EP0947700B1 - Moineau pump - Google Patents

Moineau pump Download PDF

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Publication number
EP0947700B1
EP0947700B1 EP99103358A EP99103358A EP0947700B1 EP 0947700 B1 EP0947700 B1 EP 0947700B1 EP 99103358 A EP99103358 A EP 99103358A EP 99103358 A EP99103358 A EP 99103358A EP 0947700 B1 EP0947700 B1 EP 0947700B1
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EP
European Patent Office
Prior art keywords
eccentric screw
coupling rod
piece component
screw pump
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99103358A
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German (de)
French (fr)
Other versions
EP0947700A1 (en
Inventor
Gordon L. Fenton
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.)
Seepex GmbH
Original Assignee
Seepex Seeberger GmbH and Co
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Filing date
Publication date
Application filed by Seepex Seeberger GmbH and Co filed Critical Seepex Seeberger GmbH and Co
Publication of EP0947700A1 publication Critical patent/EP0947700A1/en
Application granted granted Critical
Publication of EP0947700B1 publication Critical patent/EP0947700B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/08—Thermoplastics

Definitions

  • the invention relates to an eccentric screw pump, with an eccentric screw rotor mounted in an eccentric screw stator, with one in one to the eccentric screw stator connected suction housing Clutch rod, and with one to a drive shaft leading connecting shaft, the eccentric screw rotor, the coupling rod and the connecting shaft as one-piece component made of thermoplastic are executed.
  • an eccentric screw pump whose Eccentric screw rotor in an eccentric screw stator is stored.
  • the aforementioned eccentric screw rotor is on a flexible coupling rod connected, which in turn with a drive shaft and a drive in Connection is established.
  • the eccentric screw rotor and the coupling rod made in one piece.
  • the coupling rod can constrict a bend over a certain length (see WO 97/40 273).
  • the eccentric screw rotor, the coupling rod and the connecting shaft regularly made of stainless steel and under Interposition of joints connected together. At least the eccentric screw rotor is often still preserved an additional surface coating or is polished. There are generally several for the articulated connections Components and elastic cuffs needed. - Also one Such construction is constructive and material Respectful. Here, the invention as a whole Remedy.
  • the invention is based on the technical problem extremely simple and inexpensive progressing cavity pump with multiple storage of the one-piece component to deliver.
  • the invention proposes a Generic progressing cavity pump before that one-piece component, consisting of eccentric screw rotor, Coupling rod and connecting shaft, in the Transitional areas from the eccentric screw rotor to the Coupling rod and from the coupling rod to the Connection shaft in each case constricting constrictions in Has form of diameter reductions.
  • the entire area of the coupling rod serves as a joint and is constricted accordingly.
  • the Connection shaft usually in one to the suction housing connected seal housing stored.
  • one-piece component it can be one trade glass fiber reinforced plastic.
  • the one-piece component made of glass fiber reinforced Plastic, there is a particularly high power transmission enable and perfect dimensional accuracy guarantee.
  • the one-piece component consists of polyamide, e.g. polyamide 66.
  • This plastic is characterized by elastic Rigidity, high abrasion resistance and heat resistance , is also sterilizable and has Barrier properties against flavorings.
  • this is Plastic especially for the one-piece construction of Eccentric screw rotor, coupling rod and connecting shaft suitable, especially since it is in physical and chemical Regards those properties that are relevant for the Pump line of an eccentric screw pump are required which are used to promote especially pharmaceutical and food products, but also cosmetic products and products is used for paint production.
  • Embodiment of the invention can be the one-piece component but also consists of polytetrafluoroethylene, which is characterized by special lubricating properties.
  • this Case becomes a Embodiment with a graphite filling of 10% to 15% prefers.
  • the pump drive with the drive shaft 7 is only indicated.
  • the eccentric screw rotor 3, the coupling rod 5 and the Connecting shaft 8 are made as a one-piece component thermoplastic plastic.
  • the plastic component points in the transition areas from the Eccentric screw rotor 3 to the coupling rod 5 and from the coupling rod 5 to the connecting shaft 8 diameter reductions on what else in these areas replace the required articulated connections.
  • the exemplary embodiment concerns these diameter reductions from concave cross-sections 9.
  • the one-piece plastic component 3, 5, 8 can be made of glass fiber reinforced Plastic consist of the power transmission on the one hand and the dimensional accuracy of this on the other hand to optimize the rotating pump line.
  • To the embodiment consists of the one-piece plastic component 3, 5, 8 made of polyamide, namely polyamide 66 and leaves easily manufactured by injection molding. About that is also a machining and the Compliance with the finest tolerances possible.

