EP1738078B1 - Stator for an eccentric screw pump or an eccentric screw motor according to the moineau principle - Google Patents

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

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Publication number
EP1738078B1
EP1738078B1 EP04803164A EP04803164A EP1738078B1 EP 1738078 B1 EP1738078 B1 EP 1738078B1 EP 04803164 A EP04803164 A EP 04803164A EP 04803164 A EP04803164 A EP 04803164A EP 1738078 B1 EP1738078 B1 EP 1738078B1
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EP
European Patent Office
Prior art keywords
stator
lining
outer tube
eccentric screw
tube
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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.)
Expired - Fee Related
Application number
EP04803164A
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German (de)
French (fr)
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EP1738078A2 (en
Inventor
Sebastian Jäger
Reiner Kramer
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Artemis Kautschuk und Kunststoff Technik GmbH
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Artemis Kautschuk und Kunststoff Technik GmbH
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Priority to EP08018529.1A priority Critical patent/EP2028372B1/en
Publication of EP1738078A2 publication Critical patent/EP1738078A2/en
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Publication of EP1738078B1 publication Critical patent/EP1738078B1/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps

Definitions

  • the invention relates to a stator for an eccentric screw pump or an eccentric screw motor having an outer tube with a lining made of rubber or a rubber-like material and a shaped like a two- or multi-start helix cavity for receiving a rigid, also shaped like a helical rotor, wherein the stator has in each case one more gear than the coarse thread of the rotor.
  • stator of the aforementioned type 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 outer tube of this stator has a cylindrical shape.
  • stators are also known in which the shape of the outer tube is adapted to the shape of the cavity enclosed by the lining in such a way that the wall thickness of the lining, that is, the wall thickness of the lining Distance between the cavity and the outer tube is the same or almost the same throughout.
  • Rubber types such as HNBR, fluorine 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.
  • an adjustable elastomeric stator for an eccentric screw pump.
  • the adjustability is achieved in this stator in that its tubular jacket is perforated, whereby it is radially compressible.
  • an eccentric screw pump in which the stator casing and the eccentric screw stator are connected together at one end.
  • the eccentric screw stator further has a stabilizing sleeve which surrounds it, wherein the sleeve is vulcanized into the surface of the eccentric screw stator.
  • the stabilization sleeve may be a perforated sheet metal sleeve.
  • the object of the invention is to provide an eccentric screw pump which has a resistant to mechanical or chemical attack linings.
  • the apertures having pipes thus effect the connection between the outer tube and the lining.
  • the perforations having the tubes are preferably made of metal.
  • the stator has according to the invention two telescoped, perforated inner tubes with significantly different hole diameters. This has the advantage that voids arise that result in rubber-filled undercuts. A radial displacement of the lining under load is thereby effectively prevented.
  • the inner tube of the two openings having pipes is naturally more enclosed during introduction of the liner of this than the inner tube, which is closer to the outer tube.
  • the latter tube acts more or less as a spacer and has the task to ensure a minimum distance between the inner - having perforations - tube and the outer tube.
  • the lining may completely or nearly completely enclose the inner tube.
  • the lining also has contact with the outer tube, namely through the apertures, which has the middle tube.
  • the gumming ie the introduction of the elastomer liner in the outer tube without a bond-friendly pretreatment of the metal surfaces, such as by using an adhesion promoter, take place.
  • the gumming can also by using a chemical bonding system, eg. B. a bonding agent done. If, in fact, the chemical bond between rubber and metal in use is destroyed chemically, by the action of heat and / or by mechanical action, the mechanical locking furthermore ensures the function of the stator.
  • the in Fig. 1 Stator shown has an outer tube 1 made of a solid material z. As steel, in the interior of which the inner tubes 2 and 3 are located.
  • the outer tube 1 closest inner tube 2 has openings 4.
  • the inner tube 2 In the inner tube 2 is the inner tube 3.
  • the lining 6 of the outer tube is in Fig. 1 not shown.
  • the openings 4 of the inner tube 2 and the openings 5 of the inner tube 3 are different sizes in an advantageous embodiment of the invention, in particular, the openings 4 are larger-this allows the elastomeric material of the liner enclose the inner tube 3 through the openings 5, so that a particularly Good adhesion between the lining 6 and the inner tube 3 and the outer tube 1 is formed.
  • the inner tube 3 is almost embedded in the elastomer composition. 6
  • Fig. 2 is a cross section of a stator shown as in Fig. 1 is shown.
  • the inner tubes 2 and 3 which have the openings 4 and 5 in the outer tube 1.
  • the lining 6 is shown in the outer tube 1.
  • the lining 6 surrounds the bore 7, which is only roughly shown here.
  • the bore 7 forms the space for receiving the material to be conveyed (pump cavity) if the stator is used in an eccentric screw pump, or the space for receiving the flowing drive means, if the stator is part of a used as a motor device.
  • the bore 7 extends over the entire length of the stator. It is spiral-wound in two or more orbits and serves to receive a rotor, not shown here.
  • the forces occurring during use of the pump are absorbed by the lining 6 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. This is done according to the invention by the inner tubes 2 and 3.
  • the inner tubes 2 and 3 are arranged, which have a perforation or a plurality of openings 4 and 5 respectively.
  • the openings 4 and 5 are filled by the material of the lining 6.
  • a connection made by vulcanization or gluing between outer tube and lining can be omitted.
  • the gluing or vulcanization is dispensed with.
  • the bore 7 is helically wound.
  • the outer tube 1 is shaped so that it runs parallel or nearly parallel to the outer contours of the cavity 7.
  • a same, at least almost equal wall thickness of the lining 6 is achieved, which has proven to be advantageous in certain applications compared to stators with cylindrically shaped outer tubes.
  • the inner tubes 2 and 3 can be formed by commercially available perforated plates, which are bent cylindrically. To produce a stator according to the invention, the inner tubes 2 and 3 are inserted into the outer tube 1 and all tubes 1, 2 and 3 are brought into the desired coiled shape. But it is also possible to first deform the tubes 1, 2 and 3 separately from each other, then put them together, such as by the inner tubes 2 and 3 are screwed into the outer tube 1. Subsequently, the rubber material of the lining 2 can be introduced by spraying.
  • the inner tube 2 also from a hose made of elastomeric material or the like., In particular rubber exist.
  • This hose not shown, is pushed over the inner tube 3.
  • the inner tube 3 and the tube are then spent in the outer tube 1.
  • the tube can also - as the inner tube 2 - have perforations, in which the elastomeric material of the liner 6 can flow.
  • stator is made without a firmly adhering connection between the outer tube 1 and lining 2
  • a mechanical, positive connection between the lining 2 and the inner tube 4 is formed, in contrast to stators with a chemical rubber-metal compound but can not be excluded be that it comes through a gap between the outer tube 1 and the liner 2 to a leakage and thus to a pressure drop between the suction side and pressure side of the pump. This can be prevented by a clamping seal at the front ends of the lining 2. Two embodiments of such a clamping gasket will be explained below with reference to FIGS. 3 and 4.
  • the outer tube 1 may also have openings. It is not mandatory that the outer tube has a closed surface.

