Refrigerator with automatic defrosting function and defrosting control method thereof

Abstract

The invention relates to a refrigerator with an automatic defrosting function and a defrosting control method thereof. The refrigerator comprises a compressor, a condenser, a dry filter, a three-way valve, a first capillary tube, a second capillary tube, a first evaporator, a second evaporator, a fan, a check valve, a gas-liquid separator, an electromagnetic valve, a relative humidity sensor and a controller. Under the condition of refrigeration, refrigerant is throttled through the first capillary tube and then is evaporated in the first evaporator, so as to generate cold; under the condition of frost collection, the refrigerant flows into the second evaporator through the second capillary tube, and air in the refrigerator is driven to perform forced convection by the fan through the second evaporator and is condensed into frost through phase change, so as to achieve the purpose of frost collection; under the condition of defrosting, the high-temperature refrigerant discharged by the compressor directly enters the second evaporator through the electromagnetic valve, so as to defrost; after the compressor is started, the frost condition operation is performed first, so as to capture water vapor in the refrigerator, then the refrigeration operation is performed, and whether the defrosting operation is performed is determined according to defrosting determination conditions. No frost exists on the inner wall surfaces of the refrigerator, automatic defrosting can be accurately performed in time, and the refrigeration effect can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of refrigeration appliances and refrigerators, and in particular relates to a refrigerator with an automatic defrosting function and a defrosting control method thereof. Background technique [0002] At present, the small commercial horizontal freezer has a frost freezer, and its evaporating coil is wound on the inner wall of the freezer. When the freezer is in cooling operation, it relies on natural convection to cool down the food and other loads inside. Due to frequent opening and closing of the door and when the door seal is not tightly sealed, the hot and humid water vapor in the environment will enter the compartment of the freezer, and the moisture in the food and other loads will also be emitted into the compartment of the freezer, so after a period of use, the inner wall of the freezer will form condensation. In the case of frost, when the frost is too thick, it will increase the thermal resistance ...

AI Technical Summary

Problems solved by technology

Due to frequent opening and closing of the door and when the door seal is not tightly sealed, the hot and humid water vapor in the environment will enter the compartment of the freezer, and the moisture in the food and other loads will also be emitted into the compartment of the freezer, so after a period of use, the inner wall of the freezer will form condensation. In the case of frost, when the frost is too thick, it will increase the thermal resistance between the evaporator coil and the air in the refrigerator, hindering the heat exchange on the surface of the evaporator, thereby reducing the cooling efficiency and affecting the cooling effect, and the running time of the compressor will also be corresponding Extend and increase power consumption, so the freezer should be defrosted in time

At present, the commonly used defrosting method for refrigerators is manual mechanical defrosting, such as ice shovel / cork shovel defrosting. This method needs to empty the food and other loads in the refrigerator, which is time-consuming and laborious. It may damage the inner container or refrigeration pipeline and is not easy to clean; at the same time The judgment of defrosting timing by manual defrosting method is very subjective, and there is no exact defrosting judgment condition; defrosting too late will cause the frost to be too thick, the defrosting time is long and it is not easy to remove; defrosting too early Can cause too frequent defrosting, reducing energy efficiency

Images