Install the mechanical seal of the pipeline sewage pump

First, GW pipe sewage pump to ensure quality parts of the sewage pump mechanical seal in the factory to be done sealing performance test, and a certificate. Mechanical seal after a long run, so that the ring and the static ring wear, spring and shaft corrosion wear, seal apron wear, aging, deformation, etc., can cause leakage of the seal must be repaired or replaced. The sealing surfaces of the moving ring and the stationary ring shall not have any cracks, angles, scratches, pittings, flashes and eccentric wear, scratches, and pits that can not penetrate the entire sealing face. If the use of repair movement ring, the static and dynamic ring of the convex height of not less than 3mm, and a single boss height of not less than lmm, so as not to affect the heat. After moving the ring should be installed to ensure flexibility in the axis of movement, the dynamic ring pressure spring should be able to spring back to keep the static and dynamic ring vertical and parallel. Static and dynamic ring seal apron specifications in line with the drawings, the surface shall not be damaged, uneven thickness and uneven hardness, in the overhaul to replace the sealing apron. The outer surface of the spring should be clean and free from corrosion. The length profile and pressure test shall be carried out before use. The pressure difference between each set of springs in the specified compression length shall meet the requirements. The pressure error of each set of springs shall meet the requirements. Free length tolerance does not exceed 0.5mm, the compression can not be too large too small, the required error of ± 2mm. Gland and pump shaft can not use the same material, both sides of the parallel end of the tolerance and the axis of the non-vertical tolerance does not exceed ± 0.20mm.

 

Second, the pipeline sewage pump to ensure adequate cooling Lubrication adjustment cooling pipe valve opening, to ensure that the mechanical seal cooling pipe patency, open the tank when the drain valve to drain the net sealed cavity gas.

 

Third, the installation of pipeline sewage pump to ensure the accuracy of dismantling pump mechanical seal, the static ring to clean, and friction in the Vice-surface coated with a small amount of clean oil, to take into account the high-pressure side and low pressure side, is prohibited bump. Static ring gland installation force to be uniform, to prevent bias, with a feeler check, the upper and lower left and right position of the deviation is not greater than 0.05mm; check the gland and shaft diameter with the gap around to be uniform, the points allow deviation is not Greater than 0.1ram. Install the pump mechanical seal parts of the pump shaft radial runout of not more than 0.05mm. And the pump cover and sealed end cover, to carefully review the mechanical seal installation location size, if the positioning size does not meet the requirements, can be used in the steel sleeve between the sleeve adjustment, but the steel pad to high precision, the thickness difference of not more than 0.01mm . Measure the radial runout of the mechanical seal and the face runout of the sealing surface to meet the requirements. On the operation of the mechanical seal, where there is loose gland to move the sealing surface of the case, the ring parts must be replaced, should not be re-tightened to continue to use

. Because in this loosening, the friction of the original trajectory will change, the contact surface of the sealing performance can easily be destroyed.

 

Fourth, the end of the sewage pipe to adjust the pressure side of the sewage pressure ratio is related to sealing performance and service life of the important parameters, it is sealed with the structure type, spring size and medium pressure. Than the pressure is too small is easy to leak, often given by the manufacturers to a suitable range, the end face than the pressure generally take 3 ~ 6kg / cm2. Adjust the specific pressure is to adjust the compression size of the spring. The free length of the spring is denoted by A, the spring load produces a unit of compression, and the required specific pressure is denoted by P, which are the parameters given by the manufacturer. The compressed size is denoted by B, then P / A-13 = k, resulting in 13 = A-e / k, which is the size of the spring after installation compression. If the spring after the installation of the size is too large, in the spring seat and spring to increase the adjustment between the pad thickness, size is too small to reduce the adjustment of the thickness, adjust the thickness of the mat with a micrometer measurement.