Most lubricant cycles in the hermetic compressor except that a portion of lubricant is discharged from the compressor along with the refrigerant in a refrigerator system when the compressor works. The amount of the lubricant entering the refrigerator's work fluid has influence on its porformance. This paper develops a test system to measure the lubricant flow-rate discharged from the compressor. The influence factors of lubricant flow rate in a hermetic reciprocating compressors using R600a as refrigerant are studied upon this experimental system. When the clearance between suction tube outlet and suction muffler inlet in a compressor changes from 4mm to 6mm the lubricant flow rate of the compressors increases slightly about 1.2%; when the viscosity of lubricant decreases from ISO 10 to ISO 7 (the kinetic viscosity changes from 10.0mm2/s to 7.0mm2/s at 40°C)the lubricant flow-rate of the compressors increases up to 51.7%; the lubricant flow-rate is more than double in a kind of compressor with oil-suction capillary compared with compressors without oibsuetion capillary, which results in the power consumption of the refrigerators equipped such compressors increasing 2%-3.5% under standard 24 hours performance test conditions.
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