What are the sealing methods of bearings? What conditions apply?

The sealing of bearings can be divided into self-sealing and external sealing. The so-called bearing self-sealing is to make the bearing itself a device with sealing function. Such as bearings with dust covers, sealing rings, etc. This kind of seal takes up a lot of space. The so-called bearing external sealing function equipment is the sealing equipment with various functions made in the end cover of the equipment. External seal can be divided into non-contact type and contact type. Contact seal A contact seal is a seal that is in contact with a relatively moving part without a gap. Because the sealing and mating parts are in direct contact, there is a big conflict in operation, and the heat generation is also large, which is easy to form smoothness and wear, thus reducing the sealing effect and function. Therefore, it is only suitable for medium and low speed working conditions. Touch seal is often used in different occasions, such as felt seal and leather cup seal. Non-contact seal Non-contact seal is a kind of seal that does not contact parts that move relatively and has a proper gap. This sealing method is unique for high-speed and high-temperature occasions, with almost no conflict heat and wear during operation. Non-contact seals are often used in different arrangements, such as gap, labyrinth and gasket.