EP2018478B1 - Stator casing for eccentric worm pumps - Google Patents

Stator casing for eccentric worm pumps Download PDF

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Publication number
EP2018478B1
EP2018478B1 EP07722396A EP07722396A EP2018478B1 EP 2018478 B1 EP2018478 B1 EP 2018478B1 EP 07722396 A EP07722396 A EP 07722396A EP 07722396 A EP07722396 A EP 07722396A EP 2018478 B1 EP2018478 B1 EP 2018478B1
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EP
European Patent Office
Prior art keywords
stator casing
stator
casing according
lining
grooves
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.)
Not-in-force
Application number
EP07722396A
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German (de)
French (fr)
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EP2018478A1 (en
Inventor
Mikael Tekneyan
Helmuth Weber
Johann Kreidl
Hisham Kamal
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Netzsch Pumpen and Systeme GmbH
Original Assignee
Netzsch Pumpen and Systeme GmbH
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Publication date
Application filed by Netzsch Pumpen and Systeme GmbH filed Critical Netzsch Pumpen and Systeme GmbH
Priority to SI200730945T priority Critical patent/SI2018478T1/en
Priority to PL07722396T priority patent/PL2018478T3/en
Publication of EP2018478A1 publication Critical patent/EP2018478A1/en
Application granted granted Critical
Publication of EP2018478B1 publication Critical patent/EP2018478B1/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
    • 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
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/20—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with dissimilar tooth forms
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/70—Disassembly methods

