Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having multiple parts releasably clamped
Patent
1991-12-20
1993-10-26
Kwon, John T.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing having multiple parts releasably clamped
4151821, 4151991, F01D 2524
Patent
active
052560333
ABSTRACT:
A multistage centrifugal pump has a plurality of series-connected interstage casings of pressed sheet metal housing respective impellers. Each of the interstage casings includes a cylindrical side wall for housing an impeller, a bottom wall joined to the cylindrical side wall and extending around an inlet for the impeller, and a return blade attached to the bottom wall remotely from the impeller. The bottom wall has a central region projecting conically or spherically radially inwardly toward the impeller by a distance corresponding to the extent to which the bottom wall is deformable under an interstage pressure difference. The deformation of the bottom wall that is developed under the pressure generated by the impeller is borne only by the casing body itself without affecting the welded spots, which are prevented from being ripped off under stresses that would otherwise concentrate on the welded spots.
REFERENCES:
patent: 4549849 (1985-10-01), Jensen et al.
patent: 4877372 (1989-10-01), Jensen
patent: 4923367 (1990-05-01), Zimmer
European Pat. 267,445, May 1988.
Ebara Corporation
Kwon John T.
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