초록 ▼

An oil free high speed gas compressor driven by a high frequently electric motor with a soft magnetic armature which holds permanent magnets arranged peripherally and a centrifugal impeller overhung at one or at each end of the shaft of the armature of the motor, wherein the temperature of the armat

An oil free high speed gas compressor driven by a high frequently electric motor with a soft magnetic armature which holds permanent magnets arranged peripherally and a centrifugal impeller overhung at one or at each end of the shaft of the armature of the motor, wherein the temperature of the armature is held within the characteristic temperatureof its permanent magnets by a flow of cooling liquid through a central bore in the armature or by a flow of cooling liquid through a central drilling through a tie-bolt in thermal contact with a bore in the armature.

대표청구항 ▼

[ What is claimed is:] [1.]1. A compressor comprising a rotatable shaft, drive means for rotating the shaft, at least one impeller rotor stage mounted on the shaft, and a tie bolt mounted through said at least one impeller rotor stage and through at least part of said shaft to hold said at least one

[ What is claimed is:] [1.]1. A compressor comprising a rotatable shaft, drive means for rotating the shaft, at least one impeller rotor stage mounted on the shaft, and a tie bolt mounted through said at least one impeller rotor stage and through at least part of said shaft to hold said at least one impeller rotor stage to said shaft, said tie bolt having a hollow interior, wherein the rotatable shaft and the at least one impeller rotor stage are hollow and a supply of liquid is provided to flow axially through them, via the hollow interior of said tie bolt, as a coolant liquid.