Gas turbine moving blade tip shroud

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 5/18 (2006.01) F01D 5/20 (2006.01)

Patent

CA 2264076

This invention related to a tip shroud for a moving blade to be used at a downstream stage of a gas turbine. The tip shroud is elongated in its creep lifetime by feeding it effectively with cooling air. In the tip shroud 11, there are cut-off portions 12 and 13 which are passed by a hot combustion gas so that they are influenced by a thermal stress and liable to have a creep. On the shroud faces, there are formed grooves 31 and 32, and 33 and 34, and cooling guide covers 21 and 22. Cooling guide covers 21 and 22 are closed at their one side with members 21a and 22a are opened at their other end to cover the air holes 17 so that the cooling air is fed to cool the cut-off portions 12 and 13 individually. The metal temperature rise in the cut-off portions 12 and 13, as will be influenced by the hot combustion gas, can be suppressed to elongate the creep lifetime of the tip shroud.

Ce carénage d'extrémité pour aubes mobiles, qui est placé à l'arrière d'une turbine à gaz, est alimenté en air de refroidissement et ce, afin d'allonger sa durée utile de résistance au fluage. Le carénage d'extrémité (11), qui comporte des parties découpées (12, 13) traversées par les gaz de combustion à haute température et soumises à l'influence d'une contrainte thermique, constituant, de ce fait, des parties sujettes au fluage, comporte également des gorges (31, 32; 33, 34) ménagées à la surface du carénage ainsi que des protections de guides de refroidissement (21, 22) pour chaque ensemble de gorges. Ces protections (21, 22), fermées sur l'une de leurs extrémités par des dispositifs (21a, 21b) et ouvertes sur les autres, recouvrent des trous d'évent (17) et alimentent en air de refroidissement les parties découpées (12, 13). Cet apport d'air de refroidissement évite une élévation de la température du métal des parties découpées (12, 13) soumises à la température élevée des gaz de combustion et prolonge la durée utile de résistance au fluage du carénage.

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