The oil circuit system is an important part of the compressor circulation system. During normal operation, the oil circuit system will generate friction due to the rotation of the machine, and the heat generated by the friction will increase the temperature of the lubricating oil. At the same time, the oil temperature of the compressor oil circuit system will also increase. In order to ensure that the temperature of the lubricating oil can be reduced, water cooling and air cooling are generally used to cool the oil circuit system. In winter, because the outdoor temperature is low and the temperature of the circulating water is not high, the cooling effect of the oil system is much better. However, it does not mean that there will be no problems with the lubricating oil system. Some compressors in similar outdoor cold sheds have no major problems in resisting low temperatures because they are in the oil circuit circulation state. However, for standby equipment or equipment that has not been started for many years, if it is started again in a cold shed close to the outdoor temperature, the oil circuit may condense the lubricating oil due to the low temperature, so there will be problems when starting. This requires checking the oil circuit system to see if the lubricating oil in the oil circuit is in normal condition.
Cold weather will affect the service life of the lubricating oil, so it is recommended that users shorten its replacement cycle appropriately. It should be noted that the same brand of lubricating oil cannot be used in winter and summer. Because general lubricating oil has a characteristic: the viscosity decreases at high temperature, and the viscosity increases at low temperature. Therefore, the compressor should choose appropriate lubricating oil according to different seasons (mainly summer and winter), that is, according to different temperatures. The larger the number of lubricating oil in my country, the greater the viscosity. Therefore, if conditions permit, the lubricating oil used in winter and summer should be different. In general piston compressors, the cylinder-filler part uses No. 19 compressor oil in summer and No. 18 compressor oil in winter. The crankshaft-connecting rod part can use No. 50 mechanical oil in summer. No. 30 and No. 40 mechanical oil can be used in winter, so that the compressor can be better lubricated. Generally, single-acting small compressors use No. 13 compressor oil in winter and No. 19 compressor oil in summer.
The biggest feature of winter is the cold weather. When changing the lubricating oil, in order to ensure the effect, the compressor must be started and run for one hour first. The purpose of this is to restore the lubricating oil to normal temperature and do a simple and comprehensive cleaning of the entire compressor system (especially the lubricating oil system). After adding new lubricating oil again, it can be found that its service life will be significantly extended, and the performance of the entire system will also be significantly improved.
Lubricating oil should be stored in a heated room. If it is stored outdoors, the lubricating oil may freeze due to the low temperature and cannot be used immediately when needed. Lubricating oil should be stored separately from other materials because lubricating oil is flammable and may be disturbed by other items and cause malfunctions if it is stacked with other items.