WO2011069754A2 - Eccentric screw pump - Google Patents

Eccentric screw pump Download PDF

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Publication number
WO2011069754A2
WO2011069754A2 PCT/EP2010/066705 EP2010066705W WO2011069754A2 WO 2011069754 A2 WO2011069754 A2 WO 2011069754A2 EP 2010066705 W EP2010066705 W EP 2010066705W WO 2011069754 A2 WO2011069754 A2 WO 2011069754A2
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
eccentric screw
screw pump
pump according
mixing element
Prior art date
Application number
PCT/EP2010/066705
Other languages
German (de)
French (fr)
Other versions
WO2011069754A3 (en
Inventor
Klaus Kümmerle
Original Assignee
Putzmeister Mörtelmaschinen 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 Putzmeister Mörtelmaschinen GmbH filed Critical Putzmeister Mörtelmaschinen GmbH
Publication of WO2011069754A2 publication Critical patent/WO2011069754A2/en
Publication of WO2011069754A3 publication Critical patent/WO2011069754A3/en

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/111—Centrifugal stirrers, i.e. stirrers with radial outlets; Stirrers of the turbine type, e.g. with means to guide the flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/2123—Shafts with both stirring means and feeding or discharging means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/1238—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices
    • B28C5/1292—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices with rotating stirring and feeding or discharging means fixed on the same axis, e.g. in an inclined container fed at its lower part
    • 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
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0721—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis parallel with respect to the rotating axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0724—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis directly mounted on the rotating axis

Definitions

  • the invention relates to an eccentric screw pump for the conveyance of fluids, in particular of liquid mortar, comprising a stator consisting of an elastomer, a pump cavity shaped in the manner of a double or multi-start helical thread, and a motor-driven pump chamber having a radial eccentricity.
  • NEN shaped like a helical rotor, wherein the pump cavity of the stator has a thread more than the rotor.
  • Eccentric screw pumps of this type are suitable for use in mixing pumps for mixing and conveying mortars due to their simple construction.
  • the progressing cavity pump is preceded on the suction side by a mixer in which mortar and water are mixed with one another before they are subjected to pressure conveyance as liquid mortar via the eccentric screw pump.
  • mixing pumps of this type in the limited mixing time and the limited mixing speed no good mixing quality is achieved.
  • Building site mortar passes through the mixer for only a few seconds, whereby the effect of additives is not fully developed and the air pore content remains low.
  • plaster mortars however, a high air entrainment is desired, which ensures a higher yield and better processability and promises improved elasticity and insulation in the cured state.
  • the present invention seeks to improve the known eccentric screw pump of the type specified in that a better mixing quality can be achieved with increased air entrainment in the funding.
  • the feature combination specified in claim 1 is proposed.
  • the solution according to the invention is based on the idea that with the aid of a post-mixer, which is coupled directly to the eccentric screw pump, an improved mixing quality and an increased proportion of air pores can be achieved.
  • the pump cavity opens at the pressure-side end of the stator into a mixing chamber into which a mixing element which is non-rotatably connected to the rotor engages.
  • the mixing chamber is expediently formed in the pressure-side end of the stator, while the mixing element is advantageously positively and non-positively plugged onto the rotor.
  • a preferred embodiment of the invention provides that the mixing element is attached to a pressure-side over the rotor projecting rotary drive pin. This ensures that the mixing element rotates in the mixing chamber with the eccentricity of the rotor.
  • a further advantageous embodiment of the invention provides that the mixing element is equipped with turbine blades to form a turbine insert.
  • the turbine blades of the turbine insert are expediently directed against the flow direction of the fluid for a given direction of rotation of the rotor.
  • the pumped fluid is mixed effectively and the air entrainment increased.
  • the increased proportion of air pores stands for a better yield and processability of mortar.
  • the mixing element may be equipped to form a star wheel or gear insert with star or tooth ribs. Furthermore, the star or tooth ribs of the mixing element can rotate in the direction of rotation of the mixing element. tors leading slope, which leads to an improvement of the mixing result.
  • FIG. 1 shows a longitudinal section through an eccentric screw pump with integrated post-mixer.
