Ask for help: Reasons for oil leakage of anti-spiral seal type oil seal
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The bearing chamber of the main feed water pump of our power plant uses an oil seal with a reverse thread groove. Leakage has often occurred recently. The disassembly and inspection clearance is also qualified, there is no abnormal wear, and the oil pressure is normal. I don’t know the cause of the oil leakage. Can anyone give me some guidance? Thank you.
If the oil return is not smooth, look at the ventilation holes on the bearing bush. The ventilation holes are mainly connected to the atmosphere. Since the oil tank is at a low position, a siphon effect is formed, just like a turbine oil tank needs to be equipped with a smoke exhaust fan.
Look at the viscosity of the lubricating oil and the oil return channel at the bottom of the oil damper
Well, now I also suspect that the oil return hole is not aligned properly.
The oil return channel of the oil damper can be slightly larger