EP2852762B1 - Rotary piston pump with optimised inlet and outlet - Google Patents

Rotary piston pump with optimised inlet and outlet Download PDF

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Publication number
EP2852762B1
EP2852762B1 EP13726670.6A EP13726670A EP2852762B1 EP 2852762 B1 EP2852762 B1 EP 2852762B1 EP 13726670 A EP13726670 A EP 13726670A EP 2852762 B1 EP2852762 B1 EP 2852762B1
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EP
European Patent Office
Prior art keywords
pump
recesses
rotary piston
outlet
inlet
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.)
Active
Application number
EP13726670.6A
Other languages
German (de)
French (fr)
Other versions
EP2852762A1 (en
Inventor
Stefan Weigl
Reinhard Denk
Hisham Kamal
Josef Strassl
Robert Kurz
Bernhard Murrenhoff
Thomas Boehme
Gunther Herr
Franz Kneidl
Mikael Tekneyan
Matthias Gradl
Erwin Weber
Roger Willis
Stefan Kern
Johann Kreidl
Marcel Verhoeven
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.)
Netzsch Pumpen and Systeme GmbH
Original Assignee
Netzsch Pumpen and Systeme GmbH
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Publication of EP2852762A1 publication Critical patent/EP2852762A1/en
Application granted granted Critical
Publication of EP2852762B1 publication Critical patent/EP2852762B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—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
    • F04C2/14—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 toothed rotary pistons
    • F04C2/18—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 toothed rotary pistons with similar tooth forms
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086—Carter
    • 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
    • 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

