Verstellbarer Leitschaufelkranz für Axialturbomaschinen, insbesondere Axialgasturbinen

摘要

805,015. Turbines. SCHWEIZERISCHE LOKOMOTIVUND MASCHINENFABRIK. June 12, 1956 [June 17, 1955], No. 18082/56. Class 110 (3). In an axial flow turbine guide blade ring comprising blades consisting on the inlet side of a fixed part and on the outlet side of a part pivotally movable relative to the fixed part each blade has the separation between the fixed and movable parts located in the region of greatest blade thickness and the sector angle of the circular arc profile bounding the gap of the pivoted part is of such magnitude that even in the most extreme positions of this part a tangential continuation of the profile of the fixed part is ensured. Each guide blade of the interstage guide blade ring 2 comprises a fixed blade part 8 which forms a rigid connection between the outer and inner blade supporting rings 9, 10 and a pivoted part 11. The separation between the stationary and movable blade parts is located at the region of greatest blade thickness. The sector angleγof the circular arc profile 14 is of such magnitude that even in the most extreme positions 111, 1111 of the movable blade parts, a tangential continuation of the profile of the fixed blade parts is ensured. The ratio of the length L of the movable blade part to the blade pitch T is preferably greater than 1: 0 and the angle y greater than 180 degrees so as to obtain a favourable channel shape at partial load. The pivoted blade parts are moved in unison by a ring 21. The inner supporting ring is made in two halves 10, 10a so that the inner ends of the blade parts 11 may be provided with pivot pins 17. Cooling air may be supplied to a cavity 23 formed in the fixed blade part 8 and discharged therefrom through gaps 12, 13. A cavity 26 formed in the movable blade part 11 may be supplied with cooling air from the cavity 23 through the duct 27. Cooling air is discharged from the cavity 26 through the ducts 28, 29, 30. The cavity 23 may be supplied with cooling air from the cavity 26 which receives the initial air supply. Specifications 736,796 and 774,501 are referred to.