Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having multiple parts releasably clamped
Patent
1991-12-20
1993-08-10
Kwon, John T.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing having multiple parts releasably clamped
415200, F04D 2960
Patent
active
052343170
ABSTRACT:
A multistage centrifugal pump has a plurality of series-connected interstage casings of pressed sheet steel housing respective impellers. Each of the interstage casings includes a central cylindrical side wall, a casing end wall, a first cylindrical wall integrally extending from an end of the central cylindrical side wall and joined to the casing end wall, the first cylindrical wall serving as a male member of a spigot joint, and a second cylindrical wall integrally extending from an opposite end of the central cylindrical side wall and having a flange defining an end opening therein, the second cylindrical wall serving as a female member of a spigot joint. The central cylindrical side wall has an outside diameter larger than outside diameters of the first cylindrical wall and the flange. The interstage casing is formed by drawing and bulging, and is not machined to achieve the desired dimensional accuracy. Therefore, the interstage casing is free from deformations and dimensional errors which would otherwise tend to occur under forces that would be developed if the blank were fastened for machining, and stresses and heat that would be developed if the blank were machined.
REFERENCES:
patent: 4549849 (1945-10-01), Jensen et al.
patent: 4877372 (1989-10-01), Jensen
patent: 4923367 (1990-05-01), Zimmer
European Pat. 267,445 May 1988.
Ikeda Hideo
Kajiwara Ken-ichi
Kuroiwa Sou
Mori Kikuichi
Ebara Corporation
Kwon John T.
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