Bearing seal you know that there are a few? In the use of different places to how to choose a seal?

In the rolling bearing two ends, device will have corresponding seal installation. With dust cover with sealing ring, two performance is different, one is dustproof, one is the seal. Sealing is insist on bearing internal smooth fat ( Oil) In use does not leak, the outside is not clean grease is also not easy to flow into, to ensure bearing in the smooth state; Dust is to maintain dust or harmful gas bearing outside will not enter the bearing inner cavity, in case of bearing formation damage. Open, plastic cover seal, no seal, iron cover sealed bearing bearing assembly seal installation is in recent years, the past bearing are open, in order to guarantee the smooth of the bearing and dustproof, seal installation is located in the bearings on both ends of the shaft. With the development of the industry, food industry, in particular, the improvement of modern office machinery and electrical appliances, request equipment design is compact, the weight to avoid four rolling bearing non-contact seal leakage, leakage, it's presented bearing itself bearing with seal installation. Common seal with a rubber or engineering plastic, also have a steel plate punch the sealing ring ( Or dust cover) 。 The sealing ring seal structure is varied, the sealing effect is different also. There is gap between seal ring and the rotation, said non-contact seal, the smaller the gap, the better sealing effect, but allow the speed of the shaft is smaller; Instead. Sealing ring with no clearance between shaft, said contact seal, seal lip contact contact area is larger, the better sealing effect, but interface xu shaft speed is smaller, on the contrary. Rubber seal bearing dustproof and seal how said: dustproof expressed in Z, sealing with S ( Felt ring seal with FS said; LS in rubber seal) 。 Dust cover ZZ: retaining ring type dust cover plate bearing, miniature bearing, stamping processing of metal plate with a spring ring is fixed on the outer ring structure. 2 z: stamping steel plate bearing dust cover, reduce grease exudation, the metal steel plate by stamping processing reinforcement on the outer ring structure. Sealing ring TT: retaining ring type teflon bearing seals, mainly for the miniature bearing, put in glass fiber teflon sealing ring with a spring ring is fixed on the outer ring structure. 2 rs: touch rubber bearing sealing ring, effectively prevent the invasion of the external foreign body, the rubber sealing ring embedded bearing outer ring, sealing ring in contact with the inner ring slightly. In more detail on the basis of bearing in different environments, the use of the materials used in the dust cover and seal is not the same. The following simple introduced several kinds of materials used in the dust cover and seal. 1, bearing dust cover data bearing dust cover specification is cold rolled galvanized tin plate, sometimes the use of ASI 300 specifications of the stainless steel. 2, bearing the seal bearing seal main using NBR as data, in view of the high temperature environment, fluorine rubber and silicone rubber is widely used. (1) silicone rubber: MQ/PMQ/VMQ/PVMP, temperature range: - 70 ~ 200 degrees Celsius; Hardness: 25 ~ 80; Features: resistance to high temperature and boring, high wear resistance, the sunshine and ozone aging resistance; Limitations: the poor appearance wear and crack resistance. (2) the hydrogenated ( Nitrile rubber) : HNBR/NEM, temperature range: - 35 to 165 degrees Celsius; Hardness: 50 ~ 90; Features: heat, high ductility, resistance to corrosion; Limitations: inappropriate ultra-low temperature conditions, prevent and chemical corrosion direct sun. (3) : fluorine rubber FKM/FPM, temperature range: - 28 ~ 200 degrees Celsius; Hardness: 50 ~ 95; Features: high temperature resistant, significant resistance to corrosive, for oil products have corrosion resistance; Restrictions: no suitable low temperature working condition. (4) pp Rubber: ACM Rubber, temperature range: - 18 to 175 degrees Celsius; Hardness: 40 ~ 90; Features: the hot oil, has the strong sunshine and ozone corrosion resist ability at the same time with strong crack resistance; Limitations: the waterproof performance is poor, not appropriate temperature working condition. Bearing with dust cover or seal associated with the use of bearing request. Dust cover is not in contact with the bearing inner ring, is a contact device. Sealing ring in contact with the bearing inner ring, is contact device. Therefore, dust cover bearing limit rotational speed is higher than the sealing ring of bearing, and seal bearing protection grade is higher than the dust cover, seal bearing the waterproof performance is good, seal bearing can better prevent oil outflow. Bearing seal is first and foremost in deep groove bearing enormous quantity wide application is more, in recent years, all kinds of rolling bearing with different sealing ring of the bearing. So sealed bearing is a technology to carry out one of the important direction of different bearing structure and application of different working conditions, request of sealing ring structure and different materials.