Patent ID: 6843637

Claim:
A closed loop cooling circuit within a turbine nozzle including first, second and third cavities, an outer band, and an inner band, the cooling circuit comprising: an inlet receiving cooling medium flow; a first duct insert disposed in the second cavity, the first duct insert receiving the cooling medium flow via the inlet and duct flowing the cooling medium flow to a bottom of the second cavity; an impingement insert disposed in the first cavity and receiving the cooling medium flow from the first duct insert; a first impingement plate disposed within the outer band and defining an outer band cooling path within the outer band, the outer band cooling path receiving the cooling medium flow from the first cavity; wherein a second cavity cooling path is defined between the first duct insert and a second cavity wall, the second cavity cooling path receiving the cooling medium flow from the outer band cooling path; a second impingement plate disposed within the inner band and defining an inner band cooling path within the inner band, the inner band cooling path receiving the cooling medium flow from second cavity cooling path; and a second duct insert disposed in the third cavity defining a third cavity cooling path between the second duct insert and a third cavity wall, the third cavity cooling path receiving the cooling medium flow from the inner band cooling path.