Multi-stage compressor having first and second passages for cool

Details Multi-stage compressor having first and second passages for cool Multi-stage compressor having first and second passages for cool

1997-09-02

1999-11-09

Freay, Charles G.

Pumps

With intercooler

417369, 417366, F04B 2500, F04B 3906

Patent

active

059802189

ABSTRACT:
A multi-stage compressor having at least two compressor stages comprises an inter-cooler provided between the stages for cooling a gas being discharged from a compressor in the preceding stage. The compressor stages are driven by a common electric motor, of which a rotating shaft is supported by magnetic bearings. A part of the gas cooled by the inter-cooler and a part of the work gas discharged from a bleed valve provided down-stream of a rear stage of the compressor are selectively introduced into the electric motor or the magnetic bearings. Thus, at the time of load operation the gas discharged from the inter-cooler is introduced into the motor or the magnetic bearings to cool them, and at the time of non-load operation the gas discharged from the bleed valve is introduced into the motor or the magnetic bearings to cool them. It is possible to ensure a flow rate of gas required for cooling the motor during non-load operation with economy during load operation.

REFERENCES:
patent: 2921446 (1960-01-01), Zulinke
patent: 3022638 (1962-02-01), Caswell et al.
patent: 3232074 (1966-02-01), Weller et al.
patent: 3744935 (1973-07-01), Magni
patent: 3748065 (1973-07-01), Pilarczyk
patent: 3802795 (1974-04-01), Nyeste et al.
patent: 4141708 (1979-02-01), Lavigne et al.
patent: 4554799 (1985-11-01), Pallanch
patent: 5312226 (1994-05-01), Miura et al.
patent: 5664939 (1997-09-01), Giordani et al.

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