Sealing structure capable of achieving bearing cavity-sharing and bearing external cavity pressure equalizing

Abstract

The invention relates to a sealing structure capable of achieving bearing cavity-sharing and bearing external cavity pressure equalizing. The sealing structure is provided with front and rear bearing supporting points, one of the bearing supporting points is designed by adopting a simple supporting structure, the other one of the bearing supporting points is designed by adopting a cantilever supporting structure, so that two adjacent bearings are close in space, a front bearing seat and a rear bearing seat are connected together, the cavity-sharing design between the adjacent bearings is achieved, and thus pressure in a bearing cavity is convenient to adjust. A plurality of air hole structures are arranged on the front bearing seat and the rear bearing seat in the circumferential direction correspondingly, the angular positions, the shapes and the sizes of the air hole structures on the two bearing seats are mutually matched, and the air hole structures on the two bearing seats correspond one to one, channels communicating with two bearing external cavities are formed, and therefore pressure equalizing of the front bearing external cavity and the rear bearing external cavity is achieved; flow path of an air system is simplified, the design difficulty of the air system sealing the bearing cavity is reduced, and moreover the reliability of operating is high; and pressure of the bearing external cavities is adjusted by adjusting comb tooth gaps of inlet-outlet ports, build-up of the pressure of the bearing external cavities is facilitated, and the sealing effect is enhanced.

Description

technical field [0001] The invention relates to the field of ground gas turbines and aeroengines, and in particular to a sealing structure capable of realizing pressure equalization in the bearing common cavity and the bearing outer cavity, adopting a new structure and layout concept to realize the engine bearing common cavity and the pressure balance in the bearing outer cavity, Thereby improving the sealing effect of the bearing cavity and improving the safety of the engine. Background technique [0002] In ground gas turbines and aero engines, bearings are one of the essential key components of the engine. They mainly support other parts of the engine and bear a certain axial force. During this process, lubricating the bearing is the most basic and most important link to ensure the safe and reliable operation of the bearing. Lubricating oil can reduce the friction and wear of the bearing, take away the heat and wear impurities generated by the friction surface and ensure...

AI Technical Summary

Problems solved by technology

In the previous engine structure, although designers tried to achieve effective balance and control of the pressure outside the bearing cavity through different structures or design methods, on the one hand, it was limited by the bearing layout, on the other hand, due to the complex structure, the air The system flow path is too long, resulting in unsatisfactory actual operation

Images