Defrostable refrigeration system

Claim 1

IN A REFRIGERATION SYSTEM OF THE TYPE HAVING ELEMENTS INCLUDING A COMPRESSOR, A CONDENSER, A RESTRICTOR, AN EVAPORATOR, AND CONDUIT MEANS CONNECTING SAID ELEMENTS IN SERIES FLOW CIRCUIT, MEANS INCLUDING A VALVE CONTROLLED LINE BY-PASSING SAID RESTRICTOR AND CONDENSER AND COMMUNICATING WITH SAID EVAPORATOR AND BEING OPERABLE TO INTERRUPT NORMAL FLOW OF LIQUID REFRIGERANT TO THE RESTRICTOR AND THENCE TO THE EVAPORATOR TO ESTABLISH MODIFIED FLOW OF HOT GASEOUS REFRIGERANT THROUGH SAID LINE AND TO SAID EVAPORATOR, MEANS PROVIDING HIGH HEAT EXCHANGE RELATION, UNDER SUCH MODIFIED CONDITIONS, BETWEEN REFRIGERANT FLOWING THROUGH THE RESTRICTOR AND REFRIGERANT FLOWING THROUGH THE CONNECTION BETWEEN THE EVAPORATOR AND THE COMPRESSOR, AND SUMP MEANS DISPOSED IN THE CIRCUIT BETWEEN SAID RESTRICTOR AND THE INLET TO SAID EVAPORATOR, SAID SUMP MEANS COMPRISING A PAIR OF VERTICALLY EXTENDING CONDUIT PORTIONS DISPOSED IN FLUID FLOW COMMUNICATION WITH ONE ANOTHER AT THEIR LOWER ENDS, ONE OF SAID CONDUIT PORTIONS BEING SUBSTANTIALLY LARGER IN CROSS SECTIONAL AREA THAN THE OTHER OF SAID CONDUIT PORTIONS, SAID RESTRICTOR BEING CONNECTED AT ITS OUTLET TO THE SAID CONDUIT PORTION HAVING THE LARGER AREA, AND SAID BY-PASS CONDUIT BEING CONNECTED AT ITS OUTLET AT A LOCATION INTERMEDIATE SAID EVAPORATOR AND SAID SUMP MEANS CONDUIT PORTION OF LESSER CROSS SECTIONAL AREA, THE LAST RECITED CONNECTIONS OF SAID RESTRICTOR AND SAID BYPASS CONDUIT BEING DISPOSED AT A LEVEL ABOVE THAT OF THE RECITED LOWER ENDS OF THE CONDUIT PORTIONS THAT ARE IN FLUID FLOW COMMUNICATION, HOT GASEOUS REFRIGERANT FLOWING THROUGH SAID CONDENSER AND SAID RESTRICTOR DURING DEFROSTING BEING CAUSED TO BE LIQUIFIED IN SAID RESTRICTOR IN THE REGION OF THE HEAT EXCHANGE MEANS AND TO FLOW INTO SAID SUMP MEANS FOR STORAGE THEREIN DURING SUCH DEFROSTING.