| 摘要 |
PROBLEM TO BE SOLVED: To obtain substantially constant discharge pressure, save a space for a discharge tank or dispense with it in an oilless variable displacement compressor device, and inexpensively enable actuation of the compressor device with a specified amount or lower of gas and small power within a wide range amount of gas to be used. SOLUTION: An oilless variable displacement compressor 2 device has an oilless compressor 2 whose rotational speed is so controlled as to obtain constant discharge pressure. In such a compressor device, a blow-off valve 8 blowing discharge gas when the used gas amount is a specified value or lower is composed of a plurality of paralley arranged ON-OFF control valves. A blowing amount of each of the blow-off valves is less than the specified gas amount, while sum of the blowing amounts of the blow-off valves 8 exceeds the specified gas amount.
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