EP0233859A1 - Self-priming centrifugal pump for handling liquids mixed with a high fiber content - Google Patents

Self-priming centrifugal pump for handling liquids mixed with a high fiber content Download PDF

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Publication number
EP0233859A1
EP0233859A1 EP87890027A EP87890027A EP0233859A1 EP 0233859 A1 EP0233859 A1 EP 0233859A1 EP 87890027 A EP87890027 A EP 87890027A EP 87890027 A EP87890027 A EP 87890027A EP 0233859 A1 EP0233859 A1 EP 0233859A1
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EP
European Patent Office
Prior art keywords
suction
centrifugal pump
channel
funnel
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87890027A
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German (de)
French (fr)
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EP0233859B1 (en
Inventor
Franz Dietmar Podesser
Wilhelm Dipl.-Ing. Wolfbauer
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Roehren und Pumpenwerk Bauer GmbH
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Roehren und Pumpenwerk Bauer GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/004—Priming of not self-priming pumps
    • F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating

Definitions

  • the invention relates to a self-priming centrifugal pump for processing and conveying liquids with a high fiber content, in particular with straw, feed residues or the like.
  • Slurry with a motor, a gear, a suction housing containing a return duct and a suction duct, a spiral housing, a pressure duct. a pressure chamber and a rotating S-shaped impeller with cutting edges arranged on the suction side, the impeller having an S-shaped twisted inlet blade in the extension of the impeller axis.
  • Centrifugal pumps for processing and conveying liquid manure with a high fiber content are known in practice. These pumps are difficult to handle, especially if the impeller is blocked by long-fiber slurry components, which usually occurs due to the poor size reduction of the solids.
  • Another disadvantage of the known pumps of the type mentioned above is that in order to clean the impeller from the long-fiber components, the pump housing usually has to be completely disassembled.
  • the object of the invention is to eliminate the disadvantages mentioned above and to design a self-priming centrifugal pump in such a way that simple handling and trouble-free operation of the self-priming centrifugal pump is ensured.
  • the invention solves the problem in that in the suction-side wall of the volute casing, a cutting disc cooperating with the impeller with counter cutting edges is arranged in that a funnel opening towards the suction channel, in the interior of which radial ribs extend, is arranged directly on the cutting disc, that the Inlet scoop protrudes into the funnel, the inlet scoop in combination with the radially extending ribs forming a tearing mechanism that a flow-regulating element, the diameter of the return channel, is arranged in the return duct, that the suction housing is pivotably arranged on the pump housing and that between Pressure channel, return channel and Pressure chamber an actuator is arranged.
  • the funnel has an odd number, preferably five, of radial ribs separated by regular spacings, and that the cross section of each radial rib forms an approximately oblique triangle, the longest side of which is connected to the funnel and the latter shortest side of the direction of rotation of the impeller is turned away.
  • Another feature of the invention is that the radial ribs flow smoothly at the suction-side opening of the funnel and connect on the impeller side to the counter-cutters of the cutting disk which are of the same cross-sectional shape.
  • the funnel is formed in one piece with the cutting disc, the radial ribs merging into the cutting disc and forming the counter-cutting edges for the impeller there.
  • the actuator comprises the element regulating the flow and can be actuated by a servomotor which can be activated by a control flap arranged between the pressure chamber and the pressure channel.
  • suction housing is pivotable about a vertical or horizontal axis.
  • 1 shows the centrifugal pump according to the invention in a sectional view along the line AA of FIG. 3; 2a shows the centrifugal pump according to the invention in a torn section along line BB of FIG. 1; 2b shows the centrifugal pump according to the invention in a section along the line BB of FIG. 1; 3 shows the centrifugal pump according to the invention in a sectional view along the line CC of Figure 1; and Figure 4 shows the centrifugal pump according to the invention in a section along the line DD of Figure 2b.
  • the self-priming centrifugal pump comprises a pump housing (1) and a suction housing (2) connected to it and connected to a suction line (not shown).
  • liquid is either introduced into the pump housing or the liquid remaining in the pump housing (1) is mixed with air in the area of the S-shaped impeller (3), which has blades (4) arranged on the suction side, and is mixed with air via the spiral housing ( 5) conveyed into the pressure chamber (6).
  • a control flap (8) weighted with a lever (7) protruding from the pump housing (1) is located between the pressure chamber (6) and the pressure port (9).
  • the liquid-air mixture is now vented in the pressure chamber (6), the air portion lifting the control flap briefly and slightly and escaping into the pressure port (9). Then the liquid flows via the return duct (10) back to the suction mouth of the impeller (3).
  • An actuator (12) arranged between the pressure chamber (6), the return channel (10) and the pressure channel (11) ensures that the connection between the pressure chamber and the pressure channel is closed in the suction position and the liquid is led into the return channel (10) (Fig. 4) .
  • the usually large return duct diameter can be arranged by a flow regulator which is arranged in the return duct (10) Element (13) can be reduced to a maximum of half.
  • This element is designed as a throttle and is equipped with different diameters depending on the task of the pump.
  • the element (13) can, however, just as well be designed as a slide.
  • the actuator (12) in such a way that, in addition to its function, it can take over that of the diameter-changing element (13).
  • the element (13) is shown with different diameters in dash-dot lines in FIGS. 2a, 2b.
  • control flap (8) is connected via a signal line (15) to a switch (16) arranged on the pump housing and to a servomotor (17) activating the actuator (12).
  • the liquid with a high fiber content enters the pipe (not shown) via a non-return valve (18) into the suction channel (19) of the suction housing (2) of the self-priming centrifugal pump.
  • the liquid then flows through a funnel (20) which is arranged in front of the rotating S-shaped impeller (3) and opens towards the suction channel.
  • the inside of the funnel (20) has an odd number of radially extending ribs (21) arranged at regular intervals.
  • the funnel (20) carrying the ribs (21) connects to a cutting disc (22) which is arranged on the impeller (3) and in the suction-side wall of the volute casing (5) and which carries counter cutting edges (23).
  • the impeller In the extension of the impeller axis, the impeller carries an S-shaped twisted inlet blade (24) projecting into the funnel (20).
  • the cross-section of the ribs (21) is approximately an oblique-angled triangle, the longest side of which is the one with which the triangle adjoins the inner wall of the funnel, and the shortest side of the rotating rack device of the impeller (3) is turned away.
  • the inlet blade thus forms a so-called tear mechanism with the radially extending ribs (21).
  • the fiber lumps coming up with the liquid are broken up between the edges of the inlet blade (24) and the ribs (21) and thus pre-shredded, which greatly relieves the next size reduction, which is carried out by the combination of impeller cutting (4) - counter-cutting (23), is guaranteed.
  • the suction housing (2) is pivotably arranged on the pump housing (1) either via a horizontal axis (25) (Fig.2a) or a vertical axis (26) (Fig.2b).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

