EP2295800A2 - Eccentric screw pump - Google Patents

Eccentric screw pump Download PDF

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Publication number
EP2295800A2
EP2295800A2 EP10172673A EP10172673A EP2295800A2 EP 2295800 A2 EP2295800 A2 EP 2295800A2 EP 10172673 A EP10172673 A EP 10172673A EP 10172673 A EP10172673 A EP 10172673A EP 2295800 A2 EP2295800 A2 EP 2295800A2
Authority
EP
European Patent Office
Prior art keywords
rotor
shaft
pump body
eccentric screw
screw
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Withdrawn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
EP10172673A
Other languages
German (de)
French (fr)
Other versions
EP2295800A3 (en
Inventor
André Hellinger
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.)
BARTEC Dispensing Technology GmbH
Original Assignee
BARTEC Dispensing Technology 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
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Application filed by BARTEC Dispensing Technology GmbH filed Critical BARTEC Dispensing Technology GmbH
Publication of EP2295800A2 publication Critical patent/EP2295800A2/en
Publication of EP2295800A3 publication Critical patent/EP2295800A3/en
Withdrawn legal-status Critical Current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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • 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
    • 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
    • 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
    • F04C2240/00—Components
    • F04C2240/60—Shafts

Definitions

  • the invention relates to an eccentric screw pump, comprising a pump body with a relative to the pump body rotatable screw-like rotor, which is coupled via a connecting means with a drive motor, via which the conveying element is rotatable.
  • Eccentric screw pumps serve to convey fluid media.
  • the rotor is usually made of a sufficiently strong material, usually stainless steel
  • the stator is made of an elastic material, usually a rubber or plastic material.
  • compartments which move during the rolling movement in the axial direction to a housing outlet.
  • the fluid material to be delivered is introduced into the housing at a position above the rotor-stator arrangement.
  • the basic structure and operation of such an eccentric screw pump is well known.
  • the drive of the rotor via a housing side to be connected to the drive motor, which is coupled in known eccentric screw directly with the coiled rotor.
  • corresponding connecting means are provided on the rotor as well as on the output shaft of the drive motor.
  • the invention is thus based on the problem of specifying a progressing cavity pump, which allows a simpler change of the rotor.
  • an eccentric screw pump of the type mentioned that the connecting means is rotatably mounted in the pump body and the pump body via at least one sealing element sealed connection shaft to which the rotor is detachably attached.
  • the rotor itself is not rotatably mounted and sealed to the pump housing. He is also not directly to couple with the drive motor. Rather, according to the invention a rotationally mounted in the pump body rotatably mounted connection shaft is provided, on the one hand has the connecting means for coupling the drive motor, and on the other hand has corresponding connection means for releasably securing the rotor at the other end of the shaft.
  • the rotor itself is not rotatably mounted in the pump body or sealed off to this, this is provided solely by the connection shaft.
  • a particularly simple type of detachable connection between the rotor and the connecting shaft is inventively characterized in that the connecting shaft is a hollow shaft, in which a screwed into the rotor, mounted counter to the hollow shaft connecting screw is inserted.
  • the hollow shaft is accessible from its end serving for coupling the drive motor end side, from this side, the connecting screw is used.
  • the rotor has a corresponding internal thread, in which the screw is screwed, about which the rotor is axially and rotatably coupled to the drive shaft.
  • a sealing ring is preferably arranged below the screw head.
  • a plug-in sleeve is expediently provided with the internal thread, which engages in a counter-mounted socket on the hollow shaft.
  • At least one sealing element can furthermore be arranged between the connecting shaft and the rotor.
  • Rotor and connecting shaft are axially seen with corresponding shoulders together, in between a suitable sealing ring can be arranged, which also ensures a complete seal here.
