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In the steam compression refrigeration cycle freon system, the mixture of freon and lubricating oil can dissolve copper. The dissolved copper ions return to the compressor with the refrigerant circulation and contact with the steel or cast iron, and then precipitate and deposit on the surface of these steel components, forming a layer of copper coating. This is the so-called "copper plating phenomenon".
This phenomenon is aggravated with the increase of moisture content and temperature in the system, especially in the bearing surface, suction and exhaust valves, cylinder walls, piston rings and other smooth and often friction surface is more obvious.
1, reciprocating compressor: "copper plating" will destroy the sealing of the shaft seal, affect the valve gap flow channel, affect the cylinder and piston with the clearance, is very bad for the operation of the refrigerator.
2. For rotary compressor: "copper plating" occurs between the meshing rotors, which can cause the rotor to lock.
3. Copper parts in the system: "copper plating phenomenon" leads to corrosion of copper parts (such as connecting rod small copper bearings, shaft seals, etc.), resulting in increased clearance and poor sealing of the parts.
4. For other steel parts in the system: "copper plating phenomenon" makes the diameter of steel capillary parts thinner, increases the flow resistance of oil or refrigerant, and affects the normal operation of the unit.
How to prevent copper plating in refrigeration compressor?
To prevent the occurrence of copper plating in refrigeration compressor, you can do so:
Use compressor refrigerant oil with good thermochemical stability with freon refrigerant.
When filling the compressor with chilled oil, install a filter dryer on the oil filling line to filter out the moisture in the chilled oil.
When adding refrigerant to the compressor, install a filter dryer on the fluorinated pipe line to filter out the moisture in the refrigerant.
When filling the refrigerant, exhaust the air in the fluoride pipe to ensure that the refrigerant added does not contain air, because the air contains water.
When replacing cooling accessories, remove the vacuum to clean the air
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