초록 ▼

The invention relates to improvements in a refrigeration system having an oil cooled screw compressor from which mixed oil and compressed refrigerant issues to an oil separator via a discharge duct, and wherein a refrigerant pump draws liquid refrigerant from the high pressure receiver and delivers

The invention relates to improvements in a refrigeration system having an oil cooled screw compressor from which mixed oil and compressed refrigerant issues to an oil separator via a discharge duct, and wherein a refrigerant pump draws liquid refrigerant from the high pressure receiver and delivers it to the discharge duct to cool the oil and desuperheat the refrigerant. The refrigerant pump and a hydraulic motor that drives it are in a single sealed housing. The hydraulic motor is energized with pressure oil from the oil pump whereby oil is returned to the compressor from the oil separator. Oil flow to the hydraulic motor is throttled in accordance with output from a temperature sensor at the discharge duct, to maintain a constant temperature of oil-refrigerant mixture passing to the oil separator. A standpipe arrangement prevents cavitation at the refrigerant pump.

대표청구항 ▼

Refrigeration apparatus comprising a screw compressor which is cooled and lubricated by the circulation of oil therethrough and from which a mixture of compressed refrigerant and oil issues to an oil separator through a discharge duct, oil recirculating means comprising an oil pump having an inlet c

Refrigeration apparatus comprising a screw compressor which is cooled and lubricated by the circulation of oil therethrough and from which a mixture of compressed refrigerant and oil issues to an oil separator through a discharge duct, oil recirculating means comprising an oil pump having an inlet communicated with the oil separator and an outlet from which pressurized oil is conducted to the screw compressor, a receiver to which refrigerant flows from the oil separator through a condenser and in which liquid refrigerant is held for circulation through an evaporator, and delivery means comprising a refrigerant pump having a refrigerant inlet connected with said receiver and an outlet communicated with said discharge duct to deliver thereto a flow of liquid refrigerant that cools said mixture, said apparatus being characterized by: A. a hydraulic motor drivingly connected with said refrigerant pump and having an inlet for pressurized fluid and an outlet for exhaust fluid; B. oil duct means for delivering to said inlet of the hydraulic motor a portion of the pressurized oil issuing from the outlet of the oil pump, for energizing the hydraulic motor; C. other oil duct means communicating the exhaust outlet of the hydraulic motor with said discharge duct; and D. a housing which encloses both said refrigerant pump and said hydraulic motor.