Reasons for rubber damage in single-spring mechanical seals
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With single-spring mechanical seals, it’s always the rubber ring that gets damaged, while the sealing surface remains intact. I think this is caused by axial thrust forces. I would like to ask the experts to analyze the reason for this issue or to suggest whether another type of mechanical seal could be used. The inner diameter of the shaft is 90, and the outer diameter of the mechanical seal is 125; can it be replaced with a mechanical seal that uses multiple springs?
As long as the size of the sealing chamber is appropriate, any seal will do
The dynamic ring auxiliary seal ring comes into direct contact with the spring, which causes the seal ring to flow into the gap between the spring and the shaft sleeve. This phenomenon is caused by the thrust forces generated during the adjustment of the mechanical seal; it is recommended to install a thin thrust ring at the location where the spring meets the seal ring, in order to prevent the seal ring from flowing into that gap.
It is placed between the spring and the rubber ring; its inner diameter just needs to be slightly larger than that of the shaft sleeve to allow free axial movement. Since I only saw partial images, I’m not sure if this will work