior of a compressor with a high oil circulation rate,we found that positioning the outlet on the side of the muffler is the main reason for this phenomenon.Subsequent analysis of different outlet positions of the muffler revealed that a muffler with a top exhaust port can significantly increase the stator edge backflow,experiments confirmed that this design significantly reduces the oil circulation rate.Numerical simulations and experiments have both confirmed the significant effect of the muffler on the oil circulation rate,and optimizing the muffler is an effective method to reduce the oil circulation rate of the compressor.