EP2002121B1 - Piston pump for thick matter - Google Patents

Piston pump for thick matter Download PDF

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Publication number
EP2002121B1
EP2002121B1 EP07723523A EP07723523A EP2002121B1 EP 2002121 B1 EP2002121 B1 EP 2002121B1 EP 07723523 A EP07723523 A EP 07723523A EP 07723523 A EP07723523 A EP 07723523A EP 2002121 B1 EP2002121 B1 EP 2002121B1
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EP
European Patent Office
Prior art keywords
feed
piston
piston pump
pressure
ring
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Not-in-force
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EP07723523A
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German (de)
French (fr)
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EP2002121A1 (en
Inventor
Matthias Stabel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Putzmeister Concrete Pumps GmbH
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Putzmeister Solid Pumps GmbH
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Publication of EP2002121A1 publication Critical patent/EP2002121A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous

Definitions

  • the invention relates to a Piston pump for thick materials with at least one motorized or hydraulically driven delivery piston containing delivery cylinder having a mouth opening, which communicates in accordance with the movement of the delivery piston slide-controlled alternately with the interior of a material feed container and with a pressure conveying line.
  • Piston pumps of this type are used for conveying solid-liquid mixtures with a high solids content, such as sewage sludge, coal sludge, biomass or concrete. Such thick materials have a high internal friction, so that the degree of filling of the delivery cylinder often leaves something to be desired during the suction process.
  • piston pumps of this type EP-B-633 863
  • piston pumps of this type in the promotion of thick materials to reduce the wall friction at the entrance of the pressure conveying line to introduce a lubricant between the slurry strand and the wall of the pressure conveying line. This is usually done continuously and proportionally to the flow in metered quantity, with the result that forms an interface between the pipe inner wall and the thick matter strand through which the delivery pressure can be reduced.
  • a pre-pressing device is usually provided in the region of the material supply container, with which the filling pressure can be increased by at least 1 bar. In many cases, however, this is not enough.
  • the present invention seeks to improve the known piston pump for thick materials in that even at high Solid contents in the thick material of the degree of filling in the delivery cylinder can be significantly increased.
  • the solution according to the invention is based on the idea that in the region of the orifice, an annular nozzle opening into the delivery cylinder is arranged, which is connected to an external pressure line, wherein the pressure line can be acted upon by a high-pressure pump with a lubricant.
  • the pressure line is connected via a arranged in the mouth region of the delivery cylinder bore to an opening into the annular nozzle annular channel.
  • a preferred structural embodiment of the invention provides that the delivery cylinder carries an outer ring having at least one leading to the annular nozzle ring channel outside the pressure line connected to the bore, wherein the annular channel on the inside by an outer surface of the delivery cylinder or an axially adjacent to this inner ring and is bounded on the outside by an inner surface of the outer ring.
  • said inner ring engages in an inwardly open recess of the outer ring and limits together with this the annular channel and the annular nozzle.
  • the inner ring is advantageously clamped with a rear, radially projecting collar between two mutually facing annular surfaces of the delivery cylinder and the outer ring body.
  • the annular channel expediently has at least one annular Cross-sectional expansion before.
  • two spaced apart annular cross-sectional extensions are provided.
  • control valve responsive to the position and / or the stroke direction of the delivery piston in the delivery cylinder control means and arranged in the pressure line, responsive to an output of the control means control valve is provided which opens during the suction stroke of the delivery piston and closes before the pressure stroke.
  • the control valve is expediently formed as preferably via the delivery piston magnetically controllable directional control valve.
  • a preferred embodiment of the invention provides that two in each case an annular nozzle having delivery cylinder are provided in its mouth region, the annular nozzles are acted upon by the control valve with lubricant during each suction stroke of the push-pull controlled delivery piston.
  • the invention also relates to a method for operating a piston pump for thick materials, in which in a suction stroke thick matter material is sucked into a delivery cylinder open on one side and pressed in a subsequent pressure stroke from the delivery cylinder in a pressure conveying line.
  • a lubricant be injected into the delivery cylinder with each suction stroke.
  • the lubricant is advantageously injected into the separation area between the thick material and delivery cylinder inner surface, over its entire circumference.
  • the lubricant injection is interrupted during the pressure stroke appropriate.
  • the lubricant is injected with an overpressure relative to the thick stock arranged in the delivery cylinder.
  • the injection pressure is expediently more than 50, preferably about 100 bar, during the prepressing pressure in the thick material at the suction stroke is appropriate at about 2 bar.
