EP1733147B1 - Stator for an eccentric spiral pump or an eccentric worm motor according to the moineau principle - Google Patents

Stator for an eccentric spiral pump or an eccentric worm motor according to the moineau principle Download PDF

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Publication number
EP1733147B1
EP1733147B1 EP04803161.1A EP04803161A EP1733147B1 EP 1733147 B1 EP1733147 B1 EP 1733147B1 EP 04803161 A EP04803161 A EP 04803161A EP 1733147 B1 EP1733147 B1 EP 1733147B1
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EP
European Patent Office
Prior art keywords
stator
stator according
inner tube
eccentric
inner pipe
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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.)
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EP04803161.1A
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German (de)
French (fr)
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EP1733147A2 (en
Inventor
Sebastian Jäger
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Artemis Kautschuk und Kunststoff Technik GmbH
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Artemis Kautschuk und Kunststoff Technik GmbH
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Publication of EP1733147A2 publication Critical patent/EP1733147A2/en
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    • 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

Definitions

  • the invention relates to a stator for a progressing cavity pump or an eccentric screw motor with a stator having an outer tube with a lining made of rubber or a rubber-like material and shaped like a two- or multi-pitch thread for receiving a rigid, also shaped like a coarse thread Rotor having the steep thread of the stator in each case one more gear than the coarse thread of the rotor.
  • the mode of operation of progressing cavity pumps and motors is also referred to as the Moineau principle.
  • a stator of the type mentioned is known in which the liner is adhesively bonded to the outer tube, ie by chemical bonding between the elastomeric lining and a metallic outer tube.
  • the adherent connection between liner and outer tube dissolves, especially when the stator is exposed to high temperatures and / or chemical stress during operation.
  • Rubber types such as HNBR, fluorinated rubbers or silicone rubbers, which remain functional at temperatures of 160 ° C and higher, but even with these rubbers, the rubber-metal compound is problematic, which can be destroyed in continuous use.
  • the object of the present invention is to provide a further stator which remains functional even under conditions under which the firmly adhering bond between the lining and the outer tube, for. B. by chemical influences or high temperatures, would be destroyed.
  • This object is achieved in that in the lining provided with openings inner tube is arranged.
  • the elastomeric material of the liner engages the inner tube by penetrating the apertures.
  • spacer strips are arranged between outer tube and inner tube.
  • the elastomer material of the lining can penetrate not only the openings of the inner tube. It can also, at least in the area between the Spacer strips, enclose the inner tube and has in these areas a flat contact with the outer tube.
  • the inner tube can be connected to the outer tube, z. B. by welding on the front sides or holes that pass through the outer tube.
  • the spacer strips a particularly firm and secure connection between the parts of the stator is achieved without increasing the cost of manufacturing the stator and with respect to the components used significantly.
  • the stator is usually manufactured so that the elastomeric material which is to form the lining is introduced by spraying into the outer tube, wherein the inner tube is already arranged in the outer tube.
  • the spacer bars prevent the inner tube from being pushed towards the outer tube by the injection pressure. They thus cause sufficient space remains between outer tube and inner tube, which fills the elastomeric material, which passes through the openings in the interior, creating undercuts that provide a very good positive connection with the inner tube.
  • the spacer bars may, according to a possible embodiment of the invention, be straight, flat profiles which extend in the direction of the longitudinal axis of the stator and practically over most of its length, several such spacer bars being distributed over the circumference of the inner tube.
  • the spacer strips be annular and enclose the circumference of the inner tube, wherein a plurality of such rings can be arranged distributed in the longitudinal direction spaced from each other on a stator.
  • the spacer bar may be helical. This embodiment has the advantage that a single such spacer strip can already be sufficient for one.
