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Classification of sealing strip by use

Classification of sealing strip by use

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Seals can be divided into two categories: static seal and dynamic seal.Static sealStatic seals are mainly gasket seal, sealant sealing and direct contact sealing three categories. According to the work pressure, static seal can be divided into medium and low pressure static seal and high pressure static seal. Low and medium pressure static seals are usually made of soft and wide width gasket. High pressure and static seals are made of hard material and metal gaskets with narrow width.Dynamic sealDynamic seals can be divided into rotary seal and reciprocating seal two basic types.OtherAccording to the seal of the relative movement of the parts is divided into sealing contact, contact and non-contact seal; according to the seal and the contact position can be divided into circumferential seal and the seal, the seal is also called mechanical seal. The centrifugal seal and spiral seal in the dynamic seal are sealed by the power of the medium when the machine is running, so it is sometimes called the power seal.According to the type of sealing structure, sealing mechanism, seal shape and material, the seal can be classified according to table 29.2-1.
Y ring seals, piston seals, sometimes static sealsMechanical seals, pumps, turbines, high pressure vessels, compressors, agitation. A combination of different materials, including metal bellows seals, can be usedThe oil seal is sealed or sealed with other seals, and dustproofSplit slip ring seal, hydraulic turbine, steam turbine, multipurpose graphite, slip ringLabyrinth seal steam turbine, pump, compressor reciprocating, should be high speed, low speed do not useFloating ring seal pump and compressorCentrifugal seal and screw seal pumpThe magnetic fluid sealed compressor is only used in gas mediumTable 29.2-3 types and applications of dynamic sealsVacuum pressure (absolute pressure) /MPa (g) /MPa / C working temperature line speed of /m - S-1 / M - H-1 leakage rate using the term applicationPacking sealing 1.33 * 10-3, 31.38 -240 ~ 6002010~1000 - clean centrifugal pump, plunger pump, valve stem sealContact forming packing, extrusion type, 1.33 * 10-7, 98.07 -45 ~ 230100.001 ~ 1 ~ 0.16 months hydraulic cylinder, hydraulic cylinderLip type 1.33 x 10-9 0.1 to 10Rubber oil seal - 0.29 -30 ~ 150123~6 months bearing sealing and dust-proof
Table 29.2-1 classification of sealsThe basic requirements of the seal is the sealing is good, safe and reliable, long service life, should be compact in structure, simple system, convenient maintenance, low cost, most of the seal parts, should ensure interchangeability, realize standardization and seriation.Various types of by sealing group leader have their characteristics and scope of use, the design of sealing should first be analyzed and compared.Table 29.2-2 lists the characteristics of a variety of commonly used sealing methods. Table 29.2-3 is the type and range of applications of dynamic seals.Sealing type, reciprocating motion, rotation, pressure resistance, high speed resistance, heat resistance, cold resistance, durability, remarksPacking seal pump, turbine, valve, autoclave. Available for filament packing, textile packing, or molding.O - ring seal piston seals are widely used as static seals, with good durability at this time.

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