EP0844397A1 - Moineau pump - Google Patents

Moineau pump Download PDF

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Publication number
EP0844397A1
EP0844397A1 EP97402779A EP97402779A EP0844397A1 EP 0844397 A1 EP0844397 A1 EP 0844397A1 EP 97402779 A EP97402779 A EP 97402779A EP 97402779 A EP97402779 A EP 97402779A EP 0844397 A1 EP0844397 A1 EP 0844397A1
Authority
EP
European Patent Office
Prior art keywords
stator
rotor
gear pump
pump according
gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97402779A
Other languages
German (de)
French (fr)
Other versions
EP0844397B1 (en
Inventor
Jean-Paul Papin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PCM Pompes
Original Assignee
PCM Pompes
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by PCM Pompes filed Critical PCM Pompes
Publication of EP0844397A1 publication Critical patent/EP0844397A1/en
Application granted granted Critical
Publication of EP0844397B1 publication Critical patent/EP0844397B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/04—Thermal properties
    • F05C2251/042—Expansivity
    • F05C2251/044—Expansivity similar

Definitions

  • the present invention relates to improvements brought to gear pumps, or Moineau pumps, comprising two internal helical gears, one to the other, the internal helical gear which is rotating (rotor) having one tooth less than the helical gear which is fixed (stator).
  • the rotor is made of high strength steel, coated with chrome to withstand abrasion; he is suspended at the end of a drill string which drives it in rotation.
  • the stator is made of molded elastomer encased in a steel tube; it hangs at the end of a train of tubes surrounding the above-mentioned train of rods. The seal between rotor and stator is obtained by giving the rotor slightly larger than the minimum diameter of the stator.
  • the pumps thus constituted give full satisfaction in pumping wells where the temperature does not exceed about 140 ° C.
  • the object of the invention is essentially to remedy to this disadvantage and to propose an improved arrangement Sparrow pump clean to operate properly in a wide temperature range which can extend up to temperature significantly above 140 ° C, which is therefore usable in particular for oil extraction in wells deep.
  • a gear pump or Moineau pump improved in accordance with the invention is characterized basically in that the rotor and the stator are made up of respective materials having coefficients respective thermal expansion leading to respective expansions of the rotor and stator such as approximately constant play is maintained between the rotor and the stator over a range of ambient temperatures between about 15 ° C and about 300 ° C.
  • the improved arrangement according to the invention is based on the fact that, due to the appropriate choice of constituent materials respectively of the rotor and the stator, the transverse and longitudinal dimensions of the rotor and the transverse and longitudinal dimensions respectively of the stator cavity move in the same direction and of same order of magnitude during thermal variations (i.e. that the transverse dimension of the rotor and the dimension transverse of the stator cavity increase significantly of the same order of magnitude when the temperature increases and decreases by roughly the same order of magnitude when the temperature decreases).
  • the pump therefore remains functionally operational in the presence of ambient thermal variations when the rotor and stator are made of respective materials having coefficients of thermal expansion such that a predetermined functional clearance between rotor and stator is kept approximately over a wide range of temperature, ranging from around 15 ° C (room temperature rotor assembly in the stator in the workshop) up to a ambient temperature during operation of the order of 300 ° C.
  • the operational temperature range of the pump can be from about 40 ° C to about 250 ° C.
  • stator the two materials constituting the stator and the rotor respectively, so that the game is kept approximately constant between rotor and stator, have expansion coefficients thermal of the same order of magnitude, even relatively neighbors.
  • the rotor being metallic for possess sufficient mechanical strength it is desirable that the stator is also metallic.
  • the material of the rotor and the material constituting the stator are chosen so as to be compatible mechanically vis-à-vis friction problems and wear, and are therefore selected in accordance with the rules known to those skilled in the art.
  • a pair of preferentially suitable materials in the context of the invention is formed by 316 L steel, the coefficient of linear thermal expansion of which is 16.5 ⁇ 10 ⁇ 6 mm / ° / mm, to constitute the rotor and the bronze UE7 Pb6 Z4, whose coefficient of linear thermal expansion is 17 x 10 -6 mm / ° / mm, to constitute the stator.
  • a privileged (although not exclusive) area of use a gear pump or sparrow pump arranged in accordance with to the invention resides in petroleum extraction in deep well, with an ambient temperature at the bottom of wells can vary from about 40 ° C to about 250 ° C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

