Introduce the working principle of mechanical seal for slurry pump

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The back pressure state is a bad working state. The particles and impurities in the medium can easily enter the sealing surface and make the sealing invalid. The main part of the grinding shaft is the rubber bellows, and because the upper sealing surface is in a poor lubrication state, the friction torque between the dynamic and static rings is greater than the transmission torque between the rubber bellows and the shaft, resulting in relative rotation. The dynamic and static ring auxiliary seals are corroded by the weak acid and weak alkali in the sewage, and the rubber parts are inelastic. The working principle of the mechanical seal for slurry pump requires that there are no impurities inside the mechanical seal. Before assembling the mechanical seal, thoroughly clean the moving ring, static ring, shaft sleeve and other components, and check whether there are scratches, cracks and other defects on the surface of the dynamic and static rings. Defects can cause serious leakage of mechanical seals. If necessary, tooling can be made to perform hydraulic test before assembly to check whether there are defects affecting the sealing of the dynamic and static ring seats

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The mechanical seal for slurry pump is caused by the deformation of the sealing surface, and the probability of leakage of the mechanical sealing surface is very high. If the pump mechanical seal leaks when the pump is started, and there is no damage when the sealing surface is dismantled and inspected, then the deformation of the mechanical seal should be checked with a flat crystal. If deformation occurs, use a flat crystal to check the change of the interference band of the sealing surface. The deformation of the sealing surface exists between the moving ring and the static ring.u200bu200b

The dynamic sealing system of the cylinder block adopts the main sealing design, generally using a U-shaped sealing ring. The design of the reciprocating dynamic sealing system of the hydraulic cylinder began to use a more complex composite design of U-ring and coaxial sealing components. The sealed static ring is usually fixed on the housing, and the moving ring rotates with the shaft through a spring and a spring seat. The gaps formed by the static ring and the casing, the moving ring and the shaft are sealed with forming packings. A relative sliding surface, that is, a dynamic sealing surface, is formed on the end surfaces of the movable ring and the stationary ring in contact. In order to ensure good sealing, the dynamic sealing surface should be very straight and smooth. The spring force and the pressure of the fluid being sealed keep the moving ring against the stationary ring. Since the moving ring and the shaft are connected by a spring, the fit between the moving ring and the static ring is less affected by the vibration and swing of the shaft. The static ring is generally made of soft materials with good lubricity such as graphite, filled PTFE, etc., and the moving ring is mostly made of cemented carbide, ceramics and other materials.