EP2994640B1 - Stator for a feed pump - Google Patents

Stator for a feed pump Download PDF

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Publication number
EP2994640B1
EP2994640B1 EP14716317.4A EP14716317A EP2994640B1 EP 2994640 B1 EP2994640 B1 EP 2994640B1 EP 14716317 A EP14716317 A EP 14716317A EP 2994640 B1 EP2994640 B1 EP 2994640B1
Authority
EP
European Patent Office
Prior art keywords
stator
stator body
rotor
longitudinal axis
helical
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
EP14716317.4A
Other languages
German (de)
French (fr)
Other versions
EP2994640A1 (en
Inventor
Korbinian EISNER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SGF Sueddeutsche Gelenkscheibenfabrik GmbH and Co KG
Original Assignee
SGF Sueddeutsche Gelenkscheibenfabrik GmbH and Co KG
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Filing date
Publication date
Application filed by SGF Sueddeutsche Gelenkscheibenfabrik GmbH and Co KG filed Critical SGF Sueddeutsche Gelenkscheibenfabrik GmbH and Co KG
Publication of EP2994640A1 publication Critical patent/EP2994640A1/en
Application granted granted Critical
Publication of EP2994640B1 publication Critical patent/EP2994640B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01CROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00Rotary-piston machines or engines
    • F01C1/08Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F01C1/10Rotary-piston machines or engines 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
    • F01C1/101Moineau-type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10Rotary-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
    • F04C2/107Rotary-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
    • F04C2/1071Rotary-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
    • F04C2/1073Rotary-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
    • F04C2/1075Construction of the stationary member
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/10Rotary-piston pumps specially adapted for elastic fluids 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
    • F04C18/107Rotary-piston pumps specially adapted for elastic fluids 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
    • F04C18/1075Rotary-piston pumps specially adapted for elastic fluids 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 material, e.g. Moineau type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05CINDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00Other material characteristics; Treatment of material
    • F05C2253/04Composite, e.g. fibre-reinforced