  • FIG. 1 shows a sectional view of an eccentric screw pump 1 according to the invention comprising a pump body 2 consisting of a first body part 3 and a second body part 4, in which a rotatable rotor 5, which extends through both body parts 3, 4, and a positionally fixed stator 6, the second body part 4 is arranged are received.
  • Via inlets 7, 8 can be supplied to be conveyed fluid medium, which passes in the diameter larger than the rotor 5 designed pump body in the effective range between the rotor 5 and stator 6, where it is discharged from there via an outlet 9.
  • the rotor 5 has a coiled, helical metal rotor section 10, the inner side 11 of the stator 6 is also helically wound, so that it comes to the formation of longitudinally to the outlet 9 "migrating" cavities, so-called compartments, in which the fluid medium is transported.
  • the rotor 5 itself has in addition to the helical rotor portion 10 via a flexible, wave-like portion 12, which allows an eccentric movement of the rotor 5.
  • the flexible rotor portion 12 is fixedly connected to the helical rotor portion 10 via a retaining sleeve 13, at the other end of the flexible rotor portion 12 is a further retaining sleeve 14 is provided, which will be discussed below, the releasable coupling is used to a connection shaft.
  • the basic structure of such an eccentric screw pump as well as a rotor 5 and stator 6 is well known and need not be explained.
  • connection shaft 15 is provided, which is rotatably mounted on the housing body 3 in the example shown two bearings 16. About seals 17, the connecting shaft 15 is sealed to the pump body 2 respectively to the body member 3, so that the discontinued before the seals 17 material can not get in the direction of the connecting shaft 15.
  • the connecting shaft 15 has at its right end shown in the figure via connecting means for releasably coupling to a drive motor respectively the output shaft thereof. It is designed as a hollow shaft 19 to receive a connecting screw 20 which serves to releasably fix the rotor 5.
  • the hollow shaft 19 on the one hand on an inwardly projecting stop collar 21 on which the screw head 22 is superimposed.
  • An insertion opening 23 leads into a socket 24 whose inner diameter is slightly larger than the outer diameter of a socket 25 which is formed on the bushing 14 and has an internal thread 26 into which the shank of the connecting screw 20 is screwed.
  • sealing element 27 for example a sealing ring or a sealing washer, received, in a groove 28 at the free end of the socket 24 is another sealing element 29, also in the form of a sealing ring provided.
  • sealing element 27 is a secure seal in the screw head bearing, via the sealing element 29, the transition between the rotor 5 and the connecting shaft 15 is sealed.
  • the second body component 4 which is screwed to the first body component 3 via a screw connection 30, is unscrewed, so that the stator 6, which consists of a soft, elastic material, is unscrewed from the rotor 5 respectively can be deducted from the rotor section 10.
  • connection shaft 15 remains rotatably mounted and completely sealed in the pump body 2 and the body part 3, after neither the rolling bearings 16 nor the seals 17 to remove the rotor 5 are to be removed. This is because in the eccentric screw pump according to the invention, the connection shaft 15 is rotatably mounted and received sealed to the pump body 2 out, but not the rotor 5 itself.

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

Abstract

The pump (1) has a pump body (2) with a screw-like rotor (5) rotatable relative to the pump body. The rotor is coupled with a driving motor by a connecting unit, where the rotor is rotatable by the driving motor. The connecting unit is designed as a connecting shaft (15) rotatably supported in the pump body. The connecting shaft is sealed to the pump body by a sealing element (17), and the rotor is detachably arranged at the connecting shaft. The connecting shaft is designed as a hollow shaft (19) into which a connecting bolt (20) is inserted, where the bolt is screwed into the rotor.

Description

Die Erfindung betrifft eine Exzenterschneckenpumpe, umfassend einen Pumpenkörper mit einem relativ zum Pumpenkörper drehbaren schneckenartigen Rotor, der über ein Verbindungsmittel mit einem Antriebsmotor, über den das Förderelement drehbar ist, koppelbar ist.The invention relates to an eccentric screw pump, comprising a pump body with a relative to the pump body rotatable screw-like rotor, which is coupled via a connecting means with a drive motor, via which the conveying element is rotatable.

