How to maintain the lubrication system of the chiller

How to maintain the lubrication system of the chiller

In the operation system of the chiller, more attention is paid to the refrigerant circulation system, the chilled water circulation system and the electrical control system of the refrigerator. The lubrication system is often overlooked. As everyone knows, this system is also very important to the chiller.

　　The failure of the lubrication part of the chiller is not a problem of the lubrication system itself, but it will eventually lead to the failure of the system. If the piston ring structure at the cylinder is selected, improper processing and assembly can cause a large amount of oil running, and abnormal leakage at the shaft seal will cause the oil level in the crankcase to drop significantly, which will lead to the phenomenon of suction of the oil pump; The assembly clearance of the front and rear main bearings is too small, the lubricating oil is too dirty, and the long-term use of lubricating oil will increase the friction and wear of the moving parts, or at the same time, the high and low pressure blow-by due to the serious cylinder wear will cause the crankcase to heat up and the oil As the temperature rises, the viscosity of the lubricating oil decreases, thereby forming a vicious circle of lubrication conditions and causing the failure of the lubricating system. Therefore, the failure analysis of the lubrication system should be comprehensive, that is, in addition to the problems of the lubrication system itself, the operating conditions of the refrigerator should also be checked, analyzed and judged, such as whether there is abnormal vibration, sound, heat, and leakage.

　　 The most common failures of the industrial water unit lubrication system are: the oil pump has no pressure, the pressure regulation fails and the pressure gauge pointer swings violently. The main reasons are:

　　 1. Serious system leakage.

　　2. The oil pump has been working for a long time, the pump is worn out, the internal leakage is too large, and the volume effect is obviously reduced.

　　3. The temperature of the oil in the crankcase is too low, the viscosity of the refrigerated lubricating oil is too high, the filter screen of the pump inlet oil filter is too dense, the filter element is blocked, and the oil level is too low, the oil pump is difficult to absorb oil, causing the phenomenon of suction.

　　4. The pressure regulating valve core is stuck in the open position or the spring of the pressure regulating valve fails.

　　 From the following aspects, it can be determined whether the chiller lubrication system is normal:

　　 1. The oil level in the crankcase should be sufficient and stable for a long time.

　　2. The temperature of the oil in the crankcase should be kept between 10-65℃, and the suitable working temperature for is 35-55℃.

　　3. The filter element of the oil filter should not be clogged, and the fine oil filter with differential pressure should have a clogging indicator.

　　4. The oil pressure gauge is specified to be stable. The indicated pressure should be 0.05-0.3MPA higher than the suction pressure for the piston or refrigerator, and 0.2-0.3MPa higher than the condensing pressure for the screw type refrigerator.

　　 The following points should be paid attention to in the maintenance of the chiller lubrication system:

　　 1. Pay attention to whether the oil level, oil temperature and oil pressure are normal during daily inspection.

　　2. Regularly check the oil quality according to the oil change index specified by the refrigerated lubricating oil, and replace or supplement the filtered new oil.

　　 3. Pay attention to check and adjust the end face clearance of the oil pump during medium and overhaul, and replace the pump if necessary. The end face clearance of the pump is about 0.03-0.08mm depending on the size and specifications. For specific values, please refer to the relevant pump assembly technical requirements and factory regulations.

　　4. Regularly replace or clean the filter element, pipeline and crankcase.

　　 The maintenance technical requirements of the chiller lubrication system are relatively strong, mainly related to the performance of the compressor host, it is recommended that the maintenance be performed by professionals to avoid unnecessary losses.