EP0225937A1 - Rotary piston pump for conveying manure or the like - Google Patents

Rotary piston pump for conveying manure or the like Download PDF

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Publication number
EP0225937A1
EP0225937A1 EP85116283A EP85116283A EP0225937A1 EP 0225937 A1 EP0225937 A1 EP 0225937A1 EP 85116283 A EP85116283 A EP 85116283A EP 85116283 A EP85116283 A EP 85116283A EP 0225937 A1 EP0225937 A1 EP 0225937A1
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EP
European Patent Office
Prior art keywords
rotary
rotary lobe
lobe pump
housing
piston
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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.)
Granted
Application number
EP85116283A
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German (de)
French (fr)
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EP0225937B1 (en
Inventor
Gerhard Eckart
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Individual
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Individual
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Priority to DE19843427282 priority Critical patent/DE3427282A1/en
Application filed by Individual filed Critical Individual
Priority to DE8585116283T priority patent/DE3579463D1/en
Priority to AT85116283T priority patent/ATE56076T1/en
Priority to EP85116283A priority patent/EP0225937B1/en
Publication of EP0225937A1 publication Critical patent/EP0225937A1/en
Application granted granted Critical
Publication of EP0225937B1 publication Critical patent/EP0225937B1/en
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    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/126—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type

Definitions

  • the invention relates to a rotary lobe pump for conveying material interspersed with foreign bodies, such as liquid manure or the like, in which two rotary pistons which roll on one another and rotate in opposite directions are fastened in a housing on two mutually parallel shafts.
  • each rotary lobe has an elastically flexible outer jacket made of rubber.
  • the invention has for its object to develop the known slurry pump so that even after a long period of operation and wear on the outer surface of the rotary lobes, the resulting play between the piston and the housing can be compensated or the piston can be replaced quickly and easily.
  • the invention provides that the inner wall of the housing is radially movable with respect to the axis of the associated rotary piston.
  • This measure also makes it possible to make up for relatively heavy wear on the outer jacket of the rotary lobe, so that the pump performance is not impaired.
  • the radially movable inner wall consists of partially cylindrical shells.
  • Each of these shells can be radially adjustable by means of adjusting screws, but it is also possible to bring about radial adjustment by means of elastic elements or by means of a pressure medium.
  • means are provided for guiding it.
  • the rotary pistons of which consist of a carrier body and an elastic jacket surrounding its circumference, provision is made for adjusting pistons which can be acted upon by pressure medium to be arranged between the carrier body and the jacket.
  • the adjusting pistons are preferably connected via feed channels to a supply bore machined into the associated shaft.
  • each rotary lobe can be attached to the shaft in a torsionally elastic manner.
  • the rotary pistons can be quickly removed and replaced if necessary, they are divided according to a further feature of the invention in at least one axial plane, the piston parts formed thereby being releasably connected to one another.
  • the rotary piston has sliding, axially extending sealing strips on the inner wall of the housing.
  • At least one coaxial annular groove is machined into the end faces of each rotary piston, into which an annular sealing projection attached to the housing engages like a labyrinth.
  • This measure helps to ensure that no pumped medium can escape from the pump, even at very high pressures.
  • a wear plate can also be fastened between the end faces of the rotary pistons and the opposite inner wall of the housing to avoid leakage losses. It has been found that the frequently occurring high pressures in the pump act so strongly on the cover closing the housing that they are deformed or damaged. This disadvantage can be prevented by the wear plate.
  • the rotary lobe pump has a housing 10 which is approximately oval in cross section and in which two mutually parallel shafts 12 are rotatably mounted.
  • An approximately lemniscate-shaped rotary piston 14 is attached to each shaft 12.
  • the two rotary pistons 14 roll on each other like a Roots blower and rotate in opposite directions.
  • each rotary piston 14 consists of a fixed support body 16 and a circumferential, elastic jacket 18, which consists for example of rubber.
  • the inner wall of the housing 10, on which the rotary pistons 14 roll consists of two semi-cylindrical shells 20 made of a wear-resistant material.
  • each shell 20 is radially movable with respect to the axis of the associated rotary piston 14 (arrow A in FIG. 1). So that each shell 20 is guided in its radial displacement in such a way that it cannot deflect either in the circumferential direction or in the axial direction, it engages with a radial, pin-shaped projection 22 in a corresponding radial bore 24 which is machined into the housing 10.
  • FIG. 1 In order to enable the radial adjustment movement of the shells 20, there are several possibilities, two of which are indicated in FIG. 1. As the upper half of FIG. 1 shows, a threaded hole can be machined into the peg-shaped extension 22, into which a set screw 26 engages, the head of which is supported on the housing 10. Instead of the attachment 22 for guiding the radial movement, other measures can be provided, for example pins, guiding attachments at the ends of the shells 20 or the like.
  • the radial bore 24 of the housing 10 is closed by a screw 28. Between this and the free end of the neck 22, a compression spring 30 is used, which serves to automatically catch up when the piston skirt 18 wears.
  • Another possibility, not shown, for wear compensation consists in passing a pressure medium, for example oil, into the radial bore 24.
  • FIG. 1 also shows that the radial displaceability of the two shells 20 after covering a distance s is limited by a stop 36 both in the area of the suction port 32 and the pressure port 34.
  • FIG. 2 shows a front end of the pump, which is opposite the drive end. It can be seen here that a cover 38 is flanged to the housing 10 and accommodates the bearings 40 for the two shafts 12. Between the cover 38 and the housing 10, a wear plate 42 is clamped, which consists for example of hardened steel. In this way, high pressures in the pump chamber 44 are absorbed by the wear plate 42, so that the inner wall of the housing 10 formed by the cover 38 is relieved and is protected from deformation.
  • seal packings 46 are provided to seal the pump chamber 44 from the outside.
  • annular sealing projection 48 coaxial with the shaft 12 is formed, which engages in an associated annular groove 50 which is worked into the jacket 18 of the rotary piston 14. This labyrinth seal prevents possible leakage losses.
  • the rotary piston 14 is divided in the axial plane 52, so that two piston parts 14 'and 14' 'are formed, which are releasably connected by bolts 54.
  • the latter In the area of the parting joint of the rotary piston 14, the latter carries two sealing strips 56, which bear against the semi-cylindrical shell 20 forming the inner wall of the housing 10.
  • the rotary piston 14 is rotatably mounted on the shaft 12.
  • the shaft 12 is rectangular in cross-section and passes through a likewise rectangular receiving bore 58 of the rotary piston 14.
  • elastic blocks 60 are used between the shaft 12 and the rectangular receiving bore 58 of the rotary piston 14, so that the latter yields elastically in the circumferential direction when For example, large or hard foreign bodies are conveyed through the pump chamber 44.
  • damping members for example spring bands or torsion springs, can of course also be used.
  • Figures 4 and 5 show that other piston shapes can be divided in axial planes and are elastically connected to the associated shaft 12.
  • FIG. 6 A further example of how play between the rotary piston 14 and the inner wall of the housing - here the semi-cylindrical shell 20 - can be compensated for is shown in FIG. 6.
  • adjusting pistons 62 are fastened to the inner wall of the elastic jacket surrounding the support body 16, for example by vulcanization which can be acted upon by a pressure medium, for example oil, air, grease or the like.
  • the pressure medium is guided to the adjusting pistons 62 via radial feed channels 64.
  • a sensor (not shown) can be provided, which controls a pump for the pressure medium as soon as a predetermined, permissible clearance between the piston and the inner wall of the housing is exceeded.
  • FIG. 7 shows an application example of the invention in which two rotary lobe pumps I and II are connected axially in series.
  • the pressure port 34 of the pump I is connected to the suction port 32 of the pump II.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