Gear pump or Moineau pump has two helicoidal gears inside each other. The internal gear is the rotor and has a one tooth less than the external gear which is fixed (the stator). The rotor and stator are made of materials with a thermal expansion coefficient such that the play between the two is approximately constant over a temperature range of between 15 and 300 degrees C.

Description

La présente invention concerne des perfectionnements apportés aux pompes à engrenages, ou pompes Moineau, comportant deux engrenages hélicoïdaux intérieurs l'un à l'autre, l'engrenage hélicoïdal interne qui est rotatif (rotor) ayant une dent de moins que l'engrenage hélicoïdal externe qui est fixe (stator).The present invention relates to improvements brought to gear pumps, or Moineau pumps, comprising two internal helical gears, one to the other, the internal helical gear which is rotating (rotor) having one tooth less than the helical gear which is fixed (stator).

Il est connu d'utiliser de telles pompes dans l'industrie pétrolière, pour l'extraction du pétrole hors d'un puits. Le rotor est constitué en acier à haute résistance, revêtu de chrome pour supporter l'abrasion ; il est suspendu à l'extrémité d'un train de tiges qui l'entraíne en rotation. Le stator est constitué en élastomère moulé enchassé dans un tube d'acier ; il est suspendu à l'extrémité d'un train de tubes entourant le susdit train de tiges. L'étanchéité entre rotor et stator est obtenue en donnant au rotor un diamètre légèrement supérieur au diamètre minimum du stator.It is known to use such pumps in petroleum industry, for the extraction of petroleum from a well. The rotor is made of high strength steel, coated with chrome to withstand abrasion; he is suspended at the end of a drill string which drives it in rotation. The stator is made of molded elastomer encased in a steel tube; it hangs at the end of a train of tubes surrounding the above-mentioned train of rods. The seal between rotor and stator is obtained by giving the rotor slightly larger than the minimum diameter of the stator.

Les pompes ainsi constituées donnent toute satisfaction dans des puits de pompage dans lesquels la température n'excède pas environ 140°C.The pumps thus constituted give full satisfaction in pumping wells where the temperature does not exceed about 140 ° C.

Par contre, dans les puits dans lesquels la température dépasse 140°C, les pompes agencées de façon traditionnelle comme indiqué ci-dessus ne peuvent plus être employées, d'une part, parce que l'élastomère constitutif du stator ne peut pas supporter de telles températures sans être endommagé et, d'autre part, en raison de la dilatation de l'élastomère qui est supérieure à celle du métal et qui entraíne un serrage excessif du rotor dans le stator.However, in wells where the temperature exceeds 140 ° C, pumps arranged in the traditional way as indicated above can no longer be used, on the one hand, because the elastomer constituting the stator cannot withstand such temperatures without be damaged and, on the other hand, due to expansion elastomer which is superior to that of metal and which causes excessive tightening of the rotor in the stator.

L'invention a essentiellement pour but de remédier à cet inconvénient et de proposer un agencement perfectionné de pompe Moineau propre à fonctionner de façon correcte dans une large plage de température pouvant s'étendre jusqu'à une température notablement supérieure à 140°C, et qui soit donc utilisable notamment pour l'extraction pétrolière en puits profond. The object of the invention is essentially to remedy to this disadvantage and to propose an improved arrangement Sparrow pump clean to operate properly in a wide temperature range which can extend up to temperature significantly above 140 ° C, which is therefore usable in particular for oil extraction in wells deep.

