Pump

Claim 2

A pump which comprises a cup-shaped main housing, a shaft rotatably supported in the closed end of said main housing, a cup-shaped rotor in said main housing having the closed end thereof adjacent the closed end of the main housing and secured to said shaft for co-rotation, a cup-shaped inner housing projecting through the open end of said cup-shaped rotor into closely spaced relation with the closed end of said rotor and having an outturned flange around the open end thereof secured to the open end of said main housing, an inner rotor projecting through the open end of said inner cup-shaped housing into closely spaced relation with the closed end of said inner housing, a pump casing overlying the open end of said inner housing and secured to the open end of said main housing, said pump casing having an axial inlet and a circumferential outlet, a pump impeller in said pump casing having an inlet registering with the casing inlet and an outlet discharging to the casing circumferential outlet, means fixedly mounting said pump impeller on said inner rotor, a main conical bearing surrounding a portion of said inner rotor and supported by said inner housing in the open end thereof rotatably supporting said inner rotor in said inner housing, an auxiliary spring loaded conical bearing carried by the closed end of said inner housing and projecting into said inner rotor to cooperate with the main conical bearing to support the inner rotor, said inner housing hermetically sealing pump fluid from said main housing, said inner housing and said main and auxiliary bearings receiving fluid from said pump casing, and magnets carried by the inner periphery of the shaft mounted rotor and the outer periphery of the inner rotor providing a magnetic field coupling the rotors for co-rotation whereby rotation of the shaft will drive the pump impeller.

Claim 3

A pump and drive assembly adapted for pumping corrosive and toxic liquids without leakage or damage to the drive which comprises a cup-shaped main housing, a drive shaft rotatably mounted in the closed end of said main housing, a cup-shaped rotor having the closed end thereof mounted on said shaft adjacent the closed end of the main housing and an open end adjacent the open end of the main housing, a cup-shaped inner housing projecting into the cup-shaped rotor with its closed end adjacent the closed end of the rotor and an outturned flange around its open end bottomed on the open end of the main housing, an inner rotor projecting into the open end of said inner housing into close spaced relation with the closed end of the inner housing, said inner rotor having a hub portion projecting beyond the open end of the inner housing, a bearing carried by the outturned flange of said inner housing surrounding said hub and rotatably mounting the inner rotor in the inner housing, a centrifugal pump casing bottomed on the outer flange of said inner housing and secured to said main housing, an impeller in said pump casing mounted on the hub of said inner rotor adjacent said bearing, permanent magnet means secured to the inner periphery of the cup-shaped rotor supported by said shaft, cooperating permanent magnet means secured to the periphery of said inner rotor in alignment with the first mentioned magnet means and means venting the interior of the pump casing to the bearing and the interior of the inner housing to flow fluid through the bearing and inner housing.

Claim 4

A pump and drive assembly adapted for pumping corrosive and toxic liquids without leakage or damage to the drive which comprises a cup-shaped main housing, a drive shaft rotatably mounted in the closed end of said main housing, a cup-shaped rotor having the closed end thereof mounted on said shaft adjacent the closed end of the main housing and an open end adjacent the open end of the main housing, a cup-shaped inner housing projecting into the cup-shaped rotor with its closed end adjacent the closed end of the rotor and an outturned flange around its open end bottomed on the open end of the main housing, an inner rotor projecting into the open end of said inner housing into close spaced relation with the closed end of the inner housing, said inner rotor having a hub portion projecting beyond the open end of the inner housing, a bearing carried by the outturned flange of said inner housing surrounding said hub and rotatably mounting the inner rotor in the inner housing, a centrifugal pump casing bottomed on the outer flange of said inner housing and secured to said main housing, an impeller in said pump casing mounted on the hub of said inner rotor adjacent said bearing, permanent magnet means secured to the inner periphery of the cup-shaped rotor supported by said shaft, cooperating permanent magnet means secured to the periphery of said inner rotor in alignment with the first mentioned magnet means and means venting the interior of the pump casing to the bearing and the interior of the inner housing to flow fluid through the bearing and inner housing.

