EP1552149B1 - Stator pour pompe a vis sans fin excentrique - Google Patents

Stator pour pompe a vis sans fin excentrique Download PDF

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Publication number
EP1552149B1
EP1552149B1 EP03794786.8A EP03794786A EP1552149B1 EP 1552149 B1 EP1552149 B1 EP 1552149B1 EP 03794786 A EP03794786 A EP 03794786A EP 1552149 B1 EP1552149 B1 EP 1552149B1
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EP
European Patent Office
Prior art keywords
segments
hollow body
another
elastic material
casing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP03794786.8A
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German (de)
English (en)
Other versions
EP1552149A1 (fr
Inventor
Hisham Kamal
Michael Robby
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.)
Netzsch Pumpen and Systeme GmbH
Original Assignee
Netzsch Pumpen and Systeme GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Netzsch Pumpen and Systeme GmbH filed Critical Netzsch Pumpen and Systeme GmbH
Publication of EP1552149A1 publication Critical patent/EP1552149A1/fr
Application granted granted Critical
Publication of EP1552149B1 publication Critical patent/EP1552149B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
    • F04C2/1075—Construction of the stationary member

Definitions

  • the invention relates to a stator for an eccentric screw pump with a helical rotor.
  • the stator has a likewise helically shaped cavity for receiving the rotor and usually consists of an elastic material which is enclosed by a rigid jacket.
  • the DE 100 42 335 A1 shows a tube jacket for a push-in of an eccentric screw pump.
  • the rotor shell consists of two longitudinal pipe segments, which are pivotally connected to each other in the axial direction, which come to lie adjacent to each other in the closed state of the pipe shell and are fixed together with at least one locking device in its closed position.
  • the two longitudinal pipe segments have a size corresponding inner radius in which a rotor receiving elastic lining comes into concern.
  • the pipe jacket consists of only two longitudinal pipe segments and these pipe longitudinal segments span only a specific cavity cross-section, this construction is only suitable for use for a certain pump size.
  • a rotor shell which consists of three identical, axially arranged shell segments, which are clamped together by means of a belt.
  • 3 adapted to the circumference of the rotor shroud segments and the corresponding clamping means for clamping the rotor shell to the rotor itself are necessary. Without these clamping means, the shell segments can not be held on the rotor.
  • the invention has for its object to make the stator of a Exzenterschnekkenpumpe such that a cost-effective and simplified construction is possible.
  • the stator for eccentric screw pumps comprises a hollow body made of elastic material, which is enclosed by a shell of segments.
  • the longitudinal sides, at least several, but preferably all segments, are formed such that adjacent segments along the circumferential angle are variably connected to each other to produce a load-bearing positive connection and the surfaces of the individual segments are predominantly in a plane. In a typical case, such an angular range is about 10 °.
  • different numbers of elements to different diameters of the coats can be combined.
  • 10, 11, 12, 13 or even 14 segments can be combined to form a jacket, each with the segment number corresponding diameter.
  • segments of different widths can be combined. This is already with a few (for example two) different profiles by corresponding combinations and different numbers a variety of different diameters of the shell feasible.
  • the specification of the length of a segment always refers to the extension in the longitudinal direction of the stator.
  • the individual segments are designed such that the result of the connection of several segments is a closed shell in polygonal shape.
  • This polygon shape now engages in a corresponding polygonal shape of the outside of the hollow body of elastic material, so that there is a form fit for transmitting the torque.
  • the segments themselves can be made from a variety of different materials. Particularly suitable are metallic, ceramic, elastomeric or thermoplastic materials. Likewise, the segments may consist of combinations of different materials. Thus, for example, a combination of a metallic longitudinal edge and an elastomer disposed between the longitudinal sides to compensate for tolerances can be used.
  • connection between the individual segments is designed in the manner of tongue and groove.
  • the segments connected in this way are movable relative to one another.
  • connection of the segments with each other is designed such that they can be pushed together in the longitudinal direction.
  • the entire unit is particularly low, by simply pushing the segments together, mountable.
  • Another embodiment of the invention provides that the segments have bores extending in the longitudinal direction.
  • Another embodiment of the invention provides that the longitudinal sides of the segments have angular profiles, such as polygonal or dovetail profiles. In order to ensure sufficient mobility here appropriate distances are provided.
  • Another embodiment of the invention provides that the length of individual segments is shorter than the length of the hollow body.
