EP2028372B1 - Stator for an eccentric screw pump or an eccentric screw motor in accordance with the Moineau principle - Google Patents

Stator for an eccentric screw pump or an eccentric screw motor in accordance with the Moineau principle Download PDF

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Publication number
EP2028372B1
EP2028372B1 EP08018529.1A EP08018529A EP2028372B1 EP 2028372 B1 EP2028372 B1 EP 2028372B1 EP 08018529 A EP08018529 A EP 08018529A EP 2028372 B1 EP2028372 B1 EP 2028372B1
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EP
European Patent Office
Prior art keywords
outer tube
stator
lining
sealing ring
eccentric screw
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.)
Expired - Fee Related
Application number
EP08018529.1A
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German (de)
French (fr)
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EP2028372A2 (en
EP2028372A3 (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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Publication of EP2028372A2 publication Critical patent/EP2028372A2/en
Publication of EP2028372A3 publication Critical patent/EP2028372A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • 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-pitch thread 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.
  • stators of the type mentioned in which the liner is adhesively bonded to an outer tube, that is, 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, ie the distance between the cavity and the outer tube, is the same or almost the same.
  • an eccentric screw pump for spray guns.
  • a diaphragm seal is installed between the pump and a delivery line.
  • This has a tubular housing and a clamped in this piece of tubing. Between the hose and the housing thereby filled with hydraulic fluid pressure chamber is formed, to which a meter is connected.
  • the ends of the tube piece are secured by means of screwed onto the housing union nuts, which are provided with pressure pieces, which press the ends of the tube piece to the housing.
  • 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 an eccentric screw pump or an eccentric screw motor according to the Moineau principle, which has an improved tightness in the region of the end face of the lining.
  • the in Fig. 1 Stator shown has an outer tube 1 made of a solid material, for. 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 1 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 in size, in particular, the openings 4 are larger.
  • the elastomer material of the lining surround the inner tube 3 through the openings 5, so that a particularly good adhesion between the lining 6 and the inner tube 3 and to 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 a 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 6 must therefore be taken care of. This happens through 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. 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 6 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.
  • 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.
  • the inner tubes 2 and 3 can be formed by commercially available perforated plates, which are bent cylindrically. To produce the stator, 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. It is also possible, however, initially to deform the tubes 1, 2, and 3 separately from one another in order to then join them together, for instance by screwing the inner tubes 2 and 3 into the outer tube 1. Subsequently, the rubber material of the lining 6 can be introduced by spraying.
  • stator is made entirely without a firmly adhering connection between outer tube 1 and lining 6, although a mechanical, positive connection between the lining 6 and the inner tube 2 is formed, in contrast to stators with a chemical rubber-metal compound but can It can not be ruled out that leakage will occur through a gap between the outer tube 1 and the lining 6, resulting in a pressure drop between the suction side and the pressure side of the pump.
  • This can be prevented according to the invention by a clamping seal at the front ends of the lining 2. Two embodiments of such a clamping gasket will be described below with reference to the Fig. 3 and 4 be explained.
  • a conical sealing ring 10 is provided, which has a cylindrical portion 11, a conical portion 12 and a sealing bead 13.
  • the conical portion 12 is spaced from the inside of the outer tube 1 and formed so that its distance from the outer tube 1 increases toward the interior of the stator.
  • the sealing ring 10 is connected via a weld 14 to the outer tube 1.
  • the sealing ring 10 may be connected by a press fit with the outer tube 1 instead of a welded joint.
  • a clamping ring 15 is arranged on the sealing ring 10, which has a cylindrical portion 16, a conical portion 17 and a stop 18.
  • the sealing ring 10 is introduced into the outer tube 1, positioned and possibly fixed there before the material (rubber) of the lining 6 is introduced into the outer tube 1.
  • the clamping ring 15 is pressed axially.
  • the wall thickness of the clamping ring 15 is greater in the conical portion 17 than the wall thickness of the conical portion 12 of the sealing ring 10.
  • a simple sealing ring 20 is provided in the embodiment according to Fig. 4 .
  • This sealing ring 20 is suitable for installation after the introduction of the lining 6 in the outer tube 1.
  • the liner 6 made of rubber or similar material is connected to the pipes 1 and 2 via the injection process.
  • the end portion 21 of the lining 6 z. B. shaped as shown at 22 in dashed lines.
  • the sealing ring 20 which is partially conical, is inserted into the outer tube 1.
  • the end region 21 of the lining 6 is compressed by the conical region 24 of the sealing ring 20 and pressed firmly against the outer tube 1.
  • the sealing ring 20 may, as shown at 23, connected by a weld with the outer tube 1 and secured against axial displacement. According to another embodiment of the invention, the Seal 20 also be secured against displacement by a press fit between the sealing ring 20 and the outer tube 1.
  • Fig. 3 and 4 possibilities for sealing are shown. It is understood that these seals can be applied both in such stators, which z. B. have no coiled, but a cylindrical outer tube, as well as for coiled stators according to the Fig. 1 and 2 are suitable.
  • the outer tube 1 may also have openings. It is not mandatory that the outer tube 1 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-pitch thread 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 einem Außenrohr verbunden ist, d. h. durch chemische Bindung zwischen der elastomeren Auskleidung und einem metallischen Außenrohr. Das Außenrohr dieses Stators hat eine zylindrische 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 hohen 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 den 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 type mentioned is known in which the liner is adhesively bonded to an outer tube, that is, 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, ie the distance between the cavity and the outer tube, is the same or almost the same. 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 to high temperatures and / or chemical stress during operation. Even if the lining withstands these stresses, it may peel off the outer tube when using a primer that does not withstand either thermal and / or chemical conditions.