1. Self priming centrifugal pump for treating and feeding liquids loaded with high proportion of fibres, particularly swill containing straw, feed residues or the like, with a motor, a gear box, a suction housing containing a return channel and a suction channel, a spiral housing, a pressure channel, a pressure space, and a rotating S-shaped paddle wheel with blades arranged on its suction side, wherein the paddle wheel has on the suction side in the projection of the paddle wheel axis an S-shaped twisted inlet paddle, characterised in that in the suction side wall of the spiral housing (5), there is arranged a cutting disc (22) with counterblades (23) cooperating with the paddle wheel (3), that directly against the cutting disc (22) there is arranged a funnel (20) opening towards the suction channel (19) in the interior space of which extend radial ribs (21), that the inlet paddle (24) projects into the funnel (20), wherein the inlet panel (24) in combination with the radially extending ribs (21) forms a shear unit, that in the return channel (10), there is arranged an element (13) changing the return channel (10) in its diameter controlling the throughflow in the return channel (10), that the suction housing (2) is swingably arranged on the pump housing (1) and between the pressure channel (11) return channel (10) and pressure space (6) an adjusting element (12) is arranged.

Description

Die Erfindung betrifft eine selbstansaugende Kreisel­pumpe zum Aufbereiten und Fördern von mit hohem Faseranteil durchsetzten Flüssigkeiten, insbesondere mit Stroh, Futter­resten oder dgl. behafteter Gülle, mit einem Motor, einem Getriebe, einem einen Rückführkanal und einen Saugkanal beinhaltendes Ansauggehäuse, einem Spiralgehäuse, einem Druckkanal, einem Druckraum und einem rotierenden s-förmi­gen Laufrad mit saugseitig angeordneten Schneiden, wobei das Laufrad saugseitig in der Verlängerung der Laufrad­achse eine s-förmig verdrehte Einlaufschaufel aufweist.The invention relates to a self-priming centrifugal pump for processing and conveying liquids with a high fiber content, in particular with straw, feed residues or the like. Slurry, with a motor, a gear, a suction housing containing a return duct and a suction duct, a spiral housing, a pressure duct. a pressure chamber and a rotating S-shaped impeller with cutting edges arranged on the suction side, the impeller having an S-shaped twisted inlet blade in the extension of the impeller axis.

Kreiselpumpen zum Aufbereiten und Fördern von Gülle mit hohem Faseranteil sind aus der Praxis her bekannt. Diese Pumpen weisen durchwegs eine schwierige Handhabung, vor allem bei Verstopfung des Laufrades durch langfasrige Güllebestandteile auf, welche meist aufgrund der schlechten Zerkleinerung der Feststoffe eintritt.
Ein weiterer Nachteil der bekannten Pumpen oben erwähnter Art ist, daß man, um das Laufrad von den langfasrigen Be­standteilen zu reinigen, meist das Pumpengehäuse voll­ständig zerlegen muß.Centrifugal pumps for processing and conveying liquid manure with a high fiber content are known in practice. These pumps are difficult to handle, especially if the impeller is blocked by long-fiber slurry components, which usually occurs due to the poor size reduction of the solids.
Another disadvantage of the known pumps of the type mentioned above is that in order to clean the impeller from the long-fiber components, the pump housing usually has to be completely disassembled.

