Seal wear analysis
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This seal is used for condensate pumps and has a single large spring seal. The contact width of the dynamic and static rings is 5mm. A 1.5mm boss is ground into the middle of the contact surface of the static ring, and a 1.5mm groove is ground into the middle of the contact surface of the moving ring. The materials of the moving and static rings are the same. What causes this wear and tear?
1.5mm is the width of the boss exactly in the middle of the contact width
1. The designed contact surface is unlikely to be 5mm. 2. There are impurities. 3. The amount of compression is inappropriate. 4. Even if the sealing surfaces are worn and the sealing surfaces rub against each other, there is generally no leakage. Because the grinding is docile. Unless it's not clean.
The hardness difference is too small. The contact area is too large.
The original sealing ring has a narrow surface and the static ring has a wide surface. Depending on the wear and tear, the compression amount is a bit large. Furthermore, the material of the dynamic and static rings is soft and the medium is not clean. Check whether the flushing pipe is blocked.
The medium temperature is high, the liquid film on the end face is poorly formed, the lubrication is poor, and semi-liquid friction occurs. It is recommended that the 21st seal flushing plan be used for the seal, and the flushing pipe is equipped with a heat exchanger to cool down before flushing the seal.
Since it is a condensate pump, the medium temperature should not be high and the medium should be clean. Then you should first check whether the machine seal water pipe is blocked and clear the pipe. ； Try turning the compression down a little more. Try this first
Is the usage cycle normal? The widths of dynamic and static friction pairs are different, and normal use of wide rings will cause concave wear. I understand that you are struggling with the concave wear of the moving ring. The moving ring can also be a wide ring.
1. Change to sealing material: Hard encounter with softness
2. The amount of compression is too large, adjust it smaller.