EP3827171A2 - Divided stator casing - Google Patents

Divided stator casing

Info

Publication number
EP3827171A2
EP3827171A2 EP13734956.9A EP13734956A EP3827171A2 EP 3827171 A2 EP3827171 A2 EP 3827171A2 EP 13734956 A EP13734956 A EP 13734956A EP 3827171 A2 EP3827171 A2 EP 3827171A2
Authority
EP
European Patent Office
Prior art keywords
stator
jacket
collar
elastomeric body
connection
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.)
Withdrawn
Application number
EP13734956.9A
Other languages
German (de)
French (fr)
Inventor
Hisham Kamal
Christian BINDIG
Stefan Voit
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 EP3827171A2 publication Critical patent/EP3827171A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
    • F04C2/1075—Construction of the stationary member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/70—Disassembly methods

Definitions

  • the invention relates to a stator for eccentric screw pumps with a stator casing for a ver ⁇ seen with at least one collar elastomeric body for receiving a rotor, wherein the collar is arranged in a recess between the stator casing and a connection body.
  • An eccentric screw pump consists essentially of a rotatably mounted in a stator helical rotor, which rotates eccentrically with its longitudinal axis about the stator axis.
  • the side facing the rotor side of the stator has an at least two-speed corresponding to the rotor figure helical shape dop ⁇ Pelter gradient.
  • the rotor consists of an abrasion-resistant material such as steel example ⁇ and the stator of a resilient material such as rubber.
  • the elastomeric body is often provided in practice with a jacket, for example by the stator is vulcanized into the jacket.
  • the stator is subject to due to the material a ver ⁇ tively high wear, which is why an exchange of the stator or the stator casing is erfor ⁇ sary at regular intervals.
  • solutions have been sought time and again to minimize the maintenance required for replacement.
  • a stator casing an eccentric screw pump the associated order to simplify the assembly and disassembly of the elastomeric body, a stator ⁇ coat of a plurality with each other, having longitudinally extending segments.
  • the longitudinal edges of the segments are formed such that adjacent segments inei- grip one another to produce a form-fitting connection that can be loaded on a train.
  • the segments are designed so that their side facing the elastomeric body, form substantially flat surfaces.
  • the result of the connection of several segments is a closed jacket in polygonal shape. This polygonal shape engages in a corresponding polygonal shape of the outside of the elastomeric body, so that a positive fit results for the transmission of the torque and a rotational movement of the elastomeric body in the stator jacket is prevented.
  • a stator having a stator jacket and an elastomeric body that does not inhibit only rotational movement of the elastomeric body. Since during pump operation, in particular by the conveying movement of the rotor, also radial and axial forces occur, which act on the elastomeric body, the fixation of the elastomeric body should be further improved.
  • WO2011 / 155312 a special embodiment is known in which the elastomeric body is provided at both ends with a collar, whereby an effective sealing of the pump is to be achieved.
  • the collar is arranged in a recess between the stator jacket and a connection body (connection flange, pump housing).
  • Stator jacket and elastomeric body are clamped between the connecting flange and the pump housing by means of threaded rods, the adjusting distance between stator jacket and connector body is less than the collar thickness, whereby the collar is crushed and thus creates a sealed connection between the stator and connector body.
  • the elastomeric body is also axially fixed, the radially acting forces in the waistband area are only absorbed by the formed frictional connection.
  • the invention is therefore based on the object of specifying a stator jacket of the type mentioned, which allows improved fixation of the elastomeric body.
  • the stator jacket has cavities, recesses and / or elevations which are open on the face side, at least on one side.
  • the invention is based on the consideration that the fixation of the elastomeric body in the stator jacket can be improved by the elastomeric body is fixed at least one end, by an additionally acting connection, between the stator jacket and connector body.
  • the connection should also be able to absorb radially acting forces in the waistband and it should be a detachable connection.
  • stator jacket has open cavities and / or recesses in its end facing the collar.
  • the collar digs into the front side of the stator shell in such a way that the collar protrudes into the open cavities or recesses due to its elastomeric properties.
  • the stator jacket and the collar creates a positive and positive connection, which can also absorb radial forces. It is also conceivable to provide the federal government with a corresponding to the shape of the open cavities, recesses or elevations Ausack Institute or depressions.
  • connection body has a recess receiving the collar.
  • the collar protrudes in the longitudinal direction beyond the stator end side of the terminal block, so that when pressing the stator shell against the federal government, the federal government is squeezed and penetrates into the frontal openings in the stator jacket.
  • the stator jacket has a fixed larger outer diameter than the recess in the connection block.
  • the outer stator shell and the terminal block form the end face a stop.
  • the contact pressure can thus be adjusted, for example, using one and the same terminal block, by a suitably selected waistband strength.
  • the distance between the stator jacket and the connector body should be less than the collar thickness.
  • a shape corresponding to the collar is to be selected for the recess in the connection body.
  • any type of open cavities, recesses or elevations in the stator is conceivable, which is suitable for producing a front-side positive connection between the stator casing and the connection body.
  • a simple structure may suffice if the federal government can dig into the interstices / elevations formed by the structure.
  • the connection body may be provided on the front side with open cavities, recesses and / or elevations.
  • the stator is formed as a profile body, whereby the frontally open cavities are formed for the federal government.
  • Such a design would also have the advantage that the stator jacket despite material savings would have a sufficiently high strength and rigidity.
  • the stator jacket has a chamber profile.
  • the chambers may be formed by an inner stator shell wall surrounding the elastomeric body, an outer stator shell wall and partitions located therebetween.
  • the partitions extend in the longitudinal direction of the stator shell, so that open-sided cavities formed by the chamber structure arise.
  • the collar of the elastomeric body digs against the stator jacket due to its penetration into the chambers due to the contact pressure.
  • the outer diameter of the collar is to be chosen so large that the collar covers the frontally open chambers at least partially by the wall thickness of the inner stator shell wall is less than the waist height.
  • the stator jacket is formed as a longitudinally divided stator jacket comprising at least two partial shells.
  • the longitudinally divided construction of the stator jacket makes it particularly easy to replace the elastomeric body.
  • the partial shells are detachably connected to each other.
  • the partial shells are connected to each other by means of a positive connection and on the other hand by means of a closure unit.
  • a positive connection an embodiment has been found in which a cantilevered holding element of a partial shell hook-like engages in a recess of an adjacent partial shell. After opening the closure unit, the stator be folded around the positive connection around and the partial shells can be easily taken down from the elastomeric body.