Aufgabe der Erfindung ist es, die oben genannten Nach­teile zu beseitigen und eine selbstansaugende Kreiselpumpe so auszubilden, daß eine einfache Handhabung und ein stö­rungsfreier Betrieb der selbstansaugenden Kreiselpumpe ge­währleistet ist.The object of the invention is to eliminate the disadvantages mentioned above and to design a self-priming centrifugal pump in such a way that simple handling and trouble-free operation of the self-priming centrifugal pump is ensured.

Die Erfindung löst die Aufgabe dadurch, daß in der saugseitigen Wand des Spiralgehäuses eine mit dem Lauf­rad zusammenwirkende Schneidscheibe mit Gegenschneiden angeordnet ist, daß unmittelbar an die Schneidscheibe ein sich zum Saugkanal hin öffnender Trichter, in dessen Innen­raum sich radial Rippen erstrecken angeordnet ist, daß die Einlaufschaufel in den Trichter hineinragt, wobei die Einlaufschaufel in Kombination mit den sich radial er­streckenden Rippen ein Reißwerk bildet, daß im Rückführ­kanal ein den Durchfluß regelndes, den Rückführkanal in seinem Durchmesser veränderndes Element angeordnet ist, daß das Ansauggehäuse am Pumpengehäuse schwenkbar ange­ordnet ist und daß zwischen Druckkanal, Rückführkanal und Druckraum ein Stellorgan angeordnet ist. Ein weiteres Merkmal der Erfindung ist es, daß der Trichter eine unge­rade Anzahl, vorzugsweise fünf, durch regelmäßige Abstände voneinander getrennter radialer Rippen aufweist, und daß der Querschnitt einer jeden radialen Rippe annähernd ein schiefwinkeliges Dreieck bildet, dessen längste Seite mit dem Trichter verbunden und dessen kürzeste Seite der Dreh­richtung des Laufrades abgewandt ist.The invention solves the problem in that in the suction-side wall of the volute casing, a cutting disc cooperating with the impeller with counter cutting edges is arranged in that a funnel opening towards the suction channel, in the interior of which radial ribs extend, is arranged directly on the cutting disc, that the Inlet scoop protrudes into the funnel, the inlet scoop in combination with the radially extending ribs forming a tearing mechanism that a flow-regulating element, the diameter of the return channel, is arranged in the return duct, that the suction housing is pivotably arranged on the pump housing and that between Pressure channel, return channel and Pressure chamber an actuator is arranged. Another feature of the invention is that the funnel has an odd number, preferably five, of radial ribs separated by regular spacings, and that the cross section of each radial rib forms an approximately oblique triangle, the longest side of which is connected to the funnel and the latter shortest side of the direction of rotation of the impeller is turned away.

Ein anderes Merkmal der Erfindung ist es, daß an der saugseitigen Öffnung des Trichters die radialen Rippen fließend auslaufen und laufradseitig an die mit glei­cher Querschnittsform ausgebildeten Gegenschneiden der Schneidscheibe anschließen.Another feature of the invention is that the radial ribs flow smoothly at the suction-side opening of the funnel and connect on the impeller side to the counter-cutters of the cutting disk which are of the same cross-sectional shape.

Ein weiteres, anderes Merkmal der Erfindung ist es, daß der Trichter mit der Schneidscheibe einstückig ausge­bildet ist, wobei die radialen Rippen in die Schneid­scheibe übergehen und dort die Gegenschneiden für das Lauf­rad bilden.Another, other feature of the invention is that the funnel is formed in one piece with the cutting disc, the radial ribs merging into the cutting disc and forming the counter-cutting edges for the impeller there.

Ein anderes Merkmal der Erfindung ist es, daß das Stellorgan das den Durchfluß regelnde Element umfaßt und über einen von einer zwischen Druckraum und Druckkanal angeordneten Steuerklappe aktivierbaren Stellmotor be­tätigbar ist.Another feature of the invention is that the actuator comprises the element regulating the flow and can be actuated by a servomotor which can be activated by a control flap arranged between the pressure chamber and the pressure channel.

Ein weiteres Merkmal der Erfindung ist es, daß das Ansauggehäuse um eine vertikale oder horizontale Achse schwenkbar ist.Another feature of the invention is that the suction housing is pivotable about a vertical or horizontal axis.