Exzenterschneckenpumpen dienen zum Fördern fluider Medien. Ein angetriebener schneckenförmig gewendelter Rotor, das eigentliche Fördermittel, wälzt sich auf der ebenfalls schneckenförmig gewendelten Innenseite des Stators, üblicherweise Teil des Gehäuses, ab. Hierbei kommt es zu einer exzentrischen Drehbewegung um die Statorachse. Während der Rotor üblicherweise aus einem hinreichend festem Material, in der Regel Edelstahl, besteht, besteht der Stator aus einem elastischen Material, üblicherweise einem Gummi- oder Kunststoffmaterial. In Folge der jeweils schneckenförmigen Ausführung des Rotors und des Stators kommt es zur Bildung abgeteilter Räume, sogenannter Kompartimente, die sich während der Wälzbewegung in axialer Richtung zu einem Gehäuseauslass bewegen. Das zu fördernde fluide Material wird an einer Stelle oberhalb der Rotor-Stator-Anordnung in das Gehäuse aufgegeben. Der grundsätzliche Aufbau und die Funktionsweise einer solchen Exzenterschneckenpumpe ist hinlänglich bekannt.Eccentric screw pumps serve to convey fluid media. A driven spiral-shaped helical rotor, the actual conveying means, rolls on the likewise helically coiled inside of the stator, usually part of the housing from. This results in an eccentric rotation about the stator axis. While the rotor is usually made of a sufficiently strong material, usually stainless steel, the stator is made of an elastic material, usually a rubber or plastic material. As a result of the respective helical shape of the rotor and the stator, there are formed divided spaces, so-called compartments, which move during the rolling movement in the axial direction to a housing outlet. The fluid material to be delivered is introduced into the housing at a position above the rotor-stator arrangement. The basic structure and operation of such an eccentric screw pump is well known.

Der Antrieb des Rotors erfolgt über einen gehäuseseitig anzubindenden Antriebsmotor, der bei bekannten Exzenterschneckenpumpen unmittelbar mit dem gewendelten Rotor gekoppelt wird. Hierzu sind am Rotor wie an der Abtriebswelle des Antriebsmotors entsprechende Verbindungsmittel vorgesehen.The drive of the rotor via a housing side to be connected to the drive motor, which is coupled in known eccentric screw directly with the coiled rotor. For this purpose, corresponding connecting means are provided on the rotor as well as on the output shaft of the drive motor.

Da die Förderelemente, nämlich Rotor und Stator, bei solchen Pumpen stark beansprucht und verschleißbehaftet sind, ist mitunter ein Wechsel des Rotors und des Stators erforderlich. Während der Wechsel des Stators relativ einfach ist, nachdem lediglich der Stator bzw. der im Gehäuseabschnitt, der den Stator enthält, vom Rotor heruntergezogen werden muss, ist das Wechseln des Rotors sehr aufwendig. Denn der Rotor ist am oberen Ende, also der Antriebsseite, die mit dem Antriebsmotor zu koppeln ist, über Lager und Dichtungen drehbar und abgedichtet im Pumpenkörper gelagert. Diese Lager und Dichtungen müssen zum Entnehmen des Rotors entfernt und nach Setzen des neuen Rotors exakt auf den dafür vorgesehenen Bereichen angebracht und positioniert werden, um die korrekte und vor allem dichte Aufnahme des Rotors im Pumpengehäuse zu gewährleisten. Dieser Arbeitsschritt ist sehr zeitaufwendig und häufig mit Fehlern verbunden.Since the conveying elements, namely rotor and stator, are heavily stressed and subject to wear in such pumps, a change of the rotor and the stator is sometimes required. While the change of the stator is relatively simple, after only the stator or in the housing section, which contains the stator has to be pulled down from the rotor, changing the rotor is very expensive. Because the rotor is at the upper end, so the drive side, the To be coupled with the drive motor is mounted rotatably and sealed in the pump body via bearings and seals. These bearings and seals must be removed to remove the rotor and, after the new rotor has been set, mounted and positioned precisely in the designated areas to ensure the correct and, above all, tight reception of the rotor in the pump housing. This step is very time consuming and often associated with errors.