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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)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The new form of mono pump (1) has a stator (2) containing a rotor (3) mounted on bearings. The rotor is connected to a moulded coupling rod (5). This is contained by the suction casing (4) connected to the stator. The rod joins a connecting shaft (8) in the suction casing, which leads to the drive shaft connection, through the sealed casing (6). The rotor, coupling rod and connecting shaft are made as an integral, one-piece component in thermoplastic material. Preferably, a glass fibre-reinforced plastics material is used, especially polyamide 66 (RTM) or polytetrafluoroethylene, optionally with graphite filling.

Description

Die Erfindung betrifft eine Exzenterschneckenpumpe, mit einem in einem Exzenterschneckenstator gelagerten Exzenterschneckenrotor, mit einer in einem an den Exzenterschneckenstator angeschlossenen Sauggehäuse gelagerten Kupplungsstange, und mit einer zu einer Antriebswelle führenden Verbindungswelle, wobei der Exzenterschneckenrotor, die Kupplungsstange und die Verbindungswelle als einteiliges Bauteil aus thermoplastischem Kunststoff ausgeführt sind.The invention relates to an eccentric screw pump, with an eccentric screw rotor mounted in an eccentric screw stator, with one in one to the eccentric screw stator connected suction housing Clutch rod, and with one to a drive shaft leading connecting shaft, the eccentric screw rotor, the coupling rod and the connecting shaft as one-piece component made of thermoplastic are executed.

Es ist eine Exzenterschneckenpumpe des eingangs beschriebenen Aufbaus bekannt, bei welcher der Exzenterschneckenrotor, die Kupplungsstange sowie die Verbindungswelle als einteiliges Bauteil aus thermoplastischem Kunststoff ausgeführt sind. Dieses kombinierte Bauteil besitzt eine konventionelle Lagerung, die relativ aufwendig gestaltet ist (vgl. US-PS 5 108 273).It is an eccentric screw pump of the type described at the beginning Construction known in which the eccentric screw rotor, the coupling rod and the connecting shaft as one-piece component made of thermoplastic material are. This combined component has a conventional one Storage that is designed relatively complex (see U.S. Patent 5,108,273).

Darüber hinaus ist eine ähnliche Schraubenpumpe bzw. Exzenterschneckenpumpe bekannt geworden, bei welcher der zugehörige Rotor mit einer Antriebswelle durch einen elastischen Drehstab verbunden ist. Der Drehstab und der Rotor bestehen aus Kunststoff und sind zusammen mit dem Rohr aus einem Stück gefertigt. Allerdings wird auch hier eine gesonderte Lagerung als unabdingbar angesehen (vgl. DE-OS 2 040 748). In addition, a similar screw pump or Eccentric screw pump become known, in which the associated rotor with a drive shaft through a elastic torsion bar is connected. The torsion bar and the Rotor are made of plastic and are together with the Pipe made from one piece. However, here too separate storage is considered essential (cf. DE-OS 2 040 748).

Schließlich kennt man eine Exzenterschneckenpumpe, deren Exzenterschneckenrotor in einem Exzenterschneckenstator gelagert ist. Der vorgenannte Exzenterschneckenrotor ist an eine flexible Kupplungsstange angeschlossen, welche ihrerseits mit einer Antriebswelle sowie einem Antrieb in Verbindung steht. Dabei sind lediglich der Exzenterschneckenrotor sowie die Kupplungsstange einstückig ausgeführt. Zusätzlich kann die Kupplungsstange eine Biegeeinschnürung über eine bestimmte Länge aufweisen (vgl. WO 97/40 273).After all, you know an eccentric screw pump whose Eccentric screw rotor in an eccentric screw stator is stored. The aforementioned eccentric screw rotor is on a flexible coupling rod connected, which in turn with a drive shaft and a drive in Connection is established. There are only the eccentric screw rotor and the coupling rod made in one piece. In addition, the coupling rod can constrict a bend over a certain length (see WO 97/40 273).

