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• W1535282012 abstract "Because of the development of Hydro FluoroCarbon (HFC), it is speculated that there will be some difficulties in lubrication at the sliding parts in compressors, especially at thevanes tip in rotary compressors and that a precise lubrication analysis and an exploit of materials for the sliding parts of compressors will be needed. In this paper, evaluations of lubricating effects at the vane tip and ratio of metal contact area, an examination of an optimum design of a vane, and an exploitation of materials for a vane were discussed respectively. First, a friction experiment under dry condition was operated to investigate a lubricating effects from the refrigerants. By this experiment, it was discovered that HFC owned somewhat of lubricating effect from fluoride, although it was smaller than that of Chloro Flu oro Carbon(CFC) and Hydro Chloro Fluoro Carbon (HCFC) from chloride. Therefore, one could say that a lubricating effect would be certainly reduced by using HFC as an alternative refrigerant. The next experiment conducted was to evaluate the ratio of metal contact area at the vane tip by measuring the electric contact resistance between the vane and the roller, and an optimum design for a vane was attempted to be made. As a result of the experiment, it was discovered that a reduction of the ratio of metal contact area was possible, however, it was awfully difficult to gain complete hydrodynamic lubrication. Therefore, an exploitation of materials for vanes was progressed by using adhesive energy on the materials, and improvements of scuffing and wear resistances were attempted by using composites of hard particles and ceramic coatings. INTRODUCTION The usage of Chloro Flu oro Carbon (CFC) and Hydro Chloro Flu oro Carbon (HCFC) for refrigerants are regulated by law in order to prevent the depletion of Ozone Layer, and exploitations of alternative refrigerants and machinery for those refrigerants are in progress. One of the most important tasks for these exploitations is keeping the reliability of compressors, and Fig. 1 summarizes a problem statement and measures to solve it. This paper discusses lubricating effects at the vane tip using HFC, an evaluation of lubricating condition at the vane tip, and also -methods to improve this condition. The compressor used for these experiments is a rotary compressor that requires very severe lubricating conditions. Background Problem Cause Measure Depletion of Ozone Layer d 1 · ti f kl a dovolopm<mtof teohnology I a e enora on o . . . by Chlorine Element r+ 1 b · ti m usage of msoluble olls u nca ng in CFC and HCFC abilities of refrigerant a development of refrigerating I I a deterioration of . r ;+ machine oil compressors' reliability a decline in solubility r+ an exploitation of materials for; I substituting refrigerants • w 4 of refrigerant in 1the sliding parts of compressors that don't contain chlorine lubricating oil ~redesigning a structure of the I sliding parts of compressors Fig. 1 A problem statement of compressors caused by substitutions of refrigerants and methods to solve it" @default.
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• W1535282012 date "1996-01-01" @default.
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• W1535282012 title "Tribological Evaluation of Rotary Compressor with HFC Refrigerants" @default.
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