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How to choose lubricating oil for refrigerator and how to replace refrigerator oil
Release time：
2022-06-13 09:45
The working nature of the refrigerator is relatively special, so there are corresponding requirements for the lubricating oil. Let's take a look at how to choose the lubricating oil and replace the refrigeration oil for the refrigerator.
1. How to choose lubricating oil for refrigerator
When selecting lubricating oil for a refrigerator, a comprehensive analysis and comparison should be made according to the type of the refrigerator, the type of refrigerant used and its evaporation temperature, and the specific working conditions of the refrigerator (such as speed, load, working environment, etc.) Determine the specific specifications or grades of the refrigerator lubricating oil.
For small and low-speed (average linear speed less than 2m/s) double-cylinder piston refrigerators, n15 or n22 refrigerating oil can be used, and for large and medium-sized high-speed (average speed greater than 3m/s) multi-cylinder piston refrigerators, n32 or n32 can be used. n46 refrigerating machine oil, for piston refrigerating machine with high exhaust temperature, heavy load and particularly bad service conditions, n68 refrigerating machine oil can be used; for screw refrigerating machine lubricated by oil injection, n32 or n46 refrigerating machine oil can be used; For dry type (non-oil injection lubrication) screw type refrigerators and centrifugal type refrigerators, because the lubricating oil may not be in contact with the refrigerant, the refrigeration oil of n32 or n46 can be selected according to the load of the gear box and the main bearing, and the viscosity can also be selected. Very equivalent to l-tsa32 or l-tsa46 gasoline engine oil.
2. How to change the refrigeration oil
1. The lubricating oil we fill in the chiller must pass quality certification, and oils of different brands cannot be mixed. Different types of refrigerants should correspond to different lubricating oils, and special attention should be paid to the incompatibility between synthetic oil and mineral oil .Before filling the chiller with oil, ensure that the system is clean and free of impurities such as welding slag.
2. Synthetic oil should be used in the chiller, and ensure that the oil is not exposed to the atmosphere for a long time. The system should be thoroughly vacuumed when it is turned on for the first time.
3. In order to ensure the normal operation of the unit, the system should be dehumidified. It is recommended to use dry nitrogen to pass into the system for drying, and then carry out vacuum treatment.
Note: When vacuuming the system, it should be considered that the water vapor will evaporate under low pressure. At this time, part of the dry nitrogen should be charged into the system. It is very important to replace the system with new oil, especially if the acid residue still remains after the motor is burned out. Inside the system, the system status can be checked by changing the oil. Check the acidity of the lubricating oil, and replace the lubricating oil again after the system is running for 72 hours until the acidity of the lubricating oil reaches the standard value.
00001. When filling the lubricating oil, the customer should ensure that the total amount of lubricating oil in the system reaches the required filling amount. If the customer's chiller system has been filled with enough lubricating oil, but part of the lubricating oil needs to be released for maintenance, Then when refilling the lubricating oil, just add the amount of oil released.
3. Some suggestions for replacing lubricating oil in refrigerators
1. Oil change cycle: If the chiller compressor has been running for 10,000 hours, check the lubricating oil once. If the compressor is running for the first time, it is recommended to replace the lubricating oil and clean the oil filter after running for 2,000 hours. Check whether the system is clean, If the chiller system is operating in good condition, change the lubricating oil every 20,000 hours or every 4 years.
2. Avoid solid residues and metal impurities passing through the oil filter, which may cause bearing damage, so it is recommended to install a differential pressure switch. When the differential pressure on both sides of the oil filter reaches the set value, the differential pressure switch will act to stop the system. Prevent the bearing from being seriously damaged by oil loss in this case.
When we actually operate the refrigerator, we not only need to pay attention to the operating parameters of the chiller, but also pay attention to the selection of the lubricating oil of the refrigerator and the content of the operating procedures.
Relevant information
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Most natural rubber products practitioners know that in the production process of rubber products, especially rubber hoses, mixing is a very critical part, which is directly related to the quality of the products when they leave the factory. However, in mixing, The role of a rubber additive can not be ignored, it directly affects the plasticity and adhesion strength of the rubber compound, that is stearic acid.
Jiangxi Suker New Materials Co., Ltd.
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No. 998, Changbei Avenue, Linkong Economic Zone, Nanchang City, Jiangxi Province