  • the closure unit is designed as a quick release, in particular as a kind of screw and flap closure.
  • the partial shells can be connected to each other and thus the stator jacket can be closed.
  • the additional screw is used in particular to close a gap between the partial shells.
  • the closure unit can also be equipped with a captive safety device to prevent closure elements from coming loose from the stator jacket.
  • a receptacle for a sensor cable can also be provided.
  • the receptacle is designed as a cable channel and positioned so that the cable channel releases the sensor cable in the opener of the closure unit.
  • the sensor including sensor cable and the partial shells are removed.
  • the advantages achieved by the invention are in particular that in a stator with an exchangeable elastomeric body, the elastomeric body is securely fixed in the stator jacket. In particular, a possible movement of the elastomeric body caused by the rotor movement is effectively counteracted.
  • FIG. 1 shows the front portion of a progressing cavity pump with a stator clamped between connection bodies
  • FIG. 2 shows a cross section of the two-part stator shown in FIG. 1, FIG.
  • FIGS. 3, 4, 5 show various embodiments of the closure unit
  • Fig. 6 the elastomeric body provided with a collar at both ends, which has a polygonal outer side
  • Connection body connection a longitudinal ge cut representation.
  • stator 10 comprises a longitudinally divided stator shell 16 consisting of two partial shells 12, 14 for a elastomeric body 20 provided with at least one collar 18 for receiving a rotor.
  • the stator shell 16 is made of an aluminum alloy.
  • the eccentric screw 2 is provided with two feet 22 for mounting the pump 2 at a designated pumping station. With the help of the threaded rods 8, by tightening the threaded nuts 24, the collar 18 is clamped so far between the stator shell 16 and connector body 4,6 until the stator shell 16 abuts the connector body 4,6.
  • the two partial shells 12,14 are on the one hand by means of a positive connection 26 and other- on the other hand by means of a closure unit 28 connected to each other.
  • the closure unit 28 is located under a protective cover 30.
  • FIG. 2 A cross section of the two-part stator 10 shown in FIG. 1 is shown in FIG. 2.
  • the stator 10 has a polygonal inner side and comprises an upper partial shell 12 and a lower partial shell 14, which are connected to one another over the entire stator shell length by means of a positive connection 26 and on the other hand by means of an opposite closure unit 28 acting over the entire stator shell length ,
  • the positive connection 26 is formed by an integrally formed at one end of the upper part shell 12 hook-like holding element 32 which engages in a recess 34 introduced at the opposite end of the lower half-shell 14.
  • the positive connection 26 opposite the closure unit 28 is arranged, which represents a kind of screw and Klap connection 36.
  • the ends of the partial shells 12,14 extend radially outward and are provided with holes for a introduced from above mounting screw 38 which is screwed into a provided with an internal threaded joint rod 40.
  • Between screw head and upper part shell 12 is provided with through holes intermediate plate 42 is arranged, which serves in particular the distribution of forces acting during screwing.
  • a recess is made in both partial shells 12, 14, which form a cable duct 44 for a sensor.
  • This cable channel 44 opens due to the special arrangement during disassembly of the partial shells 12,14.
  • the disassembly is carried out essentially by the fact that the fastening screw 38 is loosened so far that they fold together with the intermediate plate 42 about the axis of rotation 46 of the articulated rod 40 from the stator 10 away. pen leaves.
  • the closure unit 28 is thus opened and the partial shells 12, 14 can be opened and removed around the positive connection 26.
  • the assembly of the partial shells 12,14 is carried out analogously in reverse order.
  • the partial shells 12,14 are interconnected by a plurality of such screw and hinged connections 36.
  • the fastening screws 38 can be folded away from the stator 10 in one operation since they are coupled together by the articulated rod 40 and the intermediate plate 42.
  • a radially extending web loss prevention device 48 is disposed below the pivot rod 40.
  • the protective cover 30 attached by means of snap fasteners to the stator 10 is provided.
  • the stator 10 has a chamber profile.
  • the chambers 50 are formed by an outer stator shell wall 52, an inner stator shell wall 54 and between them along the stator 10 extending partitions 56.
  • the chambers 50 according to the invention are open cavities in which the collar 18 of the elastomeric body 20 can dig.
  • FIGS. 3, 4 and 5 show various embodiments of the closure unit.
  • a closure unit is shown in Fig. 3, in which a screwing of the stator shell 16 by means of terminal strips 60 takes place, which can be inserted into the stator shell 16.
  • a captive for fastening screws 62 is used in this embodiment a smaller compared to the screw head opening in the upper part shell 12, so that the screw 62 can be unscrewed through the opening, not shown here only as far as that is possible within the stator shell 16, namely to the screw head the inside of the upper part shell 12 abuts.
  • a part of the fastening screw 62 is still within the terminal block 60, so that the screw 62 does not fall into the profile interior.
  • a closure unit 28 is shown, in which a closure of the partial shells 12,14 via a closing bar 64 which is used by means of a fastening screw 66 and an integrated into the upper part shell 12 threaded nut 68 to the stator shell 16 and whereby the two Partial shells 12,14 are closed due to the conical contact surfaces 70.
  • a closure unit 28 with pressure screws 72 is shown in FIG. It serves as a closing strip to a U-shaped profile strip 74, which is provided with an internal thread for the pressure screw 72.
  • a steel strip 76 is inserted as an intermediate plate in the upper part shell 12,14.
  • both partial shells are provided with a longitudinal groove-shaped recess 78.
  • FIG. 6 shows the elastomeric body 20, which is provided at both ends with a collar 18, of a rubber-like material which has a polygonal outer side, in an additionally transversely and longitudinally sectioned view.
  • the collar 18 has a waistband s and a waist height h lf h 2 .
  • the elastomeric body 20 has a two-flighted helical recess 80 for receiving the rotor.
  • the collar 18 initially projects out of the connection body 4, 6, since the collar thickness s is greater than the depth d of the recess in the connection body 4, 6. Only after the stator 10 is clamped between the connection bodies 4, 6 is the collar inserted into the recess in the connection pressed body 4,6, until then in the mounted state of the pump 2, the stator shell 16 abuts the connector body 4,6. In this case, the collar 18 is pressed into the frontally open chambers 50 of the stator jacket 16, which leads to a clawing of the collar 18 and thus also to an improved fixation of the elastomeric body 20 in the stator jacket 16.
  • connection body 4, 6 has a recess receiving the collar 18 with a shape corresponding to the collar 18.
  • the depth d of the recess is smaller than the collar thickness s, so that the collar 18, which projects beyond the inner stator shell wall 54, is pressed into the chamber 50.
  • the outer stator shell wall 52 and a part of the partition wall 56 abut against the end face of the connection body 4, 6, whereby a defined force acts on the collar 18, which leads to the penetration of the collar 18 into the open chamber 50 of the stator jacket 16.
  • the eccentric screw pump 2 is designed specifically for an effective and safe operation of the pump, wherein the strator 10 can be easily assembled and disassembled.
  • the stator jacket 16 has cavities 50, recesses and / or elevations that are open at the front on at least one side. This results in a clawing of the collar 18 of the elastomeric body 20, whereby an additional non-positive and positive connection between the collar 18 and stator shell 16 is achieved.