  • a similar intimate clawing between the Elstomermaterial the liner and the inner tube can also be achieved by a further embodiment of the invention by the perforations having inner tube is designed wave-shaped, it does not matter whether the waveform is selected in the axial or radial direction of the inner tube.
  • the choice of a particular shape of the spacer bar / s in cross section is not limited. It can z. B. round, square and / or rectangular spacer strips are used.
  • the in Fig. 1 Stator shown has an outer tube 1 made of a solid material, for. As steel, in the interior of a lining 2 made of rubber or a rubber-like material is arranged.
  • the lining 2 has a cavity 3, which is only roughly shown in the drawing.
  • the cavity 3 forms the space for receiving the rotor (not shown) and the conveyed material (pump cavity), if the stator is used in an eccentric screw pump, or the space for receiving the flowing drive means, if the stator part of a used as a motor device is.
  • the cavity 3 extends over the entire length of the stator. He is two or more helical spiral wound and serves to receive a rotor, not shown here.
  • the forces occurring during use of the pump are absorbed by the lining 2 and forwarded to the outer tube 1, via which the bearing of the pump takes place. For a firm connection between outer tube 1 and lining 2 must therefore be taken care of.
  • an inner tube 4 is arranged, which has a perforation or a plurality of openings 5 and which is fixedly connected to the outer tube 1.
  • the openings 5 are filled by the material of the lining 2. This results in a positive connection between the outer tube 1 and lining 2, which secures the lining 2 against displacement in the longitudinal direction as well as against rotation about its axis.
  • a connection made by vulcanization or gluing between outer tube and lining can be omitted.
  • the stator according to the FIGS. 2 and 3 has the same components as the stator according to Fig. 1 However, here are still between the outer tube 1 and the inner tube 4 spacers. 6 are arranged.
  • Fig. 2 shows the cross section of in Fig. 3 in perspective shown stator. In the FIGS. 2 and 3 chosen number of four spacer strips 6 is exemplary.
  • the inner tube 4 may either consist of a perforations exhibiting tube or be formed of a commercially available perforated plate, which is bent cylindrically. To produce a stator according to the invention, the inner tube 4 and the spacer strips 6 are pushed into the outer tube 1. Subsequently, the rubber material of the lining 2 can be introduced by spraying.
  • connection can be made by end-side welding 8, which connects the ends of the inner tube 1 and the spacer bar 6 with each other and with the inside of the outer tube 1 ( Fig. 6 ). If the embodiment according to Fig. 5 chosen and the annular spacer bar 6 "flush placed at the end of the inner tube 4 (not shown), even a radially closed welding of the inner tube 4 and the spacer bar 6" is possible.
  • connection can be made by punctiform welds 9, which are mounted at different, distributed over the circumference and the longitudinal extent of the stator locations in holes that pass through the outer tube 1 and the spacer bar 6 ( Fig. 7 ).
  • the outer tube 1 and the inner tube 4 may be connected to each other by a press fit.
  • connection techniques mentioned here can also be used when only an inner tube is used, that is without the spacer strips 6, 6 'or 6'', as in Fig. 1 shown.
  • the inner tube 4 elevations 7, which extend to the outside, ie in the direction of the outer tube 1. These elevations then provide the desired spacing to the outer tube 1, so that the spacer strip / spacer strips 6 can be omitted.
  • the elastomeric material of the lining 2 can then also enclose the inner tube.
  • the waveform of the inner tube 4 continues in the circumferential direction while Fig. 9 a stator, in which the inner tube 4 is deformed wave-shaped in the axial direction. Again, an enclosure of the inner tube by the elastomer mass takes place. The waveform could also continue approximately helically around the longitudinal axis of the stator (not shown here).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Die Erfindung betrifft einen Stator für eine Exzenterschneckenpumpe oder einen Exzenterschneckenmotor mit einem Stator, der ein Außenrohr mit einer Auskleidung aus Gummi oder einem gummiähnlichen Werkstoff und einen nach Art eines zwei- oder mehrgängigen Steilgewindes geformten Hohlraum zur Aufnahme eines starren, ebenfalls nach Art eines Steilgewindes geformten Rotors aufweist, wobei das Steilgewinde des Stators jeweils einen Gang mehr aufweist als das Steilgewinde des Rotors.The invention relates to a stator for a progressing cavity pump or an eccentric screw motor with a stator having an outer tube with a lining made of rubber or a rubber-like material and shaped like a two- or multi-pitch thread for receiving a rigid, also shaped like a coarse thread Rotor having the steep thread of the stator in each case one more gear than the coarse thread of the rotor.

