1, fault reason analysis:floatboard with tight on both sides of the self-contained bearing set with fixed. To test the high temperature occurs free bearing, vibration value is on the high side of the fault, open bearing turns the bonnet and manual slow rotary fan, found in a particular position of the shaft bearing roller, in the load area also have the rolling conditions. So can determine running bearings changes on the high side and the installation clearance gap may be insufficient. By that measure, bearing is only 0.04 mm internal clearance, turn uranium eccentric of 0.08 mm; Due to the large span around bearing, to avoid torsion shaft or bearing the error of the installation Angle is difficult, therefore, large fan can be adjusted by each of the spherical roller bearing. But when bearing internal clearance is insufficient. Bearing internal rolling piece by sports dimensional limitation, the automatic each function affected, instead of vibration value will rise. Bearing clearance with tight internal with the degree of and decreases, can't form lubrication music film, when running bearings for temperature rise and fall between zero, if bearing operation heat generation is still more than the absence of quantity of heat, the bearing temperature is climbing rapidly, at this moment, if not instant downtime, bearing will caustic, bearing and shaft with inner of tight is this example running bearings the cause of the high temperature anomaly.

2, elimination method: processing, left the tight set, readjust the shaft and the inner with the degree, the replacement of bearing clearance after take 0.10 mm. To installed after the restart fan, bearing vibration value and operating temperature are back to normal.

 
Bearing inner clearance is too small or parts of design and manufacture accuracy not well, all is extension running bearings the cause of the higher temperature, for the convenience of fan equipment installation; Repair and maintenance. General on the design used more tight set pieces bearing inner cone hole with the bearing of the bearing, but also easy for installation program oversight on problems. Especially appropriate of the gap remains. Bearing internal gap is too small. Operation temperature rapid rise: bearing inner cone and the hole with set too loose bearing for matching with loose happens to face in a short period and the burning of the fault.



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