Der Erfindung liegt damit das Problem zugrunde, eine Exzenterschneckenpumpe anzugeben, die einen einfacheren Wechsel des Rotors ermöglicht.The invention is thus based on the problem of specifying a progressing cavity pump, which allows a simpler change of the rotor.

Zur Lösung dieses Problems ist bei einer Exzenterschneckenpumpe der eingangs genannten Art erfindungsgemäß vorgesehen, dass das Verbindungsmittel eine im Pumpenkörper drehgelagerte und zum Pumpenkörper über wenigstens ein Dichtelement abgedichtete Anschlusswelle ist, an der der Rotor lösbar angebracht ist.To solve this problem is provided according to the invention in an eccentric screw pump of the type mentioned that the connecting means is rotatably mounted in the pump body and the pump body via at least one sealing element sealed connection shaft to which the rotor is detachably attached.

Anders als bisher ist der Rotor nicht selbst drehgelagert und zum Pumpengehäuse hin abgedichtet. Er ist ferner nicht unmittelbar mit dem Antriebsmotor zu koppeln. Vielmehr ist erfindungsgemäß eine im Pumpenkörper abgedichtet drehgelagerte Anschlusswelle vorgesehen, die einerseits das Verbindungsmittel zum Ankoppeln des Antriebsmotors aufweist, und die andererseits entsprechende Verbindungsmittel zum lösbaren Befestigen des Rotors am anderen Wellenende aufweist. Der Rotor selbst ist im Pumpenkörper nicht drehgelagert respektive zu diesem hin abgedichtet, dies ist allein seitens der Anschlusswelle vorgesehen. Nachdem die Drehlagerung und Abdichtung der Anschlusswelle an einer Position - gesehen vom Rotor in Richtung zum Antriebsmotor - hinter der lösbaren Verbindungsstelle Rotor-Anschlusswelle vorgesehen sind, ergibt sich hieraus, dass zum Lösen des Rotors weder die Wellenlager noch die Wellendichtungen zu entfernen sind. Vielmehr ist es für die einfache Entnahme des Rotors lediglich erforderlich, die lösbare Verbindung zwischen Rotor und Anschlusswelle zu öffnen und den Rotor zu entfernen.Unlike before, the rotor itself is not rotatably mounted and sealed to the pump housing. He is also not directly to couple with the drive motor. Rather, according to the invention a rotationally mounted in the pump body rotatably mounted connection shaft is provided, on the one hand has the connecting means for coupling the drive motor, and on the other hand has corresponding connection means for releasably securing the rotor at the other end of the shaft. The rotor itself is not rotatably mounted in the pump body or sealed off to this, this is provided solely by the connection shaft. After the pivot bearing and sealing of the connecting shaft are provided at a position - seen from the rotor in the direction of the drive motor - behind the detachable connection point rotor connection shaft, it follows that to release the rotor neither the shaft bearing nor the shaft seals are to be removed. Rather, it is only necessary for the simple removal of the rotor to open the detachable connection between the rotor and connecting shaft and to remove the rotor.