A cette fin, une pompe à engrenage ou pompe Moineau perfectionnée conformément à l'invention se caractérise essentiellement en ce que le rotor et le stator sont constitués en des matériaux respectifs ayant des coefficients de dilatation thermique respectifs conduisant à des dilatations respectives du rotor et du stator telles qu'un jeu approximativement constant soit maintenu entre le rotor et le stator sur une plage de température ambiante comprise entre environ 15°C et environ 300°C.To this end, a gear pump or Moineau pump improved in accordance with the invention is characterized basically in that the rotor and the stator are made up of respective materials having coefficients respective thermal expansion leading to respective expansions of the rotor and stator such as approximately constant play is maintained between the rotor and the stator over a range of ambient temperatures between about 15 ° C and about 300 ° C.

L'agencement perfectionné conforme à l'invention repose sur le fait que, en raison du choix approprié des matériaux constitutifs respectivement du rotor et du stator, les dimensions transversale et longitudinale du rotor et respectivement les dimensions transversale et longitudinale de la cavité du stator évoluent dans les mêmes sens et du même ordre de grandeur lors de variations thermiques (c'est-à-dire que la dimension transversale du rotor et la dimension transversale de la cavité du stator augmentent sensiblement du même ordre de grandeur lorsque la température croít et diminue sensiblement du même ordre de grandeur lorsque la température décroít).The improved arrangement according to the invention is based on the fact that, due to the appropriate choice of constituent materials respectively of the rotor and the stator, the transverse and longitudinal dimensions of the rotor and the transverse and longitudinal dimensions respectively of the stator cavity move in the same direction and of same order of magnitude during thermal variations (i.e. that the transverse dimension of the rotor and the dimension transverse of the stator cavity increase significantly of the same order of magnitude when the temperature increases and decreases by roughly the same order of magnitude when the temperature decreases).

La pompe reste donc fonctionnellement opérationnelle en présence de variations thermiques ambiantes lorsque le rotor et le stator sont constitués en des matériaux respectifs ayant des coefficients de dilatation thermique tels qu'un jeu fonctionnel prédéterminé entre rotor et stator soit conservé de façon approximative sur une large plage de température, allant d'environ 15°C (température ambiante d'assemblage du rotor dans le stator en atelier) jusqu'à une température ambiante en fonctionnement de l'ordre de 300°C.The pump therefore remains functionally operational in the presence of ambient thermal variations when the rotor and stator are made of respective materials having coefficients of thermal expansion such that a predetermined functional clearance between rotor and stator is kept approximately over a wide range of temperature, ranging from around 15 ° C (room temperature rotor assembly in the stator in the workshop) up to a ambient temperature during operation of the order of 300 ° C.

En pratique, et notamment pour l'utilisation plus particulièrement envisagée de la pompe agencée conformément à l'invention dans le domaine de l'extraction pétrolière en puits profond, la plage de température opérationnelle de la pompe peut être d'environ 40°C à environ 250°C.In practice, especially for more use particularly envisaged of the pump arranged in accordance to the invention in the field of petroleum extraction in deep well, the operational temperature range of the pump can be from about 40 ° C to about 250 ° C.

Il résulte de ce qui précède que les deux matériaux constitutifs respectivement du stator et du rotor doivent, pour que soit conservé approximativement constant le jeu entre rotor et stator, posséder des coefficients de dilatation thermique du même ordre de grandeur, voire relativement voisins. Il en résulte que, le rotor étant métallique pour posséder une résistance mécanique suffisante, il est souhaitable que le stator soit lui aussi métallique.It follows from the above that the two materials constituting the stator and the rotor respectively, so that the game is kept approximately constant between rotor and stator, have expansion coefficients thermal of the same order of magnitude, even relatively neighbors. It follows that, the rotor being metallic for possess sufficient mechanical strength it is desirable that the stator is also metallic.

