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Second, the pipe sewage pump to ensure adequate cooling and cooling Adjust the cooling pipe valve opening, to ensure that the mechanical seal cooling pipe is unobstructed, open the drain valve when the pump pump to drain the net seal cavity gas.
Third, the pipe sewage pump to ensure the installation accuracy Disassembly pump mechanical seal, the static and dynamic ring to be cleaned and smeared a small amount of clean lubricant on the secondary side, to take into account the high-pressure and low-pressure end, non-bump. Static pressure gland installed hard to be uniform, to prevent pressure offset, with feeler inspection, the upper and lower left and right position deviation of not more than 0.05mm; check the gland and shaft diameter with the gap, around to be uniform, the allowable deviation of each point Greater than 0.1ram. Install the pump mechanical seal parts of the pump shaft runout does not exceed 0.05mm. Prior to the pump cover and seal the end cover, to carefully review the installation of mechanical seal positioning size, if the positioning size does not meet the requirements can be adjusted between the sleeve with steel pad, but the steel pad to high precision, the thickness difference of not more than 0.01mm . Measurement of mechanical seal sleeve radial runout and the sealing surface of the end beat to meet the requirements.
Mechanical seals on the run, where gland loose sealing surface to move the case, the dynamic and static ring parts must be replaced, should never be re-tighten the continued use. Because after such a loose, friction pair of the original trajectory will change, the contact surface of the sealing performance can easily be destroyed.
Fourth, the pipe sewage pump adjust the end pressure ratio is more important than the sealing performance and service life of an important parameter, it sealed structure type, spring size and medium pressure. Excessive pressure than the end face will increase the friction pair; than the pressure is small, easy to leak, often given by the manufacturer a suitable range, the end pressure than the general take 3 ~ 6kg / cm2. Adjust the pressure is to adjust the compression of the spring size. The free length of the spring is denoted by A, the load that the spring stiffness produces when the unit compression amount is k, and the required specific pressure is represented by P, all of which are given by the manufacturer. Compressed size with B said, P / A-13 = k, resulting in 13 = Ae / k, which is compressed spring installation size. If the spring is oversized, the thickness of the adjusting pad can be increased between the spring seat and the spring. If the size is too small, the thickness of the adjusting pad is reduced. The thickness of the adjusting pad is measured by a micrometer.
First, the pipe sewage pump parts to ensure quality pipe sewage pump mechanical seal to be done before the seal performance test, and a certificate. Long-term operation of the mechanical seal, ring and static ring wear, spring and shaft corrosion wear, sealing rubber ring wear, aging, deformation, etc., can cause a sealed leak, you must repair or replace the new pieces. Moving ring and static ring sealing surface without cracks, off angle, scratches, pitting, flash and partial wear, scratches, pitting can not penetrate the entire sealing face. If you use the static and dynamic ring repaired, static and dynamic ring boss height of not less than 3mm, and a single boss height of not less than lmm, so as not to affect the cooling. After the moving ring is installed, it should be ensured that it can be flexibly moved on the shaft. After the moving ring is pressed against the spring, it should be able to rebound freely and maintain the vertical and parallel movement rings. Ring static ring seal specifications in line with the provisions of the drawings, the surface shall not be damaged, uneven thickness and uneven distribution of soft and hard, to be replaced when the overhaul sealant. The outer surface of the spring should be clean and free from rust. Before use, the length profile test and pressure test should be carried out. The pressure difference between each set of springs at the specified compression length should meet the requirements. The pressure error of each set of springs at the specified compression length should meet the requirements. Free length tolerance does not exceed 0.5mm, the amount of compression can not be too large or too small, the required error ± 2mm. Seal sleeve and pump shaft can not use the same material, both sides of the parallelism tolerance and axis of the non-perpendicularity tolerance does not exceed ± 0.20mm.