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A self lubricating bearing for use submerged in cryogenic fluids. The self-lubricating bearing comprises hardened races, hardened rolling elements and polymeric retainers or cages. More particularly, the rolling elements may be hardened balls, and the polymeric cages may include PEEK. In particular

A self lubricating bearing for use submerged in cryogenic fluids. The self-lubricating bearing comprises hardened races, hardened rolling elements and polymeric retainers or cages. More particularly, the rolling elements may be hardened balls, and the polymeric cages may include PEEK. In particular a bearing for self lubricated use in seal-less, magnetic drive pump for pumping fluids at very low temperatures and cryogenic temperatures below about -100 degrees centigrade such as liquid nitrogen and temperatures below about -150 degrees centigrade such as liquefied natural gas (LNG). An environment for submerged use of such a bearing may be a magnetically driven cryogenic pump with a housing having an intake and exhaust with a back plate mounted therein in which a shaft is journaled in self-lubricating bearings having hardened stainless steel or ceramic balls, stainless steel races and polymeric retainers or cages for retaining the balls for rolling contact in the races. An impeller is mounted on the first end and a first magnet is mounted on the second end of the shaft.

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A self lubricating bearing for use submerged in cryogenic fluids. The self-lubricating bearing comprises hardened races, hardened rolling elements and polymeric retainers or cages. More particularly, the rolling elements may be hardened balls, and the polymeric cages may include PEEK. In particular

A self lubricating bearing for use submerged in cryogenic fluids. The self-lubricating bearing comprises hardened races, hardened rolling elements and polymeric retainers or cages. More particularly, the rolling elements may be hardened balls, and the polymeric cages may include PEEK. In particular a bearing for self lubricated use in seal-less, magnetic drive pump for pumping fluids at very low temperatures and cryogenic temperatures below about -100 degrees centigrade such as liquid nitrogen and temperatures below about -150 degrees centigrade such as liquefied natural gas (LNG). An environment for submerged use of such a bearing may be a magnetically driven cryogenic pump with a housing having an intake and exhaust with a back plate mounted therein in which a shaft is journaled in self-lubricating bearings having hardened stainless steel or ceramic balls, stainless steel races and polymeric retainers or cages for retaining the balls for rolling contact in the races. An impeller is mounted on the first end and a first magnet is mounted on the second end of the shaft. ng apparatus according to claim 1, wherein the outer circumferential ends of the channels define wall portions and the wall portions are shorter than the inner circumferential ends as measured from the base portions of the channels. 3. A fluid heating apparatus according to claim 1, wherein substantially no shields are provided toward the outer circumferential ends of the channels. 4. A fluid heating apparatus according to claim 1, wherein the base portion defines the lowest point of the surface between the outer circumferential end and the inner circumferential end. 5. A fluid heating apparatus according to claim 1, wherein a substantially curved surface is defined between the outer circumferential end and the inner circumferential end. 6. A fluid heating apparatus according to claim 1, wherein blades are disposed on opposing sides of the rotor body. 7. A fluid heating apparatus according to claim 1, wherein the blades radially extend from a rotational center of the rotor body towards an outer circumference of the rotor body. 8. A fluid heating apparatus as in claim 1, wherein the rotor housing defines an actuation chamber arranged and constructed to pressurize fluid drawn into the rotor housing by rotating the rotor body. 9. A fluid heating apparatus according to claim 8, wherein the rotor housing further comprises: a suction port arranged and constructed to draw fluid into the actuation chamber; and a dividing wall disposed along an inner wall of the rotor housing in order to separate the discharge port from the suction port, the discharge port being in communication with pressurized fluid disposed within the actuation chamber. 10. (Amended) A fluid heating apparatus according to claim 9, wherein a clearance is defined between the dividing wall and the blades of the rotor, whereby pressurized fluid near the discharge port leaks through the clearance towards the suction port. 11. A fluid heating apparatus according to claim 10, wherein the outer circumferential ends of the channels define wall portions and the wall portions are shorter than the inner circumferential ends as measured from the base portions of the channels, substantially no shields are provided toward the outer circumferential ends of the channels, a substantially curved surface is defined between the outer circumferential end and the inner circumferential end, blades are disposed on opposing sides of the rotor body and the blades radially extend from a rotational center of the body towards an outer circumference of the rotor body. 12. A method for heating a fluid, comprising: pressurizing fluid drawn into the rotor housing of claim 11; discharging pressurized fluid via the discharge port to the throttle of claim 12; and throttling the pressurized fluid, whereby internal energy of the pressurized fluid is converted into heat. 13. A method for heating a fluid, comprising: pressurizing fluid drawn into the rotor housing of claim 1; discharging pressurized fluid via the discharge port to the throttle of claim 1; and throttling the pressurized fluid, whereby internal energy of the pressurized fluid is converted into heat. 14. An apparatus, comprising: a pump comprising a rotor housing having a suction port, a discharge port and an actuation chamber defined between the suction port and the discharge port, wherein a rotor is rotatably supported within the actuation chamber, a plurality of blades are defined on at least one circumferential surface of the rotor and a channel is defined between each two adjacent blades, each channel having a base portion, an inner circumferential end and an outer circumferential end, wherein the inner circumferential end is longer than the outer circumferential end as measured from the base portion; and a throttle comprising a throttle valve in communication with the discharge port, the throttle valve being arranged and constructed to brake pressurized fluid discharged via the discharge port and thereby increase