1. Rotary piston pump for conveying material interspersed with foreign bodies, such as liquid manure or the like, in which two rotary pistons rolling on one another and rotating in opposition are secured in a housing on two mutually parallel shafts, the rotary pistons comprising respectively a carrier body and a resilient jacket surrounding the periphery thereof, characterized in that adjustment pistons (62) which can be acted upon by pressure medium are arranged between the carrier body (16) and the jacket (18).

Description

Die Erfindung betrifft eine Drehkolbenpumpe zur Förderung von mit Fremdkörpern durchsetztem Gut wie Gülle oder dgl., bei der in einem Gehäuse auf zwei zueinander parallelen Wellen zwei sich aufeinander abwälzende, gegenläufig umlaufende Drehkolben befestigt sind.The invention relates to a rotary lobe pump for conveying material interspersed with foreign bodies, such as liquid manure or the like, in which two rotary pistons which roll on one another and rotate in opposite directions are fastened in a housing on two mutually parallel shafts.

Eine derartige Pumpe ist in der DE-PS 20 02 518 beschrieben und dargestellt. Um auch Gülle fördern zu können, die in erhebli­chem Maß mit Fremdkörpern sowie mit langfaserigen Bestandteilen wie Heu und Stroh durchsetzt ist und eine nur schwer pumpbare Konsistenz hat, ist vorgesehen, daß jeder Drehkolben einen ela­stisch nachgiebigen Außenmantel aus Gummi hat.Such a pump is described and shown in DE-PS 20 02 518. In order to also be able to promote liquid manure, which is to a large extent interspersed with foreign bodies and with long-fiber components such as hay and straw and has a consistency that is difficult to pump, it is provided that each rotary lobe has an elastically flexible outer jacket made of rubber.

Der Erfindung liegt die Aufgabe zugrunde, die bekannte Gülle­pumpe so weiterzuentwickeln, daß auch nach längerer Betriebsdau­er und einem Verschleiß am Außenmantel der Drehkolben ein da­durch entstandenes Spiel zwischen Kolben und Gehäuse ausgegli­chen bzw. der Kolben rasch und einfach ausgewechselt werden kann.The invention has for its object to develop the known slurry pump so that even after a long period of operation and wear on the outer surface of the rotary lobes, the resulting play between the piston and the housing can be compensated or the piston can be replaced quickly and easily.

Zur Lösung der Aufgabe ist erfindungsgemäß vorgesehen, daß die Innenwand des Gehäuses bezüglich der Achse des zugehörigen Dreh­kolbens radial beweglich ist.To achieve the object, the invention provides that the inner wall of the housing is radially movable with respect to the axis of the associated rotary piston.

Mit dieser Maßnahme kann auch ein verhältnismäßig starker Ver­schleiß am Außenmantel des Drehkolbens aufgeholt werden, so daß die Pumpleistung nicht beeinträchtigt wird.This measure also makes it possible to make up for relatively heavy wear on the outer jacket of the rotary lobe, so that the pump performance is not impaired.

Dabei ist es vorteilhaft, wenn die radial bewegliche Innenwand aus teilzylindrischen Schalen besteht.It is advantageous if the radially movable inner wall consists of partially cylindrical shells.

