Mechanical packing industry should have five basic points
Stuffing seals in the machinery industry are mainly used as dynamic seals. Commonly used as centrifugal pumps, compressors, vacuum pumps, rotary shaft seal mixer, seal packing design choice should be based on the work of mechanical equipment
Stuffing seals in the machinery industry are mainly used as dynamic seals. Commonly used for centrifugal pumps, compressors, vacuum pumps, rotary shaft seal mixer, seal design in the choice of the mechanical equipment should be the working conditions as the main consideration, the choice of filler should consider the following conditions:
1, a certain degree of plasticity, under the action of compression can produce a certain radial force and contact with the close axis.
2, have sufficient chemical stability, do not pollute the medium, the filler is not swelled by the medium, the impregnating agent in the filler is not dissolved by the medium, and the filler itself does not corrode the sealing surface.
3, filler self-lubricating performance is good, wear-resistant, small friction coefficient.
4, the shaft there is a small amount of offset, the filler should have sufficient floating flexibility.
5, easy to manufacture, easy to fill.
For this reason, it is necessary to adjust the degree of packing of the packing frequently so that the lubricant in the packing runs out for a period of time, and then some lubricant is squeezed out, at the same time, the packing pressure is relaxed due to the volume change . Of course, this often squeeze the filler, the impregnator will eventually dry up, so regular replacement of the filler is necessary. In addition, in order to maintain the liquid film and take away the frictional heat, it is necessary to deliberately allow a small amount of leakage at the packing.