EP3797223A1 - Stator element of a progressive cavity pump and progressive cavity pump - Google Patents

Stator element of a progressive cavity pump and progressive cavity pump

Info

Publication number
EP3797223A1
EP3797223A1 EP19730401.7A EP19730401A EP3797223A1 EP 3797223 A1 EP3797223 A1 EP 3797223A1 EP 19730401 A EP19730401 A EP 19730401A EP 3797223 A1 EP3797223 A1 EP 3797223A1
Authority
EP
European Patent Office
Prior art keywords
stator element
relief
reinforcing tube
stator
cylindrical portion
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
EP19730401.7A
Other languages
German (de)
French (fr)
Other versions
EP3797223B1 (en
Inventor
Pierre Garnier
Eric OGER
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 Technologies SAS
Original Assignee
PCM Technologies SAS
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
Application filed by PCM Technologies SAS filed Critical PCM Technologies SAS
Publication of EP3797223A1 publication Critical patent/EP3797223A1/en
Application granted granted Critical
Publication of EP3797223B1 publication Critical patent/EP3797223B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F04C2/1073—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 where one member is stationary while the other member rotates and orbits
    • F04C2/1075—Construction of the stationary member
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/008—Pumps for submersible use, i.e. down-hole pumping
    • 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
    • F04C2240/00—Components
    • F04C2240/10—Stators
    • 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
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/802—Liners

Definitions

  • the present invention is in the field of progressive cavity pumps used in hydrocarbon pumping or deep well gas plants.
  • the present invention relates to a stator element of a progressive cavity pump and to a progressive cavity pump comprising one or more such stator elements.
  • Progressive cavity pumps include a stator and a helical rotor inserted into the stator.
  • the stator is generally constituted by a reinforcing tube made from a rigid material, typically metallic or composite.
  • the reinforcing tube is generally cylindrical and has a constant thickness.
  • An elastomer liner is attached to the inside of this reinforcing tube by means of a glue-type adhesive system.
  • This liner has a longitudinal helical recess receiving the helical rotor.
  • the helical rotor has a lobe less than the stator so that at the interface between the rotor and the stator sealed cavities are created. The rotation of the rotor in the stator causes the displacement of these cavities and thus allows a fluid to be pumped.
  • the elastomeric lining undergoes significant forces in the axial and orthoradial directions.
  • the bonding system applied between the reinforcing tube and the liner can be damaged, detached from the wall internal reinforcement tube and sometimes even detached or expelled from the reinforcing tube.
  • the delamination is particularly present at the ends of the reinforcing tubes, at the point where the elastomer liner stops permitting infiltration of the pumped fluid at the interface between the reinforcing tube and the liner.
  • Such a defect can result in complete destruction of the stator of the pump and loss of function when the liner is totally or partially disengaged from the inner wall of the reinforcing tube.
  • the object of the present invention is to provide a stator element having an elastomeric liner having a greater resistance to the forces, and in particular capable of withstanding both the orthoradial forces and the axial forces.
  • stator element of a pump with progressive cavities said stator element comprising:
  • An armature tube having a longitudinal axis A-A, an inner face and an outer face, and
  • the reinforcing tube has a substantially constant thickness and in that said portion of the reinforcing tube is deformed so that it comprises at least a first relief and a second relief, the first relief having the shape of a helical strip having a pitch to the right with respect to the longitudinal axis AA of the reinforcing tube, the second relief having the shape of a helical strip having a pitch to the left with respect to the longitudinal axis AA of the reinforcing tube, the first relief and the second relief joining in at least one section.
  • the stator element comprises one or more of the following characteristics:
  • the first relief and the second relief are joined in several sections, and wherein the intermediate areas between the first relief and the second relief have a shape of a polygon at least order 3.
  • the first relief and the second relief form grooves on the outer face of the portion of the reinforcing tube.
  • the elastomer liner has an outer face fixed to the inner face of the reinforcing tube and an inner face of helical shape having a pitch.
  • the pitch of the helical band of the first relief is identical to the pitch of the helical shape of the inner face of the elastomer liner.
  • the armature tube has at each end a cylindrical portion.
  • the stator element comprises at least one axial retaining ring fixed on the cylindrical portion of the stator element, said retaining ring having a generally U-shaped radial section capable of enclosing a portion of a longitudinal end of the liner. elastomer.
  • At least one inner face of an axial branch of the retaining ring has protrusions in the form of sawtooth.
  • the invention also relates to a progressive cavity pump comprising:
  • tubular section fitted, on one side, in said cylindrical portion of the first stator element and, on the other side, in said cylindrical portion of the second stator element, said tubular section being supported, on one side, against the retaining ring of the first stator element and, on the other side, against the retaining ring of the second stator element, said section tubular forming a stop adapted to prevent the axial displacement of the retaining rings.
  • the progressive cavity pump comprises one or more of the following characteristics:
  • the pump further comprises a tubular nozzle having a threaded portion and an opposite portion fitted into another cylindrical portion of the second stator element, said tubular tip forming a stop preventing the axial displacement of the retaining ring.
  • FIG. 1 is an exploded side view of a progressive cavity pump
  • FIG. 2 is a view in longitudinal section of a stator element according to a first embodiment of the invention
  • FIG. 3 is a perspective view of a portion of an armature tube of the stator element illustrated in FIG. 2;
  • FIG. 4 is a longitudinal sectional view of the reinforcing tube portion illustrated in FIG. 3;
  • FIG. 5 is a longitudinal sectional view of a portion of two stator elements according to a second embodiment of the invention, the two stator elements being partially assembled;
  • FIG. 6 is a cross-sectional view of the stator element illustrated in FIG. 5 along section plane VI-VI; and - Figure 7 is a longitudinal sectional view of an assembly of a portion of a stator element according to the second embodiment and a tubular nozzle.
  • the present invention relates to a stator element and a progressive cavity pump that can be used as a pump or as a drilling motor.
  • the progressive cavity pump 2 according to a first embodiment of the invention comprises a first 4, a second 6 and a third 8 stator elements, two tubular sections 10, 12, two tubular ends 14 , 16 and a helical rotor 18 rotatably mounted in the stator elements, the tubular sections and the tubular ends.
  • Each tubular section 10, 12 is fitted between two stator elements 4, 6 and 6, 8 and makes it possible to fix the stator elements to each other and to center them relative to each other.
  • the tubular ends 14, 16 are fitted at the free ends of the first 4 and the third 8 stator elements. They comprise a threaded portion 13 for fixing the pump 2 to another pump or to a casing of a pumping installation.
