EP0225937B1 - 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
EP0225937B1
EP0225937B1 EP85116283A EP85116283A EP0225937B1 EP 0225937 B1 EP0225937 B1 EP 0225937B1 EP 85116283 A EP85116283 A EP 85116283A EP 85116283 A EP85116283 A EP 85116283A EP 0225937 B1 EP0225937 B1 EP 0225937B1
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EP
European Patent Office
Prior art keywords
rotary piston
piston pump
pump according
rotary
housing
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EP85116283A
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German (de)
French (fr)
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EP0225937A1 (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
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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 rotating, oppositely rotating rotary lobes are fastened in a housing on two mutually parallel shafts, each consisting of a carrier body and a circumference surrounding its circumference. elastic jacket exist.
  • each rotary lobe has an elastically flexible outer jacket made of rubber.
  • a rotary lobe pump for the conveyance of very hot liquids in which cylindrical shells, which are acted upon by resilient plates, are arranged on the inside of the housing for perfect sealing even in the case of large thermal expansions in the high temperature range.
  • the subject of GB-A 108 394 is a gear pump for the delivery of lubricating oil or the like on machine tools, the inner walls of which can be adjusted radially in order to be able to make up for any play which has been caused by wear over a longer operating period.
  • US Pat. No. 4,137,024 discloses a rotary piston compressor in which the rotor consists of a carrier body and a casing, between which spring-loaded pressure plates are arranged.
  • the invention has for its object to further develop a slurry pump of the type outlined at the outset so that even after a long period of operation and wear on the outer jacket of the rotary lobes, any play between the piston and the housing which is caused thereby can be compensated for or the piston can be replaced quickly and easily.
  • adjusting pistons are arranged between the support body and the jacket of each rotary piston and can be acted upon by pressure medium.
  • 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 inner wall of the housing can be 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 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 an elastic jacket 18 surrounding its circumference, which is made of rubber, for example.
  • 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.
  • seal packings 46 are provided to seal the pump chamber 44 to 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 detachably 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 also attached to the shaft 12 in a torsionally elastic manner.
  • 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 shows how the play between the rotary piston 14 and the inner wall of the housing — here the semi-cylindrical shell 20 — can be compensated for by the invention.
  • adjusting pistons 62 are fastened to the inner wall of the elastic jacket surrounding the carrier 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, in which the adjusting pistons 62 engage, start from a central supply bore 66 which is machined axially into the shaft 12 carrying the rotary piston 14.
  • a sensor not shown, can be provided which controls a pump for the pressure medium as soon as a predetermined, permissible play 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 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)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (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, die aus je einem Trägerkörper und einem dessen Umfang umgebenden, elastischen Mantel bestehen.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 rotating, oppositely rotating rotary lobes are fastened in a housing on two mutually parallel shafts, each consisting of a carrier body and a circumference surrounding its circumference. elastic jacket exist.

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.

Aus der GB-A 781 240 ist eine Drehkolbenpumpe für die Förderung sehr heißer Flüssigkeiten bekannt, bei der zur einwandfreien Abdichtung auch bei großen Wärmedehnungen im hohen Temperaturbereich an der Gehäuseinnenseite zylindrische Schalen angeordnet sind, die von federnden Platten beaufschlagt werden.From GB-A 781 240 a rotary lobe pump for the conveyance of very hot liquids is known, in which cylindrical shells, which are acted upon by resilient plates, are arranged on the inside of the housing for perfect sealing even in the case of large thermal expansions in the high temperature range.

Gegenstand der GB-A 108 394 ist eine Zahnradpumpe für die Förderung von Schmieröl o. dgl. an Werkzeugmaschinen, deren Gehäuseinnenwände radial verstellt werden können, um ein auftretendes Spiel aufholen zu können, das während einer längeren Betriebsdauer durch Verschleiß verursacht worden ist.The subject of GB-A 108 394 is a gear pump for the delivery of lubricating oil or the like on machine tools, the inner walls of which can be adjusted radially in order to be able to make up for any play which has been caused by wear over a longer operating period.

Schließlich geht aus der US-A 4 137 024 ein Rotationskolbenverdichter hervor, bei dem der Rotor aus einem Trägerkörper und einem Mantel besteht, zwischen denen durch Federn beaufschlagte Druckplatten angeordnet sind.Finally, US Pat. No. 4,137,024 discloses a rotary piston compressor in which the rotor consists of a carrier body and a casing, between which spring-loaded pressure plates are arranged.

Der Erfindung liegt die Aufgabe zugrunde, eine Güllepumpe der eingangs umrissenen Bauart 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 further develop a slurry pump of the type outlined at the outset so that even after a long period of operation and wear on the outer jacket of the rotary lobes, any play between the piston and the housing which is caused thereby can be compensated for or the piston can be replaced quickly and easily.

Zur Lösung der Aufgabe ist erfindungsgemäß vorgesehen, daß zwischen dem Tragkörper und dem Mantel jedes Drehkolbens Verstellkolben angeordnet sind, die durch Druckmedium beaufschlagt werden können.To achieve the object, it is provided according to the invention that adjusting pistons are arranged between the support body and the jacket of each rotary piston and can be acted upon by pressure medium.

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.

Zusätzlich zu den erläuterten Maßnahmen kann die Innenwand des Gehäuses bezüglich der Achse des zugehörigen Drehkolbens radial beweglich sein. Mit dieser Maßnahme kann auch ein verhältnismäßig starker Verschleiß am Außenmantel des Drehkolbens aufgeholt werden, so daß die Pumpleistung nicht beeinträchtigt wird.In addition to the measures explained, the inner wall of the housing can be 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.

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.

