Gas seal assembly for axial positioning of turbine moving blade of gas turbine

Abstract

The invention discloses an air seal assembly for axial positioning of a turbine moving blade of a gas turbine, which comprises a moving blade, a blade profile, a blade root platform and a blade root, the blade root platform is arranged on the radial inner side of the blade profile, the blade root is arranged on the radial inner side of the blade root platform, the blade root platform is provided with a limiting groove positioned on the radial inner side, and the end face of the air outlet side of the blade root is provided with a limiting boss; blade root grooves are formed in the wheel disc; the tooth-shaped air seal is arranged on the air inlet side of the turbine; the pressing air seal is arranged on the air outlet side of the turbine and provided with a pressing section extending to the blade root groove, and a notch is formed in the radial outer side of the pressing section. The radial outer end of the sealing plate is located in the limiting groove, the radial inner end of the sealing plate is located in the notch, and the sealing plate is provided with a first groove for containing the limiting boss. According to the gas seal assembly for axial positioning of the turbine moving blade of the gas turbine, the size of the sealing plate is small, the centrifugal force in the rotating process is reduced, the service life of the turbine moving blade is prolonged, meanwhile, the manufacturing and maintenance cost can be reduced, and the mounting and dismounting workload of the moving blade is reduced.

Description

technical field [0001] The invention relates to a gas-encapsulating ligand for the axial positioning of a turbine blade of a gas turbine, belonging to the technical field of gas turbines. Background technique [0002] The turbine blade is axially installed in the blade root groove of the wheel disk through its blade root. The blade root forms of the turbine blade include T type, fir tree type and dovetail type, and the blade root groove in the wheel disk runs through the , in order to prevent the turbine blade from sliding in the blade root groove, the corresponding axial positioning structure of the turbine blade is required. [0003] Chinese patent application 201680052860.7 discloses a gas turbine device. The gas turbine device fixes the rotor blade axially on one side relative to the wheel through a locking plate. At the same time, the device further fixes the rotor blade relative to the wheel through another locking plate. Axially fixed on the other side. [0004] At ...

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Problems solved by technology

[0004] At present, in the prior art, the size of the sealing plate extending in the radial direction is large, and the centrifugal force of the sealing plate is large during the rotation process, so the turbine blades are subjected to a large centrifugal load during operation, which affects the service life of the turbine blades; The circumferential end of the sealing plate overlaps with each other in a stepped structure. This stepped structure makes the circumferential types of the sealing plate more diverse and cannot achieve the interchangeability of the circumferential installation of the sealing plate; Moving blades, sealing plates, locking plates, locking pieces, and jacking screws require heavy disassembly and installation, high manufacturing and maintenance costs; dynamic and static air seals are installed on the air inlet and outlet sides of the wheel, making the axial size of the wheel large , increasing the manufacturing cost and processing difficulty of the roulette

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