Bei ähnlichen Exzenterschneckenpumpen sind der Exzenterschneckenrotor, die Kupplungsstange und die Verbindungswelle regelmäßig aus Edelstahl hergestellt und unter Zwischenschaltung von Gelenken miteinander verbunden. Zumindest der Exzenterschneckenrotor erhält häufig noch eine zusätzliche Oberflächen-Beschichtung oder ist poliert. Für die Gelenkverbindungen werden im allgemeinen mehrere Bauteile und elastische Manschetten benötigt. - Auch eine derartige Bauweise ist in konstruktiver und materialmäßiger Hinsicht aufwendig. Hier will die Erfindung insgesamt Abhilfe schaffen.With similar eccentric screw pumps, the eccentric screw rotor, the coupling rod and the connecting shaft regularly made of stainless steel and under Interposition of joints connected together. At least the eccentric screw rotor is often still preserved an additional surface coating or is polished. There are generally several for the articulated connections Components and elastic cuffs needed. - Also one Such construction is constructive and material Respectful. Here, the invention as a whole Remedy.

Der Erfindung liegt das technische Problem zugrunde, eine extrem einfache und kostengünstige Exzenterschneckenpumpe mit Vielfachlagerung des einteiligen Bauteiles zur Verfügung zu stellen.The invention is based on the technical problem extremely simple and inexpensive progressing cavity pump with multiple storage of the one-piece component to deliver.

Zur Lösung dieser Aufgabe schlägt die Erfindung bei einer gattungsgemäßen Exzenterschneckenpumpe vor, daß das einteilige Bauteil, bestehend aus Exzenterschneckenrotor, Kupplungsstange und Verbindungswelle, in den Übergangsbereichen von dem Exzenterschneckenrotor zu der Kupplungsstange und von der Kupplungsstange zu der Verbindungswelle jeweils gelenkbildende Einschnürungen in Form von Durchmesserreduzierungen aufweist. - Vorzugsweise dient der gesamte Bereich der Kupplungsstange als Gelenk und ist entsprechend eingeschnürt. Außerdem wird die Verbindungswelle in der Regel in einem an das Sauggehäuse angeschlossenen Dichtungsgehäuse gelagert. Bei dem einteiligen Bauteil kann es sich um ein solches aus glasfaserverstärktem Kunststoff handeln. Im übrigen empfiehlt die Erfindung, die gelenkbildenden Einschnürungen als konkave Durchmesserreduzierungen auszuführen.To achieve this object, the invention proposes a Generic progressing cavity pump before that one-piece component, consisting of eccentric screw rotor, Coupling rod and connecting shaft, in the Transitional areas from the eccentric screw rotor to the Coupling rod and from the coupling rod to the Connection shaft in each case constricting constrictions in Has form of diameter reductions. - Preferably the entire area of the coupling rod serves as a joint and is constricted accordingly. In addition, the Connection shaft usually in one to the suction housing connected seal housing stored. In which one-piece component, it can be one trade glass fiber reinforced plastic. Furthermore recommends the invention, the joint-forming constrictions designed as concave diameter reductions.