Die Wirkungsweise von Exzenterschneckenpumpen und -motoren wird auch als Moineau-Prinzip bezeichnet. Aus der DE 44 03 598 A1 ist eine Stator der eingangs genannten Art bekannt, bei dem die Auskleidung festhaftend mit dem Außenrohr verbunden ist, d.h. durch chemische Bindung zwischen der elastomerischen Auskleidung und einem metallischen Außenrohr. Bei einem derartigen Stator besteht die Gefahr, dass sich die festhaftende Verbindung zwischen Auskleidung und Außenrohr löst, vor allem dann, wenn der Stator während des Betriebes hohen Temperaturen und/oder chemischen Belastungen ausgesetzt ist.The mode of operation of progressing cavity pumps and motors is also referred to as the Moineau principle. From the DE 44 03 598 A1 a stator of the type mentioned is known in which the liner is adhesively bonded to the outer tube, ie by chemical bonding between the elastomeric lining and a metallic outer tube. In such a stator, there is a risk that the adherent connection between liner and outer tube dissolves, especially when the stator is exposed to high temperatures and / or chemical stress during operation.

Es gibt Kautschuk-Typen, wie HNBR, Fluor-Kautschuke oder Silikon-Kautschuke, die bei Temperaturen von 160° C und höher funktionsfähig bleiben, jedoch ist auch bei diesen Kautschuken die Gummi-Metallverbindung problematisch, die im Dauereinsatz zerstört werden kann.There are rubber types, such as HNBR, fluorinated rubbers or silicone rubbers, which remain functional at temperatures of 160 ° C and higher, but even with these rubbers, the rubber-metal compound is problematic, which can be destroyed in continuous use.

In der EE 198 42 754 A1 und der DE 2 250 263 A1 sind Statoren von Exzenterschneckenpumpen beschrieben, deren Mantel gelocht ist. Bei der Herstellung der Statoren durchdringt die elastomere Auskleidung diese Löcher, wodurch eine formschlüssige Verbindung zwischen Auskleidung und Statormantel hergestellt wird.In the EE 198 42 754 A1 and the DE 2 250 263 A1 Stators are described by progressing cavity pumps, the jacket is perforated. During the manufacture of the stators, the elastomeric lining penetrates these holes, thereby producing a positive connection between the lining and the stator jacket.

Aufgabe der vorliegenden Erfindung ist es, einen weiteren Stator zur Verfügung zu stellen, der auch unter Bedingungen funktionsfähig bleibt, unter denen die fest haftende Bindung zwischen der Auskleidung und dem Außenrohr, z. B. durch chemische Einflüsse oder hohe Temperaturen, zerstört werden würde.The object of the present invention is to provide a further stator which remains functional even under conditions under which the firmly adhering bond between the lining and the outer tube, for. B. by chemical influences or high temperatures, would be destroyed.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass in der Auskleidung ein mit Durchbrechungen versehenes Innenrohr angeordnet ist.This object is achieved in that in the lining provided with openings inner tube is arranged.

Das Elastomermaterial der Auskleidung verkrallt sich mit dem Innenrohr, indem es die Durchbrechungen durchdringt. Somit kommt eine formschlüssige Verbindung zwischen den einzelnen Teilen des Stators zustande, die weit besser geeignet ist, den beschriebenen Belastungen standzuhalten, als eine chemische Gummi-Metall-Verbindung, etwa mittels eines Haftvermittlers.The elastomeric material of the liner engages the inner tube by penetrating the apertures. Thus, a positive connection between the individual parts of the stator is achieved, which is far better suited to withstand the described loads, as a chemical rubber-metal compound, such as by means of a bonding agent.

Nach einer vorteilhaften Ausführung der Erfindung sind zwischen Außenrohr und Innenrohr Abstandsleisten angeordnet. Hierbei kann das Elastomermaterial der Auskleidung nicht nur die Durchbrechungen des Innenrohrs durchdringen. Es kann auch, zumindest im Bereich zwischen den Abstandsleisten, das Innenrohr umschließen und hat in diesen Bereichen einen flächigen Kontakt zum Außenrohr.According to an advantageous embodiment of the invention, spacer strips are arranged between outer tube and inner tube. In this case, the elastomer material of the lining can penetrate not only the openings of the inner tube. It can also, at least in the area between the Spacer strips, enclose the inner tube and has in these areas a flat contact with the outer tube.

