The sealing principle of the skeleton oil seal
Release Time：
2022-06-01
Sealing principle: Since there is an oil film controlled by the oil seal edge between the oil seal and the shaft, the oil film has fluid lubrication characteristics. surface tension in liquids Skeleton oil seal 骨架油封 的作用下，油膜的刚度恰好使油膜与空气接触端形成一个新月面，防止了工作介质的泄漏，从而实现旋转轴的密封。油封的密封能力，取决于密封面油膜的厚度，厚度过大，油封泄漏；厚度过小，可能发生干摩擦，引起油封和轴磨损；密封唇与轴之间没有油膜，则易引起发热、磨损。 因此，在安装时，必须在密封圈上涂些油，同时保证骨架油封与轴心线垂直，若不垂直，油封的密封唇会把润滑油从轴上排干，也会导致密封唇的过度磨损。在运转中，壳体内的润滑剂微微渗出一点，以达到在密封面处形成油膜的状态最为理想。
Sealing principle: Since there is an oil film controlled by the oil seal edge between the oil seal and the shaft, the oil film has fluid lubrication characteristics. Under the action of the liquid surface tension skeleton oil seal, the rigidity of the oil film just makes the contact end of the oil film and the air form a crescent surface, preventing the leakage of the working medium, thereby realizing 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 oil seal and shaft wear; if there is no oil film between the sealing lip and the shaft, it is easy to 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.
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