(19)
(11) EP 1 640 617 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.08.2012 Bulletin 2012/32

(43) Date of publication A2:
29.03.2006 Bulletin 2006/13

(21) Application number: 05003526.0

(22) Date of filing: 18.02.2005
(51) International Patent Classification (IPC): 
F04D 29/22(2006.01)
 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 MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR LV MK YU

(30) Priority: 24.09.2004 CN 200420088569
17.11.2004 CN 200410052345

(71) Applicant: Shenzhen Xing Risheng Industrial Co., Ltd.
Baolong Industry City, Longgang, Shenzhen, 518118 (CN)

(72) Inventor:
  • Deng, Peixing
    Longgang Shenzhen, 518118 (CN)

(74) Representative: Grättinger Möhring von Poschinger Patentanwälte Partnerschaft 
Postfach 16 55
82306 Starnberg
82306 Starnberg (DE)

   


(54) Free vortex pump


(57) An electric water pump rotating in the correct direction, comprising a water pump body (2) that has a chamber (3), which is basically cylindrical in shape, and a chamber cover (8), which is fitted at the axial outward end of said chamber (3); an impeller (42) is accommodated and rotates inside said chamber (3) coaxially; said impeller (42) includes at least two impeller vanes (45) that project from the impeller disc surface (44) and said impeller vanes (45) bend to the same direction around the rotating axis OO' of said disc surface (44); Assuming V as the volume inside said chamber (3) and v as the volume enveloped by all the said impeller vanes (45) when said impeller (42) rotates, a design can be made about relations of geometrical parameters between volume of said chamber (3) in said electric water pump and said volume enveloped by all the impeller vane (45) rotating inside said chamber (3) to be in the following range, i.e., ratio between volume enveloped by all the said impeller vane (45) in rotation and volume of said chamber (3):






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Search report