REFRIGERATOR, ABRASIVE POWDER JUDGING DEVICE, AND REFRIGERANT OXIDATION JUDGING DEVICE

摘要

A refrigerator, comprising an oil deterioration judging container (31) disposed between a four-way directional control valve (2) and a gas closing valve (24), whereby, because a gas refrigerant containing much refrigerating machine oil is discharged from a compressor (1) at the time of heating operation, the degree of deterioration of the oil can be judged easily, and thus the degree of deterioration of the refrigerating machine oil can be judged with a simple structure, and the reliability of the refrigerator can be maintained for long period.