Definitions

  • the present invention relates to a stator for a feed pump, in particular for a progressing cavity pump, wherein the stator has a stator body which has a receiving opening formed for receiving a rotor.
  • the stator disclosed in this document comprises a stator body made of a shell in the form of a smooth-cylindrical tube made of steel and a lining made of rubber or a rubber-like plastic.
  • the jacket of the stator body encloses the lining or the lining adheres firmly to an inner wall of the jacket of the stator body.
  • An inside of the lining defines an axially continuous cavity.
  • stator jacket with an elastic lining wherein the stator jacket has longitudinal grooves on the inside.
  • the ends of the stator jacket enter into a positive connection with a closure strip in order to secure the stator jacket against expansion during pumping operation.
  • stator for an eccentric screw pump whose stator body is formed from a hollow cylindrical shell made of metal and an elastomer core, which is connected by vulcanization cohesively with an inner circumferential surface of the hollow cylindrical shell.
  • the document discloses DE 198 42 754 A1 an eccentric screw, with an eccentric screw mounted in an eccentric screw rotor, the eccentric screw rotor is connected to a drive train, the eccentric screw stator is surrounded by a stator jacket, the stator shell and the eccentric screw stator are connected together at one end, the eccentric screw stator is cantilevered in the stator jacket with cylinder gap formation and the eccentric screw stator and stator casing consist of a flexurally elastic material, characterized in that the eccentric screw stator is surrounded by a stabilizing sleeve.
  • WO 99/19605 discloses a helical fluid handling device for use as a positive displacement pump, comprising: a) an elongate rotor, the rotor having at least one blade pointing radially outward and extending helically along the length of the rotor; and b) a rotor enclosing stator, the stator having an elastomeric shape having an inner surface, the inner surface having a number of grooves pointing radially inward and extending helically along the length of the stator the number of grooves by one more than the number of blades in the Rotor, the elastomeric form having a network of fibers encased in an elastomeric material.
  • Stators are also known from the prior art which have a helical stator body.
  • a stator is for example in the document DE 198 04 259 A1 disclosed.
  • the stator according to this document essentially consists of a rigid shell made of steel and a liner of rubber or a rubber-like plastic enclosed by the shell.
  • the liner is firmly adhered to the jacket, ie it rests against the inside of the jacket.
  • the liner has a continuous cavity for receiving a rotor.
  • the jacket has inside and outside on the contour and shape of the cavity and is therefore also coiled.
  • the jacket of the stator body with the required dimensions is first cut to length from a metal tube or a steel tube. Subsequently, the jacket of the stator body is chemically and / or mechanically coarse and then finely cleaned of dirt and roughened to increase the adhesion between the shell and the lining of rubber or a rubber-like plastic. Further, the sheath must be pretreated (chemically) at the joint with the rubber so that a compound can be made with the rubber.
  • a preheated, helical core is inserted to produce the helical or helical opening. Thereafter, the ends of the shell are closed with lids, and injected a rubber mixture. A connection between the shell and the rubber lining for the formation of the stator body takes place by vulcanization of the rubber lining.
  • stator for a feed pump of the type described in which the stator is formed as an at least partially reinforced with a thread insert elastomer body.
  • stator body in the form of an at least partially reinforced with a thread insert elastomer body can be completely dispensed with a metal tube or on a solid and non-detachable connection with a metal tube in the manufacture of the stator for a feed pump.
  • the costs necessary for obtaining and processing the metal tube and its pretreatment, as well as the time required in this connection can be saved in the production of the stator or the stator body, ie the production costs can be reduced to a considerable extent with the stator according to the invention ,
  • stator body according to the invention can be completely recycled, because there are no indissoluble connections with metal parts received as is common in the prior art.
  • stator according to the invention in use of a feed pump, such as e.g. an eccentric screw pump, higher torques can be absorbed by the stator body formed from a reinforced with a thread insert reinforced elastomer body, as is the case with the stators known from the prior art.
  • the helical rotor extending through the opening in the stator comes into contact with the elastomer core of the stator. Since the prior art rubber liner is vulcanized to the metal pipe, the joint between the rubber liner and the metal pipe is a weak point of the stators known in the art. With too high a torque applied to the rubber liner, in the prior art The technique of tearing the rubber lining at the junction with the metal tube from this.
  • stator according to the invention there is no connection between the rubber and a metal tube, since the stator is completely and exclusively formed by an elastomeric body, in which at least partially embedded a thread insert.
  • the stator body of the stator according to the invention can move in the radial and also axial direction, since there is no connection to a metal tube.
  • the stator body may be helical or helical.
  • the receiving opening in the stator body may extend helically therethrough along the longitudinal axis of the stator body.
  • two or more separate delivery chambers are formed by the interaction of the rotor with the stator or by the eccentric rotational movement of the rotor in the stator, which allow a continuous delivery of the conveyed.
  • the thread insert can preferably extend in the longitudinal direction through the stator body. As already mentioned, the thread insert can be embedded in the elastomer body or enclosed by the elastomer body.
  • the thread insert can extend according to an embodiment of the invention in the form of a winding about the longitudinal axis of the stator in the elastomer body.
  • the winding of the thread insert may preferably consist of several layers.
  • the individual layers of the winding can be wound crosswise.
  • a thread insert are generally different thread windings and fabric windings conceivable.
  • single-layer or multi-layer fabric layers, fabric tapes or the like can be used.
  • the production of the stator can be further simplified and accelerated because they can be quickly and easily wound on a first layer of elastomer during manufacture.
  • supporting elements can be provided on the stator body on its outer circumferential surface distributed over its longitudinal extent.
  • the support elements can be designed and arranged on the elastomer body in such a way that they prevent bulging or twisting and twisting of the elastomer body when using the stator with a delivery pump.
  • the stator may have at least one tie rod which is connected to the end pieces at the axial ends of the stator body.
  • the at least one tie rod is arranged to prevent rotation of the stator, so that the stator body is not rotated during operation of the pump by the rotation of the rotor or not rotated with the rotor.
  • tie rods are provided on stators or feed pumps, as in such pumps by the media to be conveyed, which can often be viscous, eccentric screw pumps, highly viscous or abrasive, during the conveying process, a relatively high pressure on the axial end surfaces of the stator or the Stator body is exercised so that the tie rods prevent deformation on the stator or on the stator subsequent components.
  • the support elements provided on the outer peripheral surface of the stator body can be supported on the at least one tie rod and thus prevent twisting and buckling or buckling of the stator body during operation of a delivery pump.
  • the support elements may be formed in the form of protrusions on the outer peripheral surface of the stator body and protrude in the direction of the tie rods.
  • the support elements attach themselves to the tie rods for support with a contact section formed on them.
  • the tie rods can cooperate with the support elements and their contact sections for preventing rotation of the stator body and hold the stator in such a predetermined position.
  • the support elements can therefore serve as anti-rotation. Due to the anti-rotation device achieved by the support elements, the prestressing force of the tie rods can be reduced or the pretensioning force can be reduced to the axial sealing force required in the application. Since the tie rods also have to produce no or only a smaller axial biasing force due to the thread insert of the stator body, the stator can be tuned to certain pumps and certain applications on the positioning and dimensioning of the tie rods and / or the support elements, which among other things, the performance of such Pumps can be increased.
  • the end pieces of the stator can preferably be designed such that the axial ends of the stator body formed in the form of an elastomer body reinforced with a thread insert are clamped by means of the end pieces.
  • the stator body has a mounting portion and a receiving portion comprising the receiving opening, wherein the mounting portion radially surrounds the receiving portion at least in sections.
  • This type of stator is preferably used in pumps or feed pumps, which have a rigidly mounted rotor.
  • the eccentric movement for generating the pumping chambers must be generated in such pumps via the stator, because the helical rotor is indeed rotatable, but not deflected in the radial direction to produce an eccentric movement.
  • the eccentric movement necessary for pumping operation is achieved in such a pump by the receiving portion of the stator body, which is deflected during operation by the rotating, helical rotor and can thus perform an eccentric movement.
  • the deflectable receiving portion two delivery chambers between the rotor and the receiving portion or between the corresponding helical contours are formed to promote the medium to be delivered through the stator.
  • the holding portion and the receiving portion may be connected to one another via an angled portion extending to the longitudinal axis.
  • the holding portion and the receiving portion may extend in the direction of the longitudinal axis.
  • a first end of the stator body can be clamped via end pieces of the stator.
  • the second end of the stator body may lie radially inwardly of the first end.
  • the two ends of the stator body can lie here, for example, in a plane extending substantially perpendicular to the longitudinal axis.
  • the receiving portion may be provided with a helical contour according to this embodiment.
  • the present invention further relates to a feed pump with a stator according to the type described above.
  • the present invention also relates to an eccentric screw pump having a stator as described above.
  • Fig. 1 shows a perspective view of a stator for a feed pump, which is generally designated 10.
  • the stator 10 has end pieces 12 and 14, which via tie rods 16 (in Fig. 1 three tie rods shown) are interconnected. Between the end pieces 12 and 14 extends the stator body 18, which is in the form of an at least partially with a thread insert (not shown) reinforced elastomer body 20 is formed.
  • the end pieces 12 and 14 are according to Fig. 1 formed in several parts, which will be discussed in more detail below.
  • an opening 22 can be seen, through which an end portion 24 of a rotor 26 extends.
  • the rotor 26 With the end portion 24, the rotor 26 with a drive means (not shown), which may for example consist of a motor and a propeller shaft, be connected.
  • the rotor 26 performs in operation with a feed pump perform an eccentric and rotational movement.
  • a propeller shaft for connecting a motor to the rotor 26 may, for example, have two kadan joints.
  • the connection between the motor and rotor 26 can be made via a flexible bending rod.
  • Fig. 1 can be seen further on the elastomer body 20 and stator 18 supporting elements 28 which are arranged distributed on the outer peripheral surface 30 of the stator 18 around and in the direction of the longitudinal axis L.
  • the rotor body 18 is helical or helical in shape, wherein the support elements 28 are provided on the outer periphery of the helical form or helical shape.
  • the support elements 28 are based on the tie rods 16 or lie against the tie rods 16 at.
  • the support elements 28 have for this purpose a concave contact portion 32. Due to the installation of the support elements 28 on the tie rods 16, a bulging or buckling of the stator body 18 due to the medium to be conveyed is produced during operation of a delivery pump provided with the stator 10 exerted pressure prevented. In other words, the pressure exerted by the medium to be conveyed on the elastomer body 20 of the stator body 18 is transmitted via the support elements 28 to the tie rods 16 with deformation of the support elements 28.
  • the end pieces 12 and 14 are formed in several parts and have tail portions 12a, 12b and 14a, 14b.
  • the tail parts 12a and 12b are as in FIG Fig. 1 is shown connected via fastening means in the form of screws 34. The same applies to the tail parts 14a, 14b, which in Fig. 1 is hinted at.
  • Fig. 2 shows a front view of the stator 10th
  • Fig. 2 the helix shape or helical shape of the stator body 18 can be seen, wherein distributed over the radius of the helical shape of the stator body 18 in the longitudinal direction, the support elements 28 are arranged.
  • the support elements 28 are each supported on the extending between the end pieces 12 and 14 tie rods 16.
  • Fig. 3 shows a side view of the stator 10th
  • Fig. 3 One recognizes the end piece 14 or the cup-shaped end piece part 14b and the opening 22 formed therein.
  • the rotor 26 is accommodated in a receiving opening 36 or in a recess 36 in the stator body 18.
  • the entrance of the aperture 36 in the stator body 18 and elastomeric body 20, respectively, extends longitudinally transversely of the longitudinal axis to assist in the eccentric movement of the rotor 26.
  • Fig. 4 shows a sectional view along the section line II-II Fig. 2 ,
  • Fig. 4 are the end piece 12 and the end piece part 12b, the screws 34, the end piece parts 12a and 12b ( Fig. 2 ) and the rotor 26 extending through the opening 36 is shown.
  • the support elements 28 attach themselves to the tie rods 16 via their abutment sections 32.
  • the opening 36 in the stator body 18, through which the rotor 26 extends, is due to the helical shape of the stator body 18 in the sectional view according to Fig. 4 again an elongated shape.
  • Fig. 5 shows a sectional view taken along the section line III-III Fig. 3 ,
  • the axial ends of the stator body 18 are respectively clamped by the tail portions 12a and 12b and 14a and 14b, respectively, to fix the stator body 18 to the end pieces 12 and 14 and to hold the stator body 18 together with the tie rods 16.
  • recesses 12 c and 14 c are provided in the end piece parts 12 b and 14 a, in which the axial ends of the stator body 18 are received. Via the screws 34, the axial ends of the stator body 18 are clamped between the respective end piece parts 12a, 12b and 14a, 14b.
  • the opening 36 or the recess 36 extends in the direction of the longitudinal axis L of the stator body 18 therethrough.
  • the recess 36 is also provided in its interior with a helical or helical contour. Through the recess 36 in turn extends, as in Fig. 5
  • the rotor 26 is likewise helical or helical.
  • the helix shape of the rotor 26 and the helix shape of the recess 36 in the elastomer body 20 of the stator body 18 cooperate to promote the medium to be conveyed, since by the helical shape of the stator body 18 and the rotor 26th Delivery chambers are formed, which allow a continuous and pulsation-free conveyance of the conveyed by the pump.
  • the rotor 26 can touch or deflect certain sections of the stator body 18 to form one or more delivery chamber (s) due to its spiral shape or its eccentric drive.
  • stator body 18 Since with such pumps often viscous, highly viscous and abrasive medium, such as oil, fats and sludge-like effluents are promoted, a relatively high pressure is exerted on the stator body 18 during operation of a feed pump or an eccentric pump. This pressure can be transmitted to the tie rods 16 with deformation of the support elements 28, whereby buckling or buckling and also rotation of the stator body 18 due to the pressure of the medium to be conveyed is prevented. The medium to be conveyed occurs at the end piece 14 (FIG. FIG.
  • the rotor 26 has an opening 40 for attachment to a propeller shaft or the like.
  • Fig. 6 shows a detailed view of the detail V from Fig. 5 .
  • stator body 18 In the manufacture of the stator body 18, unlike the prior art, no connection must be made between the elastomer and a metal pipe.
  • the thread insert 38 In the stator body 18 according to the invention, the thread insert 38 is embedded in an elastomer body 20 and the elastomer is then vulcanized, whereby a connection between the elastomer and the thread insert is produced.
  • the stator 110 has end pieces 112 and 114.
  • an opening 142 is formed, through which the medium to be conveyed enters the stator 110.
  • a receiving opening 122 is further formed, which receives the end portion 124 of the rotor 126 and in which the end portion 124 of the rotor 126 is mounted.
  • the rotor 126 is rotatably supported in the receiving opening 122, but can not perform any eccentric movement due to the rigid mounting in the opening 122.
  • the end portion 124 of the rotor 126 is tubular, whereas the portion of the rotor 126 received in the opening 136 of the stator body 118 and the elastomer body 120, respectively, is formed helically.
  • the stator body 118 comprises a holding portion 146 which radially surrounds the receiving portion 144.
  • the receiving portion 144 and the holding portion 146 are connected to each other via a connecting portion 148.
  • the connecting portion 148 extends at an angle to the longitudinal axis L, whereas the receiving portion 144 and the support portion 146 extend in the direction of the longitudinal axis L.
  • the connecting portion forms part of the receiving opening 136 of the elastomeric body 120.
  • a first end 150 of the elastomeric body 120 is clamped between the tail portions 112a and 112b of the end piece 112.
  • the second end 152 of the elastomeric body 120 is provided radially inward of the first end 150 and is not in communication with the tail portions 112a, 112b.
  • the second end 152 and the receiving portion 144 are movable.
  • the receiving portion 144 is forced in operation by the rotating rotor 126 an eccentric movement, which is necessary for the pumping operation.
  • the elastomeric body 120 includes the suture liner 138 that extends completely through the elastomeric body 120 and is also clamped in the tailpiece portions 112a and 112b.
  • the stator 110 includes a tubular portion 154 that extends between the end pieces 114 and 112.
  • the support portion 146 of the elastomeric body 120 abuts the tubular portion 154.
  • the connecting portion 148 of the elastomeric body 120 extends radially inward and merges into the receiving opening 136, or connects the support portion 146 with the helically shaped contoured receiving portion 144.
  • the receiving portion 144 at least receives the rotor 126 in sections.
  • the stator 110 is particularly designed for pumps in which the rotor 126 is rigidly arranged and performs only a rotational movement about the longitudinal axis L.
  • the rotor 126 can not perform an eccentric movement.
  • the eccentric movement necessary for pumping operation is achieved in such a pump by the receiving portion 144 of the stator body 118, which is deflected in operation by the rotating helical rotor 126 and so can perform an eccentric movement.
  • the eccentric movement of the deflectable receiving portion 144 is also possible due to the movable end 152 which is not attached to the stator 110 and the end piece 112, respectively.
  • two delivery chambers between the rotor 126 and the receiving portion 144 or between the corresponding helical contours are formed to promote the medium to be conveyed through the stator 110.
  • the eccentric motion necessary for the pumping operation is achieved in such pumps by the rotational movement of the rotor 126 and the deflection of the receiving portion 144 of the elastomer body 120 relative to the longitudinal axis L.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Description

Die vorliegende Erfindung betrifft einen Stator für eine Förderpumpe, insbesondere für eine Exzenterschneckenpumpe, wobei der Stator einen Statorkörper aufweist, der eine zur Aufnahme eines Rotors ausgebildete Aufnahmeöffnung aufweist.The present invention relates to a stator for a feed pump, in particular for a progressing cavity pump, wherein the stator has a stator body which has a receiving opening formed for receiving a rotor.