  • the first 4, the second 6 and the third 8 stator elements are identical. They may be implemented according to a first embodiment illustrated in FIGS. 2 to 4 or according to a second embodiment illustrated in FIGS. 5 to 7.
  • the first stator element 4 comprises a reinforcing tube 20 extending along a longitudinal axis AA, and an elastomeric liner 26 fixed in the tube of FIG. frame.
  • the reinforcing tube 20 comprises a deformed central portion 21 and, at each of its ends, a cylindrical portion 23 of circular base. It has an inner face 22 and an outer face 24.
  • the elastomeric liner 26 has an outer face 40 attached to the inner face 22 of the reinforcing tube, and an inner face 42 of helical shape having a pitch p1.
  • the central portion 21 of the reinforcing tube 20 has a substantially constant thickness e and is deformed so that it comprises a first relief 28 and a second relief 30.
  • the reliefs 28, 30 can be bumps or dents. They are for example obtained by knurling the inner face 22 or the outer face 24 of the central portion of the reinforcing tube.
  • the first 28 and the second 30 reliefs form on the inner face of the central portion of the reinforcing tube of the attachment elements for the elastomeric liner 26. These attachment elements prevent tearing thereof.
  • the first relief 28 has the shape of a helical band having a pitch to the right with respect to the longitudinal axis A-A of the reinforcing tube.
  • the second relief 30 has the shape of a helical band having a pitch to the left with respect to the longitudinal axis A-A of the reinforcing tube. Due to this helical shape and the fact that the pitch of the helical strips are reversed, the first 28 and second 30 reliefs prevent tearing of the elastomer liner irrespective of the direction of the forces applied thereto.
  • the connection between the inner face 22 of the reinforcing tube and the outer face 40 of the elastomer liner is more resistant to the axial and orthoradial forces generated during the rotation of the helical rotor 18.
  • the reliefs 28, 30 are constituted by depressions of the outer face 24 of the reinforcing tube. These depressions are called helical furrows 34 below. These spiral grooves 34 are in this example made by knurling the outer face 24 of the reinforcing tube. These helical grooves 34 form helical indentations 36 on the inner face 22 of the reinforcing tube.
  • the first 28 and the second 30 reliefs are joined in several sections 32.
  • Intermediate zones 38 situated between the first relief 28 and the second relief 30 have a concavity opposite to the concavity of the first 28 and second 30 reliefs.
  • the zones 38 form projections on the external face 24 of the reinforcing tube.
  • these intermediate zones 38 have the shape of a polygon of order 4.
  • the pitch p2 of the helicoid of the first relief 28 is identical to the pitch p1 of the helicoid of the inner face 42 of the elastomer liner.
  • the second and the third stator elements according to the first embodiment are identical to the first stator element and will not be described in detail.
  • the reliefs consist of protrusions which extend towards the outside of the anchoring tube and which form recesses on the side of the inner face of the reinforcing tube 20.
  • the reinforcing tube 20 is deformed so that it comprises a number of reliefs greater than two.
  • the pitch of the helicoid of the first relief 28 and the pitch of the helicoid of the second relief 30 is substantially equal to or greater than the length of the reinforcing tube 20 so that the first relief 28 and the second relief 30 join in a single section 32.
  • the zones 38 positioned between the first band and the second band have the shape of a polygon of order 3.
  • FIG. 5 represents a first 4 and a second 6 stator element partially assembled to the tubular section 10.
  • the first, second and third stator elements according to the second embodiment of the present invention are similar to the first, second and third stator elements according to the first embodiment with the exception of the existence of two retaining rings. fixed in each stator element.
  • the parts of the stator elements according to the second embodiment identical to the parts of the stator elements according to the first embodiment have the same references and will not be described a second time.
  • the retaining rings 44 of the first 4 and the second 6 stator elements are able to delay the infiltration of the fluid pumped between the reinforcing tube 20 and the elastomer liner 26. It retain the longitudinal ends of the elastomeric liner 26 against the inner face 22 of the reinforcing tube.
  • the retaining rings 44 are fixed in each cylindrical portion 23 of the reinforcing tube 20 coaxially with the longitudinal axis A-A.
  • the elastomer liner 26 is shaped by injecting a green elastomer mixture into the reinforcing tube 20 when it is provided with two retaining rings 44.
  • the retaining rings 44 have a U-shaped section adapted to encase a portion of the longitudinal end of the elastomeric liner 26.
  • the radial U-shaped section of the retaining rings has an outer axial branch 46, a radial branch central 48 and an inner axial branch 50.
  • the outer axial branch 46 is fixed on the inner face 22 of the cylindrical portion 23 of the reinforcing tube.
  • the central radial branch 48 forms an axial abutment for the tubular section 10 during assembly of the first 4 and the second 6 stator elements.
  • An inner face 52 of the inner axial branch 50 has protrusions 54 in the form of a saw tooth adapted to retain the elastomer of the liner 26.
  • the retaining rings 44 form stops preventing axial displacement of the elastomeric liner 26 and thus delay its tearing.
  • the tubular section 10 and the second stator element 6 are assembled and fixed together by applying a welding material at the chamfers 56, the tubular section 10 in turn forms a stop preventing the axial displacement of the retaining ring 44 of the first stator element and the retaining ring 44 of the second stator element.
  • the third stator element 8 is fixed to the tubular endpiece 16 by a weld 57.
  • the tubular endpiece 16 has a threaded portion 13 and an opposed portion 58 fitted into the cylindrical portion 23 of the second element 6.
  • the retaining ring 44 is in abutment against the tubular endpiece 16.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The invention relates to a stator element of a progressive cavity pump, the stator element including: a reinforcement tube (20) having a longitudinal axis (A-A), an inner face (22) and an outer face (24), and an elastomer lining attached to the inner face of the reinforcement tube. At least one portion of the reinforcement tube (20) has a substantially constant thickness (e) and said portion of the reinforcement tube (20) is deformed so that it comprises at least a first raised pattern (28) and a second raised pattern (30), the first raised pattern (28) being in the shape of a helical strip having a right-handed thread with respect to the longitudinal axis (A-A), the second raised pattern (30) being in the shape of a helical strip having a left-handed thread with respect to the longitudinal axis (A-A), the first and second raised patterns meeting in least at one section (32).

Description

Elément de stator d’une pompe à cavités progressives et  Stator element of a progressive cavity pump and
pompe à cavités progressives  progressive cavity pump
La présente invention se situe dans le domaine des pompes à cavités progressives utilisées dans des installations de pompage d’hydrocarbure ou de gaz en puits profond. The present invention is in the field of progressive cavity pumps used in hydrocarbon pumping or deep well gas plants.
