Defrost method and means for refrigerated cabinets

Claim 1

IN A REFRIGERATION SYSTEM HAVING AN EVAPORATOR, A COMPRESSOR, A CONDENSER AND A RECEIVER WHEREIN REFRIGERANT LIQUID IS CIRCULATED FROM THE RECEIVER TO THE EVAPORATOR AND WHEREIN THE REFRIGERANT VAPORS ARE CIRCULATED FROM THE EVAPORATOR TO THE COMPRESSOR FOR RECOMPRESSION AND FROM THE COMPRESSOR TO THE CONDENSER WHERE THE COMPRESSED VAPORS ARE CONDENSED FOR RETURN TO THE RECEIVER, A DEFROST SYSTEM COMPRISING A PASSAGE COMMUNICATING THE DISCHARGE FROM THE COMPRESSOR WITH THE EVAPORATOR FOR CIRCULATION OF THE HOT VAPORS EXHAUSTED FROM THE COMPRESSOR TO THE EVAPORATOR, AN AUXILIARY SUPPLY OF REFRIGERANT LIQUID IN COMMUNICATION WITH THE PASSAGE WHEREBY REFRIGERENT LIQUID IS DRAWN FROM THE AUXILIARY SUPPLY INTO SAID PASSAGE RESPONSIVE TO THE CIRCULATION OF THE HOT VAPORS EXHAUSTED FROM THE COMPRESSOR THROUGH THE PASSAGE TO THE EVAPORATOR, AND HEATING MEANS IN HEAT EXCHANGE RELATIONSHIP WITH THE AUXILIARY LIQUID ADVANCED TO THE PASSAGE TO CONVERT SAID REFRIGERANT LIQUID TO THE VAPOR STATE AND FOR HEATING SAME WHEREBY THE TOTAL VOLUME OF HOT VAPORS ADVANCED TO THE EVAPORATOR FOR DEFROST COMPRISES THE HOT VAPORS EXHAUSTED FROM THE COMPRESSOR PLUS THE LARGE VOLUME FROM THE SO CONVERTED AUXILIARY REFRIGERANT LIQUID TO CAUSE RAPID DEFROST OF THE EVAPORATOR.