Derartige Pumpenstatoren sind aus dem Stand der Technik bekannt und beispielsweise in dem Dokument DE 10 2005 028 818 B3 beschrieben. Der in diesem Dokument offenbarte Stator weist einen Statorkörper aus einem Mantel in Form eines glattzylindrischen Rohres aus Stahl und einer Auskleidung aus Gummi oder einen gummiähnlichen Kunststoff auf. Der Mantel des Statorkörpers umschließt die Auskleidung bzw. die Auskleidung haftet fest an einer Innenwandung des Mantels des Statorkörpers. Eine Innenseite der Auskleidung definiert einen axial durchgehenden Hohlraum.Such pump stators are known from the prior art and, for example, in the document DE 10 2005 028 818 B3 described. The stator disclosed in this document comprises a stator body made of a shell in the form of a smooth-cylindrical tube made of steel and a lining made of rubber or a rubber-like plastic. The jacket of the stator body encloses the lining or the lining adheres firmly to an inner wall of the jacket of the stator body. An inside of the lining defines an axially continuous cavity.

Aus dem Dokument DE 10 2006 021 897 A1 ist ein Statormantel mit einer elastischen Auskleidung bekannt, wobei der Statormantel an der Innenseite Längsrillen aufweist. Die Enden des Statormantels gehen mit einer Verschlussleiste einen Formschluss ein, um den Statormantel gegen ein Aufweiten im Pumpbetrieb zu sichern.From the document DE 10 2006 021 897 A1 a stator jacket with an elastic lining is known, wherein the stator jacket has longitudinal grooves on the inside. The ends of the stator jacket enter into a positive connection with a closure strip in order to secure the stator jacket against expansion during pumping operation.

Ferner offenbart das Dokument DE 10 2010 000 923 A1 einen Stator für eine Exzenterschneckenpumpe, dessen Statorkörper aus einem hohlzylindrischen Mantel aus Metall und einem Elastomerkern gebildet wird, der durch Vulkanisieren stoffschlüssig mit einer Innenmantelfläche des hohlzylindrischen Mantels verbunden ist.Further, the document discloses DE 10 2010 000 923 A1 a stator for an eccentric screw pump whose stator body is formed from a hollow cylindrical shell made of metal and an elastomer core, which is connected by vulcanization cohesively with an inner circumferential surface of the hollow cylindrical shell.

Weiterhin offenbart das Dokument DE 198 42 754 A1 eine Exzenterschneckenpumpe, mit einem in einem Exzenterschneckenstator gelagerten Exzenterschneckenrotor, wobei der Exzenterschneckenrotor an einen Antriebsstrang angeschlossen ist, der Exzenterschneckenstator von einem Statormantel umgeben ist, der Statormantel und der Exzenterschneckenstator an einem Ende miteinander verbunden sind, der Exzenterschneckenstator in dem Statormantel unter Zylinderspaltbildung fliegend gelagert ist und der Exzenterschneckenstator und Statormantel aus einem biegeelastischen Material bestehen, dadurch gekennzeichnet, dass der Exzenterschneckenstator von einer Stabilisierungshülse umgeben ist.Furthermore, the document discloses DE 198 42 754 A1 an eccentric screw, with an eccentric screw mounted in an eccentric screw rotor, the eccentric screw rotor is connected to a drive train, the eccentric screw stator is surrounded by a stator jacket, the stator shell and the eccentric screw stator are connected together at one end, the eccentric screw stator is cantilevered in the stator jacket with cylinder gap formation and the eccentric screw stator and stator casing consist of a flexurally elastic material, characterized in that the eccentric screw stator is surrounded by a stabilizing sleeve.

Das Dokument WO 99/19605 offenbart eine schraubenartige Fluidhandhabungsvorrichtung für die Benutzung als Verdrängerpumpe, die aufweist: a) einen länglichen Rotor, wobei der Rotor mindestens eine Schaufel hat, die radial nach außen zeigt und sich schraubenartig entlang der Länge des Rotors erstreckt; und b) einen den Rotor umschließenden Stator, wobei der Stator eine Elastomer-Form aufweist, die eine innere Oberfläche hat, wobei die innere Oberfläche eine Anzahl Nuten, die radial nach innen zeigen und sich schraubenartig entlang der Länge des Stators erstrecken, aufweist, wobei die Anzahl der Nuten um eins mehr als die Anzahl der Schaufeln in dem Rotor ist, wobei die Elastomer-Form ein Netzwerk von Fasern, die mit einem elastomerischen Material ummantelt sind, aufweist.The document WO 99/19605 discloses a helical fluid handling device for use as a positive displacement pump, comprising: a) an elongate rotor, the rotor having at least one blade pointing radially outward and extending helically along the length of the rotor; and b) a rotor enclosing stator, the stator having an elastomeric shape having an inner surface, the inner surface having a number of grooves pointing radially inward and extending helically along the length of the stator the number of grooves by one more than the number of blades in the Rotor, the elastomeric form having a network of fibers encased in an elastomeric material.

Aus dem Stand der Technik sind auch Statoren bekannt, die einen wendelförmigen Statorkörper aufweisen. Ein derartiger Stator ist beispielsweise in dem Dokument DE 198 04 259 A1 offenbart. Der Stator gemäß diesem Dokument besteht im Wesentlichen aus einem starren, aus Stahl gefertigten Mantel und einer von dem Mantel umschlossenen Auskleidung aus Gummi oder einem gummiähnlichen Kunststoff. Die Auskleidung wird fest haftend mit dem Mantel verbunden, d. h., sie liegt an der Innenseite des Mantels an. Die Auskleidung hat einen durchgehenden Hohlraum zur Aufnahme eines Rotors. Der Mantel weist innen und außen die Kontur und Form des Hohlraumes auf und ist dementsprechend ebenfalls gewendelt.Stators are also known from the prior art which have a helical stator body. Such a stator is for example in the document DE 198 04 259 A1 disclosed. The stator according to this document essentially consists of a rigid shell made of steel and a liner of rubber or a rubber-like plastic enclosed by the shell. The liner is firmly adhered to the jacket, ie it rests against the inside of the jacket. The liner has a continuous cavity for receiving a rotor. The jacket has inside and outside on the contour and shape of the cavity and is therefore also coiled.

Die Herstellung der aus dem Stand der Technik bekannten Statoren folgt zumeist dem in DE 10 2010 000 923 A1 offenbarten Schema.The preparation of the known from the prior art stators usually follows the in DE 10 2010 000 923 A1 disclosed scheme.

Gemäß diesem Dokument wird bei der Herstellung der aus dem Stand der Technik bekannten Statoren zunächst von einem Metallrohr bzw. einem Stahlrohr der Mantel des Statorkörpers mit den benötigten Abmaßen abgelängt. Anschließend wird der Mantel des Statorkörpers chemisch und/oder mechanisch grob und danach fein von Verschmutzungen gereinigt sowie aufgeraut, um die Haftung zwischen dem Mantel und der Auskleidung aus Gummi oder einem gummiähnlichen Kunststoff zu erhöhen. Ferner muss der Mantel an der Verbindungsstelle mit dem Gummi derart (chemisch) vorbehandelt werden, dass eine Verbindung mit dem Gummi hergestellt werden kann. In den zur stoffschlüssigen Verbindung vorbereiteten Mantel wird zur Herstellung der helixförmigen bzw. schneckengangförmigen Öffnung ein vorgewärmter, schneckengangförmiger Kern eingelegt. Danach werden die Stirnseiten des Mantels mit Deckeln verschlossen, und eine Kautschukmischung eingespritzt. Eine Verbindung zwischen dem Mantel und dem Gummiauskleidung zur Bildung des Statorkörpers erfolgt durch eine Vulkanisation der Gummiauskleidung.According to this document, in the production of the stators known from the prior art, the jacket of the stator body with the required dimensions is first cut to length from a metal tube or a steel tube. Subsequently, the jacket of the stator body is chemically and / or mechanically coarse and then finely cleaned of dirt and roughened to increase the adhesion between the shell and the lining of rubber or a rubber-like plastic. Further, the sheath must be pretreated (chemically) at the joint with the rubber so that a compound can be made with the rubber. In the shell prepared for the cohesive connection, a preheated, helical core is inserted to produce the helical or helical opening. Thereafter, the ends of the shell are closed with lids, and injected a rubber mixture. A connection between the shell and the rubber lining for the formation of the stator body takes place by vulcanization of the rubber lining.

Eine derartige Herstellung eines Pumpenstators ist auch aufgrund der Bearbeitung bzw. Vorbehandlung des Metallrohrs sehr zeit- und kostenintensiv.Such a production of a pump stator is also very time consuming and costly due to the processing or pretreatment of the metal tube.