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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)

Abstract

The invention relates to a stator (10) for eccentric screw pumps (2) comprising a stator casing (16) for an elastomeric body (20) for receiving a rotor, which elastomeric body is provided with at least one flange (18), wherein the flange (18) is arranged in a recess between the stator casing (16) and a connecting body (4, 6), wherein the fixing of the elastomeric body (29) in the stator casing should be improved. According to the invention the stator casing (16) has cavities (50), recesses and/or raised areas at least on one face, which are open toward the front.

Description

Geteilter Statormantel Divided stator jacket
Die Erfindung betrifft einen Stator für Exzenterschneckenpumpen mit einem Statormantel für einen mit mindestens einem Bund ver¬ sehenen elastomeren Körper zur Aufnahme eines Rotors, wobei der Bund in einer Ausnehmung zwischen Statormantel und einem Anschlusskörper angeordnet ist. The invention relates to a stator for eccentric screw pumps with a stator casing for a ver ¬ seen with at least one collar elastomeric body for receiving a rotor, wherein the collar is arranged in a recess between the stator casing and a connection body.
Eine Exzenterschneckenpumpe besteht im Wesentlichen aus einem in einem Stator drehbar gelagerten schraubenförmigen Rotor, welcher sich mit seiner Längsachse exzentrisch um die Statorachse dreht. Die dem Rotor zugewandte Seite des Stators weist eine mindestens zweigängige zur Rotorfigur korrespondierende Schraubenform dop¬ pelter Steigung auf. Zwischen dem Rotor und dem Stator entstehen mehrere gleichgroße Kammern in denen das Fördergut, aufgrund der unterschiedlichen Steigungen von Rotor und Stator, in axialer Richtung durch den Stator hindurch bewegt wird. Üblicherweise besteht der Rotor aus einem abriebarmen Material wie beispiels¬ weise Stahl und der Stator aus einem elastischen Material wie beispielsweise Gummi. An eccentric screw pump consists essentially of a rotatably mounted in a stator helical rotor, which rotates eccentrically with its longitudinal axis about the stator axis. The side facing the rotor side of the stator has an at least two-speed corresponding to the rotor figure helical shape dop ¬ Pelter gradient. Between the rotor and the stator arise several equally sized chambers in which the conveyed, due to the different pitches of the rotor and stator, is moved in the axial direction through the stator. Typically, the rotor consists of an abrasion-resistant material such as steel example ¬ and the stator of a resilient material such as rubber.
Der elastomere Körper wird in der Praxis häufig mit einem Mantel versehen, beispielsweise indem der Stator in den Mantel einvulkanisiert wird. Der Stator unterliegt materialbedingt einem ver¬ gleichsweise hohen Verschleiß, weshalb in regelmäßigen Abständen ein Austausch des Stators beziehungsweise Statormantels erfor¬ derlich ist. In der Vergangenheit wurde immer wieder nach Lösungen gesucht, um die für einen Austausch notwendigen Wartungsarbeiten möglichst gering zu halten. The elastomeric body is often provided in practice with a jacket, for example by the stator is vulcanized into the jacket. The stator is subject to due to the material a ver ¬ tively high wear, which is why an exchange of the stator or the stator casing is erfor ¬ sary at regular intervals. In the past, solutions have been sought time and again to minimize the maintenance required for replacement.
Beispielsweise ist in der DE 102 41 753 eine Exzenterschneckenpumpe mit einem Statormantel offenbart, der zur Vereinfachung der Montage und Demontage des elastomeren Körpers, einen Stator¬ mantel aus mehreren miteinander verbundenen, sich in Längsrichtung erstreckenden Segmenten aufweist. Die Längskanten der Segmente sind derart ausgebildet, dass benachbarte Segmente inei- nander greifen, um eine auf Zug belastbare formschlüssige Verbindung herzustellen. Weiterhin sind die Segmente so gestaltet, dass ihre dem elastomeren Körper zugewandte Seite, im Wesentlichen ebene Flächen bilden. Somit ergibt sich durch die Verbindung mehrerer Segmente ein geschlossener Mantel in Polygonform. Diese Polygonform greift in eine entsprechende Polygonform der Außenseite des elastomeren Körpers ein, so dass sich ein Form- schluss zur Übertragung des Drehmoments ergibt und eine Drehbewegung des elastomeren Körpers im Statormantel verhindert wird. In DE 102 41 753 for example is disclosed with a stator casing an eccentric screw pump, the associated order to simplify the assembly and disassembly of the elastomeric body, a stator ¬ coat of a plurality with each other, having longitudinally extending segments. The longitudinal edges of the segments are formed such that adjacent segments inei- grip one another to produce a form-fitting connection that can be loaded on a train. Furthermore, the segments are designed so that their side facing the elastomeric body, form substantially flat surfaces. Thus, the result of the connection of several segments is a closed jacket in polygonal shape. This polygonal shape engages in a corresponding polygonal shape of the outside of the elastomeric body, so that a positive fit results for the transmission of the torque and a rotational movement of the elastomeric body in the stator jacket is prevented.
Es wäre jedoch wünschenswert, einen Stator mit einem Statormantel und einem elastomeren Körper bereit zu stellen, bei dem nicht nur eine Drehbewegung des elastomeren Körpers gehemmt wird. Da während des Pumpenbetriebs, insbesondere durch die Förderbewegung des Rotors, auch radiale und axiale Kräfte auftreten, welche am elastomeren Körper angreifen, sollte die Fixierung des elastomere Körper weiter verbessert werden. Beispielsweise ist aus der WO2011/155312 eine spezielle Ausführungsform bekannt, bei der der elastomere Körper an seinen beiden Enden mit einem Bund versehen ist, wodurch eine effektive Abdichtung der Pumpe erreicht werden soll. Der Bund ist dabei in einer Ausnehmung zwischen Statormantel und einem Anschlusskörper (Anschlussflansch, Pumpengehäuse) angeordnet. Statormantel und elastomerer Körper werden zwischen Anschlussflansch und Pumpengehäuse mittels Gewindestäbe verspannt, der sich einstellende Abstand zwischen Statormantel und Anschlusskörper ist geringer als die Bundstärke, wodurch der Bund gequetscht wird und somit eine abgedichtete Verbindung zwischen Stator und Anschlusskörper entsteht. Zwar wird auf diese Weise der elastomere Körper auch axial fixiert, die radial wirkenden Kräfte im Bundbereich werden jedoch nur durch die gebildete kraftschlüssige Verbindung aufgenommen . Der Erfindung liegt daher die Aufgabe zugrunde, einen Statormantel der eingangs genannten Art anzugeben, der eine verbesserte Fixierung des elastomeren Körpers ermöglicht. However, it would be desirable to provide a stator having a stator jacket and an elastomeric body that does not inhibit only rotational movement of the elastomeric body. Since during pump operation, in particular by the conveying movement of the rotor, also radial and axial forces occur, which act on the elastomeric body, the fixation of the elastomeric body should be further improved. For example, WO2011 / 155312 a special embodiment is known in which the elastomeric body is provided at both ends with a collar, whereby an effective sealing of the pump is to be achieved. The collar is arranged in a recess between the stator jacket and a connection body (connection flange, pump housing). Stator jacket and elastomeric body are clamped between the connecting flange and the pump housing by means of threaded rods, the adjusting distance between stator jacket and connector body is less than the collar thickness, whereby the collar is crushed and thus creates a sealed connection between the stator and connector body. Although in this way the elastomeric body is also axially fixed, the radially acting forces in the waistband area are only absorbed by the formed frictional connection. The invention is therefore based on the object of specifying a stator jacket of the type mentioned, which allows improved fixation of the elastomeric body.
