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The principle of sealing of skeleton oil seal
There is an oil film controlled by the oil seal blade port between the oil seal and the shaft. This oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil membrane just makes the oil membrane and the air contact end form a new moon surface, preventing the leakage of the working medium, thereby achieving a sealing of the rotation axis.
The sealing ability of the oil seal under Simple maintenance china oil seal design depends on the thickness of the sealing cover, if it is too large, the oil seal will leak oil; if the thickness is too small, it may cause dry friction, which may cause damage to the oil seal and the shaft.
Therefore, during installation, some oils must be applied on the sealing ring, and the skeleton oil seal is vertical and the axis heart line is perpendicular. Damage. During the operation, the lubricant in the shell is slightly exuded to achieve the most ideal state of forming an oil film on the cover.
The main effect of the skeleton oil seal is (1) preventing the bearing from external invasion of sediment, dust, water and other external invasion;
When the oil seal is installed on the mechanical, oil leakage may occur, and the cause of oil leakage is likely to be caused by the problem of oil seal. So how can there be several possibilities that cause the equipment to be sealed and leak?
1. Poor lips -poor manufacturing quality -burrs or defects in the mouth of the lips -removing burrs or replacing oil seals
2. Poor quality or failure of spring -manufacturing quality -replace the spring
3. Little radial pressure -springs are too loose, and the radial gap is too large -adjusting the spring
4. There are scars on the lips -when assembly, the oil seal passes through the key mouth or thread -replacing the oil seal, and when installation, light in the correct installation;
5. Deformation of oil seal -incorrect installation -replace oil seal and correct installation;
6. Flip or fall off the mouth of the lip -the axis end is not enough, and the force is too large during installation -processing the backward angle, applying a small amount of fat, and correctly installation.
The following points should be paid attention to using oil sealing reasonably:
(1) High -speed oil seal with high rotation shafts, low -speed shafts use low -speed oil seals, and low -speed oil sealing cannot be used on high -speed axis, otherwise
(2) When the environmental temperature is high, polypropylene or silicon, fluorine, and silicon fluorine rubber should be selected, and the oil temperature in the fuel tank should be reduced. rubber;
(3) Under the conditions of excessive pressure, the resistance oil seal of the resistance of voltage resistance should be adopted;
(4) Correctly installed skeleton oil seal. When the oil seal and shaft are too eccentric, the sealing properties will become worse, especially when the axis speed is high. If the eccentric is too large, you can use the “W” shaped oil seal;
(5) The surface of the axis directly affects the service life of the oil seal, that is, the smoothness of the axis, and the service life of the oil seal;
(6) Note that there should be a certain amount of lubricating oil at the mouth of the lip of the oil seal;
(7) Pay special attention to prevent dust from being immersed in oil seal.
