A control method for improving the defrosting effect of air-cooled refrigerators under low ambient temperature conditions

Abstract

The invention discloses a control method for improving the defrosting effect of an air-cooled refrigerator under low ambient temperature conditions. The steps are as follows: the refrigerator is running, and the ambient temperature sensor detects that the ambient temperature and humidity Th is less than or equal to 18°C, triggering the defrosting control logic; initial heating The tube is energized normally, and the temperature of the defrosting sensor in the compartment rises. When the temperature rises to between 0 and 8°C, the heating tube is powered off, and it is left standing for 10 minutes. Record the temperature drop △t1. After 10 minutes, the heating tube continues to be energized When the temperature of the defrost sensor reaches 0 to 8°C again, the heating tube is turned off and left standing for 10 minutes, the temperature of the defrost sensor begins to drop. After 10 minutes, record the decrease △t2 again; and so on, and record n △tn generated when the heating is interrupted for the first time, when the drop rate △tn is less than 3°C, when the heating tube is between 0 and 8°C on the defrosting sensor, the power supply of the heating tube will not be interrupted, and the heating will continue until the temperature of the defrosting sensor reaches the defrosting temperature Stop the temperature, stop the power supply, and defrost is terminated.

Description

Technical field: [0001] The invention relates to a control method for improving the defrosting effect of an air-cooled refrigerator under low ambient temperature conditions, which belongs to the technical field of refrigerators. Background technique: [0002] The defrosting function of the current air-cooled refrigerator generally adopts the defrosting heating tube to generate heat to melt the ice layer on the surface of the evaporator to achieve the purpose of defrosting. The water produced by defrosting will use gravity to collect into the metal drip tray at the bottom of the evaporator, and finally drain out of the refrigerator. However, under the condition of low ambient temperature of the refrigerator, due to the low ambient temperature, generally accompanied by low humidity, the thickness of the frost layer on the surface of the evaporator is relatively thin. The time for the heating tube to be energized will be shorter than that under the condition of higher ambient ...

AI Technical Summary

Problems solved by technology

However, under the condition of low ambient temperature of the refrigerator, due to the low ambient temperature, generally accompanied by low humidity, the thickness of the frost layer on the surface of the evaporator is relatively thin. The time for the heating tube to be energized will be shorter than that under the condition of higher ambient temperature

In extreme cases, the temperature on the surface of the evaporator or the metal water tray does not reach above zero during the heating process of the heating tube, or the time to reach above zero is too short, resulting in incomplete defrosting on the surface of the evaporator or defrosting water Freezing re-freezes in the drip tray and builds up over time, eventually clogging the drain in the drip tray causing market complaints