Grooved shaft for a magnetic-drive centrifugal pump

Details Grooved shaft for a magnetic-drive centrifugal pump Grooved shaft for a magnetic-drive centrifugal pump

1995-01-26

1997-06-24

Thorpe, Timothy

Pumps

Motor driven

Electric or magnetic motor

417370, 415176, F04B 1700, F04B 5318

Patent

active

056412754

ABSTRACT:
The grooved shaft for a magnetic-drive centrifugal pump preferably has an axial groove with a semi-elliptical or U-shaped groove cross section. Adjoining the axial groove is a flat area which is tapered tangentially relative to a substantially cylindrical shaft area. The grooved shaft optimally has a front shaft radius and a rear shaft radius, wherein the front shaft radius is smaller than the rear shaft radius such that the front shaft radius may be oriented near an impeller intake to decrease hydraulic flow resistance. Meanwhile, the rear shaft radius provides increased axial and radial load capacity for the grooved shaft. In practice, the grooved shaft is incorporated into a magnetic-drive centrifugal pump and the groove is statically oriented in a position of minimal radial loading. In the centrifugal pump, the grooved shaft forms an immobile channel for the internal circulation of pumped fluid about the product-lubricated wearing surfaces so the grooved shaft and an associated bearing are amply lubricated or cooled.

REFERENCES:
patent: 2120914 (1938-06-01), Vogel
patent: 2830541 (1958-04-01), Higgins et al.
patent: 4013384 (1977-03-01), Oikawa
patent: 4047847 (1977-09-01), Oikawa
patent: 4710111 (1987-12-01), Kubo
patent: 5184945 (1993-02-01), Chi-Wei
patent: 5248245 (1993-09-01), Behnke et al.
patent: 5269664 (1993-12-01), Buse
patent: 5320431 (1994-06-01), Kallenberger
patent: 5320432 (1994-06-01), Fox
patent: 5464333 (1995-11-01), Okada et al.

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