Es ist eine Aufgabe der vorliegenden Erfindung, einen Stator für eine Förderpumpe, insbesondere für eine Exzenterschneckenpumpe, bereitzustellen, der einfach und kostengünstig herstellbar ist.It is an object of the present invention to provide a stator for a feed pump, in particular for an eccentric screw pump, which is simple and inexpensive to produce.

Diese Aufgabe wird mit einem Stator für eine Förderpumpe der eingangs bezeichneten Art gelöst, bei dem der Statorkörper als ein zumindest abschnittsweise mit einer Fadeneinlage verstärkter Elastomerkörper ausgebildet ist.This object is achieved with a stator for a feed pump of the type described, in which the stator is formed as an at least partially reinforced with a thread insert elastomer body.

Durch den Statorkörper in Form eines zumindest abschnittsweise mit einer Fadeneinlage verstärkten Elastomerkörpers kann vollständig auf ein Metallrohr bzw. auf eine feste und unlösbare Verbindung mit einem Metallrohr bei der Herstellung des Stators für eine Förderpumpe verzichtet werden. Dadurch können bei der Herstellung des Stators bzw. des Statorkörpers insbesondere die zur Beschaffung und Bearbeitung des Metallrohrs sowie dessen Vorbehandlung notwendigen Kosten und auch der in diesem Zusammenhang anfallende Zeitaufwand eingespart werden, d.h. mit dem Stator gemäß der Erfindung können die Herstellungskosten in erheblichen Umfang reduziert werden.By the stator body in the form of an at least partially reinforced with a thread insert elastomer body can be completely dispensed with a metal tube or on a solid and non-detachable connection with a metal tube in the manufacture of the stator for a feed pump. As a result, the costs necessary for obtaining and processing the metal tube and its pretreatment, as well as the time required in this connection, can be saved in the production of the stator or the stator body, ie the production costs can be reduced to a considerable extent with the stator according to the invention ,

Ferner kann der Statorkörper gemäß der Erfindung vollständig recycelt werden, denn es werden keine unlösbaren Verbindungen mit Metallteilen eingegangen wie dies beim Stand der Technik üblich ist.Furthermore, the stator body according to the invention can be completely recycled, because there are no indissoluble connections with metal parts received as is common in the prior art.

Im Einsatz des erfindungsgemäßen Stators in einer Förderpumpe, wie z.B. einer Exzenterschneckenpumpe, können durch den aus einem mit einer Fadeneinlage verstärkten Elastomerkörper gebildeten Statorkörper höhere Drehmomente aufgenommen werden, als dies bei den aus dem Stand der Technik bekannten Statoren der Fall ist. Im Betrieb einer Förderpumpe und insbesondere im Betrieb einer Exzenterschneckenpumpe kommt der sich durch die Öffnung in dem Stator erstreckende, helixförmige Rotor mit dem Elastomerkern des Stators in Kontakt. Da die Gummiauskleidung gemäß dem Stand der Technik an das Rohr aus Metall anvulkanisiert ist, stellt die Verbindungsstelle zwischen der Gummiauskleidung und dem Metallrohr eine Schwachstelle der aus dem Stand der Technik bekannten Statoren dar. Bei einem zu hohen auf die Gummiauskleidung ausgeübten Drehmoment kann bei dem Stand der Technik die Gummiauskleidung an der Verbindungsstelle mit dem Metallrohr von diesem abreißen.In use of the stator according to the invention in a feed pump, such as e.g. an eccentric screw pump, higher torques can be absorbed by the stator body formed from a reinforced with a thread insert reinforced elastomer body, as is the case with the stators known from the prior art. During operation of a feed pump and in particular during operation of an eccentric screw pump, the helical rotor extending through the opening in the stator comes into contact with the elastomer core of the stator. Since the prior art rubber liner is vulcanized to the metal pipe, the joint between the rubber liner and the metal pipe is a weak point of the stators known in the art. With too high a torque applied to the rubber liner, in the prior art The technique of tearing the rubber lining at the junction with the metal tube from this.

Diese Schwachstelle wird mit dem erfindungsgemäßen Stator vollständig eliminiert. Bei dem erfindungsgemäßen Stator gibt es keine Verbindungsstelle zwischen dem Gummi und einem Metallrohr, da der Statorkörper vollständig und ausschließlich von einem Elastomerkörper gebildet wird, in den zumindest abschnittsweise eine Fadeneinlage eingebettet ist. Anders ausgedrückt, kann sich der Statorkörper des erfindungsgemäßen Stators in radialer und auch axialer Richtung bewegen, da keine Verbindung zu einem Metallrohr gegeben ist. Durch die gemäß der Erfindung erreichte Bewegungsfreiheit können die Standzeiten verlängert und Stillstandzeiten sowie der Verschleiß insgesamt reduziert werden.This weak point is completely eliminated with the stator according to the invention. In the stator according to the invention there is no connection between the rubber and a metal tube, since the stator is completely and exclusively formed by an elastomeric body, in which at least partially embedded a thread insert. In other words, the stator body of the stator according to the invention can move in the radial and also axial direction, since there is no connection to a metal tube. By the freedom of movement achieved according to the invention, the service life can be extended and downtime and wear can be reduced overall.

Gemäß einer Ausführungsform der Erfindung kann der Statorkörper wendelförmig bzw. helixförmig ausgebildet sein. Die Aufnahmeöffnung in dem Statorkörper kann sich wendelförmig entlang der Längsachse des Statorkörpers durch diesen hindurch erstrecken. Im Einsatz eines derartigen Stators mit einem Rotor werden durch das Zusammenspiel des Rotors mit dem Stator bzw. durch die exzentrische Rotationsbewegung des Rotors in dem Stator zwei oder mehrere getrennte Förderkammern ausgebildet, die eine kontinuierliche Förderung des Förderguts ermöglichen.According to one embodiment of the invention, the stator body may be helical or helical. The receiving opening in the stator body may extend helically therethrough along the longitudinal axis of the stator body. In the use of such a stator with a rotor two or more separate delivery chambers are formed by the interaction of the rotor with the stator or by the eccentric rotational movement of the rotor in the stator, which allow a continuous delivery of the conveyed.

Vorzugsweise kann sich die Fadeneinlage in Längsrichtung durch den Statorkörper erstrecken. Die Fadeneinlage kann, wie bereits erwähnt, in den Elastomerkörper eingebettet bzw. von dem Elastomerkörper umschlossen sein.The thread insert can preferably extend in the longitudinal direction through the stator body. As already mentioned, the thread insert can be embedded in the elastomer body or enclosed by the elastomer body.

Die Fadeneinlage kann sich gemäß einer Weiterbildung der Erfindung in Form einer Wicklung um die Längsachse des Stators in dem Elastomerkörper erstrecken. In diesem Zusammenhang kann die Wicklung der Fadeneinlage vorzugsweise aus mehreren Lagen bestehen. Die einzelnen Lagen der Wicklung können dabei über Kreuz gewickelt sein. Als Fadeneinlage sind allgemein verschiedene Fadenwicklungen und Gewebewicklungen denkbar. Beispielsweise können auch einlagige oder mehrlagige Gewebelagen, Gewebebänder oder dergleichen verwendet werden. Durch die Gewebebänder kann die Herstellung des Stators weiter vereinfacht und beschleunigt werden, da diese bei der Herstellung schnell und einfach auf eine erste Elastomerschicht gewickelt werden können.The thread insert can extend according to an embodiment of the invention in the form of a winding about the longitudinal axis of the stator in the elastomer body. In this context, the winding of the thread insert may preferably consist of several layers. The individual layers of the winding can be wound crosswise. As a thread insert are generally different thread windings and fabric windings conceivable. For example, single-layer or multi-layer fabric layers, fabric tapes or the like can be used. By the fabric tapes, the production of the stator can be further simplified and accelerated because they can be quickly and easily wound on a first layer of elastomer during manufacture.

Gemäß einer Ausführungsform der Erfindung können an dem Statorkörper an seiner Außenumfangsfläche verteilt über seine Längserstreckung Abstützelemente vorgesehen sein. Die Abstützelemente können dabei derart an dem Elastomerkörper ausgebildet und angeordnet sein, dass sie ein Ausbeulen bzw. Ausknicken und ein Verdrehen des Elastomerkörpers bei der Verwendung des Stators mit einer Förderpumpe verhindern.According to one embodiment of the invention, supporting elements can be provided on the stator body on its outer circumferential surface distributed over its longitudinal extent. The support elements can be designed and arranged on the elastomer body in such a way that they prevent bulging or twisting and twisting of the elastomer body when using the stator with a delivery pump.

Gemäß einer Weiterbildung der Erfindung kann der Stator wenigstens einen Zuganker aufweisen, der mit den Endstücken an den axialen Enden des Statorkörpers verbunden ist. Der wenigstens eine Zuganker wird zur Verdrehsicherung des Statorkörpers angeordnet, damit der Statorköper im Betrieb der Pumpe durch die Rotation des Rotors nicht verdreht bzw. nicht mit dem Rotor mit gedreht wird. Ferner werden Zuganker an Statoren bzw. Förderpumpen vorgesehen, da bei derartigen Pumpen durch die zu fördernden Medien, die gerade bei Exzenterschneckenpumpen häufig dickflüssig, hoch viskos oder abrasiv sein können, während des Fördervorgangs ein relativ hoher Druck auf die axialen Endflächen des Stators bzw. des Statorkörpers ausgeübt wird, so dass die Zuganker Deformationen an dem Stator bzw. an sich an den Stator anschließenden Komponenten verhindern.According to one embodiment of the invention, the stator may have at least one tie rod which is connected to the end pieces at the axial ends of the stator body. The at least one tie rod is arranged to prevent rotation of the stator, so that the stator body is not rotated during operation of the pump by the rotation of the rotor or not rotated with the rotor. Furthermore, tie rods are provided on stators or feed pumps, as in such pumps by the media to be conveyed, which can often be viscous, eccentric screw pumps, highly viscous or abrasive, during the conveying process, a relatively high pressure on the axial end surfaces of the stator or the Stator body is exercised so that the tie rods prevent deformation on the stator or on the stator subsequent components.

