To solve a problem that, when an oil-cooled screw compressor is started after being stopped for a long period of time at a cooling environment, starting torque is increased due to a viscosity increase in oil stored in an operation chamber, and a drive means having a larger capacity than normal operation is required.
This oil-cooled screw compressor 1 includes: a casing 5; a pair of rotors 3, 4 housed in the casing and having threaded tooth grooves; an electric motor rotatively driving the rotors; a control device 11 controlling the electric motor; an oil supply mechanism supplying the oil to the operation chamber surrounded by the rotors and the casing by meshing the tooth grooves of the pair of the rotors; and an oil separating mechanism separating the oil from compressed gas delivered from the operating chamber. Only in a short time immediately after starting, drive is performed at low speed not increasing torque and the oil is discharged. After that, the speed is increased to the normal operation speed. Alternatively, residual pressure is released after stopping and the rotors are subsequently rotated for a short time, thereby the oil accumulated in the operation chamber is discharged and a succeeding start is easily performed.
YAMAZAKI MASARU
YASUJIMA TOSHIYUKI
SENOO MASAHARU
TANAKA HIDEHARU
SUZUKI NOBUNAGA
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Yuji Toda