Eine besonders einfache Art der lösbaren Verbindung zwischen Rotor und Anschlusswelle ist erfindungsgemäß dadurch gekennzeichnet, dass die Anschlusswelle eine Hohlwelle ist, in die eine in den Rotor eingeschraubte, an der Hohlwelle gegengelagerte Verbindungsschraube eingesetzt ist. Die Hohlwelle ist von ihrer zum Ankoppeln des Antriebsmotors dienenden Stirnseite her zugänglich, von dieser Seite wird die Verbindungsschraube eingesetzt. Der Rotor verfügt über ein entsprechendes Innengewinde, in das die Schraube eingeschraubt wird, worüber der Rotor axial und drehfest mit der Antriebswelle gekoppelt wird. Zur Sicherstellung einer guten Abdichtung ist bevorzugt unterhalb des Schraubenkopfs ein Dichtring angeordnet.A particularly simple type of detachable connection between the rotor and the connecting shaft is inventively characterized in that the connecting shaft is a hollow shaft, in which a screwed into the rotor, mounted counter to the hollow shaft connecting screw is inserted. The hollow shaft is accessible from its end serving for coupling the drive motor end side, from this side, the connecting screw is used. The rotor has a corresponding internal thread, in which the screw is screwed, about which the rotor is axially and rotatably coupled to the drive shaft. To ensure a good seal, a sealing ring is preferably arranged below the screw head.

Am Rotor selbst ist zweckmäßigerweise eine Steckhülse mit dem Innengewinde vorgesehen, die in eine an der Hohlwelle gegengelagerte Steckbuchse eingreift.On the rotor itself, a plug-in sleeve is expediently provided with the internal thread, which engages in a counter-mounted socket on the hollow shaft.

Um auch im direkten Übergangsbereich vom Rotor zur Anschlusswelle für eine gute Abdichtung zu sorgen kann ferner zwischen der Anschlusswelle und dem Rotor wenigstens ein Dichtelement angeordnet sein. Rotor und Anschlusswelle liegen axial gesehen mit entsprechenden Schultern aneinander, dazwischen kann ein geeigneter Dichtring angeordnet werden, der auch hier für eine vollständige Abdichtung sorgt.In order to provide a good seal also in the direct transition region from the rotor to the connecting shaft, at least one sealing element can furthermore be arranged between the connecting shaft and the rotor. Rotor and connecting shaft are axially seen with corresponding shoulders together, in between a suitable sealing ring can be arranged, which also ensures a complete seal here.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus dem im Folgenden beschriebenen Ausführungsbeispiel sowie anhand der Zeichnung.Further advantages, features and details of the invention will become apparent from the embodiment described below and from the drawing.

Die Figur zeigt eine Schnittansicht einer erfindungsgemäßen Exzenterschneckenpumpe 1 umfassend einen Pumpenkörper 2 bestehend aus einem ersten Körperbauteil 3 und einem zweiten Körperbauteil 4, in denen ein drehbarer Rotor 5, der sich durch beide Körperbauteile 3, 4 erstreckt, sowie ein positionsfester Stator 6, der im zweiten Körperbauteil 4 angeordnet ist, aufgenommen sind. Über Einlässe 7, 8 kann zu förderndes fluides Medium zugeführt werden, das in dem vom Durchmesser her größer als der Rotor 5 ausgelegten Pumpenkörper in den Wirkbereich zwischen Rotor 5 und Stator 6 gelangt, wobei es von dort über einen Auslass 9 abgegeben wird. Der Rotor 5 verfügt über einen gewendelten, schneckenförmigen metallenen Rotorabschnitt 10, die Innenseite 11 des Stators 6 ist ebenfalls schneckenförmig gewendelt, so dass es zur Bildung von in Längsrichtung zum Auslass 9 "wandernden" Hohlräumen, sogenannten Kompartimenten, kommt, in denen das fluide Medium transportiert wird.The figure shows a sectional view of an eccentric screw pump 1 according to the invention comprising a pump body 2 consisting of a first body part 3 and a second body part 4, in which a rotatable rotor 5, which extends through both body parts 3, 4, and a positionally fixed stator 6, the second body part 4 is arranged are received. Via inlets 7, 8 can be supplied to be conveyed fluid medium, which passes in the diameter larger than the rotor 5 designed pump body in the effective range between the rotor 5 and stator 6, where it is discharged from there via an outlet 9. The rotor 5 has a coiled, helical metal rotor section 10, the inner side 11 of the stator 6 is also helically wound, so that it comes to the formation of longitudinally to the outlet 9 "migrating" cavities, so-called compartments, in which the fluid medium is transported.

