The role of rolling bearing seals and the types of common seals
A, the role of rolling bearing sealing device
1、Protect the bearing
Prevent the external dust, dirt, metal particles, moisture, acid gas and other debris invasion bearing internal. If the bearing seal is not good, the external debris invasion, so that the working condition of the bearing is significantly worse, the service life of the bearing will be significantly reduced.
2、Prevent the leakage of lubricating oil and grease
If the oil leakage, it will quickly destroy the normal lubrication of the bearing and make the bearing burn out due to heat. In addition, poor sealing device not only leaks oil to cause waste, but also will pollute the machinery and equipment and processed products. Therefore, to make the normal operation of the machine, the bearing should have a good sealing device.
Second, the type of rolling bearing sealing device
1、Non-contact seal
Non-contact seal non-contact seal is the seal and its relative moving parts do not contact, and there is an appropriate gap between the seal. This form of seal, in the work of almost no frictional heat, no wear, especially for high-speed and high-temperature occasions. Non-contact seals are commonly used in various structural forms such as gap, labyrinth and gasket, which are used in different applications. The clearance of non-contact seals is as small as possible.
2、Contact seal
Contact seal contact seal is the seal and its relative moving parts in contact and no gap seal. This seal is in direct contact with the mating parts due to the seal, in the work of friction, heat generation is also large, easy to cause poor lubrication, easy to contact surface wear, resulting in sealing effect and performance degradation. Therefore, it is only suitable for medium and low speed working conditions. Contact seal commonly used are felt seal, leather bowl seal and other structural forms, applied to different occasions. According to the working conditions of bearings and the requirements of the working environment on the degree of sealing, the engineering design is often a combination of various forms of seals to achieve better sealing effect.
3、Integrated seal
In the dust, moisture and other harsh environment, as well as in the case of lubricant leakage is not allowed, often a combination of various forms of seals to achieve better sealing effect.
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