Abstract
The article presents an attempt to evaluate the roughness profiles of the components of the friction nodes inrefrigeration compressors due to insufficient lubrication. The damaging impact on the compressor operationunder various unfavorable operating conditions, including with little or no lubricant at all, was analyzed for areal refrigeration system using a dedicated test stand.The Embraco Aspera NE9213GK refrigeration compressor used was originally filled in by the manufacturerwith a polyester lubricant; for the purpose of the study, the R407C lubricant was applied. An accelerateddamage-controlled procedure was carried out on the compressor by reducing the amount of lubricant insubsequent operating cycles of the system. The amount of oil was adjusted by removing lubricant duringshutdown periods using a dedicated spigot in the body of the semi-hermetic compressor casing. The testingcontinued until the refrigeration compressor seized up.The test stand was used to analyze electrical power measurements at the time of intentional damage tothe compressor caused as a result of forced absence of lubrication. Additionally, the authors analyzed surfaceroughness profiles of the compressor sliding elements prone to wear, including crankshaft journals, pistonsurface, and a cylinder surface.
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