En particulier, la présente invention se rapporte à un élément de stator d’une pompe à cavités progressives et à une pompe à cavités progressives comportant un tel élément de stator ou plusieurs.  In particular, the present invention relates to a stator element of a progressive cavity pump and to a progressive cavity pump comprising one or more such stator elements.
Les pompes à cavités progressives sont basées sur le principe Progressive cavity pumps are based on the principle
« Moineau », dit encore « capsulisme Moineau ». Ces pompes peuvent être utilisées en mode pompe (conversion d’énergie mécanique en énergie hydraulique) ou bien en mode « turbine » ou « motrice » (conversion d’énergie hydraulique en énergie mécanique) pour entraîner en rotation le trépan d’un moteur de forage de puits producteurs d’hydrocarbures. "Sparrow", still says "sparrow capsulism". These pumps can be used in pump mode (conversion of mechanical energy into hydraulic energy) or in "turbine" or "drive" mode (conversion of hydraulic energy into mechanical energy) to rotate the drill bit of a combustion engine. drilling hydrocarbon producing wells.
Les pompes à cavités progressives comprennent un stator et un rotor hélicoïdal inséré dans le stator.  Progressive cavity pumps include a stator and a helical rotor inserted into the stator.
Le stator est généralement constitué d’un tube d’armature réalisé à partir d’un matériau rigide, typiquement métallique ou composite. Le tube d’armature est généralement cylindrique et présente une épaisseur constante. Un chemisage en élastomère est fixé à l’intérieur de ce tube d’armature à l’aide d’un système d’adhérisation de type colle. Ce chemisage possède un évidemment longitudinal hélicoïdal recevant le rotor hélicoïdal. Le rotor hélicoïdal comporte un lobe de moins que le stator de telle sorte qu’à l’interface entre le rotor et le stator des cavités étanches sont créées. La rotation du rotor dans le stator entraîne le déplacement de ces cavités et permet ainsi de pomper un fluide.  The stator is generally constituted by a reinforcing tube made from a rigid material, typically metallic or composite. The reinforcing tube is generally cylindrical and has a constant thickness. An elastomer liner is attached to the inside of this reinforcing tube by means of a glue-type adhesive system. This liner has a longitudinal helical recess receiving the helical rotor. The helical rotor has a lobe less than the stator so that at the interface between the rotor and the stator sealed cavities are created. The rotation of the rotor in the stator causes the displacement of these cavities and thus allows a fluid to be pumped.
Dans des conditions d’utilisation extrêmes telles que par exemple des pressions importantes, de hautes températures, une forte abrasivité du fluide ou une vitesse de rotation importante du rotor, le chemisage en élastomère subit des efforts importants selon les directions axiale et orthoradiale. Sous l’effet combiné de ces différentes contraintes, le système d’adhérisation appliqué entre le tube d’armature et le chemisage peut être endommagé, décollé de la paroi interne du tube d’armature et parfois même détaché voire expulsé du tube d’armature. Under extreme operating conditions such as, for example, high pressures, high temperatures, high abrasivity of the fluid or a high rotational speed of the rotor, the elastomeric lining undergoes significant forces in the axial and orthoradial directions. Under the combined effect of these various constraints, the bonding system applied between the reinforcing tube and the liner can be damaged, detached from the wall internal reinforcement tube and sometimes even detached or expelled from the reinforcing tube.
Le décollement est particulièrement présent aux extrémités des tubes d’armature, à l’endroit où le chemisage en élastomère s’arrête autorisant une infiltration du fluide pompé à l’interface entre le tube d’armature et le chemisage. Un tel défaut peut entraîner une destruction complète du stator de la pompe et une perte de fonction lorsque le chemisage est totalement ou partiellement désolidarisé de la paroi interne du tube d’armature.  The delamination is particularly present at the ends of the reinforcing tubes, at the point where the elastomer liner stops permitting infiltration of the pumped fluid at the interface between the reinforcing tube and the liner. Such a defect can result in complete destruction of the stator of the pump and loss of function when the liner is totally or partially disengaged from the inner wall of the reinforcing tube.
Pour pallier à ce problème de décollement, il est connu, notamment par les documents US 201 1/0150685, CA 2762358, DE 3322095, de réaliser des rainures axiales ou des saillies axiales sur la paroi interne d’un tube d’armature de forme cylindrique. Le tube d’armature ne présente alors plus une épaisseur constante sur toute sa circonférence. Ces rainures axiales ou ces saillies axiales permettent de résister à des efforts orthoradiaux mais ne permettent pas de résister simultanément aux efforts axiaux.  To overcome this problem of separation, it is known, in particular from documents US 201 1/0150685, CA 2762358, DE 3322095, to produce axial grooves or axial projections on the inner wall of a tube of form reinforcement. cylindrical. The reinforcement tube then no longer has a constant thickness over its entire circumference. These axial grooves or axial projections can withstand orthoradial efforts but do not allow to simultaneously resist the axial forces.
Le but de la présente invention est de proposer un élément de stator ayant un chemisage en élastomère ayant une plus grande résistance aux efforts, et en particulier capable de résister à la fois aux efforts orthoradiaux et aux efforts axiaux. The object of the present invention is to provide a stator element having an elastomeric liner having a greater resistance to the forces, and in particular capable of withstanding both the orthoradial forces and the axial forces.
A cet effet, la présente invention a pour objet un élément de stator d’une pompe à cavités progressives, ledit élément de stator comportant :  For this purpose, the subject of the present invention is a stator element of a pump with progressive cavities, said stator element comprising:
• un tube d’armature ayant un axe longitudinal A-A, une face interne et une face externe, et  An armature tube having a longitudinal axis A-A, an inner face and an outer face, and
· un chemisage en élastomère fixé sur la face interne du tube d’armature,  · An elastomer liner attached to the inner face of the reinforcing tube,
caractérisé en ce qu’au moins une portion du tube d’armature présente une épaisseur sensiblement constante et en ce que ladite portion du tube d’armature est déformée de manière à ce qu’elle comprenne au moins un premier relief et un deuxième relief, le premier relief présentant la forme d’une bande hélicoïdale ayant un pas à droite par rapport à l’axe longitudinal A-A du tube d’armature, le deuxième relief présentant la forme d’une bande hélicoïdale ayant un pas à gauche par rapport à l’axe longitudinal A-A du tube d’armature, le premier relief et le deuxième relief se joignant en au moins un tronçon. characterized in that at least a portion of the reinforcing tube has a substantially constant thickness and in that said portion of the reinforcing tube is deformed so that it comprises at least a first relief and a second relief, the first relief having the shape of a helical strip having a pitch to the right with respect to the longitudinal axis AA of the reinforcing tube, the second relief having the shape of a helical strip having a pitch to the left with respect to the longitudinal axis AA of the reinforcing tube, the first relief and the second relief joining in at least one section.
