Expansion turbine with a variable guiding nozzle mechanism

摘要

Expansion turbine (42) having a variable nozzle mechanism (100) comprises an adiabatic expansion device (44) located in a vacuum container (48) having a turbine impeller (50) threrein which rotates and drives the turbine impeller during adiabatic expansion of very low temperature gas, and varies the throat area of very low temperature gas introduced in the turbine impeller by driving a nozzle member (54) disposed near the outside end of the adiabatic expansion device by a drive force from a driving member (53) located outside the vacuum container; wherein the driving member comprises a cylindrical member (58) disposed coaxially with the turbine impeller, and the nozzle member is provided on the extension of the body of the cylindrical member in the axial direction.