Refrigeration system with means for controlling oil return

Claim 1

IN A REFRIGERATION SYSTEM HAVING A COMPRESSOR WITH HIGH PRESSURE AND LOW PRESSURE SIDES AND A CRANKCASE, A HIGH PRESSURE LINE FOR CONVEYING GASES FROM THE HIGH PRESSURE SIDE TO A CONDENSER, A RECEIVER TO COLLECT LIQUEFIED REFRIGERANT IN OPERATIVE RELATION TO SAID CONDENSER, AN EVAPORATOR FOR VAPORIZING SAID LIQUID REFRIGERANT IN OPERATIVE RELATION TO SAID RECEIVER, AND A SUCTION LINE OPERATIVELY CONNECTED FROM SAID EVAPORATOR TO THE LOW PRESSURE SIDE OF SAID COMPRESSOR; THE IMPROVEMENT COMPRISING: A SUCTION LINE EVAPORATOR COMPOSED OF AN ENCLOSED INNER BARREL HAVING UPPER AND LOWER PORTIONS; SAID SUCTION LINE PASSING FROM SAID EVAPORATOR INTO THE UPPER PORTION OF SAID BARREL; SAID SUCTION LINE LEAVING THE UPPER PORTION OF SAID BARREL AND PASSING INTO THE SUCTION SIDE OF SAID COMPRESSOR; A LUBRICANT RETURN LINE PASSING FROM THE LOWER PORTION OF SAID BARREL TO THE CRANKCASE OF SAID COMPRESSOR; AN ENCLOSED JACKET HAVING UPPER AND LOWER PORTIONS SURROUNDING A SUBSTANTIAL PORTION OF THE EXTERIOR OF SAID BARREL; SAID HIGH PRESSURE LINE PASSING FROM THE HIGH PRESSURE SIDE OF SAID COMPRESSOR TO THE UPPER PORTION OF SAID JACKET; SAID HIGH PRESSURE LINE LEAVING THE LOWER PORTION OF SAID JACKET AND CONNECTED TO SAID CONDENSER; TEMPERATURE SENSING MEANS LOCATED ADJACENT THE LOWER PORTION OF SAID BARREL; THERMOSTATIC CONTROL MEANS OPERATIVELY CONNECTED TO SAID SENSING MEANS; AND A VALVE MEANS LOCATED IN SAID LUBRICANT LINE AND CONTROLLED BY SAID THERMOSTAT WHEREBY BY MEANS OF TEMPERATURE SENSING AN AUTOMATIC VALVE CONTROL, LIQUID REFRIGERANTS AND CRANKCASE LUBRICANTS MAY BE SEPARATED AND PASSED TO THEIR RESPECTIVE INLETS IN SAID COMPRESSOR.