Patent ID: 6094905
Filing Date: 2000-08-01
Classification: F01D,F05D

Abstract:
A cooling apparatus for a moving blade of a gas turbine having a rotor, in which a plurality of discs are mounted with an interval between adjacent discs, a plurality of moving blades are respectively mounted to an outer peripheral portion of the discs and a plurality of spacers are disposed in spaces between the respective discs at portions corresponding to portions of location of stationary blades wherein the moving blades are formed each with a cooling medium flowing passage having inlet and outlet portions communicated with an interior of the rotor and the discs and the spacers are arranged with spaces therebetween for passing a cooling medium in a radial direction of the rotor, thereby comprising a closed-loop cooling unit for supplying the cooling medium to the cooling medium flowing passage formed in the moving blade and recovering the same therefrom, said cooling apparatus for the moving blade comprising:a supply mechanism for supplying a cooling medium to the cooling medium flowing passage of the rotor;a passage assembly provided at a central portion of the turbine rotor and operatively connected to the cooling medium supply mechanism, said passage assembly being provided with a cooling medium supplying passage and a cooling medium recovering passage running in parallel with each other in an axial direction of the turbine rotor, said cooling medium supply passage being operatively connected to the cooling medium flowing passage of the rotor and the cooling medium then being returned to the cooling medium recovering passage; anda recovery mechanism connected to the passage assembly and adapted to recover the cooling medium, after cooling, outside the cooling apparatus,said cooling medium supplying passage of the passage assembly being formed with a cooling medium supplying port in communication with a side of a cooling medium inlet of the cooling medium flowing passage formed in the moving blade through said space, and said cooling medium recovering passage of the passage assembly being formed with a cooling medium recovering port in communication with a cooling medium outlet of the cooling medium flowing passage in the moving blade through said space andsaid passage assembly comprising a columnar member mounted at the central axis portion of the turbine rotor and the cooling medium supplying passage and the cooling medium recovering passage being formed of a plurality of bores provided at intervals around a circumferential direction of the columnar member.