WATER-STEAM SCREW EXPANDER Russian patent published in 2011 - IPC F01C1/16 F01D1/38 F01D25/30 F01C21/18 F01K25/04 

FIELD: machine building.

SUBSTANCE: water steam screw expander consists of case of high pressure with inlet branch and of case of low pressure with outlet branch. Driving and driven screws of parallel installed rotors arranged in a steam working cavity of the low pressure case. The rotors are additionally interconnected with engaged synchronising gears. A replaceable spacer is set between the said cases. In the spacer there is made a window connecting the steam working cavity with the inlet branch and there is at least one chamber open from the side of steam working cavity. With outlet steam lines the chamber is connected to consumers of steam of intermediate pressure. The second chamber is preferably made in the spacer, while the said window is positioned between the chambers. Windows for withdrawal of steam of intermediate pressure can be additionally made in a side wall of the low pressure case. The expander can be used not only for its intended purpose under a standard mode, but it can withdraw steam of intermediate pressure to a consumer.

EFFECT: expanded range of functionality and efficient utilisation of produced steam.

3 cl, 4 dwg