(19)
(11) EP 1 429 032 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.06.2004 Bulletin 2004/27

(43) Date of publication A2:
16.06.2004 Bulletin 2004/25

(21) Application number: 03011358.3

(22) Date of filing: 19.05.2003
(51) International Patent Classification (IPC)7: F04D 27/02, F04D 29/42
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 11.12.2002 JP 2002358832

(71) Applicant: Hitachi Industries Co., Ltd.
Tokyo (JP)

(72) Inventors:
  • Tanaka, Kenji, c/o Hitachi Industries Co., Ltd.
    Tsuchiura-chi, Tokyo (JP)
  • Ito, Toshio, c/o Hitachi Industries Co., Ltd.
    Chiyoda-machi, Tokyo (JP)
  • Konno, Toyoo, c/o Hitachi Industries Co., Ltd.
    Tomobe-machi, Tokyo (JP)
  • Orikasa, Hideaki, c/o Hitachi Industries Co., Ltd.
    Chiyoda-machi, Tokyo (JP)

(74) Representative: Hano, Christian, Dipl.-Ing. et al
v. Füner Ebbinghaus Finck Hano Mariahilfplatz 2 & 3
81541 München
81541 München (DE)

   


(54) A centrifugal compressor having inlet guide vanes


(57) A centrifugal compressor has a plurality of inlet guide vanes (12a) arranged in a circumferential direction. An outer cylinder (14a) holding the inlet guide vanes (12a) has a larger inner diameter around the inlet guide vanes (12a) than diameters at other areas thereof. Likewise, an inner cylinder (13a) has a larger outer diameter around the inlet guide vanes (12a) than diameters at other areas thereof. Thereby, the inlet guide vanes (12a) can be improved in reliability even when the centrifugal compressor becomes high in suction pressure.






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