Definitions

  • the invention relates to a stator of an eccentric screw pump which consists of a stator casing and an elastic lining which is arranged movably in the stator casing.
  • stator emerges whose stator jacket and lining are helically shaped. Both parts are screwed together, which should prevent twisting during pump operation. It is also apparent from this document that stator combinations in which the stator jacket has on its inside projecting strips which engage in grooves on the surface of the lining, prevent twisting of both components.
  • FIG. 4 of the DE 1553126 A1 shows a polygonal lining, which is surrounded by a likewise polygonal shaped stator jacket.
  • the lining is not vulcanized in this example, you need for their removal from the pump casing, however, a puller.
  • the basically round inner surface of the stator jacket has a plurality of groove-shaped recesses into which the elastic material of the lining is vulcanized. An axial mobility of the lining is thus not given.
  • the object of the invention is therefore to make the stator jacket so that the adhesion of the lining is counteracted.
  • stator lining Depending on the pressure conditions, products and materials used in an eccentric screw pump, stresses on the lining are created. Naturally, these loads may sooner or later lead to the replacement or correction of the lining.
  • the axial mobility of the stator lining in the stator jacket may be necessary for optimum adjustment of the stator dimensions.
  • a replacement of the lining or a position compensation is difficult, since the stator lining applies very strongly to the inner surface of the stator shell.
  • the resulting or induced attraction and suction forces require high opposing forces to remove the liner from the stator jacket and to keep it movable relative to him.
  • the required counterforces are virtually eliminated by reducing the adhesive forces, for which purpose grooves are made in the surface of the inside of the stator jacket.
  • the stator lining retains its axial mobility even during pump operation.
  • the grooves on the inner surface of the stator shell are parallel to its longitudinal axis. With this or with the spiral arrangement of the grooves, the adhesive effect is canceled evenly.
  • the cross section of the grooves is adapted to differently elastic material for the stator lining.
  • the removal process can be done better with the use of highly elastic material and grooves with V-shape better than with angular or dovetail-shaped grooves.
  • This groove shape is again better suited for low-elastic material, since the penetration depth can be kept small here.
  • depth and width ratios in the range of 1: 1 to 2: 1 are very well suited to prevent the stator during the pump operation from twisting and on the other hand to support the separation process positive. If the lining does not detach itself from the stator jacket, only the bare stator could be inserted between a closure plate and a pressure medium reservoir. The subsequent introduction of the pressure medium (gas, liquid) into the grooves would initiate and accelerate the detachment process.
  • Another embodiment of the invention relates to the polygonal cross-sectional shape of the stator jacket and the liner.
  • the polygonal design of the stator jacket serves as an optimal fixation of the stator lining. From an edge number of 8 edges up a uniform load distribution takes place.
  • stator lining differently in the sections affect the stator lining differently in the sections.
  • it may be advantageous according to another embodiment of the invention if at least every other polygon surface has grooves or if at least one groove is introduced into the polygon surfaces.
  • the different pressure ranges of the stator can be designed.
  • the number of grooves increases or their width or depth are increased.
  • the stator jacket can have a continuous slot over the entire length, which has a slight widening possible.
  • the slot is covered and reduced during operation of the pump by a sealing strip.
  • the stator shell is in the operating state under a bias that dissolves when removing the sealing strip and thus widens the diameter of the stator shell.
  • the length dimension of the lining after the production is greater than in the installed state of the lining in the ready-to-use eccentric screw pump.
  • the closure strip has a conduit system with which a fluid between the stator shell and the liner can be pressed.
  • FIG. 1 shows a stator shell 10 with a usual as in the prior art known smooth cylindrical surface.
  • the inner surface of the stator shell is polygonal. Twelve surfaces 12, which are flat both in their length and in their width, are arranged next to one another around the inner circumference of the stator jacket. Two surfaces are always bounded by an intermediate edge 14 or are connected by an edge 14 with each other.
  • each surface 12 has three grooves 16. The grooves run parallel to one another along the longitudinal axis of the stator shell 10. The spacing of the grooves 16 relative to each other is the same on each and every surface 12, 12 ', 12 ", 12'" and so on.
  • a longitudinal slot 36 whose width depends inter alia on the diameter and the elasticity of the lining 18, divides the stator jacket on one side.
  • a closure strip 20 engages with these two ends 22, 24 a positive connection and thus ensures that the stator jacket does not expand during pump operation.
  • the strip may also be provided with a groove. So that the planar course of the inner surfaces 12, 12 ', 12 "is maintained, the ends 22, 24 are curved outwardly, whereby the closure strip in the outer region forms a positive connection and integrated into the surface course inside.
  • Fig. 2 is a basically the same construction of the stator shell as in Fig.1 seen. Because of his in kind compared to Fig.1 smaller diameter here form only 10 polygonal arranged surfaces 12, the inner surface of the stator shell. Corresponding to the smaller flow rates and delivery heights required for smaller pumps counterpressure a double groove arrangement per polygonal surface is provided for this size. Due to the reduction of the material thickness in the area of the edges, this area is reinforced with ribs 26. The rib width corresponds to the spacing of the grooves 16. Both the ribs 26 and the platform 28 are provided as centering and as Vercardschutz.
  • the Fig.2 shows the stator jacket without closure strip with the longitudinal slot 36 open.
  • the stator shell 10 after Fig. 3 is polygonal on its inside and outside.
  • the inner surfaces 12 and outer surfaces 30 are arranged congruently. All inner surfaces 12 each have three grooves 16 at equal distances from each other. If you choose the strength of the sealing strip less than that of the stator jacket so the closure strip simultaneously fulfills the function of a backup against overpressure.
  • a liner 18 of the stator shell 10 shows Fig. 4 , Through the interior of the lining, a cavity 32 extends with a multi-thread in which the rotor of the pump rotates.
  • the outer surface of the lining is polygonal shaped and has for this purpose a plurality of mutually parallel outer surfaces 34.
  • the length of the liner in the disassembled state is always greater than that of the stator jacket.
  • the stator lining is axially compressed during installation in the stator shell or in the eccentric screw and receives the required nominal dimensions for the pump cavity.
  • the outer diameter of the stator lining has undersized in the removed state.

Abstract

The invention relates to a stator casing for eccentric worm pumps comprising an elastic lining, the cylindrical stator casing having a surface on the inner side, along the longitudinal axis whereof grooves are incorporated.

Description

Die Erfindung betrifft einen Stator einer Exzenterschneckenpumpe der aus einem Statormantel und einer elastischen beweglich im Statormantel angeordneten Auskleidung besteht.The invention relates to a stator of an eccentric screw pump which consists of a stator casing and an elastic lining which is arranged movably in the stator casing.

Aus der DE 198 21 065 A1 geht hierzu ein Stator hervor, dessen Statormantel und Auskleidung schraubenförmig gestaltet sind. Beide Teile werden miteinander verschraubt, wodurch ein Verdrehen während des Pumpenbetriebes vermieden werden soll. Ebenso geht aus dieser Schrift hervor, daß Statorkombinationen, bei welchen der Statormantel an seiner Innenseite vorspringende Leisten aufweist, die in Nuten an der Oberfläche der Auskleidung eingreifen, ein Verdrehen beider Bauteile verhindern.From the DE 198 21 065 A1 For this purpose, a stator emerges whose stator jacket and lining are helically shaped. Both parts are screwed together, which should prevent twisting during pump operation. It is also apparent from this document that stator combinations in which the stator jacket has on its inside projecting strips which engage in grooves on the surface of the lining, prevent twisting of both components.