Jede dieser Schalen kann mittels Stellschrauben radial einstell­bar sein, es ist jedoch auch möglich, eine radiale Verstellung durch elastische Elemente oder durch ein Druckmedium herbeizu­führen.Each of these shells can be radially adjustable by means of adjusting screws, but it is also possible to bring about radial adjustment by means of elastic elements or by means of a pressure medium.

Um bei der radialen Verstellbewegung die Schale jederzeit so führen zu können, daß sie weder in Umfangsrichtung noch in Axialrichtung wandert, sind Mittel zu ihrer Führung vorgesehen.In order to be able to guide the shell at any time during the radial adjustment movement so that it does not move in the circumferential direction or in the axial direction, means are provided for guiding it.

Bei einer anderen Lösung der angegebenen Aufgabe ist bei der gattungsgemäßen Kolbenpumpe, deren Drehkolben aus je einem Trä­gerkörper und einem dessen Umfang umgebenden, elastischen Man­tel bestehen, vorgesehen, daß zwischen dem Tragkörper und dem Mantel durch Druckmedium beaufschlagbare Verstellkolben angeord­net sind.In another solution to the stated object, in the generic piston pump, the rotary pistons of which consist of a carrier body and an elastic jacket surrounding its circumference, provision is made for adjusting pistons which can be acted upon by pressure medium to be arranged between the carrier body and the jacket.

Vorzugsweise sind dabei die Verstellkolben über Zuführkanäle mit einer in die zugehörige Welle eingearbeiteten Versorgungs­bohrung verbunden.The adjusting pistons are preferably connected via feed channels to a supply bore machined into the associated shaft.

Bei dieser Lösung wird ein durch Verschleiß oder dgl. entstande­nes Spiel zwischen Kolben und Gehäuseinnenwand dadurch aufge­holt, daß der Kolben durch das Druckmedium, beispielsweise Fett, Öl oder Luft, radial aufgeweitet wird.In this solution, a play between the piston and the inner wall of the housing caused by wear or the like is compensated for in that the piston is radially expanded by the pressure medium, for example grease, oil or air.

Um zu verhindern, daß besonders große, feste Fremdkörper in dem Fördermedium durch Festklemmen die Pumpe stillsetzen, kann je­der Drehkolben drehelastisch auf der Welle befestigt sein.In order to prevent particularly large, solid foreign bodies in the pumping medium from stopping the pump by clamping, each rotary lobe can be attached to the shaft in a torsionally elastic manner.

Damit die Drehkolben im Bedarfsfall rasch ausgebaut und ausge­wechselt werden können, sind diese nach einem weiteren Merkmal der Erfindung in wenigstens einer Axialebene geteilt, wobei die dadurch gebildeten Kolbenteile lösbar miteinander verbunden sind.So that the rotary pistons can be quickly removed and replaced if necessary, they are divided according to a further feature of the invention in at least one axial plane, the piston parts formed thereby being releasably connected to one another.

Zur weiteren Verbesserung der Pumpleistung und zur Verringerung des Spiels zwischen Drehkolben und Gehäuseinnenwand kann vorge­sehen sein, daß der Drehkolben an der Innenwand des Gehäuses gleitende, axial verlaufende Dichtleisten aufweist.To further improve the pump performance and to reduce the play between the rotary piston and the inner wall of the housing, it can be provided that the rotary piston has sliding, axially extending sealing strips on the inner wall of the housing.

Nach einem anderen Merkmal der Erfindung ist in die Stirnseiten jedes Drehkolbens wenigstens eine koaxiale Ringnut eingearbei­tet, in die ein ringförmiger, am Gehäuse befestigter Dichtvor­sprung labyrinthartig eingreift.According to another feature of the invention, at least one coaxial annular groove is machined into the end faces of each rotary piston, into which an annular sealing projection attached to the housing engages like a labyrinth.

Diese Maßnahme trägt dazu bei, daß auch bei sehr hohen Drücken kein Fördermedium aus der Pumpe austreten kann.This measure helps to ensure that no pumped medium can escape from the pump, even at very high pressures.

Ebenfalls zur Vermeidung von Leckverlusten kann außerdem zwi­schen den Stirnseiten der Drehkolben und der gegenüberliegenden Innenwand des Gehäuses eine Verschleißplatte befestigt sein. Es hat sich nämlich herausgestellt, daß die häufig vorkommenden, hohen Drücke in der Pumpe so stark auf die das Gehäuse abschlie­ßenden Deckel einwirken, daß diese dabei verformt oder beschä­digt werden. Dieser Nachteil kann durch die Verschleißplatte verhindert werden.A wear plate can also be fastened between the end faces of the rotary pistons and the opposite inner wall of the housing to avoid leakage losses. It has been found that the frequently occurring high pressures in the pump act so strongly on the cover closing the housing that they are deformed or damaged. This disadvantage can be prevented by the wear plate.

Um eine Druckerhöhung mit der erfindungsgemäß ausgebildeten Drehkolbenpumpe herbeizuführen, ist es zweckmäßig, axial hinter die Drehkolbenpumpe eine zweite, entsprechend ausgebildete Dreh­kolbenpumpe zu schalten, deren Saugstutzen zum Druckstutzen der ersten Drehkolbenpumpe führt.In order to bring about a pressure increase with the rotary lobe pump designed according to the invention, it is expedient to connect a second, appropriately designed rotary lobe pump axially behind the rotary lobe pump, the suction port of which leads to the pressure port of the first rotary lobe pump.

