Common sense for maintenance of mechanical seals

The seal.com/" target="_blank">mechanical seal is a sealing device composed of two sealing elements (static ring and moving ring) that are perpendicular to the shaft and have bright and flat appearances that are attached to each other and are relatively rolled. It is based on the pressure of the sealing medium that the appropriate pressing force occurs on the touching surface (end face) of the rotating dynamic ring and the static ring, so that the two end faces are tightly connected, and the mechanical seal between the end faces holds a thin layer of liquid The film is intended to reach the seal. This layer of liquid film mechanical seal has fluid dynamic pressure and static pressure, and plays the effect of smooth and balanced force.

1. Cleaning and inspection of mechanical seals

1) The working principle of mechanical seals requires no impurities inside the mechanical seals. Before assembling the mechanical seal, completely clean the moving ring, static ring, shaft sleeve and other components.

2) Check whether there are any shortcomings such as scratches and cracks on the surface of the dynamic ring. These shortcomings will cause severe leakage of the mechanical seal. If conditions permit, you can use special tools to check whether the sealing surface is flat and the sealing surface is not flat. Pressure water will enter the dynamic ring sealing surface of the mechanical seal, separating the dynamic ring, and the mechanical seal fails. If necessary, manufacturing tools can be tested for hydraulic pressure.

3) Check whether the dynamic ring seat has any disadvantages affecting the seal. For example, are there any disadvantages in the appearance of the dynamic ring seat and the dynamic ring sealing ring?

4) Check whether the mechanical seal compensates the tension spring for damage and deformation, and whether the tenacity coefficient changes. The circumferential speed of the sealing surface is usually indicated by the uniform circumferential speed of the sealing surface. Seals with a peripheral speed higher than 25 m / s are generally considered to be high-speed seals. Regarding high-speed seals, in order to avoid the effects of centrifugal force and mixing heat, a stop-type seal should be selected. High peripheral speed, pV value is too high, you can use the central ring and other methods to reduce the peripheral speed, or choose fluid dynamic pressure seal or hydrostatic pressure seal.


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