滚动转子式压缩制冷系统润滑油的流动  

Lubricant oil flow in rolling piston compression refrigerating system

作　　者：杨丽辉[1] 陶乐仁[1] 王乐民[1] 刘效德 王晓松[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《能源研究与信息》2015年第1期43-47,共5页Energy Research and Information

基　　金：博导类联合基金资助项目(3312301001);上海市研究生创新基金资助项目(JWCXSL1201)

摘　　要：润滑油的流动对制冷系统的性能和可靠性有重要影响.建立滚动转子式压缩系统实验台,观测和研究膨胀阀出口和蒸发器出口制冷剂/油混合物的两相流流型.结果发现:在蒸发器出口处混合物的流动表现为"油渍"蠕动、"油膜"线状流、"油膜"环状流和雾状湿蒸汽流等流型;在膨胀阀出口有液气分相流和泡气分相流等流型.在一定的运行工况下,压缩机正过热度越小,"油膜"流动速度越快,越利于压缩机回油;当压缩机排气温度等于冷凝温度时,高含油量的液体节流后形成泡状流,使得系统性能恶化甚至造成压缩机损坏.The flow of lubricant oil is important for refrigeration performance and reliability.The rolling piston compression test stand was established,and the two-phase flow patterns of refrigerant/oil mixture at the exit of expansion valve and evaporator were investigated.The research showed that there are creeping oil spots,oil film string flow,oil film annular flow,and mist refrigerant flow at the outlet of the evaporator.There are the liquid-vapor flow and the forth-vapor flow at the outlet of the expansion valve.Under certain operating conditions,the smaller the positive suction superheat,the faster “oil film”flows and the easier the oil returns to the compressor.When the discharge temperature equals to the condensing temperature,the liquid refrigerant with high oil concentration will form forth flow after throttling with expansion valves, which makes the system performance worse and even damages the compressor.

关 键 词：滚动转子式压缩机 润滑油 两相流 流型 过热度 

分 类 号：TB61[一般工业技术—制冷工程] TB652