Oil cooled compressor
AssigneesHitachi, Ltd., Tokico Ltd.
InventorsToshitsugu Suzuki, Masayuki Tuchida
Life of this patent
Estimating the term…
Abstract
An oil cooled compressor including a compressor member driven by a motor, an oil tank receiving oil therein and removing oil from the gas discharging out of the compressor member, an oil supplying device for supplying the oil in the oil tank into the compressor member, and a pressure responsive control device for controlling the operation of the compressor member. There are provided a first temperature detector detecting the temperature of the oil, a second temperature detector detecting the temperature of the gas, and a temperature responsive control device restricting the function of the pressure responsive control device in response to the temperatures detected by the first and second temperature detectors.
Claims10
An oil-cooled compressor, comprising:
- a compressor member, having a suction side and a discharge side, for compressing a gas to be compressed, said compressor member having means for drawing said gas to be compressed from a source into said suction side and discharging compressed gas from said discharge side;
- a motor for driving said compressor member;
- an oil tank having an oil separator for removing oil from the compressed gas discharged from said discharge side of said compressor member, coupled to said discharge side of said compressor member;
- means, responsive to the temperature of said oil, the temperature of said gas to be compressed and the pressure of said discharged gas, for turning the motor off only when the difference between the temperature of said oil and the temperature of said gas to be compressed exceeds a predetermined temperature difference and the pressure of the discharged gas exceeds a first predetermined pressure;
- and
- means, responsive to the pressure of said discharged gas, for throttling said discharged gas in a closed path communicating with said suction side of said compressor member when the pressure of said discharged gas is within a pressure range higher than said first predetermined pressure, whereby said discharged gas and said oil are heated by the operation of said compressor member.
An oil-cooled compressor, comprising:
- a compressor member, having a suction side and a discharge side, for compressing a gas to be compressed, said compressor member further having means for drawing said gas to be compressed from a source into said suction side and discharging compressed gas from said discharge side;
- a motor for driving said compressor member;
- an oil tank, coupled to said discharge side of said compressor member, having an oil separator for removing oil from compressed gas discharged from said compressor member;
- means, responsive to the temperature of said oil, the temperature of said gas to be compressed and the pressure of said discharged gas, for turning the motor off only when the pressure of said discharged gas exceeds a first predetermined pressure, and either the temperature of said gas to be compressed exceeds a first predetermined temperature or the temperature of the air to be compressed is lower than a second predetermined temperature;
- and
- means, responsive to the pressure of said discharged gas, for throttling said discharged gas in a closed path communicating with said suction side of said compressor member.
Dependencies are inferred from the claim text.