Definitions

  • the present invention relates to a rotary pump for the delivery of liquids and for the promotion of solids-containing liquids.
  • the rotary lobe pump consists of a pump housing, which is provided with an inlet and an outlet.
  • the pump housing has a lining.
  • In the pump housing, or within the lining at least two oppositely rotating rotary pistons are arranged, which form pump chambers during their rotation. During the rotary movement, the rotary pistons are sealed against each other, against the pump housing and against the lining.
  • German patent application DE 10 2006 041 633 A1 discloses a pump with a housing formed from two intersecting cylinder sections, wherein inlet and outlet openings are provided on opposite sides and in each cylinder section, a rotor rotatable about the central longitudinal axis thereof is arranged.
  • the larger transverse axes of the rotor are in each case at least one movement phase approximately perpendicular to each other with the runners sealingly rolling against each other and against the housing inner wall, and extending from the intersection of the large transverse axes generatrix lines run each runner in opposite directions obliquely to the respective central longitudinal axis.
  • Each runner comprises two approximately club-shaped sections, which are connected at their narrower end via a constriction.
  • the two runners When the large transverse axes of the two runners are perpendicular to each other engages the club-shaped portion of a runner in the constriction of the other runner and the two runners roll sealingly from each other.
  • the two runners In each phase of the rotational movement, the two runners form a uniformly increasing suction volume in front of the inlet opening and a uniformly decreasing outlet volume in front of the outlet opening.
  • the surface lines acting as sealing lines are sinusoidal.
  • German utility model DE 20 2009 012 158 U1 discloses a rotary lobe pump for conveying a fluid medium containing solids.
  • the pump is provided with two rotary lobes with intermeshing lobe vanes and each having a rotation axis and an outer circumference, the axes of rotation of the two lobes being spaced apart from each other and parallel to each other and partially overlapping the outer peripheries of the two lobes, and a housing having an inlet opening and an outlet opening and an inner and an outer wall, wherein the inner wall of the housing in each case encloses a portion of the outer peripheries of the rotary piston and wherein the rotary piston pump is adapted to convey the medium in a conveying direction from the inlet to the outlet opening.
  • the German utility model DE 20 2006 020 113 U1 discloses a rotary lobe pump for conveying solids containing liquids.
  • the utility model is based on the task of pumping liquids containing solids in such a way that damage in the pump, in particular to the rotary piston, is prevented.
  • This task is realized by at least one specially designed ramp, through which the inlet is optimized. This optimization ensures that solids are directed into the pump chamber of the rotary lobe pump at a specific location.
  • a reduction of the cavitation is achieved by the special design of the ramps in the inlet and outlet of the rotary lobe pump.
  • an increase of the so-called housing angle is absolutely necessary. In this case, however, it is sufficient that only the lower housing half-angle has an angle of> 90 °.
  • German patent DE 94 751 A shows a capsule fan in which two counter-rotating pistons are moved, with which air is compressed and fed to an outlet.
  • the fan is provided with two special single-toothed rollers, each of which cooperates with a delivery piston so that each wing of the delivery piston is sealed by the roller C, whereby the roller C rolls into the following gap and compresses the air until the Wing releases the outlet to the pressure chamber.
  • the publication DE 34 27 282 A1 describes a rotary pump for the promotion of manure or the like.
  • the inner wall of the housing with respect to the axis of the associated rotary piston is radially movable. As a result, a relatively heavy wear on the outer jacket of the rotary piston can be caught, so that the pump power is not affected.
  • the invention has for its object to provide a rotary piston pump, with a promotion is largely possible without pulsation.
  • the rotary lobe pump consists of a pump housing, which is provided with an inlet and an outlet.
  • the pump housing has a lining.
  • In the pump housing, or within the lining at least two oppositely rotating rotary pistons are arranged, which form pump chambers during their rotation. During rotation, the rotary pistons are sealed against each other and against the liner within the pump housing.
  • In the lining at least two recesses are arranged in each pump room. The recesses are arranged in spatial proximity to the inlet and / or outlet. In the region of the inlet and in the region of the outlet, the pump housing and / or the lining can have reinforcements, which lead to a reduction in cross-section.
  • each pump chamber In a particular embodiment, four recesses are arranged in each pump chamber, wherein the recesses are always arranged in pairs. In a further embodiment, there are six recesses in each pump room, the recesses then being arranged in each case as a trio. It will be apparent to those skilled in the art from the foregoing that these are not an ultimate limitation of the invention. It is possible that a plurality of recesses may be arranged in the pump chambers. It is also conceivable to arrange a different number of recesses in the two pump chambers. As the pump room, the person skilled in the art refers to the space formed by the rotation of the rotary pistons in the rotary pump. This pump chamber, or the pump chambers, are located between the rotary piston and the pump housing.
