The freezer still has a lot of tips on the choice of oil. The lubricants used according to different types of machines are not the same. Hcg Pregnancy,Beta Hcg Test,Hcg Levels,Hcg Hormone Weihai Kangzhou Biotechnology Engineering Co.,Ltd , https://www.weihaikangzhou.com
1. Select the lubricating oil according to the type of compression; there are three kinds of compressors for the freezer, piston type, screw type and centrifugal type. Piston and screw lubricants are in direct contact with the refrigerant, so the interaction between them should be considered when selecting the lubricant. Centrifugal lubricants are only used to lubricate the rotor bearings, so they can be used according to load and speed. The size is N32 or N46 turbine oil.
2. Select the lubricating oil according to the type of refrigerant, which is necessary to take into account the interaction between the lubricating oil and the refrigerant. For example, a refrigerant such as Freon can be dissolved in mineral oil, so the viscosity of the selected lubricating oil is one level higher than that of the insoluble refrigerant, ensuring that the lubricating oil is lubricated after being diluted. In addition, it should be noted that the small amount of lubricating oil mixed in the refrigerant will not affect the operation of the refrigeration system. Check whether the lubricating oil mixed in the refrigerant precipitates wax crystals and blocks the refrigeration system. This is the flocculation point of the refrigerating machine oil we often say. Quality indicators.
3. In addition to selecting the lubricating oil according to the type of refrigerant, lubricating oil can be selected according to the evaporation temperature of the refrigerant. Generally, the oil of the corresponding freezing point is selected according to the evaporation temperature of the refrigerant, and the freezing of ammonia is used as the refrigerant. The freezing point of the lubricating oil used should be lower than the evaporation temperature. With Freon as the refrigerant, the condensation point of the lubricating oil can be slightly higher than the evaporation temperature.
4, the working conditions of the freezer are different. The lubricating oil is different. Large and medium-sized multi-cylinder, high-speed (average line speed of piston is more than 3m/s), and the chiller with large load should use VG46 or VG68 with higher viscosity. Or VG100 freezer oil. VG68 or VG100 refrigerating machine oil for high-load refrigerators with an exhaust gas temperature of around 145 °C. Refrigerators with small, miniature or low speed (the average line speed of the piston is not higher than 2m/s) can be used with VG22 or VG32 refrigeration oil.
The choice of freezer oil is directly related to whether the freezer can operate normally and efficiently. Improper selection will make the freezer inoperable.
Refrigeration oil selection rules