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Rubber Sealing Technology
Rubber Sealing Technology
Rubber Sealing Technology Development Trends
First, high pressure, and high-speed, and to adapt to hightemperature, low temperature and harsh environment, such as sandand dust
With the mechanical products of the increasingly harsh conditionsof use of rubber seal products, the use of conditions put forwardhigher requirements, such as in aerospace, aviation industry, oiland mining industry, engineering machinery and transport industry,energy industry, such as the use of plastic seal , often have toadapt to a wide temperature environment and high pressure, sand anddust and other harsh environments. According to the InternationalRubber Conference 1984 data, automobiles, tractors in the ringrotation axis Lamiaceae conditions of use there has been asignificant development.
Because conditions of use changes, special rubber consumption willcontinuously increase in the development of new seals, sealsimprove the life and reliability.
Lamiaceae ring axis of rotation of the working pressure is usuallyin the 0.1 ~ 3.5MPa, the maximum speed of 15 ~ 20m / s. Hydrodynamic-type maximum speeds of up to 25 ~ 32m / s. However, in higher circumstances, a slightly lower number ofworking pressure.
Reciprocating dynamic sealing systems under the pressure of 20MPagenerally, in the aerospace, aviation industry combinations used inhigh-performance sealed system pressure up to 56MPa. At thispoint, the maximum operating speed of 1m / s.
As China's economic development has been proposed development inthe alpine, desert environment and underwater seals used in therequest.
Second, squeeze-type seal of the technology developmenttrends
Other factors, such as X-type, T type, D type, square, triangle,such as type, suitable for applications in differentoccasions.
Direction to improve its sealing performance is stable and reliablepressure to improve its ability to reduce friction. Can andlow-friction plastic such as PTFE, nylon slip ring and bearing sealring to form combinations. Enhance its resistance to reducethe pressure and friction. Some factories have reached thespeed of product licensing 7.5m / s, sealed pressure5.6MPa.
Three, reciprocating dynamic sealing lip of technology developmenttrends
Reciprocating dynamic sealing lip liner or lip, also knownas皮碗quite widely used in the hydraulic system of the reciprocatingdynamic sealing fuel tanks. This sealing lip surface pressurein the installation has been a very small surplus, so that geo-lipsealing surface with full contact seals have a role. When the fueltank work, as the pressure increased, the contact force and contactarea increase, thus improve sealing. Return in the fuel tank, thepressure on long low contact area and friction are lower than thework trip, resulting in respiration, lubrication lip.
Dynamic Sealing type reciprocating many have a common J-, L-type, Utype, V-and Y-type and so on. There are various combinationsand sealing compound. Such as the Peng-shaped, bud-shaped,multi-lip seals.
Under high pressure of the need to prevent extrusion, selected withenough anti-tear strength, hardness and modulus. Or with aring bearing protection, or the use of enhanced elastomers. Some high-pressure, high-speed or high temperature sealing is oftenused in the use of composite modular sealed如霞board company(Shamban) the company's "Turcon" slip-ring seal combination, Karl•弗伦登Fort Oil Corporation and Japan's "NCF" , "SIMKO" efficientportfolio sealed Doughty's Balmaster, such as Hall'sHallprone.
Their common feature is the two have lip contact with the fuel tankwall. Seals between parts has a groove, you can store media,improved lubricity, lip loss of small, reliable sealing, and forthe pneumatic system of the lip seal requires no lubrication stateoil job, and the hydraulic system lip seal structure isdifferent. At present, most of them used in the sealing lipwith grease stored in the lip of the trough or adhesive has lowfriction plastic or cloth structures to improve their life, andsome structural ideas from the lower lip of the seal contact areaand contact pressure, Some will be dust-proof seals made scraperwith integrated structure.
Fourth, rotation axis Lamiaceae Sealing Technology DevelopmentTrends
At present, similar structures have been no fewer than 200 kinds ofvarieties. Such as the hydrodynamic type, within the packetframe, assembly-style, exposed frame, the AF-type PTFE adhesive,dual-mode volume of return type and so on. Exposed skeletonfabricated the advantages of accurate positioning. Coaxialityhigh thermal conductivity of thermal conditions.
In under pressure and vibration stability, and thus have a higherlife, while saving rubber. Dual-mode use of the volume ofreflux-type waveform sealed theory, through an increase in sealingcontact with parts of a low-set stretch, easily deformed material,you can get back to the effect, at the same time can reduce productdesign and mold processing costs.