Centrifugal pumps having rotatable pole rings supported in contactless bearings

Claim 2

A centrifugal pump having: a. a first pole ring for producing a rotating magnetic field where said first pole ring includes a plurality of poles distributed over a first surface thereof part of which is inclined with respect to a major axis of said pump; b. a second rotatable pole ring having the same plurality of poles as said first pole ring distributed over a second surface thereof part of which is inclined with respect to a major axis of said pump and to the same degree of inclination as said first surface, said first and second surfaces being spaced from each other to form a gap therebetween and the gap effecting a closure of magnetic circuits between adjacent poles; c. a separating wall in said gap for hermetically sealing said first pole ring from said second pole ring; d. means for introducing a fluid under pressure between said separating wall and said second pole ring to form a fluid bearing film to support the second pole ring axially with respect to said first pole ring; and e. impeller blading operatively connected to said second pole ring for imparting a force on a fluid to be pumped by said pump.

Claim 3

A centrifugal pump according to claim 1 having in addition an electric motor operatively connected to said first pole ring for rotating the same and casing means which join with said separating wall to form a hermetic chamber enclosing said motor and first pole ring.

Claim 4

A centrifugal pump according to claim 1 wherein said impeller blading is connected to said second pole ring by means of a spindle mounting an impeller body carrying the blading and wherein the fluid inlet sides of the blading face the second pole ring.

Claim 5

A centrifugal pump according to claim 3 wherein the pump has a fluid inlet extending radially into the pump adjacent the inlet sides of said blading and a fluid outlet extending coaxially outwardly of the pump on the side opposite the impeller body from the second pole ring.

Claim 6

A centrifugal pump according to claim 1 wherein said first pole ring is stationary and comprises an annular body having thereon a winding which body and winding are hermetically sealed in part by said separating wall, wherein the inlet for the pump passes axially through said annular body, and wherein said second pole ring mounts said impeller blading.

Claim 7

A centrifugal pump having: a. a first pole ring for producing a rotating magnetic field where said first pole ring includes a plurality of poles distributed over a first surface thereof part of which is inclined with respect to a major axis of said pump; b. a second rotatable pole ring having the same plurality of poles as said first pole ring distributed over a second surface thereof part of which is inclined with respect to a major axis of said pump and to the same degree of inclination as said first surface, said first and second surfaces being spaced from each other to form a gap therebetween and the gap effecting a closure of magnetic curcuits between adjacent poles; c. means for introducing a fluid under pressure between said first pole ring and said second pole ring to form a fluid bearing film to support the second pole ring axially with respect to said first pole ring; and d. impeller blading operatively connected to said second pole ring for imparting a force on a fluid to be pumped by said pump; and e. an inlet for the pump passing axially through said first pole ring, so that the magnetic attracting forces between the pole rings and the hydraulic forces both draw the second pole ring against the first pole ring.

Claim 8

A centrifugal pump having: a. a first pole ring for producing a rotating magnetic field where said first pole ring includes a plurality of poles distributed over a first surface thereof part of which is inclined with respect to a major axis of said pump; b. a second rotatable pole ring having the same plurality of poles as said first pole ring distributed over a second surface thereof part of which is inclined with respect to a major axis of said pump and to the same degree of inclination as said first surface, said first and second surfaces being spaced from each other to form a gap therebetween and the gap effecting a closure of magnetic curcuits between adjacent poles; c. means for introducing a fluid under pressure between said first pole ring and said second pole ring to form a fluid bearing film to support the second pole ring axially with respect to said first pole ring; and d. impeller blading operatively connected to said second pole ring for imparting a force on a fluid to be pumped by said pump; and e. an inlet for the pump passing axially through said first pole ring, so that the magnetic attracting forces between the pole rings and the hydraulic forces both draw the second pole ring against the first pole ring.

Claim 9

A centrifugal pump having: a. A first pole ring for producing a rotating magnetic field where said pole ring includes a plurality of poles distributed over a first surface thereof part of which is inclined with respect to a major axis of said pump; b. A second pole ring having the same plurality of poles as said first pole ring distributed over a second surface thereof part of which is inclined to the same degree of inclination as said first surface, said first and second surfaces being spaced from each other to form a first gap therebetween and the first gap effecting a closure of magnetic circuits between adjacent poles; c. Impeller blading operatively connected to said second pole ring for imparting a force on a fluid to be pumped by said pump; d. A heavy ring operatively connected to said second pole ring having a curved surface thereon and where said heavy ring, impeller blading and second pole ring together form a rotatable unit; e. A curved support surface opposite said curved surface and spaced therefrom when said pump is running by a second gap; f. An inlet of said pump passing axially through a part of said rotating unit; and g. Means for introducing a fluid under pressure into a gap which is situated on the same side as the inlet to form a fluid bearing film to support said rotatable unit axially with respect to said first pole ring.

Claim 10

A centrifugal pump having: a. A first pole ring for producing a rotating magnetic field where said pole ring includes a plurality of poles distributed over a first surface thereof part of which is inclined with respect to a major axis of said pump; b. A second pole ring having the same plurality of poles as said first pole ring distributed over a second surface thereof part of which is inclined to the same degree of inclination as said first surface, said first and second surfaces being spaced from each other to form a first gap therebetween and the first gap effecting a closure of magnetic circuits between adjacent poles; c. Impeller blading operatively connected to said second pole ring for imparting a force on a fluid to be pumped by said pump; d. A heavy ring operatively connected to said second pole ring having a curved surface thereon and where said heavy ring, impeller blading and second pole ring together form a rotatable unit; e. A curved support surface opposite said curved surface and spaced therefrom when said pump is running by a second gap; f. An inlet of said pump passing axially through a part of said rotating unit; and g. Means for introducing a fluid under pressure into a gap which is situated on the same side as the inlet to form a fluid bearing film to support said rotatable unit axially with respect to said first pole ring.

Claim 11

A centrifugal pump according to claim 7 wherein said inlet passes axially of the second pole ring and where the means for introducing a fluid under pressure introduces the fluid into said first gap whereby the rotatable unit is supported axially with respect to said first pole ring against the magnetic and hydraulic forces tending to move the rotatable unit towards the first pole ring.