| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerant exhaust device that can suppress increase of combustible refrigerant concentration by vaporizing, in a short time, dissolved combustible refrigerant with respect to refrigeration oil that remains with a small amount inside a compressor after discharge of residual material and where combustible refrigerant is dissolved, and can ensure safety without an explosion risk of the compressor.SOLUTION: A vacuum pump 7 and a drive valve 4 are attached to a compressor 1 after discharge of residual material; pressure in the compressor 1 is decompressed; and after decompression for a prescribed time, the drive valve 4 is opened, ambient air is flowed into the compressor 1, and the pressure in the compressor 1 is restored to atmospheric pressure. By repeating the decompression and ambient air inflow, combustible refrigerant dissolved in refrigeration oil remaining with a small amount in the compressor 1 is vaporized in a short time to be exhausted. |
