INTAKE CASING OF AXIAL-FLOW STEAM TURBINE Russian patent published in 1996 - IPC

FIELD: heat-power engineering; single-flow steam turbines. SUBSTANCE: casing consists of two spiral casings 1 and 2 arranged one in other. They have circular holes located concentrically and directed to blades which cover 360 deg of perimeter. As a result, stageless partial supply of steam is effected to reactive blades 13, 14 and 15. Sizes of casing 2 and its circular holes are selected for minimum consumption and are located radially on side of rotor. First row of working blades to which steam is supplied from circular holes is row of blades located after impulse adjusting wheel. Inner bounding wall of spiral whose size is selected for minimum consumption is located radially in plane of equalizing piston. EFFECT: enhanced efficiency. 1 dwg