How to add air conditioning refrigerant? What are the functions and requirements of air conditioning refrigerating oil?

For people in this era, air conditioners are already a household appliance that every family can’t live without. Even a family has several air conditioners installed. As the time of use increases, air conditioners also need to be maintained and repaired, the most common The problem is to add refrigerant to the air conditioner. Now let me introduce how to add refrigerant to the air conditioner. What are the functions and requirements of air conditioning refrigerating oil?

How to add air-conditioning refrigerant

1. We must drain the air-conditioning refrigerant;

2. Vacuum treatment;

3. Connect the air conditioning refrigerant charging valve with the refrigerating machine oil using a hose;

4. Put the refrigerating machine oil on the electronic scale (or pointer scale) Up;

5. Open the filling valve;

6. The air conditioner must automatically pump oil until the oil volume meets the requirement;

7. Turn off the charge Injection valve;

8. Fill air conditioner with refrigerant

The function and use requirements of air conditioner refrigerating oil

1. Air conditioner refrigerating oil The role of

In our compressor, refrigerating oil mainly plays four roles: lubrication, sealing, cooling, and energy regulation.

(1) Lubrication, the refrigerating oil plays a lubricating role in the compressor operation to reduce the friction and wear of the compressor, thereby prolonging the service life of the compressor.

(2) Sealing, the refrigerating oil plays a sealing role in the compressor, so that the piston and the cylinder surface in the compressor can be sealed between the rotating bearings to prevent refrigerant leakage.

(3) Cooling, when the refrigerating oil is lubricated between the moving parts of the compressor, it can take away the heat generated in the working process, keep the moving parts at a lower temperature, thereby improving the compressor’s Efficiency and reliability of use.

(4) Energy adjustment. For refrigeration compressors with an energy adjustment mechanism, the oil pressure of the refrigerating oil can be used as the power of the energy adjustment mechanism.

2. Requirements for the use of air-conditioning refrigerating oil

Because of the different applications and refrigerants, refrigeration equipment has different choices of refrigerating oil. The requirements for refrigerating oil are as follows:

1. Freezing point

The temperature at which refrigerating oil is cooled to stop flowing under experimental conditions is called the freezing point. The freezing point of refrigerating oil used in refrigeration equipment should be as low as possible (such as R22 compressor, the refrigerating oil should be below -55℃), otherwise it will affect the flow of refrigerant and increase the flow resistance, which will result in poor heat transfer.

2. Viscosity

The viscosity of refrigerating oil is an important parameter in the oil characteristics, and different refrigerating oils should be selected correspondingly when using different refrigerants. If the viscosity of the refrigerating oil is too high, the mechanical friction power, friction heat and starting torque will increase. On the contrary, if the viscosity is too small, the required oil film cannot be formed between the moving parts, and the desired lubrication and cooling effect cannot be achieved.

3. Cloud point

The cloud point of the refrigerating oil refers to the temperature at which paraffin begins to precipitate in the refrigerating oil when the temperature drops to a certain value, and the lubricating oil becomes turbid . The cloud point of the refrigerating oil used in the refrigeration equipment should be lower than the evaporation temperature of the refrigerant, otherwise it will cause the throttle valve to be blocked or affect the heat transfer performance.

4. Others

Such as chemical stability and oxidation resistance, moisture and mechanical impurities, and insulation properties.

5. Flash point

We know that the flash point of refrigerating oil refers to the temperature at which the lubricating oil is heated to the point where its steam is in contact with the flame. The flash point of the refrigerating oil used in refrigeration equipment must be 15-30℃ higher than the exhaust temperature to avoid burning and coking of the lubricating oil.

The above is the editor to introduce to you the methods and steps of adding refrigerant to air conditioners, and also introduce to you the function and use requirements of air conditioner refrigeration oil. I believe that when you see In the future, there will definitely be some knowledge and understanding. Now that we know these methods, we can try it ourselves when we need it. It will definitely make our air conditioners look new.

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