Patent ID: 8221094

Claim:
A screw compressor unit comprising: a low pressure stage compressor body; a high pressure stage compressor body that further compresses a compressed air compressed by the low pressure stage compressor body; a plurality of rotor side gears, respectively, provided on rotor shafts of the low pressure stage compressor body and the high pressure stage compressor body; a motor comprising a motor body and a rotating shaft; a motor side gear provided on the rotating shaft of the motor; an intermediate shaft supported rotatably and provided with a first speed-increasing gear, which meshes with the motor side gear, and a second speed-increasing gear, which meshes with the plurality of rotor side gears, wherein the low pressure stage compressor body and the high pressure stage compressor body are placed in parallel overlying at least a portion of the motor body such that the rotating shaft of the motor and the rotor shafts of the low pressure stage compressor body and the high pressure stage compressor body extend from one side of the motor side gear and the plurality of rotor side gears, and the intermediate shaft is located between the rotating shaft of the motor and the rotor shafts of the low pressure stage compressor body and the high pressure stage compressor body; a gear casing that accommodates therein the motor side gear, the first speed-increasing gear, the intermediate shaft, the second speed-increasing gear, and the rotor side gears; a first cooling apparatus that cools a compressed air from the low pressure stage compressor body; and a second cooling apparatus that cools a compressed air from the high pressure stage compressor body, wherein the motor, the gear casing, the low pressure stage compressor body, and the high pressure stage compressor body are arranged centrally of the screw compressor unit, the first cooling apparatus is arranged on one side in a long width direction of the screw compressor unit, and the second cooling apparatus is arranged on the other side in the long width direction of the screw compressor unit.