Patent ID: 9638047
Date: 2017-05-02
CPC Classifications: F01D,F05D

Claim:
1. An air cooled turbine airfoil comprising: an airfoil having a leading edge region, a trailing edge region, a pressure side wall, and a suction side wall; a first impingement surface and a second impingement surface of the airfoil separated by a rib; an inner plate bonded over the first impingement surface and the second impingement surface; the inner plate having an arrangement of first impingement cooling holes over the first impingement surface and second impingement cooling holes over the second impingement surface; the inner plate having an arrangement of return air holes in a section over the first impingement surface; an outer plate bonded over the inner plate to form a first impingement cooling chamber separated from a second impingement cooling chamber; and, the outer plate having an arrangement of cooling air supply holes and standoffs extending from a bottom side and aligned with the first impingement cooling holes to form a closed cooling air passage; wherein, cooling air from an external source flows through the cooling air supply holes in the outer plate and through the standoffs and the first impingement cooling air holes to provide impingement cooling to the first impingement surface, flows through the return air holes, and then through the second impingement cooling holes to provide impingement cooling to the second impingement surface.