【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20210218

D Analysis: Reasons for high bearing temperature in the pump 1. A bent or misaligned pump shaft can cause the water pump to vibrate, leading to overheating or wear of the bearings. 2. Due to an increase in axial thrust (for example, when the balance disc and balance ring in a water pump become severely worn), the axial load borne by the bearing increases, resulting in overheating or even damage to the bearing. 3. Insufficient or excessive amount of lubricating oil (grease) in the bearing, poor quality of the lubricant, and the presence of debris such as sediment and iron shavings inside: Sliding bearings may fail to rotate due to faulty oil, which prevents oil from reaching the bearings and leads to overheating. 4. The fit clearance of the bearing does not meet the requirements; for instance, if the fit between the bearing inner ring and the water pump shaft, or between the bearing outer ring and the housing is either too loose or too tight, it can cause the bearing to overheat. 5. The static balance of the pump rotor is poor. The radial force on the pump rotor increases, leading to higher bearing loads and subsequent heating of the bearings. 6. Vibration occurs when the pump operates at off-design conditions, which can also cause the pump bearings to heat up. 7. The bearing is damaged; this is often a common cause of bearing overheating. Examples include damage to the bearing retainer, crushed steel balls, or fractures in the inner or outer ring ； Peeling, chipping, etc., of the alloy layer in sliding bearings. In this case, there is abnormal noise at the bearing, with loud sounds; it is necessary to disassemble the bearing promptly for inspection and replacement.