  • FIG. 2a shows a longitudinal section through the pump housing with the stator of the eccentric screw pump according to FIG. 1;
  • FIG. 2b shows an exploded view of the rotor of the eccentric screw pump according to FIG. 1;
  • FIG. 3a shows a rotor modified with respect to FIG. 2b with a mixing insert designed as a turbine insert
  • FIG. 3b shows the mixing insert of FIG. 3a designed as a turbine insert in an enlarged view
  • FIG. 4a to c three further embodiments of a trained as a star insert mixing element in perspective view; 5a shows a longitudinal section through the pump housing with stator of a modified embodiment of the eccentric screw pump.
  • Fig. 5b is a plan view of the pump housing with stator of FIG.
  • FIG. 6 shows a side view of a rotor for use in the pump housing according to FIG. 5a;
  • Fig. 6a to d cross sections through the rotor of FIG. 6;
  • Fig. 6e is a partial section of the rotor of Fig. 6; 7a to e are a plan view, a bottom view, a sectional view and two perspective views of a formed as a turbine insert modified mixing insert for the rotor of FIG. 6th
  • the eccentric screw pump shown in the drawing is intended primarily for use in mixing pumps for construction site mortar.
  • the eccentric screw pump shown in Fig. 1 comprises a rotatably and non-rotatably mounted in a tubular pump housing 10 of steel stator 12 made of an elastomeric material, such as rubber, the inner surface of which has a shaped like a two- or multi-start helix 20 pump cavity 14.
  • a rotor 16 is provided, which is driven by a motor via the suction-side connection coupling 18 and engages the pump cavity 14 with its section of radial eccentricity e shaped in the manner of a helical thread 22.
  • the pump cavity 14 has a thread more than the rotor 16.
  • the rotor 16 When pumping the rotor 16 rolls with its coiled portion on the coiled inside of the stator 12 from.
  • the rotor 16 performs with its axis 24 is an eccentric rotation about the longitudinal axis 26 of the stator 14.
  • the geometry of the rotor 16 and the pump cavity 14 are coordinated so that divided spaces arise which move during the eccentric rotation of the rotor 16 in the axial direction and the medium contained therein take along (see Fig. 1).
  • the shear forces on the fluid are so small that even sensitive material is pumped and not destroyed. It follows that no mixing effect is achieved during the pumping process.
  • a special feature of the invention is that the pump cavity 14 of the stator 12 opens at the pressure-side end into a mixing chamber 28, which is arranged concentrically to the stator axis 26, and that the rotor 16 carries at its pressure-side end a mixing element 30 engaging in the mixing chamber 28, which is rotatable together with the rotor 16 about the rotor axis 24.
  • the mixing chamber 28 is formed in the pressure-side end of the stator in the manner of a blind hole, while the mixing element 30 is positively and non-positively attached to the rotor 16.
  • the rotor 16 has an axially projecting rotational drive pin 32, onto which the mixing element 30 can be plugged with an opening 34 complementary to the outline shape of the rotary drive pin.
  • the rotor-side rotational drive pin 32 and the mixing element-side opening 34 have a substantially square or rectangular outline.
  • the mixing elements 30 are formed as star wheel or gear inserts, which are equipped with star or toothed ribs 36 with different numbers and design.
  • the toothed ribs 36 additionally have a roof slope 38 leading in the direction of rotation 37 of the rotor 16.
  • the mixing element 30 is designed as a turbine insert, which is equipped with turbine blades 40. The turbine blades 40 counteract the direction of flow of the pumped medium and ensure good mixing with a high proportion of air voids.
  • FIGS. 5a to 7e which show the components of a modified eccentric screw pump
  • a special feature is that the rotor 16 carries a rotational drive pin 32 which at the same time forms a bayonet lock 42 for the mixing element 30 designed as a turbine insert and provided with a keyed opening 44 ,
  • the mixing element 30 is placed in this case with the key hole 44 on rotational drive pin 32 and then fixed by 90 ° counter to the direction of rotation on the rotor 16.
  • the invention relates to an eccentric screw pump for the delivery of thick matter, in particular of liquid mortar.
  • the eccentric screw pump comprises a stator 12 made of an elastomer, having a pump cavity 14 shaped like a two or more coarse thread 20, and a motor-driven rotor 16 with a radial eccentricity e, engaging the pump cavity 14 in the manner of a coarse thread 22
  • Pump cavity 14 of the stator 12 in this case has a thread more than the rotor 16.
