Defroster for air-cooled refrigerator and freezer and air-cooled refrigerator and freezer

Abstract

The invention discloses a defroster for an air-cooled refrigerator and an air-cooled freezer, the defroster is in a plate shape with a multi-layer structure, and the defroster comprises a substrate, a printed circuit layer located on the substrate and a first insulating layer arranged on the upper surface of the printed circuit layer. According to the defroster for the air-cooled refrigerator and the freezer, a plate-shaped structure of a printed pipeline is adopted, heating wires are not included, and the risk of explosion after refrigerant leakage does not exist; and magnesium oxide does not need to be filled, the specific heat capacity is low, the defroster quickly stops continuously dissipating heat into the refrigerator when being powered off, and the energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to an air-cooled refrigerator, a defroster for a freezer, an air-cooled refrigerator, and a freezer. Background technique [0002] Air-cooled refrigerators and freezers are refrigerated by the convection of cold air generated by the finned evaporator in the evaporator chamber. Although air-cooled refrigerators and freezers have the advantages of fast refrigeration speed and uniform temperature control, due to the low temperature of the evaporator, the water vapor in the air will form frost on the surface of the evaporator, which will reduce the heat transfer efficiency of the evaporator until the evaporator It is completely blocked and ineffective, so it must be defrosted periodically. The defrosting of air-cooled refrigerators or freezers is to install a defroster at the bottom of the evaporator. When the frost layer on the surface of the evaporator reaches a cer...

AI Technical Summary

Problems solved by technology

Due to the high radiation temperature, this structure will cause great thermal damage to the inner tank of the refrigerator; and due to the high temperature, it is very easy to cause explosion accidents when the refrigerant leaks, and is currently mainly used in small refrigerators

The second is the aluminum tube defroster, which is in direct contact with the fins on the finned evaporator, and heats the evaporator to defrost through heat conduction, and its heat conduction efficiency is high; It is easy to generate ice cubes, which will cause the drain hole of the refrigerator to be blocked, and the current dosage is not large

The mainstream structure is the stainless steel defroster, which, like the quartz tube defroster, is set at the bottom of the finned evaporator. Because it is directly connected to the end plate of the evaporator, it uses both radiant heat and conductive heat to improve the defrosting efficiency. Moderate, avoiding the shortcomings of the above two defrosters; but this kind of defroster has low production efficiency, high raw material cost and manufacturing cost, and its general process is: stainless steel tube cutting→heating wire cutting→filling MgO and other metal salts→drying and dehydration→drawing→sealing→forming→welding wires, etc.

Another disadvantage of the stainless steel defroster is that the specific heat capacity of the defroster is large. When the frost layer melts and the defroster stops heating, the defroster itself will continue to release a large amount of heat. At this time, the frost has been removed. The heat needs to consume electricity to be cooled by the cooling effect of the refrigerator or freezer, which greatly increases energy consumption.

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