Pumps – Motor driven – Axial thrust balancing means for rotary pump and motor
Patent
1990-06-11
1991-09-03
Smith, Leonard E.
Pumps
Motor driven
Axial thrust balancing means for rotary pump and motor
417368, 417370, 4174239, F04B 3900
Patent
active
050448960
ABSTRACT:
A split tube centrifugal pump comprises a pump casing divided into a pump space and a motor space, an impeller driving a conveying fluid in the pump casing, a vertically disposed shaft in the casing, the shaft being hollow and including an axial channel therein, a rotor including a channel therein, and a partition separating the pump space from the motor space. The partition includes a first aperture through which the shaft passes and a second aperture. The conveying fluid circulates between the pump space and the motor space in a circuit comprising the first aperture in the partition, the channel in the rotor, and the channel in the shaft. In a particularly preferred embodiment of the invention, the split tube centrifugal pump further comprises a filter disposed upstream or downstream of the first aperture in the partition, and a slide ring sealing associated with the second aperture and through which the vertical shaft passes.
REFERENCES:
patent: 1998604 (1935-04-01), Belden
patent: 2738919 (1956-03-01), Rusch et al.
patent: 2809590 (1957-10-01), Brown
patent: 2855139 (1958-10-01), Weibel
patent: 3220350 (1965-11-01), White
patent: 3288073 (1966-11-01), Pezzillo
patent: 3318253 (1967-05-01), Campolong
patent: 3790309 (1974-07-01), Volz
patent: 4047847 (1977-09-01), Oikawa
patent: 4065231 (1977-12-01), Litzenberg
patent: 4502697 (1985-03-01), Heinl
Smith Leonard E.
Szczecina Jr. Eugene L.
Wilo-Werk GmbH & Co. Pumpen - und Apparatebau
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