Reasons for high bearing temperature in centrifugal pumps

The main reasons for the high temperature rise of centrifugal pump bearings are: (At this time, as long as attention is paid to observation, the cause is identified in a timely manner, and handling is not difficult)
1) The bending or non concentricity of the centrifugal pump shaft can cause the pump to vibrate, resulting in bearing heating or wear.
2) Due to the increase in axial thrust (such as when the balance plate and balance ring in a centrifugal pump are severely damaged), the axial load borne by the bearing increases, leading to bearing heating and even damage.
3) Insufficient or excessive lubricating oil (grease) in the bearing, poor quality, and impurities such as mud, iron filings, etc. inside; Sliding bearings sometimes generate heat due to the oil ring not rotating and not being able to carry oil.
4) The bearing clearance does not meet the requirements. If the fit between the inner ring of the bearing and the centrifugal pump shaft, or the outer ring of the bearing and the bearing body is too loose or too tight, it can cause the bearing to heat up. (If the fit is too tight, the bearing will not rotate flexibly; if the fit is too loose, it will cause the inner ring of the bearing to rotate or the entire bearing to rotate in the centrifugal pump of the bearing body).
5) The static balance of the centrifugal pump rotor is not good. The radial force of the centrifugal pump rotor increases, causing an increase in the load on the centrifugal pump bearings and resulting in bearing heating.
6) When a centrifugal pump operates under non design operating conditions, vibration can also cause the bearings of the centrifugal pump to heat up.
7) The bearing is damaged (including quality issues with the purchased bearing itself), which is often a common cause of bearing heating, such as damage to the rolling bearing cage, crushing of the inner ring by the steel ball, or fracture of the outer ring; The alloy layer of sliding bearings peels off, blocks fall off, etc. In this situation, the sound at the bearing is abnormal and the noise is loud. The bearing should be promptly disassembled for inspection and replaced.