Die Erfindung ist nachstehend an Ausführungsbeispielen erläu­tert, die in der Zeichnung dargestellt sind.The invention is explained below using exemplary embodiments which are illustrated in the drawing.

Es zeigen:

  • Figur 1 einen Querschnitt einer Drehkolbenpumpe gemäß der Er­findung, die zwei Varianten für die radiale Verstell­barkeit der Gehäuseinnenwand zeigt,
  • Figur 2 einen teilweisen Axialschnitt in der Ebene II - II der Figur 1,
  • Figur 3 den Querschnitt einer anderen Ausführungsform des Dreh­kolbens,
  • Figur 4 den Querschnitt eines weiteren Drehkolbens,
  • Figur 5 eine andere Form eines Drehkolbens im Querschnitt.
  • Figur 6 einen Drehkolben im Querschnitt mit Verstellkolben und
  • Figur 7 eine Reihenschaltung der Drehkolbenpumpe gemäß der Er­findung.
Show it:
  • FIG. 1 shows a cross section of a rotary lobe pump according to the invention, which shows two variants for the radial adjustability of the housing inner wall,
  • FIG. 2 shows a partial axial section in the plane II-II of FIG. 1,
  • FIG. 3 shows the cross section of another embodiment of the rotary piston,
  • FIG. 4 shows the cross section of a further rotary piston,
  • Figure 5 shows another shape of a rotary piston in cross section.
  • Figure 6 shows a rotary piston in cross section with adjusting piston and
  • Figure 7 shows a series connection of the rotary lobe pump according to the invention.

Wie die Figuren 1 und 2 zeigen, hat die Drehkolbenpumpe ein im Querschnitt etwa ovales Gehäuse 10, in dem zwei zueinander par­allele Wellen 12 drehbar gelagert sind. Auf jeder Welle 12 ist ein etwa lemniskatenförmiger Drehkolben 14 befestigt. Die bei­den Drehkolben 14 wälzen sich nach Art eines Roots-Gebläses auf­einander ab und drehen sich dabei gegenläufig.As FIGS. 1 and 2 show, the rotary lobe pump has a housing 10 which is approximately oval in cross section and in which two mutually parallel shafts 12 are rotatably mounted. An approximately lemniscate-shaped rotary piston 14 is attached to each shaft 12. The two rotary pistons 14 roll on each other like a Roots blower and rotate in opposite directions.

Beim Ausführungsbeispiel der Figuren 1 und 2 besteht jeder Dreh­kolben 14 aus einem festen Trägerkörper 16 und einem dessen Um­fang umgebenden, elastischen Mantel 18, der beispielsweise aus Gummi besteht.In the embodiment of Figures 1 and 2, each rotary piston 14 consists of a fixed support body 16 and a circumferential, elastic jacket 18, which consists for example of rubber.

Die Innenwand des Gehäuses 10, an der sich die Drehkolben 14 ab­wälzen, besteht gemäß Figur 1 aus zwei halbzylindrischen Scha­len 20 aus einem verschleißfesten Werkstoff. Gemäß der Erfin­dung ist jede Schale 20 bezüglich der Achse des zugehörigen Drehkolbens 14 radial beweglich (Pfeil A in Figur 1). Damit jede Schale 20 bei ihrer Radialverschiebung so geführt wird, daß sie weder in Umfangsrichtung noch in Axialrichtung auswei­chen kann, greift sie mit einem radialen, zapfenförmigen Ansatz 22 in eine entsprechende Radialbohrung 24 ein, die in das Gehäu­se 10 eingearbeitet ist. Damit auch bei sehr langen Drehkolben 14 ein Verkanten der Schalen 20 vermieden wird, ist es zweck­mäßig, über die axiale Länge (Figur 2) der Schalen 20 mehrere dieser Führungsansätze 22 vorzusehen.According to FIG. 1, the inner wall of the housing 10, on which the rotary pistons 14 roll, consists of two semi-cylindrical shells 20 made of a wear-resistant material. According to the invention, each shell 20 is radially movable with respect to the axis of the associated rotary piston 14 (arrow A in FIG. 1). So that each shell 20 is guided in its radial displacement in such a way that it cannot deflect either in the circumferential direction or in the axial direction, it engages with a radial, pin-shaped projection 22 in a corresponding radial bore 24 which is machined into the housing 10. In order to avoid tilting of the shells 20 even with very long rotary pistons 14, it is expedient to provide several of these guide projections 22 over the axial length (FIG. 2) of the shells 20.

Um die radiale Verstellbewegung der Schalen 20 zu ermöglichen, gibt es mehrere Möglichkeiten, von denen in Figur 1 zwei ange­deutet sind. Wie die obere Hälfte der Figur 1 zeigt, kann in den zapfenförmigen Ansatz 22 eine Gewindebohrung eingearbeitet sein, in die eine Stellschraube 26 eingreift, deren Kopf sich am Gehäuse 10 abstützt. Statt des Ansatzes 22 für die Führung bei der Radialbewegung können andere Maßnahmen vorgesehen wer­den, beispielsweise Stifte, Führungsansätze an den Enden der Schalen 20 o. dgl.In order to enable the radial adjustment movement of the shells 20, there are several possibilities, two of which are indicated in FIG. 1. As the upper half of FIG. 1 shows, a threaded hole can be machined into the peg-shaped extension 22, into which a set screw 26 engages, the head of which is supported on the housing 10. Instead of the attachment 22 for guiding the radial movement, other measures can be provided, for example pins, guiding attachments at the ends of the shells 20 or the like.