Suivant des modes particuliers de réalisation, l’élément de stator comporte l'une ou plusieurs des caractéristiques suivantes : According to particular embodiments, the stator element comprises one or more of the following characteristics:
- Le premier relief et le deuxième relief se joignent en plusieurs tronçons, et dans lequel les zones intermédiaires situées entre le premier relief et le deuxième relief présentent une forme d’un polygone au moins d’ordre 3.  - The first relief and the second relief are joined in several sections, and wherein the intermediate areas between the first relief and the second relief have a shape of a polygon at least order 3.
- Le premier relief et le deuxième relief forment des sillons sur la face externe de la portion du tube d’armature.  - The first relief and the second relief form grooves on the outer face of the portion of the reinforcing tube.
- Le chemisage en élastomère présente une face externe fixée à la face interne du tube d’armature et une face interne de forme hélicoïdale ayant un pas. Le pas de la bande hélicoïdale du premier relief est identique au pas de la forme hélicoïdale de la face interne du chemisage en élastomère.  The elastomer liner has an outer face fixed to the inner face of the reinforcing tube and an inner face of helical shape having a pitch. The pitch of the helical band of the first relief is identical to the pitch of the helical shape of the inner face of the elastomer liner.
- Le tube d’armature comporte à chaque extrémité une portion cylindrique. - The armature tube has at each end a cylindrical portion.
L’élément de stator comporte au moins une bague de retenue axiale fixée sur la portion cylindrique de l’élément de stator, ladite bague de retenue ayant une section radiale de forme générale en U propre à enceindre une partie d’une extrémité longitudinale du chemisage en élastomère. The stator element comprises at least one axial retaining ring fixed on the cylindrical portion of the stator element, said retaining ring having a generally U-shaped radial section capable of enclosing a portion of a longitudinal end of the liner. elastomer.
- Au moins une face interne d’une branche axiale de la bague de retenue présente des protubérances en forme de dents de scie.  - At least one inner face of an axial branch of the retaining ring has protrusions in the form of sawtooth.
L’invention a également pour objet une pompe à cavités progressives comportant : The invention also relates to a progressive cavity pump comprising:
- un rotor hélicoïdal monté rotatif dans le chemisage en élastomère, a helical rotor rotatably mounted in the elastomer liner,
- au moins un premier et un deuxième éléments de stator conformes aux caractéristiques mentionnées ci-dessus, at least first and second stator elements conforming to the characteristics mentioned above,
- un tronçon tubulaire emmanché, d’un côté, dans ladite portion cylindrique du premier élément de stator et, de l’autre côté, dans ladite portion cylindrique du deuxième élément de stator, ledit tronçon tubulaire étant en appui, d’un côté, contre la bague de retenue du premier élément de stator et, de l’autre côté, contre la bague de retenue du deuxième élément de stator, ledit tronçon tubulaire formant une butée propre à empêcher le déplacement axial des bagues de retenue. a tubular section fitted, on one side, in said cylindrical portion of the first stator element and, on the other side, in said cylindrical portion of the second stator element, said tubular section being supported, on one side, against the retaining ring of the first stator element and, on the other side, against the retaining ring of the second stator element, said section tubular forming a stop adapted to prevent the axial displacement of the retaining rings.
Suivant des modes particuliers de réalisation, la pompe à cavités progressives comporte l'une ou plusieurs des caractéristiques suivantes : According to particular embodiments, the progressive cavity pump comprises one or more of the following characteristics:
- La pompe comporte en outre un embout tubulaire ayant une portion filetée et une portion opposée emmanchée dans une autre portion cylindrique du deuxième élément de stator, ledit embout tubulaire formant une butée empêchant le déplacement axial de la bague de retenue.  - The pump further comprises a tubular nozzle having a threaded portion and an opposite portion fitted into another cylindrical portion of the second stator element, said tubular tip forming a stop preventing the axial displacement of the retaining ring.
- La portion cylindrique du premier élément de stator, la portion cylindrique du deuxième élément de stator et le tronçon tubulaire sont fixés par soudage.  - The cylindrical portion of the first stator element, the cylindrical portion of the second stator element and the tubular section are fixed by welding.
- La portion cylindrique du deuxième élément de stator et l’embout tubulaire sont fixés par soudage. L’invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d’exemple et faite en se référant aux figures sur lesquelles :  - The cylindrical portion of the second stator element and the tubular nozzle are fixed by welding. The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the figures in which:
- la figure 1 est une vue éclatée de côté d’une pompe à cavités progressives ;  - Figure 1 is an exploded side view of a progressive cavity pump;
- la figure 2 est une vue en coupe longitudinale d’un élément de stator selon un premier mode de réalisation de l’invention ;  FIG. 2 is a view in longitudinal section of a stator element according to a first embodiment of the invention;
- la figure 3 est une vue en perspective d’une portion d’un tube d’armature de l’élément de stator illustré sur la figure 2 ;  FIG. 3 is a perspective view of a portion of an armature tube of the stator element illustrated in FIG. 2;
- la figure 4 est une vue en coupe longitudinale de la portion de tube d’armature illustrée sur la figure 3 ;  FIG. 4 is a longitudinal sectional view of the reinforcing tube portion illustrated in FIG. 3;
- la figure 5 est une vue en coupe longitudinale d’une partie de deux éléments de stator selon un second mode de réalisation de l’invention, les deux éléments de stator étant partiellement assemblés;  - Figure 5 is a longitudinal sectional view of a portion of two stator elements according to a second embodiment of the invention, the two stator elements being partially assembled;
- la figure 6 est une vue en coupe transversale de l’élément de stator illustré sur la figure 5 selon le plan de coupe VI-VI ; et - la figure 7 est une vue en coupe longitudinale d’un assemblage d’une partie d’un élément de stator selon le second mode de réalisation et d’un embout tubulaire. La présente invention concerne un élément de stator et une pompe à cavités progressives pouvant être utilisée comme pompe ou comme moteur de forage. FIG. 6 is a cross-sectional view of the stator element illustrated in FIG. 5 along section plane VI-VI; and - Figure 7 is a longitudinal sectional view of an assembly of a portion of a stator element according to the second embodiment and a tubular nozzle. The present invention relates to a stator element and a progressive cavity pump that can be used as a pump or as a drilling motor.
