Patent ID: 7193341
Filing Date: 2007-03-20
Classification: F04D,F16C

Abstract:
1. A turbomachine for use at cryogenic temperatures wherein uncontrolled cool-out is prevented comprising: (a) a rotor shaft having a first shaft end; (b) at least one rotor disk arranged in overhung manner at said first shaft end; (c) a stage housing surrounding said at least one rotor disk and having a plurality of connections for a cold gas flowing through said rotor disk along a flow path; (d) a machine housing connected with said stage housing; (e) an electric machine arranged in said machine housing comprising a stator having a plurality of windings and an electric rotor arranged on said rotor shaft, wherein a ring gap is arranged between said stator and said rotor; (f) a plurality of shaft bearings for said rotor shaft arranged in said machine housing; (g) a partition made of insulating material arranged between said stage housing and said machine housing, said partition thermally separating said stage housing from said machine housing and preventing an uncontrolled cool-out of the electric machine; and (h) a line comprising a flow-through regulation fitting connected to the flow path of the cold gas for branching off and passing an amount-regulated cooling stream to said electric machine, said line accomplishing an adjusted cooling in targeted manner of the electric machine; and (i) a distributor connected to said line for distributing the cooling stream into partial streams, said ring gap and said windings being impacted with the partial streams.