Ice making refrigeration apparatus

Claim 1

IN ICE MAKING APPARATUS, A REFRIGERATION SYSTEM ADAPTED TO BE CYCLED ALTERNATELY THROUGH A FREEZING CYCLE AND A HARVESTING CYCLE, INCLUDING AN ENCLOSED EVAPORATOR CHAMBER ADAPTED TO BE FULL OF LIQUID REFRIGERANT AT THE COMMENCEMENT OF THE FREEZING CYCLE HAVING TWO HEAT CONDUCTING, GENERALLY VERTICALLY DISPOSED SIDE WALLS DEFINING EXTERIOR ICE-FORMING SURFACES OF LARGE AREA, WATER SPRAY MEANS FOR DIRECTING WATER ONTO SAID ICE-FORMING SURFACES ADJACENT THE TOP THEREOF DURING SAID FREEZING CYCLE, SAID EVAPORATOR CHAMBER HAVING A LIQUID REFRIGERANT INLET CONNECTION AND A SUCTION OUTLET CONNECTION, MEANS FOR CONTINUOUSLY APPLYING SUCTION CONDITIONS TO SAID OUTLET CONNECTION OF SAID EVAPORATOR CHAMBER THROUGHOUT BOTH SAID FREEZING AND HARVESTING CYCLES, AND VALVE MEANS FOR PLACING SAID EVAPORATOR CHAMBER IN CLOSED INLET CONDITION DURING SAID FREEZING CYCLE TO TERMINATE ALL SUPPLY OF LIQUID REFRIGERANT THRETO, SAID VALVE MEANS CLOSING SAID INLET CONNECTION DURING SAID FREEZING CYCLE TO ESTABLISH REDUCING PRESSURE CONDITIONS DURING THE FREEZING CYCLES RESPONSIVE TO THE SUCTION CONDITIONS CONTINUOUSLY APPLIED TO SAID OUTLET CONNECTION CAUSING EVAPORATION OF LIQUID REFRIGERANT THEREIN IN THERMAL EXCHANGE WITH WATER ON SAID ICE-FORMING