Proposal of Unique Process Pump with Floating Type Centrifugal Impeller (Preliminarily Report: Axial Thrust of Impeller with Driving Shaft)

The authors have proposed the unique centrifugal pump, in which the impeller dose not have the driving shaft but is driven by the magnetic induction, namely Lorentz force, without the stay. Then, the rotating posture of the impeller is not stable, just like UFO. To make the rotating posture of the i...

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Bibliographic Details
Published in:Proceedings of the 10th International Conference 2009-10, Vol.1225, p.304-315
Main Authors: Kawashima, Ryunosuke, Kanemoto, Toshiaki, Sakamoto, Kengo, Uno, Mitsuo
Format: Article
Language:English
Subjects:
Axial flow pumps
Blades
Casing (material)
Centrifugal pumps
Distortion
Driving
Fluctuation
Fluid dynamics
Fluid flow
Hydraulics
Impellers
Leaks
Lorentz force
Magnetic induction
Pipe
Posture
Proposals
Pumps
Rotating
Shrouds
Steady state
Thrust
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Summary:The authors have proposed the unique centrifugal pump, in which the impeller dose not have the driving shaft but is driven by the magnetic induction, namely Lorentz force, without the stay. Then, the rotating posture of the impeller is not stable, just like UFO. To make the rotating posture of the impeller stable irrespective of the operating condition, the pressure in the impeller casing was investigated experimentally while the impeller rotates at the steady state, as the preliminarily stage. The pressure, as well known, fluctuates periodically in response to the blade number. Besides, the pressure on the impeller shrouds decreases with the increase of the gap between the front shroud and the suction cover where the water leaks to the suction pipe, and is distorted in the peripheral direction. Such pressure conditions contribute directly to the hydraulic force acting on the impeller. The unstable behaviors of the impeller are induced from the above hydraulic forces, which change unsteadily in the radial and the peripheral directions in the impeller casing. The forces are affected by not only the operating condition but also the rotating posture of the impeller.
ISSN:0094-243X