Das Innenrohr kann mit dem Außenrohr verbunden werden, z. B. durch Verschweißungen an den Stirnseiten oder an Bohrungen, die das Außenrohr durchsetzen.The inner tube can be connected to the outer tube, z. B. by welding on the front sides or holes that pass through the outer tube.

Durch die Abstandsleisten wird eine besonders feste und sichere Verbindung zwischen den Teilen des Stators erreicht, ohne den Aufwand bei der Fertigung des Stators und bezüglich der verwendeten Komponenten nennenswert zu erhöhen. Der Stator wird üblicherweise so hergestellt, dass das Elastomermaterial, das die Auskleidung bilden soll, durch Spritzen in das Außenrohr eingebracht wird, wobei das Innenrohr bereits im Außenrohr angeordnet ist. Die Abstandsleisten verhindern dabei, dass das Innenrohr durch den Spritzdruck zum Außenrohr hin gedrängt wird. Sie bewirken somit, dass zwischen Außenrohr und Innenrohr ausreichend Raum verbleibt, den das Elastomermaterial ausfüllt, das durch die Durchbrechungen im Innenraum hindurch tritt, wodurch Hinterschneidungen entstehen, die für eine sehr gute formschlüssige Verbindung mit dem Innenrohr sorgen.The spacer strips a particularly firm and secure connection between the parts of the stator is achieved without increasing the cost of manufacturing the stator and with respect to the components used significantly. The stator is usually manufactured so that the elastomeric material which is to form the lining is introduced by spraying into the outer tube, wherein the inner tube is already arranged in the outer tube. The spacer bars prevent the inner tube from being pushed towards the outer tube by the injection pressure. They thus cause sufficient space remains between outer tube and inner tube, which fills the elastomeric material, which passes through the openings in the interior, creating undercuts that provide a very good positive connection with the inner tube.

Die Abstandsleisten können nach einer möglichen Ausführungsform der Erfindung gerade, flache Profile sein, die sich in Richtung der Längsachse des Stators und praktisch über den größten Teil seiner Länge erstrecken, wobei mehrere derartige Abstandsleisten über den Umfang des Innenrohres verteilt angeordnet sind.The spacer bars may, according to a possible embodiment of the invention, be straight, flat profiles which extend in the direction of the longitudinal axis of the stator and practically over most of its length, several such spacer bars being distributed over the circumference of the inner tube.

Nach einer anderen Ausführungsmöglichkeit der Erfindung können die Abstandsleisten ringförmig sein und den Umfang des Innenrohres umschließen, wobei an einem Stator mehrere derartige Ringe in Längsrichtung voneinander beabstandet verteilt angeordnet sein können.According to another embodiment of the invention can the spacer strips be annular and enclose the circumference of the inner tube, wherein a plurality of such rings can be arranged distributed in the longitudinal direction spaced from each other on a stator.

Nach einer weiteren Ausführungsform der Erfindung kann die Abstandsleiste wendelförmig sein. Diese Ausführungsform hat den Vorteil, dass für einen bereits eine einzige derartige Abstandsleiste ausreichend sein kann.According to a further embodiment of the invention, the spacer bar may be helical. This embodiment has the advantage that a single such spacer strip can already be sufficient for one.

Eine ähnlich innige Verkrallung zwischen dem Elstomermaterial der Auskleidung und dem Innenrohr lässt sich auch durch eine weitere Ausführungsform der Erfindung erzielen, indem das Durchbrechungen aufweisende Innenrohr wellenförmig ausgestaltet ist, wobei es gleichgültig ist, ob die Wellenform in axialer oder radialer Richtung des Innenrohres gewählt wird.A similar intimate clawing between the Elstomermaterial the liner and the inner tube can also be achieved by a further embodiment of the invention by the perforations having inner tube is designed wave-shaped, it does not matter whether the waveform is selected in the axial or radial direction of the inner tube.

Die Wahl einer bestimmten Form der Abstandsleiste/n im Querschnitt ist nicht begrenzt. Es können z. B. runde, quadratische und/oder rechteckige Abstandsleisten zum Einsatz kommen.The choice of a particular shape of the spacer bar / s in cross section is not limited. It can z. B. round, square and / or rectangular spacer strips are used.

