Due to the presence of an oil film controlled by the oil seal edge between the oil seal and the shaft, the oil film has fluid lubricating properties. Under the action of the surface tension of the liquid, the rigidity of the oil film just makes the oil film and the air contact end form a meniscus, which prevents the leakage of the working medium and thus realizes the sealing of the rotating shaft. The sealing ability of the oil seal depends on the thickness of the oil film on the sealing surface. If the thickness is too large, the oil seal will leak; if the thickness is too small, dry friction may occur, causing the oil seal and shaft to wear; if there is no oil film between the sealing lip and the shaft, it will easily cause heat and wear. Therefore, when installing, it is necessary to apply some oil on the sealing ring, and at the same time ensure that the skeleton oil seal is perpendicular to the axis line. If it is not perpendicular, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also lead to excessive sealing of the lip. wear. During operation, the lubricant in the casing seeps out a little, so that it is ideal to form an oil film on the sealing surface
The use of high-speed oil seals should also pay attention to the following points:
Some equipment is used in a harsh environment, such as extreme cold. At this time, the oil seal selected at this time should be made of a relatively cold-resistant material; or it is used outdoors, exposed to the sun and rain. Under the circumstance of oh even easy to aging, do you make a choice on the material or replace the oil seal frequently? These issues need to be considered when using high-speed oil seals.
Post time: Aug-29-2022