Die Figur 4 der DE 1553126 A1 zeigt eine polygonförmige Auskleidung, die von einem ebenfalls polygonförmig gestalteten Statormantel umgeben ist. Die Auskleidung ist in diesem Beispiel zwar nicht einvulkanisiert, man benötigt für deren Entnahme aus dem Pumpenmantel jedoch eine Abziehvorrichtung.The FIG. 4 of the DE 1553126 A1 shows a polygonal lining, which is surrounded by a likewise polygonal shaped stator jacket. Although the lining is not vulcanized in this example, you need for their removal from the pump casing, however, a puller.

Der DE 29 07 392 A1 ist eine Gestaltung zur Verbesserung der Haftwirkung der Auskleidung mit dem Statormantel zu entnehmen. Hierzu weist die im Grunde genommen runde innere Oberfläche des Statormantels mehrere nutenförmige Vertiefungen auf, in die das elastische Material der Auskleidung einvulkanisiert wird. Eine axiale Beweglichkeit der Auskleidung ist damit nicht gegeben.Of the DE 29 07 392 A1 is a design to improve the adhesion of the liner with the stator jacket refer. For this purpose, the basically round inner surface of the stator jacket has a plurality of groove-shaped recesses into which the elastic material of the lining is vulcanized. An axial mobility of the lining is thus not given.

Bei diesen Ausführungsbeispielen bleibt jedoch unberücksichtigt, daß der in der Pumpe beim Pumpen erzeugte Druck die Auskleidung sehr fest an den Statormantel anpreßt, die anschließend und während des Betriebes der Pumpe nur noch unter hohem Kraftaufwand und zumeist nicht ohne mechanische Hilfsmittel bewegt, entfernt oder ausgetauscht werden kann.In these embodiments, however, it is disregarded that the pressure generated in the pump when pumping presses the lining very firmly against the stator jacket, which subsequently and during operation of the pump only with great effort and usually not moved without mechanical aids are removed or replaced can.

Aufgabe der Erfindung ist es demnach, den Statormantel so zu gestalten, daß dem Anhaften der Auskleidung entgegengewirkt wird.The object of the invention is therefore to make the stator jacket so that the adhesion of the lining is counteracted.

Gelöst wird diese Aufgabe mit den Merkmalen des Anspruchs 1. Weitere Ausgestaltungen der Erfindung gehen aus den Merkmalen der Unteransprüche hervor.This object is achieved with the features of claim 1. Further embodiments of the invention will become apparent from the features of the dependent claims.

Je nachdem mit welchen Druckverhältnissen, Produkten und Materialien bei einer Exzenterschneckenpumpe gearbeitet wird, entstehen Belastungen auf die Auskleidung. Diese Belastungen können naturgemäß früher oder später zum Austausch oder einer Korrektur der Lage der Auskleidung führen. Außerdem kann die axiale Beweglichkeit der Statorauskleidung im Statormantel für die optimale Einstellung der Statormaße notwendig sein. Mit dem Aufbau der herkömmlichen Statorkombinationen ist ein Austausch der Auskleidung bzw. ein Lageausgleich nur schwer möglich, da sich die Statorauskleidung sehr stark an die Innenfläche des Statormantels anlegt. Selbst bei bindemittelfreiem Anliegen der Auskleidung am Statormantel erfordern die entstehenden oder verursachten Anziehungs- und Ansaugkräfte hohe Gegenkräfte um die Auskleidung vom Statormantel zu entfernen bzw. gegenüber ihm beweglich zu halten. Erfindungsgemäß werden die erforderlichen Gegenkräfte durch die Reduzierung der Haftkräfte nahezu eliminiert, wozu Rillen in die Oberfläche der Innenseite des Statormantels eingebracht sind. Damit behält die Statorauskleidung auch während des Pumpenbetriebes ihre axiale Beweglichkeit.Depending on the pressure conditions, products and materials used in an eccentric screw pump, stresses on the lining are created. Naturally, these loads may sooner or later lead to the replacement or correction of the lining. In addition, the axial mobility of the stator lining in the stator jacket may be necessary for optimum adjustment of the stator dimensions. With the construction of the conventional stator combinations, a replacement of the lining or a position compensation is difficult, since the stator lining applies very strongly to the inner surface of the stator shell. Even with binder-free coating of the liner on the stator jacket, the resulting or induced attraction and suction forces require high opposing forces to remove the liner from the stator jacket and to keep it movable relative to him. According to the invention, the required counterforces are virtually eliminated by reducing the adhesive forces, for which purpose grooves are made in the surface of the inside of the stator jacket. Thus, the stator lining retains its axial mobility even during pump operation.