  • a preferred embodiment of the invention provides that in the case of a two-cylinder piston pump, the piston in a first and a second delivery cylinder are driven in push-pull execution of a suction stroke and a pressure stroke, wherein in the delivery cylinder at each suction stroke, a lubricant is injected and the lubricant injection is interrupted during the respective printing stroke.
  • the lubricant layer forming in the delivery cylinder is taken into the pressure feed line, so that in a first line section adjoining the thick matter pump an additional lubricant injection is dispensed with. Only with long pressure conveying lines with more than 50 to 100 m in length can be injected at a distance from the sludge pump additional lubricant in the pressure conveying line. While the lubricant is injected into the delivery cylinder only during the suction stroke, the lubricant injection into the delivery conduit should be continuous.
  • FIG. 1 schematically illustrated two-cylinder slurry pump is intended to promote solids-rich thick matter, such as partially dewatered sewage sludge, coal dust sludge or concrete.
  • the piston pump consists essentially of a material feed container 10, two with their frontal orifices 12 via wall openings 14 connected to the material feed container 10 feed cylinders 16, two in the feed cylinders 16 in push-pull via hydraulic drive cylinder 18 drivable delivery piston 20 and one between the drive cylinders 18 and the delivery cylinders
  • a pipe slide 21 is arranged, which is connected with its inlet opening 26 alternately to the mouth opening 12 of the delivery cylinder whose piston performs a pressure stroke, and the mouth opening 12 of the other delivery cylinder whose piston performs a suction stroke, leaves free, and the outlet opening 28 is connected via a arranged on the material supply container 10 discharge nozzle 30 to a pressure conveying line, not shown.
  • the pipe slide 24 has a pivotable within the material feed container 10, S-shaped curved pivot tube. Accordingly, at each suction stroke high-viscosity material from the interior of the material feed container 10 optionally under the exercise of a pre-pressure on the open mouth opening 12 in the respective delivery cylinder 16, while in the other delivery cylinder 16, there located thick material through the delivery piston 20 under execution of a pressure stroke on the pivot tube the pipe slide 24 and the discharge nozzle 30 is pressed into the subsequent pressure conveying pipe.
  • a special feature of the invention is that in the region of the mouth opening 12, an annular nozzle 32 is arranged, which can be acted upon by pressure pipes 34 holes 36 and an annular channel 38 with a lubricant under a pressure of about 50 to 100 bar.
  • an inner tube 40 which is overlapped by an outer tube 42 screwed onto the delivery cylinder 16, adjoins the delivery cylinder 16 in the region of the orifice opening 12 axially.
  • the inner ring 40 on a radially projecting collar 44 which is clamped between an annular surface 46 of the outer tube 42 and the end face annular surface 48 of the conveyor cylinder 16 so that the annular nozzle 32 and the annular channel 38 between the inner tube and outer tube remains open.
  • the holes 36 for the lubricant supply are arranged in the outer tube 42.
  • the inner tube 40 has on its annular surface 38 bounding the inner surface of two annular grooves, which form a cross-sectional widening 50 and provide for a uniform distribution of the exiting from the annular nozzle 32 lubricant over the circumference.
  • an external, not shown, control device is controlled so that only in the suction stroke lubricant is injected into the delivery cylinder.
  • the lubricant passes there in the separation area between the thick material and delivery cylinder inner surface, so that the degree of filling is improved due to the reduced sliding friction.
  • an improvement of the degree of filling of at least 25% can be achieved with the inventive measures in solids-rich sewage sludge.
  • the lubricant with the thick material passes into the pressure line and also there reduces the sliding friction and thus the delivery pressure required for material transport.
  • the lubricant injection is interrupted in each case. This is the danger of a Leersaugens avoided the Gleitmiteltechnisch by passing thick matter.
  • the invention relates to a piston pump for thick materials, in particular for solids-rich sewage sludge, coal sludge and concrete.
  • the piston pump has at least one delivery cylinder 16 containing a motor-driven or hydraulically driven delivery piston 20, which has an orifice opening 12 which, in accordance with the movement of the delivery piston 20, alternately communicates with the interior of a material feed container 10 and with a pressure delivery line 30.
  • an annular nozzle 32 which opens into the delivery cylinder 16 in the region of the discharge opening 12 is provided, which is connected to an external pressure line 34 that can be acted upon by a lubricant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention relates to a piston pump for thick matter, in particular for high-solids sewage sludge, coal sludge and concrete. The piston pump has at least one delivery cylinder (16) which contains a motor-driven or hydraulically driven delivery piston (20) and which has an orifice (12) which communicates alternately with the interior of a material feed container (10) and with a pressure delivery line (30) in a slide-controlled manner in accordance with the movement of the delivery piston (20). In order to significantly increase the degree of filling of the at least one delivery cylinder (16), an annular nozzle (32) opening into the delivery cylinder (16) in the region of the orifice (12) is provided, and this annular nozzle (32) is connected to an external pressure line (34) to which a lubricant can be admitted.

