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Rheology of boundary lubricant film refrigerant atmosphere

边界润滑膜制冷剂气氛的流变学

基本信息

批准号：
09650158
负责人：
KYOGOKU Keiji
金额：
$ 2.43万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

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.

由于含有氯的CFC（氯氟烃）被认为是臭氧层破坏和全球变暖的原因，因此正在向无氯制冷剂转变。然而，替代制冷剂存在着一些困难，特别是制冷剂在常用矿物油中的溶解性差和氟利昂气体的润滑性差。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冷冻机油。滚动活塞式旋转压缩机由于容积效率高且结构紧凑而被广泛地用作家用的小型冰箱和空调。虽然制冷剂的更新换代正在进行中，但解决制冷压缩机中润滑条件最苛刻的叶片顶端的润滑问题是不可或缺的。本项目以开发旋转式制冷压缩机润滑设计工具为目的，研究了含制冷剂分子的边界润滑膜的流变特性。此外，通过实验测量的摩擦特性与理论计算的摩擦特性的比较，估算了在制冷剂气氛下混合润滑时的边界摩擦系数，并利用FT-2000对制冷剂气氛下弹流润滑时的油膜进行了观测。红外显微镜，以获得未知参数的分析。通过实际压气机的金属接触率测量值与计算值的比较，验证了该分析方法的有效性。在此基础上，对转子式制冷压缩机的润滑状况进行了计算机模拟，为转子式制冷压缩机的润滑设计提供了依据。