Patent ID: 7625180

Claim:
A turbine airfoil comprising: an airfoil main structure having the general shape of the airfoil and forming a leading edge and a trailing edge, and a pressure side and a suction side of the airfoil structure, the airfoil main structure forming a cooling air supply cavity; a plurality of impingement cells formed on the airfoil main structure on the pressure side and the suction side; an impingement hole connecting the cooling air supply cavity to the impingement cell; a film cooling hole connecting the impingement cell to an outer surface of the airfoil; a thin outer wall secured over the airfoil main structure, the thin outer wall enclosing the impingement cell and forming part of the film cooling hole; and, the rows of impingement cells are staggered in which an impingement cell in a first row is positioned between adjacent impingement cells in an adjacent second row.