Centrifugal pump having magnet bearing

Details Centrifugal pump having magnet bearing Centrifugal pump having magnet bearing

1991-03-26

1992-07-07

Kwon, John T.

Rotary kinetic fluid motors or pumps

With shaft connected fluid force subjected thrust balancing...

415107, 4174241, F01D 300

Patent

active

051277921

ABSTRACT:
A cemtrifugal pump in which the thrust generated by an impeller is balanced by the operation of a balancing disc device. In the pump, a magnetic bearing is employed as an axial thrust bearing. The distance between the surface of a balancing disc and an axial displacement detecting surface which, together with the pump shaft, and the distance between such surface of a balancing disc seat is a fixed-side member which faces the balancing disc surface. The surface of a displacement sensor is another fixed-side member which faces the axial displacement detecting surface and are made equal to each other, or the latter distance is made slightly larger than the former distance. The neutral position of the magnetic thrust bearing is made to substantially coincide with the axial position of the rotator of the pump and is determined by the balancing disc device during running of the pump. By these arrangements, the position of the stator is determined by the balancing disc device during normal operation of the pump, whereas the position is determined by the magnetic thrust bearing when the pump is at rest or in a transient running state.

REFERENCES:
patent: 4057369 (1977-11-01), Isenberg et al.
patent: 4312628 (1982-01-01), Yamamura
patent: 4683111 (1987-07-01), Helm et al.
The Active Magnetic Bearing Enables Optimum Damping of Flexible Rotor, The American Society of Mechanical Engineers, 84-GT-117.
The Application of Active Magnetic Bearings to Natural Gas Pipeline Compressor, The American Society of Mechanical Engineers, 86-GT-61.

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