(19)
(11) EP 1 335 111 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.11.2003 Bulletin 2003/45

(43) Date of publication A2:
13.08.2003 Bulletin 2003/33

(21) Application number: 03004315.2

(22) Date of filing: 29.11.1996
(51) International Patent Classification (IPC)7: F01D 5/08
(84) Designated Contracting States:
DE FR GB

(62) Application number of the earlier application in accordance with Art. 76 EPC:
96940152.0 / 0965726

(71) Applicant: Hitachi, Ltd.
Chiyoda-ku, Tokyo 101 (JP)

(72) Inventors:
  • Marushima, Shinya
    Hitachinaka-shi, Ibaraki 312-0057 (JP)
  • Matsumoto, Manabu
    Higashiibaraki-gun, Ibaraki 311-3116 (JP)
  • Kawaike, Kazuhiko
    Hitachinaka-shi, Ibaraki 312-0012 (JP)
  • Ikeguchi, Takashi
    Hitachi-shi, Ibaraki 316-0014 (JP)
  • Machida, Takashi
    Tsuchiura-shi, Ibaraki 300-0065 (JP)
  • Sekihara, Masaru, Sanhiruta Omika Room 303
    Ibaraki, 319-1221 (JP)

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

   


(54) Coolant recovery type gas turbine


(57) A gas turbine includes a rotor shaft comprising a plurality of discs (8, 9, 10, 11, 12a). Each disc (8, 9, 10, 11, 12a) has a plurality of moving blades (4, 5, 6, 7, 7a) driven by combustion gas and arranged annularly on the peripheral portion. Spacers (11a, 13, 14, 15) are arranged between the discs (8, 9, 10, 11, 12a), the respective discs (8, 9, 10, 11, 12a) and the spacers (11a, 13, 14, 15) being arranged in the axial direction. The moving blades (4, 5, 6, 7, 7a) are provided with flow paths (8a, 9a) for introducing coolant for cooling and discharging the coolant heated by the combustion gas. Contact surfaces (16a, 31, 32, 33, 34, 35, 36) contacting both the discs (8, 9, 10, 11, 12a) in rotor peripheral side regions and adjacent spacers (11a, 13, 14, 15) are formed therebetween. A supply flow path (8a) passes through the discs (8, 9, 10, 11, 12a) and the spacers (11a, 13, 14, 15) in the regions forming the contact surfaces (16a, 31, 32, 33, 34, 35, 36) and supply the coolant for cooling the moving blades (4, 5, 6, 7, 7a). A recovery flow path (9a) recovers the coolant which is heated by the moving blades (4, 5, 6, 7, 7a).






Search report