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US 5,016,447 AGranted
Oil return for a two-stage compressor having interstage cooling
AssigneeCarrier Corporation
InventorsL. Thomas Lane, Bruce A. Fraser, Thomas E. Brendel
Life of this patent
Estimating the term…
Abstract
An internally compounded two-stage compressor has an interstage cooler and an oil separator associated therewith. The oil, and any hot gas mixed with it, discharged from the oil separator is passed in heat exchanger relationship with the cooling refrigerant flowing into the interstage cooler.
Claims4
A refrigeration system comprising:
- a compressor, a condenser, an expansion device and an evaporator serially interconnected to form a closed refrigeration circulation path, said compressor including;
- a low pressure stage having an inlet and outlet, and a high pressure stage having an inlet and an outlet, said compressor being lubricated with lubricating oil which mixes with the refrigerant being compressed therein, said outlet of said high pressure stage discharging compressed refrigerant mixed with lubricating oil;
- interstage cooling means for cooling the refrigerant flowing from said outlet of said low pressure stage to said inlet of said high pressure stage;
- means for receiving the mixture of compressed refrigerant and lubricating oil discharged from said outlet of said high pressure stage and for substantially separating the oil from said mixture;
- and
- means for conducting the separated oil to said interstage cooling means and for mixing the oil with the refrigerant flowing through said interstage cooling means.
3 more elements
Dependencies are inferred from the claim text.