Kobelco Compressors Corporation

Kobe Steel, Ltd.

Katsunori Hamada

Noboru Tsuboi

Hajime Nakamura

Shuto Yakubo

Kazuyuki Yoda

Koki Takeuchi

Akira Hoshikawa

Yosuke Fukushima

A compressor includes: a compressor body that suctions and compresses a gas to be compressed; heat exchangers that circulate a cooled target inside the heat exchangers to cool the cooled target; a fan that is driven by a fan motor and that sends a cooling gas to the heat exchangers to remove heat; a temperature sensor that detects an initial cooling gas temperature that is a temperature of the cooling gas not having been subject to heat removing for the heat exchangers; and a control unit that is capable of setting an upper limit frequency that is an upper limit for controlling a rotational frequency of the fan motor. The control unit sets the upper limit frequency to a rotational frequency equal to or lower than a frequency at which current at an acceptable current level is supplied to the fan motor, at each of the initial cooling gas temperatures detected by the temperature sensor.

Compressor, and control method for same

Provided is a compressor including: a compressor body that has a motor and compresses air; an aftercooler for cooling the compressed air supplied from the compressor body; a dryer for dehumidifying the compressed air flowing out from the aftercooler; a drain discharge valve for discharging a drain from the dryer; a first pressure sensor for measuring air pressure downstream of the aftercooler; and a control device having a rotation-speed adjusting unit that drives the motor at second acceleration smaller than first acceleration, the first acceleration being rated acceleration of the motor, when a pressure value measured by the first pressure sensor is less than a first threshold value predetermined at startup of the motor.

Compressor and method of operating same

A screw compressor is provided with: a compressor body in which a screw rotor is accommodated in a rotor casing; a motor in which a rotator and a stator are accommodated in a motor chamber, the motor for rotationally driving a rotor shaft through use of a motor shaft; axial liquid supplying parts, provided on an anti-rotor side of the motor shaft; a motor shaft cooling part which is a cavity extending in the axial direction inside the motor shaft, the motor shaft cooling part for cooling the motor shaft by circulating a cooling liquid through the inside of the cavity thereof; and a liquid outlet part positioned on a rotor side of the motor shaft or a motor side of the rotor shaft and fluidically connected to the motor shaft cooling part so as to extend radially inward from an outlet opening formed in an outer surface of the motor shaft or the rotor shaft.

Screw compressor

Growing community of inventors

Hyogo, Japan

Katsunori Hamada