Bearing cavity non-contact trend graphite sealing structure

Abstract

The invention discloses a bearing cavity non-contact trend graphite sealing structure and relates to the field of engine bearing cavity sealing. The bearing cavity non-contact trend graphite sealing structure is especially suitable for efficient sealing of aero-engine bearing cavity grease. Specific to the defects of high friction consumed work and friction heat, low working linear speed and the like of contact type graphite sealing, a reversed fishbone-shaped dynamic pressure groove is formed in the inner circumferential face of a graphite sealing ring, a fishbone-shaped dynamic pressure groove is formed in the outer circumferential face of a sealing runway, through the improved graphite structure, the contact area of a rotor and a stator is reduced, graphite sealing has a trend to a non-contact effect on the basis that sealing performance is improved, operation life is prolonged, and the use edge is expanded. A method is simple and clear and is easy to achieve, and the bearing cavitynon-contact trend graphite sealing structure has high application prospects.

Description

technical field [0001] The invention belongs to the field of sealing of bearing chambers, and relates to a non-contact graphite sealing structure suitable for bearing chambers of aircraft engines and the like. In this structure, an anti-herringbone dynamic pressure groove is set on the inner peripheral surface of the graphite sealing ring pair seal and a herringbone dynamic pressure groove is set on the outer peripheral surface of the sealing track. While improving the sealing performance, by reducing the contact area, Increase the supporting force to make the graphite seal tend to be non-contact, and meet the sealing requirements of modern high-performance aero-engines for lubricating oil in the bearing chamber. Background technique [0002] For modern high-performance aero-engines, in order to pursue higher thrust-to-weight ratio and thermal efficiency, reduce fuel consumption rate, control pollutant emissions and improve working life, it is necessary to continuously break...

AI Technical Summary

Problems solved by technology

[0003] First of all, limited by the performance requirements such as the allowable temperature and material hardness of the material, the working range of the graphite seal is limited, and its operating linear speed generally does not exceed 150m / s; secondly, the main sealing surface of the graphite seal is generally small in size. , if it is damaged, it will easily lead to seal failure; again, because the graphite seal is a contact seal, the size of its secondary sealing surface is large, resulting in high frictional power consumption and frictional heat, severe wear, and its service life is generally lower than that of the non-contact seal structure.

[0004] In view of the above-mentioned shortcomings caused by contact, the present invention proposes a non-contact design method for graphite seals, and uses this method to improve the graphite seal structure. The overall structure is relatively simple, and the processing difficulty is the same as that of traditional seal structures, but the seal performance And operating life has been greatly improved, has a wide range of application prospects

Images