Description

Die Erfindung betrifft eine
Kolbenpumpe für Dickstoffe mit mindestens einem einen motorisch oder hydraulisch angetriebenen Förderkolben enthaltenden Förderzylinder, der eine Mündungsöffnung aufweist, die nach Maßgabe der Bewegung des Förderkolbens schiebergesteuert abwechselnd mit dem Inneren eines Materialaufgabebehälters und mit einer Druckförderleitung kommuniziert.The invention relates to a
Piston pump for thick materials with at least one motorized or hydraulically driven delivery piston containing delivery cylinder having a mouth opening, which communicates in accordance with the movement of the delivery piston slide-controlled alternately with the interior of a material feed container and with a pressure conveying line.

Kolbenpumpen dieser Art werden zur Förderung von Feststoff-FlüssigGemischen mit hohem Feststoffanteil, wie z.B. Klärschlamm, Kohlenschlamm, Biomasse oder Beton eingesetzt. Derartige Dickstoffe weisen eine große innere Reibung auf, so dass der Füllgrad der Förderzylinder beim Saugvorgang häufig zu wünschen übrig lässt. Andererseits ist es bei Kolbenpumpen dieser Art bekannt ( EP-B-633863 ), bei der Förderung von Dickstoffen zur Verminderung der Wandreibung am Eingang der Druckförderleitung ein Gleitmittel zwischen den Dickstoffstrang und die Wand der Druckförderleitung einzubringen. Dies erfolgt meist kontinuierlich und proportional zum Förderstrom in dosierter Menge, mit dem Erfolg, dass sich zwischen der Rohrinnenwand und dem Dickstoffstrang eine Grenzschicht bildet, durch die sich der Förderdruck reduzieren lässt. Da die Gleitschicht entlang der Förderstrecke allmählich verschwindet, muss in gewissen Abständen zusätzliches Gleitmittel in Druckförderleitung injiziert werden. Um den Füllgrad des Förderzylinders zu erhöhen, ist im Bereich des Materialaufgabebehälters üblicherweise eine Vorpresseinrichtung vorgesehen, mit der der Fülldruck um mindestens 1 bar erhöht werden kann. In vielen Fällen ist dies jedoch nicht ausreichend.Piston pumps of this type are used for conveying solid-liquid mixtures with a high solids content, such as sewage sludge, coal sludge, biomass or concrete. Such thick materials have a high internal friction, so that the degree of filling of the delivery cylinder often leaves something to be desired during the suction process. On the other hand, it is known in piston pumps of this type ( EP-B-633 863 ), in the promotion of thick materials to reduce the wall friction at the entrance of the pressure conveying line to introduce a lubricant between the slurry strand and the wall of the pressure conveying line. This is usually done continuously and proportionally to the flow in metered quantity, with the result that forms an interface between the pipe inner wall and the thick matter strand through which the delivery pressure can be reduced. Since the sliding layer gradually disappears along the conveying path, additional lubricant must be injected into the pressure conveying line at certain intervals. In order to increase the degree of filling of the delivery cylinder, a pre-pressing device is usually provided in the region of the material supply container, with which the filling pressure can be increased by at least 1 bar. In many cases, however, this is not enough.

DE 12 85 319 beschreibt den nächsten Stand der Technik. DE 12 85 319 describes the closest prior art.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, die bekannte Kolbenpumpe für Dickstoffe dahingehend zu verbessern, dass auch bei hohen Feststoffanteilen im Dickstoffmaterial der Füllgrad im Förderzylinder signifikant erhöht werden kann.Proceeding from this, the present invention seeks to improve the known piston pump for thick materials in that even at high Solid contents in the thick material of the degree of filling in the delivery cylinder can be significantly increased.

Zur Lösung dieser Aufgabe wird die im Patentanspruch 1 angegebene Merkmalskombination vorgeschlagen. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.To solve this problem, the feature combination specified in claim 1 is proposed. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

Der erfindungsgemäßen Lösung liegt vor allem der Gedanke zugrunde, dass im Bereich der Mündungsöffnung eine in den Förderzylinder mündende Ringdüse angeordnet ist, die an eine externe Druckleitung angeschlossen ist, wobei die Druckleitung über eine Hochdruckpumpe mit einem Gleitmittel beaufschlagt werden kann. Vorteilhafterweise ist die Druckleitung über eine im Mündungsbereich des Förderzylinders angeordnete Bohrung an einen in die Ringdüse mündenden Ringkanal angeschlossen.Above all, the solution according to the invention is based on the idea that in the region of the orifice, an annular nozzle opening into the delivery cylinder is arranged, which is connected to an external pressure line, wherein the pressure line can be acted upon by a high-pressure pump with a lubricant. Advantageously, the pressure line is connected via a arranged in the mouth region of the delivery cylinder bore to an opening into the annular nozzle annular channel.

