The paper presents the results of wear testing of friction nodes in an actual refrigeration compressor. The tests were performed on a test bench consisting of actual refrigeration system components. This device allows for the simulation of various adverse compressor operating conditions. Studies were conducted on the impact of the presence of an oil and liquid refrigerant mixture in the compressor on surface wear, as well as the impact of the presence of hot refrigerant gases in the compressor crankcase on the wear of friction nodes. The following moving parts of the compressor were selected for wear analysis: the piston, the piston cylinder, and the crankshaft surfaces. The paper includes a comparison of surface roughness profiles before and after the test trials.Depending on the oils and refrigerants used, refrigeration compressors can be exposed to various wear processes [3, 4, 5]. Damage to compressor components can be caused by a lack of oil, compressor overheating, liquid slugging, or starting a compressor flooded with liquid refrigerant. An improperly selected oil for the refrigerant can lead to inadequate lubrication. A mixture of oil and refrigerant is then formed.
The oil-refrigerant system is characterized by complex dependencies. If mutual miscibility is exceeded, a portion of the refrigerant is absorbed by the oil. The solubility of the refrigerant in the oil depends, among other things, on the oil base. Depending on the composition of the mixture (type of oil and refrigerant), temperature, and pressure, the oil-refrigerant mixture can be single-phase or two-phase. (…)
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Source: Logistyka Magazine
Damage, refrigeration compressors, surface roughness. – PDF file for download