Description

Die Erfindung betrifft einen Stator für eine Exzenterschneckenpumpe oder einen Exzenterschneckenmotor, 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 der Stator jeweils einen Gang mehr aufweist als das Steilgewinde des Rotors.The invention relates to a stator for an eccentric screw pump or an eccentric screw motor having an outer tube with a lining made of rubber or a rubber-like material and a shaped like a two- or multi-start helix cavity for receiving a rigid, also shaped like a helical rotor, wherein the stator has 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 ein 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. Das Außenrohr dieses Stators hat eine zylinderische Form. Bekannt sind aber auch Statoren, bei denen die Form des Außenrohrs der Form des von der Auskleidung umschlossenen Hohlraumes dergestalt angeglichen ist, dass die Wandstärke der Auskleidung, also der Abstand zwischen dem Hohlraum und dem Außenrohr durchgehend gleich oder nahezu gleich ist. Bei beiden Ausführungsformen der zuvor genannten Statoren besteht die Gefahr, dass sich die festhaftende Verbindung zwischen Auskleidung und Außenrohr löst, vor allem dann, wenn der Stator während des Betriebes hohe Temperaturen und/oder chemischen Belastungen ausgesetzt ist. Selbst wenn die Auskleidung diesen Belastungen standhält, kann es zu einem Ablösen vom Außenrohr kommen, wenn ein Haftvermittler verwendet wird, der entweder den thermischen und/oder chemischen Bedingungen nicht standhält.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 aforementioned type 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 outer tube of this stator has a cylindrical shape. However, stators are also known in which the shape of the outer tube is adapted to the shape of the cavity enclosed by the lining in such a way that the wall thickness of the lining, that is, the wall thickness of the lining Distance between the cavity and the outer tube is the same or almost the same throughout. In both embodiments of the aforementioned stators there is a risk that the adherent connection between liner and outer tube dissolves, especially when the stator is exposed during operation high temperatures and / or chemical stress. Even if the liner withstands these stresses, it may come off the outer tube when using a primer that does not withstand the thermal and / or chemical conditions.