Eine bevorzugte konstruktive Ausgestaltung der Erfindung sieht vor, dass der Förderzylinder einen Außenring trägt, der mindestens eine mit einem zur Ringdüse führenden Ringkanal außenseitig an die Druckleitung angeschlossene Bohrung aufweist, wobei der Ringkanal innenseitig durch eine Außenfläche des Förderzylinders oder eines an diesen axial anschließenden Innenrings und außenseitig durch eine Innenfläche des Außenrings begrenzt ist. Zweckmäßig greift der genannte Innenring in eine nach innen offene Ausnehmung des Außenrings ein und begrenzt zusammen mit diesem den Ringkanal und die Ringdüse. Der Innenring ist dabei vorteilhafterweise mit einem rückwärtigen, radial überstehenden Bund zwischen zwei einander zugewandten Ringflächen des Förderzylinders und des äußeren Ringkörpers eingespannt.A preferred structural embodiment of the invention provides that the delivery cylinder carries an outer ring having at least one leading to the annular nozzle ring channel outside the pressure line connected to the bore, wherein the annular channel on the inside by an outer surface of the delivery cylinder or an axially adjacent to this inner ring and is bounded on the outside by an inner surface of the outer ring. Suitably, said inner ring engages in an inwardly open recess of the outer ring and limits together with this the annular channel and the annular nozzle. The inner ring is advantageously clamped with a rear, radially projecting collar between two mutually facing annular surfaces of the delivery cylinder and the outer ring body.

Um eine gleichmäßige Verteilung der Dickstoffe über den Umfang zu gewährleisten, weist der Ringkanal zweckmäßig mindestens eine ringförmige Querschnittserweiterung vor. Vorteilhafterweise sind zwei im Abstand voneinander angeordnete ringförmige Querschnittserweiterungen vorgesehen.In order to ensure a uniform distribution of the thick matter over the circumference, the annular channel expediently has at least one annular Cross-sectional expansion before. Advantageously, two spaced apart annular cross-sectional extensions are provided.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist eine auf die Position und/oder die Hubrichtung des Förderkolbens im Förderzylinder ansprechende Steuereinrichtung und ein in der Druckleitung angeordnetes, auf ein Ausgangssignal der Steuereinrichtung ansprechendes Steuerventil vorgesehen, das beim Saughub des Förderkolbens öffnet und vor dessen Druckhub schließt. Das Steuerventil ist dabei zweckmäßig als über den Förderkolben vorzugsweise magnetisch ansteuerbares Wegeventil ausgebildet.According to a preferred embodiment of the invention, responsive to the position and / or the stroke direction of the delivery piston in the delivery cylinder control means and arranged in the pressure line, responsive to an output of the control means control valve is provided which opens during the suction stroke of the delivery piston and closes before the pressure stroke. The control valve is expediently formed as preferably via the delivery piston magnetically controllable directional control valve.

Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass zwei in ihrem Mündungsbereich jeweils eine Ringdüse aufweisende Förderzylinder vorgesehen sind, deren Ringdüsen bei jedem Saughub der im Gegentakt angesteuerten Förderkolben über das Steuerventil mit Gleitmittel beaufschlagbar sind.A preferred embodiment of the invention provides that two in each case an annular nozzle having delivery cylinder are provided in its mouth region, the annular nozzles are acted upon by the control valve with lubricant during each suction stroke of the push-pull controlled delivery piston.

Die Erfindung bezieht sich außerdem auf ein Verfahren zum Betrieb einer Kolbenpumpe für Dickstoffe, bei welchem abwechselnd in einem Saughub Dickstoffmaterial in einen einseitig offenen Förderzylinder eingesaugt und bei einem anschließenden Druckhub aus dem Förderzylinder in eine Druckförderleitung gepresst wird. Um den Füllgrad des Förderzylinders signifikant zu erhöhen, wird gemäß der Erfindung vorgeschlagen, dass bei jedem Saughub ein Gleitmittel in den Förderzylinder injiziert wird. Das Gleitmittel wird dabei vorteilhafterweise in den Trennbereich zwischen Dickstoffmaterial und Förderzylinderinnenfläche injiziert, und zwar über deren gesamten Umfang. Um eine ungewollte Entleerung der Zuleitungen für das Gleitmittel zu vermeiden, wird die Gleitmittelinjektion während des Druckhubs zweckmäßig unterbrochen. Das Gleitmittel wird mit einem Überdruck gegenüber dem im Förderzylinder angeordneten Dickstoff injiziert. Der Injektionsdruck beträgt zweckmäßig mehr als 50, vorzugsweise etwa 100 bar, während der Vorpressdruck im Dickstoffmaterial beim Saughub zweckmäßig bei ca. 2 bar liegt.The invention also relates to a method for operating a piston pump for thick materials, in which in a suction stroke thick matter material is sucked into a delivery cylinder open on one side and pressed in a subsequent pressure stroke from the delivery cylinder in a pressure conveying line. In order to increase the degree of filling of the delivery cylinder significantly, it is proposed according to the invention that a lubricant be injected into the delivery cylinder with each suction stroke. The lubricant is advantageously injected into the separation area between the thick material and delivery cylinder inner surface, over its entire circumference. In order to avoid unwanted emptying of the supply lines for the lubricant, the lubricant injection is interrupted during the pressure stroke appropriate. The lubricant is injected with an overpressure relative to the thick stock arranged in the delivery cylinder. The injection pressure is expediently more than 50, preferably about 100 bar, during the prepressing pressure in the thick material at the suction stroke is appropriate at about 2 bar.

Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass im Falle einer Zweizylinder-Kolbenpumpe die Kolben in einem ersten und einem zweiten Förderzylinder im Gegentakt unter Ausführung eines Saughubs und eines Druckhubs angesteuert werden, wobei in die Förderzylinder bei jedem Saughub ein Gleitmittel injiziert wird und die Gleitmittelinjektion während des jeweiligen Druckhubs unterbrochen wird.A preferred embodiment of the invention provides that in the case of a two-cylinder piston pump, the piston in a first and a second delivery cylinder are driven in push-pull execution of a suction stroke and a pressure stroke, wherein in the delivery cylinder at each suction stroke, a lubricant is injected and the lubricant injection is interrupted during the respective printing stroke.

Mit den erfindungsgemäßen Maßnahmen wird vor allem bei Dickstoffen mit hohem Feststoffanteil eine wesentliche Verbesserung des Füllgrads im Förderzylinder erzielt. Außerdem wird die sich im Förderzylinder bildende Gleitmittelschicht in die Druckförderleitung mitgenommen, so dass in einem ersten, an die Dickstoffpumpe anschließenden Leitungsabschnitt eine zusätzliche Gleitmittelinjektion entbehrlich wird. Erst bei langen Druckförderleitungen mit mehr als 50 bis 100 m Länge kann im Abstand von der Dickstoffpumpe zusätzliches Gleitmittel in die Druckförderleitung injiziert werden. Während das Gleitmittel in den Förderzylinder nur beim Saughub injiziert wird, sollte die Gleitmittelinjektion in die Druckförderleitung kontinuierlich erfolgen.With the measures according to the invention, a substantial improvement in the degree of filling in the delivery cylinder is achieved, especially in the case of thick products with a high solids content. In addition, the lubricant layer forming in the delivery cylinder is taken into the pressure feed line, so that in a first line section adjoining the thick matter pump an additional lubricant injection is dispensed with. Only with long pressure conveying lines with more than 50 to 100 m in length can be injected at a distance from the sludge pump additional lubricant in the pressure conveying line. While the lubricant is injected into the delivery cylinder only during the suction stroke, the lubricant injection into the delivery conduit should be continuous.

Im Folgenden wird die Erfindung anhang eines in der Zeichnung in schematischer Weise dargestellten Ausführungsbeispiels näher erläutert. Es zeigen

Fig. 1
eine Draufsicht auf eine Zweizylinder-Kolbenpumpe für Dickstoffe für den Anschluss an eine Förderleitung;
Fig. 2a
und b eine Draufsicht und eine Schnittdarstellung der Zweizylin- der-Kolbenpumpe nach Fig. 1 in vergrößerten Darstellung ohne Materialaufgabebehälter;
Fig. 3
einen vergrößerten Ausschnitt aus der Schnittdarstellung nach Fig. 2b;
Fig. 4
einen Schnitt durch den Mündungsbereich eines der Förderzylin- der in gegenüber Fig. 3 vergrößerter Darstellung.
In the following the invention will be explained in more detail an embodiment of an embodiment schematically illustrated in the drawing. Show it
Fig. 1
a plan view of a two-cylinder piston pump for thick materials for connection to a delivery line;
Fig. 2a
and FIG. 2 b shows a top view and a sectional view of the two-cylinder piston pump. FIG Fig. 1 in an enlarged view without material supply container;
Fig. 3
an enlarged section of the sectional view Fig. 2b ;
Fig. 4
a section through the mouth of one of the Förderzylin- in opposite Fig. 3 enlarged view.

Die in Fig. 1 schematisch dargestellte Zweizylinder-Dickstoffpumpe ist zur Förderung von feststoffreichen Dickstoffen, wie z.B. von teilentwässertem Klärschlamm, von Kohlenstaubschlamm oder von Beton bestimmt.In the Fig. 1 schematically illustrated two-cylinder slurry pump is intended to promote solids-rich thick matter, such as partially dewatered sewage sludge, coal dust sludge or concrete.

