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Maintenance method for packing seal of centrifugal pump

Time of Release:

2023-09-11

The packing seal of a centrifugal pump is an important part of the sealing effect, so users need to master its maintenance methods so that when the packing seal of the centrifugal pump fails, it can be dealt with in a timely manner without affecting the normal operation of the pump. The following is an introduction to the packing seal maintenance methods of centrifugal pumps.

Maintenance method for packing seal of centrifugal pump

         

  The packing seal of a centrifugal pump is an important part of the sealing effect, so users need to master its maintenance methods so that when the packing seal of the centrifugal pump fails, it can be dealt with in a timely manner without affecting the normal operation of the pump. The following is an introduction to the packing seal maintenance methods of centrifugal pumps.

  1. Clean the packing box of the centrifugal pump and inspect the surface of the shaft for scratches, burrs, etc. The packing box should be cleaned thoroughly and the surface of the shaft should be smooth.

  2. Check the shaft runout, and the imbalance of rotor runout should be within the allowable range to avoid excessive vibration and adverse effects on the packing.

  3. Apply sealant or lubricant suitable for the medium to the packing box and shaft surface.

  4. For the filling material packaged in rolls, first take a wooden stick with the same size as the shaft neck, wrap the filling material around it, and then cut it with a knife, with a 45 ° inclined edge.

  5. Fillers should be filled one by one, and not several at a time. The method is to take a piece of packing, apply lubricant, hold one end of the packing interface with both hands, pull it apart along the axis, make it spiral, and then wrap it into the shaft neck through the incision. Do not pull along the radial direction to avoid uneven interfaces.

  6. Take a metal shaft sleeve of the same size material as the packing box or with lower shaft hardness, push the packing into the deep part of the box, and apply pressure to the shaft sleeve with a pressure cap to achieve pre compression of the packing. The pre compression shrinkage is 5% to 10%, to 20%. Rotate the shaft one more turn and remove the shaft sleeve.

  7. Using the same method, fill the second and third pieces. Note that when the number of fillers is 4-8, the interfaces should be staggered 90 ° from each other during filling; Two fillers staggered by 180 °; 3-6 pieces should be staggered by 120 ° to prevent leakage through the interface.

  8. After filling a filling material, it should be pressed tightly with a cover, but the pressure should not be too large. Simultaneously rotate the shaft by hand to distribute the assembly clamping force in a parabolic pattern. Then slightly relax the pressure cap.

  9. Conduct a running test, and if it cannot be sealed, tighten some of the packing; If the fever is too high, relax it a bit. Only when the temperature at the filling area is only 30-40 ℃ higher than the ambient temperature, can it be officially put into use.
 


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