A graphite sealing structure with twill dynamic pressure groove

Abstract

The invention discloses a graphite sealing structure with oblique dynamic pressure grooves, relates to the field of sealing of engine bearing chambers, and is particularly suitable for efficient sealing of lubricating oil in the bearing chambers of aeroengines. The structure is mainly to open an annular inner groove on the inner peripheral surface of the graphite sealing ring. The annular inner groove divides the inner peripheral surface of the graphite sealing ring into a main sealing surface and a secondary sealing surface. It is a twill dynamic pressure groove that communicates with the outside and the inner end communicates with the annular inner groove. When the rotor runs at high speed, pressure can be generated in the twill dynamic pressure groove, which improves the sealing performance of the graphite seal; at the same time, the twill dynamic pressure groove reduces the contact area between the graphite seal ring and the sealing track, weakens wear, and is conducive to improving the performance of the graphite seal. The life of the graphite seal; in addition, the friction power consumption and friction heat are reduced, the running line speed can be increased, and the use boundary of the graphite seal can be broadened. The invention has simple structure and convenient processing, and is a sealing structure with great application prospects.

Description

technical field [0001] The invention belongs to the field of sealing of engine bearing chambers, and relates to a graphite sealing structure with oblique dynamic pressure grooves, which is suitable for sealing such as aeroengine bearing chambers. This structure is a new type of sealing structure with twill dynamic pressure grooves on the inner circumferential surface of the graphite sealing ring to improve the sealing performance and extend the operating life, and can meet the sealing requirements of modern high-performance aeroengines for the 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 through the sealing technology. Studies have shown that every 1% reduction in seal leakage can increase engine thrust by 1% and redu...

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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 cause the seal to fail; again, because the graphite seal is a contact seal, the wear and tear will be serious in long-term operation, which will affect the service life of the graphite seal

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