Let’s discuss the reasons for uneven wear of the shaft sleeves
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For the long-axis submersible pump, there is obvious uneven wear on the rotor shaft sleeve, while the guide bearings show uniform wear. The current measurements indicate that the shaft bending is within acceptable limits. Let’s discuss what other factors could cause uneven wear on the shaft sleeve
The long axis is too long, with insufficient support; the moment of inertia causes the long axis to bend!
Is it caused by visual inspection showing shaft bending? ? You get a zero score for this! There is also an imbalance in the radial forces of the impeller, and its dynamic balance is not up to standard!
Add two more photos; the wear is quite noticeable
Why is no one interested? I think it’s still worth discussing
Send a few pictures to take a look! How did you determine that the shaft runout is acceptable!
The shaft bends properly in a cold state, but it doesn’t work under operating conditions (at certain temperatures) due to its excessive length.
You need to check what that positioning point is; if the rotating part is offset relative to that positioning point, it will cause uneven wear. As for that point, I think you should measure the position of the bearing in its free state
The rotor shaft sleeve shows obvious uneven wear, while the guide bearings are worn evenly. Generally, imbalance is the cause of shaft bending during operation; however, due to the high stiffness of the shaft, its deformation is reversed when the machine stops running.
The distance between the bearing support points along the long axis is too large, resulting in insufficient stiffness and significant radial runout of the shaft； The dynamic balance is poor after installing the impeller