The function and working principle of oil separator

The function and working principle of oil separator The role of the oil separator in the chiller; In the vapor compression refrigeration system, the compressed ammonia vapor (or freon vapor) is in a high-pressure and high-temperature superheated state. Because of its fast flow rate and high temperature when it is discharged. Part of the lubricating oil on the cylinder wall is inevitably discharged into oil vapor and oil droplet particles together with refrigerant vapor due to high temperature. And the higher the exhaust temperature and the faster the flow rate, the more lubricating oil is discharged. Filter oil separator Filter oil separator is used in Freon refrigeration system, often called Freon oil separator. The oil separator is located between the refrigeration compressor and the condenser in the air-cooled chiller. It is mainly used to separate the lubricating oil entrained in the superheated vapor discharged from the compressor before entering the condenser, because of the transmission of the condenser. If there is an oil film on the hot surface, it will increase the heat transfer resistance, reduce the heat exchange capacity of the entire chiller and reduce the cooling capacity. 　　 Let's take a piston refrigeration compressor as an example. When a piston compressor is compressing refrigerant gas, oil is required for lubrication on the inner wall of the cylinder, crankshaft journal, piston pin and other places. Therefore, during the compression process, part of the lubricating oil in the compressor cylinder is affected by high temperature. It also vaporizes and is discharged in the refrigerant gas, which will inevitably cause the compressor to lose lubricating oil. 　　 Another point is that lubricating oil enters the condenser and evaporator. In the air-cooled chiller refrigeration system, the saturated evaporation temperature under a given evaporation pressure will increase, reducing the cooling capacity. Therefore, the lubricating oil in the refrigerant gas should try to drain back to the compressor after compression, and the oil separator plays this role. 　　 There are many types of oil separators. For our Freon chillers, filter-type oil separators are generally used. Its basic working principle is as follows: 　　 1. The gravity of the oil is different from that of the refrigerant gas, and the sedimentation separation is performed; 　　 2. Use the enlarged channel section to reduce the gas flow rate (generally about 0.8-1m/s), resulting in easy separation of light and heavy materials; 　　 　　 3. Force the gas flow direction to change, so that the heavy oil is separated from the light gas; 　　 4. The principle of using gas flow to strike the wall of the impeller: due to different viscosities and different masses, the reverse velocities are also different, which promotes the settlement and separation of oil.