Der Rotor 5 selbst verfügt neben dem schneckenförmigen Rotorabschnitt 10 über einen flexiblen, wellenartigen Abschnitt 12, der eine exzentrische Bewegung des Rotors 5 ermöglicht. Der flexible Rotorabschnitt 12 ist mit dem schneckenförmigen Rotorabschnitt 10 über eine Haltebuchse 13 fest verbunden, am anderen Ende des flexiblen Rotorabschnitts 12 ist eine weitere Haltebuchse 14 vorgesehen, die, vorauf nachfolgend noch eingegangen wird, der lösbaren Kopplung zu einer Anschlusswelle dient. Der grundsätzliche Aufbau einer solchen Exzenterschneckenpumpe wie auch eines Rotors 5 und Stators 6 ist hinlänglich bekannt und muss nicht mehr erläutert werden.The rotor 5 itself has in addition to the helical rotor portion 10 via a flexible, wave-like portion 12, which allows an eccentric movement of the rotor 5. The flexible rotor portion 12 is fixedly connected to the helical rotor portion 10 via a retaining sleeve 13, at the other end of the flexible rotor portion 12 is a further retaining sleeve 14 is provided, which will be discussed below, the releasable coupling is used to a connection shaft. The basic structure of such an eccentric screw pump as well as a rotor 5 and stator 6 is well known and need not be explained.

Im ersten Körperbauteil 3 ist eine Anschlusswelle 15 vorgesehen, die über im gezeigten Beispiel zwei Wälzlager 16 am Gehäusekörper 3 drehgelagert ist. Über Dichtungen 17 ist die Anschlusswelle 15 zum Pumpenkörper 2 respektive zum Körperbauteil 3 hin abgedichtet, so dass das vor den Dichtungen 17 aufgegebene Material nicht in Richtung der Anschlusswelle 15 gelangen kann.In the first body member 3, a connection shaft 15 is provided, which is rotatably mounted on the housing body 3 in the example shown two bearings 16. About seals 17, the connecting shaft 15 is sealed to the pump body 2 respectively to the body member 3, so that the discontinued before the seals 17 material can not get in the direction of the connecting shaft 15.

Die Anschlusswelle 15 verfügt an ihrem in der Figur gezeigten rechten Ende über Anschlussmittel zum lösbaren Ankoppeln an einen Antriebsmotor respektive dessen Abtriebswelle. Sie ist als Hohlwelle 19 ausgeführt, um eine Verbindungsschraube 20 aufzunehmen, die der lösbaren Fixierung des Rotors 5 dient. Zu diesem Zweck weißt die Hohlwelle 19 zum einen einen nach innen vorspringenden Anschlagbund 21 auf, an dem der Schraubenkopf 22 aufgelagert ist. Eine Durchsteckdurchbrechung 23 führt in eine Steckbuchse 24, deren Innendruchmesser etwas größer ist als der Außendurchmesser einer Steckhülse 25, die an der Buchse 14 ausgebildet ist und über ein Innengewinde 26 verfügt, in das der Schaft der Verbindungsschraube 20 eingeschraubt wird. Unterhalb des Schraubenkopfes 22 ist ein Dichtelement 27, beispielsweise ein Dichtring oder eine Dichtscheibe, aufgenommen, in einer Nut 28 am freien Ende der Steckbuchse 24 ist ein weiteres Dichtelement 29, ebenfalls in Form eines Dichtrings, vorgesehen. Über das Dichtelement 27 erfolgt eine sichere Abdichtung im Bereich der Schraubenkopfauflagerung, über das Dichtelement 29 wird der Übergang zwischen dem Rotor 5 und der Anschlusswelle 15 abgedichtet.The connecting shaft 15 has at its right end shown in the figure via connecting means for releasably coupling to a drive motor respectively the output shaft thereof. It is designed as a hollow shaft 19 to receive a connecting screw 20 which serves to releasably fix the rotor 5. For this purpose, the hollow shaft 19 on the one hand on an inwardly projecting stop collar 21 on which the screw head 22 is superimposed. An insertion opening 23 leads into a socket 24 whose inner diameter is slightly larger than the outer diameter of a socket 25 which is formed on the bushing 14 and has an internal thread 26 into which the shank of the connecting screw 20 is screwed. Below the screw head 22 is a sealing element 27, for example a sealing ring or a sealing washer, received, in a groove 28 at the free end of the socket 24 is another sealing element 29, also in the form of a sealing ring provided. About the sealing element 27 is a secure seal in the screw head bearing, via the sealing element 29, the transition between the rotor 5 and the connecting shaft 15 is sealed.

