(19)
(11) EP 2 400 162 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.06.2017 Bulletin 2017/23

(43) Date of publication A2:
28.12.2011 Bulletin 2011/52

(21) Application number: 11170800.4

(22) Date of filing: 21.06.2011
(51) International Patent Classification (IPC): 
F04D 29/42(2006.01)
F04D 29/44(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: 24.06.2010 IT PD20100047 U

(71) Applicant: SIT S.P.A.
35129 Padova (IT)

(72) Inventors:
  • Mazzieri, Paolo
    60027 Osimo (AN) (IT)
  • Ranalli, Antonio
    62010 MONTEFANO (MC) (IT)

(74) Representative: Fabris, Stefano et al
Cantaluppi & Partners S.r.l. Piazzetta Cappellato Pedrocchi, 18
35122 Padova
35122 Padova (IT)

   


(54) Improved centrifugal fan, in particular for extractor hoods


(57) A centrifugal fan with a helical external profile, formed by a pair of half-shells which may be coupled to one another, an impeller mounted in the body which can be driven in rotation about a first axis (X), the body being provided with a pair of opposing lateral extraction openings coaxial with the first axis and a tangential delivery opening coaxial with a second axis positioned tangentially with respect to the impeller, a pressure chamber being formed in the body whose volume is formed between the impeller and the helical profile of the body, this helical profile developing from a point at a minimum radial distance from the first axis in a median plane (P) of symmetry of the body (2).







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