Ein weiterer gattungsgemäßer Stator für eine Exzenterschneckenpumpe ist in der DE 198 27 101 A1 offenbart, der ein Außenrohr aus hochfestem Stahl und ein ebenfalls aus Stahl gefertigtes Innenrohr aufweist, welches mit einer haftenden Gummischicht ausgekleidet ist. Diese Auskleidung umschließt einen nach Art eines zwei- oder mehrgängigen Steilgewindes geformten Hohlraum zur Aufnahme eines starren, ebenfalls nach Art eines Steilgewindes geformten Rotors. An beiden Enden des Innenrohres sind Scheibenringe angeordnet, die mit dem Außenrohr verbunden sind, um Axialverschiebungen und Verdrehungen des Innenrohres zu verhindern. Darüber hinaus dienen die Scheibenringe der Abdichtung des Innenrohres gegenüber dem Außenrohr, um Bypässe zwischen diesen beiden Bauteilen zu verhindern.Another generic stator for an eccentric screw pump is in the DE 198 27 101 A1 discloses an outer tube made of high-strength steel and also made of steel inner tube, which is lined with an adhesive rubber layer. This lining encloses a cavity formed in the manner of a two- or multi-start helical thread for receiving a rigid rotor, which is likewise shaped in the manner of a coarse thread. At both ends of the inner tube disc rings are arranged, which are connected to the outer tube to prevent axial displacements and torsions of the inner tube. In addition, the disc rings serve to seal the inner tube from the outer tube to prevent bypasses between these two components.

In der DE 299 09 039 U1 ist eine Exzenterschneckenpumpebeispielsweise für Spritzputzgeräte beschrieben. Um den Förderdruck der Pumpe überwachen zu können, ist zwischen der Pumpe und einer Förderleitung ein Druckmittler eingebaut. Dieser weist ein rohrförmiges Gehäuse und ein in dieses eingespanntes Schlauchstück auf. Zwischen dem Schlauch und dem Gehäuse ist dadurch ein mit Hydraulikflüssigkeit gefüllter Druckraum gebildet, an den ein Messgerät angeschlossen ist. Die Enden des Schlauchstückes sind mit Hilfe von auf das Gehäuse aufgeschraubten Überwurfmuttern befestigt, die dazu mit Druckstücken versehen sind, welche die Enden des Schlauchstückes an das Gehäuse pressen.In the DE 299 09 039 U1 For example, an eccentric screw pump is described for spray guns. In order to monitor the delivery pressure of the pump, a diaphragm seal is installed between the pump and a delivery line. This has a tubular housing and a clamped in this piece of tubing. Between the hose and the housing thereby filled with hydraulic fluid pressure chamber is formed, to which a meter is connected. The ends of the tube piece are secured by means of screwed onto the housing union nuts, which are provided with pressure pieces, which press the ends of the tube piece to the housing.

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.

Aufgabe der vorliegenden Erfindung ist es, eine Exzenterschneckenpumpe oder einen Exzenterschneckenmotor nach dem Moineau-Prinzip zu schaffen, die bzw. der eine verbesserte Dichtheit im Bereich der Stirnseite der Auskleidung aufweist.The object of the present invention is to provide an eccentric screw pump or an eccentric screw motor according to the Moineau principle, which has an improved tightness in the region of the end face of the lining.