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, die zwei Varianten für die radiale Verstellbarkeit der Gehäuseinnenwand zeigt,
  • Figur 2 einen teilweisen Axialschnitt in der Ebene 11 - 11 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 für eine Pumpe nach der Erfindung 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, which shows two variants for the radial adjustability of the housing inner wall,
  • FIG. 2 shows a partial axial section in the plane 11-11 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,
  • FIG. 5 shows another cross section of a rotary piston,
  • Figure 6 shows a rotary piston for a pump according to the invention in cross section with adjusting pistons 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.

Bei der Pumpe 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 pump of FIGS. 1 and 2, each rotary piston 14 consists of a fixed support body 16 and an elastic jacket 18 surrounding its circumference, which is made of rubber, for example.

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.

  • 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.
  • 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.
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.
  • 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 vorgesehen. 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 to 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.

Nach 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.According to 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 detachably 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.

Nach 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.According to FIG. 3, the rotary piston 14 is also attached to the shaft 12 in a torsionally elastic manner. 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.

Wie das Spiel zwischen dem Drehkolben 14 und der Innenwand des Gehäuses - hier der halbzylindrischen Schale 20 - nach der Erfindung 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 eingreifen, gehen von einer zentralen Versorgungsbohrung 66 aus, die axial in die den Drehkolben 14 tragende Welle 12 eingearbeitet ist.FIG. 6 shows how the play between the rotary piston 14 and the inner wall of the housing — here the semi-cylindrical shell 20 — can be compensated for by the invention. Here, adjusting pistons 62 are fastened to the inner wall of the elastic jacket surrounding the carrier 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, in which the adjusting pistons 62 engage, start from a central supply bore 66 which is machined axially 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.Can be used 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 play between the piston and the inner wall of the housing is exceeded.

Figur 7 zeigt ein Anwendungsbeispiel der Erfindung, bei dem zwei Drehkolbenpumpen 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.Figure 7 shows an application example of the invention, in which two rotary lobe pumps 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. 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).
2. Rotary piston pump according to Claim 1, characterized in that the adjustment pistons (62) are connected via delivery channels (64) to a supply bore (66) made in the associated shaft (12).
3. Rotary piston pump according to Claim 1, characterized in that each rotary piston (14) is secured in rotatably resilient manner on the shaft (12).
4. Rotary piston pump according to claim 3, characterized in that spring elements (60) are secured between the prismatic shaft (12) and the similarly prismatic receiving bore (58) of the rotary piston (14).
5. Rotary piston pump according to one of the preceding claims, characterized in that the rotary piston (14) is divided along at least one axial plane (52) and the piston parts are releasably connected to one another.
6. Rotary piston pump according to one of the preceding claims, characterized in that the inner wall of the housing (10) is radially movable with respect to the axis of the associated rotary piston (14).
7. Rotary piston pump according to claim 6, characterized in that the inner wall comprises shells (20) in the shape of part cylinders.
8. Rotary piston pump according to Claim 7, characterized in that each shell (20) is radially adjustable by means of adjusting screws (26).
9. Rotary piston pump according to Claim 7, characterized in that each shell (20) is radially adjustable by means of resilient elements (30).
10. Rotary piston pump according to Claim 7, characterized in that each shell (20) is radially adjustable by means of a pressure medium.
11. Rotary piston pump according to one of Claims 7 to 10, characterized in that each shell (20) has means (22) for its guidance during the radial movement.
12. Rotary piston pump according to one of the preceding claims, characterized in that the rotary piston (14) has axially running sealing strips (56) sliding on the inner wall of the housing (10).
13. Rotary piston pump according to one of the preceding claims, characterized in that at least one coaxial annular groove (50) is made in the end faces of each rotary piston (14), in which groove an annular sealing projection (48) secured on the housing (10) engages in the manner of a labyrinth.
14. Rotary piston pump according to one of the preceding claims, characterized in that a wear plate (42) is secured between the end faces of the rotary pistons (14) and the opposite inner wall of the housing (10).
15. Rotary piston pump according to one of the preceding claims, characterized in that a second, correspondingly constructed rotary piston pump is placed axially behind the rotary piston pump and its suction connection (32) leads to the pressure connection (34) of the first rotary piston 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)

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

Family

ID=8193952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85116283A Expired - Lifetime EP0225937B1 (en) 1984-07-24 1985-12-19 Rotary piston pump for conveying manure or the like

Country Status (3)

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

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN103201458A (en) * 2010-04-08 2013-07-10 奈赤-单体泵股份有限公司 Contact element for rotary piston pump
CN104136717A (en) * 2012-02-20 2014-11-05 奈赤－泵和系统有限责任公司 Rotary piston

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Publication number Priority date Publication date Assignee Title
ES2013417A6 (en) * 1989-03-30 1990-05-01 Inoxpa S A Housing for rotary pump.
EP0579863A1 (en) * 1992-07-24 1994-01-26 Koyo Technical Engineering Corporation Slurry removal 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
DE202010015439U1 (en) 2010-11-16 2012-02-17 Hugo Vogelsang Maschinenbau Gmbh Rotary pump and housing half shell for selbige

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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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103201458A (en) * 2010-04-08 2013-07-10 奈赤-单体泵股份有限公司 Contact element for rotary piston pump
CN104136717A (en) * 2012-02-20 2014-11-05 奈赤－泵和系统有限责任公司 Rotary piston
CN104136717B (en) * 2012-02-20 2016-11-16 耐驰泵及系统有限公司 Rotary-piston

Also Published As

Publication number Publication date
DE3579463D1 (en) 1990-10-04
ATE56076T1 (en) 1990-09-15
EP0225937A1 (en) 1987-06-24

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