Compressors
AssigneeCorac Group PLC
InventorRichard Julius Gozdawa
Life of this patent
Estimating the term…
Abstract
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 temperature of 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.
Claims18
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.
A method of cooling a rotor of a compressor having a hollow rotatable shaft, drive means for rotating the shaft, at least one hollow impeller rotor stage mounted on the shaft, and a tie bolt mounted through at least part of said shaft and through said at least one impeller rotor stage to hold said at least one impeller rotor stage to said shaft, said tie bolt having a hollow interior, the method comprising providing a supply of coolant liquid and causing said coolant liquid to flow axially through the shaft and said at least one impeller rotor stage, via said hollow interior of said tie bolt, to cool the impeller, the method comprising:
- providing a supply of coolant liquid;
- and
- causing said coolant liquid to flow axially through the shaft and said at least one impeller rotor stage, via said hollow interior of said tie bolt, to cool the impeller.
An oil free high speed gas compressor comprising:
- a high frequency electric motor having a soft magnetic armature with permanent magnets arranged and held peripherally thereon, said armature having a central bore formed therein:
- a shaft including said armature and having first and second opposite ends;
- at least one centrifugal impeller overhung at one of said first and second ends of said shaft;
- and
- a tie-bolt in thermal contact with said bore in said armature, said tie bolt having a central bore therethrough, whereby to enable the temperature of the armature to be held within the characteristic temperature of its permanent magnets by a flow of cooling liquid through the central bore formed in the tie bolt.
Dependencies are inferred from the claim text.