Diese Aufgabe wird mit den Merkmalen gemäß den Ansprüchen 1 bis 11 gelöst. Erfindungsgemäß weist dabei der Statormantel zumindest an einer Seite stirnseitig offene Hohlräume, Ausnehmungen und/oder Erhebungen auf . This object is achieved with the features according to claims 1 to 11. According to the invention, the stator jacket has cavities, recesses and / or elevations which are open on the face side, at least on one side.
Die Erfindung geht dabei von der Überlegung aus, dass die Fixierung des elastomeren Körpers im Statormantel verbessert werden kann, indem der elastomere Körper an mindestens einem Ende, durch eine zusätzlich wirkenden Verbindung, zwischen Statormantel und Anschlusskörper fixiert ist. Die Verbindung sollte auch radial wirkende Kräfte im Bundbereich aufnehmen können und es sollte eine lösbare Verbindung sein. The invention is based on the consideration that the fixation of the elastomeric body in the stator jacket can be improved by the elastomeric body is fixed at least one end, by an additionally acting connection, between the stator jacket and connector body. The connection should also be able to absorb radially acting forces in the waistband and it should be a detachable connection.
Dies wird dadurch erreicht, dass der Statormantel in seiner dem Bund zugewandten Stirnseite offene Hohlräume und/oder Ausnehmungen aufweist. Wird nun der Bund gegen den Statormantel gepresst, verkrallt sich der Bund stirnseitig im Statormantel derart, dass der Bund aufgrund seiner elastomeren Eigenschaften in die offenen Hohlräume oder Ausnehmungen hineinragt. Zwischen dem Statormantel und dem Bund entsteht eine kraft und formschlüssige Verbindung, welche auch radial wirkende Kräfte aufnehmen kann. Denkbar ist auch, den Bund mit einer zur Form der offenen Hohlräume, Ausnehmungen oder Erhebungen korrespondierenden Aussackungen oder Vertiefungen zu versehen. Einerseits ist dadurch die Bildung einer formschlüssigen Verbindung auch mit einem relativ geringen Anpressdruck möglich und andererseits kann eine besonders einfache Positionierung bezüglich der Öffnung für die Rotoraufnahme erreicht werden, indem sich der elastomere Körper nur in einer bestimmten Drehposition in den Statormantel einsetzen lässt. Zur Herstellung der erfindungsgemäßen Verbindung weist der Anschlusskörper eine den Bund aufnehmende Ausnehmung auf. Der Bund ragt dabei in Längsrichtung über die statorseitige Stirnseite des Anschlussblocks hinaus, so dass beim Anpressen des Statormantels gegen den Bund, der Bund gequetscht wird und in die stirnseitigen Öffnungen im Statormantel eindringt. Um einen definierten Druck einzustellen, weist der Statormantel einen festgelegten größeren Außendurchmesser als die Ausnehmung im Anschlussblock auf. Der äußere Statormantel und der Anschlussblocks bilden dabei stirnseitig einen Anschlag. Der Anpressdruck kann somit beispielsweise unter Verwendung ein und desselben Anschlussblocks, durch eine geeignet gewählte Bundstärke eingestellt werden. This is achieved in that the stator jacket has open cavities and / or recesses in its end facing the collar. Now, if the collar is pressed against the stator jacket, the collar digs into the front side of the stator shell in such a way that the collar protrudes into the open cavities or recesses due to its elastomeric properties. Between the stator jacket and the collar creates a positive and positive connection, which can also absorb radial forces. It is also conceivable to provide the federal government with a corresponding to the shape of the open cavities, recesses or elevations Ausackungen or depressions. On the one hand, the formation of a positive connection is possible with a relatively low contact pressure and on the other hand, a particularly simple positioning with respect to the opening for the rotor receiving can be achieved by the elastomeric body can be used only in a certain rotational position in the stator jacket. To produce the compound according to the invention, the connection body has a recess receiving the collar. The collar protrudes in the longitudinal direction beyond the stator end side of the terminal block, so that when pressing the stator shell against the federal government, the federal government is squeezed and penetrates into the frontal openings in the stator jacket. In order to set a defined pressure, the stator jacket has a fixed larger outer diameter than the recess in the connection block. The outer stator shell and the terminal block form the end face a stop. The contact pressure can thus be adjusted, for example, using one and the same terminal block, by a suitably selected waistband strength.
Um zu erreichen, dass der Bund nach der Montage der Pumpe gegen die Stirnseite des Statormantels gepresst wird, sollte der Abstand zwischen Statormantel und Anschlusskörper geringer sein als die Bundstärke. Vorzugsweise ist dabei für die Ausnehmung im Anschlusskörper eine zum Bund korrespondierende Form zu wählen. Dadurch kann der Bund nur in Richtung des Statormantels ausweichen, wodurch eine besonders effektive Verkrallung des Bundes im Statormantel erzielt wird. In order to achieve that the collar is pressed against the end face of the stator jacket after mounting the pump, the distance between the stator jacket and the connector body should be less than the collar thickness. Preferably, a shape corresponding to the collar is to be selected for the recess in the connection body. As a result, the collar can only escape in the direction of the stator jacket, whereby a particularly effective clawing of the collar in the stator jacket is achieved.
Um zum erfindungsgemäßen Stator zu gelangen ist jede Art von offenen Hohlräumen, Ausnehmungen oder Erhebungen im Stator denkbar, welche geeignet ist, eine stirnseitig formschlüssige Verbindung zwischen Statormantel und Anschlusskörper herzustellen. Beispielsweise kann eine einfache Struktur ausreichend sein, sofern sich der Bund in den durch die Struktur gebildeten Zwischenräumen/Erhebungen verkrallen kann. Selbstverständlich kann für sich genommen oder ergänzend auch der Anschlusskörper stirnseitig mit offene Hohlräume, Ausnehmungen und/oder Erhebungen versehen sein. Bevorzugt ist der Stator als Profilkörper ausgebildet, wodurch stirnseitig offene Hohlräume für den Bund gebildet werden. Eine derartige Ausgestaltung hätte zudem den Vorteil, dass der Statormantel trotz Materialeinsparung eine ausreichend hohe Festigkeit und Steifigkeit aufweisen würde. In order to arrive at the stator according to the invention, any type of open cavities, recesses or elevations in the stator is conceivable, which is suitable for producing a front-side positive connection between the stator casing and the connection body. For example, a simple structure may suffice if the federal government can dig into the interstices / elevations formed by the structure. Of course, taken alone or in addition, the connection body may be provided on the front side with open cavities, recesses and / or elevations. Preferably, the stator is formed as a profile body, whereby the frontally open cavities are formed for the federal government. Such a design would also have the advantage that the stator jacket despite material savings would have a sufficiently high strength and rigidity.
In einer besonders bevorzugten Ausgestaltung weist der Statormantel ein Kammerprofil auf. Die Kammern können dabei durch eine den elastomeren Körper umgebenen inneren Statormantelwand, eine äußere Statormantelwand und dazwischen liegenden Trennwänden gebildet sein. Beispielsweise verlaufen die Trennwände in Längsrichtung des Statormantels, so dass stirnseitig offene durch die Kammerstruktur gebildete Hohlräume entstehen. Nach der Montage des Stators verkrallt sich der Bund des elastomeren Körpers durch dessen Eindringen in die Kammern aufgrund des Anpress- drucks gegen den Statormantel . Der Außendurchmesser des Bundes ist dabei so groß zu wählen, dass der Bund die stirnseitig offenen Kammern zumindest teilweise überdeckt, indem die Wandstärke der inneren Statormantelwand geringer ist als die Bundhöhe. In a particularly preferred embodiment, the stator jacket has a chamber profile. The chambers may be formed by an inner stator shell wall surrounding the elastomeric body, an outer stator shell wall and partitions located therebetween. For example, the partitions extend in the longitudinal direction of the stator shell, so that open-sided cavities formed by the chamber structure arise. After assembly of the stator, the collar of the elastomeric body digs against the stator jacket due to its penetration into the chambers due to the contact pressure. The outer diameter of the collar is to be chosen so large that the collar covers the frontally open chambers at least partially by the wall thickness of the inner stator shell wall is less than the waist height.
