GB668434A - Improvements in and relating to internal combustion turbines - Google Patents

Abstract

668,434. Elastic-fluid turbines. HELSINGOR SKIBSVAERFT OG MASKINBYGGERI AKTIESELSKAB. Nov. 4, 1949 [Nov. 6, 1948] No. 28291/49. Class. 110(iii). [Also in Groups XIX and XXIX] In an internal combustion turbine, the rotor 1 and casing 2 of which may be axially displaced relatively to one another, the rotor and guide blades 3, 4 have oblique end edges all inclined in the same direction and at the same angle as the corresponding sealing-surfaces 5 and 7 respectively in the casing and rotor, and an adjusting device is provided by means of which the turbine casing and rotor are automatically displacable relatively to one another, the device being designed so that the minimum clearance occurring in the turbine will be approximately constant. Compressed air is led into the compartments 14, 15, the compartment 14 leading to a bore 12 in the guide blade 4, and the compartment 15 leading through an outlet 18 of the same cross-sectional area as the bore 12, to a space between two guide blades in the same row as blade 4. A throttling plate 22 is placed opposite the outlet 18 and may be adjusted by the screw 23 so that the gap between the plate 22 and the outlet 18 is equal to the desired blade tip clearance. If the clearance 10' varies, a difference in pressure is set up in the compartments 14, 15 which is communicated to the piston 28, movement of which causes the servo-motor piston valve 30a to allow oil to pass to one side of the piston 32 which operates a mechanism to adjust the relative axial positions of the turbine rotor and casing to restore the desired blade tip clearance. As shown in Fig. 2, four servo-mechanisms are connected through the pistons 28 to circumferentially-spaced guide blades in the same row. The servo-mechanisms are coupled to the piston 32 of the adjusting mechanism and are so arranged that the mechanism is dependent on the minimum guideblade clearance.