Patent ID: 9441638
Filing Date: 2016-09-13
CPC Classification: F04C,F05B,F25B,Y02P

Claim Text:
1. An oil-cooled gas compressor comprising: a compressor body; an oil separator separating out oil from compressed gas discharged from said compressor body; a gas pipe for sending, to a user, the compressed gas separated from the oil by said oil separator; and an oil pipe for returning, to said compressor, the oil separated by said oil separator, the oil-cooled gas compressor further comprising: an air-cooled heat exchanger for cooling the oil flowing through said oil pipe; a cooling fan with a controllable rotational frequency for sending cooling wind to said air-cooled heat exchanger; a waste-heat-recovery heat exchanger, being provided upstream of said air-cooled heat exchanger, in which the oil flowing is heat-exchanged with cooling fluid flowing for recovering heat from the oil flowing through said oil pipe; and a discharge temperature sensor detecting temperature of the compressed gas discharged from said compressor body, wherein the rotational frequency of said cooling fan is controlled in a manner such that temperature of the compressed gas discharged from said compressor body falls within a prescribed range in accordance with the temperature detected by said discharge temperature sensor, and wherein said air-cooled heat exchanger also cools compressed gas flowing through said gas pipe, and said waste-heat-recovery heat exchanger also recovers heat from the compressed gas flowing through said gas pipe.