  • the pulsation of the rotary pump is avoidable. Furthermore, by opening and closing the recesses, the pressure conditions in the pump chambers as well as in the inlet and / or outlet can be changed. These changes in pressure reduce or completely eliminate the blows occurring in the inlet and / or outlet due to the pulsation.
  • the expansion at the ends of the inlet and the outlet allows an optimized flow of the pumped medium, wherein the optimized flow, in combination with the recesses, causes an additional reduction of the pulsation.
  • the combination of recesses and reinforcement is designed such that during operation of the rotary lobe pump results in an optimized flow, with energy losses in the promotion and dead spaces within the rotary lobe pump are almost completely avoidable.
  • the spacing of the recesses from the inlet and / or the outlet is two to five times the cross section of the recesses.
  • the recesses may have different cross sections. There may be a gap between the recesses.
  • the depth of the recesses is at least ten to thirty percent of the wall thickness of the lining.
  • the recesses may have different depths.
  • the recesses in the inlet and outlet area and in the multiple arrangement may have different cross-sections and depths. It will be clear to those skilled in the art that the statements made above are not an exhaustive limitation of the invention. Rather, they refer to preferred embodiments. Due to the different number and configurations of the recesses, it is possible to change the pressure curves in the pump and thus the flows and the pulsation differently or avoided.
  • Fig. 1 shows a rotary piston pump according to the invention with an open pump housing.
  • the Fig. 2 to 4 show different positions of the rotary piston with contact to the lining of the pump housing.
  • Fig. 5 shows a lining for a rotary piston pump according to the invention with twelve recesses.
  • Fig. 1 shows a rotary piston pump 10 according to the invention with an open pump housing 12.
  • the rotary piston pump 10 consists of a pump housing 12, which is provided with an inlet 14 and an outlet 16.
  • a liner 18 is introduced in the pump housing 12.
  • the lining 18 is provided with recesses 24a, 24b, 24c and 24d. Furthermore, the lining 18 has reinforcements 26 in the region of the inlet 14 and the outlet 16.
  • the rotary pistons 20a and 20b are arranged with which the conveying medium is pumped from the inlet 14 to the outlet 16.
  • the recesses 24a, 24b, 24c and 24d are all open. The position of the rotary pistons shown may flow medium into the recesses 24a and 24c and medium may flow out of the recesses 24b and 24d.
  • Fig. 2 to 4 show various positions of the rotary piston 20a and 20b with contact to the lining 18 of the pump housing (not shown).
  • Fig. 2 shows a position in which the rotary pistons 20a and 20b are arranged parallel to each other.
  • the pump chambers 22a and 22b are open.
  • the pump chamber 22a is open to the inlet 14, so that medium can flow into the rotary piston pump.
  • the pump chamber 22b is open to the outlet 16 so that the medium can flow out of the rotary pump.
  • the reinforcements 26 are provided at an angle w of 20 to 160 degrees, preferably at an angle w of 45 to 135 degrees. By this angle w, an improved inflow and outflow of the medium in and out of the rotary piston pump is made possible.
  • the reinforcements 26 By the reinforcements 26, the cross-section of the inlet 14 and the outlet 16 is reduced. Towards their ends 28, the inlet 14 and the outlet 16 widen. By this expansion, an improved supply of medium into the rotary pump and a better pumping of the medium from the rotary pump is made possible.
  • Fig. 3 shows a second position of the rotary piston 20 a and 20 b in the lining 18 of the pump housing (not shown).
  • the pump chamber 22a is closed to the inlet 14 and the outlet 16 through the rotary piston 20a.
  • the recess 24a is opened and can take up medium.
  • the recess 24b is closed by the rotary piston 20a. When closing the recess 24b with the rotary piston 20a, the medium was conveyed out of the recess 24a in the direction of the outlet 16.
  • Fig. 4 shows a third position of the rotary piston 20a and 20b with contact to the lining 18 of the pump housing (not shown).
  • the rotary piston 20a is horizontal on the vertically arranged rotary piston 20b.
  • the pump chamber 22 a is closed relative to the inlet 14 and the outlet 16.
  • the two recesses 24a and 24b are open to the pump chamber 22a.
  • medium can tile from the recess 24b into the pump space 22a.
  • the pressure in the pump chamber 22a is increased.
  • the pressure compensation flow is much lower, since the differential pressure between the pump chamber 22a and the outlet 16 has already been significantly reduced.
  • Fig. 5 shows a liner 18 for a rotary piston pump according to the invention with twelve recesses 24.
  • the twelve recesses 24 are distributed to the two pump chambers 22a and 22b.
  • the recesses 24 are arranged in four groups of three recesses 24.
  • the pulsation can also be changed by this procedure.
  • the recesses 24 are successively opened and / or closed by the rotary pistons 20a and 20b. So that the respective pressure can be changed gradually.

