Md mining wear-resisting multistage centrifugal pump mechanical seal assembly and inspection

md mining wear-resisting multistage centrifugal pump mechanical seal repair process is relatively complex, to ensure that the assembly after mining wear-resisting multistage centrifugal water pump mechanical seal leakage, the mechanical seal technology dimension check is necessary.

md mining wear-resisting multistage centrifugal pump mechanical seal assembly technique dimensional check

1, measure the size of the ring and static ring sealing surface. This data is used to verify the radial width of dynamic and static ring, elected in different friction material, hard material friction surface radial width should be bigger than soft 1-3 mm, otherwise easy to face the hard stuff into soft material of end face edges and corners.

2, check the ring and static ring and the clearance between the shaft or the shaft sleeve, the inner diameter of the static ring 1-2 mm, usually larger than the diameter of axle for ring, in order to ensure floating, inner diameter larger than the diameter of axle 0. 5-1 mm to compensate for shaft vibration and deflection, but the gap not too big, otherwise it will make the ring seal card into and cause the destruction of the mechanical seal function.

3, check of mechanical seal force. We usually speak is mechanical seal force of end face specific pressure, face pressure to appropriate, too, will make the mechanical seal friction surface heating, accelerate the end wear, increase the friction power; Is too small, easy to leak. End face specific pressure is set at the mechanical seal design, when we are in the assembly can only be defined by measuring mechanical seal force. Usually measurement method makes measurement installed static ring end face to the end of the capping vertical distance, when measuring ring end face to the end of the capping vertical distance, difference of the two is extremely tight force of mechanical seal.

4, measure the length of the compensation spring is changing. Spring change will directly affect the performance of mechanical seal face pressure. Usually spring in the long run length is shorten, the compensation spring on the ring of the mechanical seal will also, because of the centrifugal force and deformation.

5, measure the length of the static ring anti-rotating pin and pin hole depth, to prevent the pin is too long the static ring cannot be assembled in place. The problem will damage the mechanical seal.

md mining wear-resisting multistage centrifugal water pump mechanical seal assembly

after cleaning the dimensional check inspection, technology of the mechanical seal can be returned it, in the process should pay attention to the following:

1, the assembly all sealing ring for the coated with soap and water when the lubricant, such as the damaged aprons so that you can avoid the assembly process. Between dynamic and static ring sealing surface coated with grease, prevent the dynamic and static ring sealing surface wear in front of the pump drive.

2, floating ring assembly, must be careful not to fall over the floating ring spring, so spring touch down after the influence on the performance of the floating ring float. After floating ring assembly, can press gently floating ring, to determine whether there is a good floating performance.

3, installing a seal to should take put down gently, prevent damaged seals, when installation should be sealed and cavity is swabbed clean.

4, fastening machine gland fastening bolts should be uniform stress, prevent damage of uneven mechanical seal. For fast loading type mechanical seal after the whole assembly must not forget will locate the positioning of the radial movement way away from the shaft.

md mining wear-resisting of multistage centrifugal pump mechanical seal check

the working principle of mechanical seal for mechanical seal inside without any impurities. Thoroughly cleaning before assembling mechanical seal ring and static ring, shaft sleeve, etc. Review:

1, the dynamic and static ring surface exists defects such as scratch, crack, these flaws will cause serious leakage of mechanical seal. Conditional can use a special tool to check the sealing face whether level off, sealing surface uneven, pressure water will enter the assembly of mechanical seal ring sealing surface activity, separate of dynamic and static ring, mechanical seal failure. When necessary, can make tooling hydrostatic test before assembly.

2 and see if there are any impact of dynamic and static ring seat sealing defects. Such as dynamic and static ring seat with dynamic and static ring gasket surface defects such as whether there is a scar.

3, check whether compensation spring mechanical seal damage and deformation, if stubborn coefficient change.

4, check the sealing sleeve defects such as the existence of burr, the trench.

5, cleaning check all gasket exists defects such as cracks, porosity, measurement of synthetic diameter is within the scope of the working poor.

6, also check the pump mechanical seal with pumping mechanism of spiral line whether there is crack, break the blemish such as.

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