Multiple evaporator refrigeration systems

Claim 1

A REFRIGERATION SYSTEM CONNECTED TO PROVIDE REFRIGERATION, SAID SYSTEM COMPRISING: (1) A REFRIGERANT COMPRESSOR FOR COMPRESSING REFRIGERANT VAPOR, SAID COMPRESSOR HAVING AN INLET PASSAGE AND A DISCHARGE PASSAGE, AND SAID COMPRESSOR BEING DRIVEN BY AN ELECTRIC MOTOR; (2) A CONDENSER FOR LIQUEFYING COMPRESSED REFRIGERANT VAPOR, SAID CONDENSER HAVING AN INLET CONNECTED TO SAID COMPRESSOR AND AN OUTLET FOR DISCHARGING LIQUEFIED REFRIGERANT; (3) A PLURALITY OF EVAPORATORS FOR VAPORIZING LIQUEFIED REFRIGERANT TO PRODUCE COOLING AT DESIRED LOCATIONS; (4) A PLURALITY OF VARIABLE ORIFICE EXPANSION VALVES, ONE OF EACH OF THE SAID EXPANSION VALVES BEING ASSOCIATED WITH AND DISPOSED AHEAD OF ONE OF EACH OF SAID EVAPORATORS FOR GOVERNING PASSAGE OF REFRIGERANT FROM THE OUTLET OF SAID CONDENSER TO SAID ASSOCIATED EVAPORATOR; (5) A HOT GAS BYPASS PASSAGE CONNECTING THE DISCHARGE OF SAID COMPRESSOR WITH THE INLET THEREOF, A HOT GAS BYPASS VALVE DISPOSED IN SAID HOT GAS BYPASS PASSAGE, SAID HOT GAS BYPASS VALVE BEING REPONSIVE TO A FUNCTION OF SUCTION PRESSURE AT THE INLET OF SAID COMPRESSOR AND ARRANGED TO BYPASS COMPRESSED HOT GAS DISCHARGED FROM SAID COMPRESSOR TO THE INLET OF SAID COMPRESSOR WHEN THE SUCTION PRESSURE DROPS BELOW A PREDETERMINED VALUE; AND (6) BYPASS PASSAGE MEANS FOR BYPASS REFRIGERANT FROM THE OUTLET OF SAID CONDENSER TO THE LOW PRESSURE SIDE OF THE SYSTEM TO SUPPLY A PREDETERMINED MINIMUM QUANTITY OF COLD REFRIGERANT TO SAID COMPRESSOR TO COOL SAID COMPRESSOR MOTOR WHEN SAID HOT GAS BYPASS VALVE IS OPEN.