Centering and positioning structure for CMC gas turbine outer ring

Abstract

The invention discloses a centering and positioning structure for a CMC gas turbine outer ring, and relates to the technical field of turbine engines. The centering and positioning structure comprises the CMC turbine outer ring, flexible connecting structures and positioning pins, wherein the whole CMC turbine outer ring is suitable for being assembled in a turbine casing; each flexible connecting structure is used for connecting the turbine casing and the CMC turbine outer ring, one end of each flexible connecting structure is fixedly connected with the turbine casing, and the other end of each flexible connecting structure abuts against the CMC turbine outer ring; and the positioning pins penetrate through the turbine casing and the flexible connecting structures as a whole, and the lower ends of the positioning pins are connected with the CMC turbine outer ring. According to the centering and positioning structure, through the application of arched elastic sheets and the positioning pins, centering and positioning requirements of the CMC turbine outer ring in a small space can be met; and meanwhile, the elastic sheets are impacted and cooled through a plurality of impact holes, so that the elastic sheets can normally work in a high-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of turbine engines, in particular to a centering and positioning structure for an outer ring of a CMC gas turbine. Background technique [0002] As aero-engines put forward higher and higher requirements for performance parameters, the temperature before the turbine is also increasing. Turbine blades, stator blades, outer rings and other components that are in direct contact with high-temperature gas face severe challenges. The outer ring of the gas turbine is a special stationary part. In addition to being directly eroded by the gas, it is also necessary to ensure its centering and positioning in such a harsh environment, and to have a suitable tip clearance between the turbine blades, which requires its resistance to Strong temperature capability, uniform thermal expansion and reliability of the connection structure. [0003] At present, the outer ring of the gas turbine is generally made of high-tempera...

AI Technical Summary

Problems solved by technology

[0004] In the existing technical solutions, the centering and positioning of the outer ring of the turbine depends on the ring groove of the casing, and the outer ring is a segmented structure, there must be gaps in the circumferential direction, and the heating will inevitably lead to uneven expansion, which cannot guarantee the turbine blades. Uniformity of tip clearance, thereby reducing turbine work efficiency

The outside of the outer ring of the turbine needs to introduce a large amount of cold air from the air system for cooling, which will undoubtedly have an adverse effect on the power of the engine

Moreover, according to the existing design experience, the temperature outside the outer ring of the gas turbine can reach above 1000K, and the space is limited, so the volume of the designed spring must be limited. The radial displacement of the outer ring affects the safety of the engine operation

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