| 摘要 |
<P>PROBLEM TO BE SOLVED: To suitably return refrigerating machine oil to both of a low-temperature side compressor and a high-temperature side compressor, in a refrigerating device which: has the low-temperature side compressor for sucking in and compressing a refrigerant evaporated in a low-temperature side refrigerant evaporator and the high-temperature side compressor for sucking in and compressing a refrigerant evaporated in a high-temperature side refrigerant evaporator where the evaporation temperature is higher than that of the low-temperature side refrigerant evaporator; and is composed to merge the refrigerants discharged from the both compressors. <P>SOLUTION: The invention adopts an oil-returning composition in which refrigerating machine oil separated by oil separators (11a, 11C) is returned to intake sides of the low-temperature side compressor (21a) and the high-temperature side compressor (21c). In addition, a low-temperature side oil returning pipe (15) of an oil returning pipe (12) is provided with a pressure reducing mechanism (19) for adjusting intake pressure difference which performs pressure reduction according to pressure difference between pressure of the refrigerant flowing in a low-temperature side suction pipe (40a) and pressure of the refrigerant flowing in a high-temperature side suction pipe (40c). <P>COPYRIGHT: (C)2012,JPO&INPIT |
