Reasons for seal failure of imported bearing seats and improvement plans

FAG imported bearing seat seal improvement plan "multi-stage pressure relief sealing technology" experimental bearing seat seal ring, and can reduce the leakage of lubricating oil by reducing the pressure difference between the two ends of the seal in the working environment without the need for large-scale disassembly such as shaft extraction , At the same time, the remaining leaked lubricating oil flows back to the oil tank to achieve the purpose of preventing leakage of the shaft seal. Specific main technical indicators: "Multi-stage pressure relief sealing technology" experimental bearing seat seal ring can be replaced without dismantling the main shaft in situ, and there is no abnormal leakage of lubricating oil within a two-year period of normal operation. The specific research content is as follows.

Research on sealing material selection and sealing ring performance optimization

Aiming at the working conditions of the ship and the external environment and the existing shortage of the zero-diameter sealing rubber ring, a new sealing rubber ring that is more suitable for the middle bearing seat of the stern shaft of the ship is selected or developed. The research on the matching of sealing materials mainly adopts the method of experimental research. Select several groups of materials with good elasticity, aging resistance and wear resistance to make sealing rubber rings with wear self-compensation function and reasonable contact surface, and carry out targeted wear resistance and sealing performance tests, preferably suitable for the center of the ship stern shaft FAG imported bearing seat sealing rubber ring, sealing material technology is mainly based on the existing domestic mature technology, and based on this need to improve to meet the requirements. This is mainly due to the fact that this technology is a special technology that requires a long period of specialized research. The structure and force deformation research of the seal mainly adopts the finite element analysis method, which provides the basis for the structure design. Design analysis and experimental methods are used to reduce the pressure on the friction surface and reduce friction and wear. The research on anti-wear performance and life of seals is mainly based on experimental research methods. Through the experimental comparison of various sealing materials, the appropriate bearing seat sealing rubber ring is selected by adopting the method of step-by-step optimization. The choice of sealing sequence, material and additional equipment depends on different parameters. The pressure and temperature of the medium to be sealed as well as the diameter and the number of revolutions of the shaft to be sealed are important parameters for functional safety in the design. For evaluation, the pressure of the product and the roughness of the sealing surface are often used as evaluation values. Other marginal conditions include the installation environment, product characteristics such as chemical attack, caking tendency and solid parts. This plays a fundamental role in seal design for products or slurries with high solids content.