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, fluorine 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 DE 2 250 263 A1 ist ein nachstellbarer gummielastischer Stator für eine Exzenterschneckenpumpe offenbart. Die Nachstellbarkeit wird bei diesem Stator dadurch erreicht, dass sein rohrförmiger Mantel gelocht ist, wodurch er radial zusammendrückbar ist.In the DE 2 250 263 A1 is disclosed an adjustable elastomeric stator for an eccentric screw pump. The adjustability is achieved in this stator in that its tubular jacket is perforated, whereby it is radially compressible.

Aus der DE 198 42 754 A1 ist eine Exenterschneckenpumpe bekannt, bei der der Statormantel und der Exzenterschneckenstator an einem Ende miteinander verbunden sind. Der Exzenterschneckenstator weist weiterhin eine Stabilisierungshülse auf, die ihn umgibt, wobei die Hülse in die Oberfläche des Exzenterschneckenstators einvulkanisiert ist. Bei der Stabilisierungshülse kann es sich um eine Lochblechhülse handeln. Durch diese Maßnahme soll die Druckstabilität der Pumpe erhöht werden.From the DE 198 42 754 A1 For example, an eccentric screw pump is known in which the stator casing and the eccentric screw stator are connected together at one end. The eccentric screw stator further has a stabilizing sleeve which surrounds it, wherein the sleeve is vulcanized into the surface of the eccentric screw stator. The stabilization sleeve may be a perforated sheet metal sleeve. By this measure, the pressure stability of the pump should be increased.

Aufgabe der Erfindung ist es, eine Exzenterschneckenpumpe zu schaffen, die über eine gegen mechanische oder chemische Angriffe widerstandsfähige Auskleidungen verfügt.The object of the invention is to provide an eccentric screw pump which has a resistant to mechanical or chemical attack linings.

Zur Lösung dieser Aufgabe sind erfindungsgemäß in der Auskleidung zwei Durchbrechungen aufweisende Rohre angeordnet.To achieve this object, two perforations having tubes are arranged according to the invention in the lining.

Zwischen der Gummischicht und den Durchbrechungen aufweisenden Rohren kommt es zu einer mechanischen Verkrallung bzw. einer formschlüssigen Verbindung. Die Durchbrechungen aufweisenden Rohre bewirken somit die Verbindung zwischen dem Außenrohr und der Auskleidung. Die die Durchbrechungen aufweisenden Rohre bestehen vorzugsweise aus Metall.Between the rubber layer and the openings having pipes there is a mechanical Verkrallung or a positive connection. The apertures having pipes thus effect the connection between the outer tube and the lining. The perforations having the tubes are preferably made of metal.

Der Stator weist nach der Erfindung zwei ineinander geschobene, gelochte Innenrohre mit deutlich unterschiedlichen Lochdurchmessern auf. Das hat den Vorteil, dass sich Hohlräume ergeben, die mit Gummi ausgefüllte Hinterschneidungen ergeben. Ein radiales Verlagern der Auskleidung unter Belastung wird dadurch wirksam verhindert.The stator has according to the invention two telescoped, perforated inner tubes with significantly different hole diameters. This has the advantage that voids arise that result in rubber-filled undercuts. A radial displacement of the lining under load is thereby effectively prevented.