Bei der in der unteren Hälfte der Figur 1 gezeigten Variante ist die Radialbohrung 24 des Gehäuses 10 durch eine Schraube 28 abgeschlossen. Zwischen diese und dem freien Ende des Ansatzes 22 ist eine Druckfeder 30 eingesetzt, die bei Verschleiß des Kolbenmantels 18 zur automatischen Spielaufholung dient.In the variant shown in the lower half of FIG. 1, the radial bore 24 of the housing 10 is closed by a screw 28. Between this and the free end of the neck 22, a compression spring 30 is used, which serves to automatically catch up when the piston skirt 18 wears.

Eine weitere, nicht dargestellte Möglichkeit zur Verschleiß­kompensation besteht darin, in die Radialbohrung 24 ein Druckme­dium, beispielsweise Öl, zu leiten.Another possibility, not shown, for wear compensation consists in passing a pressure medium, for example oil, into the radial bore 24.

Figur 1 zeigt ferner, daß die radiale Verschiebbarkeit der bei­den Schalen 20 nach Zurücklegung einer Strecke s sowohl im Be­reich des Saugstutzens 32 als auch des Druckstutzens 34 durch einen Anschlag 36 begrenzt ist.FIG. 1 also shows that the radial displaceability of the two shells 20 after covering a distance s is limited by a stop 36 both in the area of the suction port 32 and the pressure port 34.

Figur 2 zeigt ein Stirnende der Pumpe, das dem Antriebsende ge­genüberliegt. Hier ist zu erkennen, daß am Gehäuse 10 ein Deckel 38 angeflanscht ist, der die Lager 40 für die beiden Wel­len 12 aufnimmt. Zwischen Deckel 38 und Gehäuse 10 ist eine Ver­schleißplatte 42 eingespannt, die beispielsweise aus gehärtetem Stahl besteht. Auf diese Weise werden hohe Drücke im Pumpraum 44 von der Verschleißplatte 42 aufgenommen, so daß die durch den Deckel 38 gebildete Innenwand des Gehäuses 10 entlastet ist und vor Verformungen geschützt wird.Figure 2 shows a front end of the pump, which is opposite the drive end. It can be seen here that a cover 38 is flanged to the housing 10 and accommodates the bearings 40 for the two shafts 12. Between the cover 38 and the housing 10, a wear plate 42 is clamped, which consists for example of hardened steel. In this way, high pressures in the pump chamber 44 are absorbed by the wear plate 42, so that the inner wall of the housing 10 formed by the cover 38 is relieved and is protected from deformation.

Zur Abdichtung des Pumpraumes 44 nach außen sind bekannte Dich­tungspackungen 46 vergesehen. Zusätzlich dazu ist an der jedem Drehkolben 14 gegenüberliegenden Stirnseite des Gehäusedeckels 38 ein zur Welle 12 koaxialer, ringförmiger Dichtvorsprung 48 ausgebildet, der in eine zugehörige Ringnut 50 eingreift, die in den Mantel 18 des Drehkolbens 14 eingearbeitet ist. Durch diese Labyrinthdichtung werden mögliche Leckverluste verhin­dert.Known seal packings 46 are provided to seal the pump chamber 44 from the outside. In addition to this, on the end face of the housing cover 38 opposite each rotary piston 14, an annular sealing projection 48 coaxial with the shaft 12 is formed, which engages in an associated annular groove 50 which is worked into the jacket 18 of the rotary piston 14. This labyrinth seal prevents possible leakage losses.

Falls der Drehkolben 14 - wie in den Figuren 3 bis 5 - keinen elastischen Mantel 18 aufweist, ist die Ringnut 50 selbstver­ständlich in den Trägerkörper 16 eingearbeitet.If the rotary piston 14 - as in FIGS. 3 to 5 - does not have an elastic jacket 18, the annular groove 50 is of course incorporated into the carrier body 16.

Beim Ausführungsbeispiel der Figur 3 ist der Drehkolben 14 in der Axialebene 52 geteilt, so daß zwei Kolbenteile 14′ und 14′′ gebildet werden, die durch Schraubbolzen 54 lösbar miteinander verbunden sind.In the embodiment of Figure 3, the rotary piston 14 is divided in the axial plane 52, so that two piston parts 14 'and 14' 'are formed, which are releasably connected by bolts 54.

Im Bereich der Teilfuge des Drehkolbens 14 trägt dieser zwei Dichtleisten 56, die an der die Innenwand des Gehäuses 10 bil­denden, halbzylindrischen Schale 20 dichtend anliegen.In the area of the parting joint of the rotary piston 14, the latter carries two sealing strips 56, which bear against the semi-cylindrical shell 20 forming the inner wall of the housing 10.

Beim Ausführungsbeispiel der Figur 3 ist ferner der Drehkolben 14 drehelastisch auf der Welle 12 befestigt. Hierzu ist die Wel­le 12 im Querschnitt rechteckig ausgebildet und durchläuft eine ebenfalls rechteckige Aufnahmebohrung 58 des Drehkolbens 14. Zur Übertragung des Drehmomentes dienen elastische Klötze 60 zwischen der Welle 12 und der rechteckigen Aufnahmebohrung 58 des Drehkolben 14, so daß dieser in Umfangsrichtung elastisch nachgibt, wenn beispielsweise große oder harte Fremdkörper durch den Pumpraum 44 gefördert werden.In the embodiment of Figure 3, the rotary piston 14 is rotatably mounted on the shaft 12. For this purpose, the shaft 12 is rectangular in cross-section and passes through a likewise rectangular receiving bore 58 of the rotary piston 14. For the transmission of the torque, elastic blocks 60 are used between the shaft 12 and the rectangular receiving bore 58 of the rotary piston 14, so that the latter yields elastically in the circumferential direction when For example, large or hard foreign bodies are conveyed through the pump chamber 44.