In einer bevorzugten Ausführung verlaufen die Rillen auf der inneren Oberfläche des Statormantels parallel zu dessen Längsachse. Damit oder mit der spiralförmigen Anordnung der Rillen wird die Haftwirkung gleichmäßig aufgehoben.In a preferred embodiment, the grooves on the inner surface of the stator shell are parallel to its longitudinal axis. With this or with the spiral arrangement of the grooves, the adhesive effect is canceled evenly.

Gemäß einer weiteren Ausführungsform ist der Querschnitt der Rillen an unterschiedlich elastisches Material für die Statorauskleidung angepaßt. So kann der Ablösevorgang beim Einsatz von stark elastischem Material und Rillen mit V-Form besser vonstatten gehen als bei winkelförmigen oder schwalbenschwanzförmig gestalteten Rillen. Diese Rillenform ist wiederum für geringelastisches Material besser geeignet, da hier die Eindringtiefe klein gehalten werden kann.According to a further embodiment, the cross section of the grooves is adapted to differently elastic material for the stator lining. Thus, the removal process can be done better with the use of highly elastic material and grooves with V-shape better than with angular or dovetail-shaped grooves. This groove shape is again better suited for low-elastic material, since the penetration depth can be kept small here.

Es hat sich gezeigt, daß Tiefen- und Breitenverhältnisse im Bereich von 1:1 bis 2:1 sehr gut geeignet sind, den Statoreinsatz während des Pumpenbetriebes vor dem Verdrehen zu bewahren und andererseits den Trennvorgang positiv zu unterstützen. Sollte sich die Auskleidung einmal nicht vom Statormantel ablösen, so könnte nur der bloße Stator zwischen einer Abschlußplatte und einem Druckmittelspeicher eingesetzt werden. Das anschließende Einbringen des Druckmittels (Gas, Flüssigkeit) in die Rillen würden den Ablösevorgang einleiten und beschleunigen.It has been found that depth and width ratios in the range of 1: 1 to 2: 1 are very well suited to prevent the stator during the pump operation from twisting and on the other hand to support the separation process positive. If the lining does not detach itself from the stator jacket, only the bare stator could be inserted between a closure plate and a pressure medium reservoir. The subsequent introduction of the pressure medium (gas, liquid) into the grooves would initiate and accelerate the detachment process.

Ein weiteres Ausführungsbeispiel der Erfindung bezieht sich auf die polygone Querschnittsform des Statormantels und der Auskleidung. Je nachdem, welchen Förderquerschnitt die Exzenterschneckenpumpe benötigt und welche Reibung der Rotor im Stator erzeugt, muß ein Ausgleich zwischen der Kraft, die im Bereich der Rillen und dem Bereich der Kanten zwischen den polygonen Mantelflächen erzeugt wird, stattfinden, um einen unerwünschten Verschleiß der Auskleidung zu vermeiden. Die polygonförmige Gestaltung des Statormantels dient hier als optimale Fixierung der Statorauskleidung. Ab einer Kantenzahl von 8 Kanten aufwärts findet eine gleichmäßige Belastungsverteilung statt.Another embodiment of the invention relates to the polygonal cross-sectional shape of the stator jacket and the liner. Depending on which conveyor cross-section the eccentric screw pump requires and which friction the rotor generates in the stator, a balance must be made between the force generated in the area of the grooves and the area of the edges between the polygonal lateral surfaces to prevent undesirable wear of the lining avoid. The polygonal design of the stator jacket serves as an optimal fixation of the stator lining. From an edge number of 8 edges up a uniform load distribution takes place.

Je nach Fördermenge und Förderdruck sind spezielle Rillenmengen und Rillenformen möglich. Bei allen Rillenformen ist darauf zu achten, daß alle Radien der Rillen einen Radius von 0,2 mm nicht unterschreiten, damit die Ver- und Rückformung des Materials der Auskleidung nicht behindert wird.Depending on the flow rate and delivery pressure special groove amounts and groove shapes are possible. For all groove shapes, care should be taken to ensure that all radii of the grooves do not fall below a radius of 0.2 mm, so as not to obstruct the deformation and recovery of the material of the lining.

