A graphite sealing structure with anti-herringbone dynamic pressure groove

Abstract

The invention discloses a graphite sealing structure with an anti-herringbone dynamic pressure groove, relates to the field of engine bearing cavity sealing, and is particularly suitable for high-efficiency sealing of lubricating oil in the bearing cavity of an aeroengine. The structure is mainly to open an annular inner groove on the inner peripheral surface of the graphite sealing ring, and the annular inner groove divides the inner peripheral surface of the graphite sealing ring into a main sealing surface and a secondary sealing surface, and one side of the secondary sealing surface communicates with the outside of the bearing cavity , The anti-herringbone dynamic pressure groove connected to the annular inner groove on the other side. When the rotor runs at high speed, pressure can be generated in the anti-herringbone dynamic pressure groove to improve the sealing performance of the graphite seal; at the same time, the anti-herringbone dynamic pressure groove reduces the contact area between the graphite sealing ring and the sealing track, reducing Frictional power consumption and frictional heat are conducive to improving the life of graphite seals; in addition, it can increase the operating line speed and broaden the use boundary of graphite seals. 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 anti-herringbone dynamic pressure grooves, which is suitable for sealing such as aeroengine bearing chambers. The structure is to set an annular inner groove on the inner peripheral surface of the graphite sealing ring, and the annular inner groove divides the inner peripheral surface of the graphite sealing ring into a main sealing surface and a secondary sealing surface, and an anti-herringbone dynamic pressure groove is set on the secondary sealing surface , a new type of sealing structure used to improve the sealing performance and prolong the operating life, which can meet the sealing requirements of the lubricating oil in the bearing cavity, such as modern high-performance aeroengines. Background technique [0002] For modern high-performance aero-engines, in order to pursue higher thrust-to-weight ratio and thermal efficienc...

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 cause the seal to fail; again, because the graphite seal is a contact seal, its frictional power consumption is large, the frictional heat is high, and the wear and tear of long-term operation is serious, which affects the service life of the graphite seal.

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