(19)
(11) EP 0 413 663 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.01.1992 Bulletin 1992/03

(43) Date of publication A2:
20.02.1991 Bulletin 1991/08

(21) Application number: 90810598.4

(22) Date of filing: 08.08.1990
(51) International Patent Classification (IPC)5: F04D 29/36, F04D 19/00
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 14.08.1989 AR 314658

(71) Applicant: CEUTE S.A.
CH-6900 Lugano (CH)

(72) Inventor:
  • Mucci, Ricardo Luciano
    Granadero Baigorria, Sta. Fe. (AR)

(74) Representative: Baggiolini, Raimondo Patent Attorneys et al
Fiammenghi-Fiammenghi Via San Gottardo 15
CH-6900 Lugano
CH-6900 Lugano (CH)


(56) References cited: : 
   
       


    (54) Industrial axial-flow fan having offset airfoil-to-hub mounting system for improved aerodynamic performance


    (57) An industrial fan (1) having a plurality of blades (2) attached to a common hub (21), wherein each blade (2) has a substantially uniform aerodynamic shape the lenght thereof including its root, by virtue of novel attachment means which do not require added strengthening of the root deforming its aerodynamic shape, thereby improving overall performance. The attachment means include an intermediate member (13) of each blade (2) coupled to the hub (9) and clamped against one of the faces of the associated blade (2). Radial pivot means are provided between each intermediate member (13) and the hub (9) according to feathering axes offset from the blade longitudinal axes, for manually adjusting the pitch (angle of incidence) of the blades according to a required flow. The invention also includes a pneumatic system (30) for varying the position (pitch) of the fan blades in motion.







    Search report