| 摘要 |
PROBLEM TO BE SOLVED: To provide a simply structured drain device completely eliminating water in compressed air discharged from a water circulation type compressor so as to be fed to the working side. SOLUTION: Compressed air processed so as to separate water in a receiver tank 6 connected to the compressor 9 with is passed through a dryer 37 and introduced into a second receiver tank 51 in a waterproof device 100 arranged in the downstream of the dryer 37 so as to be processed to separate water again. In this way, when a compressor system is operated normally, no water is contained in the compressed air fed to the working side. In case of an abnormal condition, a level of accumulated water 55 inside the second receiver tank 51 is increased and this increase is detected by means of a second level sensor 52, and then, water supply/discharge to the compressor 9 is controlled and repairs are made on an abnormal part.
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