Spezielle Produkte, die unter bestimmten Temperaturen gepumpt werden, beeinflussen die Statorauskleidung in den Teilbereichen unterschiedlich. So kann es entsprechend einer weiteren erfindungsgemäßen Ausführung vorteilhaft sein, wenn mindestens jede zweite Polygonfläche Rillen aufweist oder wenn in die Polygonflächen mindestens eine Rille eingebracht ist. Unterschiedlich können auch die verschiedenen Druckbereiche des Statormantels gestaltet sein. So kann z.B. im Bereich höherer Förder- oder Gegendruckwerte die Anzahl von Rillen erhöht oder deren Breite oder Tiefe vergrößert werden.Special products, which are pumped under certain temperatures, affect the stator lining differently in the sections. Thus, it may be advantageous according to another embodiment of the invention, if at least every other polygon surface has grooves or if at least one groove is introduced into the polygon surfaces. Differently, the different pressure ranges of the stator can be designed. Thus, e.g. in the range of higher conveying or counter-pressure values, the number of grooves increases or their width or depth are increased.

Zur Vereinfachung der Montage und Demontage der Statorauskleidungen kann der Statormantel einen über die gesamte Länge durchgehenden Schlitz aufweisen, der eine geringfügige Weitung ermöglicht. Der Schlitz wird während des Betriebs der Pumpe durch eine Verschlußleiste abgedeckt und verkleinert. Somit steht der Statormantel im Betriebszustand unter einer Vorspannung, die sich beim Entfernen der Verschlußleiste löst und damit den Durchmesser des Statormantels weitet.To simplify the assembly and disassembly of the stator liners, the stator jacket can have a continuous slot over the entire length, which has a slight widening possible. The slot is covered and reduced during operation of the pump by a sealing strip. Thus, the stator shell is in the operating state under a bias that dissolves when removing the sealing strip and thus widens the diameter of the stator shell.

Nach einem weiteren Ausführungsbeispiel ist das Längenmaß der Auskleidung nach der Fertigung größer als im eingebauten Zustand der Auskleidung in der betriebsbereiten Exzenterschneckenpumpe.According to a further embodiment, the length dimension of the lining after the production is greater than in the installed state of the lining in the ready-to-use eccentric screw pump.

Gemäß einem weiteren Ausführungsbeispiel hat die Verschlußleiste ein Leitungssystem mit dem ein Fluid zwischen den Statormantel und die Auskleidung gepreßt werden kann.According to a further embodiment, the closure strip has a conduit system with which a fluid between the stator shell and the liner can be pressed.

Beispiele der Erfindung sind den nachfolgenden Zeichnungen zu entnehmen. Es zeigt:

Fig. 1
Statormantel für Exzenterschneckenpumpe
Fig. 2
dto.
Fig. 3
dto.
Fig. 4
Auskleidung für Statormantel
Examples of the invention can be taken from the following drawings. It shows:
Fig. 1
Statormantel for eccentric screw pump
Fig. 2
ditto.
Fig. 3
ditto.
Fig. 4
Lining for stator jacket

Die Figur 1 zeigt einen Statormantel 10 mit einer wie nach dem bisher bekannten Stand der Technik üblichen glatten zylindrischen Oberfläche. Die innere Oberfläche des Statormantels ist polygonförmig gestaltet. Zwölf sowohl in ihrer Länge als auch in ihrer Breite ebene Flächen 12 sind hier rings um den inneren Umfang des Statormantels aneinandergereiht. Zwei Flächen werden stets von einer dazwischenliegenden Kante 14 begrenzt bzw. sind durch eine Kante 14 miteinander verbunden. In diesem Ausführungsbeispiel weist jede Fläche 12 drei Rillen 16 auf. Die Rillen laufen parallel zueinander entlang der Längsachse des Statormantels 10. Der Abstand der Rillen 16 zueinander ist auf jeder und zu jeder Fläche 12, 12', 12", 12'" usw. gleich. Ein Längsschlitz 36, dessen Weite u.a. vom Durchmesser und der Elastizität der Auskleidung 18 abhängig ist, teilt den Statormantel an einer Seite.The FIG. 1 shows a stator shell 10 with a usual as in the prior art known smooth cylindrical surface. The inner surface of the stator shell is polygonal. Twelve surfaces 12, which are flat both in their length and in their width, are arranged next to one another around the inner circumference of the stator jacket. Two surfaces are always bounded by an intermediate edge 14 or are connected by an edge 14 with each other. In this embodiment, each surface 12 has three grooves 16. The grooves run parallel to one another along the longitudinal axis of the stator shell 10. The spacing of the grooves 16 relative to each other is the same on each and every surface 12, 12 ', 12 ", 12'" and so on. A longitudinal slot 36, whose width depends inter alia on the diameter and the elasticity of the lining 18, divides the stator jacket on one side.

