US 4,392,786 AGranted

Electromagnetic induction pump

OwnerJury F. Merenkov, Vladimir D. Egorov +2inventors

InventorsJury F. Merenkov, Vladimir D. Egorov, Valentin G. Stepanov, Igor V. Popkov

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Abstract

An electromagnetic induction pump comprises an open magnetic circuit with an excitation winding. Installed in the air gap of the magnetic circuit is a duct for the flow of an electrically conductive liquid wherein electric current is induced. The pump further comprises a means for electrical continuity outside the air gap of the magnetic circuit. This means for electrical continuity is in electrical contact with the conductive liquid being pumped and partially embraces the magnetic circuit. At least the magnetic circuit portions adjoining the duct have a length l, in the direction of the liquid flow, which is defined by the expression: ##EQU1## where .sigma.=the specific conductivity of the conductive liquid being pumped; .mu..sub.o =the magnetic permeability of the conductive liquid being pumped; and .omega.=the angular frequency of the alternating current source feeding the excitation winding, and provides a nearly exponential decrease of the magnetic induction in the duct along the length l, in the direction of the conductive liquid flow, to the value determined by the given length l.

Claims12

Dependent claims

An electromagnetic induction pump comprising:

an open magnetic circuit;
an excitation winding provided on said magnetic circuit;
a source of alternating current connected to said excitation winding;
a duct for the flow of an electrically conductive liquid being pumped and situated in the air gap of said magnetic circuit;
a means for electric continuity positioned outside of said air gap and embracing portions of said magnetic circuit at an outlet end of said duct relative to the direction of flow, and providing a path for the electric current induced in said conductive liquid to flow outside said air gap of said magnetic circuit, which means is in electrical contact with said conductive liquid and partially embraces said magnetic circuit;
at least portions of said magnetic circuit adjoining said duct having a length l, in the direction of the liquid flow, which is defined by the expression:
##EQU14## where .sigma.=the specific conductivity of the conductive liquid being pumped;
.mu..sub.o =the magnetic permeability of the conductive liquid being pumped;
and
.omega.=the angular frequency of the alternating current source feeding the excitation winding,
and provides a nearly exponential decrease of the magnetic induction in said duct along the length l, in the direction of the liquid flow, to the value determined by the given length l.

8 more elements

An electromagnetic induction pump, comprising:

a first three-pole open magnetic circuit;
a three-phase excitation winding provided on said magnetic circuit;
a three-phase alternating current source connected to said excitation winding;
a cylindrical duct for the flow of an electrically conductive liquid being pumped and situated in the air gap of said three-pole open magnetic circuit;
three busbars, each constituting a means for electrical continuity to provide a path for the electric current induced in said conductive liquid to flow outside said air gap of said magnetic circuit, said busbars being in electrical contact with said conductive liquid and partially embracing that respective portion of said magnetic circuit which adjoins said duct at the outlet, as regards the direction of the conductive liquid flow, end of said duct;
said portions of said magnetic circuit adjoining said cylindrical duct being spaced approximately equidistantly around the circumference thereof and having a length l in the direction of the conductive liquid flow which is defined by the expression:
##EQU15## where .sigma.=the specific conductivity of the conductive liquid being pumped;
.mu..sub.o =the magnetic permeability of the conductive liquid being pumped;
and
.omega.=the angular frequency of the alternating current source feeding the excitation winding, and provides a nearly exponential decrease of the magnetic induction in said duct along the length l, in the direction of the liquid flow, to the value determined by the given length l;
said busbars being electrically interconnected in order to set up in said duct identical magnetic fields of decreasing induction spaced 120.degree. apart with respect to time.

8 more elements

Dependencies are inferred from the claim text.