冷冻机油低温制热启动特性研究  

Study on the characteristics of low-temperature heating start-up of refrigeration engine oil

作　　者：柳婷婷 LIU Tingting(Guangdong Meizhi Refrigeration Equipment Co.,Ltd.Shunde 528333)

机构地区：[1]广东美芝制冷设备有限公司研发中心,广东顺德528333

出　　处：《家电科技》2024年第2期112-115,共4页Journal of Appliance Science & Technology

摘　　要：从制冷剂与油品的相溶特性角度出发,对比研究不同相溶特性条件下低温制热启动时油面变化差异,分析低温制热启动过程中制冷剂在润滑油中溶解度的变化情况,提出了针对润滑油低温启动特性的解决方案。在低温启动过程中,制冷剂溶解度随温度缓慢变化的油品(难溶油),溶解度变化减少约17%,油温上升至稳定的时间约为600 s,具有更稳定的油面;制冷剂溶解度随温度快速变化的油品(相溶油)在低温启动过程中,制冷剂溶解度减少约34%,油温上升至稳定的时间约为300 s,相比缓升型油品溶解度变化大,油温升温速率快,制冷剂由于溶解度减小而快速从油品中脱离,发生类似“闪蒸”的现象,润滑油随制冷剂大量排出压缩机,甚至会造成压缩机侧缺油。基于制冷剂溶解度陡升型与缓升型油品的差异,提出针对陡升型油品缺油现象的解决方案:降低溶解度变化率、降低油温升温速率,从而避免制冷剂大量蒸发将润滑油带离压缩机。Starting from the perspective of the solubility characteristics of refrigerants and oil,compares and studies the differences in oil surface changes during low-temperature heating start-up under different solubility characteristics conditions,and analyzes the changes in the solubility of refrigerants in oil during low-temperature heating start-up,and a solution for the low-temperature start characteristics of oil was proposed.During the low-temperature start-up process,oil with a slow increase in refrigerant solubility with temperature(insoluble oil)show a decrease of about 17%in refrigerant solubility.The time for the oil temperature to rise to stability is about 600 seconds,indicating a more stable oil level.Oil with a steep increase in refrigerant solubility with temperature(soluble oil)show a decrease of about 34%in refrigerant solubility during low-temperature start-up,and the time for oil temperature to rise to stability is about 300 seconds.Compared with slow rise oil,the solubility change is greater,the oil temperature rises faster,and the refrigerant quickly separates from the oil due to the decrease in solubility,resulting in a phenomenon similar to"flash evaporation".The oil is discharged from the compressor in large quantities with the refrigerant,it may even cause oil shortage on the compressor side.Based on the difference between rapidly increasing and slowly increasing refrigerant solubility oil,a solution for the phenomenon of oil shortage in rapidly increasing refrigerant solubility oil is proposed:reduce the rate of solubility change and the rate of oil temperature rise,thereby avoiding the refrigerant from evaporating and carrying oil away from the compressor.

关 键 词：压缩机 低温制热启动 溶解度 难溶油 相溶油 

分 类 号：TM925[电气工程—电力电子与电力传动] TB6[一般工业技术—制冷工程]