En référence à la figure 1 , la pompe à cavités progressives 2 selon un premier mode de réalisation de l’invention comporte un premier 4, un deuxième 6 et un troisième 8 éléments de stator, deux tronçons tubulaires 10, 12, deux embouts tubulaires 14, 16 et un rotor 18 hélicoïdal monté rotatif dans les éléments de stator, les tronçons tubulaires et les embouts tubulaires. Referring to Figure 1, the progressive cavity pump 2 according to a first embodiment of the invention comprises a first 4, a second 6 and a third 8 stator elements, two tubular sections 10, 12, two tubular ends 14 , 16 and a helical rotor 18 rotatably mounted in the stator elements, the tubular sections and the tubular ends.
Chaque tronçon tubulaire 10, 12 est emmanché entre deux éléments de stators 4, 6 et 6, 8 et permet de fixer les éléments de stator les uns aux autres et de les centrer les uns par rapport aux autres. Les embouts tubulaires 14, 16 sont emmanchés aux extrémités libres du premier 4 et du troisième 8 éléments de stator. Ils comprennent une portion filetée 13 permettant la fixation de la pompe 2 à une autre pompe ou à un carter d’une installation de pompage.  Each tubular section 10, 12 is fitted between two stator elements 4, 6 and 6, 8 and makes it possible to fix the stator elements to each other and to center them relative to each other. The tubular ends 14, 16 are fitted at the free ends of the first 4 and the third 8 stator elements. They comprise a threaded portion 13 for fixing the pump 2 to another pump or to a casing of a pumping installation.
Le premier 4, le deuxième 6 et le troisième 8 éléments de stator sont identiques. Ils peuvent être mis en œuvre selon un premier mode de réalisation illustré sur les figures 2 à 4 ou selon un deuxième mode de réalisation illustré sur les figures 5 à 7.  The first 4, the second 6 and the third 8 stator elements are identical. They may be implemented according to a first embodiment illustrated in FIGS. 2 to 4 or according to a second embodiment illustrated in FIGS. 5 to 7.
En référence à la figure 2 le premier élément de stator 4 selon le premier mode de réalisation comporte un tube d’armature 20 s’étendant le long d’un un axe longitudinal A-A, et un chemisage en élastomère 26 fixé dans le tube d’armature.  With reference to FIG. 2, the first stator element 4 according to the first embodiment comprises a reinforcing tube 20 extending along a longitudinal axis AA, and an elastomeric liner 26 fixed in the tube of FIG. frame.
Le tube d’armature 20 comprend une portion centrale déformée 21 et, à chacune de ses extrémités, une portion cylindrique 23 de base circulaire. Il présente une face interne 22 et une face externe 24.  The reinforcing tube 20 comprises a deformed central portion 21 and, at each of its ends, a cylindrical portion 23 of circular base. It has an inner face 22 and an outer face 24.
Le chemisage en élastomère 26 présente une face externe 40 fixée à la face interne 22 du tube d’armature, et une face interne 42 de forme hélicoïdale ayant un pas p1. En référence aux figures 3 et 4, la portion centrale 21 du tube d’armature 20 présente une épaisseur e sensiblement constante et est déformée de manière à ce qu’elle comprenne un premier relief 28 et un deuxième relief 30. Les reliefs 28, 30 peuvent être des bosses ou des enfoncements. Ils sont par exemple obtenus par moletage de la face interne 22 ou de la face externe 24 de la portion centrale du tube d’armature. Le premier 28 et le deuxième 30 reliefs forment sur la face interne de la portion centrale du tube d’armature des éléments d’accroche pour le chemisage en élastomère 26. Ces éléments d’accroche empêchent l’arrachage de celui-ci. The elastomeric liner 26 has an outer face 40 attached to the inner face 22 of the reinforcing tube, and an inner face 42 of helical shape having a pitch p1. Referring to Figures 3 and 4, the central portion 21 of the reinforcing tube 20 has a substantially constant thickness e and is deformed so that it comprises a first relief 28 and a second relief 30. The reliefs 28, 30 can be bumps or dents. They are for example obtained by knurling the inner face 22 or the outer face 24 of the central portion of the reinforcing tube. The first 28 and the second 30 reliefs form on the inner face of the central portion of the reinforcing tube of the attachment elements for the elastomeric liner 26. These attachment elements prevent tearing thereof.
En particulier selon la présente invention, le premier relief 28 présente la forme d’une bande hélicoïdale ayant un pas à droite par rapport à l’axe longitudinal A-A du tube d’armature. Le deuxième relief 30 présente la forme d’une bande hélicoïdale ayant un pas à gauche par rapport à l’axe longitudinal A-A du tube d’armature. En raison de cette forme hélicoïdale et du fait que les pas des bandes hélicoïdales sont inversés, le premier 28 et le deuxième 30 reliefs empêchent l’arrachage du chemisage en élastomère quel que soit la direction des efforts appliqués sur celui-ci. Ainsi, la solidarisation entre la face interne 22 du tube d’armature et la face externe 40 du chemisage en élastomère résiste mieux aux efforts axiaux et orthoradiaux générés lors de la rotation du rotor hélicoïdal 18.  In particular according to the present invention, the first relief 28 has the shape of a helical band having a pitch to the right with respect to the longitudinal axis A-A of the reinforcing tube. The second relief 30 has the shape of a helical band having a pitch to the left with respect to the longitudinal axis A-A of the reinforcing tube. Due to this helical shape and the fact that the pitch of the helical strips are reversed, the first 28 and second 30 reliefs prevent tearing of the elastomer liner irrespective of the direction of the forces applied thereto. Thus, the connection between the inner face 22 of the reinforcing tube and the outer face 40 of the elastomer liner is more resistant to the axial and orthoradial forces generated during the rotation of the helical rotor 18.
Selon le mode de réalisation préféré de l’invention illustré sur les figures 3 et 4, les reliefs 28, 30 sont constitués par enfoncements de la face externe 24 du tube d’armature. Ces enfoncements sont appelés sillons hélicoïdaux 34 ci-après. Ces sillons hélicoïdaux 34 sont dans cet exemple réalisés par moletage de la face externe 24 du tube d’armature. Ces sillons hélicoïdaux 34 forment des indentations hélicoïdales 36 sur la face interne 22 du tube d’armature.  According to the preferred embodiment of the invention illustrated in Figures 3 and 4, the reliefs 28, 30 are constituted by depressions of the outer face 24 of the reinforcing tube. These depressions are called helical furrows 34 below. These spiral grooves 34 are in this example made by knurling the outer face 24 of the reinforcing tube. These helical grooves 34 form helical indentations 36 on the inner face 22 of the reinforcing tube.
