Device for assisting in defrosting through electric heating by utilizing air outside refrigerating chamber and operating method of device

Abstract

The invention discloses a device for assisting in defrosting through electric heating by utilizing air outside a refrigerating chamber and an operating method of the device. A heat insulating box is arranged at the upper part of a cold storage chamber, a first electric air valve is arranged at an inlet of the heat insulating box, a second electric air valve is arranged at an outlet of the heat insulating box, the top of the heat insulating box is provided with two air passages extending out of the cold storage chamber, a third electric air valve and a fourth electric air valve are arranged in the two air passages, an evaporator is arranged inside the heat insulating box, an electric heater is arranged in the evaporator, an air circulating air passage is formed between the bottom of the evaporator and a bottom plate of the heat insulating box, an inlet of the evaporator is connected with a throttling device, an outlet of the evaporator is connected with an air suction port of a compressor, an inlet of a condenser is connected with an exhaust port of the compressor, and an outlet of the condenser is connected with the throttling device. In the process of defrosting through electric heating, the air outside the refrigerating chamber and opening and closing of the electric air valves are utilized for assisting in defrosting through electric heating, so that the time of defrosting through electric heating is reduced, the operating energy consumption of the whole system is reduced, and relative stable temperature in the storage during defrosting is ensured.

Description

technical field [0001] The invention belongs to the field of low temperature and cold storage, and more specifically relates to a device and its operating mode that use the outside air of the refrigerator to assist electric heating and defrosting. Frost. Background technique [0002] At present, the total capacity of cold storage in my country is increasing year by year, and the defrosting problem of cold storage has always been a hot topic in the field of low temperature and cold storage. In order to make agricultural and sideline foods have a better fresh-keeping effect, it is necessary to provide a "low temperature and high humidity" environment in the refrigerator. When the circulating air is cold, it is easy to form frost on the surface of the evaporator. The frost layer will continue to accumulate and thicken over time, which will seriously affect the heat transfer effect of the evaporator. At the same time, the flow resistance of the circulating air of the evaporator...

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Problems solved by technology

[0003] As one of the defrosting methods of the refrigerator, the electric heating defrosting method is characterized by a simple structure, easy installation and control, but its disadvantage is that it consumes a lot of energy during the defrosting process

In addition, in the process of electric heating, a small part of the heat released by the electric heater is used for the defrosting of the evaporator, and most of the heat is dissipated into the refrigerator, which increases the cooling load of the refrigerator and affects the temperature fluctuation in the refrigerator. bigger

When the electric heating defrost is started, the temperature of the air around the evaporator will increase, and the refrigeration system will eliminate this part of the cooling load after defrosting, resulting in a great waste of energy

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