Gemäß einer bevorzugten Weiterbildung ist der Statormantel als längsgeteilter Statormantel aus zumindest zwei Teilschalen gebildet. Dadurch wird eine besonders einfache Montage erreicht, denn durch die längsgeteilte Bauweise des Statormantels kann besonders einfach der Austausch des elastomeren Körpers erfolgen. Zu diesem Zweck sind die Teilschalen lösbar miteinander verbunden . According to a preferred development, the stator jacket is formed as a longitudinally divided stator jacket comprising at least two partial shells. As a result, a particularly simple installation is achieved, because the longitudinally divided construction of the stator jacket makes it particularly easy to replace the elastomeric body. For this purpose, the partial shells are detachably connected to each other.
Beispielsweise sind die Teilschalen einerseits mittels einer formschlüssigen Verbindung und andererseits mittels einer Verschlusseinheit miteinander verbunden. Als besonders geeignete formschlüssige Verbindung hat sich eine Ausführungsform erwiesen, bei der ein auskragendes Halteelement einer Teilschale hakenartig in eine Vertiefung einer benachbarten Teilschale eingreift. Nach dem Öffnen der Verschlusseinheit kann der Stator- mantel um die formschlüssige Verbindung herum aufgeklappt werden und die Teilschalen können so einfach vom elastomeren Körper herunter genommen werden. For example, the partial shells are connected to each other by means of a positive connection and on the other hand by means of a closure unit. As a particularly suitable positive connection, an embodiment has been found in which a cantilevered holding element of a partial shell hook-like engages in a recess of an adjacent partial shell. After opening the closure unit, the stator be folded around the positive connection around and the partial shells can be easily taken down from the elastomeric body.
Besonders bevorzugt ist die Verschlusseinheit als Schnellver- schluss, insbesondere als eine Art Schraub- und Klappverschluss ausgebildet. Mit Hilfe des Klappverschlusses können die Teilschalen miteinander verbunden und damit der Statormantel geschlossen werden. Die zusätzliche Schraubverbindung dient insbesondere dazu, einen Spalt zwischen den Teilschalen zu schließen. Particularly preferably, the closure unit is designed as a quick release, in particular as a kind of screw and flap closure. With the help of the snap closure, the partial shells can be connected to each other and thus the stator jacket can be closed. The additional screw is used in particular to close a gap between the partial shells.
Die Verschlusseinheit kann zudem mit einer Verliersicherung ausgestattet sein, um zu verhindern, dass sich Verschlusselemente vom Statormantel lösen. In der Verschlusseinheit kann weiter eine Aufnahme für ein Sensorkabel vorgesehen sein. Vorzugsweise ist die Aufnahme dabei als Kabelkanal ausgebildet und so positioniert, dass der Kabelkanal beim Öffner der Verschlusseinheit das Sensorkabel freigibt . Bei einer Demontage des Stators kann so auf eine besonders einfache Art und Weise der Sensor samt Sensorkabel entfernt und die Teilschalen entnommen werden. The closure unit can also be equipped with a captive safety device to prevent closure elements from coming loose from the stator jacket. In the closure unit, a receptacle for a sensor cable can also be provided. Preferably, the receptacle is designed as a cable channel and positioned so that the cable channel releases the sensor cable in the opener of the closure unit. In a disassembly of the stator can be removed in a particularly simple manner, the sensor, including sensor cable and the partial shells are removed.
Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass bei einem Stator mit einem austauschbaren elastomeren Körper, der elastomere Körper sicher im Statormantel fixiert ist. Insbesondere wird einer durch die Rotorbewegung verursachten möglichen Bewegung des elastomeren Körpers effektiv entgegengewirkt . The advantages achieved by the invention are in particular that in a stator with an exchangeable elastomeric body, the elastomeric body is securely fixed in the stator jacket. In particular, a possible movement of the elastomeric body caused by the rotor movement is effectively counteracted.
Ausführungsformen der vorliegenden Erfindung werden in exemplarischer Weise anhand von schematischen Zeichnungen näher erläutert. Darin zeigen: Embodiments of the present invention will be described in more detail by way of example with reference to schematic drawings. Show:
Fig. 1 den vorderen Abschnitt einer Exzenterschneckenpumpe mit einem zwischen Anschlusskörpern verspannten Stator, Fig. 2 einen Querschnitt des in Fig. 1 gezeigten zweiteiligen Stators, 1 shows the front portion of a progressing cavity pump with a stator clamped between connection bodies, FIG. 2 shows a cross section of the two-part stator shown in FIG. 1, FIG.
Fig. 3,4,5 verschiedene Ausführungsformen der Verschlusseinheit , FIGS. 3, 4, 5 show various embodiments of the closure unit,
Fig . 6 den an beiden Enden mit einem Bund versehene elastomere Körper, welcher eine polygonförmige Außenseite aufweist, Fig. 6 the elastomeric body provided with a collar at both ends, which has a polygonal outer side,
Fig. 7 einen vergrößert gezeigten Ausschnitt des verspannten Stators im Bereich der Stator-7 shows an enlarged detail of the strained stator in the region of the stator
Anschlusskörper-Verbindung, einer längs ge schnittenen Darstellung. Connection body connection, a longitudinal ge cut representation.
Gleiche Teile sind in allen Figuren mit denselben Bezugszeichen versehen . Identical parts are provided with the same reference numerals in all figures.
In Fig. 1 ist ein vorderer Abschnitt einer Exzenterschneckenpumpe 2 mit einem zwischen den Anschlusskörpern Pumpengehäuse 4 und Anschlussflansch 6 mittels Gewindestangen 8 verspannten Stator 10 dargestellt. Der Stator 10 umfasst einen längsgeteilten aus zwei Teilschalen 12,14 bestehenden Statormantel 16 für einen mit mindestens einem Bund 18 versehenen elastomeren Körper 20 zur Aufnahme eines Rotors. Der Statormantel 16 ist aus einer Aluminiumlegierung gefertigt. In Fig. 1, a front portion of an eccentric screw 2 is shown with a clamped between the connecting bodies pump housing 4 and flange 6 by means of threaded rods 8 stator 10. The stator 10 comprises a longitudinally divided stator shell 16 consisting of two partial shells 12, 14 for a elastomeric body 20 provided with at least one collar 18 for receiving a rotor. The stator shell 16 is made of an aluminum alloy.
Die Exzenterschneckenpumpe 2 ist mit zwei Standfüßen 22 zur Montage der Pumpe 2 an einem dafür vorgesehenen Pumpenplatz versehen. Mit Hilfe der Gewindestangen 8, durch das Anziehen der Gewindemuttern 24, wird der Bund 18 soweit zwischen Statormantel 16 und Anschlusskörper 4,6 verspannt, bis der Statormantel 16 am Anschlusskörper 4,6 anschlägt. Die beiden Teilschalen 12,14 sind einerseits mittels einer formschlüssigen Verbindung 26 und ande- rerseits mittels einer Verschlusseinheit 28 miteinander verbunden. Die Verschlusseinheit 28 befindet sich unter einer Schutzabdeckung 30. The eccentric screw 2 is provided with two feet 22 for mounting the pump 2 at a designated pumping station. With the help of the threaded rods 8, by tightening the threaded nuts 24, the collar 18 is clamped so far between the stator shell 16 and connector body 4,6 until the stator shell 16 abuts the connector body 4,6. The two partial shells 12,14 are on the one hand by means of a positive connection 26 and other- on the other hand by means of a closure unit 28 connected to each other. The closure unit 28 is located under a protective cover 30.