  • the pump cavity 14 opens at the pressure-side end of the stator 12 into a mixing chamber 28 into which a mixing element 30 connected in a rotationally fixed manner to the rotor 16 engages.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The invention relates to an eccentric screw pump for conveying high-viscosity materials, in particular liquid mortar. The eccentric screw pump according to the invention comprises a stator (12) made of an elastomer and having a pump hollow chamber (14) formed in the manner of a double- or multi-pitch thread (20) and a motorized rotor (16) having radial eccentricity (e) and reaching through the pump hollow chamber (14) and formed in the manner of a pitch thread (22). The pump hollow chamber (14) of the stator (12) has one thread more than the rotor (16). In order to obtain a good mix having a high air pore ratio, according to the invention the pump hollow space (14) opens on the pressure side end of the stator (12) in a mixing chamber (28) in which a mixing element (30) which is connected to the rotor (16) in a rotationally fixed manner engages.

Description

Exzenterschneckenpumpe Beschreibung Die Erfindung betrifft eine Exzenterschneckenpumpe für die Förderung von Fluiden, insbesondere von Flüssigmörtel, mit einem aus einem Elastomer bestehenden, einen nach Art eines zwei- oder mehrgängigen Steilgewindes geformten Pumpenhohlraum aufweisenden Stator und mit einem mit radialer Exzentrizität den Pumpenhohlraum durchgreifenden, motorisch angetriebe- nen, nach Art eines Steilgewindes geformten Rotor, wobei der Pumpenhohlraum des Stators einen Gewindegang mehr als der Rotor aufweist.  The invention relates to an eccentric screw pump for the conveyance of fluids, in particular of liquid mortar, comprising a stator consisting of an elastomer, a pump cavity shaped in the manner of a double or multi-start helical thread, and a motor-driven pump chamber having a radial eccentricity. NEN, shaped like a helical rotor, wherein the pump cavity of the stator has a thread more than the rotor.
Exzenterschneckenpumpen dieser Art eignen sich wegen ihres einfachen Aufbaus für den Einsatz in Mischpumpen zum Mischen und Fördern von Mörteln. Der Exzenterschneckenpumpe ist dort saugseitig ein Mischer vorgeschaltet, in welchem Mörtel und Wasser miteinander gemischt werden, bevor sie als Flüssigmörtel über die Exzenterschneckenpumpe einer Druckförderung ausgesetzt werden. An sich wird bei Mischpumpen dieser Art in der begrenzten Mischzeit und der limitierten Mischdrehzahl keine gute Mischqualität erreicht. Baustellenmörtel läuft nur wenige Sekunden durch den Mischer, wodurch die Wirkung von Zusatzmitteln nicht voll entfaltet wird und der Luftporengehalt gering bleibt. Vor allem bei Putzmörteln ist jedoch ein hoher Luftporenanteil erwünscht, der eine größere Ergiebigkeit und bessere Verarbeitbarkeit gewährleistet und eine verbesserte Elastizität und Iso- lation im ausgehärteten Zustand verspricht. Eccentric screw pumps of this type are suitable for use in mixing pumps for mixing and conveying mortars due to their simple construction. The progressing cavity pump is preceded on the suction side by a mixer in which mortar and water are mixed with one another before they are subjected to pressure conveyance as liquid mortar via the eccentric screw pump. As such, in mixing pumps of this type in the limited mixing time and the limited mixing speed no good mixing quality is achieved. Building site mortar passes through the mixer for only a few seconds, whereby the effect of additives is not fully developed and the air pore content remains low. Especially in plaster mortars, however, a high air entrainment is desired, which ensures a higher yield and better processability and promises improved elasticity and insulation in the cured state.
Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, die bekannte Exzenterschneckenpumpe der eingangs angegebenen Art dahingehend zu verbessern, dass eine bessere Mischqualität mit erhöhtem Luftporenanteil im Fördermittel erzielt werden kann. Zur Lösung dieser Aufgabe wird die im Patentanspruch 1 angegebene Merkmalskombination vorgeschlagen. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen. Proceeding from this, the present invention seeks to improve the known eccentric screw pump of the type specified in that a better mixing quality can be achieved with increased air entrainment in the funding. To solve this problem, the feature combination specified in claim 1 is proposed. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.