Diese Maßnahmen der Erfindung haben zur Folge, daß bei der erfindungsgemäßen Exzenterschneckenpumpe nur noch eine einzige rotierende Kunststoffeinheit für die Kraftübertragung und Produktförderung benötigt wird. Insoweit wird eine aseptische Bauweise verwirklicht, welche für die Förderung von insbesondere Lebensmittel- und Pharmaprodukten geeignet ist, zumal sich die erfindungsgemäße Exzenterschneckenpumpe infolge der einteiligen Bauweise von Exzenterschneckenrotor, Kupplungsstange und Verbindungswelle aus Kunststoff durch besondere hygienische Sauberkeit sowie optimale Korrosionsbeständigkeit auszeichnet.These measures of the invention have the consequence that the Eccentric screw pump according to the invention only one only rotating plastic unit for power transmission and product promotion is needed. So far an aseptic construction, which is used for the promotion of in particular food and pharmaceutical products is suitable, especially since the eccentric screw pump according to the invention due to the one-piece construction of eccentric screw rotor, Coupling rod and connecting shaft off Plastic through special hygienic cleanliness as well characterized by optimal corrosion resistance.

Überraschen muß die Tatsache, daß die erfindungsgemäße Kunststoffbauweise einerseits eine hinreichende Biegesteifigkeit zum Erzeugen hoher Pumpendrücke bis beispielsweise 24 bar aufweist, andererseits dennoch eine solche Biegeelastizität besitzt, daß die sonst üblichen Gelenkverbindungen zwischen Exzenterschneckenrotor, Kupplungsstange und Verbindungswelle entfallen können und dennoch Gelenkfunktion erreicht wird. Diese Gelenkfunktion wird durch entsprechende, im Querschnitt konkave Einschnürungen zwischen Exzenterschneckenrotor, Kupplungsstange und Verbindungswelle optimiert. Überraschenderweise läßt sich der Exzenterschneckenrotor aus Kunststoff selbst dann verwirklichen, wenn der Exzenterschneckenstator ebenfalls aus Kunststoff besteht, gleichgültig, ob es sich insoweit um ein Elastomer oder einen unelastischen Kunststoff handelt. Das gleiche gilt in bezug auf die Verbindungswelle, welche sich unverändert mittels Gleitringdichtungen gegen das Dichtungsgehäuse abdichten läßt. - Stets wird eine Bauweise verwirklicht, die sich aufgrund des einteiligen Kunststoff-Bauteils für den rotierenden Pumpenstrang durch eine einfache und funktionsgerechte Konstruktion auszeichnet, die darüber hinaus kostengünstig ist.The fact that the invention is surprising Plastic construction on the one hand sufficient bending stiffness for generating high pump pressures up to, for example 24 bar, but still one Bending elasticity has the usual joint connections between eccentric screw rotor, coupling rod and connecting shaft can be omitted and still Joint function is achieved. This joint function will through corresponding constrictions in cross-section between eccentric screw rotor, coupling rod and connecting shaft optimized. Surprisingly, the Eccentric screw rotor made of plastic even then, if the eccentric screw stator is also off There is plastic, regardless of whether it is an elastomer or an inelastic plastic. The same applies to the connecting shaft, which remain unchanged by means of mechanical seals against the Seal housing can be sealed. - Always a construction realized due to the one-piece plastic component for the rotating pump train through a distinguishes simple and functional construction, which is also inexpensive.