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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)
  • Details Of Reciprocating Pumps (AREA)
  • Rotary Pumps (AREA)

Description

Die vorliegende Erfindung betrifft eine Drehkolbenpumpe für die Förderung von Flüssigkeiten und für die Förderung von Feststoffen enthaltenden Flüssigkeiten. Die Drehkolbenpumpe besteht aus einem Pumpengehäuse, welches mit einem Einlass und einem Auslass versehen ist. Das Pumpengehäuse weist eine Auskleidung auf. In dem Pumpengehäuse, beziehungsweise innerhalb der Auskleidung sind mindestens zwei entgegengesetzt rotierende Drehkolben angeordnet, die während ihrer Drehung Pumpenräume ausbilden. Während der Drehbewegung sind die Drehkolben gegeneinander, gegen das Pumpengehäuse und gegen die Auskleidung abgedichtet.The present invention relates to a rotary pump for the delivery of liquids and for the promotion of solids-containing liquids. The rotary lobe pump consists of a pump housing, which is provided with an inlet and an outlet. The pump housing has a lining. In the pump housing, or within the lining at least two oppositely rotating rotary pistons are arranged, which form pump chambers during their rotation. During the rotary movement, the rotary pistons are sealed against each other, against the pump housing and against the lining.

Die deutsche Patentanmeldung DE 10 2006 041 633 A1 offenbart eine Pumpe mit einem aus zwei sich schneidenden Zylinderabschnitten gebildeten Gehäuse, wobei an einander gegenüberliegenden Seiten Einlass- und Auslassöffnungen vorgesehen sind und in jedem Zylinderabschnitt ein um dessen Mittellängsachse drehbarer Läufer angeordnet ist. Die größeren Querachsen der Läufer stehen in wenigstens einer Bewegungsphase jeweils etwa senkrecht zueinander wobei sich die Läufer dichtend aneinander und gegen die Gehäuseinnenwand abwälzen, und die von dem Schnittpunkt der großen Querachsen ausgehenden Mantellinien jedes Läufers in einander entgegengesetzter Richtung schräg zur jeweiligen Mittellängsachse verlaufen. Jeder Läufer umfasst zwei etwa keulenförmige Abschnitte, die an ihrem schmäleren Ende über eine Einschnürung miteinander verbunden sind. Wenn die großen Querachsen der beiden Läufer senkrecht zueinander stehen greift der keulenförmige Abschnitt des einen Läufers in die Einschnürung des anderen Läufers ein und die beiden Läufer wälzen sich dichtend aneinander ab. In jeder Phase der Drehbewegung bilden die beiden Läufer ein sich gleichmäßig vergrößerndes Ansaugvolumen vor der Einlassöffnung und ein sich gleichmäßig verkleinerndes Auslassvolumen vor der Auslassöffnung. Zur Verbesserung der Pumpleistung und Erhöhung der Standfestigkeit ist vorgesehen, dass die als Dichtlinien fungierenden Mantellinien sinusförmig ausgebildet sind.The German patent application DE 10 2006 041 633 A1 discloses a pump with a housing formed from two intersecting cylinder sections, wherein inlet and outlet openings are provided on opposite sides and in each cylinder section, a rotor rotatable about the central longitudinal axis thereof is arranged. The larger transverse axes of the rotor are in each case at least one movement phase approximately perpendicular to each other with the runners sealingly rolling against each other and against the housing inner wall, and extending from the intersection of the large transverse axes generatrix lines run each runner in opposite directions obliquely to the respective central longitudinal axis. Each runner comprises two approximately club-shaped sections, which are connected at their narrower end via a constriction. When the large transverse axes of the two runners are perpendicular to each other engages the club-shaped portion of a runner in the constriction of the other runner and the two runners roll sealingly from each other. In each phase of the rotational movement, the two runners form a uniformly increasing suction volume in front of the inlet opening and a uniformly decreasing outlet volume in front of the outlet opening. To improve the pumping capacity and increase the stability, it is provided that the surface lines acting as sealing lines are sinusoidal.

Im deutschen Gebrauchsmuster DE 20 2009 012 158 U1 ist eine Drehkolbenpumpe zur Förderung eines Feststoffe enthaltenden fluiden Mediums offenbart. Die Pumpe ist mit zwei Drehkolben mit ineinandergreifenden Drehkolbenflügeln und mit jeweils einer Drehachse und einem Außenumfang, wobei die Drehachsen der beiden Drehkolben beabstandet voneinander und parallel zueinander angeordnet sind und sich die Außenumfänge der beiden Drehkolben teilweise überschneiden, und einem Gehäuse mit einer Einlassöffnung und einer Auslassöffnung sowie einer Innen- und einer Außenwandung, wobei die Innenwandung des Gehäuses jeweils einen Abschnitt der Außenumfänge der Drehkolben umschließt und wobei die Drehkolbenpumpe ausgebildet ist, das Medium in einer Förderrichtung von der Einlass- zur Auslassöffnung zu fördern.In German utility model DE 20 2009 012 158 U1 discloses a rotary lobe pump for conveying a fluid medium containing solids. The pump is provided with two rotary lobes with intermeshing lobe vanes and each having a rotation axis and an outer circumference, the axes of rotation of the two lobes being spaced apart from each other and parallel to each other and partially overlapping the outer peripheries of the two lobes, and a housing having an inlet opening and an outlet opening and an inner and an outer wall, wherein the inner wall of the housing in each case encloses a portion of the outer peripheries of the rotary piston and wherein the rotary piston pump is adapted to convey the medium in a conveying direction from the inlet to the outlet opening.

