| 摘要 |
PROBLEM TO BE SOLVED: To reduce drain in which oil is mixed, and reduce the burden of an user and an environment load by arranging a cooler for sucked air on the way of a flow path led from an air suction port to an inlet of a compressor main body, and enlarging a flow path cross sectional area led from the cooler to the compressor main body larger than an air pass cross sectional area of the cooler. SOLUTION: A suction throttle valve 10 is arranged in a suction port of a compressor main body 1, and a cooler 12 is disposed in an upstream side flow path of a piston 11 in the inside. A bend 13 is disposed on the way of a flow path led from a cooler 12 to the piston 11, and a drain hole 14 is disposed on the way of a flow path led from the cooler 12 to the bend 13. An outlet of the compressor main body 1 is connected to an outside through a piping for bypassing an oil separator 5 and an after cooler 6. An oil piping continued from an oil outlet disposed on a lower part of the oil separator 5 is connected to an oil inlet of the compressor main body 1 bypassing an oil cooler 8. After air is mixed with oil, moisture in air is eliminated, and oil and the like are prevented from mixing with moisture so as to obtain dry air.
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