  • at least two segments can be arranged one behind the other in the longitudinal direction of the hollow body.
  • At least two longitudinally successive segments can be laterally, i. in the direction of the circumference of the hollow body, be offset from each other.
  • the offset preferably corresponds to the width of a single segment.
  • At least two segments are connected together in the form of chain links.
  • a particularly simple and inexpensive design of the arrangement results when all the segments are connected together in the form of a large chain. So is, Particularly in the case of a large number of small chain links, optionally in the longitudinal direction or in the direction of the circumference, adaptation to the desired length of the hollow body or the circumference of the hollow body is possible.
  • At least a plurality of segments in the form of chain links are provided with spacers or integrated connecting elements.
  • several such segments can be combined into a composite in a first preassembly step.
  • Such pre-assembly is possible in a simple manner with an automatic assembly machine.
  • For final assembly to the hollow body then only a few rows of chain links, for example by means of bolts, must be connected to each other.
  • the connecting elements With a suitable arrangement of the connecting elements, the last chain link can be mounted rotated in a row by 180 degrees, so that the row of chain links is flush.
  • means are provided for limiting the angular range of movement of the segments with each other.
  • the mobility of the mounted polygon can be restricted in order to simplify the mountability, to prevent jamming of the segments with each other or to increase the rigidity of the shell.
  • an additional non-positive connection of the longitudinal sides of the segments is provided.
  • a connection can be, for example, a welded connection or also an adhesive connection.
  • Such a connection is usefully made after the individual segments have been pushed together.
  • the frictional connection the individual segments can be fixed together in a predetermined angle corresponding to the final configuration.
  • an additional frictional connection between at least one, preferably a plurality of segments and the hollow body made of elastic material is provided.
  • Such a connection can take place, for example, by vulcanization or gluing.
  • At least one segment has a surface with a particularly high roughness or additional holding teeth or a corrugation. This particular surface of the segment faces the hollow body. Due to the rough surface, the friction between the segments and the hollow body can be substantially increased, whereby the twisting / twisting of the hollow body is avoided during the rotation of the rotor.
  • At least one segment has at least one additional contact surface for supporting the hollow body.
  • the contact surface of the hollow body at the segments d. H. the area of the introduction of force between the hollow body and the segments to be increased. This leads to a higher stability and a lower deformation of the hollow body.
  • the hollow body made of elastic material is designed such that it overlaps the segments at the end faces. This results in a sealing of the segments by the elastic material of the hollow body.
  • a further embodiment of the invention provides that at least some segments consist of a mechanically rigid material which has a substantially higher stiffness relative to the hollow body of elastic material.
  • At least some of the segments have an elastic material.
  • a further embodiment of the invention is that at least one clamping means is provided, with which the diameter of the shell consisting of segments can be fixed or adjusted. This makes it possible to make an adjustment of the diameter with increasing wear of the hollow body made of elastic material.
  • Another embodiment of the invention provides additional support rings, which support the segments from the outside. As a result, the individual segments can not deform outward even at high pressures in the hollow body.
  • the equipment with support rings can be made variable, so that according to the pressure in the hollow body at higher pressure, a correspondingly higher number of support rings is used.
  • the thermal expansion coefficient of the segments is dimensioned such that it compensates for the coefficient of thermal expansion of the hollow body of elastic material.
  • At least one loosely insertable anti-twist device is provided between the hollow body and the stator jacket.
  • This can for example consist of a rod or a profile, which is advantageously inserted in the longitudinal direction and represents a positive connection between the shell and the hollow body.
  • An inventive hollow body of a stator made of elastic material for eccentric screw pumps according to the invention has a helical cavity for receiving a rotor and an outer side with a polygonal cross-section.
  • the polygonal outer side is doing with a frictional connection the polygonal inside of the shell. It is immaterial whether the individual faces of the polygon are the same size or different. It is essential that the hollow body has a plurality of longitudinally extending surfaces.
  • a stator for eccentric screw pumps has a hollow body 1 of preferably elastic material.
  • a likewise helical rotor 3 is accommodated in a helical cavity 2.
