EP 2025942 A2 20090218 - Submersible multistage pump with impellers having diverging shrouds
Title (en)
Submersible multistage pump with impellers having diverging shrouds
Title (de)
Mehrstufen-Tauchpumpe mit Pumpenrädern mit divergierenden Deckbändern
Title (fr)
Pompe submersible à phases multiples avec des turbines disposant des flasques divergentes
Publication
Application
Priority
US 95338607 P 20070801
Abstract (en)
A centrifugal pump may include plural pump stages (300), each comprising an impeller assembly (304), a stationary disc assembly (306) and a diffuser assembly (302), all disposed about an impeller shaft (102) that is driven by a motor. The impeller assembly (304) may include upper and lower impeller shrouds (338,334) having facing surfaces, and a plurality of impeller vanes (344) extending between the surfaces of the shrouds (338,334) to define a plurality of flow passages (346) for liquid to flow outwardly from a central hub (340) of the impeller assembly (304). To assist in pressure recovery of the pump, the distance between the surfaces of the impeller shrouds (338,334) may increase as the radial distance from the central hub (340) increases.
IPC 8 full level
F04D 1/06 (2006.01); F04D 13/08 (2006.01); F04D 29/22 (2006.01); F04D 29/44 (2006.01)
CPC (source: EP US)
F04D 1/063 (2013.01 - EP US); F04D 13/08 (2013.01 - EP US); F04D 29/2255 (2013.01 - EP US); F04D 29/448 (2013.01 - EP US)
Citation (applicant)
- US 2006269404 A1 20061130 - VOLK JAMES J [US]
- US 3116696 A 19640107 - DETERS ELMER M
- US 3288074 A 19661129 - HALL MALCOLM S
- US 4678399 A 19870707 - VANDEVIER JOSEPH E [US], et al
- US 4802819 A 19890207 - BEVINGTON JACK T [US], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
EP 2025942 A2 20090218; EP 2025942 A3 20100818; US 2009047119 A1 20090219
DOCDB simple family (application)
EP 08161663 A 20080801; US 18322208 A 20080731