骨架油封的装配及注意事项（Assembly and matters needing attention of skeleton oil seal）.docVIP

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骨架油封的装配及注意事项（Assembly and matters needing attention of skeleton oil seal）.doc

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骨架油封的装配及注意事项（Assembly and matters needing attention of skeleton oil seal）

骨架油封的装配及注意事项（Assembly and matters needing attention of skeleton oil seal） The skeleton oil seal assembly and the matters needing attention A structure, skeleton oil seal: seal structure is relatively simple, generally is composed of three parts: seal body, strengthen the skeleton and self tightening spiral spring. The sealing body according to the different parts are divided into bottom, waist, edge and lip seal etc.. Usually, the skeleton oil seal in the free state, its size is smaller than the diameter shaft, with the surplus amount . Therefore, when the oil encapsulated into the oil seal seat and shaft, seal edge pressure and self tightening spiral spring contraction force radial tightening force on the shaft, after a period of time after the operation, the pressure decreases rapidly and disappears, therefore, plus spring can seal the self tightening force compensation. Two, sealing principle: 1. free state, the seal lip diameter smaller than the diameter of the shaft, with a certain amount of interference. 2. after installation, over pressure and self locking spring contraction seal blade radial pressure generated on the rotating shaft. 3., the seal lip in the radial pressure, the formation of 0.25 ~ 0.5mm wide sealing contact zone. The lubricating oil pressure, oil permeability a layer of very thin film formed between seal edge and the rotating shaft. The oil film by the surface tension of the oil, the formation of a new moon in the shaft and the oil seal edge edge to prevent oil spills, plays a role in sealing. Between the seal and the shaft there is oil film seal edge control, this film has the lubrication characteristics. The surface tension of the liquid under the action of the oil film stiffness of the oil film is in contact with the air end forming a new moon, in order to prevent leakage of working medium, so as to realize the sealing of rotating shaft. The sealing ability of the oil seal, the sealing surface depends on the thickness of oil film thickness