In the chiller operating system, everyone is concerned about the refrigerant circulation system of the screw chiller and the chilled water circulation system of the unit. The lubrication system is often overlooked by everyone. In fact, this system of cold water is also very important for 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 system failure. If the piston ring structure is selected and the improper assembly and assembly of the cylinder can cause a lot of oil running phenomenon, and the abnormal leakage at the shaft seal will cause the oil level in the crankcase to drop significantly, which will lead to the suction of the oil pump; that is, in addition to the problem of the lubrication system itself. It should also be checked, analyzed and judged from the operating conditions of the screw chiller. There are no abnormal vibration, sound, heat and leakage. For the specific inspection, please refer to the following methods:
1, the system is seriously leaking.
2. The oil pump works for a long time, the wear of the pump is serious, and the internal leakage is too large, resulting in a significant reduction in the internal volume effect.
3. The oil temperature in the crankcase is too low, the viscosity of the frozen lubricating oil is too large, the filter inlet filter of the pump is too dense, the filter element is blocked, and the oil level is too low, and the oil pump is difficult to suck, causing suction.
4. The pressure regulating valve core is stuck in the open position or the spring of the pressure regulating valve is invalid.
The most common faults in the screw chiller lubrication system are: no pressure on the oil pump, pressure regulation failure and a sharp swing of the pressure gauge pointer. Pay attention to the following points in the maintenance of the chiller lubrication system:
1. Pay attention to observe 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 frozen lubricating oil, and replace or replenish the filtered new oil.
3. During the middle and overhaul, pay attention to check and adjust the end face clearance of the oil pump. If necessary, the pump should be replaced. The end face clearance of the pump is about 0.03-0.08mm depending on the size and size. For the specific values, please refer to the assembly technical requirements and factory regulations of the pump.
4. Regularly replace or clean the filter element, piping and crankcase.
The technical requirements for the maintenance of the screw chiller lubrication system are strong, mainly related to the performance of the compressor mainframe. It is recommended that the maintenance be carried out by professionals to avoid unnecessary losses.
