Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
1999-06-29
2001-08-28
Thorpe, Timothy S. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
Reexamination Certificate
active
06280157
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to fluid pumps and more particularly to high-pressure-rise, low-flow-rate charging pumps for providing make-up fluids to closed high-pressure systems.
For applications such as charging pumps for supplying make-up fluid to closed high-pressure systems, it is necessary to employ pumps capable of supplying relatively low-flow-rate fluid at high pressure. It is desirable for such pumps to be highly leak resistant because of the types of fluids and the pressures involved. The most favored method of providing such leak resistance is by employment of sealless pumps. Sealless pumps often incorporate motors located inside the pump case, so there are no shaft pass-throughs to seal against leakage of the pumped fluid.
Current high-pressure-rise, low-flow-rate pumps are typically positive-displacement reciprocating pumps which are highly efficient, but, because of the necessary rotary-to-reciprocating motion converters, are large and difficult to configure as sealless pumps. Thus, when environmental considerations are important, the sealless feature becomes more important and positive-displacement reciprocating pumps become less practical due to the difficulty of adapting a reciprocating drive to a sealless pumpage-tolerant coupling mechanism. This is a serious drawback since many sealless applications rely on product lubricated bearings to reduce friction and wear in the pump equipment.
Although rotodynamic pumps are less efficient than are positive displacement pumps, they have the advantage of being much more amenable to sealless designs than are reciprocating positive displacement designs. Rotodynamic pumps are also more easily configured as sealless multi-stage machines, which permits their use in very high pressure applications. Thus, reciprocating positive displacement pumps, although more efficient than single-stage rotodynamic pumps, lose some of that efficiency advantage when multi-stage sealless features are employed.
The foregoing illustrates limitations known to exist in present low-flow-rate, high-pressure-rise pumps. Thus, it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention, this is accomplished by providing a fluid pump comprising; a housing and having at least one fluid passage extending circumferentially between at least one fluid inlet port and at least one fluid discharge port, said ports being separated by an interruption of said fluid passage located upstream of each said inlet and downstream of each said discharge; at least one rotatable rotatable rotor disk rotatably supported within said housing and having a plurality of substantially radially oriented impeller vanes situated about the periphery thereof within said circumferentially extending fluid passage, the disk also having a plurality of permanent magnets embedded therein in a circular locus about an axis rotation of said disk, said magnets being sealed against pumped fluid; at least one set of motor windings encased in at least one wall of said housing axially adjacent the permanent magnets in said at least one regenerative rotor disk and also sealed against pumped fluid; and means for controlling a flow of electricity through said motor windings to rotatably drive said rotor disk.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
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patent: 6068454 (2000-05-01), Gaston
Flowserve Management Company
Killworth, Gottman, Hagan & Schaeff, L.L.P
Rodriguez William H
Thorpe Timothy S.
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