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Structural characteristics and classification of contact packing seals

Release time:

2019-04-26 12:30

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Structural characteristics and classification of contact packing seals
What is packing seal 1. packing seal structure? Packing seal is also known as compression fill Gland Packings seal, commonly known as packing Packings seal.
Packing seal is a contact seal, that is, an elastic sealing material is filled between the shaft and the shell. When the packing is compressed by axial force, it can be tightly attached to the shaft surface. The elastic deformation of the sealing material is used to compensate for the wear of the sealing surface. The sealed space is isolated from the outside world, blocking the leakage gap and preventing the leakage of the medium.
Features of 2. packing seals 1. Gland seals are wrapped around packing (oil-soaked asbestos, cloth-like glue, lead wire metal braid, etc.) in the gap between the shaft and the shell to achieve sealing by pressing it with glands and screws.
2. The molded seal (like glue, plastic, etc.) is placed in the ring groove of the sealed surface, with low friction and low cost.
3. packing seal classification conditions (soft packing seal and hard packing seal) Soft packing seal has the advantages of simple structure, convenient disassembly and assembly, and low cost, but the packing wears quickly, and it is necessary to tighten the gland, adjust the bolts, and replace the packing more frequently.
Its scope of application is: medium pressure from vacuum 1.3千帕 to 35 MPa, working temperature -50~600 degrees Celsius, sealing surface line speed of 20 m/s. It is usually used as a seal for rotating or reciprocating equipment. Hard packing seal with high pressure, high temperature, high speed performance, to be used for compressor, plunger pump and other equipment dynamic seal.

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