EP2994640B1 - Stator for a feed pump - Google Patents
Stator for a feed pump Download PDFInfo
- 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
Links
- 229920001971 elastomer Polymers 0.000 claims description 44
- 239000000806 elastomer Substances 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 8
- 230000004308 accommodation Effects 0.000 claims 7
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000005086 pumping Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/10—Rotary-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
- F01C1/101—Moineau-type
-
- 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
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-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
- F04C18/10—Rotary-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
- F04C18/107—Rotary-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
- F04C18/1075—Rotary-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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/04—Composite, 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
Aus dem Dokument
Ferner offenbart das Dokument
Weiterhin offenbart das Dokument
Das Dokument
Aus dem Stand der Technik sind auch Statoren bekannt, die einen wendelförmigen Statorkörper aufweisen. Ein derartiger Stator ist beispielsweise in dem Dokument
Die Herstellung der aus dem Stand der Technik bekannten Statoren folgt zumeist dem in
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 und2 ; - 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.
- 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 and2 ; - 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.
Der Stator 10 weist Endstücke 12 und 14 auf, die über Zuganker 16 (in
Die Endstücke 12 und 14 sind gemäß
In dem Endstück 14 ist eine Öffnung 22 erkennbar, durch die sich ein Endabschnitt 24 eines Rotors 26 erstreckt.In the
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
In
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
Wie ferner in
In
In
In
In
In
Die Abstützelemente 28 legen sich an die Zuganker 16 über ihre Anlageabschnitte 32 an.The
In
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
In
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
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
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
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 (
Der Rotor 26 weist zur Befestigung an einer Gelenkwelle oder dergleichen einer Öffnung 40 auf.The
In dieser Ansicht wird die Fadeneinlage 38 deutlich, die in das Elastomer des Elastomerkörpers 20 des Statorkörpers 18 eingeschlossen ist.In this view, the
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
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
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
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
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
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
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
Claims (14)
- 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. - 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. - 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). - 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. - 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. - 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. - 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). - 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). - 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). - 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. - 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). - 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). - The stator (110) according to claims 10 to 12,
characterized in that the accommodation portion (144) has a spiral-shaped or helical contour. - An eccentric screw pump comprising a stator (10; 110) according to any one of claims 1 to 13.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2994640A1 EP2994640A1 (en) | 2016-03-16 |
EP2994640B1 true EP2994640B1 (en) | 2018-03-14 |
Family
ID=48652899
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14716317.4A Not-in-force EP2994640B1 (en) | 2013-05-06 | 2014-04-09 | Stator for a feed pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US10113426B2 (en) |
EP (1) | EP2994640B1 (en) |
CN (1) | CN105358833B (en) |
DE (2) | DE202013004219U1 (en) |
WO (1) | WO2014180621A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTO20130129U1 (en) * | 2013-08-12 | 2013-11-11 | Stan Engineering Corp S R L | VOLUMETRIC PUMP WITH PROGRESSIVE CAVITY PERFECTED. |
CN104405631B (en) * | 2014-09-30 | 2016-06-01 | 余雷 | A kind of can the pump head of deep water intake |
PL3473856T3 (en) * | 2017-10-20 | 2021-07-26 | Circor Pumps North America, Llc. | Dismounting device for progressive cavity pumps |
US11268385B2 (en) * | 2019-10-07 | 2022-03-08 | Nov Canada Ulc | Hybrid core progressive cavity pump |
EP3825552A1 (en) * | 2019-11-22 | 2021-05-26 | Grundfos Holding A/S | Eccentric screw pump |
DE102020004334A1 (en) | 2020-07-20 | 2022-01-20 | Wilhelm Kächele GmbH | Stator for progressing cavity machine |
US11813580B2 (en) | 2020-09-02 | 2023-11-14 | Nov Canada Ulc | Static mixer suitable for additive manufacturing |
DE102021130260A1 (en) | 2021-11-19 | 2023-05-25 | Wilhelm Kächele GmbH | Stator for eccentric screw machine and manufacturing method for this |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3514238A (en) | 1968-09-16 | 1970-05-26 | Black & Decker Mfg Co | Cylinder for fluid pump motor and the like and method of making |
DE2712121A1 (en) * | 1977-03-19 | 1978-09-28 | Streicher Foerdertech | Eccentric screw pump |
US5807087A (en) * | 1997-03-21 | 1998-09-15 | Tarby, Inc. | Stator assembly for a progressing cavity pump |
US6102681A (en) * | 1997-10-15 | 2000-08-15 | Aps Technology | Stator especially adapted for use in a helicoidal pump/motor |
DE19804259A1 (en) | 1998-02-04 | 1999-08-12 | Artemis Kautschuk Kunststoff | Elastomer stator for eccentric screw pumps |
CN2345737Y (en) * | 1998-08-24 | 1999-10-27 | 中国船舶工业总公司第七研究院第七一一研究所 | Screw pump |
DE19842754C2 (en) * | 1998-09-18 | 2001-04-26 | Seepex Seeberger Gmbh & Co | Eccentric screw pump |
DE10338632B4 (en) | 2003-08-22 | 2005-11-03 | Wilhelm Kächele GmbH | Eccentric screw pump with erosion-resistant rotor |
JP2005344587A (en) * | 2004-06-02 | 2005-12-15 | Heishin Engineering & Equipment Co Ltd | Uniaxial eccentric screw pump |
DE102004038477B3 (en) * | 2004-08-07 | 2005-10-06 | Netzsch-Mohnopumpen Gmbh | Cavity Pump |
DE102005028818B3 (en) | 2005-06-22 | 2006-08-24 | Artemis Kautschuk- Und Kunststoff-Technik Gmbh | Stator for an eccentric screw pump comprises axially arranged stator segments connected pressure-tight on their contact points by a tube pulled onto a casing and overlapping the contact points and a radially flattened metal ring |
DE102006021897B4 (en) | 2006-05-11 | 2009-11-19 | Netzsch-Mohnopumpen Gmbh | Stator jacket for progressing cavity pumps |
DE102010000923A1 (en) | 2010-01-14 | 2011-07-21 | F-E-T Feltz-Elastomer-Technologie GmbH, 31737 | Stator for an eccentric screw pump |
US8944789B2 (en) * | 2010-12-10 | 2015-02-03 | National Oilwell Varco, L.P. | Enhanced elastomeric stator insert via reinforcing agent distribution and orientation |
CN202091195U (en) * | 2011-05-28 | 2011-12-28 | 河北恒盛泵业股份有限公司 | Single-screw pump with swinging stator |
DE102013003833A1 (en) * | 2013-03-07 | 2014-09-11 | Wilo Se | Pump with overpressure protection |
-
2013
- 2013-05-06 DE DE202013004219U patent/DE202013004219U1/en not_active Expired - Lifetime
-
2014
- 2014-04-09 CN CN201480026055.8A patent/CN105358833B/en not_active Expired - Fee Related
- 2014-04-09 US US14/889,399 patent/US10113426B2/en not_active Expired - Fee Related
- 2014-04-09 EP EP14716317.4A patent/EP2994640B1/en not_active Not-in-force
- 2014-04-09 WO PCT/EP2014/057149 patent/WO2014180621A1/en active Application Filing
- 2014-04-09 DE DE112014002291.8T patent/DE112014002291A5/en not_active Withdrawn
Also Published As
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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