Die Erfindung wird im folgenden anhand eines Aus­führungsbeispieles mit Hilfe der angeschlossenen Zeichnung näher beschrieben.
Es zeigen Fig.1 die erfindungsgemäße Kreiselpumpe in einer Schnittdarstellung entlang der Linie A-A der Fig.3; Fig.2a die erfindungsgemäße Kreiselpumpe in einem abgerissenen Schnitt entland der Linie B-B der Fig.1; Fig.2b die er­findungsgemäße Kreiselpumpe in einem Schnitt entlang der Linie B-B der Fig.1; Fig.3 die erfindungsgemäße Kreisel­pumpe in einer Schnittdarstellung entlang der Linie C-C der Fig.1; und Fig.4 die erfindungsgemäße Kreiselpumpe in einem Schnitt entlang der Linie D-D der Fig.2b.The invention is described below with reference to an embodiment with the help of the attached drawing.
1 shows the centrifugal pump according to the invention in a sectional view along the line AA of FIG. 3; 2a shows the centrifugal pump according to the invention in a torn section along line BB of FIG. 1; 2b shows the centrifugal pump according to the invention in a section along the line BB of FIG. 1; 3 shows the centrifugal pump according to the invention in a sectional view along the line CC of Figure 1; and Figure 4 shows the centrifugal pump according to the invention in a section along the line DD of Figure 2b.

Die selbstansaugende Kreiselpumpe unfaßt ein Pumpen­gehäuse (1) und ein an dieses anschließendes, mit einer nicht gezeigten Saugleitung verbundenes Ansauggehäuse (2). Bei Inbetriebnahme der Pumpe wird entweder Flüssigkeit in das Pumpengehäuse eingebracht oder die noch im Pumpenge­häuse (1) verbliebene Flüssigkeit im Bereich des s-förmig ausgebildeten Laufrades (3), welches saugseitig angeordne­te Schneiden (4) aufweist, mit Luft vermischt und über das Spiralgehäuse (5) in den Druckraum (6) gefördert. Eine mit einem aus dem Pumpengehäuse (1) ragenden Hebel (7) gewichts­belastete Steuerklappe (8) befindet sich zwischen dem Druck­raum (6) und dem Druckstutzen (9). Das Flüssigkeit-Luft-Ge­misch wird nun im Druckraum (6) entlüftet, wobei der Luft­anteil die Steuerklappe kurzzeitig und geringfügig anhebt und in den Druckstutzen (9) entweicht. Sodann strömt die Flüssigkeit über den Rückführkanal (10) zurück zum Saugmund des Laufrades (3).The self-priming centrifugal pump comprises a pump housing (1) and a suction housing (2) connected to it and connected to a suction line (not shown). When the pump is started up, liquid is either introduced into the pump housing or the liquid remaining in the pump housing (1) is mixed with air in the area of the S-shaped impeller (3), which has blades (4) arranged on the suction side, and is mixed with air via the spiral housing ( 5) conveyed into the pressure chamber (6). A control flap (8) weighted with a lever (7) protruding from the pump housing (1) is located between the pressure chamber (6) and the pressure port (9). The liquid-air mixture is now vented in the pressure chamber (6), the air portion lifting the control flap briefly and slightly and escaping into the pressure port (9). Then the liquid flows via the return duct (10) back to the suction mouth of the impeller (3).

Ein zwischen Druckraum (6), Rückführkanal (10) und Druckkanal (11) angeordnetes Stellorgan (12) gewährleistet, daß in der Ansaugstellung die Verbindung Druckraum-Druck­kanal verschlossen ist und die Flüssigkeit in den Rückführ­kanal (10) geleitet wird (Fig.4).
Um zu verhindern, daß die zurückfließende, bereits entlüfte­te Flüssigkeit aus dem Druckraum (6) wieder Luft mitreißt, wodurch die Vakuumerzeugung behindert und somit auch die Ansaughöhe vermindert wird, kann der üblicherweise große Rückführkanaldurchmesser durch ein im Rückführkanal (10) angeordnetes, den Durchfluß regelndes Element (13) bis maxi­mal auf die Hälfte reduziert werden.An actuator (12) arranged between the pressure chamber (6), the return channel (10) and the pressure channel (11) ensures that the connection between the pressure chamber and the pressure channel is closed in the suction position and the liquid is led into the return channel (10) (Fig. 4) .
In order to prevent the flowing back, already vented liquid from the pressure chamber (6) from carrying air again, which hinders the generation of vacuum and thus also reduces the suction head, the usually large return duct diameter can be arranged by a flow regulator which is arranged in the return duct (10) Element (13) can be reduced to a maximum of half.