Einen Querschnitt des in Fig. 1 gezeigten zweiteiligen Stators 10 ist in Fig. 2 dargestellt. Der Stator 10 weist eine polygon- förmige Innenseite auf und umfasst eine obere Teilschale 12 und eine untere Teilschale 14, welche einerseits über die gesamte Statormantellänge mittels einer formschlüssigen Verbindung 26 und andererseits mittels einer gegenüberliegenden, über die gesamte Statormantellänge wirkenden, Verschlusseinheit 28 miteinander verbunden sind. Die formschlüssige Verbindung 26 ist dabei durch ein an einem Ende der oberen Teilschale 12 angeformten hakenartigen Halteelement 32 gebildet, das in eine am gegenüberliegenden Ende der unteren Halbschale 14 eingebrachten Vertiefung 34 eingreift. Der formschlüssigen Verbindung 26 gegenüberliegend ist die Verschlusseinheit 28 angeordnet, welche eine Art Schraub- und Klap Verbindung 36 darstellt. Auf dieser Seite des Stators 10 verlaufen die Enden der Teilschalen 12,14 radial nach Außen und sind mit Bohrungen für eine von oben eingebrachte Befestigungsschraube 38 versehen, welche in eine mit einem Innengewinde versehenen Gelenkstange 40 eingeschraubt ist. Zwischen Schraubenkopf und oberer Teilschale 12 ist eine mit Durchgangsbohrungen versehene Zwischenplatte 42 angeordnet, die insbesondere der Verteilung der beim Verschrauben wirkenden Kräfte dient . A cross section of the two-part stator 10 shown in FIG. 1 is shown in FIG. 2. The stator 10 has a polygonal inner side and comprises an upper partial shell 12 and a lower partial shell 14, which are connected to one another over the entire stator shell length by means of a positive connection 26 and on the other hand by means of an opposite closure unit 28 acting over the entire stator shell length , The positive connection 26 is formed by an integrally formed at one end of the upper part shell 12 hook-like holding element 32 which engages in a recess 34 introduced at the opposite end of the lower half-shell 14. The positive connection 26 opposite the closure unit 28 is arranged, which represents a kind of screw and Klap connection 36. On this side of the stator 10, the ends of the partial shells 12,14 extend radially outward and are provided with holes for a introduced from above mounting screw 38 which is screwed into a provided with an internal threaded joint rod 40. Between screw head and upper part shell 12 is provided with through holes intermediate plate 42 is arranged, which serves in particular the distribution of forces acting during screwing.
Stirnseitig der radial verlaufenden Enden der Teilschalen 12,14 ist in beiden Teilschalen 12,14 eine Ausnehmung eingebracht, welche ein Kabelkanal 44 für einen Sensor bilden. Dieser Kabel - kanal 44 öffnet sich aufgrund der speziellen Anordnung bei der Demontage der Teilschalen 12,14. Die Demontage erfolgt im Wesentlichen dadurch, dass die Befestigungsschraube 38 soweit gelockert wird, dass sich diese zusammen mit der Zwischenplatte 42 um die Drehachse 46 der Gelenkstange 40 vom Stator 10 weg klap- pen lässt. Die Verschlusseinheit 28 ist somit geöffnet und die Teilschalen 12,14 lassen sich um die formschlüssige Verbindung 26 herum aufklappen und entnehmen. Die Montage der Teilschalen 12,14 erfolgt analog in umgekehrter Reihenfolge. On the front side of the radially extending ends of the partial shells 12, 14, a recess is made in both partial shells 12, 14, which form a cable duct 44 for a sensor. This cable channel 44 opens due to the special arrangement during disassembly of the partial shells 12,14. The disassembly is carried out essentially by the fact that the fastening screw 38 is loosened so far that they fold together with the intermediate plate 42 about the axis of rotation 46 of the articulated rod 40 from the stator 10 away. pen leaves. The closure unit 28 is thus opened and the partial shells 12, 14 can be opened and removed around the positive connection 26. The assembly of the partial shells 12,14 is carried out analogously in reverse order.
Die Teilschalen 12,14 sind durch mehrere derartige Schraub- und Klappverbindungen 36 miteinander verbunden. Die Befestigungsschrauben 38 lassen sich aber in einem Arbeitsgang vom Stator 10 wegklappen, da diese durch die Gelenkstange 40 und die Zwischenplatte 42 miteinander gekoppelt sind. Damit nach dem Herausklappen die Verschlusselemente nicht aus der in die untere Teilschale 14 eingebrachten Aufnahme herausfallen können, ist eine als radial verlaufender Steg ausgebildete Verliersicherung 48 unterhalb der Gelenkstange 40 angeordnet. Um die Verschlusseinheit 28 vor Verschmutzung zu schützen, ist die mittels Schnappverschlüsse am Stator 10 angebrachte Schutzabdeckung 30 vorgesehen. The partial shells 12,14 are interconnected by a plurality of such screw and hinged connections 36. However, the fastening screws 38 can be folded away from the stator 10 in one operation since they are coupled together by the articulated rod 40 and the intermediate plate 42. Thus, after folding out the closure elements can not fall out of the introduced into the lower part of shell 14 recording, designed as a radially extending web loss prevention device 48 is disposed below the pivot rod 40. In order to protect the closure unit 28 from contamination, the protective cover 30 attached by means of snap fasteners to the stator 10 is provided.
Wie aus Fig. 2 weiterhin ersichtlich, weist der Stator 10 ein Kammerprofil auf. Die Kammern 50 sind gebildet durch eine äußere Statormantelwand 52, eine innere Statormantelwand 54 und dazwischen längs des Stators 10 verlaufenden Trennwände 56. Die Kammern 50 stellen dabei erfindungsgemäß offene Hohlräume dar, in denen sich der Bund 18 des elastomeren Körpers 20 verkrallen kann . As can also be seen from FIG. 2, the stator 10 has a chamber profile. The chambers 50 are formed by an outer stator shell wall 52, an inner stator shell wall 54 and between them along the stator 10 extending partitions 56. The chambers 50 according to the invention are open cavities in which the collar 18 of the elastomeric body 20 can dig.
Die Fig. 3,4 und 5 zeigen verschiedene Ausführungsformen der Verschlusseinheit. So ist in Fig. 3 eine Verschlusseinheit dargestellt, bei der eine Verschraubung des Statormantels 16 mittels Klemmleisten 60 erfolgt, die in den Statormantel 16 eingeschoben werden können. Als Verliersicherung für Befestigungsschrauben 62 dient bei dieser Ausführungsform eine im Vergleich zum Schraubenkopf kleinere Öffnung in der oberen Teilschale 12, so dass die Schraube 62 über die hier nicht dargestellte Öffnung nur soweit rausgeschraubt werden kann, wie das innerhalb des Statormantels 16 möglich ist, nämlich bis der Schraubenkopf an der Innenseite der oberen Teilschale 12 anstößt. Dabei befindet sich ein Teil der Befestigungsschraube 62 immer noch innerhalb der Klemmleiste 60, so dass die Schraube 62 nicht ins Profilinnere fällt. FIGS. 3, 4 and 5 show various embodiments of the closure unit. Thus, a closure unit is shown in Fig. 3, in which a screwing of the stator shell 16 by means of terminal strips 60 takes place, which can be inserted into the stator shell 16. As a captive for fastening screws 62 is used in this embodiment a smaller compared to the screw head opening in the upper part shell 12, so that the screw 62 can be unscrewed through the opening, not shown here only as far as that is possible within the stator shell 16, namely to the screw head the inside of the upper part shell 12 abuts. In this case, a part of the fastening screw 62 is still within the terminal block 60, so that the screw 62 does not fall into the profile interior.
In Fig. 4 ist eine Verschlusseinheit 28 dargestellt, bei der ein Verschluss der Teilschalen 12,14 über eine Schließleiste 64 erfolgt, welche mittels einer Befestigungsschraube 66 und eine in die obere Teilschale 12 integrierte Gewindemutter 68 an den Statormantel 16 herangezogen wird und wodurch die beiden Teil- schalen 12,14 aufgrund der konisch verlaufenden Kontaktflächen 70 geschlossen werden. In Fig. 4, a closure unit 28 is shown, in which a closure of the partial shells 12,14 via a closing bar 64 which is used by means of a fastening screw 66 and an integrated into the upper part shell 12 threaded nut 68 to the stator shell 16 and whereby the two Partial shells 12,14 are closed due to the conical contact surfaces 70.
