Gas collection and drainage structure for cooling inner cavity of stator blade

Abstract

The invention belongs to the field of aero-engine stator blades, and particularly relates to a gas collection and drainage structure for cooling an inner cavity of a stator blade. The gas collection and drainage structure comprises a casing, an air entraining pipe, a rear baffle ring, an air collecting ring and the stator blade, wherein an installation hole is formed in a casing barrel, a front hook is installed on the front installation edge of the casing, and the air entraining pipe is installed in the installation hole of the casing; the rear baffle ring is mounted on the rear mounting edge; the gas collecting ring sleeves the inner side of the casing, the front end of the gas collecting ring is connected with the front hook through a first sealing ring, the rear end of the gas collecting ring is connected with the rear baffle ring through a second sealing ring, and a first gas guide port is formed in the gas collecting ring; the stator blade sleeves the inner side of the gas collecting ring, the front end of an upper edge plate of the stator blade is connected with the front hook, the rear end of the upper edge plate is connected with the rear baffle ring, and a second air entraining opening is formed in the upper edge plate of the stator blade and communicated with the first air entraining opening through a cold air connecting nozzle; and a gas collecting cavity is formedbetween the casing and the upper edge plate of the stator blade. The gas collection and drainage structure is good in structural leakproofness and structural coordination.

Description

Technical field[0001]The application belongs to the field of aero-engine stator blades, and particularly relates to an air collecting and drainage structure for cooling the inner cavity of the stator blade.Background technique[0002]The turbine stator blades of aero-engines are in high-temperature gas. In order to ensure their safe operation, they need to be cooled. In order to ensure reliable cooling, they need to ensure the stability of the air supply. Generally, a gas collection is formed between the blade edge plate and the casing. Cavity.[0003]At present, there are mainly two types of air-collecting structures for guide vanes. One is to directly form a cavity between the blade edge plate and the casing, and supply air to the stator blades after the air is collected. Because the blades are designed in circumferential segments, Although there are sealing pieces at the circumferential section, there are still problems of poor sealing and air leakage. At the same time, the blade edg...

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Problems solved by technology

[0003] At present, there are mainly two types of gas collection structures for guide vanes. One is to directly use the cavity formed between the blade edge plate and the casing to supply air to the stator blades after gas collection. Since the blades are designed in circumferential segments, Although there is a sealing sheet at the circumferential section, there are still problems of poor sealing and air leakage. At the same time, the temperature of the blade edge plate is relatively high, and it is relatively close to the casing, and the casing is vulnerable to radiant heat from the blade edge plate Affected, the temperature is higher, and the loss of heat at the same time is not conducive to the performance of the engine

The other is to use a double-layer casing. Although this can solve the problem of air leakage, it takes up a lot of structural space and costs a lot. At the same time, the temperature difference between the inner and outer layers of the casing is large, and there is a large thermal stress between the inner and outer casings. The problem of inconsistency with deformation

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