Defrosting device for refrigerator

Abstract

The defroster for refrigerator includes cold air path for circulating cold air inside the case, evaporator set on the cold air path to constitute freezing circulation, water storage tank over the evaporator to store normal temperature water, valve connected between the water storage tank and the evaporator to supply water to the evaporator selectively, and the water collecting tank below the evaporator to collect thawed water from the evaporator. In addition, between the water collecting tank and the water storage tank, there may be circulating pipeline with circulating pump to pump water from the water collecting tank to the water storage tank. Utilizing water in normal temperature to eliminate frost attached to the evaporator can avoid temperature rise during defrosting and raise freezing efficiency.

Description

technical field [0001] The invention relates to a refrigerator, in particular to a refrigerator defrosting device which utilizes water at normal temperature to remove frost generated by an evaporator. Background technique [0002] A general refrigerator is a device that repeatedly performs a refrigeration cycle of compression-condensation-expansion-evaporation of the medium to lower the temperature inside the box and maintain the freshness of food for a certain period of time. A refrigerator is one of the necessities in life. [0003] In a refrigerator, a compressor, a condenser, an expansion valve, and an evaporator form a refrigeration cycle as basic constituent parts. The compressor raises the temperature and pressure of the low-temperature and low-pressure gas medium into a high-temperature and high-pressure gas medium; the condenser condenses the medium flowing in from the compressor; the diameter of the expansion valve is narrower than that of other parts, and decompr...

AI Technical Summary

Problems solved by technology

[0011] But the defrosting heater of the prior art with above-mentioned structure has following shortcoming: when running defrosting process, the heat that produces by defrosting heater 6,7 makes casing internal temperature rise, so increases the weight to the next refrigerating cycle. The initial refrigeration load, due to the increased load on the evaporator 5, eventually led to a decrease in cooling efficiency

Moreover, the defrosting heaters 6 and 7 generate heat by applying electric current, and if excessive electric current is applied, the required temperature will be exceeded, resulting in a decrease in product safety.

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