Anstelle der Klötze 60 können selbstverständlich auch andere Dämpfungsglieder, beispielsweise Federbänder oder Drehfedern verwendet werden.Instead of the blocks 60, other damping members, for example spring bands or torsion springs, can of course also be used.

Die Figuren 4 und 5 zeigen, daß auch andere Kolbenformen in axialen Ebenen geteilt werden können und mit der zugehörigen Welle 12 elastisch verbunden sind.Figures 4 and 5 show that other piston shapes can be divided in axial planes and are elastically connected to the associated shaft 12.

Ein weiteres Beispiel, wie Spiel zwischen dem Drehkolben 14 und der Innenwand des Gehäuses - hier der halbzylindrischen Schale 20 - kompensiert werden kann, zeigt Figur 6. Hier sind an der Innenwand des den Trägerkörper 16 umgebenden, elastischen Man­tels 18 Verstellkolben 62 beispielsweise durch Vulkanisierung befestigt, die mit einem Druckmedium beaufschlagt werden kön­nen, beispielsweise mit Öl, Luft, Fett oder dgl. Das Druckme­dium wird über radiale Zuführkanäle 64 zu den Verstellkolben 62 geleitet. Die Zuführkanäle 64, in die die Verstellkolben 62 ein­ greifen, gehen von einer zentralen Versorgungsbohrung 66 aus, die axial in die den Drehkolben 14 tragende Welle 12 eingearbei­tet ist.A further example of how play between the rotary piston 14 and the inner wall of the housing - here the semi-cylindrical shell 20 - can be compensated for is shown in FIG. 6. Here, adjusting pistons 62 are fastened to the inner wall of the elastic jacket surrounding the support body 16, for example by vulcanization which can be acted upon by a pressure medium, for example oil, air, grease or the like. The pressure medium is guided to the adjusting pistons 62 via radial feed channels 64. The feed channels 64 into which the adjusting pistons 62 enter engage, start from a central supply bore 66 which is axially machined into the shaft 12 carrying the rotary piston 14.

Zur Steuerung der Druckbeaufschlagung kann ein nicht dargestell­ter Sensor vorgesehen sein, der eine Pumpe für das Druckmedium ansteuert, sobald ein vorbestimmtes, zulässiges Spiel zwischen Kolben und Gehäuseinnenwand überschritten wird.To control the pressurization, a sensor (not shown) can be provided, which controls a pump for the pressure medium as soon as a predetermined, permissible clearance between the piston and the inner wall of the housing is exceeded.

Figur 7 zeigt ein Anwendungsbeispiel der Erfindung, bei dem zwei Drehkolbenpumpen I und II axial hintereinandergeschaltet sind. Zur Erhöhung des Förderdruckes ist dabei der Druckstutzen 34 der Pumpe I mit dem Saugstutzen 32 der Pumpe II verbunden.FIG. 7 shows an application example of the invention in which two rotary lobe pumps I and II are connected axially in series. To increase the delivery pressure, the pressure port 34 of the pump I is connected to the suction port 32 of the pump II.

Claims (15)

