Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having multiple parts releasably clamped
Patent
1992-11-13
1993-08-03
Look, Edward K.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing having multiple parts releasably clamped
4151991, 4151721, 277136, 277166, 384295, 384906, F01D 2516
Patent
active
052323420
ABSTRACT:
A high pressure multi-stage centrifugal pump with an axially split casing (10) and a number of impellers (14) carried by a drive shaft (12) has inter-stage bushings (24) and rings (22) for sealing each side of each impeller. Each bushing (24) or ring (22) is conventionally prevented from rotating by a radial pin protruding from the lower half of the casing (10) into an axial slot in the periphery of the bushing or ring. The pin is necessarily small and is liable to shear, difficult to engage in the slot and, in cases where the bushing (24) or ring (22) is diametrically split, does not allow rotation of the lower half for its removal without lifting the shaft (12). To avoid all these disadvantages, without introducing any risk of leakage, a tangential pin (32) is fitted in a blind hole (34) in the casing (10) so that its exposed end (37) is flush with the joint face (28) of the casing and abuts against a shoulder ( 44) formed by a recess (38) in the periphery of the bushing (24) or ring (22). This tangential pin (32) can be larger than the known radial pin and is subjected to compression, not shear.
REFERENCES:
patent: 2085457 (1937-06-01), Westerhouse
patent: 2465930 (1949-03-01), Robinson
patent: 3265001 (1966-08-01), Deters
patent: 3383142 (1968-05-01), Scott
patent: 3861825 (1975-01-01), Blom
patent: 4017127 (1977-04-01), Smith et al.
patent: 4738548 (1988-04-01), Zloch et al.
patent: 4800057 (1989-01-01), Rabe
David Brown Engineering Limited
Lee Michael S.
Look Edward K.
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