Troubleshooting Of Mechanical Seal Of Water Pump

 Troubleshooting Of Mechanical Seal Of Water Pump

Mechanical seal is also called end face seal. It relies on the pressure of spring and sealing medium to produce appropriate pressing force on the contact surface of rotating moving ring and stationary ring to make the two end faces closely fit. An extremely thin oil film is maintained between the end faces, and the medium has great resistance when passing through, so as to prevent liquid leakage, so as to achieve the purpose of sealing, and lubricate the moving ring and static ring at the same time. If adjusted well, there can be no leakage at all.Get more news about Submersible Pump Seals,you can vist our website!

1 Characteristics of mechanical seal of water pump

The main advantage of mechanical seal of water pump is reliable seal, with little leakage in a long service cycle; Long service life, generally about 5 years; Long maintenance cycle. However, the mechanical seal has complex structure, high manufacturing and installation accuracy, high cost and high technical requirements for maintenance personnel. Because the mechanical seals used on oil pipelines are built-in, the oil pump is often disassembled when repairing the mechanical seal, resulting in heavy workload. Therefore, it is very important to ensure the reliability of mechanical seal and prolong the service life of mechanical seal.

2. Problems easy to occur in the mechanical seal of water pump

In the process of use, the main problems of mechanical seal are excessive leakage and high temperature. Touch the mechanical seal gland by hand. If it cannot stay on it, it indicates that the temperature is too high. The leakage amount on each side shall not exceed 60 drops / min. if it flows in a linear shape, it indicates that the leakage amount is too large. It can be determined whether to observe the operation; If the fuel is injected outward, stop the engine immediately for inspection.

3 control measures taken

3.1 ensure the quality of parts

Before leaving the factory, the mechanical seal must be tested for sealing performance and have a certificate of conformity. After long-term operation of the mechanical seal, the wear of the moving ring and the static ring, the corrosion and wear of the spring and shaft, the wear, aging and deformation of the sealing rubber ring can cause the leakage of the seal, which must be repaired or replaced with new parts. The sealing surfaces of the moving ring and the stationary ring shall be free of cracks, missing corners, scratches, pitting, flash and eccentric wear, and the scratches and pitting shall not penetrate the whole sealing end face. If the repaired dynamic and static ring is used, the sum of the boss heights of the dynamic and static ring shall not be less than 3mm, and the height of a single boss shall not be less than LMM, so as not to affect the heat dissipation. After the installation of the moving ring, it shall be able to move flexibly on the shaft. After pressing the moving ring against the spring, it shall be able to bounce back freely to keep the vertical and parallel of the moving and stationary rings. The specification of the dynamic and static ring sealing rubber ring shall comply with the drawing, and the surface shall be free of damage, uneven thickness and uneven hardness. The sealing rubber ring shall be replaced during overhaul. The outer surface of the spring shall be clean and free of rust. Before use, the length and shape detection and pressure test shall be carried out. The pressure difference of each group of springs in the specified compression length shall meet the requirements, and the pressure error of each group of springs in the specified compression length shall meet the requirements. The allowable deviation of free length shall not exceed 0.5mm, and the compression amount shall not be too large or too small. The required error is ± 2mm. The seal sleeve and the pump shaft cannot be made of the same material, and the parallelism tolerance of the end faces on both sides and the non perpendicularity tolerance with the axis shall not exceed ± 0.20mm.