Eine Verschlußleiste 20 geht mit diesen beiden Enden 22, 24 eine formschlüssige Verbindung ein und sichert damit, daß sich der Statormantel während des Pumpenbetriebs nicht aufweitet. Damit die erwünschten Antihafteigenschaften über den gesamten Innenumfang gleich bleiben, wofür die eingebrachten Rillen 16 sorgen, kann auch die Leiste mit einer Rille versehen sein. Damit der plane Verlauf der Innenflächen 12, 12', 12" beibehalten wird, sind die Enden 22, 24 nach außen gewölbt, wodurch die Verschlußleiste im Außenbereich einen Formschluß bildet und sich innen in den Flächenverlauf integriert.A closure strip 20 engages with these two ends 22, 24 a positive connection and thus ensures that the stator jacket does not expand during pump operation. In order that the desired non-stick properties remain the same over the entire inner circumference, what the incorporated grooves 16 provide, the strip may also be provided with a groove. So that the planar course of the inner surfaces 12, 12 ', 12 "is maintained, the ends 22, 24 are curved outwardly, whereby the closure strip in the outer region forms a positive connection and integrated into the surface course inside.

Aus Fig. 2 ist ein prinzipiell gleicher Aufbau des Statormantels wie in Fig.1 ersichtlich. Aufgrund seines in natura im Vergleich zu Fig.1 kleineren Durchmessers bilden hier nur 10 polygonal angeordnete Flächen 12 die innere Oberfläche des Statormantels. Entsprechend dem bei kleineren Pumpen benötigten kleineren Fördermengen und Förderhöhen abhängigen Gegendruck ist für diese Baugröße eine doppelte Rillenanordnung pro Polygonfläche vorgesehen. Aufgrund der Reduzierung der Materialstärke im Bereich der Kanten ist dieser Bereich mit Rippen 26 verstärkt. Die Rippenbreite entspricht dem Abstand der Rillen 16. Sowohl die Rippen 26 als auch die Plattform 28 sind als Zentrierhilfe und als Verdrehschutz vorgesehen. Die Fig.2 zeigt den Statormantel ohne Verschlußleiste mit geöffnetem Längsschlitz 36.Out Fig. 2 is a basically the same construction of the stator shell as in Fig.1 seen. Because of his in kind compared to Fig.1 smaller diameter here form only 10 polygonal arranged surfaces 12, the inner surface of the stator shell. Corresponding to the smaller flow rates and delivery heights required for smaller pumps counterpressure a double groove arrangement per polygonal surface is provided for this size. Due to the reduction of the material thickness in the area of the edges, this area is reinforced with ribs 26. The rib width corresponds to the spacing of the grooves 16. Both the ribs 26 and the platform 28 are provided as centering and as Verdrehschutz. The Fig.2 shows the stator jacket without closure strip with the longitudinal slot 36 open.

Der Statormantel 10 nach Fig. 3 ist auf seiner Innen- und Außenseite polygonförmig gestaltet. Die Innenflächen 12 und Außenflächen 30 sind deckungsgleich angeordnet. Alle Innenflächen 12 weisen jeweils drei Rillen 16 in gleichen Abständen voneinander auf. Wählt man die Festigkeit der Verschlußleiste geringer als die des Statormantels so erfüllt die Verschlußleiste gleichzeitig die Funktion einer Sicherung gegen Überdruck.The stator shell 10 after Fig. 3 is polygonal on its inside and outside. The inner surfaces 12 and outer surfaces 30 are arranged congruently. All inner surfaces 12 each have three grooves 16 at equal distances from each other. If you choose the strength of the sealing strip less than that of the stator jacket so the closure strip simultaneously fulfills the function of a backup against overpressure.

