Seek analysis of shaft fracture in single-stage double-suction pumps
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One of my circulation pumps lost pressure suddenly while in operation; the main shaft broke at the bearing step on the motor side after it was removed! It’s a steel rod with a diameter of φ120mm! ! ! Attached are photos; I hope someone experienced can analyze what the cause is. Thank you! ! ! (High-voltage motor power: 900 KW)
This post was last edited by yehuaqi007 on 2017-7-21 08:42. The heat generated by the bearing caused its temperature to rise, which reduced the torque of the shaft. Additionally, there were some defects at the shaft ends, and the lack of lubrication led to the bearing seizing, resulting in excessive torque on the main shaft and ultimately causing it to break.
The bearing failed, resulting in excessive torque that caused the shaft to break at its weakest point.
There are many possible reasons, such as material issues； overload ； fatigue ； Unbalanced forces~~In any case, the process and equipment specialists should conduct a thorough analysis~~
Poor bearing cooling and high temperatures lead to excessive torque? The bearing housing is severely worn
Excessive torque; there are defects inside the material!
Bearing failure is the primary cause of damage.
The outer rings of the bearings have burned blue. After it was proven that the bearing was not functioning, the torque on the shaft increased, causing the shaft to break.
Fatigue fracture; material defects are ruled out. It is generally caused by stress concentration resulting from a lack of funds on the surface.