(19)
(11) EP 2 617 951 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.08.2014 Bulletin 2014/35

(43) Date of publication A2:
24.07.2013 Bulletin 2013/30

(21) Application number: 13151786.4

(22) Date of filing: 18.01.2013
(51) International Patent Classification (IPC): 
F01D 25/32(2006.01)
F01D 5/14(2006.01)
 F01D 5/22(2006.01)
F01D 11/08(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: 19.01.2012 JP 2012008849

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

(72) Inventors:
  • Tsukuda, Tomohiko
    Tokyo, Tokyo 105-8001 (JP)
  • Kawakami, Hiroshi
    Tokyo, Tokyo 105-8001 (JP)
  • Kawasaki, Sakae
    Tokyo, Tokyo 105-8001 (JP)
  • Shibukawa, Naoki
    Tokyo, Tokyo 105-8001 (JP)
  • Ohashi, Shinichiro
    Tokyo, Tokyo 105-8001 (JP)
  • Iwasaki, Yoshifumi
    Tokyo, Tokyo 105-8001 (JP)

(74) Representative: Kramer - Barske - Schmidtchen 
Landsberger Strasse 300
80687 München
80687 München (DE)

   


(54) Tip cover of a steam turbine for the drainage of water droplets


(57) A steam turbine includes: a turbine rotor shaft; a plurality of blades that are provided on the turbine rotor shaft and are rotated by a steam flow; tip covers that are attached to tip ends of the respective blades and are connected to and in contact with one another; at least one water drip fin that is provided along a circumferential direction at the tip cover, and outwardly extends in a radial direction of each of the blades; and a diaphragm outer ring that is disposed at an outer circumferential side from each of the blades, and has a drain catcher opposed to a tip end portion of the water drip fin, wherein the tip cover is provided with a leading edge that is formed at a downstream side in an axial direction from a leading edge of the blade or at a position in the axial direction corresponding to the leading edge of the blade in the axial direction.







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