Rotor support structure and gas turbine

Abstract

The present invention relates to a support structure and a gas turbine comprising the same, wherein said support structure comprises a first support member comprising a first section for connection to a fan rotor bearing assembly and a second section for connection to a support frame; and connection means comprising a fuse part and an elastic assembly; wherein the adjacent ends of the first section and the second section are connected in parallel by the fuse part and the elastic assembly, and the elastic assembly allows When disconnected, it bears the load transmitted from the first section, and forms an elastic constraint between the fan rotor bearing assembly and the support frame. The above-mentioned support structure has the advantages of partial unloading when an FBO event occurs, preventing stress concentration, and easy design, and the above-mentioned gas turbine has the advantages of safety and reliability.

Description

technical field [0001] The invention belongs to the technical field of gas turbines, in particular to a rotor supporting structure and a gas turbine including the same. Background technique [0002] At present, the rotors of most civil turbofan engines are composed of high-pressure rotors and low-pressure rotors, and the low-pressure rotors pass through the high-pressure rotors and are supported to the stator casing by supporting structures. The low-pressure rotor generally consists of a fan, a booster stage and a shaft, usually supported by three bearings. A rotor support structure connecting the first bearing assembly and the second bearing assembly transfers loads generated in the fan section of the low pressure rotor to the support frame. [0003] During the operation of the turbofan engine, the large-size fan blades may break or fall off (FBO) due to factors such as bird strikes or fatigue. After the FBO incident, the low-pressure rotor still maintains a high speed, a...

AI Technical Summary

Problems solved by technology

However, releasing the radial constraint of the first bearing will cause the rotor to undergo radial oscillation deformation, easily damage the sealing ring of the bearing components, and cause the lubrication and cooling oil of the components to leak, which will easily lead to overheating and seizure of the bearing during rotation , causing the engine not to rotate normally

[0006] The second traditional fusing design scheme is to include the primary fusing of the supporting structure of the first bearing and the secondary fusing of the supporting structure of the second bearing, which will cause the supporting structures of the first bearing and the second bearing to be complicated

Moreover, it is required that the support structure of the second bearing cannot be completely fused, otherwise the high and low pressure rotors will be rubbed and the vibration of the windmill will increase during the rotation stage. Uncertainty in allocation, leading to difficulty in calculating the secondary fuse threshold

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