(19)
(11) EP 1 855 013 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.10.2013 Bulletin 2013/43

(43) Date of publication A2:
14.11.2007 Bulletin 2007/46

(21) Application number: 07107006.4

(22) Date of filing: 26.04.2007
(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: 12.05.2006 IT PN20060038

(71) Applicant: Nidec Sole Motor Corporation S.r.l.
33170 Pordenone (IT)

(72) Inventors:
  • Sandron, Fabrizio
    30025, Fossalta di Portogruaro (Venezia) (IT)
  • Bonacina, Sergio
    22043, Galbiate (Lecco) (IT)

(74) Representative: Gonella, Mario 
Propria S.r.l. Via della Colonna, 35
33170 Pordenone
33170 Pordenone (IT)

   


(54) Improvement in the pumping chamber of a centrifugal turbine pump


(57) Centrifugal turbine pump comprising an intake conduit (1), a delivery conduit, a pumping chamber (3), an impeller (4) housed in the pumping chamber and provided with a plurality of vanes (5), wherein the intake conduit is coupled to the pumping chamber via a slightly conical flaring at the inlet-side section (16) of said intake conduit into the pumping chamber. Preferably, the edge (10) of said impeller facing the intake conduit comprises a corner-shaped section (7), wherein said corner projects into the inlet-side section of said intake conduit.
Alternatively, the site (8) at which said pumping chamber (3) couples to the inlet-side section of the intake conduit (1) is provided in the form of two contiguous pleats (30,31) resembling the bellows of an accordion, which define an annular accommodation (32) in which there are rotatably accommodated said corner-shaped portions (7) of respective ones of the vanes of said impeller.







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