Weitere Ausführungsformen der Erfindung sind. in den Unteransprüchen enthalten.Further embodiments of the invention are. included in the subclaims.

Weitere Einzelheiten der Erfindung werden anhand der Zeichnung erläutert, in der Ausführungsbeispiele der Erfindung dargestellt sind.Further details of the invention will be explained with reference to the drawing, are shown in the embodiments of the invention.

Es zeigen:

Fig. 1
einen Querschnitt durch einen erfindungsgemäßen Stator,
Fig. 2
eine andere Ausführungsform des erfindungsgemäßen Stators im Querschnitt,
Fig. 3
einen Abschnitt der Außen- und Innenrohre eines Stators gemäß Fig. 2 in perspektivischer Darstellung mit teilweise freigelegten Schichten,
Fig. 4
die perspektivische Darstellung einer weiteren Ausführungsform mit teilweise freigelegten Schichten,
Fig. 5
die perspektivische Darstellung einer weiteren erfindungsgemäßen Ausführungsform mit teilweise freigelegten Schichten,
Fig. 6
einen Längsschnitt durch das Endstück eines Stators gemäß Fig. 2,
Fig. 7
einen Längsschnitt durch das Endstück eines Stators gemäß Fig. 2 in gegenüber Fig. 6 abgewandelter Ausführung,
Fig. 8
eine weitere Ausführungsform eines erfindungsgemäßen Stators im Querschnitt,
Fig. 9
eine weitere Ausführungsform eines erfindungsgemäßen Stators im Längsschnitt und
Fig. 10
eine weitere Ausführungsform eines Stators.
Show it:
Fig. 1
a cross section through a stator according to the invention,
Fig. 2
another embodiment of the stator according to the invention in cross section,
Fig. 3
a portion of the outer and inner tubes of a stator according to Fig. 2 in perspective with partially exposed layers,
Fig. 4
the perspective view of another embodiment with partially exposed layers,
Fig. 5
the perspective view of another embodiment of the invention with partially exposed layers,
Fig. 6
a longitudinal section through the end of a stator according to Fig. 2 .
Fig. 7
a longitudinal section through the end of a stator according to Fig. 2 in opposite Fig. 6 modified version,
Fig. 8
a further embodiment of a stator according to the invention in cross-section,
Fig. 9
a further embodiment of a stator according to the invention in longitudinal section and
Fig. 10
another embodiment of a stator.

Der in Fig. 1 dargestellte Stator weist ein Außenrohr 1 aus einem festen Werkstoff, z. B. Stahl, auf, in dessen Innerem eine Auskleidung 2 aus Gummi oder einem gummiähnlichen Werkstoff angeordnet ist. Die Auskleidung 2 weist einen Hohlraum 3 auf, der in der Zeichnung lediglich grob dargestellt ist. Der Hohlraum 3 bildet den Raum zur Aufnahme des Rotors (nicht dargestellt) und des Fördergutes (Pumpenhohlraum), falls der Stator bei einer Exzenterschneckenpumpe zum Einsatz kommt, bzw. den Raum zur Aufnahme des strömenden Antriebsmittels, falls der Stator Teil einer als Motor genutzten Vorrichtung ist. Der Hohlraum 3 erstreckt sich über die gesamte Länge des Stators. Er ist zwei- oder mehrgängig schneckenförmig gewunden und dient zur Aufnahme eines hier nicht dargestellten Rotors. Die beim Einsatz der Pumpe auftretenden Kräfte werden von der Auskleidung 2 aufgenommen und an das Außenrohr 1 weitergeleitet, über das die Lagerung der Pumpe erfolgt. Für eine feste Verbindung zwischen Außenrohr 1 und Auskleidung 2 muss daher gesorgt sein.The in Fig. 1 Stator shown has an outer tube 1 made of a solid material, for. As steel, in the interior of a lining 2 made of rubber or a rubber-like material is arranged. The lining 2 has a cavity 3, which is only roughly shown in the drawing. The cavity 3 forms the space for receiving the rotor (not shown) and the conveyed material (pump cavity), if the stator is used in an eccentric screw pump, or the space for receiving the flowing drive means, if the stator part of a used as a motor device is. The cavity 3 extends over the entire length of the stator. He is two or more helical spiral wound and serves to receive a rotor, not shown here. The forces occurring during use of the pump are absorbed by the lining 2 and forwarded to the outer tube 1, via which the bearing of the pump takes place. For a firm connection between outer tube 1 and lining 2 must therefore be taken care of.