Le premier 28 et le deuxième 30 reliefs se joignent en plusieurs tronçons 32. Des zones intermédiaires 38 situées entre le premier relief 28 et le deuxième relief 30 présentent une concavité opposée à la concavité des premier 28 et deuxième 30 reliefs. Ainsi, sur le mode de réalisation illustré sur les figures 3 et 4, les zones 38 forment des saillies sur la face externe 24 du tube d’armature. Selon ce mode de réalisation, ces zones intermédiaires 38 ont la forme d’un polygone d’ordre 4. Avantageusement, le pas p2 de l’hélicoïde du premier relief 28 est identique au pas p1 de l’hélicoïde de la face interne 42 du chemisage en élastomère. The first 28 and the second 30 reliefs are joined in several sections 32. Intermediate zones 38 situated between the first relief 28 and the second relief 30 have a concavity opposite to the concavity of the first 28 and second 30 reliefs. Thus, in the embodiment illustrated in FIGS. 3 and 4, the zones 38 form projections on the external face 24 of the reinforcing tube. According to this embodiment, these intermediate zones 38 have the shape of a polygon of order 4. Advantageously, the pitch p2 of the helicoid of the first relief 28 is identical to the pitch p1 of the helicoid of the inner face 42 of the elastomer liner.
Le deuxième et le troisième éléments de stator selon le premier mode de réalisation sont identiques au premier élément de stator et ne seront pas décrit en détail.  The second and the third stator elements according to the first embodiment are identical to the first stator element and will not be described in detail.
En variante, les reliefs sont constitués par des saillies qui s’étendent vers l’extérieur du tube d’ancrage et qui forment des creux du côté de la face interne du tube d’armature 20.  As a variant, the reliefs consist of protrusions which extend towards the outside of the anchoring tube and which form recesses on the side of the inner face of the reinforcing tube 20.
En variante, le tube d’armature 20 est déformé de manière à ce qu’il comprenne un nombre de reliefs supérieur à deux.  Alternatively, the reinforcing tube 20 is deformed so that it comprises a number of reliefs greater than two.
En variante, le pas de l’hélicoïde du premier relief 28 et le pas de l’hélicoïde du deuxième relief 30 est sensiblement égal ou supérieur à la longueur du tube d’armature 20 de sorte que le premier relief 28 et le deuxième relief 30 se joignent en un unique tronçon 32.  In a variant, the pitch of the helicoid of the first relief 28 and the pitch of the helicoid of the second relief 30 is substantially equal to or greater than the length of the reinforcing tube 20 so that the first relief 28 and the second relief 30 join in a single section 32.
En variante, les zones 38 positionnées entre la première bande et la deuxième bande présentent la forme d’un polygone d’ordre 3.  As a variant, the zones 38 positioned between the first band and the second band have the shape of a polygon of order 3.
Les figures 5 à 7 représentent des éléments de stator selon un second mode de réalisation de l’invention. En particulier la figure 5 représente un premier 4 et un deuxième 6 élément de stator partiellement assemblés au tronçon tubulaire 10.  Figures 5 to 7 show stator elements according to a second embodiment of the invention. In particular, FIG. 5 represents a first 4 and a second 6 stator element partially assembled to the tubular section 10.
Les premier, deuxième et troisième éléments de stator selon le deuxième mode de réalisation de la présente invention sont similaires aux premier, deuxième et troisième éléments de stator selon le premier mode de réalisation à l’exception de l’existence de deux bagues de retenue 44 fixées dans chaque éléments de stator.  The first, second and third stator elements according to the second embodiment of the present invention are similar to the first, second and third stator elements according to the first embodiment with the exception of the existence of two retaining rings. fixed in each stator element.
Les pièces des éléments de stator selon le deuxième mode de réalisation identiques aux pièces des éléments de stator selon le premier mode de réalisation comportent les mêmes références et ne seront pas décrites une seconde fois.  The parts of the stator elements according to the second embodiment identical to the parts of the stator elements according to the first embodiment have the same references and will not be described a second time.
En référence aux figures 5 et 6, les bagues de retenue 44 du premier 4 et du deuxième 6 éléments de stator sont propres à retarder l’infiltration du fluide pompé entre le tube d’armature 20 et le chemisage en élastomère 26. Elle retiennent les extrémités longitudinales du chemisage en élastomère 26 contre la face interne 22 du tube d’armature. With reference to FIGS. 5 and 6, the retaining rings 44 of the first 4 and the second 6 stator elements are able to delay the infiltration of the fluid pumped between the reinforcing tube 20 and the elastomer liner 26. It retain the longitudinal ends of the elastomeric liner 26 against the inner face 22 of the reinforcing tube.
Les bagues de retenue 44 sont fixées dans chaque portion cylindrique 23 du tube d’armature 20 coaxialement à l’axe longitudinal A-A. En pratique, le chemisage en élastomère 26 est mis en forme par injection d’un mélange élastomère cru dans le tube d’armature 20 lorsque celui-ci est muni de deux bagues de retenue 44.  The retaining rings 44 are fixed in each cylindrical portion 23 of the reinforcing tube 20 coaxially with the longitudinal axis A-A. In practice, the elastomer liner 26 is shaped by injecting a green elastomer mixture into the reinforcing tube 20 when it is provided with two retaining rings 44.
Les bagues de retenue 44 présentent une section en forme de U propre à enceindre une partie de l’extrémité longitudinale du chemisage en élastomère 26. La section radiale en forme d’U des bagues de retenue comporte une branche axiale externe 46, une branche radiale centrale 48 et une branche axiale interne 50.  The retaining rings 44 have a U-shaped section adapted to encase a portion of the longitudinal end of the elastomeric liner 26. The radial U-shaped section of the retaining rings has an outer axial branch 46, a radial branch central 48 and an inner axial branch 50.
La branche axiale externe 46 est fixée sur la face interne 22 de la portion cylindrique 23 du tube d’armature. La branche radiale centrale 48 forme une butée axiale pour le tronçon tubulaire 10 lors de l’assemblage du premier 4 et du deuxième 6 éléments de stator.  The outer axial branch 46 is fixed on the inner face 22 of the cylindrical portion 23 of the reinforcing tube. The central radial branch 48 forms an axial abutment for the tubular section 10 during assembly of the first 4 and the second 6 stator elements.
