What are the maintenance precautions for mechanical seals? Machinery Seal

What are the maintenance precautions for mechanical seals?




2021-07-14 11:12






The mechanical seal is a sealing assembly composed of two sealing elements (stationary ring and moving ring) perpendicular to the shaft, with bright and flat surfaces that are attached to each other and relatively rotated.

It relies on the pressure of the sealing medium to produce an appropriate pressing force on the contact surface (end face) of the torsion moving ring and the static ring, so that the two end faces are closely connected, and a very thin liquid film is connected between the end faces to achieve sealing. indicator. This layer of liquid film has liquid dynamic pressure and static pressure, which plays the role of lubrication and balance force.

1. Demolition and inspection of mechanical seals

1) Check whether there are scratches on the surface of the dynamic and static rings, mechanical seal lines for cracks and other defects. The existence of these defects will cause the mechanical seal to leak. If conditions permit, special tools can be used to check whether the sealing surface is flat. If the sealing surface is not uniform, pressure water will enter the sealing surface of the dynamic and static rings of the assembled mechanical seal, separate the dynamic and static rings, and the mechanical seal will fail. If necessary, the tooling can be manufactured and tested for hydraulic pressure before assembly.

2) The working principle of the mechanical seal requires no impurities in the mechanical seal. Before assembling the mechanical seal, the moving ring, static ring, shaft sleeve and other components should be completely removed.

3) Check whether there are defects affecting the sealing of the dynamic and static ring seats. For example, whether there are defects on the joint surface of the dynamic and static ring seat and the dynamic and static ring sealing ring.

4) Check whether the compensation spring of the mechanical seal is damaged or deformed, and whether the stiffness coefficient changes.