Rotodynamic pump

Details Rotodynamic pump Rotodynamic pump

1999-06-16

2001-06-05

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

With cutter or comminutor for debris in working fluid

C415S121200, C415S121300, C415S199100, C415S199600, C415S208200, C415S206000

Reexamination Certificate

active

06241470

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotodynamic pump which may be, for example, mobile.
2. Background
Liquids which contain a high proportion of solids, such as sludges, slurries, and fibrous and viscous liquids are particularly difficult to pump, especially when the material to be pumped has been standing for sometime. Typically, such materials are stored in open lagoons and there is increasing environmental pressure to empty and clean these lagoons.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a rotodynamic pump which is capable of pumping liquids containing a high proportion of solids.
U.S. Pat. No. 4,527,947 describes a pump having a centrifugal impeller. A cylindrical protective screen may be provided at the bottom of the pump assembly or, alternatively, the screen may be removed and a rotating chopper having upwardly extending chopper teeth may be employed.
DE-C-4 438 841 describes a pump with a cutting device in which a cutting blade rotates relative to a counter blade, the blades being formed by edges of openings.
EP-A-0 278 388 describes a centrifugal pump in which a cylindrical member is formed with circular openings and rotates relative to an external toothed member.
U.S. Pat. No. 4,877,368 describes a fluidising centrifugal pump which incorporates a feeding vane in the form of a spiral thread and disposed radially outwardly from a fluidising blade.
DE-A-1 813 864 describes a device for continuously mixing plaster in which plaster is contacted with water from a spray and mixed by means of a paddle in a mixing chamber. The mixed plaster is then pumped with a centrifugal pump.
It is an object of the present invention to provide a rotodynamic pump which is capable of pumping liquids containing a high proportion of solids.
According to the invention there is provided a rotodynamic pump comprising a centrifugal impeller provided within a volute body, an emulsifier provided in the region of an inlet of the volute body and rotatable with the centrifugal impeller for emulsifying material to be pumped and a stationary member positioned adjacent to the emulsifier, wherein the emulsifier comprises a plurality of emulsifying blades extending in the axial direction of the centrifugal impeller and spaced laterally from the axis thereof, and wherein the stationary member comprises a plurality of stationary blades extending in the axial direction and spaced laterally from the axis for macerating the material to be pumped in conjunction with the emulsifying blades.
The emulsifying blades may be mounted on a base plate arranged at that end of the blades remote from the centrifugal impeller. The blades may have a hydrofoil shape or may be arcuate or straight and may be provided with a relatively sharp leading edge. The shape of the blades may depend upon the nature of the material to be pumped.
The pump may include an auger member rotatable with the centrifugal impeller and disposed in the region of the inlet of the volute body. The auger member may be positioned within the emulsifier.
The centrifugal impeller may incorporate a plurality of impeller blades, the blades being dimensioned to be shorter than the axial height of the volute body. The blades may be about half the axial height of the volute body.
The emulsifier may be positioned within a protective cage. The protective cage may comprise an annular ring positioned on that side of the emulsifier remote from the centrifugal impeller and secured to the volute body.
A plurality of nozzles for emollient injection may be provided around the emulsifier, for example intermediate the emulsifier and the protective cage. The nozzles may be directed in the axial direction. The nozzles may be secured to the underside of the volute body.
The stationary blades may be positioned radially within the blades of the emulsifier. The radially outer end of each stationary blade may be relatively sharp for co-operation with the blades of the emulsifier. The stationary blades may be secured to the volute body. The stationary blades may have a hydrofoil shape or may be arcuate or straight. The shape of the blades may depend upon the nature of the material being pumped.


REFERENCES:
patent: 3627280 (1971-12-01), Fridman et al.
patent: 3650481 (1972-03-01), Conery et al.
patent: 4141510 (1979-02-01), Smith
patent: 4400134 (1983-08-01), Sweeney
patent: 4454993 (1984-06-01), Shibata et al.
patent: 4527947 (1985-07-01), Elliott
patent: 4826398 (1989-05-01), Gullichsen
patent: 4877368 (1989-10-01), Timperi
patent: 5238363 (1993-08-01), Thielke et al.
patent: 219420 (1962-01-01), None
patent: 102604 (1923-12-01), None
patent: 1 813 864 (1969-07-01), None
patent: 25 18 179 A1 (1976-11-01), None
patent: 44 38 841 C1 (1996-08-01), None
patent: 0 278 388 A2 (1988-08-01), None

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