Die erfindungsgemäße Lösung geht von dem Gedanken aus, dass mit Hilfe eines Nachmischers, der unmittelbar an die Exzenterschneckenpumpe angekoppelt ist, eine verbesserte Mischqualität und ein erhöhter Luftporenanteil erzielt werden kann. Um dies zu erreichen, wird gemäß der Erfindung vorgeschlagen, dass der Pumpenhohlraum am druckseitigen Ende des Stators in eine Mischkammer mündet, in welche ein drehfest mit dem Rotor verbundenes Mischelement eingreift. Die Mischkammer ist dabei zweckmäßig in das druckseitige Ende des Stators eingeformt, während das Mischelement vorteilhafterweise form- und kraftschlüssig auf den Rotor aufgesteckt ist. The solution according to the invention is based on the idea that with the aid of a post-mixer, which is coupled directly to the eccentric screw pump, an improved mixing quality and an increased proportion of air pores can be achieved. To achieve this, it is proposed according to the invention that the pump cavity opens at the pressure-side end of the stator into a mixing chamber into which a mixing element which is non-rotatably connected to the rotor engages. The mixing chamber is expediently formed in the pressure-side end of the stator, while the mixing element is advantageously positively and non-positively plugged onto the rotor.
Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass das Mischelement auf einen druckseitig über den Rotor überstehenden Drehmitnahmezapfen aufgesteckt ist. Dadurch wird erreicht, dass das Mischelement in der Mischkammer mit der Exzentrizität des Rotors umläuft. A preferred embodiment of the invention provides that the mixing element is attached to a pressure-side over the rotor projecting rotary drive pin. This ensures that the mixing element rotates in the mixing chamber with the eccentricity of the rotor.
Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, das Mischelement unter Bildung eines Turbineneinsatzes mit Turbinenschaufeln bestückt ist. Die Turbinenschaufeln des Turbineneinsatzes sind zweckmäßig bei gegebener Drehrichtung des Rotors entgegen der Strömungsrichtung des Fluids gerichtet. Dadurch wird das gepumpte Fluid wirksam aufgemischt und der Luftporenanteil erhöht. Der erhöhte Luftporenanteil steht für eine bessere Ergiebigkeit und Verarbeitbarkeit von Mörtel. A further advantageous embodiment of the invention provides that the mixing element is equipped with turbine blades to form a turbine insert. The turbine blades of the turbine insert are expediently directed against the flow direction of the fluid for a given direction of rotation of the rotor. As a result, the pumped fluid is mixed effectively and the air entrainment increased. The increased proportion of air pores stands for a better yield and processability of mortar.
Alternativ hierzu kann das Mischelement unter Bildung eines Sternrad- oder Zahnradeinsatzes mit Stern- oder Zahnrippen bestückt sein. Weiter können die Stern- oder Zahnrippen des Mischelements eine in Drehrichtung des Ro- tors vorauseilende Dachschräge aufweisen, die zu einer Verbesserung des Mischergebnisses führt. Alternatively, the mixing element may be equipped to form a star wheel or gear insert with star or tooth ribs. Furthermore, the star or tooth ribs of the mixing element can rotate in the direction of rotation of the mixing element. tors leading slope, which leads to an improvement of the mixing result.
Ein wesentlicher Vorteil der Erfindung besteht darin, dass der erfindungs- gemäße Nachmischer unmittelbar in der Exzenterschneckenpumpe integriert ist. Es bedarf daher keines Umbaus an einer Mischpumpe oder gar des Einbaus des Mischers in die nachfolgende Schlauchleitung, wie dies an sich bekannt ist. Im Folgenden wird die Erfindung anhand der in der Zeichnung in schemati- scher Weise dargestellten Ausführungsbeispiele näher erläutert. Es zeigen An essential advantage of the invention is that the post-mixer according to the invention is integrated directly in the eccentric screw pump. It therefore requires no conversion to a mixing pump or even the installation of the mixer in the subsequent tubing, as is well known. In the following the invention will be explained in more detail with reference to the embodiments schematically illustrated in the drawing. Show it
Fig. 1 einen Längsschnitt durch eine Exzenterschneckenpumpe mit integriertem Nachmischer; 1 shows a longitudinal section through an eccentric screw pump with integrated post-mixer.
Fig. 2a einen Längsschnitt durch das Pumpengehäuse mit Stator der Exzenterschneckenpumpe gemäß Fig. 1 ; FIG. 2a shows a longitudinal section through the pump housing with the stator of the eccentric screw pump according to FIG. 1; FIG.
