Claims
- 1. A centrifugal pump comprising:
- a housing having an internal chamber with inlet and discharge ports;
- an impeller supported in said chamber for rotation about an axis, the impeller having a hub section having an axis about which it may rotate to pump a working fluid, the impeller having a central opening; first and second disk shaped shrouds supported from said tub section, at least one of said shrouds containing permanent magnets; and a plurality of pumping channels defined by a plurality of impeller blades projecting outwardly from the hub section in a common plane between said first and second shrouds so as to rotate in a common plane normal to said axis;
- a motor stator coil for rotatably driving said impeller, the stator coil being disposed adjacent said shrouds so as to form a gap between the stator coil and the shroud for receiving a small quantity of pumped working fluid, the stator coil further having a central opening therein, the working fluid passing through the stator coil central opening and through the impeller central opening;
- a means for axial hydrodynamic balancing of said impeller, the means comprising a ring disposed in said gap for restricting the flow of the small quantity of pumped working fluid;
- a means for inducing flow of a working fluid toward the pumping channels from opposite directions, the means for inducing flow of a working fluid to the pumping channels comprising an opening between the hub section and each shroud and an inducer in the opening, the inducer comprising a pumping member which is separate from the impeller; and
- a recirculation passage adjacent each inducer.
- 2. A centrifugal pump comprising:
- a housing having an internal chamber with inlet and discharge ports;
- an impeller supported in said chamber for rotation about an axis, the impeller having a hub section; at least one disk shaped shroud containing permanent magnets;
- a plurality of pumping channels defined by a plurality of impeller blades projecting outwardly from the hub section and fixed to a face of the shroud; and means for supplying fluid to the pumping channels, said means comprising at least one opening between the hub section and the shroud; and one or more inducers in said opening, said inducers comprising pumping members which are separate from the impeller blades; and
- a recirculation passage adjacent each inducer.
- 3. A centrifugal pump comprising:
- a housing having an internal chamber connecting inlet and discharge ports;
- a disk shaped impeller having permanent magnets disposed therein, said impeller being supported within said chamber for rotation about an axis to pump a working fluid;
- a motor stator coil for rotatably driving said impeller, said stator coil being disposed at a side of said impeller so as to form a gap between the stator coil and the impeller for receiving a small quantity of pumped working fluid; and
- a means for axial hydrodynamic balancing of said impeller, the means comprising a ring disposed in said gap for restricting flow of the small quantity of pumped working fluid therethrough.
- 4. A centrifugal pump as claimed in claim 3 and further comprising a second motor stator coil and a second ring, said impeller being disposed between the first and second motor stator coils and said second ring being disposed in a second gap between said second motor stator coil and said impeller for restricting the flow of pumped working fluid therethrough.
Parent Case Info
This application is a continuation of application Ser. No. 593,655, filed Oct. 4, 1990.
US Referenced Citations (17)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0378251 |
Jul 1990 |
EPX |
3905278 |
Sep 1989 |
DEX |
591315 |
Jul 1925 |
FRX |
63-302198 |
Apr 1989 |
JPX |
PCTUS8000191 |
Mar 1979 |
WOX |
582036 |
Nov 1946 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
593655 |
Oct 1990 |
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