Soll nun der Stator und der Rotor ausgetauscht werden, so wird zunächst das zweite Körperbauteil 4, das über eine Schraubenverbindung 30 mit dem ersten Körperbauteil 3 verschraubt ist, abgeschraubt, so dass der Stator 6, der aus weichem, elastischem Material besteht, vom Rotor 5 respektive dem Rotorabschnitt 10 abgezogen werden kann.If the stator and the rotor are now to be exchanged, the second body component 4, which is screwed to the first body component 3 via a screw connection 30, is unscrewed, so that the stator 6, which consists of a soft, elastic material, is unscrewed from the rotor 5 respectively can be deducted from the rotor section 10.

Sodann wird mit einem geeigneten Werkzeug die Verbindungsschraube 20 (die Exzenterschneckenpumpe 1 ist selbstverständlich vom Antriebsmotor getrennt) aufgeschraubt und folglich die feste Schraubverbindung zwischen Rotor 5 und Anschlusswelle 15 gelöst. Nun kann der Rotor 5 aus dem Pumpenkörper 2 respektive dem Körperbauteil 3 herausgezogen werden. Die Anschlusswelle 15 verbleibt drehgelagert und vollständig abgedichtet im Pumpenkörper 2 respektive dem Körperbauteil 3, nachdem weder die Wälzlager 16 noch die Dichtungen 17 zum Entnehmen des Rotors 5 zu entfernen sind. Dies deshalb, da bei der erfindungsgemäßen Exzenterschneckenpumpe die Anschlusswelle 15 drehgelagert und zum Pumpenkörper 2 hin abgedichtet aufgenommen ist, nicht aber der Rotor 5 selbst.Then, with a suitable tool, the connecting screw 20 (the eccentric screw pump 1 is of course separated from the drive motor) screwed and thus solved the fixed screw connection between the rotor 5 and connecting shaft 15. Now, the rotor 5 can be pulled out of the pump body 2 and the body part 3, respectively. The connection shaft 15 remains rotatably mounted and completely sealed in the pump body 2 and the body part 3, after neither the rolling bearings 16 nor the seals 17 to remove the rotor 5 are to be removed. This is because in the eccentric screw pump according to the invention, the connection shaft 15 is rotatably mounted and received sealed to the pump body 2 out, but not the rotor 5 itself.

Zum erneuten Einsetzen eines Rotors 5 wird dieser in das Körperbauteil 3 eingeschoben, so dass die Steckhülse 25 in die Steckbuchse 24 eingreift. Anschließend wir die Verbindungsschraube 20 nebst Dichtelement 27 eingeführt und im Innengewinde 26 fest verschraubt. Der Rotor 5 steht damit wieder in drehfester Verbindung mit der Antriebswelle 15. Sodann wird der neue Stator 6 mit samt dem zweiten Körperbauteil 4 aufgeschoben, wonach das Körperbauteil 4 auf das Körperbauteil 3 über die Gewindeverbindung 30 aufgeschraubt und befestigt wird.For re-insertion of a rotor 5, this is inserted into the body part 3, so that the plug-in sleeve 25 engages in the socket 24. Subsequently, we introduced the connecting screw 20 together with the sealing element 27 and firmly screwed in the internal thread 26. The rotor 5 is thus again in rotationally fixed connection with the drive shaft 15. Thereafter, the new stator 6 is pushed together with the second body part 4, after which the body part 4 is screwed onto the body part 3 via the threaded connection 30 and fastened.

