JPS6438577A - Refrigerator - Google Patents

Abstract

PURPOSE: To achieve the shortening of pull down time while avoiding liquid packing by setting a travel fixing time of an expansion valve the larger, the larger the difference or the ratio is between the temperature of outside air and a set temperature in the storage while a travel adjustment of the expansion valve is shifted to the control of the degree of superheat based on a temperature difference between an inlet and an outlet of an evaporator after the fixing time passes. CONSTITUTION: The travel is adjusted by a valve drive part 40M based on a temperature difference between an inlet and an outlet of an evaporator 5 by detecting it to obtain the optimum degree of superheat. At the restarting of the operation after the completion of defrosting, the drive part 20M is driven to switch a hot gas valve 7 so that a high pressure gas pipe 11 communicates with the side of a condenser 2. Subsequently, the temperature of the outside air is detected by an outside air temperature detector 60 to determine a travel fixing time T of an expansion valve 4 based on the detected temperature TO of the outside air and a set temperature SP in the storage predetermined by a temperature setting 55. When the outside air temperature is so high to restrict a refrigerating capacity, which hinders the evaporator 5 from reaching a low temperature state smoothly to match the set temperature SP in the storage, the travel fixing time T is set longer to allow selecting of the optimum travel fixing time corresponding to a load.