Une face intérieure 52 de la branche axiale interne 50 comporte des protubérances 54 en forme de dent de scies propre à retenir l’élastomère du chemisage 26.  An inner face 52 of the inner axial branch 50 has protrusions 54 in the form of a saw tooth adapted to retain the elastomer of the liner 26.
Les bagues de retenue 44 forment des butées empêchant le déplacement axial du chemisage en élastomère 26 et retardent ainsi son arrachement.  The retaining rings 44 form stops preventing axial displacement of the elastomeric liner 26 and thus delay its tearing.
Lorsque le premier élément de stator 4, le tronçon tubulaire 10 et le deuxième élément de stator 6 sont assemblés et fixés ensemble par application d’un matériau de soudage au niveau des chanfreins 56, le tronçon tubulaire 10 forme à son tour une butée empêchant le déplacement axial de la bague de retenue 44 du premier élément de stator et de la bague de retenue 44 du deuxième élément de stator.  When the first stator element 4, the tubular section 10 and the second stator element 6 are assembled and fixed together by applying a welding material at the chamfers 56, the tubular section 10 in turn forms a stop preventing the axial displacement of the retaining ring 44 of the first stator element and the retaining ring 44 of the second stator element.
En référence à la figure 7, le troisième élément de stator 8 est fixé à l’embout tubulaire 16 par une soudure 57. L’embout tubulaire 16 présente une portion filetée 13 et une portion 58 opposée emmanchée dans la portion cylindrique 23 du deuxième élément de stator 6. Comme visible sur cette figure, la bague de retenue 44 est en appui contre l’embout tubulaire 16. Lorsque l’embout tubulaire 16 est soudé au troisième élément de stator, l’embout tubulaire 16 forme une butée empêchant le déplacement axial de la bague de retenue 44. With reference to FIG. 7, the third stator element 8 is fixed to the tubular endpiece 16 by a weld 57. The tubular endpiece 16 has a threaded portion 13 and an opposed portion 58 fitted into the cylindrical portion 23 of the second element 6. As shown in this figure, the retaining ring 44 is in abutment against the tubular endpiece 16. When the tubular endpiece 16 is welded to the third stator element, the endpiece tubular 16 forms a stop preventing the axial displacement of the retaining ring 44.

Claims

REVENDICATIONS
1.- Elément de stator (4, 6, 8) d’une pompe à cavités progressives, ledit élément de stator (4, 6 8) comportant : 1.- Stator element (4, 6, 8) of a progressive cavity pump, said stator element (4, 6 8) comprising:
• un tube d’armature (20) ayant un axe longitudinal (A-A), une face interne (22) et une face externe (24), et  An armature tube (20) having a longitudinal axis (A-A), an inner face (22) and an outer face (24), and
• un chemisage en élastomère (26) fixé sur la face interne du tube d’armature,  An elastomer liner (26) fixed on the inner face of the reinforcing tube,
caractérisé en ce qu’au moins une portion (21 ) du tube d’armature (20) présente une épaisseur (e) sensiblement constante et en ce que ladite portion (21 ) du tube d’armature (20) est déformée de manière à ce qu’elle comprenne au moins un premier relief (28) et un deuxième relief (30), le premier relief (28) présentant la forme d’une bande hélicoïdale ayant un pas à droite par rapport à l’axe longitudinal (A-A) du tube d’armature, le deuxième relief (30) présentant la forme d’une bande hélicoïdale ayant un pas à gauche par rapport à l’axe longitudinal (A-A) du tube d’armature, le premier relief (28) et le deuxième relief (30) se joignant en au moins un tronçon (32).  characterized in that at least a portion (21) of the reinforcing tube (20) has a substantially constant thickness (e) and in that said portion (21) of the reinforcing tube (20) is deformed so as to it comprises at least a first relief (28) and a second relief (30), the first relief (28) having the shape of a helical band having a right-hand pitch with respect to the longitudinal axis (AA) of the reinforcing tube, the second relief (30) having the shape of a helical strip having a pitch to the left with respect to the longitudinal axis (AA) of the reinforcing tube, the first relief (28) and the second relief (30) joining in at least one section (32).
2.- Elément de stator (4, 6, 8) selon la revendication 1 , dans lequel le premier relief (28) et le deuxième relief (30) se joignent en plusieurs tronçons (32), et dans lequel les zones intermédiaires (38) situées entre le premier relief (28) et le deuxième relief (30) présentent une forme d’un polygone au moins d’ordre 3. 2. A stator element (4, 6, 8) according to claim 1, wherein the first relief (28) and the second relief (30) join into several sections (32), and in which the intermediate zones (38) ) located between the first relief (28) and the second relief (30) have a shape of a polygon at least of order 3.
3.- Elément de stator (4, 6, 8) selon l’une quelconque des revendications 1 et 2, dans lequel le premier relief (28) et le deuxième relief (30) forment des sillons (34) sur la face externe de la portion (21) du tube d’armature (20). 3.- stator element (4, 6, 8) according to any one of claims 1 and 2, wherein the first relief (28) and the second relief (30) form grooves (34) on the outer face of the portion (21) of the reinforcing tube (20).
4.- Elément de stator (4, 6, 8) selon l’une quelconque des revendications 1 à 3, dans lequel le chemisage en élastomère (26) présente une face externe (40) fixée à la face interne (22) du tube d’armature (20), et une face interne (42) de forme hélicoïdale ayant un pas (p1 ), et dans lequel le pas (p2) de la bande hélicoïdale du premier relief (28) est identique au pas (p1) de la forme hélicoïdale de la face interne (42) du chemisage en élastomère. 4. A stator element (4, 6, 8) according to any one of claims 1 to 3, wherein the elastomeric liner (26) has an outer face (40) fixed to the inner face (22) of the tube reinforcement (20), and an inner face (42) of helical shape having a pitch (p1), and wherein the pitch (p2) of the helical band of the first relief (28) is identical to the pitch (p1) of the helical shape of the inner face (42) of the elastomer liner.
