What are the negative consequences of a large gap between the rotating ring and the stationary ring?
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What are the negative consequences of an increased gap between the rotating ring and the stationary ring? Logically, they should remain in close contact during operation, but what would happen if the impeller, together with the shaft, creates a gap between them? What adverse consequences might arise?
Personal opinion: Axial movement of the rotating ring; wear of the O-ring in the shaft sleeve is increasing； A small amount of shaft play should be fine; if it’s too large, there will be leakage! ! 1
If the impeller causes the shaft to deflect, it is very likely to result in a deflection of the rotating ring. Although there are compensation mechanisms, wear is definitely uneven. This can easily lead to leaks~
Reply to 1# green0031: If it happens as you imagine, there will be a sudden massive leak, leading to an accident.
If the gap increases uniformly, there should be no harm, meaning only an increase in leakage. I’m worried that it might be damage caused by liquid ingress or solid particles.
An increase in leakage can sometimes cause cavitation, which also affects the pump’s performance
The question is inappropriate; there is already a gap between the rotating and stationary rings. If it is too large, there will be leaks; if it is too low, the seal will wear out or even the ring will break. I’m afraid the movement will be too large.
Generally, the installation of mechanical seals requires specifications for axial and radial runout. Under normal circumstances, when the vibration is within acceptable limits, the stationary and rotating rings are pressed together by a compensation mechanism; during operation, a very thin layer of liquid film is formed, which serves as a lubricant. It also serves a sealing function. If the axial play is large, as the original poster said, the stationary and rotating rings will not fit tightly together. It’s simply a massive amount of leakage.