1. Drehkolbenpumpe zur Förderung von mit Fremdkörpern durchsetz­tem Gut wie Gülle oder dgl., bei der in einem Gehäuse auf zwei zueinander parallelen Wellen zwei sich aufeinander abwälzende, gegenläufig umlaufende Drehkolben befestigt sind, dadurch ge­kennzeichnet, daß die Innenwand des Gehäuses (10) be­züglich der Achse des zugehörigen Drehkolbens (14) radial beweg­lich ist.1. Rotary lobe pump for conveying material interspersed with foreign matter such as liquid manure or the like, in which two mutually rolling, counter-rotating rotary lobes are fastened in a housing on two mutually parallel shafts, characterized in that the inner wall of the housing (10) with respect to the Axis of the associated rotary piston (14) is radially movable. 2. Drehkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Innenwand aus teilzylindrischen Schalen (20) besteht.2. Rotary lobe pump according to claim 1, characterized in that the inner wall consists of partially cylindrical shells (20). 3. Drehkolbenpumpe nach Anspruch 2, dadurch gekennzeichnet, daß jede Schale (20) mittels Stellschrauben (26) radial einstellbar ist.3. Rotary lobe pump according to claim 2, characterized in that each shell (20) by means of adjusting screws (26) is radially adjustable. 4. Drehkolbenpumpe nach Anspruch 2, dadurch gekennzeichnet, daß jede Schale (20) mittels elastischer Elemente (30) radial ver­stellbar ist.4. Rotary lobe pump according to claim 2, characterized in that each shell (20) is radially adjustable by means of elastic elements (30). 5. Drehkolbenpumpe nach Anspruch 2, dadurch gekennzeichnet, daß jede Schale (20) durch ein Druckmedium radial einstellbar ist.5. Rotary lobe pump according to claim 2, characterized in that each shell (20) is radially adjustable by a pressure medium. 6. Drehkolbenpumpe nach einem der Ansprüche 2 bis 5, dadurch ge­kennzeichnet, daß jede Schale (20) Mittel (22) zu ihrer Führung bei der Radialbewegung aufweist.6. Rotary lobe pump according to one of claims 2 to 5, characterized in that each shell (20) has means (22) for guiding it during the radial movement. 7. Drehkolbenpumpe zur Förderung von mit Fremdkörpern durchsetz­tem Gut wie Gülle oder dgl., bei der in einem Gehäuse auf zwei zueinander prallelen Wellen zwei sich aufeinander abwälzende, gegenläufig umlaufende Drehkolben befestigt sind, die aus je ei­nem Trägerkörper und einem dessen Umfang umgebenden, elasti­schen Mantel bestehen, dadurch gekennzeichnet, daß zwischen dem Trägerkörper (16) und dem Mantel (18) durch Druckmedium beauf­ schlagbare Verstellkolben (62) angeordnet sind.7. Rotary lobe pump for conveying material interspersed with foreign bodies such as liquid manure or the like, in which two rotating, oppositely rotating rotary lobes are fastened in a housing on two mutually parallel shafts, each consisting of a carrier body and an elastic jacket surrounding its circumference exist, characterized in that bet between the carrier body (16) and the jacket (18) by pressure medium beatable adjusting piston (62) are arranged. 8. Drehkolbenpumpe nach Anspruch 7, dadurch gekennzeichnet, daß die Verstellkolben (62) über Zuführkanäle (64) mit einer in die zugehörige Welle (12) eingearbeiteten Versorgungsbohrung (66) verbunden sind.8. Rotary lobe pump according to claim 7, characterized in that the adjusting pistons (62) are connected via feed channels (64) to a supply bore (66) incorporated in the associated shaft (12). 9. Drehkolbenpumpe, insbesondere nach Anspruch 1 oder 7, da­durch gekennzeichnet, daß jeder Drehkolben (14) drehelastisch auf der Welle (12) befestigt ist.9. rotary lobe pump, in particular according to claim 1 or 7, characterized in that each rotary lobe (14) is rotatably mounted on the shaft (12). 10. Drehkolbenpumpe nach Anspruch 9, dadurch gekennzeichnet, daß zwischen der prismatisch ausgebildeten Welle (12) und der ebenfalls prismatischen Aufnahmebohrung (58) des Drehkolbens (14) Federelemente (60) befestigt sind.10. Rotary lobe pump according to claim 9, characterized in that spring elements (60) are fastened between the prismatic shaft (12) and the likewise prismatic receiving bore (58) of the rotary lobe (14). 11. Drehkolbenpumpe, insbesondere nach Anspruch 9, dadurch ge­kennzeichnet, daß der Drehkolben (14) in wenigstens einer Axial­ebene (52) geteilt ist und die Kolbenteile lösbar miteinander verbunden sind.11. Rotary piston pump, in particular according to claim 9, characterized in that the rotary piston (14) is divided in at least one axial plane (52) and the piston parts are detachably connected to one another. 12. Drehkolbenpumpe, insbesondere nach Anspruch 1 oder 11, da­durch gekennzeichnet, daß der Drehkolben (14) an der Innenwand des Gehäuses (10) gleitende, axial verlaufende Dichtleisten (56) aufweist.12. Rotary lobe pump, in particular according to claim 1 or 11, characterized in that the rotary lobe (14) on the inner wall of the housing (10) has sliding, axially extending sealing strips (56). 13. Drehkolbenpumpe, insbesondere nach Anspruch 1, dadurch ge­kennzeichnet, daß in die Stirnseiten jedes Drehkolbens (14) we­nigstens eine koaxiale Ringnut (50) eingearbeitet ist, in die ein ringförmiger, am Gehäuse (10) befestigter Dichtvorsprung (48) labyrinthartig eingreift.13. Rotary lobe pump, in particular according to claim 1, characterized in that in the end faces of each rotary lobe (14) at least one coaxial annular groove (50) is incorporated into which an annular, on the housing (10) attached sealing projection (48) engages like a labyrinth. 14. Drehkolbenpumpe, insbesondere nach Anspruch 13, dadurch ge­kennzeichnet, daß zwischen den Stirnseiten der Drehkolben (14) und der gegenüberliegenden Innenwand des Gehäuses (10) eine Ver­schleißplatte (42) befestigt ist.14. Rotary lobe pump, in particular according to claim 13, characterized in that a wear plate (42) is fastened between the end faces of the rotary lobes (14) and the opposite inner wall of the housing (10). 15. Drehkolbenpumpe, insbesondere nach Anspruch 1, dadurch ge­kennzeichnet, daß axial hinter die Drehkolbenpumpe eine zweite, entsprechend ausgebildete Drehkolbenpumpe geschaltet ist, deren Saugstutzen (32) zum Druckstutzen (34) der ersten Drehkolben­pumpe führt.15. Rotary lobe pump, in particular according to claim 1, characterized in that a second, appropriately designed rotary lobe pump is connected axially behind the rotary lobe pump, the suction port (32) leading to the pressure port (34) of the first rotary lobe pump.
EP85116283A 1984-07-24 1985-12-19 Rotary piston pump for conveying manure or the like Expired - Lifetime EP0225937B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19843427282 DE3427282A1 (en) 1984-07-24 1984-07-24 Rotary piston pump for pumping liquid manure or the like
DE8585116283T DE3579463D1 (en) 1985-12-19 1985-12-19 TURNING PISTON PUMP FOR PROCESSING GUELLE OR THE LIKE
AT85116283T ATE56076T1 (en) 1985-12-19 1985-12-19 ROTARY PUMP FOR PUMPING GUELLE OR LIKE.
EP85116283A EP0225937B1 (en) 1985-12-19 1985-12-19 Rotary piston pump for conveying manure or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85116283A EP0225937B1 (en) 1985-12-19 1985-12-19 Rotary piston pump for conveying manure or the like