Gemäß einer Ausführungsform der Erfindung können sich die an der Außenumfangsfläche des Statorkörpers vorgesehenen Abstützelemente an dem wenigstens einen Zuganker abstützen und derart ein Verdrehen und auch ein Ausknicken bzw. ein Ausbeulen des Statorkörpers im Betrieb einer Förderpump verhindern. Die Abstützelemente können in Form von Vorsprüngen an der Außenumfangsfläche des Statorkörpers ausgebildet sein und in Richtung der Zuganker vorstehen. Die Abstützelemente legen sich zur Abstützung mit einem an ihnen ausgebildeten Anlageabschnitt an die Zuganker an. Die Zuganker können mit den Abstützelementen und deren Anlageabschnitten zur Verdrehsicherung des Statorkörpers zusammenwirken und den Statorkörper derart in seiner vorbestimmten Position halten.According to one embodiment of the invention, the support elements provided on the outer peripheral surface of the stator body can be supported on the at least one tie rod and thus prevent twisting and buckling or buckling of the stator body during operation of a delivery pump. The support elements may be formed in the form of protrusions on the outer peripheral surface of the stator body and protrude in the direction of the tie rods. The support elements attach themselves to the tie rods for support with a contact section formed on them. The tie rods can cooperate with the support elements and their contact sections for preventing rotation of the stator body and hold the stator in such a predetermined position.

Die Abstützelemente können demnach als Verdrehsicherung dienen. Aufgrund der durch die Abstützelemente erreichten Verdrehsicherung kann die Vorspannkraft der Zuganker reduziert bzw. die Vorspannkraft kann auf die im Anwendungsfall notwendige axiale Abdichtkraft reduziert werden. Da die Zuganker auch aufgrund der Fadeneinlage des Statorkörpers keine oder nur eine geringere axiale Vorspannkraft erzeugen müssen, kann über die Positionierung und Dimensionierung der Zuganker und/oder die Abstützelemente der Stator auf bestimmte Pumpen und bestimmte Anwendungsfälle abgestimmt werden, wodurch unter anderem auch die Leistung derartiger Pumpen erhöht werden kann.The support elements can therefore serve as anti-rotation. Due to the anti-rotation device achieved by the support elements, the prestressing force of the tie rods can be reduced or the pretensioning force can be reduced to the axial sealing force required in the application. Since the tie rods also have to produce no or only a smaller axial biasing force due to the thread insert of the stator body, the stator can be tuned to certain pumps and certain applications on the positioning and dimensioning of the tie rods and / or the support elements, which among other things, the performance of such Pumps can be increased.

Die Endstücke des Stators können vorzugsweise derart ausgebildet sein, dass die axialen Enden des in Form eines mit einer Fadeneinlage verstärkten Elastomerkörpers ausgebildeten Statorkörpers mittels der Endstücke klemmbar sind. Durch die Klemmung der axialen Enden des Statorkörpers mittels der Endstücke, die über die Zuganker miteinander verbunden sind, wird der Statorkörper in seiner vorbestimmten Form gehalten und der Stator kann derart über die Endstücke an der Förderpumpe bzw. an sich anschließenden Komponenten angebracht werden.The end pieces of the stator can preferably be designed such that the axial ends of the stator body formed in the form of an elastomer body reinforced with a thread insert are clamped by means of the end pieces. By clamping the axial ends of the stator body by means of the end pieces, which are connected to each other via the tie rods, the stator is held in its predetermined shape and the stator can be attached via the end pieces to the feed pump or to adjoining components.

Gemäß einer Ausführungsform der Erfindung kann vorgesehen sein, dass der Statorkörper einen Halterungsabschnitt und einen die Aufnahmeöffnung umfassenden Aufnahmeabschnitt aufweist, wobei der Halterungsabschnitt den Aufnahmeabschnitt zumindest abschnittsweise radial umgibt.According to one embodiment of the invention, it can be provided that the stator body has a mounting portion and a receiving portion comprising the receiving opening, wherein the mounting portion radially surrounds the receiving portion at least in sections.

Diese Art von Stator wird bevorzugt bei Pumpen bzw. Förderpumpen verwendet, die einen starr gelagerten Rotor aufweisen. Die Exzenterbewegung zur Erzeugung der Pumpkammern muss bei derartigen Pumpen über den Stator erzeugt werden, denn der wendelförmige Rotor ist zwar drehbar, jedoch nicht in radialer Richtung zur Erzeugung einer Exzenterbewegung auslenkbar. Die zum Pumpbetrieb notwendige Exzenterbewegung wird bei einer derartigen Pumpe durch den Aufnahmeabschnitt des Statorkörpers erreicht, der im Betrieb durch den rotierenden, wendelförmigen Rotor ausgelenkt wird und derart eine Exzenterbewegung ausführen kann. Durch den auslenkbaren Aufnahmeabschnitt können zwei Förderkammern zwischen dem Rotor und dem Aufnahmeabschnitt bzw. zwischen deren korrespondierenden Wendelkonturen gebildet werden, um das zu fördernde Medium durch den Stator zu fördern.This type of stator is preferably used in pumps or feed pumps, which have a rigidly mounted rotor. The eccentric movement for generating the pumping chambers must be generated in such pumps via the stator, because the helical rotor is indeed rotatable, but not deflected in the radial direction to produce an eccentric movement. The eccentric movement necessary for pumping operation is achieved in such a pump by the receiving portion of the stator body, which is deflected during operation by the rotating, helical rotor and can thus perform an eccentric movement. By the deflectable receiving portion, two delivery chambers between the rotor and the receiving portion or between the corresponding helical contours are formed to promote the medium to be delivered through the stator.

Der Halterungsabschnitt und der Aufnahmeabschnitt können über einen sich abgewinkelt zur Längsachse erstreckenden Abschnitt miteinander verbunden sein. Im Gegensatz zu dem Verbindungsabschnitt können sich der Halterungsabschnitt und der Aufnahmeabschnitt in Richtung der Längsachse erstrecken.The holding portion and the receiving portion may be connected to one another via an angled portion extending to the longitudinal axis. In contrast to the connecting portion, the holding portion and the receiving portion may extend in the direction of the longitudinal axis.

Ein erstes Ende des Statorkörpers kann über Endstücke des Stators klemmbar sein. Dabei kann das zweite Ende des Statorkörpers radial einwärts des ersten Endes liegen. Die beiden Enden des Statorkörpers können hier beispielsweise in einer im Wesentlichen senkrecht zur Längsachse verlaufenden Ebene liegen.A first end of the stator body can be clamped via end pieces of the stator. In this case, the second end of the stator body may lie radially inwardly of the first end. The two ends of the stator body can lie here, for example, in a plane extending substantially perpendicular to the longitudinal axis.

Der Aufnahmeabschnitt kann gemäß dieser Ausführungsform mit einer wendelförmigen Kontur versehen sein.The receiving portion may be provided with a helical contour according to this embodiment.

Die vorliegende Erfindung betrifft ferner eine Förderpumpe mit einem Stator gemäß der voranstehend beschriebenen Art.The present invention further relates to a feed pump with a stator according to the type described above.

Die vorliegende Erfindung betrifft auch eine Exzenterschneckenpumpe mit einem voranstehend beschriebenen Stator.The present invention also relates to an eccentric screw pump having a stator as described above.

Im Folgenden wird eine beispielhafte Ausführungsform der vorliegenden Erfindung mit Bezug auf die beigefügten Figuren beschrieben.Hereinafter, an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

Es stellen dar:

Fig. 1
eine perspektivische Ansicht eines Stators gemäß einer ersten Ausführungsform der Erfindung;
Fig. 2
eine Vorderansicht des Stators gemäß Fig. 1;
Fig. 3
eine Seitenansicht des Stators gemäß der Figuren 1 und 2;
Fig. 4
eine Schnittansicht entlang der Schnittlinie II-II aus Fig. 2;
Fig. 5
eine Schnittansicht entlang der Schnittlinie III-III gemäß Fig. 3;
Fig. 6
eine Detailansicht des Abschnitts V gemäß Fig. 5; und
Fig. 7
eine Schnittansicht eines Stators gemäß einer zweiten Ausführungsform der Erfindung.
They show:
Fig. 1
a perspective view of a stator according to a first embodiment of the invention;
Fig. 2
a front view of the stator according to Fig. 1 ;
Fig. 3
a side view of the stator according to the FIGS. 1 and 2 ;
Fig. 4
a sectional view taken along the section line II-II Fig. 2 ;
Fig. 5
a sectional view along the section line III-III according to Fig. 3 ;
Fig. 6
a detailed view of the section V according to Fig. 5 ; and
Fig. 7
a sectional view of a stator according to a second embodiment of the invention.

