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Maintenance of Packing Seal of Centrifugal Pump

作者: 发布时间: 2019-05-08 58 次浏览

The repairing methods of packing seal of centrifugal pump are as follows:

1. Clean the packing box and check whether there are scratches and burrs on the surface of the shaft. Packing box should be cleaned and shaft surface should be smooth.

2. Check the shaft runout and the unbalance of the rotor runout should be within the allowable range, so as to avoid excessive vibration and unfavorable to the packing.

3. Coating sealant or lubricant suitable for medium in packing box and shaft surface.

4. For the packing of rolled package, first take the same size stick as the journal, wrap the packing around it, and then cut it off with a knife. The edge of the knife should be 45 degrees inclined.

5. Filling should be filled one by one, not several at a time. The method is to take a filler, coat it with lubricant, each hand holds one end of the filler interface, pull it out along the axis, make it spiral, and then insert it into the journal from the incision jacket. Do not pull apart along the radial direction to avoid uneven interfaces.

6. Take a metal bush of the same size as the packing box or with lower hardness than the axle, push the packing into the deep part of the box, and apply pressure on the bush with a pressure cap, so that the packing can be pre-compressed. The pre-compression is 5%~10% and the maximum is 20%. Turn the shaft for another week and take out the sleeve.

7. Fill the second and third roots in the same way. Note that when the number of fillers is 4 to 8, the interface should be staggered by 90 degrees, two fillers by 180 degrees, and three to six fillers by 120 degrees to prevent leakage through the interface.

8. After filling the last filler, the cover should be applied, but the pressure should not be too large. At the same time, the hand is used to rotate the shaft, so that the assembly compaction force tends to parabola distribution. Then relax the cap slightly.

9. Conduct operation test, if it can not be sealed, then press some packing; if the heat is too high, relax it a little. It can be put into use only when droplet leakage and fever are not high (the temperature of filler can only be 30-40 C higher than the ambient temperature).