Patent ID: 7431564

Claim:
A blisk comprising a disc having a periphery, a plurality of blades spaced apart around the periphery of the disc, each of said blades consisting of shank and an airfoil section which extends outwardly from the periphery of the disc in a generally radial direction, each airfoil blade section is formed with internal cooling passages which communicate with at least one orifice in the blade shank and has a circumferentially extending platform lying between the shank and the airfoil blade section, wherein each of said blades further comprising a root section, wherein the dimensions of the roots in the direction of the disc circumference are such that neighbouring roots abut to form a continuous ring defining the periphery of the disc, and wherein the platforms extend towards each other in a circumferential direction and confronting edges of neighbouring blades are sealed one to another to form a substantially continuous ring spaced a radial distance above the periphery of the disc such that between each pair of neighbouring shanks there is defined a plenum chamber containing the blades shanks, with which the internal cooling passages of the blades communicate.