Wichtig ist nun, dass in dem Außenrohr 1 ein Innenrohr 4 angeordnet ist, das eine Perforierung bzw. eine Vielzahl von Durchbrechungen 5 aufweist und das mit dem Außenrohr 1 fest verbunden ist. Die Durchbrechungen 5 werden von dem Material der Auskleidung 2 ausgefüllt. Dadurch kommt es zu einer formschlüssigen Verbindung zwischen Außenrohr 1 und Auskleidung 2, die die Auskleidung 2 sowohl gegen Verschiebung in Längsrichtung als auch gegen Verdrehen um ihre Achse sichert. Eine durch Vulkanisation oder Kleben hergestellte Verbindung zwischen Außenrohr und Auskleidung kann entfallen.It is now important that in the outer tube 1, an inner tube 4 is arranged, which has a perforation or a plurality of openings 5 and which is fixedly connected to the outer tube 1. The openings 5 are filled by the material of the lining 2. This results in a positive connection between the outer tube 1 and lining 2, which secures the lining 2 against displacement in the longitudinal direction as well as against rotation about its axis. A connection made by vulcanization or gluing between outer tube and lining can be omitted.

Der Stator gemäß den Fig. 2 und 3 weist die gleichen Bauteile auf wie der Stator gemäß Fig. 1, wobei sich hier jedoch noch zwischen dem Außenrohr 1 und dem Innenrohr 4 Abstandshalter 6 angeordnet sind. Fig. 2 zeigt den Querschnitt des in Fig. 3 perspektivisch dargestellten Stators. Die in Fig. 2 und 3 gewählte Anzahl von vier Abstandsleisten 6 ist beispielhaft.The stator according to the FIGS. 2 and 3 has the same components as the stator according to Fig. 1 However, here are still between the outer tube 1 and the inner tube 4 spacers. 6 are arranged. Fig. 2 shows the cross section of in Fig. 3 in perspective shown stator. In the FIGS. 2 and 3 chosen number of four spacer strips 6 is exemplary.

Das Innenrohr 4 kann entweder aus einem Durchbrechungen aufweisendem Rohr bestehen oder aus einem handelsüblichen Lochblech gebildet werden, das zylindrisch gebogen wird. Zur Herstellung eines erfindungsgemäßen Stators werden das Innenrohr 4 und die Abstandsleisten 6 in das Außenrohr 1 geschoben. Anschließend kann durch Spritzen das Gummimaterial der Auskleidung 2 eingebracht werden.The inner tube 4 may either consist of a perforations exhibiting tube or be formed of a commercially available perforated plate, which is bent cylindrically. To produce a stator according to the invention, the inner tube 4 and the spacer strips 6 are pushed into the outer tube 1. Subsequently, the rubber material of the lining 2 can be introduced by spraying.

In den Fig. 4 und 5 sind zwei Möglichkeiten dargestellt, wie die Abstandsleisten 6', 6" zwischen dem Außenrohr 1 und dem Innenrohr 4 angeordnet sein können. Während in Fig. 4 eine Abstandsleiste 6' das Innenrohr 4 wendelförmig umgibt, befindet sich in Fig. 5 ein aus der Abstandsleiste 6" gebildeter Ring um das Innenrohr 4. Es versteht sich von selbst, dass mehrere Ringe 6" um das Innenrohr 4 verteilt angeordnet sein können (hier nicht dargestellt). Auch ist es nicht zwingend, nur eine wendelförmig das Innenrohr 4 umschließende Abstandsleiste 6' zu verwenden. Es können erfindungsgemäß auch zwei oder mehrere Abstandsleisten angebracht werden.In the 4 and 5 Two possibilities are shown how the spacer strips 6 ', 6 "can be arranged between the outer tube 1 and the inner tube 4. While in Fig. 4 a spacer bar 6 'surrounding the inner tube 4 helically, is located in Fig. 5 a ring formed around the inner tube 4 from the spacer bar 6 ". It goes without saying that a plurality of rings 6" can be arranged distributed around the inner tube 4 (not shown here). Also, it is not mandatory to use only a helically the inner tube 4 enclosing spacer bar 6 '. It can be mounted according to the invention, two or more spacer bars.

