Graphite sealing structure with reverse-fishbone-shaped dynamic pressure groove

Abstract

The invention discloses a graphite sealing structure with a reverse-fishbone-shaped dynamic pressure groove, and relates to the field of engine bearing cavity sealing. The graphite sealing structure is particularly suitable for high-efficiency sealing of lubricating oil in an aircraft engine bearing cavity and the like. The structure is mainly characterized in that an annular inner groove is formed in the inner circumferential surface of a graphite sealing ring, the inner circumferential surface of the graphite sealing ring is divided into a main sealing surface and an auxiliary sealing surface by the annular inner groove, and the auxiliary sealing surface is provided with the reverse-fishbone-shaped dynamic pressure groove with one side communicating with the outside of the bearing cavityand the outer side communicating with the annular inner groove. When a rotor operates at a high speed, pressure can be generated in the reverse-fishbone-shaped dynamic pressure groove, and the sealing performance of the graphite seal is improved; meanwhile, the reverse-fishbone-shaped dynamic pressure groove is formed, so that the contact area of the graphite sealing ring and a sealing runway isreduced, the friction power consumption and the friction heat are reduced, and the service life of the graphite seal is prolonged; and in addition, the running linear speed can be improved, and the use boundary of the graphite seal can be widened. The sealing structure is simple in structure, convenient to machine and wide in application prospect.

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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