Sofern das einteilige Bauteil aus glasfaserverstärktem Kunststoff besteht, läßt sich eine besonders hohe Kraftübertragung ermöglichen und einwandfreie Maßhaltigkeit gewährleisten. Nach einer erfindungsgemäßen Ausführungsform besteht das einteilige Bauteil aus Polyamid, z.B. Polyamid 66. Dieser Kunststoff zeichnet sich durch elastische Steifigkeit, hohe Abriebfestigkeit und Wärmeformbeständigkeit aus, ist darüber hinaus sterilisierbar und besitzt Sperreigenschaften gegen Aromastoffe. Folglich ist dieser Kunststoff besonders für die einteilige Bauweise von Exzenterschneckenrotor, Kupplungsstange und Verbindungswelle geeignet, zumal er in physikalischer und chemischer Hinsicht jene Eigenschaften beinhaltet, welche für den Pumpenstrang eines Exzenterschneckenpumpe benötigt werden, welche zum Fördern von insbesondere Pharma- und Lebensmittelprodukten, aber auch Kosmetikprodukten und Produkten für die Farbenherstellung dient. Nach einer anderen Ausführungsform der Erfindung kann das einteilige Bauteil aber auch aus Polytetrafluorethylen besteht, welches sich durch besondere Schmiereigenschaften auszeichnet. In diesem Fall wird eine Ausführungsform mit einer Graphitfüllung von 10 % bis 15 % bevorzugt.If the one-piece component made of glass fiber reinforced Plastic, there is a particularly high power transmission enable and perfect dimensional accuracy guarantee. According to an embodiment of the invention the one-piece component consists of polyamide, e.g. polyamide 66. This plastic is characterized by elastic Rigidity, high abrasion resistance and heat resistance , is also sterilizable and has Barrier properties against flavorings. Hence this is Plastic especially for the one-piece construction of Eccentric screw rotor, coupling rod and connecting shaft suitable, especially since it is in physical and chemical Regards those properties that are relevant for the Pump line of an eccentric screw pump are required which are used to promote especially pharmaceutical and food products, but also cosmetic products and products is used for paint production. After another Embodiment of the invention can be the one-piece component but also consists of polytetrafluoroethylene, which is characterized by special lubricating properties. In this Case becomes a Embodiment with a graphite filling of 10% to 15% prefers.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Es zeigen:

Fig. 1
eine erfindungsgemäße Exzenterschneckenpumpe in schematischer Darstellung und teilweisem Längsschnitt, und
Fig. 2
einen Pumpenstrang für den Gegenstand nach Fig. 1 aus Exzenterschneckenrotor, Kupplungsstange und Verbindungswelle.
The invention is explained in more detail below with reference to a drawing which represents only one exemplary embodiment. Show it:
Fig. 1
an eccentric screw pump according to the invention in a schematic representation and partial longitudinal section, and
Fig. 2
1 from the eccentric screw rotor, coupling rod and connecting shaft.

In den Figuren ist eine Exzenterschneckenpumpe 1 mit einem in einem Exzenterschneckenstator 2 gelagerten Exzenterschneckenrotor 3, einer in einem an den Exzenterschneckenstator 2 angeschlossenen Sauggehäuse 4 gelagerten Kupplungsstange 5 und mit einer in einem an das Sauggehäuse 4 angeschlossenen Dichtungsgehäuse 6 gelagerten, zu einer Antriebswelle 7 führenden Verbindungswelle 8 dargestellt. Der Pumpenantrieb mit der Antriebswelle 7 ist lediglich angedeutet.In the figures, an eccentric screw pump 1 with a in an eccentric screw stator 2 eccentric screw rotor 3, one in one to the eccentric screw stator 2 connected suction housings 4 stored Coupling rod 5 and one in one to the suction housing 4 connected seal housings 6, to one Drive shaft 7 leading connecting shaft 8 shown. The pump drive with the drive shaft 7 is only indicated.

Der Exzenterschneckenrotor 3, die Kupplungsstange 5 und die Verbindungswelle 8 sind als einteiliges Bauteil aus thermoplastischem Kunststoff ausgeführt. Das Kunststoff-Bauteil weist in den Übergangsbereichen von dem Exzenterschneckenrotor 3 zu der Kupplungsstange 5 und von der Kupplungsstange 5 zu der Verbindungswelle 8 Durchmesserreduzierungen auf, welche die in diesen Bereichen sonst erforderlichen Gelenkverbindungen ersetzen. Nach dem Ausführungsbeispiel handelt es sich bei diesen Durchmesserreduzierungen aus im Querschnitt konkave Einschnürungen 9. Das einteilige Kunststoff-Bauteil 3, 5, 8 kann aus glasfaserverstärktem Kunststoff bestehen, um die Kraftübertragung einerseits und die Maßhaltigkeit dieses rotierenden Pumpenstranges andererseits zu optimieren. Nach dem Ausführungsbeispiel besteht das einteilige Kunststoff-Bauteil 3, 5, 8 aus Polyamid, nämlich Polyamid 66 und läßt sich unschwer im Spritzgußverfahren herstellen. Darüber hinaus ist selbst eine spanende Bearbeitung und die Einhaltung feinster Toleranzen möglich.The eccentric screw rotor 3, the coupling rod 5 and the Connecting shaft 8 are made as a one-piece component thermoplastic plastic. The plastic component points in the transition areas from the Eccentric screw rotor 3 to the coupling rod 5 and from the coupling rod 5 to the connecting shaft 8 diameter reductions on what else in these areas replace the required articulated connections. After this The exemplary embodiment concerns these diameter reductions from concave cross-sections 9. The one-piece plastic component 3, 5, 8 can be made of glass fiber reinforced Plastic consist of the power transmission on the one hand and the dimensional accuracy of this on the other hand to optimize the rotating pump line. To the embodiment consists of the one-piece plastic component 3, 5, 8 made of polyamide, namely polyamide 66 and leaves easily manufactured by injection molding. About that is also a machining and the Compliance with the finest tolerances possible.

