STEAM TURBINE Russian patent published in 2011 - IPC F01D5/08 F01D3/04 

FIELD: engines and pumps.

SUBSTANCE: steam turbine with casing (2, 3), note that inside the casing (2, 3) there installed is a shaft (5) with the possibility of rotation that contains shift compensating piston (4) and directed along rotation (6) axis, between the casing (2, 3) and shaft (5) there performed is flowing channel (9). Inside the shaft (5) there is cooling line (17) for supply of steam coolant in the direction of rotation (6) axis. Cooling (17) line is connected, on the one hand, to, at least, one supply (16) line for steam coolant supply from flowing channel (9) into cooling line (17) and, on the other hand, to, at least, one outlet line (18) for steam coolant discharge to the side surface (19) of shift compensating piston (4). It features that it contains return line (21) for return of mixed steam that consists of steam coolant coming from outlet line (18) and part of working steam that passes in a form of a leak between casing (2, 3) and shaft (5) towards shift compensating piston (4). Note that return line (21) begins in working steam input area (10) and outlet line (18) output and falls into flowing channel (9).

EFFECT: increase of cooling efficiency of steam turbine thermal loaded areas that allows to use steam of higher temperature.