Dieses Element ist als Drossel ausgebildet und wird je nach Aufgabe der Pumpe mit verschiedenen Durchmessern ausge­stattet. Das Element (13) kann aber ebensogut als Schieber ausgebildet sein. Es besteht darüber hinaus auch noch die Möglichkeit, das Stellorgan (12) derart auszubilden, daß es zusätzlich zu seiner Funktion jene des den Durchmesser ver­ändernden Elementes (13) übernehmen kann.
Das Element (13) ist mit verschieden ausgebildeten Durch­messern in den Fig.2a, 2b strichpunktiert dargestellt.This element is designed as a throttle and is equipped with different diameters depending on the task of the pump. The element (13) can, however, just as well be designed as a slide. There is also the possibility of designing the actuator (12) in such a way that, in addition to its function, it can take over that of the diameter-changing element (13).
The element (13) is shown with different diameters in dash-dot lines in FIGS. 2a, 2b.

Die Zirkulation der sich im Pumpengehäuse befinden­den Flüssigkeit wird so lange fortgesetzt, bis die Saug­leitung und die Saugseite der Pumpe vollständig entlüftet ist, was dem Abschluß des Ansaugvorganges entspricht. Durch den Flüssigkeitsdruck öffnet die Steuerklappe (8) und schwenkt um nahezu 90° (Fig.3). Durch die damit ver­änderte Stellung des Hebels (7) wird an der Pumpenaußen­seite der Abschluß des Ansaugvorganges signalisiert, wo­rauf das Stellorgan (12) mittels des Hebels (14) in die Pumpstellung zu bringen ist (Fig.4 strichpunktierte Dar­stellung). In dieser Stellung ist der Druckraum (6) mit dem Druckkanal (11) verbunden.
Das Umschalten des Stellorganes kann händisch, aber auch automatisch, d.h. elektromechanisch erfolgen, wie in Fig.3 schematisch dargestellt. Dazu ist die Steuerklappe (8) über eine Signalleitung (15) mit einem am Pumpengehäuse angeordneten Schalter (16) und einem das Stellorgan (12) aktivierenden Stellmotor (17) verbunden.
Im Pumpbetrieb tritt die mit hohem Faseranteil durchsetzte Flüssigkeit aus der nicht gezeigten Rohrleitung über eine Rückschlagklappe (18) in den Saugkanal (19) des Ansaug­gehäuses (2) der selbstansaugenden Kreiselpumpe ein. So­dann strömt die Flüssigkeit durch einen vor dem rotierenden s-förmigen Laufrad (3) angeordneten, sich zum Saugkanal hin öffnenden Trichter (20).The circulation of the liquid in the pump housing is continued until the suction line and the suction side of the pump are completely vented, which corresponds to the completion of the suction process. Due to the liquid pressure, the control flap (8) opens and swivels by almost 90 ° (Fig. 3). Due to the changed position of the lever (7), the completion of the suction process is signaled on the outside of the pump, whereupon the actuator (12) is brought into the pumping position by means of the lever (14) (Fig. 4 dash-dotted line). In this position, the pressure chamber (6) is connected to the pressure channel (11).
The actuator can be switched over manually, but also automatically, ie electromechanically, as shown schematically in FIG. For this purpose, the control flap (8) is connected via a signal line (15) to a switch (16) arranged on the pump housing and to a servomotor (17) activating the actuator (12).
In the pumping mode, the liquid with a high fiber content enters the pipe (not shown) via a non-return valve (18) into the suction channel (19) of the suction housing (2) of the self-priming centrifugal pump. The liquid then flows through a funnel (20) which is arranged in front of the rotating S-shaped impeller (3) and opens towards the suction channel.

Der Trichter (20) weist an seiner Innenseite eine unge­rade Anzahl von in regelmäßigen Abständen angeordneter, sich radial erstreckender Rippen (21) auf.The inside of the funnel (20) has an odd number of radially extending ribs (21) arranged at regular intervals.

Der die Rippen (21) tragende Trichter (20) schließt an eine am Laufrad (3) sowie in der saugseitigen Wand des Spiralgehäuses (5) angeordnete Schneidscheibe (22) an, welche Gegenschneiden (23) trägt. In der Verlängerung der Laufradachse trägt das Laufrad eine s-förmig verdrehte, in den Trichter (20) hineinragende Einlaufschaufel (24). Die Rippen (21) sind vom Querschnitt her annähernd als schiefwinkeliges Dreieck ausgebildet, wobei dessen längste Seite jene ist, mit welcher das Dreieck an die Trichter­innenwand anschließt, und die kürzeste Seite der Drehrich­ tung des Laufrades (3) abgewandt ist. Die Einlaufschau­fel bildet somit mit den sich radial erstreckenden Rippen (21) ein sogenanntes Reißwerk. Die mit der Flüssigkeit herankommenden Faserklumpen werden zwischen den Kanten der Einlaufschaufel (24) und den Rippen (21) zerschlagen und somit vorzerkleinert, wodurch eine große Entlastung der nächsten Zerkleinerungsstufe, welche von der Kombi­nation Laufradschneiden (4) - Gegenschneiden (23) durch­geführt wird, gewährleistet ist.The funnel (20) carrying the ribs (21) connects to a cutting disc (22) which is arranged on the impeller (3) and in the suction-side wall of the volute casing (5) and which carries counter cutting edges (23). In the extension of the impeller axis, the impeller carries an S-shaped twisted inlet blade (24) projecting into the funnel (20). The cross-section of the ribs (21) is approximately an oblique-angled triangle, the longest side of which is the one with which the triangle adjoins the inner wall of the funnel, and the shortest side of the rotating rack device of the impeller (3) is turned away. The inlet blade thus forms a so-called tear mechanism with the radially extending ribs (21). The fiber lumps coming up with the liquid are broken up between the edges of the inlet blade (24) and the ribs (21) and thus pre-shredded, which greatly relieves the next size reduction, which is carried out by the combination of impeller cutting (4) - counter-cutting (23), is guaranteed.

