The principle of the evaporator of the refrigerator to absorb the heat of the food is: the low-temperature and low-pressure refrigerant vapor after capillary throttling and depressurization will quickly boil and evaporate under isothermal and pressure conditions, and absorb the heat of the air (or food) around the evaporator, inside the evaporator The refrigerant is vaporized from liquid to dry saturated vapor, which reduces the temperature in the box and achieves the purpose of refrigeration. Refrigerator evaporators have different characteristics due to different forms.
(1) Aluminum alloy composite plate evaporator
It is formed by pressing two thin aluminum plates, which are inflated to form a pipe. It is mostly used in the freezer compartment of a direct-cooled household refrigerator.
(2) Tube-plate evaporator
It makes an aluminum alloy sheet into the outer shell of the shell, and coils an aluminum tube or a copper tube with a diameter of 8-12 mm on it. One side of the round tube is rolled flat and tightly attached to the outer surface of the shell to increase the contact area and improve the heat transfer efficiency. It is mostly used in the freezer of a direct cooling refrigerator.
(3) Smooth tube evaporator
Use aluminum pipes, copper pipes or stainless steel pipes with a diameter of 8-12mm to make the corresponding shapes as required and fix them. Used in household refrigerators and freezers.
(4) Single-sided fin type evaporator
A strip of aluminum fin is connected to one side of the light pipe, and then bent into shape, which is mostly used in the refrigerator compartment of household refrigerators.
(5) Finned coil evaporator
It is generally composed of heat transfer tubes, fins and end pulls. The material of the heat transfer tube is pure copper tube, and the material of the fin is pure aluminum foil. The fins are multi-layered, and each layer is kept at the same distance. The U-shaped copper pipe is inserted into the hole of the fin, and then the two adjacent pipe ports on the opening side are inserted into the joint elbow and welded to form a closed pipe. This type of evaporator relies on a small dedicated fan to blow air in a forced convection cooling method for exchange. It has the characteristics of high reliability, long life, small size and good heat exchange performance. Generally used in indirect refrigerators.
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