Claims (5)

Exzenterschneckenpumpe, umfassend einen Pumpenkörper mit einem relativ zum Pumpenkörper drehbaren schneckenartigen Rotor, der über ein Verbindungsmittel mit einem Antriebsmotor, über den der Rotor drehbar ist, koppelbar ist, dadurch gekennzeichnet, dass das Verbindungsmittel eine im Pumpenkörper (2) drehgelagerte und zum Pumpenkörper (2) über wenigstens ein Dichtelement (17) abgedichtete Anschlusswelle (15) ist, an der der Rotor (5) lösbar angeordnet ist.An eccentric screw pump, comprising a pump body with a relative to the pump body rotatable screw-like rotor, which is coupled via a connecting means with a drive motor, via which the rotor is rotatable, characterized in that the connecting means rotatably mounted in the pump body (2) and the pump body (2 ) via at least one sealing element (17) sealed connection shaft (15) on which the rotor (5) is detachably arranged. Exzenterschneckenpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Anschlusswelle (15) eine Hohlwelle (19) ist, in die eine in der Rotor (5) eingeschraubte, an der Hohlwelle (19) gegengelagerten Verbindungsschraube (20) eingesetzt ist.Eccentric screw pump according to claim 1, characterized in that the connecting shaft (15) is a hollow shaft (19) into which a in the rotor (5) screwed, on the hollow shaft (19) mounted opposite connecting screw (20) is inserted. Exzenterschneckenpumpe nach Anspruch 2, dadurch gekennzeichnet, dass unterhalb des Schraubenkopfs (22) ein Dichtring (27) angeordnet ist.Eccentric screw pump according to claim 2, characterized in that below the screw head (22) a sealing ring (27) is arranged. Exzenterschneckenpumpe nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass an dem Rotor (5) eine Steckhülse (25) mit einem Innengewinde (26) vorgesehen ist, die in eine an der Hohlwelle (19) vorgesehene Steckbuchse (24) eingreift.Eccentric screw pump according to claim 2 or 3, characterized in that on the rotor (5) has a plug-in sleeve (25) is provided with an internal thread (26) which engages in a socket (24) provided on the hollow shaft (19). Exzenterschneckenpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der Anschlusswelle (19) und dem Rotor (5) wenigstens ein Dichtelement (29) angeordnet ist.Eccentric screw pump according to one of the preceding claims, characterized in that between the connecting shaft (19) and the rotor (5) at least one sealing element (29) is arranged.
EP10172673A 2009-08-20 2010-08-12 Eccentric screw pump Withdrawn EP2295800A3 (en)

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DE200910037993 DE102009037993B4 (en) 2009-08-20 2009-08-20 Cavity Pump

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EP2295800A3 EP2295800A3 (en) 2012-06-13

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CN103075336A (en) * 2013-02-23 2013-05-01 赵润波 Self-thrust single-screw pump system
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CN102734155A (en) * 2012-07-20 2012-10-17 赵锡寰 Energy-saving start device of submersible screw pump unit
CN102734155B (en) * 2012-07-20 2014-12-03 赵锡寰 Energy-saving start device of submersible screw pump unit
CN103075336A (en) * 2013-02-23 2013-05-01 赵润波 Self-thrust single-screw pump system
WO2019154571A1 (en) * 2018-02-06 2019-08-15 Seepex Gmbh Progressive cavity pump
US12018688B2 (en) 2022-02-14 2024-06-25 Johnson & Johnson Surgical Vision, Inc. Sealing assembly for a progressive cavity pump

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DE102009037993B4 (en) 2014-07-03
DE102009037993A1 (en) 2011-03-03
DE102009037993A8 (en) 2011-06-01
EP2295800A3 (en) 2012-06-13

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