Fig. 1 zeigt eine perspektivische Ansicht eines Stators für eine Förderpumpe, der allgemein mit 10 bezeichnet ist. Fig. 1 shows a perspective view of a stator for a feed pump, which is generally designated 10.

Der Stator 10 weist Endstücke 12 und 14 auf, die über Zuganker 16 (in Fig. 1 drei Zuganker gezeigt) miteinander verbunden sind. Zwischen den Endstücken 12 und 14 erstreckt sich der Statorkörper 18, der in Form eines zumindest abschnittsweise mit einer Fadeneinlage (nicht gezeigt) verstärkten Elastomerkörpers 20 ausgebildet ist.The stator 10 has end pieces 12 and 14, which via tie rods 16 (in Fig. 1 three tie rods shown) are interconnected. Between the end pieces 12 and 14 extends the stator body 18, which is in the form of an at least partially with a thread insert (not shown) reinforced elastomer body 20 is formed.

Die Endstücke 12 und 14 sind gemäß Fig. 1 mehrteilig ausgebildet, worauf im Folgenden näher eingegangen wird.The end pieces 12 and 14 are according to Fig. 1 formed in several parts, which will be discussed in more detail below.

In dem Endstück 14 ist eine Öffnung 22 erkennbar, durch die sich ein Endabschnitt 24 eines Rotors 26 erstreckt.In the end piece 14, an opening 22 can be seen, through which an end portion 24 of a rotor 26 extends.

Mit dem Endabschnitt 24 kann der Rotor 26 mit einer Antriebseinrichtung (nicht gezeigt), die beispielsweise aus einem Motor und einer Gelenkwelle bestehen kann, verbunden sein. Der Rotor 26 führt im Betrieb mit einer Förderpumpe eine exzentrische und rotatorische Bewegung ausführen. Eine Gelenkwelle zur Verbindung eines Motors mit dem Rotor 26 kann beispielsweise zwei kadanische Gelenke aufweisen. Ferner kann die Verbindung zwischen Motor und Rotor 26 über einen flexiblen Biegestab hergestellt werden.With the end portion 24, the rotor 26 with a drive means (not shown), which may for example consist of a motor and a propeller shaft, be connected. The rotor 26 performs in operation with a feed pump perform an eccentric and rotational movement. A propeller shaft for connecting a motor to the rotor 26 may, for example, have two kadan joints. Furthermore, the connection between the motor and rotor 26 can be made via a flexible bending rod.

In Fig. 1 erkennt man ferner an dem Elastomerkörper 20 bzw. Statorkörper 18 Abstützelemente 28, die an der Außenumfangsfläche 30 des Statorkörpers 18 um die und in Richtung der Längsachse L verteilt angeordnet sind. Der Rotorkörper 18 ist wendelförmig bzw. helixförmig ausgebildet, wobei die Abstützelemente 28 am Außenumfang der Helixform bzw. Wendelform vorgesehen sind.In Fig. 1 can be seen further on the elastomer body 20 and stator 18 supporting elements 28 which are arranged distributed on the outer peripheral surface 30 of the stator 18 around and in the direction of the longitudinal axis L. The rotor body 18 is helical or helical in shape, wherein the support elements 28 are provided on the outer periphery of the helical form or helical shape.

Die Abstützelemente 28 stützen sich an den Zugankern 16 ab bzw. legen sich an die Zuganker 16 an. Die Abstützelemente 28 weisen dazu einen konkaven Anlageabschnitt 32 auf. Durch die Anlage der Abstützelemente 28 an den Zugankern 16 wird im Betrieb einer mit dem Stator 10 versehenen Förderpumpe ein Ausbeulen bzw. Ausknicken des Statorkörpers 18 aufgrund des von dem zu fördernden Mediums ausgeübten Druckes verhindert. Anders ausgedrückt, wird der von dem zu fördernden Medium auf den Elastomerkörper 20 des Statorkörpers 18 ausgeübte Druck über die Abstützelemente 28 unter Deformation der Abstützelemente 28 auf die Zuganker 16 übertragen.The support elements 28 are based on the tie rods 16 or lie against the tie rods 16 at. The support elements 28 have for this purpose a concave contact portion 32. Due to the installation of the support elements 28 on the tie rods 16, a bulging or buckling of the stator body 18 due to the medium to be conveyed is produced during operation of a delivery pump provided with the stator 10 exerted pressure prevented. In other words, the pressure exerted by the medium to be conveyed on the elastomer body 20 of the stator body 18 is transmitted via the support elements 28 to the tie rods 16 with deformation of the support elements 28.

Wie ferner in Fig. 1 gezeigt ist, sind die Endstücke 12 und 14 mehrteilig ausgebildet und weisen Endstückteile 12a, 12b und 14a, 14b auf. Die Endstückteile 12a und 12b sind, wie in Fig. 1 gezeigt ist, über Befestigungsmittel in Form von Schrauben 34 miteinander verbunden. Gleiches gilt für die Endstückteile 14a, 14b, was in Fig. 1 andeutungsweise erkennbar ist.As further in Fig. 1 is shown, the end pieces 12 and 14 are formed in several parts and have tail portions 12a, 12b and 14a, 14b. The tail parts 12a and 12b are as in FIG Fig. 1 is shown connected via fastening means in the form of screws 34. The same applies to the tail parts 14a, 14b, which in Fig. 1 is hinted at.

Fig. 2 zeigt eine Vorderansicht des Stators 10. Fig. 2 shows a front view of the stator 10th

In Fig. 2 erkennt man die Endstückteile 12a und 12b des Endstücks 12 sowie die Endstückteile 14a und 14b des Endstücks 14, die ebenso wie die Endstückteile 12a und 12b über Schrauben 34 miteinander verbunden sind.In Fig. 2 One recognizes the end piece parts 12a and 12b of the end piece 12 and the end piece parts 14a and 14b of the end piece 14, which, like the end piece parts 12a and 12b, are connected to one another via screws 34.

In Fig. 2 wird die Helixform bzw. Wendelform des Statorkörpers 18 ersichtlich, wobei über den Radius der Helixform des Statorkörpers 18 in Längsrichtung verteilt die Abstützelemente 28 angeordnet sind. Die Abstützelemente 28 stützen sich jeweils an den sich zwischen den Endstücken 12 und 14 erstreckenden Zugankern 16 ab.In Fig. 2 the helix shape or helical shape of the stator body 18 can be seen, wherein distributed over the radius of the helical shape of the stator body 18 in the longitudinal direction, the support elements 28 are arranged. The support elements 28 are each supported on the extending between the end pieces 12 and 14 tie rods 16.

Fig. 3 zeigt eine Seitenansicht des Stators 10. Fig. 3 shows a side view of the stator 10th

In Fig. 3 erkennt man das Endstück 14 bzw. das topfartig ausgebildete Endstückteil 14b sowie die darin ausgebildete Öffnung 22. In einer Aufnahmeöffnung 36 bzw. in einer Ausnehmung 36 in dem Statorkörper 18 ist der Rotor 26 aufgenommen. Der Eingang der Öffnung 36 in dem Statorkörper 18 bzw. Elastomerkörper 20 erstreckt sich quer zur Längsachse länglich, um die exzentrische Bewegung des Rotors 26 zu unterstützen.In Fig. 3 One recognizes the end piece 14 or the cup-shaped end piece part 14b and the opening 22 formed therein. The rotor 26 is accommodated in a receiving opening 36 or in a recess 36 in the stator body 18. The entrance of the aperture 36 in the stator body 18 and elastomeric body 20, respectively, extends longitudinally transversely of the longitudinal axis to assist in the eccentric movement of the rotor 26.

In Fig. 3 ist ferner die wendelartige Struktur WS der Ausnehmung bzw. Öffnung 36 in Richtung der Achse L erkennbar.In Fig. 3 Furthermore, the helical structure WS of the recess or opening 36 in the direction of the axis L can be seen.

Fig. 4 zeigt eine Schnittansicht entlang der Schnittlinie II-II aus Fig. 2. Fig. 4 shows a sectional view along the section line II-II Fig. 2 ,

In Fig. 4 sind das Endstück 12 bzw. das Endstückteil 12b, die Schrauben 34, die die Endstückteile 12a und 12b (Fig. 2) miteinander verbinden und der Rotor 26 gezeigt, der sich durch die Öffnung 36 erstreckt.In Fig. 4 are the end piece 12 and the end piece part 12b, the screws 34, the end piece parts 12a and 12b ( Fig. 2 ) and the rotor 26 extending through the opening 36 is shown.

Die Abstützelemente 28 legen sich an die Zuganker 16 über ihre Anlageabschnitte 32 an.The support elements 28 attach themselves to the tie rods 16 via their abutment sections 32.

In Fig. 4 ist erstmals die Fadeneinlage 38 zu sehen, die in dem Elastomerkörper 20 des Statorkörpers 18 eingebettet ist, um den Elastomerkörper 20 zu verstärken.In Fig. 4 For the first time, it is possible to see the thread insert 38 which is embedded in the elastomer body 20 of the stator body 18 in order to reinforce the elastomer body 20.

Die Öffnung 36 in dem Statorkörper 18, durch die sich der Rotor 26 erstreckt, weist aufgrund der Wendel- bzw. Helixform des Statorkörpers 18 in der Schnittansicht gemäß Fig. 4 erneut eine längliche Form auf.The opening 36 in the stator body 18, through which the rotor 26 extends, is due to the helical shape of the stator body 18 in the sectional view according to Fig. 4 again an elongated shape.

