Fault analysis: round leaves with two side adapter sleeve and the bearing seat bearing fit, re commissioning on the occurrence of free end bearing vibration value of high temperature, high fault. Disassemble the bearing seat cover, manual slow rotating fan, found in the bearing roller shaft in a particular location, in the non load area also has rolling, so can determine the bearing running clearance change is too high and the mounting clearance may be insufficient. The measurements show that, bearing internal clearance is only: 0.04MM, shaft eccentricity as 0.08MM, because of the left and right bearing span, to avoid the error of shaft deflection or bearing installation angle is difficult, therefore, large wind machine adopts automatic on heart function affected, vibration value will increase. Bearing internal clearance decreases with the increasing tightness of fit, can not form a lubricating film song, when the bearing running clearance because of temperature rise and drop to zero, if the generated bearing running more calories than the emission of heat, the temperature of the bearing is climbing fast, at this time, if not promptly stopped, the burning of bearing, the inner ring of the bearing in the bearing is bearing the tight match reason in this case abnormal high temperature operation.
Troubleshooting: processing, retreat under tight sets, with the re adjustment of the bearing on the inner tension, replace the bearing clearance after 0.10MM. Re installed, restart the fan, bearing vibration value and operation temperature returned to normal.