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Sliding seals: a compromise between wear and leakage

Release time:

2019-06-11 12:30

Source:

SlideSealing ring: A compromise between wear and leakage
 
Sliding seals are traditionally used in pumps, mixers, agitators and centrifuges. In these devices, sliding seals are often the source of accidents. As long as the correct choice of the right seal can reduce this accident. So how to choose the right seal? What solutions do suppliers provide for users?
In a process pump professional and technical lectures, from the perspective of a sliding seal manufacturer to explore the difficulties of the application of sliding seals: sliding seals in addition to withstand high sealing pressure, but also to withstand high sealing medium temperature, sometimes high viscosity medium or containing solid material medium. In addition, there are geometric requirements, such as with the strict installation space, screw pump accurate shaft spacing and so on.
At the same time, the four prerequisites for the efficient operation of the sliding seal ring are clarified:

1. Parallelism of the end face of the sliding surface;
2. The verticality between the sealing surface and the rotary axis;
3. Elastic contact of sealing surface;
4. Lubricating oil film between sealing surfaces.
 
A good lubricating oil film formed between the sealing surfaces can reduce the contact of the sliding surfaces and reduce friction, but it also has a large sealing leakage problem. In the real sliding seal, the seal leakage and sealing surface wear are generally compromised. However, this compromise can be broken under certain circumstances. By purposeful design of the molding structure on the sliding surface-the LaserFace structure, we can significantly improve the hydrodynamic lubrication performance of the sealing lip of the sliding sealing ring, and at the same time Reduce the seal leakage. Practical applications of many users have confirmed this.
How does the LaserFase structure function? This involves considering the design of grooves in the sealing surface. The oil supply groove in the sealing ring can generate a large hydrodynamic pressure. Under the action of this pressure, a stable lubricating oil film with strong adhesion can be generated on the contact surface to separate the contact surface.
 
The oil return groove guides the lubricated lubricating oil back to the inside of the equipment, thus greatly reducing the seal leakage of the seal. The biggest advantage of this technology is that it has a longer service life than GLRD type sealing ring when used in media with "volatile and escape" performance. The potential of this technology is to greatly increase the service life of sliding seals.
 
However, this technology is also subject to certain restrictions in use: at present, this technology can only be used in clean medium sealing, if the sealed medium contains more solid substances, the use of this seal will be limited. The boiling point temperature of the sealed liquid medium is -268.15 ~-270.15 ℃.
 
Silicon Carbide: Suitable Material Selection In general, the material of the sliding seal is usually silicon carbide (SiC). Compared with the material combination of cemented carbide-carbon, or cemented carbide-cemented carbide in contact with each other, the material combination of silicon carbide-silicon carbide has better corrosion resistance and corrosion resistance. Even so, the user of the pump must have a little "sacrifice spirit" and make some concessions and compromises: in the case of dry friction of oil loss for a short time, the performance of the silicon carbide material seal is not good; moreover, the use of this material seal in hot water medium is limited.

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