(19)
(11) EP 2 278 224 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.02.2013 Bulletin 2013/09

(43) Date of publication A2:
26.01.2011 Bulletin 2011/04

(21) Application number: 10169982.5

(22) Date of filing: 19.07.2010
(51) International Patent Classification (IPC): 
F23D 14/36(2006.01)
F23L 5/02(2006.01)
 F23D 14/64(2006.01)
F04D 29/42(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 SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 22.07.2009 IT PD20090215

(71) Applicant: LN 2 S.R.L. a socio unico
62010 Montecassiano (MC) (IT)

(72) Inventor:
  • Ranalli, Antonio
    66020, Scerni (CH) (IT)

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

   


(54) Air-gas mixer device, particularly for premix burner


(57) An air-gas mixer device, particularly for the premix burner equipment of condensing boilers, comprising flow guide means for guiding an air-gas mixture into the intake section (3a) of a centrifugal fan (2) unit with a predetermined axis of rotation (X), said intake section being coaxial with said axis of rotation, said guide means including a Venturi effect conduit structure (5) with contiguous converging and diverging portions delimiting a constricted section to which the gas flow is fed for mixing with the air flow fed through the converging conduit portion, wherein said guide conduit structure (5) is axially symmetrically developed with a main axis of symmetry coinciding with said axis of rotation (X) and is defined by the rotation about said axis of a flat section with respective contiguous converging and diverging portions (5a, 5b), which is positioned radially and is spaced apart from the axis and on whose plane said axis of rotation (X) lies.







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