Patent ID: 7131814

Claim:
A cooling arrangement for the admission of a cooling gas to a first cavity, comprising: a first cavity, a second cavity spaced from the first cavity, and a third cavity spaced from the first cavity; a first component having a wall separating the first cavity from the second cavity, the wall having a bearing side; at least one cooling-gas passage arranged in said wall and communicatingly connecting the first cavity to the second cavity; a second component bearing against the wall on the bearing side remote from the second cavity and separating the first cavity from the third cavity; the second component being displaceable along the wall within a predetermined range of displacement; the at least one cooling-gas passage including an orifice region facing the first cavity dimensioned, positioned, or both, so that an orifice cross section projects from the range of displacement at least to such an extent that the orifice region is open at least with a predetermined minimum cross section in any position of the second component within the range of displacement; wherein the first component comprises a heat shield of a gas turbine, said heat shield, with respect to a rotation axis of a rotor of the gas turbine, being exposed radially on the inside to the third cavity and radially on the outside to the first cavity and to the second cavity; wherein the wall projects radially outward from the heat shield; wherein the wall extends in the circumferential direction; wherein the at least one cooling-gas passage comprises a plurality of circumferentially distributed cooling-gas passages arranged in the wall; a gap connecting the first cavity to the third cavity; and wherein the second component comprises a seal which bears against the wall of the heat shield and is configured and arranged to bear against a second heat shield or against a root of a guide blade of the gas turbine, and seals said gap.