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• W1567747049 abstract "Refrigeration oil is supplied into a cylinder of rotary compressor in order to reduce internal leakage and to lubricate sliding parts. The oil seals the leakage flovv through clearances in the cylinder in the form of either liquid flovv or two-phase flow. In order to analyze the leakage flow in the cylinder, it is important to know how the oil is distributed in the cylinder and how the flovv pattem of the leakage at the clearance is. In this study, we made a compressor cylinder of acrylic resin for visualization, and the oil film condition in the cylinder during operation of the compressor was observed by using air as a working fluid_ In order to visualize the oil behavior clearly, we used nvo types of oil containing different dyes as a lubricant. One was red dyes and the other was fluorescent dyes. It was found that radial clearance between the cylinder and a roller was sealed by the oil normally, and gas leakage around a vane was remarkable when the oil was not supplied to a back chamber ofthe vane. ·we also observed a comb-shaped oil film on the cylinder wall. Although separation of refrigerant from the oil occurred when the oil mixed with the refrigerant entered the cylinder. fom1ation of bubbles was not observed. The fluorescence method was useful to observe the oil film distribution, and hereafter it will be possible to evaluate thickness of the oil film: based on the intensity of fluorescence. INTRODUCTION Refrigeration oil is supplied into a cylinder of rotary compressor in order to reduce internal leakage and to lubricate sliding parts. The oil seals the leakage flow through clearances in the cylinder in the form of liquid flow or two-phase flow. In order to analyze the leakage flow in the cylinder, it is Important to know how the oil is distributed in the cylinder and how the flow pattem of leakage at the clearance is. In this study, we made a compressor cylinder of acrylic resin for visualization, and the oil film condition in the cylinder during operation of the compressor was observed by using air as a working fluid. In order to visualize the oil behavior clearly, we used two types of oil containing different dyes as a lubricant. One was red dyes and the other was fluorescent dyes. In addition, vve supplied the oil mixed with refrigerant in order to investigate an influence of separation of the refrigerant from the oil on the fonnation of the oil film. EXPERIMENT Figure l shows a photograph of experimental rotary compressor whose cylinder and upper end plate were made of acrylic resin for visualization in the cylinder. Figure 2 shows a schematic view of an experimental apparatus. The compressor was driven by an external motor under the atmospheric pressure by using air as a working fluid. Lubricating oil in an oil tank was pushed out by pressure and supplied to a suction line and to an inside of roller. Flow rates of the oil were controlled by control valves, and measured by positive-displacement type flow meters. Mixture of oil and air discharged from the compressor entered an oil separator and only the air was discharged to the atmosphere. The oil in the separator was supplied to a back chamber of vane by discharge pressure. The discharge pressure was regulated by a control valve installed on a discharge line. We observed oil film distribution and leakage flow at each part in the cylinder by using a stroboscope which was synchronized with rotation of a driving shaft, and recorded them by a digital camera. In order to visualize the oil behavior clearly," @default.
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• W1567747049 date "1996-01-01" @default.
• W1567747049 modified "2023-09-27" @default.
• W1567747049 title "Observation of Oil Film Condition in a Cylinder of Rotary Compressor" @default.
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