Fig. 2b eine Explosionsdarstellung des Rotors der Exzenterschnecken- pumpe nach Fig. 1 ; FIG. 2b shows an exploded view of the rotor of the eccentric screw pump according to FIG. 1; FIG.
Fig. 3a einen gegenüber Fig. 2b abgewandelten Rotor mit einem als Turbineneinsatz ausgebildeten Mischeinsatz; Fig. 3b den als Turbineneinsatz ausgebildeten Mischeinsatz nach Fig. 3a in vergrößerter Darstellung; FIG. 3a shows a rotor modified with respect to FIG. 2b with a mixing insert designed as a turbine insert; FIG. FIG. 3b shows the mixing insert of FIG. 3a designed as a turbine insert in an enlarged view; FIG.
Fig. 4a bis c drei weitere Ausführungsbeispiele eines als Sterneinsatz ausgebildeten Mischelements in schaubildlicher Darstellung; Fig. 5a einen Längsschnitt durch das Pumpengehäuse mit Stator eines abgewandelten Ausführungsbeispiels der Exzenterschneckenpumpe; Fig. 5b eine Draufsicht auf das Pumpengehäuse mit Stator gemäß Fig. 4a to c three further embodiments of a trained as a star insert mixing element in perspective view; 5a shows a longitudinal section through the pump housing with stator of a modified embodiment of the eccentric screw pump. Fig. 5b is a plan view of the pump housing with stator of FIG.
5a;  5a;
Fig. 6 eine Seitenansicht eines Rotors für den Einsatz in das Pumpengehäuse gemäß Fig. 5a; 6 shows a side view of a rotor for use in the pump housing according to FIG. 5a;
Fig. 6a bis d Querschnitte durch den Rotor gemäß Fig. 6; Fig. 6a to d cross sections through the rotor of FIG. 6;
Fig. 6e einen Teilschnitt des Rotors nach Fig. 6; Fig. 7a bis e eine Draufsicht, eine Untenansicht, ein Schnittbild und zwei schaubildliche Darstellungen eines als Turbineneinsatz ausgebildeten abgewandelten Mischeinsatzes für den Rotor nach Fig. 6. Fig. 6e is a partial section of the rotor of Fig. 6; 7a to e are a plan view, a bottom view, a sectional view and two perspective views of a formed as a turbine insert modified mixing insert for the rotor of FIG. 6th
Die in der Zeichnung dargestellte Exzenterschneckenpumpe ist vor allem für den Einsatz in Mischpumpen für Baustellenmörtel bestimmt. Die in Fig. 1 gezeigte Exzenterschneckenpumpe umfasst eine in einem rohrförmigen Pumpengehäuse 10 aus Stahl dreh- und verschiebefest angeordneten Stator 12 aus einem elastomeren Material, wie Gummi, dessen Innenfläche einen nach Art eines zwei- oder mehrgängigen Steilgewindes 20 geformten Pumpenhohlraum 14 aufweist. Weiter ist ein Rotor 16 vorgesehen, der über die saugseitige Anschlusskupplung 18 motorisch antreibbar ist und mit seiner nach Art eines Steilgewindes 22 geformten Partie mit radialer Exzentrizität e den Pumpenhohlraum 14 durchgreift. Der Pumpenhohlraum 14 weist dabei einen Gewindegang mehr als der Rotor 16 auf. Beim Pumpbetrieb wälzt sich der Rotor 16 mit seiner gewendelten Partie auf der gewendelten Innenseite des Stators 12 ab. Dabei vollführt der Rotor 16 mit seiner Achse 24 eine exzentrische Drehung um die Längsachse 26 des Stators 14. Die Geometrie des Rotors 16 und des Pumpenhohlraums 14 sind so aufeinander abgestimmt, dass abgeteilte Räume entstehen, die sich während der exzentrischen Drehbewegung des Rotors 16 in axialer Richtung bewegen und dar- in enthaltenes Medium mitnehmen (s. Fig. 1 ). Die Scherkräfte auf das Fördermedium sind dabei so klein, dass auch sensibles Fördergut gepumpt und nicht zerstört wird. Hieraus ergibt sich, dass beim Pumpvorgang keine Mischwirkung erzielt wird. Eine Besonderheit der Erfindung besteht darin, dass der Pumpenhohlraum 14 des Stators 12 am druckseitigen Ende in eine Mischkammer 28 mündet, die konzentrisch zur Statorachse 26 angeordnet ist, und dass der Rotor 16 an seinem druckseitigen Ende ein in die Mischkammer 28 eingreifendes Mischelement 30 trägt, das zusammen mit dem Rotor 16 um die Rotorachse 24 drehbar ist. Die Mischkammer 28 ist in das druckseitige Ende des Stators nach Art einer Sacklochbohrung eingeformt, während das Mischelement 30 form- und kraftschlüssig auf den Rotor 16 