Das innere Rohr der beiden Durchbrechungen aufweisenden Rohre wird beim Einbringen der Auskleidung von dieser naturgemäß mehr umschlossen als das Innenrohr, welches dem Außenrohr näher liegt. Das letztgenannte Rohr fungiert quasi als Abstandshalter und hat die Aufgabe, einen Mindestabstand zwischen dem inneren - Durchbrechungen aufweisenden - Rohr und dem Außenrohr zu gewährleisten. Die Auskleidung kann das innere Rohr vollständig oder nahezu vollständig umschließen. Die Auskleidung hat zudem Kontakt mit dem Außenrohr, nämlich durch die Durchbrechungen hindurch, welches das mittlere Rohr aufweist.The inner tube of the two openings having pipes is naturally more enclosed during introduction of the liner of this than the inner tube, which is closer to the outer tube. The latter tube acts more or less as a spacer and has the task to ensure a minimum distance between the inner - having perforations - tube and the outer tube. The lining may completely or nearly completely enclose the inner tube. The lining also has contact with the outer tube, namely through the apertures, which has the middle tube.

Bei der Herstellung des erfindungsgemäßen Stators kann die Gummierung, d.h. das Einbringen der Elastomer-Auskleidung in das Außenrohr ohne eine bindungsfreundliche Vorbehandlung der Metalloberflächen, etwa durch Verwendung eines Haftvermittlers, erfolgen. Die Gummierung kann jedoch auch unter Einsatz eines chemischen Bindungssystems, z. B. eines Haftvermittlers, erfolgen. Sollte nämlich die chemische Bindung zwischen Gummi und Metall im Einsatz chemisch, durch Hitzeeinwirkung und/oder durch mechanische Einwirkung zerstört werden, gewährleistet die mechanische Verkrallung weiterhin die Funktion des Stators.In the production of the stator according to the invention, the gumming, ie the introduction of the elastomer liner in the outer tube without a bond-friendly pretreatment of the metal surfaces, such as by using an adhesion promoter, take place. However, the gumming can also by using a chemical bonding system, eg. B. a bonding agent done. If, in fact, the chemical bond between rubber and metal in use is destroyed chemically, by the action of heat and / or by mechanical action, the mechanical locking furthermore ensures the function of the stator.

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
eine perspektivische Darstellung einer Ausführungsform der Erfindung mit teilweise freigelegten Schichten (ohne Auskleidung), und
Fig. 2
einen Querschnitt durch den Stator gemäß Fig. 1
Show it:
Fig. 1
a perspective view of an embodiment of the invention with partially exposed layers (without lining), and
Fig. 2
a cross section through the stator according to Fig. 1

Der in Fig. 1 dargestellte Stator weist ein Außenrohr 1 aus einem festen Werkstoff z. B. Stahl, auf, in dessen Innerem sich die Innenrohre 2 und 3 befinden. Das dem Außenrohr 1 nächstliegende Innenrohr 2 weist Durchbrechungen 4 auf.The in Fig. 1 Stator shown has an outer tube 1 made of a solid material z. As steel, in the interior of which the inner tubes 2 and 3 are located. The outer tube 1 closest inner tube 2 has openings 4.

In dem Innenrohr 2 befindet sich das Innenrohr 3. Die Auskleidung 6 des Außenrohres ist in Fig. 1 nicht dargestellt.In the inner tube 2 is the inner tube 3. The lining 6 of the outer tube is in Fig. 1 not shown.

Die Durchbrechungen 4 des Innenrohres 2 und die Durchbrechungen 5 des Innenrohres 3 sind in einer vorteilhaften Ausführungsform der Erfindung unterschiedlich groß, insbesondere sind die Durchbrechungen 4 größer-Hierdurch kann das Elastomermaterial der Auskleidung das Innenrohr 3 durch die Durchbrechungen 5 hindurch umschließen, so dass eine besonders gute Haftung zwischen der Auskleidung 6 und dem Innenrohr 3 und zu dem Außenrohr 1 entsteht. Das Innenrohr 3 wird nahezu eingebettet in die Elastomermasse 6.The openings 4 of the inner tube 2 and the openings 5 of the inner tube 3 are different sizes in an advantageous embodiment of the invention, in particular, the openings 4 are larger-this allows the elastomeric material of the liner enclose the inner tube 3 through the openings 5, so that a particularly Good adhesion between the lining 6 and the inner tube 3 and the outer tube 1 is formed. The inner tube 3 is almost embedded in the elastomer composition. 6

