Wear analysis of vulnerable components in shielded pumps
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I currently have a high-temperature separation-type canned motor pump. Upon disassembling it, I found that there was dry friction due to a lack of fluid in the middle area of the front shaft sleeve; the front thrust disk was in good condition. The rear shaft sleeve showed slight wear, and the rear thrust disk also suffered from dry friction due to a lack of fluid. What puzzles me is the fact that dry friction occurred in both the front and rear areas, rather than on the same side – what could be the reason for this?
There are many reasons for liquid shortage in shielded pumps, but I won’t go into detail here. Wear of this type, which is posterior-axial and anterior-radial, can be analyzed as fluid instability within the pump. Wear of the rear thrust disc indicates an increase in the inlet flow rate at the front, causing the entire shafting to move backward ； Increased torque at the front bearing, increased vibration, and radial wear. I hope it can be of some reference to you.