Oil-cooled compressor
AssigneesHitachi, Ltd., Tokico Ltd.
InventorToshitsugu Suzuki
Life of this patent
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Abstract
An oil-cooled compressor including a main body driven by a motor for compressing gas and being cooled by oil, an oil tank for removing oil from the gas compressed in the main body and discharged therefrom, and a suction mechanism for supplying oil from the oil tank and gas into the main body. The suction mechanism includes a suction gas throttling mechanism, operable in response to the pressure of the compressed gas discharged from the main body. The motor is controlled by a temperature switch responsive to the temperature of the oil and a pressure switch which is responsive to the pressure of the compressed gas only at a pressure range which is lower than that of the compressed gas actuating the suction gas throttling mechanism.
Claims5
An oil-cooled compressor system comprising a compressor driven by a motor for compressing gas and being cooled by oil, an oil tank having an oil separator for removing oil from the gas which has been compressed in the compressor and discharged therefrom, oil in said oil tank being supplied to a suction side of said compressor, a means for throttling gas sucked into said compressor when the pressure of the gas discharging from said compressor exceeds a predetermined first pressure, a pressure switch acting at a second predetermined pressure of the gas at a different point in said system downstream of said compressor, said second pressure being lower than said first pressure, a temperature switch means which operates when the temperature of said oil in said oil tank exceeds a predetermined temperature, and a circuit connected to said pressure switch and said temperature switch means for controlling the operation of said motor so as to stop said motor when the pressure of the gas discharging from said compressor exceeds said second pressure and when the temperature of the oil exceeds said predetermined temperature.
Dependencies are inferred from the claim text.