Air-cooled refrigerator and energy-saving defrosting control method thereof

Abstract

The invention discloses an air-cooled refrigerator which comprises a refrigeration system, an electrical control device, a sensing device and an air duct system, wherein the sensing device comprises a refrigerating chamber temperature sensor, a freezing chamber temperature sensor and an evaporator temperature sensor; and a timing part arranged in the electrical control device comprises a compressor operation timer, a defrosting pre-preparation timer, an air return defrosting timer and an electrical-heated defrosting timer. The invention also provides an energy-saving defrosting control method of the air-cooled refrigerator. The energy-saving defrosting control method comprises the following steps of: entering a defrosting program; performing defrosting pre-preparation; performing air return defrosting; performing electrical-heated defrosting; and finishing defrosting. According to the air-cooled refrigerator and the air return defrosting control method thereof provided by the invention, signals of each sensor can be received by the electrical control device, the state of each timer can be monitored, fine control over a compressor, a fan and the like can be realized, over-high temperature of a refrigerating chamber, caused by air return defrosting, is prevented, a preservation effect of the refrigerator is reduced, and meanwhile, a closed-loop type poor working process is prevented.

Description

technical field [0001] The invention relates to an air-cooled refrigerator and an energy-saving defrosting control method thereof, in particular to a control method utilizing return air defrosting. Background technique [0002] Frost-free refrigerators, also known as intercooled refrigerators or air-cooled refrigerators, use fans to force convection circulation of cold air to indirectly refrigerate and freeze food. [0003] Structurally, the existing air-cooled refrigerator includes a refrigeration system, an electric control device, an air duct, a built-in fan in the air duct, a freezer room, a refrigerator room, a temperature sensor for the refrigerator room, and a temperature sensor for the freezer room. Compressor outlet, condenser, throttling device (capillary, throttle valve, etc.), evaporator, compressor inlet connected in sequence. The electronic control device receives the signal from the sensor, and controls the start and stop of the compressor, fan, etc. There a...

AI Technical Summary

Problems solved by technology

Frost-free refrigerators have their advantages: cooling is faster; but at the same time, they also have their fatal disadvantages: non-stop blowing air can easily cause the surface of food to dry out, and it needs to defrost the evaporator through an electric heater regularly, and the power consumption is relatively high

[0009] The above-mentioned refrigerators have the following defects: 1. When the gas in the refrigerator is used to defrost the evaporator, the cold air blown back into the refrigerator cannot meet the demand for cold air in the refrigerator, but there are no corresponding measures to prevent the refrigerator room from being too high; When the refrigerating room is larger than the freezing room, when the temperature of the freezing room meets the requirement, the temperature of the refrigerating room often does not meet the requirement.

This defect leads to a decrease in the freshness preservation effect of the refrigerator

The above-mentioned defects are more obvious in refrigerators with larger refrigerator compartments than freezer compartments

[0010] 2. This kind of refrigerator may have the following bad working process of dead cycle during work: the frost layer of the evaporator is too thick, so that the heat exchange efficiency is too low, resulting in the continuous operation of the refrigerator, but the temperature of the freezer cannot be lowered to the set value value, so the defrosting program cannot be started; because the defrosting program cannot be started, the frost layer of the evaporator will accumulate thicker and thicker, resulting in a further reduction in heat exchange efficiency, so that the temperature of the freezer can never reach the lower value required to trigger defrosting

However, there is no air-cooled refrigerator that can dynamically adjust the fan speed according to the changes of the above three factors, that is, the existing air-cooled refrigerator cannot fine-tune the operation of the refrigerator

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