aufgesteckt ist. Der Rotor 16 weist zu diesem Zweck einen axial überstehenden Drehmitnahmezapfen 32 auf, auf welchen das Mischelement 30 mit einer zur Umrissgestalt des Drehmit- nahmezapfens komplementären Öffnung 34 aufsteckbar ist. Bei den in der Zeichnung dargestellten Ausführungsbeispielen weisen der rotorseitige Drehmitnahmezapfen 32 und die mischelementseitige Öffnung 34 einen im wesentlichen quadratischen oder rechteckigen Umriss auf. Bei den Ausführungsbeispielen nach Fig. 1 , 2b und 4a bis c sind die Mischelemente 30 als Sternrad- oder Zahnradeinsätze ausgebildet, die mit Sternoder Zahnrippen 36 mit unterschiedlicher Anzahl und Bauform bestückt sind. Bei dem Ausführungsbeispiel nach Fig. 4c weisen die Zahnrippen 36 zusätzlich eine in Drehrichtung 37 des Rotors 16 vorauseilende Dachschräge 38 auf. lm Ausführungsbeispiel nach Fig. 3a und b ist das Mischelement 30 als Turbineneinsatz ausgebildet, der mit Turbinenschaufeln 40 bestückt ist. Die Turbinenschaufeln 40 wirken der Strömungsrichtung des Fördermediums entgegen und sorgen für eine gute Durchmischung mit hohem Luftporenan- teil. The eccentric screw pump shown in the drawing is intended primarily for use in mixing pumps for construction site mortar. The eccentric screw pump shown in Fig. 1 comprises a rotatably and non-rotatably mounted in a tubular pump housing 10 of steel stator 12 made of an elastomeric material, such as rubber, the inner surface of which has a shaped like a two- or multi-start helix 20 pump cavity 14. Further, a rotor 16 is provided, which is driven by a motor via the suction-side connection coupling 18 and engages the pump cavity 14 with its section of radial eccentricity e shaped in the manner of a helical thread 22. The pump cavity 14 has a thread more than the rotor 16. When pumping the rotor 16 rolls with its coiled portion on the coiled inside of the stator 12 from. In this case, the rotor 16 performs with its axis 24 is an eccentric rotation about the longitudinal axis 26 of the stator 14. The geometry of the rotor 16 and the pump cavity 14 are coordinated so that divided spaces arise which move during the eccentric rotation of the rotor 16 in the axial direction and the medium contained therein take along (see Fig. 1). The shear forces on the fluid are so small that even sensitive material is pumped and not destroyed. It follows that no mixing effect is achieved during the pumping process. A special feature of the invention is that the pump cavity 14 of the stator 12 opens at the pressure-side end into a mixing chamber 28, which is arranged concentrically to the stator axis 26, and that the rotor 16 carries at its pressure-side end a mixing element 30 engaging in the mixing chamber 28, which is rotatable together with the rotor 16 about the rotor axis 24. The mixing chamber 28 is formed in the pressure-side end of the stator in the manner of a blind hole, while the mixing element 30 is positively and non-positively attached to the rotor 16. For this purpose, the rotor 16 has an axially projecting rotational drive pin 32, onto which the mixing element 30 can be plugged with an opening 34 complementary to the outline shape of the rotary drive pin. In the embodiments shown in the drawing, the rotor-side rotational drive pin 32 and the mixing element-side opening 34 have a substantially square or rectangular outline. In the embodiments of FIGS. 1, 2b and 4a to c, the mixing elements 30 are formed as star wheel or gear inserts, which are equipped with star or toothed ribs 36 with different numbers and design. In the embodiment according to FIG. 4 c, the toothed ribs 36 additionally have a roof slope 38 leading in the direction of rotation 37 of the rotor 16. In the exemplary embodiment according to FIGS. 3 a and b, the mixing element 30 is designed as a turbine insert, which is equipped with turbine blades 40. The turbine blades 40 counteract the direction of flow of the pumped medium and ensure good mixing with a high proportion of air voids.