In den Fig. 6 und 7 sind zwei Möglichkeiten dargestellt, das Außenrohr 1 mit dem Innenrohr 4 zu verbinden. Die Verbindung kann durch stirnseitige Verschweißung 8 erfolgen, die die Enden des Innenrohrs 1 und der Abstandsleiste 6 mit einander und mit der Innenseite des Außenrohres 1 verbindet (Fig. 6). Wird die Ausführungsform gemäß Fig. 5 gewählt und die ringförmige Abstandsleiste 6" bündig abschließend am Ende des Innenrohres 4 platziert (nicht dargestellt), ist sogar eine radial geschlossene Verschweißung des Innenrohres 4 und der Abstandsleiste 6" möglich.In the 6 and 7 show two ways to connect the outer tube 1 with the inner tube 4. The connection can be made by end-side welding 8, which connects the ends of the inner tube 1 and the spacer bar 6 with each other and with the inside of the outer tube 1 ( Fig. 6 ). If the embodiment according to Fig. 5 chosen and the annular spacer bar 6 "flush placed at the end of the inner tube 4 (not shown), even a radially closed welding of the inner tube 4 and the spacer bar 6" is possible.

Alternativ oder zusätzlich kann die Verbindung durch punktförmige Verschweißungen 9 erfolgen, die an verschiedenen, über den Umfang und die Längenerstreckung des Stators verteilten Stellen in Bohrungen angebracht sind, die das Außenrohr 1 und die Abstandsleiste 6 durchsetzen (Fig. 7).Alternatively or additionally, the connection can be made by punctiform welds 9, which are mounted at different, distributed over the circumference and the longitudinal extent of the stator locations in holes that pass through the outer tube 1 and the spacer bar 6 ( Fig. 7 ).

Nach einer weiteren, hier nicht gesondert dargestellten Ausführungsform der Erfindung können das Außenrohr 1 und das Innenrohr 4 durch eine Presspassung miteinander verbunden sein. Selbstverständlich können die hier erwähnten Verbindungstechniken auch dann zum Einsatz kommen, wenn lediglich ein Innenrohr verwendet wird, also ohne die Abstandsleisten 6, 6' oder 6'', wie in Fig. 1 dargestellt.According to a further, not separately illustrated embodiment of the invention, the outer tube 1 and the inner tube 4 may be connected to each other by a press fit. Of course, the connection techniques mentioned here can also be used when only an inner tube is used, that is without the spacer strips 6, 6 'or 6'', as in Fig. 1 shown.

Nach einer weiteren, hier in Fig. 10 dargestellten Ausführungsform der Erfindung weist das Innenrohr 4 Erhebungen 7 auf, die sich nach außen, also in Richtung des Außenrohres 1 erstrecken. Diese Erhebungen sorgen dann für die gewünschte Beabstandung zum Außenrohr 1, so dass die Abstandsleiste/Abstandsleisten 6 entfallen können. Das Elastomermaterial der Auskleidung 2 kann dann ebenfalls das Innenrohr umschließen.After another, here in Fig. 10 illustrated embodiment of the invention, the inner tube 4 elevations 7, which extend to the outside, ie in the direction of the outer tube 1. These elevations then provide the desired spacing to the outer tube 1, so that the spacer strip / spacer strips 6 can be omitted. The elastomeric material of the lining 2 can then also enclose the inner tube.

Auf die Abstandsleiste/n kann etwa auch dann verzichtet werden, wenn das Innenrohr wellenförmig ausgestaltet ist. In Fig. 8 ist eine solche besondere Ausführungsform dargestellt.On the spacer bar / n can be dispensed with approximately even if the inner tube is designed wave-shaped. In Fig. 8 such a particular embodiment is shown.

