(19)
(11) EP 1 857 683 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.02.2010 Bulletin 2010/08

(43) Date of publication A2:
21.11.2007 Bulletin 2007/47

(21) Application number: 07107751.5

(22) Date of filing: 08.05.2007
(51) International Patent Classification (IPC): 
F04D 29/42(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 MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 16.05.2006 IT PD20060193

(71) Applicant: LN 2 - S.R.L.
62010 Montecassiano (MC) (IT)

(72) Inventors:
  • Ranalli, Antonio
    66020 Scerni (CH) (IT)
  • Tanoni, Francesco
    62100 Macerata (IT)
  • Teobaldelli, Gabriele
    62010 Urbisaglia (MC) (IT)

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

   


(54) Centrifugal fan, particularly for extractor hoods and fume extractors


(57) A centrifugal fan comprises a casing (2) having a helical external profile, defined by a pair of half-shells (2a, 2b) capable of being coupled to each other, a fan wheel (3) mounted in the casing (2) and capable of being driven in rotation about a first axis (X), there being defined in the casing (2) a lateral suction aperture (6), coaxial with the first axis (X), and a tangential delivery aperture (5), coaxial with a second axis (Y) directed tangentially to the fan wheel (3), inside the casing (2) a pressure chamber (7) being defined having a volume formed between the fan wheel (3) and the inner helical profile (3b) of the casing (2). The fan further comprises a flow separator (8) arranged at the zone (M) having the smallest radial distance between the fan wheel (3) and the inner profile (3b) of the casing (2), the flow separator (8) being defined conjointly by a pair of appendages (9), each formed in the respective casing half-shell (2a, 2b).







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