Control method for air-cooled refrigerator

Abstract

The invention provides a control method for an air-cooled refrigerator. The method comprises the following steps that S2, a compressor and a fan are operated simultaneously to refrigerate a refrigerating compartment, whether defrosting is started or not is judged, and if yes, the compressor is controlled to stop, and the fan is controlled to operate continuously to defrost an evaporator; S3, after defrosting is started, the temperature of the evaporator is sensed, after the temperature of the evaporator reaches the intermediate defrosting temperature, the temperature of the refrigerating compartment is sensed, if the temperature of the refrigerating compartment is higher than the shutdown temperature, the compressor is controlled to start to refrigerate the refrigerating compartment, and if the temperature of the refrigerating compartment reaches the shutdown temperature, the fan is controlled to continue operating to defrost the evaporator continuously; and S4, in the process that the fan continues operating to defrost the evaporator continuously, when the temperature of the evaporator increases from the intermediate defrosting temperature to the final defrosting temperature, the fan is controlled to stop, and defrosting is finished. Accordingly, the temperature in the refrigerating compartment is also taken into consideration in the defrosting process, the temperature in the refrigerating compartment fluctuates slightly, and the freshness retaining effect of the refrigerating compartment is improved.

Description

technical field [0001] The invention relates to the field of refrigeration, in particular to a control method for an air-cooled refrigerator capable of reducing temperature fluctuations in a refrigeration compartment during defrosting. Background technique [0002] Air-cooled refrigerators, also known as frost-free refrigerators, rely on forced convection between the evaporator and the refrigeration compartment to achieve cooling in the refrigeration compartment. During the cooling operation, the surface temperature of the evaporator is low, and when the water molecules evaporated from the food and the water molecules in the outside air flow through the evaporator through the air duct in the refrigeration room, they will often drop in temperature due to a sudden drop in temperature. Frosting on the surface of the evaporator greatly reduces the heat exchange rate between the evaporator and the air in the refrigerator, reducing the cooling efficiency. Therefore, general air-co...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned defrosting process, a defrosting heater needs to be pre-installed on the evaporator, which increases the manufacturing cost and the energy consumption of the refrigerator.

[0004] Chinese patent No. CN201992941U discloses an air-cooled refrigerator, comprising a refrigerating room, an evaporator, an air duct connecting the evaporator and the refrigerating room, a fan arranged in the air duct, and a device for detecting the temperature of the evaporator. A defrosting sensor and a controller, the controller controls the evaporator to stop cooling after the temperature of the refrigerating room reaches the set temperature of the refrigerating room, and controls the evaporator to stop cooling after the defrosting sensor detects that the temperature of the evaporator reaches a threshold , control the fan to close, although the defrosting heater is cancelled, but in the defrosting process, if the defrosting time is long, it will easily lead to excessive temperature fluctuations in the refrigerating compartment, which will affect the freshness preservation effect of the refrigerating compartment

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