Rheology of boundary lubricant film refrigerant atmosphere

目前正在改用无氯制冷剂，因为含有氯的氟氯化碳(氯氟碳)被认为是臭氧消耗和全球变暖的原因。然而，制冷剂的替代存在一些困难，特别是制冷剂在常用矿物油中的溶解性差和氟里昂气体的润滑性差。因此，有必要改进滑动部件的润滑设计，开发替代制冷剂的滑动材料和制冷油。滚动活塞式旋转压缩机因其体积效率高、体积小、体积小等优点，被广泛用作家用小型冰箱和空调。尽管目前制冷剂的更新换代还在进行中，但解决制冷压缩机中润滑条件最严峻的叶尖的润滑问题是必不可少的。本项目旨在开发旋转制冷压缩机的润滑设计工具，研究含有制冷剂分子的边界润滑膜的流变行为。此外，通过将测量的摩擦特性与计算的摩擦系数进行比较，估计了制冷环境中混合润滑下的边界摩擦系数，并用FT-IR显微镜对制冷环境中弹流润滑下的油膜进行了观察，以获得未知的分析参数。通过对某压气机实际测量的金属接触比与计算结果进行比较，验证了该分析方法的有效性。在此基础上，对回转式制冷压缩机的润滑状态进行了计算机模拟，为回转式制冷压缩机的润滑设计提供了依据。

It is in progress to switch to chlorine free refrigerants, since CFCs(Chloro Fluoro Carbons) containing chlorine are considered as causes of ozone depletion and global warming. However, there are several difficulties to alternate refrigerants Particularly, poor solubility of refrigerant in usual mineral oil and poor lubricity of Freon gas are serious. Therefore, it is necessary to improve the lubrication design of sliding parts and to develop the sliding materials and refrigeration oils for alternative refrigerants. A rolling piston type of rotary compressor is widely used as a small refrigerator and air-conditioner for household use because of high volumetric efficiency and compactness. Although the alternation of refrigerants is in progress now, it is indispensable to soluve the lubrication problems of vane tip which has the most severe lubrication condition in refrigerant compressors.In this project for purpose of developing lubrication design tool for rotary refrigerant compressors, rheological behavior of boundary lubricant film with refrigent molecules.In addition to that, the coefficients of boundary friction under mixed lubrication in refrigerant atmosphere are estimated by comparing the measured frictional characteristics with the calculated ones and the oil film under elastohydrodynamic lubrication in refrigerant atmosphere are observed by FT-IR microscope in order to obtain unknown parameters of the analysis. Then the validity of this analytical method is shown by comparing metal contact ratios measured for an actual compressor with those of the calculated results. After that, the computer simulations are performed for the lubrication condition in order to suggest guidelines for the lubrication design of the rotary refrigerant compressors.