Expansion turbine having a variable nozzle mechanism

摘要

Expansion turbine (42) having a variable nozzle mechanism 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 (50) during adiabatic expansion of very low temperature gas, and varies the throat area of very low temperature gas introduced in the turbine impeller (50) by driving a nozzle member (54) disposed near the outside end of the adiabatic expansion device (44) by a drive force from a driving member (52) located outside the vacuum container (48); a plate member (56) provided detachably in contact with the outside end of the body of the adiabatic expansion device (44), wherein the support side of the nozzle member (54) is connected to and supported by the plate member (56), and the drive side of the nozzle member (54) is connected to and supported by the driving member (52).