Das deutsche Gebrauchsmuster DE 20 2006 020 113 U1 offenbart eine Drehkolbenpumpe für die Förderung von Feststoffen enthaltenen Flüssigkeiten. Dem Gebrauchsmuster liegt die Aufgabe zugrunde, Flüssigkeiten, die Feststoffe enthalten, derart zu pumpen, dass Schäden in der Pumpe, insbesondere an den Drehkolben, verhindert werden. Diese Aufgabe wird durch mindestens eine speziell ausgefertigte Rampe realisiert, durch welche der Einlass optimiert wird. Durch diese Optimierung wird sichergestellt, dass Feststoffe an einer bestimmten Stelle in die Pumpenkammer der Drehkolbenpumpe geleitet werden. Weiterhin wird durch die besondere Gestaltung der Rampen im Ein- und Auslassbereich der Drehkolbenpumpe eine Verringerung der Kavitation erzielt. Um die Verringerung der Kavitation zu erreichen, ist eine Erhöhung des sogenannten Gehäusewinkels zwingend notwendig. Hierbei ist es jedoch ausreichend, dass nur der untere Gehäusehalbwinkel einen Winkel von > 90° aufweist.The German utility model DE 20 2006 020 113 U1 discloses a rotary lobe pump for conveying solids containing liquids. The utility model is based on the task of pumping liquids containing solids in such a way that damage in the pump, in particular to the rotary piston, is prevented. This task is realized by at least one specially designed ramp, through which the inlet is optimized. This optimization ensures that solids are directed into the pump chamber of the rotary lobe pump at a specific location. Furthermore, a reduction of the cavitation is achieved by the special design of the ramps in the inlet and outlet of the rotary lobe pump. In order to achieve the reduction of cavitation, an increase of the so-called housing angle is absolutely necessary. In this case, however, it is sufficient that only the lower housing half-angle has an angle of> 90 °.

Die deutsche Patentschrift DE 94 751 A zeigt ein Kapselgebläse in welchem zwei gegenläufige Kolben bewegt werden, mit welchen Luft verdichtet und einem Auslass zugeführt wird. Das Gebläse ist mit zwei besonderen einzahnigen Walzen ausgestattet, welche je mit einem Förderkolben so zusammenarbeiten, dass jeder Flügel des Förderkolbens unter dichtem Abschluss von der Walze C durchgelassen wird, wodurch sich die Walze C in die folgende Lücke hineinwälzt und die Luft komprimiert, bis der Flügel den Austritt zum Druckraum freigibt.The German patent DE 94 751 A shows a capsule fan in which two counter-rotating pistons are moved, with which air is compressed and fed to an outlet. The fan is provided with two special single-toothed rollers, each of which cooperates with a delivery piston so that each wing of the delivery piston is sealed by the roller C, whereby the roller C rolls into the following gap and compresses the air until the Wing releases the outlet to the pressure chamber.

Die Offenlegungsschrift DE 34 27 282 A1 beschreibt eine Drehkolbenpumpe zur Förderung von Gülle oder dergleichen. Zum Ausgleich von Abnutzungen und zur Spielaufholung ist die Innenwand des Gehäuses bezüglich der Achse des zugehörigen Drehkolbens radial beweglich. Dadurch kann auch ein verhältnismäßig starker Verschleiß am Außenmantel des Drehkolbens aufgeholt werden, so dass die Pumpleistung nicht beeinträchtigt wird.The publication DE 34 27 282 A1 describes a rotary pump for the promotion of manure or the like. To compensate for wear and for game recovery the inner wall of the housing with respect to the axis of the associated rotary piston is radially movable. As a result, a relatively heavy wear on the outer jacket of the rotary piston can be caught, so that the pump power is not affected.

Der Erfindung liegt die Aufgabe zugrunde, eine Drehkolbenpumpe zu schaffen, mit der eine Förderung weitestgehend ohne Pulsation möglich ist.The invention has for its object to provide a rotary piston pump, with a promotion is largely possible without pulsation.