Durch diese Vorzerkleinerung der Feststoffe im Reiß­werk wird auch verhindert, daß sich an der Einlauf­schaufel (24) ein aus langfasrigen Flüssigkeitsbestand­teilen gebildetes Knäuel festsetzt, mit dieser mitrotiert und damit die Pumpe außer Betrieb setzt.
Es ist konstruktiv auch möglich, den Trichter (20) und die Schneidscheibe (22) aus einem Stück und somit auch aus einem Material herzustellen. Die Rippen (21) gehen dabei nahtlos in die Gegenschneiden (23) über.
Das Ansauggehäuse (2) ist am Pumpengehäuse (1) entweder über eine horizontale Achse (25) (Fig.2a) oder eine verti­kale Achse (26) (Fig.2b) schwenkbar angeordnet.This pre-crushing of the solids in the tearing mechanism also prevents a ball of long-fiber liquid constituents from sticking to the inlet blade (24), rotating with it and thus putting the pump out of operation.
It is also structurally possible to manufacture the funnel (20) and the cutting disc (22) from one piece and thus also from one material. The ribs (21) merge seamlessly into the counter cutting edges (23).
The suction housing (2) is pivotably arranged on the pump housing (1) either via a horizontal axis (25) (Fig.2a) or a vertical axis (26) (Fig.2b).

Zum Wegschwenken ist lediglich das Loslösen einer ein­zigen Fixierschraube (27) notwendig.
Die jeweilige konstruktive Ausführung mit einer dieser Schwenkachsen ist durch den Verwendungszweck der Pumpe bedingt.
Findet beispielsweise die Pumpe als Traktorgetriebepumpe Verwendung, also beim Vorhandensein einer an das Ansaug­gehäuse (2) mit Hilfe einer nicht gezeigten Schnellver­schlußkupplung angekuppelten flexiblen Saugleitung, so wird das Ansauggehäuse nach dem Abkuppeln der flexiblen Leitung um eine vertikale Achse (26) (Fig.2b) wegge­schwenkt.
Beim Einsatz der Pumpe als Industriepumpe, d.h. bei Ver­bindung mit einer starren Saugleitung über Normflansche, wird das Ansauggehäuse (2) nach dem Lösen der Saugleitung um eine horizontale Achse (25) geschwenkt.
Durch dieses einfache Loslösen des Ansauggehäuses (2) vom Pumpengehäuse (1) kann man mit wenigen Handgriffen zum Laufrad (3) sowie auch zum Stellorgan (12) gelangen, um diese einer eventuellen Reinigung zu unterziehen, wogegen herkömmliche Pumpen dazu einer Zerlegung ihres kompletten Gehäuses bedürfen.All that is required to pivot away is the loosening of a single fixing screw (27).
The respective design with one of these swivel axes depends on the intended use of the pump.
If, for example, the pump is used as a tractor gear pump, i.e. if there is a flexible suction line coupled to the intake housing (2) with the help of a quick-release coupling (not shown), the intake housing is decoupled about a vertical axis (26) (Fig. 2b) after the flexible line has been uncoupled. swung away.
When using the pump as an industrial pump, ie when connecting to a rigid suction line via standard flanges, the suction housing (2) is pivoted about a horizontal axis (25) after the suction line is released.
By simply detaching the suction housing (2) from The pump housing (1) can be reached in a few simple steps from the impeller (3) and the actuator (12) to be cleaned, whereas conventional pumps require the entire housing to be dismantled.

Claims (8)