Dans ces conditions, un choix préféré de matériaux est donné dans le tableau qui suit, dans lequel le coefficient de dilatation thermique linéaire est exprimé en mm/°/mm x 10-6 pour chacun : acier Z 30 C 13 11,8 acier 316 L 16,5 fonte FGS 415 11 fonte FGS Ni 20 16 fonte FGS Ni30 Cr 1 12 bronze UE7 Pb 6 Z 4 17 Under these conditions, a preferred choice of materials is given in the table below, in which the coefficient of linear thermal expansion is expressed in mm / ° / mm x 10 -6 for each: steel Z 30 C 13 11.8 steel 316 L 16.5 cast iron FGS 415 11 FGS Ni 20 cast iron 16 FGS Ni30 Cr 1 cast iron 12 bronze UE7 Pb 6 Z 4 17

Le matériau constitutif du rotor et le matériau constitutif du stator sont choisis de façon à être compatibles mécaniquement vis-à-vis des problèmes de frottement et d'usure, et sont donc sélectionnés en conformité avec les règles connues de l'Homme de Métier.The material of the rotor and the material constituting the stator are chosen so as to be compatible mechanically vis-à-vis friction problems and wear, and are therefore selected in accordance with the rules known to those skilled in the art.

En pratique, la Demanderesse estime qu'actuellement un couple de matériaux préférentiellement appropriés dans le cadre de l'invention est formé par l'acier 316 L, dont le coefficient de dilatation thermique linéaire est de 16,5 x 10-6 mm/°/mm, pour constituer le rotor et le bronze UE7 Pb6 Z4, dont le coefficient de dilatation thermique linéaire est de 17 x 10-6 mm/°/mm, pour constituer le stator.In practice, the Applicant considers that currently a pair of preferentially suitable materials in the context of the invention is formed by 316 L steel, the coefficient of linear thermal expansion of which is 16.5 × 10 −6 mm / ° / mm, to constitute the rotor and the bronze UE7 Pb6 Z4, whose coefficient of linear thermal expansion is 17 x 10 -6 mm / ° / mm, to constitute the stator.

Le rotor et le stator peuvent être fabriqués par tout procédé et tous moyens connus de l'Homme de Métier. Pour ce qui est plus particulièrement du stator, on pourra avantageusement avoir recours à l'un des deux procédés de fabrication suivants :

  • le stator peut être fabriqué par compression extérieure d'une pièce massive autour d'un poinçon ayant le profil définitif de la forme intérieure (cavité) du stator;
  • le stator est constitué d'éléments individuellement obtenus par fluotournage et raccordés entre eux par des manchons.
The rotor and the stator can be manufactured by any process and any means known to those skilled in the art. As regards more particularly the stator, one can advantageously have recourse to one of the following two manufacturing processes:
  • the stator can be manufactured by external compression of a solid piece around a punch having the final profile of the internal shape (cavity) of the stator;
  • the stator consists of elements individually obtained by flow spinning and connected together by sleeves.

Comme il ressort clairement de ce qui précède, un domaine privilégié (bien que non exclusif) d'utilisation d'une pompe à engrenages ou pompe Moineau agencée conformément à l'invention réside dans l'extraction pétrolière en puits profond, avec une température ambiante en fond de puits pouvant varier d'environ 40°C à environ 250°C.As is clear from the above, a privileged (although not exclusive) area of use a gear pump or sparrow pump arranged in accordance with to the invention resides in petroleum extraction in deep well, with an ambient temperature at the bottom of wells can vary from about 40 ° C to about 250 ° C.

Claims (7)