Diese Aufgabe wird erfindungsgemäß mit einem Stator gelöst, der die Merkmale des Anspruchs 1 aufweist.This object is achieved with a stator having the features of claim 1.

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 eines Stators mit teilweise freigelegten Schichten (ohne Auskleidung)
Fig. 2
einen Querschnitt durch den Stator gem. Fig. 1
Fig. 3
einen Längsschnitt durch das Endstück eines erfindungsgemäßen Stators, und
Fig. 4
einen Längsschnitt durch das Endstück eines weiteren erfindungsgemäßen Stators.
Show it:
Fig. 1
a perspective view of a stator with partially exposed layers (without lining)
Fig. 2
a cross section through the stator acc. Fig. 1
Fig. 3
a longitudinal section through the end of a stator according to the invention, and
Fig. 4
a longitudinal section through the tail of another stator according to the invention.

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, for. 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 1 ist in Fig. 1 nicht dargestellt.In the inner tube 2 is the inner tube 3. The lining 6 of the outer tube 1 is in Fig. 1 not shown.

Die Durchbrechungen 4 des Innenrohres 2 und die Durchbrechungen 5 des Innenrohres 3 sind 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 in size, in particular, the openings 4 are larger. As a result, the elastomer material of the lining surround the inner tube 3 through the openings 5, so that a particularly good adhesion between the lining 6 and the inner tube 3 and to 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 umschfießt eine 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 a 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 6 muss daher gesorgt sein. Dieses geschieht 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 6 must therefore be taken care of. This happens through the inner tubes 2 and 3.

In dem Außenrohr 1 sind die Innenrohre 2 und 3 angeordnet, 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 6 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.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 6 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.

Wie bereits erwähnt, ist die Bohrung 7 schneckenförmig gewunden.As already mentioned, the bore 7 is helically wound.

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.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 des 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 voneinander 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 6 eingebracht werden.The inner tubes 2 and 3 can be formed by commercially available perforated plates, which are bent cylindrically. To produce the stator, 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. It is also possible, however, initially to deform the tubes 1, 2, and 3 separately from one another in order to then join them together, for instance by screwing the inner tubes 2 and 3 into the outer tube 1. Subsequently, the rubber material of the lining 6 can be introduced by spraying.

Nach einer vorteilhaften Ausführungsform kann das Innenrohr 2 auch aus einem Schlauch aus Elastomermaterial oder dergleichen, 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 may also consist of a hose made of elastomeric material or the like, in particular rubber. 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 hose too
  • as the inner tube 2 - can have openings, 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 6 hergestellt wird, entsteht zwar eine mechanische, formschlüssige Verbindung zwischen der Auskleidung 6 und dem Innenrohr 2, im Gegensatz zu Statoren mit einer chemischen Gummi-Metall-Verbindung kann aber nicht ausgeschlossen werden, dass es über einen Spalt zwischen dem Außenrohr 1 und der Auskleidung 6 zu einer Leckage und damit zu einem Druckabfall zwischen Saugseite und Druckseite der Pumpe kommt. Dies kann erfindungsgemäß 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 entirely without a firmly adhering connection between outer tube 1 and lining 6, although a mechanical, positive connection between the lining 6 and the inner tube 2 is formed, in contrast to stators with a chemical rubber-metal compound but can It can not be ruled out that leakage will occur through a gap between the outer tube 1 and the lining 6, resulting in a pressure drop between the suction side and the pressure side of the pump. This can be prevented according to the invention by a clamping seal at the front ends of the lining 2. Two embodiments of such a clamping gasket will be described below with reference to the Fig. 3 and 4 be explained.

Bei der Ausführungsform gemäß Fig. 3 ist an der Stirnseite der Auskleidung 6 ein konischer Dichtring 10 vorgesehen, der einen zylindrischen Abschnitt 11, einen konischen Abschnitt 12 und einen Dichtwulst 13 aufweist. Der konische Abschnitt 12 ist von der Innenseite des Außenrohres 1 beabstandet und so ausgebildet, dass sein Abstand von Außenrohr 1 zum Inneren des Stators hin zunimmt. Der Dichtring 10 ist über eine Schweißnaht 14 mit dem Außenrohr 1 verbunden. Der Dichtring 10 kann anstatt durch eine Schweißverbindung auch durch eine Presspassung mit dem Außenrohr 1 verbunden sein.In the embodiment according to Fig. 3 is on the front side of the liner 6, a conical sealing ring 10 is provided, which has a cylindrical portion 11, a conical portion 12 and a sealing bead 13. The conical portion 12 is spaced from the inside of the outer tube 1 and formed so that its distance from the outer tube 1 increases toward the interior of the stator. The sealing ring 10 is connected via a weld 14 to the outer tube 1. The sealing ring 10 may be connected by a press fit with the outer tube 1 instead of a welded joint.