In Fig. 2 ist ein Querschnitt eines Stators dargestellt, wie er in Fig. 1 abgebildet ist. Auch hier befinden sich in dem Außenrohr 1 die Innenrohre 2 und 3, welche die Durchbrechungen 4 bzw. 5 aufweisen. Weiterhin ist die Auskleidung 6 im Außenrohr 1 dargestellt. Die Auskleidung 6 umschließt die Bohrung 7, welche hier nur grob dargestellt ist.In Fig. 2 is a cross section of a stator shown as in Fig. 1 is shown. Here, too, are the inner tubes 2 and 3, which have the openings 4 and 5 in the outer tube 1. Furthermore, the lining 6 is shown in the outer tube 1. The lining 6 surrounds the bore 7, which is only roughly shown here.

Die Bohrung 7 bildet den Raum zur Aufnahme 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. Die Bohrung 7 erstreckt sich über die gesamte Länge des Stators. Sie 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 6 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. Dieses geschieht erfindungsgemäß durch die Innenrohre 2 und 3.The bore 7 forms the space for receiving the material to be conveyed (pump cavity) if the stator is used in an eccentric screw pump, or the space for receiving the flowing drive means, if the stator is part of a used as a motor device. The bore 7 extends over the entire length of the stator. It is spiral-wound in two or more orbits and serves to receive a rotor, not shown here. The forces occurring during use of the pump are absorbed by the lining 6 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. This is done according to the invention by the inner tubes 2 and 3.

Wichtig ist nun, dass in dem Außenrohr 1 die Innenrohre 2 und 3 angeordnet sind, die eine Perforierung bzw. eine Vielzahl von Durchbrechungen 4 bzw. 5 aufweisen. Die Durchbrechungen 4 und 5 werden von dem Material der Auskleidung 6 ausgefüllt. Dadurch kommt es zu einer formschlüssigen Verbindung zwischen dem Außenrohr 1, den Innenrohren 2 und 3 und der Auskleidung 6, so dass die Auskleidung 2 sowohl gegen Verschiebung in Längsrichtung als auch gegen Verdrehen um ihre Achse gesichert ist. Eine durch Vulkanisation oder Kleben hergestellte Verbindung zwischen Außenrohr und Auskleidung kann entfallen. Für die Erfindung ist es jedoch nicht zwingend, dass auf die das Kleben oder die Vulkanisation verzichtet wird.It is now important that in the outer tube 1, the inner tubes 2 and 3 are arranged, which have a perforation or a plurality of openings 4 and 5 respectively. The openings 4 and 5 are filled by the material of the lining 6. This results in a positive connection between the outer tube 1, the inner tubes 2 and 3 and the lining 6, so that the lining 2 is secured both against displacement in the longitudinal direction and against rotation about its axis. A connection made by vulcanization or gluing between outer tube and lining can be omitted. For the invention, however, it is not mandatory that the gluing or vulcanization is dispensed with.

Wie bereits erwähnt, ist die Bohrung 7 schneckenförmig gewunden. Das Außenrohr 1 ist so geformt, dass es parallel oder nahezu parallel zu den Aussenkonturen des Hohlraumes 7 verläuft. Dadurch wird eine gleiche, zumindest nahezu gleiche Wandstärke der Auskleidung 6 erreicht, was sich bei bestimmten Anwendungen als vorteilhaft erwiesen hat gegenüber Statoren mit zylindrisch geformten Außenrohren.As already mentioned, the bore 7 is helically wound. The outer tube 1 is shaped so that it runs parallel or nearly parallel to the outer contours of the cavity 7. As a result, a same, at least almost equal wall thickness of the lining 6 is achieved, which has proven to be advantageous in certain applications compared to stators with cylindrically shaped outer tubes.

Die Innenrohre 2 und 3 können durch handelsübliche Lochbleche gebildet werden, die zylindrisch gebogen werden. Zur Herstellung eines erfindungsgemäßen Stators werden die Innenrohre 2 und 3 in das Außenrohr 1 eingesetzt und alle Rohre 1, 2 und 3 in die gewünschte gewendelte Form gebracht. Möglich ist aber auch die Rohre 1, 2 und 3 zunächst getrennt von einander zu verformen, um sie sodann zusammenzufügen, etwa indem die Innenrohre 2 und 3 in das Außenrohr 1 hineingedreht werden. Anschließend kann durch Spritzen das Gummimaterial der Auskleidung 2 eingebracht werden.The inner tubes 2 and 3 can be formed by commercially available perforated plates, which are bent cylindrically. To produce a stator according to the invention, the inner tubes 2 and 3 are inserted into the outer tube 1 and all tubes 1, 2 and 3 are brought into the desired coiled shape. But it is also possible to first deform the tubes 1, 2 and 3 separately from each other, then put them together, such as by the inner tubes 2 and 3 are screwed into the outer tube 1. Subsequently, the rubber material of the lining 2 can be introduced by spraying.