Diese Aufgabe wird durch eine Drehkolbenpumpe gelöst, die die Merkmale des Anspruchs 1 umfasst. Weitere vorteilhafte Ausgestaltungen sind den Merkmalen der Unteransprüche zu entnehmen.This object is achieved by a rotary piston pump comprising the features of claim 1. Further advantageous embodiments can be found in the features of the subclaims.

Es ist eine Drehkolbenpumpe für die Förderung von Flüssigkeiten und für die Förderung von Feststoffen enthaltenden Flüssigkeiten offenbart. Die Drehkolbenpumpe bestehet aus einem Pumpengehäuse, welches mit einem Einlass und einem Auslass versehen ist. Das Pumpengehäuse weist eine Auskleidung auf. In dem Pumpengehäuse, beziehungsweise innerhalb der Auskleidung sind mindestens zwei entgegengesetzt rotierende Drehkolben angeordnet, die während ihrer Drehung Pumpenräume ausbilden. Während der Drehbewegung sind die Drehkolben gegeneinander und gegen die Auskleidung innerhalb des Pumpengehäuses abgedichtet. In der Auskleidung sind, in jedem Pumpenraum, mindestens zwei Aussparungen angeordnet. Die Aussparungen sind in räumlicher Nähe zum Einlass und/oder zum Auslass angeordnet. Im Bereich des Einlasses und im Bereich des Auslasses können das Pumpengehäuse und/oder die Auskleidung Verstärkungen aufweisen, die zu einer Querschnittsreduzierung führen.It is a rotary lobe pump for the delivery of liquids and for the promotion of solids containing liquids disclosed. The rotary lobe pump consists of a pump housing, which is provided with an inlet and an outlet. The pump housing has a lining. In the pump housing, or within the lining at least two oppositely rotating rotary pistons are arranged, which form pump chambers during their rotation. During rotation, the rotary pistons are sealed against each other and against the liner within the pump housing. In the lining, at least two recesses are arranged in each pump room. The recesses are arranged in spatial proximity to the inlet and / or outlet. In the region of the inlet and in the region of the outlet, the pump housing and / or the lining can have reinforcements, which lead to a reduction in cross-section.

Bei einer besonderen Ausführungsform sind in jedem Pumpenraum vier Aussparungen angeordnet, wobei die Aussparungen immer Paarweise angeordnet sind. In einer weiteren Ausführungsform sind sechs Aussparungen in jedem Pumpenraum vorhanden, wobei die Aussparungen dann jeweils als Trio angeordnet sind. Für den Fachmann geht aus den vorgemachten Ausführungen hervor, dass diese keine abschließende Beschränkung der Erfindung darstellen. Es ist möglich, dass eine Vielzahl von Aussparungen in den Pumpenräumen angeordnet sein können. Es ist weiterhin vorstellbar, in den beiden Pumpenräumen eine verschiedene Anzahl von Aussparungen anzuordnen. Als Pumpenraum bezeichnet der Durchschnittsfachmann den Raum, der sich durch die Rotation der Drehkolben in der Drehkolbenpumpe bildet. Dieser Pumpenraum, beziehungsweise die Pumpenräume, befinden sich zwischen den Drehkolben und dem Pumpengehäuse.In a particular embodiment, four recesses are arranged in each pump chamber, wherein the recesses are always arranged in pairs. In a further embodiment, there are six recesses in each pump room, the recesses then being arranged in each case as a trio. It will be apparent to those skilled in the art from the foregoing that these are not an ultimate limitation of the invention. It is possible that a plurality of recesses may be arranged in the pump chambers. It is also conceivable to arrange a different number of recesses in the two pump chambers. As the pump room, the person skilled in the art refers to the space formed by the rotation of the rotary pistons in the rotary pump. This pump chamber, or the pump chambers, are located between the rotary piston and the pump housing.