Fig. 5 zeigt eine Schnittansicht entlang der Schnittlinie III-III aus Fig. 3. Fig. 5 shows a sectional view taken along the section line III-III Fig. 3 ,

In Fig. 5 ist nun deutlich die Fadeneinlage 38 erkennbar, die sich in Richtung der Längsachse L des Stators 10 durch den Elastomerkörper 20 des Statorkörpers 18 erstreckt bzw. in den Elastomerkörper 20 eingebettet ist.In Fig. 5 Now clearly the thread insert 38 can be seen, which extends in the direction of the longitudinal axis L of the stator 10 through the elastomer body 20 of the stator body 18 and is embedded in the elastomer body 20.

Die axialen Enden des Statorkörpers 18 werden jeweils von den Endstückteilen 12a und 12b bzw. 14a und 14b geklemmt, um den Statorkörper 18 an den Endstücken 12 und 14 zu befestigen bzw. den Statorkörper 18 zusammen mit den Zugankern 16 in Form zu halten. Zur Befestigung der axialen Enden des Statorkörpers 18 sind in den Endstückteilen 12b und 14a Ausnehmungen 12c und 14c vorgesehen, in denen die axialen Enden des Statorkörpers 18 aufgenommen werden. Über die Schrauben 34 werden die axialen Enden des Statorkörpers 18 zwischen den entsprechenden Endstückteilen 12a, 12b und 14a, 14b geklemmt.The axial ends of the stator body 18 are respectively clamped by the tail portions 12a and 12b and 14a and 14b, respectively, to fix the stator body 18 to the end pieces 12 and 14 and to hold the stator body 18 together with the tie rods 16. For attachment of the axial ends of the stator body 18 recesses 12 c and 14 c are provided in the end piece parts 12 b and 14 a, in which the axial ends of the stator body 18 are received. Via the screws 34, the axial ends of the stator body 18 are clamped between the respective end piece parts 12a, 12b and 14a, 14b.

Die Öffnung 36 bzw. die Ausnehmung 36 erstreckt sich in Richtung der Längsachse L des Statorkörpers 18 durch diesen hindurch. Die Ausnehmung 36 ist in ihrem Inneren ebenfalls mit einer helixförmigen oder wendelförmigen Kontur versehen. Durch die Ausnehmung 36 wiederum erstreckt sich, wie in Fig. 5 gezeigt ist, der Rotor 26. Der Rotor 26 ist ebenfalls wendelförmig bzw. helixförmig ausgebildet.The opening 36 or the recess 36 extends in the direction of the longitudinal axis L of the stator body 18 therethrough. The recess 36 is also provided in its interior with a helical or helical contour. Through the recess 36 in turn extends, as in Fig. 5 The rotor 26 is likewise helical or helical.

Die Helixform des Rotors 26 und die Helixform der Ausnehmung 36 in dem Elastomerkörper 20 des Statorkörpers 18 wirken zur Förderung des zu fördernden Mediums zusammen, da durch die Helixform des Statorkörpers 18 und des Rotors 26 Förderkammern ausgebildet werden, die eine kontinuierliche und pulsationsfreie Förderung des Förderguts durch die Pumpe ermöglichen. Der Rotor 26 kann dabei durch seine Wendelform bzw. durch seinen exzentrischen Antrieb bestimmte Abschnitte des Statorkörpers 18 zur Bildung einer oder mehrerer Förderkammer(n) berühren oder auch auslenken.The helix shape of the rotor 26 and the helix shape of the recess 36 in the elastomer body 20 of the stator body 18 cooperate to promote the medium to be conveyed, since by the helical shape of the stator body 18 and the rotor 26th Delivery chambers are formed, which allow a continuous and pulsation-free conveyance of the conveyed by the pump. The rotor 26 can touch or deflect certain sections of the stator body 18 to form one or more delivery chamber (s) due to its spiral shape or its eccentric drive.

Da mit derartigen Pumpen häufig dickflüssige, hoch viskose und abrasive Medium, wie Öl, Fette und schlammartige Abwässer gefördert werden, wird während es Betriebs einer Förderpumpe bzw. einer Exzenterpumpe ein relativ hoher Druck auf den Statorkörper 18 ausgeübt. Dieser Druck kann unter Deformation der Abstützelemente 28 auf die Zuganker 16 übertragen werden, wodurch ein Ausbeulen bzw. ein Aufknicken und auch ein Verdrehen des Statorkörpers 18 aufgrund des Druckes des zu fördernden Mediums verhindert wird. Das zu fördernde Medium tritt bei dem Endstück 14 (Figur 5 - rechte Seite in Richtung der Längsachse L) in den Statorkörper 18 ein, wird durch die Bewegung des Rotors 26 durch den Statorkörper 18 gefördert und strömt aus der Öffnung 36 über das Endstück 12 bzw. das Endstückteil 12a mit seinem rohrförmigen Anschlussstück aus dem Stator 10 aus (Figur 5 - linke Seite in Richtung der Längsachse L).Since with such pumps often viscous, highly viscous and abrasive medium, such as oil, fats and sludge-like effluents are promoted, a relatively high pressure is exerted on the stator body 18 during operation of a feed pump or an eccentric pump. This pressure can be transmitted to the tie rods 16 with deformation of the support elements 28, whereby buckling or buckling and also rotation of the stator body 18 due to the pressure of the medium to be conveyed is prevented. The medium to be conveyed occurs at the end piece 14 (FIG. FIG. 5 - Right side in the direction of the longitudinal axis L) in the stator 18, is conveyed by the movement of the rotor 26 through the stator 18 and flows from the opening 36 via the end piece 12 and the end piece 12 a with its tubular connector from the stator 10th out ( FIG. 5 - Left side in the direction of the longitudinal axis L).

Der Rotor 26 weist zur Befestigung an einer Gelenkwelle oder dergleichen einer Öffnung 40 auf.The rotor 26 has an opening 40 for attachment to a propeller shaft or the like.

Fig. 6 zeigt eine Detailansicht des Details V aus Fig. 5. Fig. 6 shows a detailed view of the detail V from Fig. 5 ,

In dieser Ansicht wird die Fadeneinlage 38 deutlich, die in das Elastomer des Elastomerkörpers 20 des Statorkörpers 18 eingeschlossen ist.In this view, the thread insert 38 becomes clear, which is enclosed in the elastomer of the elastomer body 20 of the stator body 18.

Bei der Herstellung des Statorkörpers 18 muss, anders als beim Stand der Technik, keine Verbindung zwischen dem Elastomer und einem Metallrohr hergestellt werden. Bei dem erfindungsgemäßen Statorkörper 18 wird die Fadeneinlage 38 in einen Elastomerkörper 20 eingebettet und das Elastomer wird anschließend vulkanisiert, wodurch eine Verbindung zwischen dem Elastomer und der Fadeneinlage hergestellt wird.In the manufacture of the stator body 18, unlike the prior art, no connection must be made between the elastomer and a metal pipe. In the stator body 18 according to the invention, the thread insert 38 is embedded in an elastomer body 20 and the elastomer is then vulcanized, whereby a connection between the elastomer and the thread insert is produced.

Im Folgenden wird eine zweite Ausführungsform des erfindungsgemäßen Stators beschrieben, wobei gleichwirkende und gleichartige Komponenten mit den selben Bezugszeichen versehen sind, jedoch mit der Ziffer "1" vorangestellt.In the following, a second embodiment of the stator according to the invention will be described, wherein similar components and similar components are provided with the same reference numerals, but preceded by the numeral "1".

Der Stator 110 gemäß der zweiten Ausführungsform weist Endstücke 112 und 114 auf. In dem Endstück 114 ist eine Öffnung 142 ausgebildet, durch die das zu fördernde Medium in den Stator 110 eintritt. In dem Endstück 114 ist ferner eine Aufnahmeöffnung 122 ausgebildet, die den Endabschnitt 124 des Rotors 126 aufnimmt bzw. in der der Endabschnitt 124 des Rotors 126 gelagert ist. Der Rotor 126 ist drehbar in der Aufnahmeöffnung 122 gelagert, kann jedoch aufgrund der starren Lagerung in der Öffnung 122 keine Exzenterbewegung ausführen. Der Endabschnitt 124 des Rotors 126 ist rohrförmig ausgebildet, wohingegen der in der Öffnung 136 des Statorkörpers 118 bzw. des Elastomerkörpers 120 aufgenommene Abschnitt des Rotors 126 wendelförmig ausgebildet ist.The stator 110 according to the second embodiment has end pieces 112 and 114. In the end piece 114, an opening 142 is formed, through which the medium to be conveyed enters the stator 110. In the end piece 114, a receiving opening 122 is further formed, which receives the end portion 124 of the rotor 126 and in which the end portion 124 of the rotor 126 is mounted. The rotor 126 is rotatably supported in the receiving opening 122, but can not perform any eccentric movement due to the rigid mounting in the opening 122. The end portion 124 of the rotor 126 is tubular, whereas the portion of the rotor 126 received in the opening 136 of the stator body 118 and the elastomer body 120, respectively, is formed helically.