Die Kolbenpumpe besteht im wesentlichen aus einem Materialaufgabebehälter 10, zwei mit ihren stirnseitigen Mündungsöffnungen 12 über Wandungsöffnungen 14 an den Materialaufgabebehälter 10 angeschlossenen Förderzylindern 16, zwei in den Förderzylindern 16 im Gegentakt über hydraulische Antriebszylinder 18 antreibbaren Förderkolben 20 und einem zwischen den Antriebszylindern 18 und den Förderzylindern 16 angeordneten Wasserkasten 22. Innerhalb des Materialaufgabebehälters 10 ist ein Rohrschieber 21 angeordnet, der mit seiner Eintrittsöffnung 26 abwechselnd an die Mündungsöffnung 12 des Förderzylinders, dessen Kolben einen Druckhub ausführt, anschließbar ist und die Mündungsöffnung 12 des anderen Förderzylinders, dessen Kolben einen Saughub ausführt, freilässt, und dessen Austrittsöffnung 28 über einen am Materialaufgabebehälter 10 angeordneten Druckstutzen 30 an eine nicht dargestellte Druckförderleitung angeschlossen ist. Bei dem in Fig. 1 gezeigten Ausführungsbeispiel weist der Rohrschieber 24 ein innerhalb des Materialaufgabebehälters 10 verschwenkbares, S-förmig gekrümmtes Schwenkrohr auf. Dementsprechend gelangt bei jedem Saughub Dickstoffmaterial aus dem Inneren des Materialaufgabebehälters 10 gegebenenfalls unter Ausübung eines Vorpressdrucks über die offene Mündungsöffnung 12 in den betreffenden Förderzylinder 16, während im anderen Förderzylinder 16 das dort befindliche Dickstoffmaterial durch den Förderkolben 20 unter Ausführung eines Druckhubs über das Schwenkrohr des Rohrschiebers 24 und den Druckstutzen 30 in das anschließende Druckförderrohr gepresst wird.The piston pump consists essentially of a material feed container 10, two with their frontal orifices 12 via wall openings 14 connected to the material feed container 10 feed cylinders 16, two in the feed cylinders 16 in push-pull via hydraulic drive cylinder 18 drivable delivery piston 20 and one between the drive cylinders 18 and the delivery cylinders Within the material feed container 10, a pipe slide 21 is arranged, which is connected with its inlet opening 26 alternately to the mouth opening 12 of the delivery cylinder whose piston performs a pressure stroke, and the mouth opening 12 of the other delivery cylinder whose piston performs a suction stroke, leaves free, and the outlet opening 28 is connected via a arranged on the material supply container 10 discharge nozzle 30 to a pressure conveying line, not shown. At the in Fig. 1 shown embodiment, the pipe slide 24 has a pivotable within the material feed container 10, S-shaped curved pivot tube. Accordingly, at each suction stroke high-viscosity material from the interior of the material feed container 10 optionally under the exercise of a pre-pressure on the open mouth opening 12 in the respective delivery cylinder 16, while in the other delivery cylinder 16, there located thick material through the delivery piston 20 under execution of a pressure stroke on the pivot tube the pipe slide 24 and the discharge nozzle 30 is pressed into the subsequent pressure conveying pipe.

Eine Besonderheit der Erfindung besteht darin, dass im Bereich der Mündungsöffnung 12 eine Ringdüse 32 angeordnet ist, die über Druckrohre 34 Bohrungen 36 und einen Ringkanal 38 mit einem Gleitmittel unter einem Druck von ca. 50 bis 100 bar beaufschlagbar ist. Zur Bildung des Ringkanals 38 und der Ringdüse 30 schließt sich an den Förderzylinder 16 im Bereich der Mündungsöffnung 12 ein Innenrohr 40 axial an, das von einem auf den Förderzylinder 16 aufgeschraubten Außenrohr 42 übergriffen wird. Zu diesem Zweck weist das Innenring 40 einen radial überstehenden Bund 44 auf, der zwischen einer Ringfläche 46 des Außenrohrs 42 und der stirnseitigen Ringfläche 48 des Förderzylinders 16 so eingespannt ist, dass die Ringdüse 32 und der Ringkanal 38 zwischen Innenrohr und Außenrohr offen bleibt. Die Bohrungen 36 für die Gleitmittelzufuhr sind im Außenrohr 42 angeordnet. Das Innenrohr 40 weist an seiner den Ringkanal 38 begrenzenden Innenfläche zwei Ringnuten auf, die eine Querschnittserweiterung 50 bilden und für eine gleichmäßige Verteilung des aus der Ringdüse 32 austretenden Gleitmittels über den Umfang sorgen.A special feature of the invention is that in the region of the mouth opening 12, an annular nozzle 32 is arranged, which can be acted upon by pressure pipes 34 holes 36 and an annular channel 38 with a lubricant under a pressure of about 50 to 100 bar. To form the annular channel 38 and the annular nozzle 30, an inner tube 40, which is overlapped by an outer tube 42 screwed onto the delivery cylinder 16, adjoins the delivery cylinder 16 in the region of the orifice opening 12 axially. For this purpose, the inner ring 40 on a radially projecting collar 44 which is clamped between an annular surface 46 of the outer tube 42 and the end face annular surface 48 of the conveyor cylinder 16 so that the annular nozzle 32 and the annular channel 38 between the inner tube and outer tube remains open. The holes 36 for the lubricant supply are arranged in the outer tube 42. The inner tube 40 has on its annular surface 38 bounding the inner surface of two annular grooves, which form a cross-sectional widening 50 and provide for a uniform distribution of the exiting from the annular nozzle 32 lubricant over the circumference.