1. Selbstansaugende Kreiselpumpe zum Aufbereiten und Fördern von mit hohem Faseranteil durchsetzten Flüssig­keiten, insbesonders mit Stroh, Futterresten oder dgl. be­hafteter Gülle, mit einem Motor, einem Getriebe, einem einen Rückführkanal und einen Saugkanal beinhaltendes An­sauggehäuse, einem Spiralgehäuse, einem Druckkanal, einem Druckraum und einem rotierenden s-förmigen Laufrad mit saugseitig angeordneten Schneiden, wobei das Laufrad saug­seitig in der Verlängerung der Laufradachse eine s-förmig verdrehte Einlaufschaufel aufweist, dadurch gekennzeichnet, daß in der saugseitigen Wand des Spiralgehäuses (5) eine mit dem Laufrad (3) zusammenwirkende Schneidscheibe (22) mit Gegenschneiden (23) angeordnet ist, daß unmittelbar an die Schneidscheibe (22) ein sich zum Saugkanal (19) hin öffnender Trichter (20), in dessen Innenraum sich radial Rippen (21) erstrecken angeordnet ist, daß die Einlauf­schaufel (24) in den Trichter (20) hineinragt, wobei die Einlaufschaufel (24) in Kombination mit den sich radial erstreckenden Rippen (21) ein Reißwerk bildet, daß im Rück­führkanal (10) ein den Durchfluß regelndes, den Rückführ­kanal (10) in seinem Durchmesser veränderndes Element (13) angeordnet ist, daß das Ansauggehäuse (2) am Pumpengehäuse (1) schwenkbar angeordnet ist und daß zwischen Druckkanal (11), Rückführkanal (10) und Druckraum (6) ein Stellorgan (12) angeordnet ist.1.Self-priming centrifugal pump for processing and conveying liquids with a high fiber content, in particular with straw, feed residues or similar manure, with a motor, a gearbox, a suction housing containing a return duct and a suction duct, a spiral housing, a pressure duct, a pressure chamber and a rotating S-shaped impeller with cutting edges arranged on the suction side, the impeller on the suction side in the extension of the impeller axis having an S-shaped twisted inlet blade, characterized in that in the suction-side wall of the volute casing (5) one cooperating with the impeller (3) The cutting disc (22) with counter cutting edges (23) is arranged in such a way that a funnel (20) which opens towards the suction channel (19) and in the interior of which radial ribs (21) extend is arranged directly on the cutting disc (22) such that the inlet blade (24) protrudes into the funnel (20), the inlet scoop (24) in combination forms a tear mechanism with the radially extending ribs (21) that an element (13) regulating the flow and changing the diameter of the return channel (10) is arranged in the return channel (10) such that the suction housing (2) on the pump housing (1 ) is arranged pivotably and that an actuator (12) is arranged between the pressure channel (11), return channel (10) and pressure chamber (6). 2. Kreiselpumpe nach Anspruch 1, dadurch gekennzeich­net, daß der Trichter (20) eine ungerade Anzahl, vorzugs­weise fünf, durch regelmäßige Abstände voneinander getrenn­ter radialer Rippen (21) aufweist.2. Centrifugal pump according to claim 1, characterized in that the funnel (20) has an odd number, preferably five, of radial ribs (21) separated from one another by regular distances. 3. Kreiselpumpe nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß der Querschnitt einer jeden radialen Rippe (21) annähernd ein schiefwinkeliges Dreieck bildet, dessen längste Seite mit dem Trichter (20) verbunden und dessen kürzeste Seite der Drehrichtung des Laufrades (3) abgewandt ist.3. Centrifugal pump according to claims 1 or 2, characterized in that the cross section of each radial rib (21) approximately forms an oblique triangle, the longest side of which is connected to the funnel (20) and the shortest side of the direction of rotation of the impeller (3) is turned away. 4. Kreiselpumpe nach einem der Ansprüche 1 bis 3, da­durch gekennzeichnet, daß an der saugseitigen Öffnung des Trichters (20) die radialen Rippen (21) fließend auslau­fen und laufradseitig an die mit gleicher Querschnitts­form ausgebildeten Gegenschneiden (23) der Schneidscheibe (22) anschließen.4. Centrifugal pump according to one of claims 1 to 3, characterized in that at the suction opening of the Funnel (20), the radial ribs (21) flow out smoothly and connect on the impeller side to the counter-cutters (23) of the cutting disc (22) which have the same cross-sectional shape. 5. Kreiselpumpe nach einem der Ansprüche 1 bis 4, da­durch gekennzeichnet, daß der Trichter (20) mit der Schneidscheibe (22) einstückig ausgebildet ist, wobei die radialen Rippen (21) in die Schneidscheibe (22) übergehen und dort die Gegenschneiden (23) für das Laufrad (3) bil­den.5. Centrifugal pump according to one of claims 1 to 4, characterized in that the funnel (20) with the cutting disc (22) is integrally formed, wherein the radial ribs (21) merge into the cutting disc (22) and there the counter cutting edges (23rd ) for the impeller (3). 6. Kreiselpumpe nach Anspruch 1, dadurch gekennzeich­net, daß das Stellorgan (12) das den Durchfluß regelnde Element (13) umfaßt.6. Centrifugal pump according to claim 1, characterized in that the actuator (12) comprises the flow regulating element (13). 7. Kreiselpumpe nach Anspruch 1, dadurch gekennzeich­net, daß das Ansauggehäuse (2) um eine vertikale (26) oder horizontale (25) Achse schwenkbar ist.7. Centrifugal pump according to claim 1, characterized in that the suction housing (2) about a vertical (26) or horizontal (25) axis is pivotable. 8. Kreiselpumpe nach Anspruch 1, dadurch gekennzeich­net, daß das Stellorgan (12) über einen von einer zwischen Druckraum (6) und Druckkanal (11) angeordneten Steuerklappe (8) aktivierbaren Stellmotor (17) betätigbar ist.8. Centrifugal pump according to claim 1, characterized in that the actuator (12) via one of a pressure chamber (6) and pressure channel (11) arranged control flap (8) activatable actuator (17) can be actuated.
EP19870890027 1986-02-14 1987-02-12 Self-priming centrifugal pump for handling liquids mixed with a high fiber content Expired - Lifetime EP0233859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT393/86 1986-02-14
AT39386 1986-02-14

