Control method for improving defrosting effect of air-cooled refrigerator under low-loop temperature condition

Abstract

The invention discloses a control method for improving the defrosting effect of an air-cooled refrigerator under a low ambient temperature condition. The control method comprises the following steps that the refrigerator is operated, and a defrosting control logic is triggered when the ambient temperature and humidity Th is detected by an ambient temperature sensor to be less than or equal to 18 DEG C; a heating tube is normally energized primevally, the temperature of a defrosting sensor in a chamber rises, when the temperature rises to be between 0 DEG C and 8 DEG C, energizing of the heating tube is stopped, standing lasts for 10 minutes, and the temperature decreasing magnitude delta t1 is recorded; after 10 minutes, the heating tube continues to be energized for heating, when the temperature of the defrosting sensor reaches to be between 0 DEG C to 8 DEG C again, energizing of the heating tube is stopped, the standing lasts for 10 minutes again, the temperature of the defrosting sensor begins to drop, and the decreasing magnitude delta t2 is recorded again after 10 minutes; and by analogy, the delta tn generated after the n-time interrupt heating is recorded, energizing of theheating tube is no longer interrupted when the falling magnitude delta tn is less than 3 DEG C and the defrosting sensor reaches to be between 0 DEG C and 8 DEG C, the heating is continued until thedefrosting sensor temperature reaches the defrosting termination temperature, the energizing is stopped, and the defrosting 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