Title:
CASCADED PROGRESSING CAVITY PUMP SYSTEM
Document Type and Number:
WIPO Patent Application WO1998020259
Kind Code:
A3
Abstract:
At least two progressing cavity pumps or pump sections are connected in series. The flow volume rate of the second pump or pump section is less than the flow volume rate of the first pump or pump section. If there are more than two pumps or pumps sections, the flow volume rate of the third pump or pump section would be less than the flow volume rate of the second pump or pump section, and so on. The cascade arrangement of progressing cavity pumps can be achieved by interconnecting separate pump assemblies end to end. The cascade arrangement of progressing cavity pump sections can be achieved by the attachment of the rotor/stator pairs of each pump section in series with suitable universal mechanisms and housings. Such a cascade arrangement of progressing cavity pumps or pump sections allows and compensates for the compressibility of the gas in the two-phase or multi-phase fluid being pumped, especially in pumping operations requiring high differential pressures.
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Inventors:
WILD ALAN G
MIRZA KAMRAN Z
CHANG SHELDON S L
MIRZA KAMRAN Z
CHANG SHELDON S L
Application Number:
PCT/US1997/016891
Publication Date:
October 08, 1998
Filing Date:
September 18, 1997
Export Citation:
Assignee:
ROBBINS & MYERS (US)
International Classes:
F01C1/30; F04B3/00; F04B23/00; F04C2/107; F04C11/00; F04C18/00; F04C23/00; F04C29/04; F04C; (IPC1-7): F04C/
Foreign References:
| DE2418967A1 | 1975-10-30 | |||
| US3535058A | 1970-10-20 | |||
| US3976400A | 1976-08-24 |
Other References:
See also references of EP 1003974A4
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