Bei den Figuren 5a bis 7e, welche die Bauteile einer abgewandelten Exzenterschneckenpumpe zeigen, besteht eine Besonderheit darin, dass der Rotor 16 einen Drehmitnahmezapfen 32 trägt, der zugleich einen Bajonettver- schluss 42 für das als Turbineneinsatz ausgebildete, mit einer Schlüsselöffnung 44 versehene Mischelement 30 bildet. Das Mischelement 30 wird in diesem Fall mit der Schlüsselöffnung 44 auf Drehmitnahmezapfen 32 aufgesetzt und anschließend um 90° entgegen der Drehrichtung am Rotor 16 fixiert. In FIGS. 5a to 7e, which show the components of a modified eccentric screw pump, a special feature is that the rotor 16 carries a rotational drive pin 32 which at the same time forms a bayonet lock 42 for the mixing element 30 designed as a turbine insert and provided with a keyed opening 44 , The mixing element 30 is placed in this case with the key hole 44 on rotational drive pin 32 and then fixed by 90 ° counter to the direction of rotation on the rotor 16.
Zusammenfassend ist folgendes festzuhalten: Die Erfindung betrifft eine Exzenterschneckenpumpe für die Förderung von Dickstoffen, insbesondere von Flüssigmörtel. Die Exzenterschneckenpumpe umfasst einen aus einem Elastomer bestehenden, einen nach Art eines zwei- oder mehrgängigen Steilgewindes 20 geformten Pumpenhohlraum 14 aufweisenden Stator 12, und einen mit radialer Exzentrizität e den Pumpenhohlraum 14 durchgreifenden, motorisch angetriebenen, nach Art eines Steilgewindes 22 geformten Rotor 16. Der Pumpenhohlraum 14 des Stators 12 weist dabei einen Gewindegang mehr als der Rotor 16 auf. Um eine gute Durchmischung mit hohem Luftporenanteil zu erhalten, wird gemäß der Erfindung vorgeschlagen, dass der Pumpenhohlraum 14 am druckseitigen Ende des Stators 12 in eine Mischkammer 28 mündet, in welche ein drehfest mit dem Rotor 16 verbundenes Mischelement 30 eingreift. Bezugszeichenliste: In summary, the following should be noted: The invention relates to an eccentric screw pump for the delivery of thick matter, in particular of liquid mortar. The eccentric screw pump comprises a stator 12 made of an elastomer, having a pump cavity 14 shaped like a two or more coarse thread 20, and a motor-driven rotor 16 with a radial eccentricity e, engaging the pump cavity 14 in the manner of a coarse thread 22 Pump cavity 14 of the stator 12 in this case has a thread more than the rotor 16. In order to obtain a good mixing with a high proportion of air pores, it is proposed according to the invention that the pump cavity 14 opens at the pressure-side end of the stator 12 into a mixing chamber 28 into which a mixing element 30 connected in a rotationally fixed manner to the rotor 16 engages. LIST OF REFERENCE NUMBERS
10 Pumpengehäuse10 pump housings
12 Stator 12 stators
14 Pumpen hohl räum 14 pumps hollow cavities
16 Rotor 16 rotor
18 Anschlusskupplung 18 connection coupling
20 Steilgewinde Stator20 coarse thread stator
22 Steilgewinde Rotor22 steep thread rotor
24 Rotorachse 24 rotor axis
26 Statorachse  26 stator axis
28 Mischkammer 28 mixing chamber
30 Mischelement30 mixing element
32 Drehmitnahmezapfen32 rotary driving pin
34 Öffnung 34 opening
36 Zahnrippen  36 dental ribs
37 Drehrichtung  37 direction of rotation
38 Dachschräge  38 pitched roof
40 Turbinenschaufeln 40 turbine blades
42 Bajonettverschluss42 bayonet lock
44 Schlüsselöffnung 44 key opening

Claims

Patentansprüche claims
Exzenterschneckenpumpe für die Förderung von Fluiden, insbesondere von Flüssigmörtel, mit einem aus einem Elastomer bestehenden, einen nach Art eines zwei- oder mehrgängigen Steilgewindes (20) geformten Pumpenhohlraum (14) aufweisenden Stator (12), und mit einem mit radialer Exzentrizität (e) den Pumpenhohlraum (14) durchgreifenden, motorisch angetriebenen, nach Art eines Steilgewindes (22) geformten Rotor (16), dadurch gekennzeichnet, dass der Pumpenhohlraum (14) am druckseitigen Ende des Stators (12) in eine Mischkammer (28) mündet, in welche ein drehfest mit dem Rotor (16) verbundenes Mischelement (30) eingreift. Eccentric screw pump for the conveyance of fluids, in particular liquid mortar, comprising a stator (12) made of an elastomer, a pump cavity (14) shaped like a double or multi-flight coarse thread (20), and having a radial eccentricity (e) the pump cavity (14) passing, motor-driven, like a helical thread (22) shaped rotor (16), characterized in that the pump cavity (14) at the pressure end of the stator (12) opens into a mixing chamber (28), in which a rotationally fixed with the rotor (16) connected to the mixing element (30) engages.
Exzenterschneckenpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass die Mischkammer (28) in das druckseitige Ende des Stators (12) eingeformt ist. Eccentric screw pump according to claim 1, characterized in that the mixing chamber (28) in the pressure-side end of the stator (12) is formed.
Exzenterschneckenpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Mischelement (30) form- und kraftschlüssig auf den Rotor (16) aufgesteckt ist. Eccentric screw pump according to claim 1 or 2, characterized in that the mixing element (30) is positively and non-positively attached to the rotor (16).
4. Exzenterschneckenpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Mischelement (30) auf einen druckseitig über den Rotor (16) überstehenden Drehmitnahmezapfen (32) aufge- steckt ist. 4. Eccentric screw pump according to one of claims 1 to 3, characterized in that the mixing element (30) on a pressure side over the rotor (16) protruding rotational drive pin (32) is plugged.
5. Exzenterschneckenpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Mischelement (30) unter Bildung eines Turbineneinsatzes mit Turbinenschaufeln (40) bestückt ist. 5. Eccentric screw pump according to one of claims 1 to 4, characterized in that the mixing element (30) is equipped to form a turbine insert with turbine blades (40).
6. Exzenterschneckenpumpe nach Anspruch 5, dadurch gekennzeichnet, dass die Turbinenschaufeln (40) des Turbineneinsatzes bei gegebener Drehrichtung (37) des Rotors (16) entgegen der Strömungsrich- tung des Fluides gerichtet sind. 6. Eccentric screw pump according to claim 5, characterized in that the turbine blades (40) of the turbine insert for a given direction of rotation (37) of the rotor (16) are directed against the flow direction of the fluid.
7. Exzenterschneckenpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Mischelement (30) unter Bildung eines Sternrad- oder Zahnradeinsatzes mit Stern- oder Zahnrippen (36) bestückt ist. 7. Eccentric screw pump according to one of claims 1 to 4, characterized in that the mixing element (30) is equipped to form a star wheel or gear insert with star or toothed ribs (36).
8. Exzenterschneckenpumpe nach Anspruch 7, dadurch gekennzeichnet, dass die Zahnrippen (36) eine in Drehrichtung (37) des Rotors (16) vorauseilende Dachschräge (38) aufweisen. 8. Eccentric screw pump according to claim 7, characterized in that the toothed ribs (36) in the direction of rotation (37) of the rotor (16) vorseilende roof pitch (38).
9. Exzenterschneckenpumpe nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Mischelement (30) in der Mischkammer (28) mit der Exzentrizität (e) des Rotors (16) umläuft. 9. Eccentric screw pump according to one of claims 1 to 8, characterized in that the mixing element (30) in the mixing chamber (28) with the eccentricity (e) of the rotor (16) rotates.
10. Exzenterschneckenpumpe nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das Mischelement (30) an dem Rotor (16) gegen axiale Verschiebung gesichert ist. 10. Eccentric screw pump according to one of claims 1 to 9, characterized in that the mixing element (30) is secured to the rotor (16) against axial displacement.
1 1 . Exzenterschneckenpumpe nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass das Mischelement (30) mit einem Bajo- nettverschluss (42) am Rotor (16) fixiert ist. 1 1. Eccentric screw pump according to one of claims 1 to 10, characterized in that the mixing element (30) with a Bajo net closure (42) is fixed to the rotor (16).
PCT/EP2010/066705 2009-12-09 2010-11-03 Eccentric screw pump WO2011069754A2 (en)

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DE102009047717A DE102009047717A1 (en) 2009-12-09 2009-12-09 Cavity Pump

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