Neben dem die Öffnung 136 aufweisenden Aufnahmeabschnitt 144 umfasst der Statorkörper 118 einen Halterungsabschnitt 146, der den Aufnahmeabschnitt 144 radial umgibt. Der Aufnahmeabschnitt 144 und der Halterungsabschnitt 146 sind über einen Verbindungsabschnitt 148 miteinander verbunden. Der Verbindungsabschnitt 148 erstreckt sich abgewinkelt zur Längsachse L, wohingegen sich der Aufnahmeabschnitt 144 und der Halterungsabschnitt 146 in Richtung der Längsachse L erstrecken. Der Verbindungsabschnitt bildet einen Teil der Aufnahmeöffnung 136 des Elastomerkörpers 120. Ein erstes Ende 150 des Elastomerkörpers 120 ist zwischen den Endstückteilen 112a und 112b des Endstücks 112 geklemmt. Das zweite Ende 152 des Elastomerkörpers 120 ist radial einwärts des ersten Endes 150 vorgesehen und steht mit den Endstückteilen 112a, 112b nicht in Verbindung. Das zweite Ende 152 und der Aufnahmeabschnitt 144 sind beweglich. Dem Aufnahmeabschnitt 144 wird im Betrieb von dem rotierenden Rotor 126 eine Exzenterbewegung aufgezwungen, die für den Pumpvorgang notwendig ist.In addition to the receiving portion 144 having the opening 136, the stator body 118 comprises a holding portion 146 which radially surrounds the receiving portion 144. The receiving portion 144 and the holding portion 146 are connected to each other via a connecting portion 148. The connecting portion 148 extends at an angle to the longitudinal axis L, whereas the receiving portion 144 and the support portion 146 extend in the direction of the longitudinal axis L. The connecting portion forms part of the receiving opening 136 of the elastomeric body 120. A first end 150 of the elastomeric body 120 is clamped between the tail portions 112a and 112b of the end piece 112. The second end 152 of the elastomeric body 120 is provided radially inward of the first end 150 and is not in communication with the tail portions 112a, 112b. The second end 152 and the receiving portion 144 are movable. The receiving portion 144 is forced in operation by the rotating rotor 126 an eccentric movement, which is necessary for the pumping operation.

Der Elastomerkörper 120 umfasst die Fadeneinlage 138, die sich vollständig durch den Elastomerkörper 120 erstreckt und ebenfalls in den Endstückteilen 112a und 112b geklemmt wird.The elastomeric body 120 includes the suture liner 138 that extends completely through the elastomeric body 120 and is also clamped in the tailpiece portions 112a and 112b.

Der Stator 110 umfasst einen rohrförmigen Abschnitt 154, der sich zwischen den Endstücken 114 und 112 erstreckt. Der Halterungsabschnitt 146 des Elastomerkörpers 120 legt sich an den rohrförmigen Abschnitt 154 an. Ausgehend von dem Halterungsabschnitt 146 erstreckt sich der Verbindungsabschnitt 148 des Elastomerkörpers 120 radial einwärts und geht in die Aufnahmeöffnung 136 über, bzw. verbindet den Halterungsabschnitt 146 mit dem mit einer wendelförmigen bzw. helixförmigen Kontur versehenen Aufnahmeabschnitt 144. Der Aufnahmeabschnitt 144 nimmt den Rotor 126 zumindest abschnittsweise auf.The stator 110 includes a tubular portion 154 that extends between the end pieces 114 and 112. The support portion 146 of the elastomeric body 120 abuts the tubular portion 154. Starting from the support portion 146, the connecting portion 148 of the elastomeric body 120 extends radially inward and merges into the receiving opening 136, or connects the support portion 146 with the helically shaped contoured receiving portion 144. The receiving portion 144 at least receives the rotor 126 in sections.

Der Stator 110 gemäß dieser Ausführungsform ist insbesondere für Pumpen ausgebildet, bei denen der Rotor 126 starr angeordnet ist und nur eine Drehbewegung um die Längsachse L ausführt. Der Rotor 126 kann keine Exzenterbewegung ausführen. Die zum Pumpbetrieb notwendige Exzenterbewegung wird bei einer derartigen Pumpe durch den Aufnahmeabschnitt 144 des Statorkörpers 118 erreicht, der im Betrieb durch den rotierenden, wendelförmigen Rotor 126 ausgelenkt wird und derart eine Exzenterbewegung ausführen kann. Die Exzenterbewegung des auslenkbaren Aufnahmeabschnitts 144 wird auch aufgrund des beweglichen Endes 152 ermöglicht, das nicht an dem Stator 110 bzw. dem Endstück 112 befestigt ist. Durch den auslenkbaren Aufnahmeabschnitt 144 können zwei Förderkammern zwischen dem Rotor 126 und dem Aufnahmeabschnitt 144 bzw. zwischen deren korrespondierenden Wendelkonturen gebildet werden, um das zu fördernde Medium durch den Stator 110 zu fördern.The stator 110 according to this embodiment is particularly designed for pumps in which the rotor 126 is rigidly arranged and performs only a rotational movement about the longitudinal axis L. The rotor 126 can not perform an eccentric movement. The eccentric movement necessary for pumping operation is achieved in such a pump by the receiving portion 144 of the stator body 118, which is deflected in operation by the rotating helical rotor 126 and so can perform an eccentric movement. The eccentric movement of the deflectable receiving portion 144 is also possible due to the movable end 152 which is not attached to the stator 110 and the end piece 112, respectively. By the deflectable receiving portion 144 two delivery chambers between the rotor 126 and the receiving portion 144 or between the corresponding helical contours are formed to promote the medium to be conveyed through the stator 110.

Anders ausgedrückt, wird die für den Pumpbetrieb notwendige Exzenterbewegung bei derartigen Pumpen durch die Drehbewegung des Rotors 126 und die Auslenkung des Aufnahmeabschnitts 144 des Elastomerkörpers 120 relativ zur Längsachse L erreicht.In other words, the eccentric motion necessary for the pumping operation is achieved in such pumps by the rotational movement of the rotor 126 and the deflection of the receiving portion 144 of the elastomer body 120 relative to the longitudinal axis L.

Claims (14)

  1. A stator (10), in particular for an eccentric screw pump, wherein the stator (10) comprises a stator body (18) comprising an accommodation hole (36) configured for accommodating a rotor (26),
    wherein the stator body (18) is configured as an elastomer body (20) reinforced at least in sections with a thread inlay (38), characterized in that the stator (10) is configured without an outer metal tube.
  2. The stator (10) according to claim 1,
    characterized in that the stator body (18) is configured helical, and the accommodation hole (36) helically extends through the stator body (18) along the longitudinal axis (L) thereof.
  3. The stator (10) according to claim 1 or 2,
    characterized in that the thread inlay (38) extends in the direction of the longitudinal axis (L) through the stator body (18).
  4. The stator (10) according to any one of the preceding claims,
    characterized in that the thread inlay (38) extends around the longitudinal axis of the stator (10) in the elastomer body (20) in the form of a winding.
  5. The stator (10) according to claim 4,
    characterized in that the winding of the thread inlay (38) consists of several layers, wherein at least individual layers of the winding are crosswise wound.
  6. The stator (10) according to any one of the preceding claims,
    characterized in that supporting elements (28) are provided on the stator body (18) on its outer circumferential surface (30) in a way distributed along its longitudinal extension.
  7. The stator (10) according to any one of the preceding claims,
    characterized in that the stator (10) comprises at least one tie rod (16) which is connected to end pieces (12, 14) at the axial ends of the stator body (18).
  8. The stator (10) according to claim 6 or 7,
    characterized in that supporting elements (28) provided on the outer circumferential surface (30) of the stator body (18) rest against the at least one tie rod (16).
  9. The stator (10) according to claim 7 or 8,
    characterized in that the end pieces (12, 14) of the stator (10) are configured such that the axial ends of the stator body (18), which is configured in the form of an elastomer body (20) reinforced with a thread inlay (38), can be seized by means of the end pieces (12, 14).
  10. The stator (110) according to claim 1,
    characterized in that the stator body (118) comprises a retainer portion (146) and an accommodation portion (144) encompassing the accommodation hole (136), wherein the retainer portion (146) radially surrounds the accommodation portion (144) at least in sections.
  11. The stator (110) according to claim 10,
    characterized in that the retainer portion (146) and the accommodation portion (144) are connected to each other via a connection portion (148) extending at an angle to the longitudinal axis (L).
  12. The stator (110) according to claim 10 or 11,
    characterized in that a first end (150) of the stator body (118) is seizable via at least one end piece (112) of the stator (110), wherein the second end (152) of the stator body (118) is arranged radially inwards of the first end (150).
  13. The stator (110) according to claims 10 to 12,
    characterized in that the accommodation portion (144) has a spiral-shaped or helical contour.
  14. An eccentric screw pump comprising a stator (10; 110) according to any one of claims 1 to 13.
EP14716317.4A 2013-05-06 2014-04-09 Stator for a feed pump Not-in-force EP2994640B1 (en)

Applications Claiming Priority (2)

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DE202013004219U DE202013004219U1 (en) 2013-05-06 2013-05-06 Stator for a feed pump
PCT/EP2014/057149 WO2014180621A1 (en) 2013-05-06 2014-04-09 Stator for a feed pump

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EP2994640A1 EP2994640A1 (en) 2016-03-16
EP2994640B1 true EP2994640B1 (en) 2018-03-14

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US (1) US10113426B2 (en)
EP (1) EP2994640B1 (en)
CN (1) CN105358833B (en)
DE (2) DE202013004219U1 (en)
WO (1) WO2014180621A1 (en)

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Publication number Publication date
CN105358833B (en) 2018-04-03
DE112014002291A5 (en) 2016-02-18
US20160084085A1 (en) 2016-03-24
DE202013004219U1 (en) 2013-05-17
CN105358833A (en) 2016-02-24
WO2014180621A1 (en) 2014-11-13
EP2994640A1 (en) 2016-03-16
US10113426B2 (en) 2018-10-30

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