Patent ID: 9328731
Filing Date: 2016-05-03
CPC Classification: F01C,F04C

Claim Text:
1. An oil free compressor system comprising: a low-pressure stage compressor boosting air to a predetermined intermediate pressure; a high-pressure stage compressor boosting compressed air, which was boosted to intermediate pressure, to a predetermined discharge pressure, the compressed air being boosted to the predetermined discharge pressure in a high-pressure chamber of the high-pressure stage compressor; a motor driving the low-pressure stage compressor and the high-pressure stage compressor; a low-pressure stage air-cooled heat exchanger cooling compressed air discharged from the low-pressure stage compressor; a high-pressure stage air-cooled heat exchanger cooling the compressed air discharged from the high-pressure stage compressor; a main body of the high-pressure stage compressor and the low-pressure stage compressor, the main body including a bearing part; a speed changer; a lubricating oil air-cooled heat exchanger cooling lubricating oil supplied to the bearing part of the main body of the high-pressure stage compressor and the low-pressure stage compressor, and the speed changer; a cooling fan positioned to provide a cooling wind through the low-pressure stage air-cooled heat exchanger, the high-pressure stage air-cooled heat exchanger, and the lubricating oil air-cooled heat exchanger; a duct arranged above the low-pressure stage compressor, the high-pressure stage compressor, and the motor in a package, the cooling fan being positioned in the duct and supplying cooling wind in a circumferential direction, and the package covering the motor, a low pressure stage air-cooled heat exchanger, a high-pressure stage air-cooled heat exchanger, a lubricating oil air-cooled heat exchanger, the cooling fan and the duct; wherein the low-pressure stage air-cooled heat exchanger, the high-pressure stage air-cooled heat exchanger are arranged in a circumferential direction, and the lubricating oil air-cooled heat exchanger is arranged at a top surface side of the cooling fan in the duct, the cooling fan is provided inside of the duct, upstream of and separated by a distance from each of the low-pressure stage air-cooled heat exchanger, the high-pressure stage air-cooled heat exchanger, and the lubricating oil air-cooled heat exchanger; and an exhaust duct is disposed downstream of each of the low-pressure stage air-cooled heat exchanger, the high-pressure stage air-cooled heat exchanger, and the lubricating oil air-cooled heat exchanger, each of the exhaust ducts connecting one of the heat exchangers to a top surface of the package.