(19)
(11) EP 1 849 960 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.03.2010 Bulletin 2010/10

(43) Date of publication A2:
31.10.2007 Bulletin 2007/44

(21) Application number: 07008241.7

(22) Date of filing: 23.04.2007
(51) International Patent Classification (IPC): 
F01D 5/18(2006.01)
F01D 9/04(2006.01)
 F01D 5/20(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 27.04.2006 JP 2006122884

(71) Applicant: Hitachi, Ltd.
Chiyoda-ku Tokyo 100-8280 (JP)

(72) Inventors:
  • Akiyama, Ryou c/o Hitachi Ltd, Intellectual Property Group,
    Tokyo 100-8220 (JP)
  • Horiuchi, Yasuhiro c/o Hitachi Ltd, Intellectual Property Group,
    Tokyo 100-8220 (JP)
  • Marushima, Shinya c/o Hitachi Ltd, Intellectual Property Group,
    Tokyo 100-8220 (JP)

(74) Representative: MERH-IP Matias Erny Reichl Hoffmann 
Paul-Heyse-Strasse 29
80336 München
80336 München (DE)

   


(54) Turbine blade having internal cooling passage


(57) A turbine blade can be provided which enhances efficiency of a gas turbine by being efficiently cooled and has a high degree of reliability.
The turbine blade includes an internal cooling passage (4,5,7a-7f), and a plurality of projections (16) on a blade ventral side wall surface and a rear side wall surface of the cooling passage on a blade trailing edge side (13) thereof or a plurality of portions (e.g., cylindrical pin fins extending from the blade trailing edge side (13) ventral side wall surface to the blade trailing edge side rear side wall surface) connecting the blade ventral side wall surface with the rear side wall surface. The projections (16) or the portions are arranged so as to have different passage resistances depending on a position on the wall surfaces on the blade trailing edge side. This reduces the necessary amount of the cooling medium while performing efficient cooling.







Search report