Nach einer vorteilhaften Ausführungsform kann das Innenrohr 2 auch aus einem Schlauch aus Elastomermaterial oder dergl., insbesondere Gummi, bestehen. Dieser nicht dargestellte Schlauch wird über das Innenrohr 3 geschoben. Das Innenrohr 3 und der Schlauch werden sodann in das Außenrohr 1 verbracht. Es versteht sich von selbst, dass der Schlauch auch - wie das Innenrohr 2 - Durchbrechungen aufweisen kann, in die das Elastomermaterial der Auskleidung 6 fließen kann.According to an advantageous embodiment, the inner tube 2 also from a hose made of elastomeric material or the like., In particular rubber exist. This hose, not shown, is pushed over the inner tube 3. The inner tube 3 and the tube are then spent in the outer tube 1. It goes without saying that the tube can also - as the inner tube 2 - have perforations, in which the elastomeric material of the liner 6 can flow.

Im Falle, dass der Stator ganz ohne eine festhaftende Verbindung zwischen Außenrohr 1 und Auskleidung 2 hergestellt wird, entsteht zwar eine mechanische, formschlüssige Verbindung zwischen der Auskleidung 2 und dem Innenrohr 4, im Gegensatz zu Statoren mit einer chemischen Gummi-MetallVerbindung kann aber nicht ausgeschlossen werden, dass es über einen Spalt zwischen dem Außenrohr 1 und der Auskleidung 2 zu einer Leckage und damit zu einem Druckabfall zwischen Saugseite und Druckseite der Pumpe kommt. Dies kann durch eine Klemmdichtung an den stirnseitigen Enden der Auskleidung 2 verhindert werden. Zwei Ausführungsbeispiele für eine derartige Klemmdichtung sollen im Folgenden anhand der Fig. 3 und 4 erläutert werden.In the event that the stator is made without a firmly adhering connection between the outer tube 1 and lining 2, although a mechanical, positive connection between the lining 2 and the inner tube 4 is formed, in contrast to stators with a chemical rubber-metal compound but can not be excluded be that it comes through a gap between the outer tube 1 and the liner 2 to a leakage and thus to a pressure drop between the suction side and pressure side of the pump. This can be prevented by a clamping seal at the front ends of the lining 2. Two embodiments of such a clamping gasket will be explained below with reference to FIGS. 3 and 4.

Nach einer hier nicht dargestellten Ausführungsform der Erfindung kann das Außenrohr 1 ebenfalls Durchbrechungen aufweisen. Es ist nicht zwingend, dass das Außenrohr eine geschlossene Oberfläche besitzt.According to an embodiment of the invention, not shown here, the outer tube 1 may also have openings. It is not mandatory that the outer tube has a closed surface.

Claims (7)

  1. Stator for an eccentric screw pump or an eccentric screw motor, which has an outer tube (1) with a lining (6) made of rubber or a rubber-like material and has a hollow space, shaped in the manner of a two- or multi-start quick-acting screw thread, for accommodating a rigid rotor, likewise shaped in the manner of a quick-acting screw thread, the stator having in each case one start more than the quick-acting screw thread of the rotor, and the outer tube (1) being shaped in such a manner that the wall thickness of the lining (6) is uniform or at least nearly uniform, characterised in that two inner tubes (2, 3) having apertures are arranged in the lining (6).
  2. Stator according to Claim 1, characterised in that the inner tubes (2, 3) are made of metal.
  3. Stator according to Claim 1, characterised in that the apertures (4, 5) of the two inner tubes (2, 3) differ in size and number.
  4. Stator according to Claim 1, characterised in that the second inner tube (3), which is arranged in the first inner tube (2), has apertures (5) with a smaller diameter, but in greater number than the first inner tube (2).
  5. Stator according to Claim 1, characterised in that the inner tube (3) is surrounded by a hose made of elastomer, in particular made of rubber, instead of the second inner tube (2).
  6. Stator according to Claim 5, characterised in that the hose has apertures.
  7. Method for producing a stator according to Claim 1, characterised in that the outer tube (1) and the inner tubes (2, 3) are produced from cylindrical tubes, which are first put together and connected to one another and subsequently have the helical shape impressed upon them.
EP04803164A 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor according to the moineau principle Expired - Fee Related EP1738078B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08018529.1A EP2028372B1 (en) 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor in accordance with the Moineau principle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/714,812 US7131827B2 (en) 2003-11-17 2003-11-17 Stator for an eccentric screw pump or an eccentric worm motor operating on the moineau principle
PCT/EP2004/013037 WO2005047702A2 (en) 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor according to the moineau principle