Für die Gleitmittelzufuhr zu den einzelnen Förderzylindern 16 wird eine externe, nicht dargestellte Steuerungsvorrichtung so gesteuert, dass nur beim Saughub Gleitmittel in den Förderzylinder injiziert wird. Das Gleitmittel gelangt dort in den Trennbereich zwischen Dickstoffmaterial und Förderzylinderinnenfläche, so dass der Füllgrad aufgrund der herabgesetzten Gleitreibung verbessert wird. Versuche haben gezeigt, dass mit den erfindungsgemäßen Maßnahmen bei feststoffreichen Klärschlämmen eine Verbesserung des Füllgrads von mindestens 25 % erzielt werden kann. Beim anschließenden Druckhub gelangt das Gleitmittel mit dem Dickstoffmaterial in die Druckleitung und setzt auch dort die Gleitreibung und damit den für den Materialtransport erforderlichen Förderdruck herab. Während des Druckhubs wird die Gleitmittelinjektion jeweils unterbrochen. Damit wird die Gefahr eines Leersaugens der Gleitmittelleitung durch das vorbeiströmende Dickstoffmaterial vermieden.For the supply of lubricant to the individual delivery cylinders 16, an external, not shown, control device is controlled so that only in the suction stroke lubricant is injected into the delivery cylinder. The lubricant passes there in the separation area between the thick material and delivery cylinder inner surface, so that the degree of filling is improved due to the reduced sliding friction. Experiments have shown that an improvement of the degree of filling of at least 25% can be achieved with the inventive measures in solids-rich sewage sludge. During the subsequent pressure stroke, the lubricant with the thick material passes into the pressure line and also there reduces the sliding friction and thus the delivery pressure required for material transport. During the pressure stroke, the lubricant injection is interrupted in each case. This is the danger of a Leersaugens avoided the Gleitmitelleitung by passing thick matter.

Zusammenfassend ist folgendes festzuhalten: Die Erfindung bezieht sich auf eine Kolbenpumpe für Dickstoffe, insbesondere für feststoffreiche Klärschlämme, Kohlenschlämme und Beton. Die Kolbenpumpe weist mindestens einen einen motorisch oder hydraulisch angetriebenen Förderkolben 20 enthaltenden Förderzylinder 16 auf, der eine Mündungsöffnung 12 aufweist, die nach Maßgabe der Bewegung des Förderkolbens 20 schiebergesteuert abwechselnd mit dem Inneren eines Materialaufgabebehälters 10 und mit einer Druckförderleitung 30 kommuniziert. Um den Füllgrad des mindestens einen Förderzylinders 16 signifikant zu erhöhen, ist eine im Bereich der Mündungsöffnung 12 in den Förderzylinder 16 mündende Ringdüse 32 vorgesehen, die an eine mit einem Gleitmittel beaufschlagbare externe Druckleitung 34 angeschlossen ist.In summary, the following should be noted: The invention relates to a piston pump for thick materials, in particular for solids-rich sewage sludge, coal sludge and concrete. The piston pump has at least one delivery cylinder 16 containing a motor-driven or hydraulically driven delivery piston 20, which has an orifice opening 12 which, in accordance with the movement of the delivery piston 20, alternately communicates with the interior of a material feed container 10 and with a pressure delivery line 30. In order to significantly increase the degree of filling of the at least one delivery cylinder 16, an annular nozzle 32 which opens into the delivery cylinder 16 in the region of the discharge opening 12 is provided, which is connected to an external pressure line 34 that can be acted upon by a lubricant.

Claims (12)