Pompe à engrenages, ou pompe Moineau, comportant deux engrenages hélicoïdaux intérieurs l'un à l'autre, l'engrenage hélicoïdal interne qui est rotatif (rotor) ayant une dent de moins que l'engrenage hélicoïdal externe qui est fixe (stator),
caractérisée en ce que le rotor et le stator sont constitués en des matériaux respectifs ayant des coefficients de dilatation thermique respectifs conduisant à des dilatations respectives du rotor et du stator telles qu'un jeu approximativement constant soit maintenu entre le rotor et le stator sur une plage de température ambiante comprise entre environ 15°C et environ 300°C.Gear pump, or Moineau pump, comprising two helical internal gears to one another, the internal helical gear which is rotary (rotor) having one less tooth than the external helical gear which is fixed (stator),
characterized in that the rotor and the stator are made of respective materials having respective coefficients of thermal expansion leading to respective expansions of the rotor and the stator such that an approximately constant clearance is maintained between the rotor and the stator over a range ambient temperature between about 15 ° C and about 300 ° C. Pompe à engrenages selon la revendication 1, caractérisée en ce que le matériau constitutif du rotor et le matériau constitutif du stator sont choisis de façon mécaniquement compatible parmi l'acier Z 3 OC 13, l'acier 316L, la fonte FGS 415, la fonte FGS Ni 20, la fonte FSG Ni 30 Crl et le bronze UE 7 Pb 6Z4.Gear pump according to claim 1, characterized in that the material of the rotor and the material of the stator are chosen so mechanically compatible among Z 3 OC 13 steel, steel 316L, FGS 415 cast iron, FGS Ni 20 cast iron, FSG Ni cast iron 30 Crl and bronze UE 7 Pb 6Z4. Pompe à engrenages selon la revendication 2, caractérisée en ce que le rotor est constitué en acier 316L et le stator en bronze spécial UE 7 Pb 6Z4.Gear pump according to claim 2, characterized in that the rotor is made of 316L steel and the special bronze stator UE 7 Pb 6Z4. Pompe à engrenages selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le jeu sensiblement constant entre rotor et stator est maintenu sur une plage de température d'environ 40°C à environ 250°C.Gear pump according to any one of Claims 1 to 3, characterized in that the clearance substantially constant between rotor and stator is maintained on a temperature range from about 40 ° C to about 250 ° C. Pompe à engrenages selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le stator est fabriqué par compression extérieure d'une pièce massive autour d'un poinçon ayant le profil définitif de la forme intérieure du stator.Gear pump according to any one of Claims 1 to 4, characterized in that the stator is manufactured by external compression of a massive piece around a punch with the final shape profile inside of the stator. Pompe à engrenages selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le stator est constitué par des éléments individuellement obtenus par fluotournage et raccordés entre eux par des manchons.Gear pump according to any one of Claims 1 to 4, characterized in that the stator is made up of elements individually obtained by flow turning and connected together by sleeves. Utilisation d'une pompe à engrenages selon l'une quelconque des revendications 1 à 6, pour l'extraction de produits pétroliers en puits profond.Use of a gear pump according to one any one of claims 1 to 6, for the extraction of petroleum products in deep wells.
EP97402779A 1996-11-21 1997-11-19 Moineau pump Expired - Lifetime EP0844397B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9614227 1996-11-21
FR9614227A FR2756018B1 (en) 1996-11-21 1996-11-21 HELICOIDAL GEAR PUMP

Publications (2)

Publication Number Publication Date
EP0844397A1 true EP0844397A1 (en) 1998-05-27
EP0844397B1 EP0844397B1 (en) 2003-05-14

Family

ID=9497865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97402779A Expired - Lifetime EP0844397B1 (en) 1996-11-21 1997-11-19 Moineau pump

Country Status (8)

Country Link
US (1) US6082980A (en)
EP (1) EP0844397B1 (en)
AR (1) AR010071A1 (en)
AT (1) ATE240459T1 (en)
CA (1) CA2221487C (en)
DE (1) DE69721943T2 (en)
ES (1) ES2198539T3 (en)
FR (1) FR2756018B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008036511A1 (en) 2008-08-05 2010-02-11 Netzsch-Mohnopumpen Gmbh Eccentric spiral pump has stator and rotor which rotates eccentrically to stator, and rotor has less number of teeth than stator, where rotor and stator are partially or completely made of metal or metal alloy
US8523545B2 (en) 2009-12-21 2013-09-03 Baker Hughes Incorporated Stator to housing lock in a progressing cavity pump