5.- Elément de stator (4, 6, 8) selon l’une quelconque des revendications 1 à 4, dans lequel le tube d’armature (20) comporte à chaque extrémité une portion cylindrique (23) et dans lequel ledit élément de stator (4, 6, 8) comporte au moins une bague de retenue (44) axiale fixée sur la portion cylindrique (23) de l’élément de stator (4, 6, 8), ladite bague de retenue (44) ayant une section radiale de forme générale en U propre à enceindre une partie d’une extrémité longitudinale du chemisage en élastomère (26). 6.- Elément de stator (4, 6, 8) selon la revendication 5, dans lequel au moins une face interne d’une branche axiale de la bague de retenue (44) présente des protubérances (54) en forme de dents de scie. 5.- stator element (4, 6, 8) according to any one of claims 1 to 4, wherein the reinforcing tube (20) has at each end a cylindrical portion (23) and wherein said element stator (4, 6, 8) comprises at least one axial retaining ring (44) fixed to the cylindrical portion (23) of the stator element (4, 6, 8), said retaining ring (44) having a a generally U-shaped radial section for enclosing a portion of a longitudinal end of the elastomeric liner (26). 6. A stator element (4, 6, 8) according to claim 5, wherein at least one inner face of an axial branch of the retaining ring (44) has protrusions (54) in the form of saw teeth. .
7.- Pompe à cavités progressives (2) comportant : 7.- Progressive cavity pump (2) comprising:
- un rotor hélicoïdal (18) monté rotatif dans le chemisage en élastomère a helical rotor (18) rotatably mounted in the elastomer liner
(26), (26)
- au moins un premier (4) et un deuxième (6) éléments de stator conformes à l’une quelconque des revendications 5 et 6,  at least a first (4) and a second (6) stator element according to any one of claims 5 and 6,
- un tronçon tubulaire (10) emmanché, d’un côté, dans ladite portion cylindrique (23) du premier élément de stator (4) et, de l’autre côté, dans ladite portion cylindrique (23) du deuxième élément de stator (6), ledit tronçon tubulaire (10) étant en appui, d’un côté, contre la bague de retenue (44) du premier élément de stator (4) et, de l’autre côté, contre la bague de retenue (44) du deuxième élément de stator (6), ledit tronçon tubulaire (10) formant une butée propre à empêcher le déplacement axial des bagues de retenue (44).  a tubular section (10) fitted on one side with said cylindrical portion (23) of the first stator element (4) and on the other side with said cylindrical portion (23) of the second stator element ( 6), said tubular section (10) bearing, on one side, against the retaining ring (44) of the first stator element (4) and, on the other side, against the retaining ring (44). the second stator element (6), said tubular section (10) forming a stop adapted to prevent the axial displacement of the retaining rings (44).
8.- Pompe à cavités progressives (2) selon la revendication 7, qui comporte en outre un embout tubulaire (14, 16) ayant une portion filetée (13) et une portion opposée (58) emmanchée dans une autre portion cylindrique (23) du deuxième élément de stator (6), ledit embout tubulaire (14, 16) formant une butée empêchant le déplacement axial de la bague de retenue (44). 8.- progressive cavity pump (2) according to claim 7, which further comprises a tubular nozzle (14, 16) having a threaded portion (13) and an opposite portion (58) fitted into another cylindrical portion (23). the second stator element (6), said tubular tip (14, 16) forming a stop preventing the axial displacement of the retaining ring (44).
9.- Pompe à cavités progressives (2) selon l’une quelconque des revendications 7 et 8, dans lequel la portion cylindrique (23) du premier élément de stator (4), la portion cylindrique (23) du deuxième élément de stator (6) et le tronçon tubulaire (10) sont fixés par soudage. 9.- progressive cavity pump (2) according to any one of claims 7 and 8, wherein the cylindrical portion (23) of the first stator element (4), the cylindrical portion (23) of the second stator element ( 6) and the tubular section (10) are fixed by welding.
10.- Pompe à cavités progressives (2) selon l’une quelconque des revendications 8 et 9, dans lequel la portion cylindrique (23) du deuxième élément de stator (8) et l’embout tubulaire (16) sont fixés par soudage (57). 10.- progressive cavity pump (2) according to any one of claims 8 and 9, wherein the cylindrical portion (23) of the second stator element (8) and the tubular nozzle (16) are fixed by welding ( 57).
EP19730401.7A 2018-05-23 2019-05-16 Stator element of a progressive cavity pump and progressive cavity pump Active EP3797223B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1854309A FR3081519B1 (en) 2018-05-23 2018-05-23 STATOR ELEMENT OF A PROGRESSIVE CAVITY PUMP AND PROGRESSIVE CAVITY PUMP
PCT/FR2019/051113 WO2019224457A1 (en) 2018-05-23 2019-05-16 Stator element of a progressive cavity pump and progressive cavity pump

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EP3797223A1 true EP3797223A1 (en) 2021-03-31
EP3797223B1 EP3797223B1 (en) 2022-07-20

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US (1) US11326594B2 (en)
EP (1) EP3797223B1 (en)
CA (1) CA3100403A1 (en)
FR (1) FR3081519B1 (en)
WO (1) WO2019224457A1 (en)

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DE3438379A1 (en) * 1984-10-19 1986-04-24 Kunststofftechnik Rodenberg GmbH & Co KG, 3054 Rodenberg Stator for eccentric spiral pumps
GB2244517B (en) * 1990-05-31 1994-05-04 Mono Pumps Ltd Helical gear pump and stator
DE19804258A1 (en) * 1998-02-04 1999-08-12 Artemis Kautschuk Kunststoff Eccentric screw pump
DE10245497C5 (en) * 2002-09-27 2009-02-19 Wilhelm Kächele GmbH Elastomertechnik Progressive cavity pump with increased temperature range
DE10338632B4 (en) * 2003-08-22 2005-11-03 Wilhelm Kächele GmbH Eccentric screw pump with erosion-resistant rotor
DE102004038477B3 (en) * 2004-08-07 2005-10-06 Netzsch-Mohnopumpen Gmbh Cavity Pump
RU2402693C1 (en) * 2009-03-10 2010-10-27 Открытое акционерное общество "Павловский машзавод" One-screw hydraulic machine
US8523545B2 (en) * 2009-12-21 2013-09-03 Baker Hughes Incorporated Stator to housing lock in a progressing cavity pump
DE102012112044B4 (en) * 2012-05-04 2015-10-08 Netzsch Pumpen & Systeme Gmbh Self-fixing stator housing

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US20210190068A1 (en) 2021-06-24
WO2019224457A1 (en) 2019-11-28
US11326594B2 (en) 2022-05-10
FR3081519B1 (en) 2020-05-29
CA3100403A1 (en) 2019-11-28
FR3081519A1 (en) 2019-11-29
EP3797223B1 (en) 2022-07-20

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