Pumps – Motor driven – Electric or magnetic motor
Patent
1976-08-02
1978-10-17
Husar, C. J.
Pumps
Motor driven
Electric or magnetic motor
64 28M, 192 84PM, 310156, 277DIG6, 4151981, 415214, 415DIG5, F04B 1700
Patent
active
041206185
ABSTRACT:
A glandless permanent magnetic centrifugal pump designed for a power input of about 10kW or more and a delivery head of between 2 and 10 bars having a pump casing containing an impeller assembly connected to an inner rotor journalled in the pump casing and carrying permanent bar magnets disposed parallel to the rotor axis via which it is driven magnetically by an outer motor-driven rotor generating a rotating magnetic field passing through an air gap which circumferentially surrounds the inner rotor and in which a gap tube extends around the inner rotor and is fixed to the pump housing to glandlessly close the interior thereof in a fluid-tight manner. All components which come in direct contact with the pumped fluid, particularly the pump casing, the impeller assembly including its shaft, and the inner rotor, and the gap tube, are made entirely of a temperature -- and/or acid-resistant synthetic plastics material, in which the permanent bar magnets of the inner rotor are completely embedded and have trapezoidal cross section, their side faces and end faces are tapered and inclined towards each other in the radially outward direction. Bearing material which imparts the hardness and frictional properties of ordinary bearings to the bearing surfaces is incorporated in the synthetic plastics material forming the bearing surfaces of the bearings of the impeller assembly and inner driven rotor.
REFERENCES:
patent: 2048161 (1936-07-01), Klaiber
patent: 2107260 (1938-02-01), Ihara
patent: 3194165 (1965-07-01), Sorlin
patent: 3237034 (1966-02-01), Krasnow
patent: 3238878 (1966-03-01), Martin
patent: 3249780 (1966-05-01), Ibrahim et al.
patent: 3304875 (1967-02-01), Copeland
patent: 3390291 (1968-06-01), Eberline et al.
patent: 3551067 (1970-12-01), Wissman
patent: 3576380 (1971-04-01), Sargeant
patent: 3647314 (1972-03-01), Laessig
patent: 3802804 (1974-04-01), Zimmermann
patent: 3932068 (1976-01-01), Zimmermann
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