| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration of lubrication performance by preventing a refrigeration machine oil from being diluted too much by dissolving of a refrigerant during an operation of an air conditioner.SOLUTION: An air conditioner which uses an inside low pressure type scroll compressor 11 includes: a heater 20 for heating the compressor 11; a shell bottom part temperature sensor 31 for detecting a temperature (compressor bottom temperature) of a sealed shell bottom part of the compressor 11; and an evaporation temperature sensor 32 (33) for detecting an evaporation temperature of a refrigerant. Control means 30 includes dilution data which becomes a propriety determination reference of a refrigerant dissolved amount with respect to a refrigeration machine oil in which the evaporation temperature of the refrigerant and the compressor bottom temperature are made to be a parameter. From the dilution data, a determination reference temperature TE of the compressor bottom temperature at the time of the refrigerant evaporation temperature detected by the evaporation temperature sensor 32 (33) is acquired, and an actual compressor bottom temperature TF is acquired from the shell bottom part temperature sensor 31, and when TF-TE≤0°C, electricity conduction to the heater 20 is turned on and the compressor 11 is heated, and when TF-TE>0°C, electricity conduction to the heater 20 is turned off.SELECTED DRAWING: Figure 1 |