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP08018529.1A Division EP2028372B1 (en) 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor in accordance with the Moineau principle

Publications (2)

Publication Number Publication Date
EP1738078A2 EP1738078A2 (en) 2007-01-03
EP1738078B1 true EP1738078B1 (en) 2009-05-20

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EP04803164A Expired - Fee Related EP1738078B1 (en) 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor according to the moineau principle
EP08018529.1A Expired - Fee Related EP2028372B1 (en) 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor in accordance with the Moineau principle

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EP08018529.1A Expired - Fee Related EP2028372B1 (en) 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor in accordance with the Moineau principle

Country Status (6)

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US (2) US7131827B2 (en)
EP (2) EP1738078B1 (en)
BR (1) BRPI0416662B1 (en)
CA (2) CA2473001C (en)
DE (1) DE502004009512D1 (en)
WO (1) WO2005047702A2 (en)

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DE102020004334A1 (en) 2020-07-20 2022-01-20 Wilhelm Kächele GmbH Stator for progressing cavity machine
DE102021130260A1 (en) 2021-11-19 2023-05-25 Wilhelm Kächele GmbH Stator for eccentric screw machine and manufacturing method for this

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DE102008054961A1 (en) * 2008-12-19 2010-07-01 Endress + Hauser Flowtec Ag Flow meter and method of making a meter tube of a flow meter
JP5364461B2 (en) * 2009-06-17 2013-12-11 宇明泰化工股▲ふん▼有限公司 Polytetrafluoroethylene twisted yarn and method for producing the same
US8523545B2 (en) * 2009-12-21 2013-09-03 Baker Hughes Incorporated Stator to housing lock in a progressing cavity pump
GB2481226A (en) * 2010-06-16 2011-12-21 Nat Oilwell Varco Lp Stator for a progressive cavity (PC) pump or motor
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DE102012112044B4 (en) * 2012-05-04 2015-10-08 Netzsch Pumpen & Systeme Gmbh Self-fixing stator housing
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DE102020004334A1 (en) 2020-07-20 2022-01-20 Wilhelm Kächele GmbH Stator for progressing cavity machine
WO2022017874A1 (en) 2020-07-20 2022-01-27 Wilhelm Kächele GmbH Stator for an eccentric screw machine
DE102021130260A1 (en) 2021-11-19 2023-05-25 Wilhelm Kächele GmbH Stator for eccentric screw machine and manufacturing method for this
WO2023088785A1 (en) 2021-11-19 2023-05-25 Wilhelm Kächele GmbH Stator for an eccentric screw machine and production method for same

Also Published As

Publication number Publication date
EP2028372B1 (en) 2015-07-29
US20050106052A1 (en) 2005-05-19
EP2028372A3 (en) 2014-08-27
US7329106B2 (en) 2008-02-12
WO2005047702A2 (en) 2005-05-26
WO2005047702A3 (en) 2005-11-24
EP2028372A2 (en) 2009-02-25
EP1738078A2 (en) 2007-01-03
CA2712364C (en) 2013-08-27
US20070053783A1 (en) 2007-03-08
DE502004009512D1 (en) 2009-07-02
CA2473001A1 (en) 2005-05-17
CA2473001C (en) 2011-04-19
BRPI0416662A (en) 2007-01-16
CA2712364A1 (en) 2005-05-17
BRPI0416662B1 (en) 2017-02-07
US7131827B2 (en) 2006-11-07

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