Turbine cooling blade with blade tip leakage prevention structure

Abstract

The invention relates to a turbine cooling blade with a blade tip leakage prevention structure. A blade body is internally provided with a cooling channel; a blade tip partition rib extending from the front edge of the blade body to the tail edge of the blade body is arranged on the outer surface of a blade tip plate of the blade body; and more than one jet hole communicated with the cooling channel is distributed on the blade tip plate from the front edge to the tail edge of the blade body and is positioned at one side or two sides of the blade tip partition rib along the extending direction of the blade tip partition rib. According to the turbine cooling blade with the blade tip leakage prevention structure, the blade tip partition rib is arranged on the outer surface of the blade tip plate from the front edge to the tail edge of the blade body; when in use, the blade tip partition rib is positioned in a gap between the turbine blade and the sealing structure so as to replace the existing blade tip girdle structure, so that gas loss in the blade tip gap can be reduced, and no blade tip girdle structure is needed; and at the same time, the structure of the blade tip partition rib is simple, so that the blade tip partition rib can be rapidly maintained when being abraded or damaged after long time work of the turbine blade; and therefore, the turbine blade has high maintainability.

Description

technical field [0001] The invention relates to a turbine cooling blade with a tip leakage prevention structure used in a gas turbine. Background technique [0002] The turbine blade is an important part of a gas turbine. The existing turbine blade includes a blade body, and the inside of the blade body has a cooling channel. During operation, the top plate of the gas turbine blade is matched with the sealing structure of the casing, and the gap between the two The resulting high-temperature gas leakage is the most important factor for the loss of turbine efficiency. This is due to the harsh environment of high temperature, high pressure and high speed in which the turbine blades work, which makes it difficult to realize the deformation of the turbine disk, blades and casing due to centrifugal force and temperature stress. The optimal fit design under various working conditions, there is always a certain gap between the turbine blades and the sealing structure, and this gap ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a turbine cooling blade with a blade top leakage prevention structure to solve the problem of using the blade tip shroud structure to reduce the turbine blade tip clearance in the prior art because of the complicated structure of the blade tip shroud structure. Inconvenient maintenance and long maintenance cycle

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