Claims (8)

  1. An eccentric screw pump (1), with an eccentric screw rotor (3) mounted in an eccentric screw stator (2), further with a coupling rod (5) mounted in a suction casing (4) connected to the eccentric screw stator (2), and with a connection shaft (8) leading to a drive shaft (7), whereby the eccentric screw rotor (3), the coupling rod (5) and the connection shaft (8) are designed as a one-piece component (3, 5, 8) made of a thermoplastic synthetic material, characterised in that
    the one-piece component (3, 5, 8) has link-forming constrictions (9) in the form of diameter reductions in the transition regions from the eccentric screw rotor (3) to the coupling rod (5) and from the coupling rod (5) to the connection shaft (8) respectively.
  2. The eccentric screw pump (1) according to claim 1, characterised in that the whole region of the coupling rod (5) serves as a link and is correspondingly constricted.
  3. The eccentric screw pump (1) according to claim 1 or 2, characterised in that the connection shaft (8) is mounted in a sealing casing (6) connected to the suction casing (4).
  4. The eccentric screw pump (1) according to any one of claims 1 to 3, characterised in that the one-piece component (3, 5, 8) is made of glass-fibre reinforced plastic.
  5. The eccentric screw pump (1) according to any one of claims 1 to 4, characterised in that the one-piece component (3, 5, 8) is made of polyamide, e.g. polyamide 66.
  6. The eccentric screw pump (1) according to any one of claims 1 to 5, characterised in that the one-piece component (3, 5, 8) is made of polytetrafluoroethylene.
  7. The eccentric screw pump (1) according to any one of claims 1 to 6, characterised in that the one-piece component (3, 5, 8) made of polytetrafluoroethylene has a graphite filling of 10 % to 15 %.
  8. The eccentric screw pump (1) according to any one of claims 1 to 7, characterised in that the link-forming constrictions (9) are designed as concave diameter reductions.
EP99103358A 1998-03-28 1999-02-20 Moineau pump Expired - Lifetime EP0947700B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813999A DE19813999C1 (en) 1998-03-28 1998-03-28 Eccentric screw pump
DE19813999 1998-03-28

Publications (2)

Publication Number Publication Date
EP0947700A1 EP0947700A1 (en) 1999-10-06
EP0947700B1 true EP0947700B1 (en) 2004-01-28

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EP99103358A Expired - Lifetime EP0947700B1 (en) 1998-03-28 1999-02-20 Moineau pump

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US (1) US6155807A (en)
EP (1) EP0947700B1 (en)
JP (1) JPH11311187A (en)
CN (1) CN1162622C (en)
AT (1) ATE258651T1 (en)
CA (1) CA2264361A1 (en)
DE (2) DE19813999C1 (en)

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CN1162622C (en) 2004-08-18
DE59908390D1 (en) 2004-03-04
US6155807A (en) 2000-12-05
ATE258651T1 (en) 2004-02-15
EP0947700A1 (en) 1999-10-06
DE19813999C1 (en) 1999-11-25
JPH11311187A (en) 1999-11-09
CA2264361A1 (en) 1999-09-28
CN1233714A (en) 1999-11-03

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