  • the outer contour of the hollow body 1 made of elastic material has a polygonal cross-section.
  • the jacket, which comprises the hollow body, consists of a plurality of segments 4a, 4b, 4c, which extend in the longitudinal direction (axially) of the hollow body. The segments are positively connected with each other.
  • the compound is resilient to train and thus limits the extent of the circumference of the hollow body.
  • a sheath according to the invention is shown in perspective.
  • This jacket consists in this example of 12 segments, three of which are exemplified by 4a, 4b, 4c.
  • segment numbers such as 10 segments or 14 segments can be realized.
  • at least three segments are necessary to enclose a cavity.
  • the upper limit for the number of segments results from the cost-effectiveness of the assembly. So a coat with an extremely high number of segments will be mountable only at high cost. Unless he is, as described later, realized in the form of a chain.
  • Fig. 3 finally shows a single segment 4 in section.
  • the connection of the individual segments with each other takes place here by a first connecting element 5, which is in engagement with a second connecting element 6 of another segment. Due to the special embodiment proposed here, the segments are movable relative to one another in a certain angular range.
  • Fig. 4 For example, segments of different widths are shown, from which coats of different diameters can be produced by combination. These are hereinafter referred to as Type 1 (11), Type 2 (10), Type 3 (9) and Type 4 (8). Of course, any dimensions of segments are the subject of the invention.
  • Fig. 5 a combination of 6 segments of the type 4 (8) and the type 3 (9) is shown, wherein the segments of different types are each alternately combined.
  • Fig. 6 is shown another combination of different segments. There are five segments of type 4 (8) and type 2 (10) each alternately combined. This results opposite to in Fig. 5 illustrated arrangement a different shape of the outer contour and another diameter.
  • Fig. 7 a combination of 12 similar type 3 (9) segments is shown.
  • the representations of the different combinations of segments in the various figures are not to scale.
  • Fig. 8 shows an arrangement in which preferably for receiving higher pressures additional support rings 12a, 12b, 12c are mounted.
  • Such support rings preferably run along the circumference and may themselves again have fastening means such as bores, on the one hand for fixing to the segments and on the other hand for fixing the support rings themselves or the entire device.
  • end rings 13a, 13b are shown, which additionally support the segments at their ends.
  • the support can be made here preferably in the longitudinal direction but also radially, as in the support rings described above.
  • a further advantageous embodiment of the invention is shown in which the individual segments 4a, 4b, 4c are connected together in the form of a chain.
  • the segments at their ends holes through which fasteners such as bolts 18, rivets or others can be inserted.
  • Fig. 10 shows a single segment 4 of an arrangement accordingly Fig. 9 ,
  • the holes 15 and the bearing surfaces 14 can be seen.
  • the bearing surfaces serve, as far as they are associated with the hollow body of elastic material facing inside of the chain, for supporting the hollow body.
  • a corresponding nearly closed inner surface is in Fig. 9 to recognize.
  • Fig. 11 shows another chain-like arrangement of the individual segments 4a, 4b, 4c.
  • the interaction of the individual chain links is clearly visible.
  • the connection of the individual segments to a chain takes place again with the help of the holes and the fastening elements, not shown here, which are held in these holes.
  • Fig. 12 is a single segment 4 of the chain-like arrangement Fig. 11 shown.
  • the bore 15 serves to connect a plurality of segments.
  • the holding teeth 16 serve to increase the friction between the segments and the hollow body made of elastic material.
  • Fig. 13 shows a further chain-like arrangement of individual segments 4a, 4b, 4c, wherein the segments are connected by bolts other than by additional connecting elements.
  • Fig. 14 shows in a detailed view individual segments with connecting elements 17, which simultaneously establish a defined distance between segments.
  • the connecting elements can fix the individual segments in arbitrary axes to each other.
  • a lateral or a fixation in the longitudinal direction of the stator is possible.
  • Fig. 15 shows in a detailed view of the fully assembled segments with associated fasteners. This arrangement of the segments results in a relatively rigid composite. Thus, the overall rigidity of the shell is significantly increased. This is particularly advantageous at high pressures.
  • Fig. 16 a chain-like arrangement is shown in which the individual segments have particularly large bearing surfaces. This results in an almost closed inner surface.
  • Fig. 17 shows a single segment of the assembly Fig. 16 , Here is the enlarged support surface 14 is particularly easy to see.
  • Fig. 18 shows a further embodiment of the segments of an arrangement Fig. 16 , In this case, the support surface on additional retaining teeth 16.
  • Fig. 19 shows another chain-like arrangement with gaps between the chain-shaped segments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Claims (25)