Eine Verschlusseinheit 28 mit Druckschrauben 72 ist in Fig. 5 dargestellt. Dabei dient als Schließleiste eine zu einem U- Profil geformte Leiste 74, welche mit einem Innengewinde für die Druckschraube 72 versehen ist. Zur Verteilung der Druckkraft ist eine Stahlleiste 76 als Zwischenplatte in die obere Teilschale 12,14 eingeschoben. Zur Aufnahme der Stahlleiste 76 und Führung der U-Profil-Leiste 74 sind beide Teilschalen mit einer längsverlaufenden nutförmigen Ausnehmung 78 versehen. A closure unit 28 with pressure screws 72 is shown in FIG. It serves as a closing strip to a U-shaped profile strip 74, which is provided with an internal thread for the pressure screw 72. To distribute the compressive force, a steel strip 76 is inserted as an intermediate plate in the upper part shell 12,14. To accommodate the steel strip 76 and guide the U-profile strip 74, both partial shells are provided with a longitudinal groove-shaped recess 78.
Fig. 6 zeigt den an beiden Enden mit einem Bund 18 versehene elastomere Körper 20 aus einem gummiartigen Material, welcher eine polygonförmige Außenseite aufweist, in einer zusätzlich quer- und längsgeschnittenen Ansicht. Der Bund 18 hat eine Bundstärke s und eine Bundhöhe hlf h2. Der elastomere Körper 20 weist zur Aufnahme des Rotors eine zweigängige schraubenförmige Ausnehmung 80 auf. 6 shows the elastomeric body 20, which is provided at both ends with a collar 18, of a rubber-like material which has a polygonal outer side, in an additionally transversely and longitudinally sectioned view. The collar 18 has a waistband s and a waist height h lf h 2 . The elastomeric body 20 has a two-flighted helical recess 80 for receiving the rotor.
Bei der Montage der Exzenterschneckenpumpe 2 ragt der Bund 18 vorerst aus dem Anschlusskörper 4,6 heraus, da die Bundstärke s größer ist als die Tiefe d der Ausnehmung im Anschlusskörper 4,6. Erst nach dem Verspannen des Stators 10 zwischen den Anschlusskörpern 4,6 wird der Bund in die Ausnehmung im Anschluss- körper 4,6 gepresst, bis dann im montierten Zustand der Pumpe 2, der Statormantel 16 am Anschlusskörper 4,6 anschlägt. Dabei wird der Bund 18 in die stirnseitig offenen Kammern 50 des Statormantels 16 gedrückt, was zu einer Verkrallung des Bundes 18 und damit auch zu einer verbesserten Fixierung des elastomeren Körpers 20 im Statormantel 16 führt. During assembly of the eccentric screw pump 2, the collar 18 initially projects out of the connection body 4, 6, since the collar thickness s is greater than the depth d of the recess in the connection body 4, 6. Only after the stator 10 is clamped between the connection bodies 4, 6 is the collar inserted into the recess in the connection pressed body 4,6, until then in the mounted state of the pump 2, the stator shell 16 abuts the connector body 4,6. In this case, the collar 18 is pressed into the frontally open chambers 50 of the stator jacket 16, which leads to a clawing of the collar 18 and thus also to an improved fixation of the elastomeric body 20 in the stator jacket 16.
Aufgrund der polygonförmigen Querschnittsform des elastomeren Körpers 20, ergeben sich über dessen Umfang unterschiedliche Bundhöhen mit h2 < h2. Eine effektive Verkrallung im Statormantel 16 wird erreicht, indem der Bund 18 eine Höhe hi aufweist, die größer ist als die Wanddicke der innere Statormantelwand 54. Um zu der erfindungsgemäßen verbesserten Fixierung des elastomeren Körpers 20 zu gelangen, ist zumindest eine Bundhöhe h2 wählen, die größer ist als die Wanddicke der inneren Statormantelwand 54. Die größere Bundhöhe h1,h2 at zum Ziel, dass der Bund 18 über die innere Statormantelwand 54 radial hinausragt, wodurch sich der Bund 18 an der inneren Statormantelwand 54 festkrallt. Die Trennwände 56 im Statormantel 16 führen dabei analog zu einer zusätzlichen Fixierung des Bundes 18, die einer Drehbewegung des Bundes 18 entgegenwirkt. Due to the polygonal cross-sectional shape of the elastomeric body 20, arise over the circumference different waist heights with h 2 <h 2 . An effective clawing in the stator jacket 16 is achieved by the collar 18 having a height hi which is greater than the wall thickness of the inner stator shell wall 54. In order to achieve the improved fixation of the elastomeric body 20 according to the invention, at least one collar height h 2 must be selected, which is greater than the wall thickness of the inner stator shell wall 54. The larger collar height h 1 , h 2 at the goal that the collar 18 extends beyond the inner Statormantelwand 54 radially, whereby the collar 18 clings to the inner stator shell wall 54. The partitions 56 in the stator shell 16 lead analogously to an additional fixation of the collar 18, which counteracts a rotational movement of the collar 18.
Einen vergrößert dargestellten Ausschnitt des verspannten Stators 10 im Bereich der Stator-Anschlusskörper-Verbindung, in einer längs geschnittenen Darstellung, zeigt Fig. 7. Der Anschlusskörper 4,6 weist dabei eine den Bund 18 aufnehmende Ausnehmung mit einer zum Bund 18 korrespondierende Form auf. Die Tiefe d der Ausnehmung ist dabei geringen als die Bundstärke s, so dass der Bund 18, der über die innere Statormantelwand 54 hinausragt, in die Kammer 50 hineingepresst wird. Die äußere Statormantelwand 52 und ein Teil der Trennwand 56 schlagen an der Stirnseite des Anschlusskörpers 4,6 an, wodurch eine definierte Kraft auf den Bund 18 wirkt, die zum Eindringen des Bundes 18 in die offene Kammer 50 des Statormantels 16 führt. Die Exzenterschneckenpumpe 2 ist spezifisch auf einen effektiven und sicheren Betrieb der Pumpe ausgelegt, wobei der Strator 10 einfach montiert und demontiert werden kann. Um den elastomeren Körper 20 im Statormantel 16 besonders sicher fixieren zu können, weist der Statormantel 16 zumindest an einer Seite stirnseitig offene Hohlräume 50, Ausnehmungen und/oder Erhebungen auf. Dadurch kommt es zu eine Verkrallung des Bundes 18 des elastomeren Körpers 20, wodurch eine zusätzliche kraft- und formschlüssigen Verbindung zwischen Bund 18 und Statormantel 16 erreicht wird. An enlarged detail of the strained stator 10 in the region of the stator-connection body connection, in a longitudinal section, is shown in FIG. 7. In this case, the connection body 4, 6 has a recess receiving the collar 18 with a shape corresponding to the collar 18. The depth d of the recess is smaller than the collar thickness s, so that the collar 18, which projects beyond the inner stator shell wall 54, is pressed into the chamber 50. The outer stator shell wall 52 and a part of the partition wall 56 abut against the end face of the connection body 4, 6, whereby a defined force acts on the collar 18, which leads to the penetration of the collar 18 into the open chamber 50 of the stator jacket 16. The eccentric screw pump 2 is designed specifically for an effective and safe operation of the pump, wherein the strator 10 can be easily assembled and disassembled. In order to be able to fix the elastomeric body 20 in the stator jacket 16 in a particularly secure manner, the stator jacket 16 has cavities 50, recesses and / or elevations that are open at the front on at least one side. This results in a clawing of the collar 18 of the elastomeric body 20, whereby an additional non-positive and positive connection between the collar 18 and stator shell 16 is achieved.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
2 Exzenterschneckenpumpe 2 eccentric screw pump
4 Pumpengehäuse  4 pump housings
6 Anschlussflansch  6 connection flange
8 Gewindestange  8 threaded rod
10 Stator  10 stators
12 obere Teilschale  12 upper part shell
14 untere Teilschale  14 lower part shell
16 Statormantel  16 stator jacket
18 Bund  18 fret
20 elastomerer Körper  20 elastomeric body
22 Standfuß  22 base
24 Gewindemutter  24 threaded nut
26 formschlüssige Verbindung  26 positive connection
28 Verschlusseinheit 28 closure unit
30 Schutzabdeckung  30 protective cover
32 Halteelement 32 retaining element
34 Vertiefung  34 deepening
36 Schraub- und Klap Verbindung  36 screw and Klap connection
38 Befestigungsschraube  38 fixing screw
40 Gelenkstange  40 articulated rod
42 Zwischenplatte  42 intermediate plate
44 Kabelkanal  44 cable channel
46 Drehachse  46 axis of rotation
48 Verliersicherung  48 captive
50 Kammer  50 chamber
52 äußere Statormantelwand  52 outer stator shell wall
54 innere Statormantelwand  54 inner stator shell wall
56 Trennwand  56 partition
60 Klemmleiste  60 terminal strip
62 Befestigungsschraube (Klemmleiste) 62 fixing screw (terminal strip)
64 Schließleiste 64 closing bar
66 Befestigungsschraube (Schließleiste) 66 fixing screw (closing strip)
68 Gewindemutter Kontaktfläche Druckschraube U-Profil-Leiste Stahlleiste Ausnehmung 68 threaded nut Contact surface Pressure screw U-profile strip Steel strip recess

