Packing seal has the characteristics of wide packing, easy processing, low price, reliable seal, simple operation and so on, so it has a wide range of application. In recent years, with the development of sealing packing, packing seal has been greatly improved in material, structure and various properties. Therefore, packing seal has been widely applied in machinery industry, and achieved good economic benefits.

The working mechanism of packing seal

In the machinery industry, the packing seal is mainly used as a dynamic seal. It is usually used as a shaft seal for centrifugal pumps, compressors, vacuum pumps and blenders. The choice of filler should be based on the working conditions of mechanical equipment. The selection of fillers should have the following conditions.

1. With a certain plasticity, a certain radial force can be generated and contact with the tight axis under the action of the compression force.

2, there is enough chemical stability, no pollution media, fillers are not bulging by the medium, the impregnant in the packing is not dissolved by the medium, and the filler itself does not corrode the sealing surface.

3. The self lubrication performance of the filler is good, and the friction coefficient is small. Health level self-priming pump

4, when there is a small amount of offset in the shaft, the filler should have enough floating elasticity.

5. Simple manufacturing and convenient filling

For this reason, it is necessary to adjust the packing degree of the packing regularly, so that the lubricant in the filler will run away for a period of time and then squeeze out some lubricants, and at the same time, compensate for the tightening force relaxation caused by the volume change of the filler. Of course, the packing is often squeezed, and the impregnating agent will be exhausted at the end, so it is necessary to replace the packing regularly. In addition, in order to maintain the liquid film and take away the friction heat, it is also necessary to have a small amount of leakage at the packing.

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