  1. Stator pour pompes à vis excentrée, comprenant un corps creux (1) constitué d'une matière élastique, lequel comporte un espace creux hélicoïdal (2) destiné à accueillir un rotor (3), et est pourvu d'une enveloppe extérieure, l'enveloppe comprenant plusieurs éléments (4, 4a, 4b) reliés les uns aux autres et s'étendant dans la direction axiale, de telle sorte que des segments voisins sont reliés entre eux de façon variable le long de l'angle circonférentiel, pour créer un assemblage par complémentarité de forme, résistant à la traction,
    caractérisé en ce que les surfaces des différents segments s'étendent majoritairement dans un plan, ce qui permet de combiner différents diamètres des enveloppes en raison du nombre variable de segments.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que l'assemblage de plusieurs segments en une enveloppe fermée donne une forme approximativement polygonale, et le côté extérieur (7) du corps creux constitué d'une matière élastique présente une forme approximativement polygonale, avec un nombre de surfaces correspondant au nombre de segments le long du pourtour, de manière à créer un assemblage par complémentarité de forme entre le corps creux constitué d'une matière élastique et les segments reliés entre eux.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que
    les côtés longitudinaux d'au moins deux segments (4, 4a, 4b) sont conçus de manière à ce que des segments voisins s'engagent les uns dans les autres et forment un assemblage par complémentarité de forme résistant à la traction.
  4. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    les côtés longitudinaux de plusieurs segments (4, 4a, 4b) sont conçus de manière à pouvoir être emboîtés ensemble dans le sens longitudinal.
  5. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    plusieurs segments comportent des perçages (15) s'étendant dans le sens longitudinal.
  6. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    plusieurs segments (4, 4a, 4b) sont reliés les uns aux autres dans le sens longitudinal par des éléments de fixation, tels que par exemple des boulons (18).
  7. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    les côtés longitudinaux de plusieurs segments présentent des profils circulaires s'engageant les uns dans les autres.
  8. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    les côtés longitudinaux de plusieurs segments présentent des profils anguleux s'engageant les uns dans les autres.
  9. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    la longueur des différents segments est plus courte que le corps creux, et en ce qu'au moins deux rangées de segments sont agencées les unes derrière les autres dans le sens longitudinal du corps creux.
  10. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    au moins deux segments consécutifs dans le sens longitudinal sont décalés latéralement les uns par rapport aux autres, de préférence de l'équivalent de la largeur d'un segments.
  11. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    au moins deux segments en forme de maillons de chaîne sont reliés entre eux.
  12. Dispositif selon la revendication 10,
    caractérisé en ce que
    au moins deux segments en forme de maillons de chaîne comportent des éléments d'assemblage intégrés, lesquels relient les différents maillons de chaîne les unes aux autres.
  13. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    il est prévu des moyens pour limiter la plage angulaire du mouvement des segments les uns par rapport aux autres.
  14. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    il est prévu un assemblage supplémentaire par adhérence entre les segments.
  15. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    il est prévu un assemblage supplémentaire par adhérence entre les segments et le corps creux constitué d'une matière élastique.
  16. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    sur un côté tourné vers le corps creux, au moins un segment présente une surface avec une rugosité particulièrement élevée ou des dents de retenue supplémentaires.
  17. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    au moins un segment présente au moins une surface d'appui supplémentaire pour l'appui du corps creux.
  18. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    le corps creux constitué d'une matière élastique chevauche les côtés frontaux des segments.
  19. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    l'enveloppe comporte des segments constitués d'un matériau présentant une rigidité nettement supérieure par rapport au corps creux constitué d'une matière élastique.
  20. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    l'enveloppe comprend des segments constitués d'une matière élastique.
  21. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    il est prévu au moins un moyen de serrage supplémentaire pour réduire le diamètre de l'enveloppe constituée de différents segments.
  22. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    il est prévu des anneaux d'appui supplémentaires (12a, 12b, 12c) permettant aux segments de s'appuyer par le côté extérieur.
  23. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    le coefficient de dilatation thermique des segments est ajusté en fonction du coefficient de dilatation thermique du corps creux constitué d'une matière élastique, de manière à compenser celui-ci.
  24. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    il est prévu au moins un dispositif anti-rotation apte à être inséré librement entre le corps creux et l'enveloppe du stator.
  25. Corps creux (1) d'un stator pour pompes à vis excentrée selon la revendication 1, constitué d'une matière élastique, lequel comporte un espace creux hélicoïdal (2) destiné à accueillir un rotor (3),
    caractérisé en ce que le côté extérieur du corps creux présente une section transversale polygonale.
EP03794786.8A 2002-09-10 2003-08-13 Stator pour pompe a vis sans fin excentrique Expired - Fee Related EP1552149B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10241753A DE10241753C1 (de) 2002-09-10 2002-09-10 Stator für Exzenterschneckenpumpe
DE10241753 2002-09-10
PCT/DE2003/002726 WO2004025124A1 (fr) 2002-09-10 2003-08-13 Stator pour pompe a vis sans fin excentrique

