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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.

由于含氯的 CFC（氯氟碳）被认为是造成臭氧层破坏和全球变暖的原因，因此正在转向使用无氯制冷剂。然而，替代制冷剂存在着一些困难，特别是制冷剂在普通矿物油中的溶解性差和氟里昂气体的润滑性差等问题比较严重。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用作家用小型冰箱和空调。尽管现在制冷剂的更换正在不断进行，但解决制冷剂压缩机中润滑条件最恶劣的叶片尖端的润滑问题是必不可少的。在本项目中，为了开发旋转式制冷剂压缩机的润滑设计工具，研究了制冷剂分子边界润滑膜的流变行为。除此之外，还研究了混合条件下的边界摩擦系数。通过比较测量的摩擦特性与计算的摩擦特性来估计制冷剂气氛中的润滑，并通过 FT-IR 显微镜观察制冷剂气氛中弹流润滑下的油膜以获得分析的未知参数。然后通过将实际压缩机测量的金属接触比与计算结果进行比较，证明了该分析方法的有效性。之后，对润滑条件进行计算机模拟，以便为旋转式制冷压缩机的润滑设计提供指导。