This paper presents the results of a study on the wear of friction nodes in an actual refrigeration compressor operating in a mixture of oil and liquid refrigerant. The tests were conducted on a test bench consisting of actual refrigeration components. This device allows for the simulation of adverse compressor operating conditions, including, among others, “flooding” the compressor with liquid refrigerant. The following moving parts of the compressor were selected for wear analysis: the crankshaft journal, the piston cylinder, and the piston. The wear analysis consisted of comparing surface roughness profiles before and after the test trial.The surfaces of moving parts in refrigeration compressors can be exposed to various types of wear processes depending on the oils and refrigerants used [3, 4, 5]. The causes of mechanical damage to compressors include lack of oil, compressor overheating, liquid slugging, starting a flooded compressor, and flooding with liquid refrigerant. Improper lubrication is most often caused by the use of an improperly selected oil for the refrigerant. A mixture of oil and refrigerant is then formed. (…)
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Source: Logistyka Magazine 3/2011