Durch das Öffnen und Schließen der Aussparungen, durch die Drehkolben, ist die Pulsation der Drehkolbenpumpe vermeidbar. Weiterhin sind durch das Öffnen und Schließen der Aussparungen die Druckverhältnisse in den Pumpenräumen sowie im Einlass- und/oder im Auslassbereich veränderbar. Durch diese Druckveränderungen werden die, durch die Pulsation, auftretenden Schläge im Einlass und/oder im Auslass verringert oder ganz vermieden.By opening and closing the recesses, by the rotary pistons, the pulsation of the rotary pump is avoidable. Furthermore, by opening and closing the recesses, the pressure conditions in the pump chambers as well as in the inlet and / or outlet can be changed. These changes in pressure reduce or completely eliminate the blows occurring in the inlet and / or outlet due to the pulsation.

Die Aufweitung an den Enden des Einlasses und des Auslassens ermöglicht eine optimierte Strömung des Fördermediums, wobei die optimierte Strömung, in Kombination mit den Aussparungen, eine zusätzliche Verringerung der Pulsation bewirkt. Die Kombination aus Aussparungen und Verstärkung ist derart gestaltet, dass sich beim Betrieb der Drehkolbenpumpe eine optimierte Strömung ergibt, wobei Energieverluste bei der Förderung und Toträume innerhalb der Drehkolbenpumpe nahezu vollständig vermeidbar sind.The expansion at the ends of the inlet and the outlet allows an optimized flow of the pumped medium, wherein the optimized flow, in combination with the recesses, causes an additional reduction of the pulsation. The combination of recesses and reinforcement is designed such that during operation of the rotary lobe pump results in an optimized flow, with energy losses in the promotion and dead spaces within the rotary lobe pump are almost completely avoidable.

Der Abstand der Aussparungen vom Einlass und/oder vom Auslass beträgt das Zwei- bis Fünffache des Querschnitts der Aussparungen. Die Aussparungen können unterschiedliche Querschnitte aufweisen. Zwischen den Aussparungen kann ein Abstand bestehen. Die Tiefe der Aussparungen beträgt mindestens zehn bis dreißig Prozent der Wandstärke der Auskleidung. Die Aussparungen können unterschiedliche Tiefen aufweisen. Außerdem können die Aussparungen im Einlass- und Auslassbereich und in der Mehrfachanordnung unterschiedliche Querschnitte und Tiefen aufweisen. Für den Fachmann ist klar, dass die vorab gemachten Angaben keine abschließende Beschränkung der Erfindung darstellen. Vielmehr verweisen sie auf bevorzugte Ausführungsformen hin. Durch die verschiedene Anzahl und Ausgestaltungen der Aussparungen ist es möglich die Druckverläufe in der Pumpe und somit die Strömungen und die Pulsation unterschiedlich zu verändern oder zu vermeiden.The spacing of the recesses from the inlet and / or the outlet is two to five times the cross section of the recesses. The recesses may have different cross sections. There may be a gap between the recesses. The depth of the recesses is at least ten to thirty percent of the wall thickness of the lining. The recesses may have different depths. In addition, the recesses in the inlet and outlet area and in the multiple arrangement may have different cross-sections and depths. It will be clear to those skilled in the art that the statements made above are not an exhaustive limitation of the invention. Rather, they refer to preferred embodiments. Due to the different number and configurations of the recesses, it is possible to change the pressure curves in the pump and thus the flows and the pulsation differently or avoided.

Im Folgenden sollen Ausführungsbeispiele die Erfindung und ihre Vorteile anhand der beigefügten Figuren näher erläutern. Die Größenverhältnisse der einzelnen Elemente zueinander in den Figuren entsprechen nicht immer den realen Größenverhältnissen, da einige Formen vereinfacht und andere Formen zur besseren Veranschaulichung vergrößert im Verhältnis zu anderen Elementen dargestellt sind.In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions of the individual elements to one another in the figures do not always correspond to the actual size ratios, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration.

Fig. 1 zeigt einen erfindungsgemäß Drehkolbenpumpe mit geöffnetem Pumpengehäuse. Fig. 1 shows a rotary piston pump according to the invention with an open pump housing.

Die Fig. 2 bis 4 zeigen verschiedene Stellungen der Drehkolben mit Kontakt zur Auskleidung des Pumpengehäuses.The Fig. 2 to 4 show different positions of the rotary piston with contact to the lining of the pump housing.