Eine Auskleidung 18 des Statormantels 10 zeigt Fig. 4. Durch das Innere der Auskleidung erstreckt sich ein Hohlraum 32 mit einem mehrgängigen Gewinde in dem der Rotor der Pumpe umläuft. Die äußere Oberfläche der Auskleidung ist polygonförmig gestaltet und hat hierzu mehrere parallel zueinander angeordnete Außenflächen 34. Die Länge der Auskleidung im ausgebauten Zustand ist stets größer als die des Statormantels. Dadurch wird die Statorauskleidung beim Einbau in den Statormantel bzw. in die Exzenterschneckenpumpe axial zusammengedrückt und erhält die erforderlichen Nennmaße für den Pumpenhohlraum. Der Außendurchmesser der Statorauskleidung hat demnach im ausgebauten Zustand Untermaß.A liner 18 of the stator shell 10 shows Fig. 4 , Through the interior of the lining, a cavity 32 extends with a multi-thread in which the rotor of the pump rotates. The outer surface of the lining is polygonal shaped and has for this purpose a plurality of mutually parallel outer surfaces 34. The length of the liner in the disassembled state is always greater than that of the stator jacket. As a result, the stator lining is axially compressed during installation in the stator shell or in the eccentric screw and receives the required nominal dimensions for the pump cavity. The outer diameter of the stator lining has undersized in the removed state.

BezugsziffernlisteReferences list

1010
Statormantelstator
1212
Innenflächepalm
1414
Kanteedge
1616
Rillengrooves
1818
Auskleidunglining
2020
Verschlußleisteclosure band
2222
Endenend up
2424
Endenend up
2626
Rippenribs
2828
Plattformplatform
3030
Außenflächeouter surface
3232
Hohlraumcavity
3434
Außenflächeouter surface
3636
Schlitzslot

Claims (15)

  1. A stator casing (10) for eccentric worm pumps, against the inner surface whereof, which is polygon-shaped, an elastic lining (18) lies in an axially mobile manner, characterised in that at least one groove (16) is introduced into the individual polygonal faces, said groove reducing the adhesive effect between the lining and the stator casing.
  2. The stator casing according to claim 1,
    characterised in that
    the grooves (16) are disposed parallel to the longitudinal axis.
  3. The stator casing according to claim 1,
    characterised in that
    the grooves (16) are formed rectangular, V-shaped, round or angular in cross-section.
  4. The stator casing according to claims 1 or 2,
    characterised in that
    the ratio of groove depth to groove width is 1 : 1.
  5. The stator casing according to claims 1 or 2,
    characterised in that
    the ratio of groove depth to groove width is > than 1, in particular 1.5 : 1.
  6. The stator casing according to claim 1,
    characterised in that
    at least every second polygonal face comprises grooves (16).
  7. The stator casing according to claim 1,
    characterised in that
    the stator casing (10) comprises a continuous slot (36).
  8. The stator casing according to claim 7,
    characterised in that
    the slot (36) is covered by a closure strip (20).
  9. The stator casing according to claim 8,
    characterised in that
    the closure strip (20) and the stator casing (10) form longitudinal grooves (16).
  10. The stator casing according to claim 1,
    characterised in that
    the stator casing (10) comprises a closure strip (20) extending along its longitudinal axis.
  11. The stator casing according to claim 1,
    characterised in that
    the inner surface of the stator casing comprises an anti-adhesion coating (e.g. PTFE lacquer).
  12. The stator casing according to claim 8,
    characterised in that
    the closure strip (20) is made from the same or different materials (plastic, aluminium, chromium nickel steel) as the stator casing.
  13. The stator casing according to claim 1,
    characterised in that
    the inner surface is roughened, for example by means of sandblasting.
  14. The stator casing according to claim 1,
    characterised in that
    the outer surface of the lining is provided with an anti-adhesion coating, e.g. PTFE lacquer.
  15. The stator casing according to claim 1,
    characterised in that
    the outer surface of the stator casing is provided with ribs (26) along the longitudinal axis.
EP07722396A 2006-05-11 2007-05-10 Stator casing for eccentric worm pumps Not-in-force EP2018478B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200730945T SI2018478T1 (en) 2006-05-11 2007-05-10 Stator casing for eccentric worm pumps
PL07722396T PL2018478T3 (en) 2006-05-11 2007-05-10 Stator casing for eccentric worm pumps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006021897A DE102006021897B4 (en) 2006-05-11 2006-05-11 Stator jacket for progressing cavity pumps
PCT/DE2007/000845 WO2007131476A1 (en) 2006-05-11 2007-05-10 Stator casing for eccentric worm pumps

Publications (2)

Publication Number Publication Date
EP2018478A1 EP2018478A1 (en) 2009-01-28
EP2018478B1 true EP2018478B1 (en) 2012-04-04

Family

ID=38445698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07722396A Not-in-force EP2018478B1 (en) 2006-05-11 2007-05-10 Stator casing for eccentric worm pumps

Country Status (21)

