Patent ID: 8734126

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 including a motor body and a rotating shaft; a gear casing that accommodates therein a motor side 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 first and second cooling apparatuses, respectively, comprise: a duct provided in a substantially vertical direction; a cooling fan provided in the duct to generate a cooling wind; and a heat exchanger for compressed air, provided upstream of the cooling fan in the duct to exchange heat with the cooling wind to cool the compressed air from the low pressure stage compressor body or the high pressure stage compressor body, 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, wherein 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 gear casing, and wherein the motor, the gear casing, the low pressure stage compressor body, and the high pressure stage compressor body are arranged centrally of the compressor unit, the first cooling apparatus is arranged on one side in a long width direction of the compressor unit, and the second cooling apparatus is arranged on another side in the long width direction of the compressor unit.