A guide blocking sealing structure for the rear bearing cavity of a high pressure turbine disk

Abstract

The invention discloses a flow-guiding and blocking sealing structure for a bearing cavity behind a high-pressure turbine disc, wherein a sealing seat is used for sealing the bearing cavity behind a high-pressure turbine disc; the sealing seat has discrete flow passages to ensure the introduction of low-temperature gas , circulation; with a ring-shaped air-guiding cavity, which realizes the diversion of low-temperature gas and the blocking of high-temperature gas, ensuring that the gas entering the bearing cavity behind the high-pressure turbine disc is low-temperature gas; it has wear-resistant coatings such as graphite and silver copper, and when sealed When the stator is scraped, no high temperature will be generated, and the scraped and dropped materials will be softened materials such as graphite or silver copper. Even if it enters the bearing cavity, the bearing will not be damaged; it has a sunken groove structure, without occupying space. Realize the fixation of the sealing seat and the load-bearing casing; it has discrete bosses to ensure the axial positioning of the outer ring of the bearing while reducing weight.

Description

technical field [0001] The invention belongs to the technical field of air systems of ground gas turbines and aero-engines, and relates to a sealing structure, in particular to a sealing structure with diversion and blocking function for the bearing cavity behind the high-pressure turbine disc, through which the high-pressure turbine disc and its rear fulcrum A sealing seat with diversion and blocking effect is set between them to guide the introduction of low-temperature gas and block the high-temperature gas, so as to ensure that the gas entering the turbine rear fulcrum bearing chamber is always low-temperature gas. Background technique [0002] Gas turbines / aeroengines have the characteristics of high temperature and high speed, and their rotor bearings bear high radial and axial loads. The bearings must be lubricated and cooled by spraying lubricating oil to ensure their normal operation. In addition to the heat generated by the bearing under high load and high speed, t...

AI Technical Summary

Problems solved by technology

If this air flow leaks into the bearing cavity, it will bring great risk to the normal operation of the bearing. Therefore, it is necessary to introduce lower temperature gas from the low pressure stage of the compressor to wrap the bearing cavity

Images