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The reason why the temperature of INA bearings is too high for a long time

wallpapers Tech 2021-03-01
Use a grinder to grind the thrust bearing septum ring by 0.07~0.08mm to enlarge the thrust clearance, so that the thrust clearance of the INA bearing is expanded to 0.14~0.15mm. During operation, the INA bearing temperature is normal, which completely eliminates the long-term defects and guarantees the equipment. Safe and stable operation. The long-term temperature of the INA bearings of the Yunnan Fan Electric #1 Unit's induced draft fan is too high, reaching 80 ~ 90 ℃, resulting in a greatly shortened bearing service life, and repeated replacement of INA bearings has not solved the problem. During the C-level maintenance in 2008, it was found that the gap between the shaft and the end cover shaft seal was too small. The bearing temperature was normal during the test run in the cold state, and the shaft was thermally expanded during hot operation, causing friction with the end cover shaft seal. It is analyzed that this is the reason why the temperature of the INA bearing is too high for a long time. The end cover hole is turned by 0.5mm to increase the gap between the shaft and the end cover shaft seal by 0.25mm to avoid friction between the shaft and the end cover after thermal expansion during operation. After treatment, the problem of high INA bearing temperature has been fundamentally improved.The temperature of the bearing is normal in cold and hot operation, and there is no oil leakage in the bearing box, which ensures good operating conditions of the INA bearing and reduces the INA bearing. The frequency of replacement saves on maintenance costs. 
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Tag: Bearings   INA bearings   INA