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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 19990914-17; Leeds(GB) >Influence of refrigerant on viscosity and pressure-viscosity coefficient of refrigeration compressor lubricants
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Influence of refrigerant on viscosity and pressure-viscosity coefficient of refrigeration compressor lubricants

机译：制冷剂对制冷压缩机润滑油粘度和压力粘度系数的影响

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Following the introduction of non-chlorinated HFC (hydrofluorocarbon) refrigerants and polyolester lubricants, designers of refrigeration compressors have had to re-evaluate their knowledge of compressor bearing lubrication. The higher solubility and the lack of anti wear protection in comparison to the traditional refrigerant/lubricant mixes makes the lubrication of bearings using modern systems a much more difficult task than before. A modern twin screw compressor contains several highly loaded oil lubricated, metal-to-metal including, rolling element bearings, gears and the rotors. These types of contacts are normally referred as EHD or EHL contacts (Elastohydrodynamic-Lubrication), due to elastic deformation of the surfaces. The expected life of these contacts is closely related to the lubricant film thickness. The lubricant properties that determine the film thickness in an EHD-contact include the dynamic viscosity, η, and the pressure-viscosity coefficient, a. In a refrigeration system, both those parameters are affected by the presence of refrigerant, the actual effect depending on the proportions of oil and refrigerant. A falling ball viscometer has been used to measure the viscosity and hence determine the pressure-viscosity coefficient as a function of the amount of dissolved refrigerant. A polyolester oil was tested with refrigerants R-22, R-134a, R-410a and R-32 at 40° and 80℃, at refrigerant concentrations from 0 % to 30 % dilution. It has been shown that the Eyring equation can be used predict the pressure-viscosity coefficient of a mixture based on the molecular weight ratio of the refrigerants.
机译：引入非氯化氢HFC（氢氟烃）制冷剂和多元醇酯润滑剂后，制冷压缩机的设计者不得不重新评估他们对压缩机轴承润滑的了解。与传统的制冷剂/润滑剂混合物相比，较高的溶解度和缺乏抗磨损保护使得使用现代系统润滑轴承比以往更加困难。现代双螺杆压缩机包含数种高负荷的油润滑金属对金属，包括滚动轴承，齿轮和转子。由于表面的弹性变形，这些类型的触点通常称为EHD或EHL触点（弹性流体动力润滑）。这些触点的预期寿命与润滑剂膜的厚度密切相关。决定EHD接触膜厚度的润滑剂性质包括动态粘度η和压力-粘度系数a。在制冷系统中，这两个参数都受制冷剂的存在影响，实际效果取决于油和制冷剂的比例。落球粘度计已经用于测量粘度，并因此确定压力-粘度系数作为溶解的制冷剂的量的函数。用制冷剂R-22，R-134a，R-410a和R-32在40°和80°C，稀释度为0％至30％的制冷剂下测试了多元醇酯油。已经表明，可以使用Eyring方程式基于制冷剂的分子量比来预测混合物的压力-粘度系数。

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