Publications (2)

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EP0233859A1 true EP0233859A1 (en) 1987-08-26
EP0233859B1 EP0233859B1 (en) 1990-10-17

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EP19870890027 Expired - Lifetime EP0233859B1 (en) 1986-02-14 1987-02-12 Self-priming centrifugal pump for handling liquids mixed with a high fiber content

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EP (1) EP0233859B1 (en)
DE (1) DE3765552D1 (en)
ES (1) ES2015517B3 (en)
GR (1) GR3000963T3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6951445B2 (en) 2001-06-13 2005-10-04 Weir Warman Ltd Apparatus for use in slurry pumps
EP1584820A1 (en) * 2004-04-07 2005-10-12 Frideco AG Mixed flow pump
AU2002304980B2 (en) * 2001-06-13 2006-11-23 Weir Minerals Australia Ltd Apparatus for use in slurry pumps
NL1036463C2 (en) * 2009-01-26 2009-12-08 Piet Van Der Ende Modification method to make pump self priming, comprises Y pieces for pressure and suction regions, water trap, return line and membrane or electrical closure valve in bypass

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008057849A1 (en) * 2008-11-18 2010-05-20 Wilo Se Cutting device for e.g. sewage pump, has cutting body coaxially surrounded by fixed cutting ring, where annular gap between cutting body and ring decreases in its width from inlet aperture to rotor in opening region close to pump inlet

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DE2107069A1 (en) * 1971-02-15 1972-08-24 Franz Eisele & Söhne, 7481 Laiz Inlet nozzle on vertical slurry pumps
FR2333140A1 (en) * 1975-11-29 1977-06-24 Blum Albert PUMP FOR WASTE WATER OR DRAIN
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BE442921A (en) *
US2047329A (en) * 1933-02-02 1936-07-14 R G Wright & Co Pump or the like and driving means therefor
DE761439C (en) * 1939-01-27 1953-03-16 Bernard Moteurs Device for venting when starting centrifugal pumps
US2371681A (en) * 1943-01-18 1945-03-20 Jr Augustus C Durdin Centrifugal cutting pump
CH241206A (en) * 1945-01-16 1946-02-28 Haeny & Cie Self-priming centrifugal pump for winery operations.
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GB1016003A (en) * 1961-04-28 1966-01-05 English Electric Co Ltd Improvements in or relating to pumping apparatus
CH447823A (en) * 1965-03-29 1967-11-30 Smedegaard As centrifugal pump
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DE2059616A1 (en) * 1969-12-03 1971-06-16 Lehtinen Sulo Antero Centrifugal pump, especially for pumping waste water containing solids
DE2107069A1 (en) * 1971-02-15 1972-08-24 Franz Eisele & Söhne, 7481 Laiz Inlet nozzle on vertical slurry pumps
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GB2077606A (en) * 1980-06-11 1981-12-23 Haigh Eng Co Ltd Macerator pumping impeller

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6951445B2 (en) 2001-06-13 2005-10-04 Weir Warman Ltd Apparatus for use in slurry pumps
AU2002304980B2 (en) * 2001-06-13 2006-11-23 Weir Minerals Australia Ltd Apparatus for use in slurry pumps
EP1584820A1 (en) * 2004-04-07 2005-10-12 Frideco AG Mixed flow pump
WO2005098237A1 (en) * 2004-04-07 2005-10-20 Frideco Ag Screw-centrifugal pump
JP2007532812A (en) * 2004-04-07 2007-11-15 フリデコ アクチェンゲゼルシャフト Screw centrifugal pump
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US7510368B2 (en) 2004-04-07 2009-03-31 Frideco Ag Screw-centrifugal pump
NL1036463C2 (en) * 2009-01-26 2009-12-08 Piet Van Der Ende Modification method to make pump self priming, comprises Y pieces for pressure and suction regions, water trap, return line and membrane or electrical closure valve in bypass

Also Published As

Publication number Publication date
EP0233859B1 (en) 1990-10-17
DE3765552D1 (en) 1990-11-22
GR3000963T3 (en) 1991-12-10
ES2015517A4 (en) 1990-09-01
ES2015517B3 (en) 1991-04-16

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