Publications (2)

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EP0225937A1 true EP0225937A1 (en) 1987-06-24
EP0225937B1 EP0225937B1 (en) 1990-08-29

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EP85116283A Expired - Lifetime EP0225937B1 (en) 1984-07-24 1985-12-19 Rotary piston pump for conveying manure or the like

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EP (1) EP0225937B1 (en)
AT (1) ATE56076T1 (en)
DE (1) DE3579463D1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0389838A2 (en) * 1989-03-30 1990-10-03 Inoxpa, S.A. Housing for rotary pump
US5312231A (en) * 1992-07-24 1994-05-17 Engineering Corporation Slurry conveyor device
US6095781A (en) * 1997-09-11 2000-08-01 Viking Pump, Inc. Timed element, high pressure, industrial rotary lobe pump
GB2429751A (en) * 2005-08-31 2007-03-07 Alfa Laval Corp Ab Axially removable flanged wearplate for lobe pump
DE102010014248A1 (en) * 2010-04-08 2011-10-13 Netzsch-Mohnopumpen Gmbh Contact elements for rotary lobe pumps
DE202010015439U1 (en) * 2010-11-16 2012-02-17 Hugo Vogelsang Maschinenbau Gmbh Rotary pump and housing half shell for selbige
DE102012003287A1 (en) * 2012-02-20 2013-08-22 Netzsch Pumpen & Systeme Gmbh rotary pistons

Citations (6)

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Publication number Priority date Publication date Assignee Title
GB108394A (en) * 1916-09-28 1917-08-09 George Henry Boot Improvements relating to Rotary Pumps.
DE547725C (en) * 1930-12-10 1932-04-04 Hinrich Schottler Sealing of the piston drum against the housing wall of rotary piston machines with sickle-shaped work space
GB781240A (en) * 1955-12-22 1957-08-14 Georges Ilune Improvements in or relating to volumetric rotary pumps and/or compressors
USRE25567E (en) * 1964-05-05 Lorenz
US4137024A (en) * 1977-07-18 1979-01-30 Curtiss-Wright Corporation Rotor for rotary piston mechanism
DE3427282A1 (en) * 1984-07-24 1986-01-30 Gerhard 8300 Landshut Eckart Rotary piston pump for pumping liquid manure or the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE25567E (en) * 1964-05-05 Lorenz
GB108394A (en) * 1916-09-28 1917-08-09 George Henry Boot Improvements relating to Rotary Pumps.
DE547725C (en) * 1930-12-10 1932-04-04 Hinrich Schottler Sealing of the piston drum against the housing wall of rotary piston machines with sickle-shaped work space
GB781240A (en) * 1955-12-22 1957-08-14 Georges Ilune Improvements in or relating to volumetric rotary pumps and/or compressors
US4137024A (en) * 1977-07-18 1979-01-30 Curtiss-Wright Corporation Rotor for rotary piston mechanism
DE3427282A1 (en) * 1984-07-24 1986-01-30 Gerhard 8300 Landshut Eckart Rotary piston pump for pumping liquid manure or the like

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0389838A3 (en) * 1989-03-30 1991-01-09 Inoxpa, S.A. Housing for rotary pump
EP0389838A2 (en) * 1989-03-30 1990-10-03 Inoxpa, S.A. Housing for rotary pump
US5312231A (en) * 1992-07-24 1994-05-17 Engineering Corporation Slurry conveyor device
US6095781A (en) * 1997-09-11 2000-08-01 Viking Pump, Inc. Timed element, high pressure, industrial rotary lobe pump
GB2429751A (en) * 2005-08-31 2007-03-07 Alfa Laval Corp Ab Axially removable flanged wearplate for lobe pump
DE102010014248B4 (en) * 2010-04-08 2016-04-28 Netzsch Pumpen & Systeme Gmbh Contact elements for rotary lobe pumps
DE102010014248A1 (en) * 2010-04-08 2011-10-13 Netzsch-Mohnopumpen Gmbh Contact elements for rotary lobe pumps
WO2011124212A3 (en) * 2010-04-08 2013-03-21 Netzsch Mohnopumpen Gmbh Contact element for rotary piston pumps
DE202010015439U1 (en) * 2010-11-16 2012-02-17 Hugo Vogelsang Maschinenbau Gmbh Rotary pump and housing half shell for selbige
CN103299078A (en) * 2010-11-16 2013-09-11 福格申机械有限公司 Rotary piston pump and housing half-shell for same
CN103299078B (en) * 2010-11-16 2016-04-20 福格申机械有限公司 Rotary piston pump and half-shell thereof
WO2012066026A3 (en) * 2010-11-16 2013-06-20 Hugo Vogelsang Maschinenbau Gmbh Rotary piston pump and housing half-shell for same
US9702362B2 (en) 2010-11-16 2017-07-11 Hugo Vogelsang Maschinenbau Gmbh Rotary piston pump and casing half-shells for same
DE102012003287A1 (en) * 2012-02-20 2013-08-22 Netzsch Pumpen & Systeme Gmbh rotary pistons

Also Published As

Publication number Publication date
DE3579463D1 (en) 1990-10-04
EP0225937B1 (en) 1990-08-29
ATE56076T1 (en) 1990-09-15

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