(19)
(11) EP 1 826 413 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.09.2010 Bulletin 2010/38

(43) Date of publication A2:
29.08.2007 Bulletin 2007/35

(21) Application number: 07103096.9

(22) Date of filing: 27.02.2007
(51) International Patent Classification (IPC): 
F04D 29/32(2006.01)
F01D 5/16(2006.01)
 F04D 29/66(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 NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 27.02.2006 IT MI20060341

(71) Applicant: Nuovo Pignone S.p.A.
50127 Florence (IT)

(72) Inventors:
  • NOVORI, Alessio
    Florence (IT)
  • ARINCI, Paolo
    50032, Firenze (IT)
  • LORUSSO, Salvatore
    Florence (IT)

(74) Representative: Bedford, Grant Richard 
Global Patent Operation - Europe GE International Inc. 15 John Adam Street
London WC2N 6LU
London WC2N 6LU (GB)

   


(54) Rotor blade for a ninth phase of a compressor


(57) The invention relates to a blade (10) of a rotor of a ninth phase of a compressor, which can be defined by coordinates of a discreet combination of points, in a Cartesian reference system (X,Y,Z), wherein the axis (Z) is a radial axis intersecting the central axis of the compressor, said blade (10) having a profile which can be identified by means of a series of closed intersection curves between the profile itself and planes (X,Y) lying at distances (Z) from the central axis, said blade (10) also comprising a thickening (30), substantially parallel to a base portion (12) of the blade (10) itself, fixable to said rotor, said thickening (30) being substantially situated half-way up the blade (10) and being suitable for shifting the natural resonance frequencies of the blade (10) itself outside a functioning frequency range of said rotor.







Search report