(19)
(11) EP 2 631 436 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.12.2017 Bulletin 2017/50

(43) Date of publication A2:
28.08.2013 Bulletin 2013/35

(21) Application number: 13156130.0

(22) Date of filing: 21.02.2013
(51) International Patent Classification (IPC): 
F01D 25/30(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 24.02.2012 JP 2012038725

(71) Applicant: Kabushiki Kaisha Toshiba
Tokyo 105-8001 (JP)

(72) Inventors:
  • Saeki, Hiroshi
    Tokyo, 105-8001 (JP)
  • Uchida, Tatsuro
    Tokyo, 105-8001 (JP)
  • Shibukawa, Naoki
    Tokyo, 105-8001 (JP)
  • Imai, Kenichi
    Tokyo, 105-8001 (JP)

(74) Representative: Hoffmann Eitle 
Patent- und Rechtsanwälte PartmbB Arabellastraße 30
81925 München
81925 München (DE)

   


(54) Steam turbine


(57) A steam turbine 10 in an embodiment includes: an inner casing 21 surrounding a turbine rotor; an outer casing 20 composed of an upper half side outer casing 20a and a lower half side outer casing 20b; and an annular diffuser 50 through which steam passed through a turbine stage is discharged radially outward. A vertical distance H from a axis of a turbine rotor 23 to an inner wall of the upper half side outer casing 20a, an outermost diameter D of final stage rotor blades 22a, a blade height B of the fmal stage rotor blade 22a, and a distance W between inner walls in vertical and horizontal directions to the axis of the turbine rotor 23, at a bottom portion of the lower half side outer casing 20b forming a discharge port 60, satisfy (H - D/2)/B≤1.7 and (W - D)/2B≥2.







Search report









Search report