  1. Piston pump for thick substances, having at least one feed cylinder (16) containing a motor-driven or hydraulically driven feed piston (20), which cylinder has an orifice opening (12) that alternately communicates with the interior of a material application container (10) and with a pressure feed line (pressure connector 30), as determined by the movement of the feed piston (20), controlled by a slide, characterized in that a ring nozzle (32) that opens into the feed cylinder (16) is disposed in the region of the orifice opening (12), which nozzle is connected with at least one external pressure line (34), that the pressure line (34) can have a lubricant applied to it by way of a high-pressure pump, and is connected with a ring channel (38) that opens into the ring nozzle (32), and that the feed cylinder (16) carries an outer ring body (42), which has at least one bore (36) connected with the pressure line (34) on the outside, having a ring channel (38) that leads to the ring nozzle (32).
  2. Piston pump according to claim 1, characterized in that the ring channel (38) is delimited on the inside by an outer surface of the feed cylinder, or of an inner pipe (40) that follows it axially, and on the outside by an inner surface of the outer ring body (42).
  3. Piston pump according to one of claims 1 or 2, characterized in that an inner pipe (40) follows the feed cylinder (16), on the face side, which pipe engages into a recess of the outer ring body (42) that is open towards the inside, and delimits the ring channel (38) and the ring nozzle (32) together with this ring body.
  4. Piston pump according to one of claims 1 to 3, characterized in that the ring channel (38) has at least one ring-shaped cross-section widening (50).
  5. Piston pump according to claim 4, characterized in that the ring channel (38) has two ring-shaped cross-section widenings (50), spaced at a distance from one another.
  6. Piston pump according to one of claims 1 to 5, characterized by a control device that responds to the position and/or the stroke direction of the feed piston (20) in the feed cylinder (16), and a control valve that responds to an output signal of the control device and is disposed in the pressure line (34).
  7. Piston pump according to claim 6, characterized in that the control valve disposed in the pressure line (34) opens during the suction stroke of the feed piston (20) and closes before its pressure stroke.
  8. Piston pump according to claim 6 or 7, characterized in that the control valve is configured as a directional valve that can be controlled by way of the feed piston (20), preferably magnetically.
  9. Piston pump according to one of claims 1 to 8, characterized in that two feed cylinders (16), which each have a ring nozzle (32) in their orifice region (12), are provided, whose ring nozzles (32) can have lubricant applied to them, by way of the control valve, during every suction stroke of the feed piston (20), which can be controlled in opposite cycles.
  10. Piston pump according to one of claims 1 to 9, characterized in that the inner pipe (40) is braced between two ring surfaces (46, 48) of the feed cylinder (16) and of the outer ring body (42) that face one another, with a rear, radially projecting collar (44).
  11. Method for operation of a piston pump for thick substances, in which thick-substance material is alternately drawn into a feed cylinder (16) that is open on one side, during a suction stroke, and pressed out of the feed cylinder into a pressure feed line during a subsequent pressure stroke, characterized in that lubricant is injected into the feed cylinder (16) during every suction stroke, whereby the lubricant is injected over the entire circumference of the feed cylinder inner surface into the separation region between thick-substance material and feed cylinder inner surface.
  12. Method according to claim 11, characterized in that the lubricant injection is interrupted during the pressure stroke.
EP07723523A 2006-04-04 2007-03-23 Piston pump for thick matter Not-in-force EP2002121B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006016083A DE102006016083A1 (en) 2006-04-04 2006-04-04 Piston pump for thick materials
PCT/EP2007/002572 WO2007115665A1 (en) 2006-04-04 2007-03-23 Piston pump for thick matter

Publications (2)

Publication Number Publication Date
EP2002121A1 EP2002121A1 (en) 2008-12-17
EP2002121B1 true EP2002121B1 (en) 2010-10-13

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Application Number Title Priority Date Filing Date
EP07723523A Not-in-force EP2002121B1 (en) 2006-04-04 2007-03-23 Piston pump for thick matter

Country Status (8)

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US (1) US20100232996A1 (en)
EP (1) EP2002121B1 (en)
JP (1) JP5202512B2 (en)
CN (1) CN101410619A (en)
AT (1) ATE484676T1 (en)
CA (1) CA2647794A1 (en)
DE (2) DE102006016083A1 (en)
WO (1) WO2007115665A1 (en)

Cited By (3)

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FR3105252A1 (en) 2019-12-23 2021-06-25 Syctom L'agence Metropolitaine Des Dechets Menagers High pressure injection device of an organic resource
FR3105207A1 (en) 2019-12-23 2021-06-25 Syctom L'agence Metropolitaine Des Dechets Menagers High pressure injection device of a wet mixture
FR3112089A1 (en) 2020-07-02 2022-01-07 Commissariat A L'energie Atomique Et Aux Energies Alternatives HIGH PRESSURE EFFLUENT INJECTION DEVICE

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FR3105252A1 (en) 2019-12-23 2021-06-25 Syctom L'agence Metropolitaine Des Dechets Menagers High pressure injection device of an organic resource
FR3105207A1 (en) 2019-12-23 2021-06-25 Syctom L'agence Metropolitaine Des Dechets Menagers High pressure injection device of a wet mixture
WO2021130445A1 (en) 2019-12-23 2021-07-01 Syctom L'agence Metropolitaine Des Dechets Menagers Device for the high-pressure injection of an organic resource
WO2021130444A1 (en) 2019-12-23 2021-07-01 Syctom L'agence Metropolitaine Des Dechets Menagers Device for high-pressure injection of a wet mixture
FR3112089A1 (en) 2020-07-02 2022-01-07 Commissariat A L'energie Atomique Et Aux Energies Alternatives HIGH PRESSURE EFFLUENT INJECTION DEVICE

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DE502007005346D1 (en) 2010-11-25
JP2009532616A (en) 2009-09-10
DE102006016083A1 (en) 2007-10-11
CA2647794A1 (en) 2007-10-18
WO2007115665A1 (en) 2007-10-18
EP2002121A1 (en) 2008-12-17
JP5202512B2 (en) 2013-06-05
CN101410619A (en) 2009-04-15
ATE484676T1 (en) 2010-10-15
US20100232996A1 (en) 2010-09-16

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