Hier setzt sich die Wellenform des Innenrohres 4 in Umfangsrichtung fort, während Fig. 9 einen Stator darstellt, bei dem das Innenrohr 4 wellenförmig in axialer Richtung verformt ist. Auch hier findet eine Umschließung des Innenrohres durch die Elastomermasse statt. Die Wellenform könnte sich etwa auch schraubenförmig um die Längsachse des Stators herum fortsetzen (hier nicht dargestellt).Here, the waveform of the inner tube 4 continues in the circumferential direction while Fig. 9 a stator, in which the inner tube 4 is deformed wave-shaped in the axial direction. Again, an enclosure of the inner tube by the elastomer mass takes place. The waveform could also continue approximately helically around the longitudinal axis of the stator (not shown here).

Claims (10)

  1. Stator for an eccentric spiral pump or an eccentric worm motor having a stator which comprises an outer pipe (1) with a lining (2) made of rubber or a rubber-like material and a hollow (3) formed in the manner of a dual- or multi-start coarse thread for accommodating a rigid rotor also formed in the manner of a coarse thread, wherein the coarse thread of the stator in each case comprises one start more than the coarse thread of the rotor, characterised in that an inner pipe (4) provided with through holes (5) is arranged in the lining (2).
  2. Stator according to Claim 1, characterised in that distance strips (6, 6', 6") are arranged between the inner pipe (4) and the outer pipe (1).
  3. Stator according to Claim 2, characterised in that the distance strips (6) is/are arranged substantially parallel to the longitudinal axis of the stator.
  4. Stator according to Claim 2, characterised in that one or a plurality of distance strips (6') is/are arranged in a helical manner around the circumference of the inner pipe (4) and running in the direction of its longitudinal axis.
  5. Stator according to Claim 2, characterised in that the distance strips (6") run substantially in the circumferential direction of the stator and enclose the inner pipe (4) in a circular manner.
  6. Stator according to Claims 2 to 5, characterised in that the distance strips (6, 6', 6") are made of plastic, elastomer and/or metal.
  7. Stator according to Claim 1, characterised in that the inner pipe (4) is designed in an undulating manner.
  8. Stator according to any one of the preceding claims, characterised in that the inner pipe (4) is welded on its front sides to the outer pipe (1).
  9. Stator according to any one of the preceding claims, characterised in that the outer pipe (1) and the inner pipe (4) are connected to each other by punctiform welds (9), wherein the welds (9) are made into bores pushing through the outer pipe (1).
  10. Stator according to any one of the preceding claims, characterised in that the outer pipe (1) comprises through holes.
EP04803161.1A 2003-11-17 2004-11-17 Stator for an eccentric spiral pump or an eccentric worm motor according to the moineau principle Ceased EP1733147B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/725,967 US7316548B2 (en) 2003-11-17 2003-11-17 Stator for an eccentric screw pump or an eccentric worm motor operating on the Moineau principle
PCT/EP2004/013029 WO2005047701A2 (en) 2003-11-17 2004-11-17 Stator for an eccentric spiral pump or an eccentric worm motor according to the moineau principle

Publications (2)

Publication Number Publication Date
EP1733147A2 EP1733147A2 (en) 2006-12-20
EP1733147B1 true EP1733147B1 (en) 2016-12-28

Family

ID=34574704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04803161.1A Ceased EP1733147B1 (en) 2003-11-17 2004-11-17 Stator for an eccentric spiral pump or an eccentric worm motor according to the moineau principle

Country Status (5)

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US (1) US7316548B2 (en)
EP (1) EP1733147B1 (en)
BR (1) BRPI0416634A (en)
CA (1) CA2473282C (en)
WO (1) WO2005047701A2 (en)

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US9163629B2 (en) 2006-07-31 2015-10-20 Schlumberger Technology Corporation Controlled thickness resilient material lined stator and method of forming
WO2011022124A1 (en) 2009-08-21 2011-02-24 Titeflex Corporation Energy dissipative tubes, sealing devices, and methods of fabricating and installing the same
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Also Published As

Publication number Publication date
BRPI0416634A (en) 2007-01-16
US7316548B2 (en) 2008-01-08
WO2005047701A3 (en) 2005-07-07
EP1733147A2 (en) 2006-12-20
CA2473282C (en) 2010-04-13
WO2005047701A2 (en) 2005-05-26
US20050106004A1 (en) 2005-05-19
CA2473282A1 (en) 2005-05-17

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