Weiterhin ist an dem Dichtring 10 ein Klemmring 15 angeordnet, der einen zylindrischen Abschnitt 16, einen konischen Abschnitt 17 und einen Anschlag 18 aufweist.Furthermore, a clamping ring 15 is arranged on the sealing ring 10, which has a cylindrical portion 16, a conical portion 17 and a stop 18.

Bei der Herstellung des Stators wird der Dichtring 10 in das Außenrohr 1 eingebracht, positioniert und ggf. dort befestigt, bevor der Werkstoff (Gummi) der Auskleidung 6 in das Außenrohr 1 eingebracht wird. Nach dem Einbringen des Gummis ist ein konischer Ringspalt 19 zwischen dem konischen Abschnitt 12 des Dichtrings 10 und dem Außenrohr 1 mit Gummi ausgefüllt. Erfahrungsgemäß schrumpft der Gummi beim Erkalten jedoch sowohl vom Außenrohr 1 als auch vom Dichtring 10 weg. Um die dabei entstehenden Spalte zu verschließen und den Gummi im Ringspalt 19 zwischen dem konischen Abschnitt 14 des Dichtringes 10 und dem Außenrohr 1 dichtend zu verpressen, wird der Klemmring 15 axial eingepresst. Die Wandstärke des Klemmrings 15 ist im konischen Abschnitt 17 größer als die Wandstärke des konischen Abschnitts 12 des Dichtrings 10. Dadurch ist gewährleistet, dass der konische Abschnitt 17 des Klemmrings 15 den konischen Abschnitt 12 des Dichtrings 10 nach außen drückt. Der Dichtwulst 13 des Dichtringes 10 verhindert ein Herausrutschen des Gummis aus dem Ringspalt 19 unter Einsatzbedingungen.In the manufacture of the stator, the sealing ring 10 is introduced into the outer tube 1, positioned and possibly fixed there before the material (rubber) of the lining 6 is introduced into the outer tube 1. After the introduction of the rubber is a conical annular gap 19 between the conical Section 12 of the sealing ring 10 and the outer tube 1 filled with rubber. Experience has shown that the rubber shrinks on cooling, however, both the outer tube 1 and the sealing ring 10 away. In order to close the resulting gap and to press the rubber sealingly in the annular gap 19 between the conical portion 14 of the sealing ring 10 and the outer tube 1, the clamping ring 15 is pressed axially. The wall thickness of the clamping ring 15 is greater in the conical portion 17 than the wall thickness of the conical portion 12 of the sealing ring 10. This ensures that the conical portion 17 of the clamping ring 15 presses the conical portion 12 of the sealing ring 10 to the outside. The sealing bead 13 of the sealing ring 10 prevents slipping out of the rubber from the annular gap 19 under conditions of use.

Bei der Ausführungsform gemäß Fig. 4 ist an der Stirnseite der Auskleidung ein einfacher Dichtring 20 vorgesehen. Dieser Dichtring 20 ist für den Einbau nach dem Einbringen der Auskleidung 6 in das Außenrohr 1 geeignet.In the embodiment according to Fig. 4 is on the front side of the liner a simple sealing ring 20 is provided. This sealing ring 20 is suitable for installation after the introduction of the lining 6 in the outer tube 1.

Bei der Herstellung des Stators gemäß Fig. 4 wird zuerst die Auskleidung 6 aus Gummi oder einem ähnlichen Material über den Einspritzprozess mit den Rohren 1 und 2 verbunden. Dabei wird der Endbereich 21 der Auskleidung 6 z. B. wie bei 22 gestrichelt dargestellt geformt. Um eine spaltfreie, druckfeste Abdichtung zwischen Außenrohr 1 und Auskleidung 6 zu erzielen, wird nach dem Vulkanisieren der Auskleidung 6 der Dichtring 20, der teilweise konisch ausgebildet ist, in das Außenrohr 1 eingeschoben. Dabei wird der Endbereich 21 der Auskleidung 6 durch den konischen Bereich 24 des Dichtringes 20 komprimiert und fest gegen das Außenrohr 1 gedrückt.In the manufacture of the stator according to Fig. 4 First, the liner 6 made of rubber or similar material is connected to the pipes 1 and 2 via the injection process. In this case, the end portion 21 of the lining 6 z. B. shaped as shown at 22 in dashed lines. In order to achieve a gap-free, pressure-tight seal between the outer tube 1 and lining 6, after the vulcanization of the lining 6, the sealing ring 20, which is partially conical, is inserted into the outer tube 1. In this case, the end region 21 of the lining 6 is compressed by the conical region 24 of the sealing ring 20 and pressed firmly against the outer tube 1.