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10141863A1 (en) * 2000-08-28 2002-03-14 Dana Corp Hydraulic displacement pump has inner and outer rotor with different number of teeth and different heat expansion coefficients
FR2826407B1 (en) * 2001-06-21 2004-04-16 Pcm Pompes SPRAY PUMP STATOR AND PROCESS FOR ITS MANUFACTURE
US8182252B2 (en) * 2007-10-30 2012-05-22 Moyno, Inc. Progressing cavity pump with split stator
US8215014B2 (en) * 2007-10-31 2012-07-10 Moyno, Inc. Method for making a stator
DE102011086013A1 (en) 2011-11-09 2013-05-16 Bayerische Motoren Werke Aktiengesellschaft Drive system for motor vehicle e.g. motor car, has damping device with damping element that is coupled with shaft, for reduction of rotational irregularities, such that damping element is decoupled partially from shaft
DE102011086008B4 (en) 2011-11-09 2021-02-25 Bayerische Motoren Werke Aktiengesellschaft Drive system for a motor vehicle with a controllable damping element
DE102011086014B4 (en) 2011-11-09 2021-02-25 Bayerische Motoren Werke Aktiengesellschaft Drive system for a motor vehicle with a temperature-controlled damping element
EP2998584B1 (en) 2014-09-16 2017-04-05 NETZSCH Pumpen & Systeme GmbH Stator for an eccentric screw pump, eccentric screw pump, and a method for manufacturing a stator
US10184462B2 (en) 2015-11-06 2019-01-22 Caterpillar Inc. Drive assembly and pump assembly arrangement for cryogenic pump

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Publication number Priority date Publication date Assignee Title
GB2120729A (en) * 1982-05-21 1983-12-07 Mono Pumps Ltd Helical gear pump
EP0297960A2 (en) * 1987-06-30 1989-01-04 Institut Français du Pétrole Fluid-pumping apparatus in a well

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US3622254A (en) * 1969-06-20 1971-11-23 Precision Scient Co Pump
US4008015A (en) * 1975-11-03 1977-02-15 Eaton Corporation Rotor-stator gear set
JPS5379108A (en) * 1976-12-24 1978-07-13 Toyota Motor Corp Rotor housing for a rotary engine
US5772418A (en) * 1995-04-07 1998-06-30 Tochigi Fuji Sangyo Kabushiki Kaisha Screw type compressor rotor, rotor casting core and method of manufacturing the rotor
US5876192A (en) * 1996-11-08 1999-03-02 Ford Global Technologies, Inc. Differential expansion control assembly for a pump
US5797734A (en) * 1996-11-26 1998-08-25 Chrysler Corporation Pump for hot and cold fluids

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120729A (en) * 1982-05-21 1983-12-07 Mono Pumps Ltd Helical gear pump
EP0297960A2 (en) * 1987-06-30 1989-01-04 Institut Français du Pétrole Fluid-pumping apparatus in a well

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008036511A1 (en) 2008-08-05 2010-02-11 Netzsch-Mohnopumpen Gmbh Eccentric spiral pump has stator and rotor which rotates eccentrically to stator, and rotor has less number of teeth than stator, where rotor and stator are partially or completely made of metal or metal alloy
DE102008036511B4 (en) * 2008-08-05 2015-04-30 Netzsch Pumpen & Systeme Gmbh Cavity Pump
US8523545B2 (en) 2009-12-21 2013-09-03 Baker Hughes Incorporated Stator to housing lock in a progressing cavity pump

Also Published As

Publication number Publication date
CA2221487A1 (en) 1998-05-21
ES2198539T3 (en) 2004-02-01
DE69721943D1 (en) 2003-06-18
DE69721943T2 (en) 2004-02-19
AR010071A1 (en) 2000-05-17
ATE240459T1 (en) 2003-05-15
FR2756018A1 (en) 1998-05-22
US6082980A (en) 2000-07-04
EP0844397B1 (en) 2003-05-14
FR2756018B1 (en) 1999-01-22
CA2221487C (en) 2004-09-28

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