Patent ID: 8870555

Claim:
Screw compressor comprising a housing, at least one screw rotor arranged in a compressor housing of the housing, a lubricant sump arranged on the high pressure side, lubricant collecting in said sump, and a lubricant supply device supplying lubricant from the lubricant sump to the at least one screw rotor, the lubricant supply device comprising a first lubricant supply system and a second lubricant supply system, a supply opening of the second lubricant supply system being located closer to the suction side of the at least one screw rotor than a supply opening of the first lubricant supply system, the first lubricant supply system supplies lubricant to the at least one screw rotor during operation of the screw compressor and the second lubricant supply system additionally supplies lubricant to the at least one screw rotor and is thereby activatable and deactivatable; wherein the screw compressor is operable in a normal load operation and in a high load operation and the second lubricant supply system is deactivated during normal load operation and is activated during high load operation; and wherein a compressor control is provided, said control detecting whether normal load operation or high load operation is present.