Structure and principle of no frost evaporator of refrigeratorView: 20609/04/2021
no frost evaporator of refrigerator is usually installed inside the refrigerator. no frost evaporator of refrigerator refrigerant from the outside world (the air and food inside the box) to absorb heat for vaporization, so that the temperature inside the refrigerator drop, to achieve the effect of refrigeration.
1、No frost evaporator of refrigerator
At present, the refrigerator built-in no frost evaporator of refrigerator more for the plate and tube structure, this evaporator is the copper or aluminum tube made of a certain shape, with tin welding or bonding method installed in the formation of copper or aluminum plate composition.
The structure of plate and tube type no frost evaporator of refrigerator is simple, easy to process, no high requirements for raw materials and processing equipment; but this no frost evaporator of refrigerator can only be made into a one-way coil and the length of the coil is limited to a certain extent, because there will be a certain distance between the coil and the wall plate. The distance, which to a certain extent affects the heat transfer efficiency, but also will cause no frost evaporator of refrigerator cooling capacity is not uniform phenomenon.
Some of the old refrigerators used in the no frost evaporator of refrigerator more for the blowing type evaporator, it is relying on the air natural circulation of a no frost evaporator of refrigerator. this no frost evaporator of refrigerator is Will have the welding resistance characteristic of the coating pour to the pre-designed evaporation pipeline mold, then with the plate good pipeline for strong high pressure tie welding, make it become one, and finally by high pressure nitrogen gas filling, will pipeline blowing expansion, this kind of evaporator whole embedded in the freezer insulation layer, once encounter evaporator leakage failure, must abolish the whole, and then re-embed new evaporator instead.
2、Exposed type no frost evaporator of refrigerator
Because the refrigeration room needs more cooling capacity than the freezer, therefore, the exposed evaporator is mostly used in the freezer, as shown in the figure below, from the figure can be seen that this evaporator is mainly composed of steel wire and coils.
The following figure for the structure of the exposed evaporator schematic diagram, it is in the refrigeration coil on both sides of the uniform place welded steel wire, its structure and steel wire coil condenser similar, this no frost evaporator of refrigerator more for the large volume drawer refrigerator freezer room.
Second, no frost evaporator of refrigerator working principle
no frost evaporator of refrigerator and the role of the condenser is the opposite, evaporator is also known as the heat absorber, its inlet and capillary tube connection, after processing low temperature and low pressure refrigerant through the capillary tube into the no frost evaporator of refrigerator, no frost The no frost evaporator of refrigerator absorbs the heat inside the chamber to vaporize the internal refrigerant and lower the temperature inside the chamber to achieve the purpose of refrigeration. The schematic diagram of its working principle is shown below. The refrigerant first passes through the freezer evaporator and cools the freezer, and then flows into the refrigerator evaporator to cool the freezer.