Country Link
US (1) US8033802B2 (en)
EP (1) EP2018478B1 (en)
JP (1) JP4886028B2 (en)
KR (1) KR101161915B1 (en)
CN (1) CN101443556B (en)
AT (1) ATE552422T1 (en)
AU (1) AU2007250390B2 (en)
BR (1) BRPI0712528B1 (en)
CA (1) CA2651133A1 (en)
DE (1) DE102006021897B4 (en)
DK (1) DK2018478T3 (en)
ES (1) ES2385258T3 (en)
MX (1) MX2008014335A (en)
MY (1) MY149088A (en)
NZ (1) NZ573585A (en)
PL (1) PL2018478T3 (en)
PT (1) PT2018478E (en)
RU (1) RU2398134C1 (en)
SI (1) SI2018478T1 (en)
WO (1) WO2007131476A1 (en)
ZA (1) ZA200809578B (en)

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WO2012024215A2 (en) 2010-08-16 2012-02-23 National Oilwell Varco, L.P. Reinforced stators and fabrication methods
RU2468306C2 (en) * 2010-11-03 2012-11-27 Валерий Никитич Гринавцев Turbulent heater
US8672656B2 (en) * 2010-12-20 2014-03-18 Robbins & Myers Energy Systems L.P. Progressing cavity pump/motor
JP5821058B2 (en) * 2010-12-27 2015-11-24 兵神装備株式会社 Uniaxial eccentric screw pump
US8905733B2 (en) * 2011-04-07 2014-12-09 Robbins & Myers Energy Systems L.P. Progressing cavity pump/motor
GB2499613B (en) * 2012-02-22 2017-11-01 Nat Oilwell Varco Lp Stator for progressive cavity pump/motor
DE102012112044B4 (en) * 2012-05-04 2015-10-08 Netzsch Pumpen & Systeme Gmbh Self-fixing stator housing
DE102012008761B4 (en) * 2012-05-05 2016-01-21 Netzsch Pumpen & Systeme Gmbh Divided stator jacket
DE202013004219U1 (en) 2013-05-06 2013-05-17 SGF SüDDEUTSCHE GELENKSCHEIBENFABRIK GMBH & CO. KG Stator for a feed pump
CN106685152B (en) * 2015-11-10 2019-03-12 耐驰（兰州）泵业有限公司 Manufacture for eccentrie helical totorpump can hydraulic adjustment stator method
DE102017126002B3 (en) 2017-11-07 2019-02-14 Seepex Gmbh Cavity Pump
CN108788642A (en) * 2018-06-21 2018-11-13 苏州利德精工制造有限公司 Vacuum pump stator processing method
WO2020051692A1 (en) 2018-09-11 2020-03-19 Rotoliptic Technologies Incorporated Sealing in helical trochoidal rotary machines
US11815094B2 (en) 2020-03-10 2023-11-14 Rotoliptic Technologies Incorporated Fixed-eccentricity helical trochoidal rotary machines
CA3115512C (en) * 2020-04-21 2023-08-22 Roper Pump Company Stator with modular interior
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CN114810579B (en) * 2022-04-24 2024-02-27 上海申贝泵业制造有限公司 Single screw pump

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Also Published As

Publication number Publication date
RU2008148604A (en) 2010-06-20
NZ573585A (en) 2011-03-31
JP2009536703A (en) 2009-10-15
ES2385258T3 (en) 2012-07-20
US8033802B2 (en) 2011-10-11
JP4886028B2 (en) 2012-02-29
WO2007131476A1 (en) 2007-11-22
CN101443556B (en) 2011-08-03
ATE552422T1 (en) 2012-04-15
AU2007250390B2 (en) 2012-05-24
MY149088A (en) 2013-07-15
EP2018478A1 (en) 2009-01-28
BRPI0712528B1 (en) 2019-06-25
US20090074599A1 (en) 2009-03-19
ZA200809578B (en) 2009-09-30
PL2018478T3 (en) 2012-09-28
PT2018478E (en) 2012-07-04
CN101443556A (en) 2009-05-27
DE102006021897A1 (en) 2007-11-15
KR101161915B1 (en) 2012-07-03
DK2018478T3 (en) 2012-07-16
DE102006021897B4 (en) 2009-11-19
MX2008014335A (en) 2008-11-27
CA2651133A1 (en) 2007-11-22
KR20090011022A (en) 2009-01-30
AU2007250390A1 (en) 2007-11-22
BRPI0712528A2 (en) 2012-09-04
SI2018478T1 (en) 2012-08-31
RU2398134C1 (en) 2010-08-27

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