ENVELOPE TURBINE BLADE FEATHER Russian patent published in 2000 - IPC

FIELD: mechanical engineering; turbines. SUBSTANCE: air-cooled metal screen is placed in between metal rod and ceramic shaped envelope enclosing the rod. At least one non-cooled screen is placed in clearance between envelope and cooled screen. Non-cooled screen is made in form of rolls tightly filling- in clearance in one layer, minimum. Rolls can be made in form of cylindrical rollers, or conical rollers, or balls, either hollow or in form of Dewar flasks. Rolls one can be made from thermally strong structural ceramics or composites, refractory materials, porcelain, quartz glass, refractory metals, heat-resistant alloys, graphite carbons and carbon composites. At least one of rolls can be made with outer diameter greater than that of other rolls. At least one of rolls can be made of material other than that of the rest of rolls, and at least one roll surface can be covered with mirror layer. EFFECT: increased reliability of turbine blade. 10 cl, 6 dwg