Centrifugal water pump

Details Centrifugal water pump Centrifugal water pump

2007-09-04

2007-09-04

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Casing having tangential inlet or outlet

C416S185000, C416S203000

Reexamination Certificate

active

11040617

ABSTRACT:
A pump includes a housing defining an internal chamber having an axial inlet passage, a generally radial passage with an outlet to a volute. A rotatable impeller, disposed within the chamber, has a conical rear shroud sloping away from the axial inlet to define a rear recess. A shaft seal is disposed within the recess to minimize the axial length of the pump. A front surface of the shroud carries vanes operable to impel fluid from the axial inlet passage to the volute. Portions of the vanes extend forward into the axial inlet passage to induce coolant pre-rotation in the inlet passage and to improve pump efficiency. Pump efficiency may be further increased by a conical wall defining the axial inlet passage, a sloped wall defining the radial passage and a large radius between the axial inlet and the sloped wall to smooth fluid flow between the axial inlet passage and the volute.

REFERENCES:
patent: 3130679 (1964-04-01), Sence
patent: 3162135 (1964-12-01), Nichols et al.
patent: 3260216 (1966-07-01), Mann et al.
patent: 3295456 (1967-01-01), Warren
patent: 4239453 (1980-12-01), Hergt et al.
patent: 5605444 (1997-02-01), Paton et al.
patent: 2003/0175118 (2003-09-01), Chujo et al.

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