Freezer lubrication system is the main work of the normal signs are: 1) specified stable pressure gauge, indicating the piston or freezer should be higher than the suction pressure 0.05-0.3MPA, the screw-type freezer should be higher than the condensing pressure 0.2-0.3 MPa. 2) The crankcase oil temperature should be maintained at 10-65 ℃, the most appropriate operating temperature is 35-55 ℃. Freezer 3) The oil level in the crankcase should be sufficient and should be stable over the long term. 4) filter cartridge should not be blocked on the pressure differential with the fine oil filter should send a blockage instructions. The most common lubrication system failure are: no pressure pump, pressure regulator malfunction and pressure gauge pointer violent swing. The main reason is: 1) the crankcase oil temperature is too low, the viscosity of frozen lubricating oil is too large, the pump inlet filter screen is too dense, the filter is blocked, and the oil is too low, the pump oil absorption difficulties, resulting in suction phenomenon . 2) long-term work of the pump, pump serious wear and tear, excessive leakage, the volume effect was significantly reduced. 3) The pressure regulator spool is stuck in the open position or the pressure regulator spring failure. 4) serious system leakage. Faults in the lubrication section of the freezer are not part of the lubrication system itself, but can eventually lead to system failure. If the cylinder piston ring structure selection, improper processing and assembly can cause a large number of running oil phenomenon, as well as abnormal leakage at the seal will make the crankcase oil surface decreased significantly, which led to the pump suction phenomenon; Before and after the assembly of the main bearing clearance is too small, too dirty oil and long-term use of lubricant deterioration will increase the friction and wear moving parts, or at the same time due to severe wear and tear cylinder wear high and low pressure blow-by gas will result in crankcase fever, oil Higher temperature, lower viscosity of the lubricant, resulting in a vicious cycle of lubrication conditions and lubrication system failure. Therefore, the failure analysis of lubrication system should be comprehensive, that is, in addition to the lubrication system itself, the operation should also be from the freezer operating conditions to be checked, analyzed and judged, such as the presence of abnormal vibration, sound, heat and leakage, etc. . Lubricating system maintenance should pay attention to the following points: 1) according to the provisions of the oil change oil frozen lubricant regularly check the quality of oil, replace or supplement the filtered new oil. 2) Regular replacement or cleaning of filters, piping and crankcase. 3) Check the daily inspection of the oil surface, oil temperature, oil pressure is normal. 4) In, overhaul should pay attention to check and adjust the end face of the pump clearance, if necessary, should be replaced pump. Depending on the size of the gap specifications of the pump is about 0.03-0.08mm, the specific value, please refer to the pump assembly technical requirements and factory regulations.
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