Der Dichtring 20 kann, wie bei 23 dargestellt, durch eine Schweißnaht mit dem Außenrohr 1 verbunden und so gegen axiales Verschieben gesichert sein. Nach einer anderen Ausführungsform der Erfindung kann der Dichtring 20 auch durch eine Presspassung zwischen Dichtring 20 und Außenrohr 1 gegen Verschieben gesichert sein.The sealing ring 20 may, as shown at 23, connected by a weld with the outer tube 1 and secured against axial displacement. According to another embodiment of the invention, the Seal 20 also be secured against displacement by a press fit between the sealing ring 20 and the outer tube 1.

In Fig. 3 und 4 sind Möglichkeiten zur Abdichtung aufgezeigt. Es versteht sich, dass diese Abdichtungen sowohl in solchen Statoren angewendet werden können, welche z. B. kein gewendeltes, sondern ein zylindrisches Außenrohr aufweisen, als auch für gewendelte Statoren gemäß den Fig. 1 und 2 geeignet sind.In Fig. 3 and 4 possibilities for sealing are shown. It is understood that these seals can be applied both in such stators, which z. B. have no coiled, but a cylindrical outer tube, as well as for coiled stators according to the Fig. 1 and 2 are suitable.

Nach einer hier nicht dargestellten Ausführungsform der Erfindung kann das Außenrohr 1 ebenfalls Durchbrechungen aufweisen. Es ist nicht zwingend, dass das Außenrohr 1 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 1 has a closed surface.

Claims (5)

  1. Stator for an eccentric screw pump or an eccentric screw motor having a stator which has an outer tube (1) with a lining (6) made of rubber or a rubber-like material and a hollow space (7), shaped in the manner of a two- or multi-start coarse-pitch thread, for accommodating a rigid rotor, likewise shaped in the manner of a coarse-pitch thread, the coarse-pitch thread of the stator having in each case one start more than the coarse-pitch thread of the rotor, characterised in that a sealing ring (10, 20) is arranged at the end face of the lining (6) and seals the transition from the lining (6) to the outer tube (1), and the sealing ring (10, 20) having a conical region (17, 24) which is spaced from the inner side of the outer tube (1) and which opens towards the interior of the stator and towards the lining (6).
  2. Stator according to Claim 1, characterised in that the sealing ring (10, 20) is connected to the outer tube (1) by welding.
  3. Stator according to Claim 1, characterised by a press fit between sealing ring (10, 20) and outer tube (1).
  4. Stator according to Claim 1, characterised in that the sealing ring (10) has a sealing bead (13) at its end facing the lining (6).
  5. Stator according to Claim 1, characterised in that a clamping ring (15) is arranged on the sealing ring (10) and presses the sealing ring (10) against the lining (6).
EP08018529.1A 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor in accordance with the Moineau principle Expired - Fee Related EP2028372B1 (en)

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
EP04803164A EP1738078B1 (en) 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor according to the moineau principle

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP04803164A Division EP1738078B1 (en) 2003-11-17 2004-11-17 Stator for an eccentric screw pump or an eccentric screw motor according to the moineau principle

Publications (3)

Publication Number Publication Date
EP2028372A2 EP2028372A2 (en) 2009-02-25
EP2028372A3 EP2028372A3 (en) 2014-08-27
EP2028372B1 true EP2028372B1 (en) 2015-07-29

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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

Family Applications Before (1)

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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

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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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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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Also Published As

Publication number Publication date
CA2712364A1 (en) 2005-05-17
CA2712364C (en) 2013-08-27
EP1738078B1 (en) 2009-05-20
EP2028372A2 (en) 2009-02-25
CA2473001A1 (en) 2005-05-17
US7329106B2 (en) 2008-02-12
WO2005047702A2 (en) 2005-05-26
WO2005047702A3 (en) 2005-11-24
US20070053783A1 (en) 2007-03-08
US20050106052A1 (en) 2005-05-19
EP1738078A2 (en) 2007-01-03
EP2028372A3 (en) 2014-08-27
BRPI0416662B1 (en) 2017-02-07
BRPI0416662A (en) 2007-01-16
US7131827B2 (en) 2006-11-07
DE502004009512D1 (en) 2009-07-02
CA2473001C (en) 2011-04-19

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