Patent ID: 6764281
Filing Date: 2004-07-20
Classification: F01D,Y02T

Abstract:
A rotor system for an expansion turbine for low-temperature applications comprising:a) a turbine rotor which allows cold gas to be centripetally flowed through; b) a turbine shaft having a threaded bore; c) a pre-tensioned stud screw inserted into said threaded bore on a face side of said turbine shaft and extending through said turbine rotor; d) a rotor nut secured on a protruding end of said pre-tensioned stud screw; and e) a turbine hub cap made from a heat insulating material and mounted on a free end of said pre-tensioned stud screw; wherein said turbine rotor is secured in an overhung manner on an end of said turbine shaft via said rotor nut and said pre-tensioned stud screw and wherein said turbine hub cap projects into said cold gas flowing off and also projecting onto said rotor nut.