Leakage points were found on the surface of the stator shield
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A leakage was found in the stator shield sleeve of this shielded pump; there were traces of fluid on its surface, with no signs of impurity wear or scratches. Additionally, there are corresponding friction marks on the surface of the rotor shield sleeve. Now, I’ll show you the stator shield sleeve; I would like to ask the experts why the stator shield sleeve is leaking!
Is there wear on the bearings, and what is the radial clearance between the bearings and the shaft sleeves?
Overheating, the insulating paint in the stator. . .
The last edit to this post was made by 3983596_FPPZ on 2020-6-1 at 10:03; increasing the flushing flow rate is most likely due to cavitation caused by local high temperatures
What do you mean, expert? What does it have to do with insulating paint?
I didn’t understand it at first, but after I replaced the motor with a new one and switched the shielding sleeve to HC material, no signs of wear were observed after it was in operation for some time
There are several possibilities: 1. The stator shielding sleeve was not dried properly, leaving moisture inside； 2. There are defects in the welding of the stator shielding sleeve, allowing materials to enter ； 3. Quality issues with the insulation paint between stator turns generate volatile gases; if any one of the above three conditions exists, an increase in temperature during operation can cause the shielding sleeve to bulge and crack, leading to friction between the rotor components.