Publications (2)

Publication Number Publication Date
EP1552149A1 EP1552149A1 (fr) 2005-07-13
EP1552149B1 true EP1552149B1 (fr) 2015-10-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03794786.8A Expired - Fee Related EP1552149B1 (fr) 2002-09-10 2003-08-13 Stator pour pompe a vis sans fin excentrique

Country Status (7)

Country Link
US (1) US7137795B2 (fr)
EP (1) EP1552149B1 (fr)
JP (1) JP2005538298A (fr)
AU (1) AU2003266122A1 (fr)
BR (1) BR0306307B1 (fr)
DE (2) DE10241753C1 (fr)
WO (1) WO2004025124A1 (fr)

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DE102005028818B3 (de) 2005-06-22 2006-08-24 Artemis Kautschuk- Und Kunststoff-Technik Gmbh Stator für eine Exzenterschneckenpumpe und Verfahren zu seiner Herstellung
DE102005042559A1 (de) * 2005-09-08 2007-03-15 Netzsch-Mohnopumpen Gmbh Statorsystem
DE102006021897B4 (de) * 2006-05-11 2009-11-19 Netzsch-Mohnopumpen Gmbh Statormantel für Exzenterschneckenpumpen
WO2009024279A1 (fr) * 2007-08-17 2009-02-26 Seepex Gmbh Pompe à vis sans fin excentrique à stator segmenté
US8182252B2 (en) 2007-10-30 2012-05-22 Moyno, Inc. Progressing cavity pump with split stator
US8215014B2 (en) 2007-10-31 2012-07-10 Moyno, Inc. Method for making a stator
DE102012112044B4 (de) * 2012-05-04 2015-10-08 Netzsch Pumpen & Systeme Gmbh Selbstfixierendes Statorgehäuse
DE102012008761B4 (de) 2012-05-05 2016-01-21 Netzsch Pumpen & Systeme Gmbh Geteilter Statormantel
EP3152451B1 (fr) 2014-06-06 2019-03-06 Saint-Gobain Performance Plastics Rencol Limited Anneau de tolérance
DE102017126002B3 (de) 2017-11-07 2019-02-14 Seepex Gmbh Exzenterschneckenpumpe

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US7137795B2 (en) 2006-11-21
DE10393756D2 (de) 2005-08-11
BR0306307A (pt) 2004-09-28
BR0306307B1 (pt) 2012-06-26
DE10241753C1 (de) 2003-11-13
WO2004025124A1 (fr) 2004-03-25
EP1552149A1 (fr) 2005-07-13
AU2003266122A1 (en) 2004-04-30
JP2005538298A (ja) 2005-12-15
US20050147516A1 (en) 2005-07-07

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