Electric motor pump with magnetic coupling and thrust...

Pumps – Motor driven – Electric or magnetic motor

Reexamination Certificate

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Details

C417S410100, C417S423120

Reexamination Certificate

active

06213736

ABSTRACT:

FIELD OF INVENTION
This invention relates to an electric motor pump for corrosive, electric conductive, cryogenic and/or hazardous liquids which is submerged in the liquid.
BACKGROUND OF INVENTION
Submerged electric motor pumps for corrosive, electric conductive, cryogenic and/or hazardous liquids have a high rate of failure, because small leaks and cracks between the electric windings of the stator and the liquid cause chemical or physical disintegration of the electric motor. The bearings of the centrifugal pump have a high rate of failure, due to the above listed agressive liquids and the high centrifugal pump thrust.
The objective of the invention is to generate a submerged electric motor pump with the ability to operate in corrosive, electric conductive, cryogenic and/or hazardous liquids with a low rate of failure.
SUMMARY OF THE INVENTION
The proposed inventive solution suggests a centrifugal pump in a pump housing and an electric motor in a separate motor housing, and the power is transmitted through a magnetic coupling, whereby a thrust equalizing device is mounted on the rotating pump shaft.
The motor housing is connected to a tubular device and the power cable is inside the tubular device and on one end connected to the electric motor stator and on the other end to the electric power grid.
The motor housing and the tubular device contain an inert fluid like nitrogen or helium gas under higher pressure than the surrounding liquid.


REFERENCES:
patent: 2969741 (1961-01-01), Wright et al.
patent: 2996994 (1961-08-01), Wright
patent: 3074347 (1963-01-01), Clymer
patent: 4435132 (1984-03-01), Haesloop et al.
patent: 4752194 (1988-06-01), Weinen et al.
patent: 4998863 (1991-03-01), Klaus
patent: 5165872 (1992-11-01), Fleischmann et al.
patent: 5297940 (1994-03-01), Buse
patent: 5501583 (1996-03-01), Nagoaka et al.

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