Claim 5

A centrifugal impeller pump suitable for pumping corrosive and toxic fluids and a drive for said pump protected from said fluids which comprises a main housing, an outer rotor in said main housing, a shaft supported by the main housing for driving said outer rotor, a cup-shaped inner housing projecting into said main housing and surrounded by said outer rotor, an inner rotor having a hollow core projecting into said inner housing, a pump casing overlying said inner housing, means uniting the pump casing to the main housing and clamping the inner housing therebetween, a first self-centering conical bearing carried by said inner housing surrounding and supporting the hollow core of said inner rotor, a second self-centering conical bearing carried by the inner housing projecting into said hollow core of the inner rotor and cooperating with the first bearing to rotatably mount the inner rotor in the inner housing, spring means acting on said second bearing to take up wear on both bearings, a pump impeller in said pump casing keyed on the hollow core of said inner rotor, said first and second bearings having bearing surfaces communicating with the interior of the pump casing to receive fluid therefrom, a first permanent magnet means secured to the inner periphery of said outer rotor around said inner housing, a second permanent magnet means secured to the periphery of said inner rotor around said hollow core thereof and aligned with said first magnet means, and said first and second magnet means being nested in closely spaced relation separated only by said inner housing whereby rotation of the shaft will drive the impeller through a magnetic field between the first and second magnet means, the bearings supporting the inner rotor will be lubricated by fluid from the pump casing and the drive for the outer rotor will be isolated from the pump fluid.

Claim 6

A centrifugal impeller pump suitable for pumping corrosive and toxic fluids and a drive for said pump protected from said fluids which comprises a main housing, an outer rotor in said main housing, a shaft supported by the main housing for driving said outer rotor, a cup-shaped inner housing projecting into said main housing and surrounded by said outer rotor, an inner rotor having a hollow core projecting into said inner housing, a pump casing overlying said inner housing, means uniting the pump casing to the main housing and clamping the inner housing therebetween, a first self-centering conical bearing carried by said inner housing surrounding and supporting the hollow core of said inner rotor, a second self-centering conical bearing carried by the inner housing projecting into said hollow core of the inner rotor and cooperating with the first bearing to rotatably mount the inner rotor in the inner housing, spring means acting on said second bearing to take up wear on both bearings, a pump impeller in said pump casing keyed on the hollow core of said inner rotor, said first and second bearings having bearing surfaces communicating with the interior of the pump casing to receive fluid therefrom, a first permanent magnet means secured to the inner periphery of said outer rotor around said inner housing, a second permanent magnet means secured to the periphery of said inner rotor around said hollow core thereof and aligned with said first magnet means, and said first and second magnet means being nested in closely spaced relation separated only by said inner housing whereby rotation of the shaft will drive the impeller through a magnetic field between the first and second magnet means, the bearings supporting the inner rotor will be lubricated by fluid from the pump casing and the drive for the outer rotor will be isolated from the pump fluid.

Claim 7

The pump of claim 1 wherein the inner rotor is hollow and has a projecting hub portion at one end, the main conical bearing surrounds the hub portion, and the auxiliary conical bearing projects into the hollow interior at the other end of the inner rotor.

Claim 8

The pump of claim 2 wherein the inner rotor has a bore therethrough, radial flanges extending therefrom receiving magnetic means therebetween and an auxiliary bearing carried by the inner housing projects into said bore in supporting relation therewith.

Claim 9

The pump of claim 2 including a spring loaded auxiliary conical bearing for the inner rotor taking up wear of the main bearing.

Claim 10

The pump of claim 2 wherein the beariNg has conical bearing surfaces decreasingly tapering toward the closed end of the inner housing, a second bearing projects into the inner rotor from the closed end of the inner housing and has conical bearing surfaces decreasingly tapering toward the open end of the inner housing, and spring means act on the second beearing to urge the bearing surfaces of both bearings into bearing contact for rotatably supporting the inner rotor from the inner housing.

Claim 11

The pump of claim 3 wherein the bearing surfaces are grooved to distribute the pump fluid therethrough.