(19)
(11) EP 1 548 235 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.11.2008 Bulletin 2008/47

(43) Date of publication A2:
29.06.2005 Bulletin 2005/26

(21) Application number: 04257975.5

(22) Date of filing: 20.12.2004
(51) International Patent Classification (IPC): 
F01D 9/04(2006.01)
 F01D 5/18(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 MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR LV MK YU

(30) Priority: 22.12.2003 US 743516

(71) Applicant: United Technologies Corporation
Hartford, CT 06101 (US)

(72) Inventors:
  • Coons, Todd
    Arizona 85222 (US)
  • Pietraszkiewicz, Edward
    Southington Connecticut 06489 (US)

(74) Representative: Leckey, David Herbert 
Frank B. Dehn & Co. St Bride's House 10 Salisbury Square
London EC4Y 8JD
London EC4Y 8JD (GB)

   


(54) Cooled vane cluster


(57) A cast vane cluster (32) with enhanced cooling contains an inner and an outer platform (34, 36) and at least two airfoils (38) for directing a primary fluid stream axially rearward . A duct (56) is bounded by inner and outer endwall surfaces (40, 44), and adjacent airfoil fluid directing surfaces. One or more cooling holes (62) in the duct are drilled using an electrodischarge machine (EDM) method without a line of sight from the drilling equipment to the cooling hole location. One or more cooling holes (62), located in portions of the duct, may not be visible when viewed from an external location. Additionally, one or more cooling holes (62) may only have an outlet cross sectional ar ea (66) visible when viewed along a longitudinal axis from an external location.







Search report