Maintenance method of centrifugal pump parts

First, packing method of maintenance

1, clean the centrifugal pump packing box, and check the shaft surface whether there is a scratch, burr, etc. Packing box should be clean, shaft surface should be smooth.

2, check the shaft jitter, rotor unbalance should be within the scope of the permit, in order to avoid excessive vibration, adverse to the packing.

3, in the packing box and shaft surface sealant or adapted to medium of lubricant.

4, to the roll packing packing, it sticks to take root and shaft neck size is the same, to conceal its packing, then cut with the knife, knife edge best 45 ° incline.

5, packing to loading by root, not to fill a few. Packing method is to take a root, which are coated with lubricant, hands each holding one end of the filler interface, along the axial, spiral, coat again from the incision into the journal. Not along the radial direction, in order to avoid interface.

6, in a material or the shaft with stuffing box size the lower hardness of the metal sleeve, push the packing deep into the box, a certain pressure and gland of shaft sleeve, make more pre compression of packing. Pre compression is 5% ~ 5%, the biggest to 20%. A week then axis rotation, remove the collar.

7, in the same way, loading the second and third. Note that when packing for 4 ~ 8, when loading, should make the interface 90 ° staggered; Two packing 180 ° staggered; 3 ~ 6 120 ° staggered, in case of leakage through interfaces.

Eight, after the last filler loading, application of gland pressure, but pressure force shoulds not be too big. Turn the shaft by hand at the same time, lead to the parabola distribution assembly clamping force. And then slightly relax a press cover. 9 and running test, if can't seal, compress some packing; If the fever is too big, loosen up. So the drip leakage and heat is transferred to the only a little so far (packing parts temperature higher than the environment temperature only 30 ~ 40 ℃), can be put into use.

Centrifugal pump packing seal assembly technology requirements, the packing seal, should comply with the regulations of the technical documentation. If no provisions, shall meet the following requirements:

1, check the shaft in the sealing components of the radial runout, without the permission of the shaft radial runout quantity within the scope of 0.03 to 0.08 mm;

2, liquid seal ring and the diameter of the shaft sleeve clearance is 1.00 ~ 1.50 mm, liquid seal ring and the diameter of the stuffing box clearance is 0.15 ~ 0.20 mm;

3, packing gland and the diameter of the shaft sleeve clearance is 0.75 ~ 1.00 mm, around the gap should be uniform;

4, the diameter of the packing gland and packing box clearance generally is 0.10 ~ 0.10 mm;

5, with the bottom of the packing ring, the bottom ring and the diameter of the shaft sleeve clearance is 0.70 ~ 1.00 mm;

6, packing pressure, liquid liquid seal ring into the hole should be aim and liquid seal tube, or slightly towards the lateral seal ring;