Claims

Patentansprüche claims
1. Stator (10) für Exzenterschneckenpumpen (2) mit einem Stator¬ mantel (16) für einen mit mindestens einem Bund (18) versehenen elastomeren Körper (20) zur Aufnahme eines Rotors, wobei der Bund (18) in einer Ausnehmung zwischen Statormantel (16) und ei¬ nem Anschlusskörper (4,6) angeordnet ist, dadurch gekennzeich¬ net, dass der Statormantel (16) zumindest an einer Seite stirn¬ seitig offene Hohlräume (50), Ausnehmungen und/oder Erhebungen aufweist . 1. Stator (10) for eccentric screw pumps (2) with a stator ¬ coat (16) for a at least one collar (18) provided elastomeric body (20) for receiving a rotor, wherein the collar (18) in a recess between the stator jacket (16) and egg ¬ nem connection body (4,6) is arranged, characterized gekennzeich ¬ net, that the stator jacket (16) at least on one side frontally ¬ open cavities (50), recesses and / or elevations.
2. Stator (10) nach Anspruch 1, dadurch gekennzeichnet, dass der Abstand zwischen Statormantel (16) und Anschlusskörper (4,6) ge¬ ringer ist als die Bundstärke (s) . 2. stator (10) according to claim 1, characterized in that the distance between the stator jacket (16) and connecting body (4,6) is ge ¬ ringer than the waistband strength (s).
3. Stator (10) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Statormantel (16) als Profilkörper ausgebildet ist. 3. stator (10) according to claim 1 or 2, characterized in that the stator jacket (16) is designed as a profile body.
4. Stator (10) nach Anspruch 3, dadurch gekennzeichnet, dass der Statormantel (16) ein Kammerprofil aufweist. 4. stator (10) according to claim 3, characterized in that the stator jacket (16) has a chamber profile.
5. Stator (10) nach Anspruch 4, dadurch gekennzeichnet, dass die die Wandstärke der Kammern (50) geringer ist als die Bundstärke (s) . 5. stator (10) according to claim 4, characterized in that the wall thickness of the chambers (50) is less than the waistband strength (s).
6. Stator (10) nach Anspruch 1 bis 5, dadurch gekennzeichnet, dass der Stator (10) mehrteilig ausgebildet ist. 6. stator (10) according to claim 1 to 5, characterized in that the stator (10) is formed in several parts.
7. Stator (10) nach Anspruch 6, dadurch gekennzeichnet, dass der Statormantel (16) als längsgeteilter Statormantel (16) aus zu¬ mindest zwei Teilschalen (12,14) gebildet ist. 7. stator (10) according to claim 6, characterized in that the stator jacket (16) as a longitudinally divided stator jacket (16) from ¬ at least two partial shells (12,14) is formed.
8. Stator (10) nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Teilschalen (12,14) lösbar miteinander verbunden sind. 8. stator (10) according to claim 6 or 7, characterized in that the partial shells (12,14) are detachably connected together.
9. Stator (10) nach Anspruch 8, dadurch gekennzeichnet, dass die Teilschalen (12,14) einerseits mittels einer formschlüssigen Verbindung (26) und andererseits mittels einer Verschlusseinheit (28) miteinander verbunden sind. 9. stator (10) according to claim 8, characterized in that the partial shells (12,14) on the one hand by means of a positive connection (26) and on the other hand by means of a closure unit (28) are interconnected.
10. Stator (10) nach Anspruch 9, dadurch gekennzeichnet, dass die Verschlusseinheit (28) als Schnellverschluss ausgebildet ist . 10. stator (10) according to claim 9, characterized in that the closure unit (28) is designed as a quick release.
11. Stator (10) nach Anspruch 10, dadurch gekennzeichnet, dass der Schnellverschluss (28) als eine Art Schraub- und Klappver- schluss ausgebildet ist. 11. stator (10) according to claim 10, characterized in that the quick release (28) is designed as a kind of screw and Klappver.
12. Statormantel (16) für einen Stator (10) nach einem der An¬ sprüche 1 bis 11. 12, stator casing (16) for a stator (10) according to any one of claims ¬ 1 to 11.
EP13734956.9A 2012-05-05 2013-05-02 Divided stator casing Withdrawn EP3827171A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012008761.6A DE102012008761B4 (en) 2012-05-05 2012-05-05 Divided stator jacket
PCT/DE2013/100163 WO2013167120A2 (en) 2012-05-05 2013-05-02 Divided stator casing

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Publication Number Publication Date
EP3827171A2 true EP3827171A2 (en) 2021-06-02

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ID=48771246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13734956.9A Withdrawn EP3827171A2 (en) 2012-05-05 2013-05-02 Divided stator casing

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US (1) US9719506B2 (en)
EP (1) EP3827171A2 (en)
JP (1) JP6154889B2 (en)
KR (1) KR20150006047A (en)
CN (1) CN104285062B (en)
AR (1) AR090933A1 (en)
AU (1) AU2013258501B2 (en)
BR (1) BR112014027525B1 (en)
DE (1) DE102012008761B4 (en)
RU (1) RU2597272C2 (en)
WO (1) WO2013167120A2 (en)
ZA (1) ZA201407900B (en)

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ZA201407900B (en) 2016-05-25
WO2013167120A2 (en) 2013-11-14
CN104285062A (en) 2015-01-14
DE102012008761A1 (en) 2015-08-13
US20150086350A1 (en) 2015-03-26
US9719506B2 (en) 2017-08-01
AR090933A1 (en) 2014-12-17
BR112014027525A2 (en) 2017-08-22
KR20150006047A (en) 2015-01-15
AU2013258501B2 (en) 2016-12-22
BR112014027525B1 (en) 2021-11-30
JP2015516038A (en) 2015-06-04
AU2013258501A1 (en) 2014-11-27
WO2013167120A3 (en) 2014-05-22
RU2014148907A (en) 2016-06-27
CN104285062B (en) 2017-03-08
RU2597272C2 (en) 2016-09-10
JP6154889B2 (en) 2017-06-28
DE102012008761B4 (en) 2016-01-21

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