Fig. 5 zeigt eine Auskleidung für eine erfindungsgemäße Drehkolbenpumpe mit zwölf Aussparungen. Fig. 5 shows a lining for a rotary piston pump according to the invention with twelve recesses.

Fig. 1 zeigt eine erfindungsgemäße Drehkolbenpumpe 10 mit geöffnetem Pumpengehäuse 12. Die Drehkolbenpumpe 10 besteht aus einem Pumpengehäuse 12, welches mit einem Einlass 14 und einem Auslass 16 versehen ist. In das Pumpengehäuse 12 ist eine Auskleidung 18 eingebracht. Die Auskleidung 18 ist mit Aussparungen 24a, 24b, 24c und 24d versehen. Weiterhin besitzt die Auskleidung 18 im Bereich des Einlasses 14 und des Auslasses 16 Verstärkungen 26. Im Inneren des Pumpengehäuses 12 sind die Drehkolben 20a und 20b angeordnet mit denen das Fördermedium vom Einlass 14 zum Auslass 16 gepumpt wird. Die Aussparungen 24a, 24b, 24c und 24d sind alle geöffnet. Die der gezeigten Stellung der Drehkolben kann Medium in die Aussparungen 24a und 24c hineinströmen und aus den Aussparungen 24b und 24d kann Medium hinaus strömen. Fig. 1 shows a rotary piston pump 10 according to the invention with an open pump housing 12. The rotary piston pump 10 consists of a pump housing 12, which is provided with an inlet 14 and an outlet 16. In the pump housing 12, a liner 18 is introduced. The lining 18 is provided with recesses 24a, 24b, 24c and 24d. Furthermore, the lining 18 has reinforcements 26 in the region of the inlet 14 and the outlet 16. Inside the pump housing 12, the rotary pistons 20a and 20b are arranged with which the conveying medium is pumped from the inlet 14 to the outlet 16. The recesses 24a, 24b, 24c and 24d are all open. The position of the rotary pistons shown may flow medium into the recesses 24a and 24c and medium may flow out of the recesses 24b and 24d.

Die Fig. 2 bis 4 zeigen verschiedene Stellungen der Drehkolben 20a und 20b mit Kontakt zur Auskleidung 18 des Pumpengehäuses (nicht dargestellt). Fig. 2 zeigt eine Stellung, in der die Drehkolben 20a und 20b parallel zueinander angeordnet sind. Die Pumpenräume 22a und 22b sind geöffnet. Der Pumpenraum 22a ist zum Einlass 14 hin geöffnet, so dass Medium in die Drehkolbenpumpe einströmen kann.The Fig. 2 to 4 show various positions of the rotary piston 20a and 20b with contact to the lining 18 of the pump housing (not shown). Fig. 2 shows a position in which the rotary pistons 20a and 20b are arranged parallel to each other. The pump chambers 22a and 22b are open. The pump chamber 22a is open to the inlet 14, so that medium can flow into the rotary piston pump.

Der Pumpenraum 22b ist zum Auslass 16 hin geöffnet, so das Medium aus der Drehkolbenpumpe hinaus strömen kann. Die Verstärkungen 26 sind mit einem Winkel w von 20 bis 160 Grad, vorzugsweise mit einem Winkel w von 45 bis 135 Grad versehen. Durch diesen Winkel w wird ein verbessertes Ein- und Ausströmen des Mediums in und aus der Drehkolbenpumpe ermöglicht. Durch die Verstärkungen 26 wird der Querschnitt des Einlasses 14 und des Auslasses 16 verringert. Zu ihren Enden 28 hin weiten sich der Einlass 14 und der Auslass 16 auf. Durch diese Aufweitung wird ein verbesserter Zulauf von Medium in die Drehkolbenpumpe und ein besseres Abpumpen des Mediums aus der Drehkolbenpumpe heraus ermöglicht.The pump chamber 22b is open to the outlet 16 so that the medium can flow out of the rotary pump. The reinforcements 26 are provided at an angle w of 20 to 160 degrees, preferably at an angle w of 45 to 135 degrees. By this angle w, an improved inflow and outflow of the medium in and out of the rotary piston pump is made possible. By the reinforcements 26, the cross-section of the inlet 14 and the outlet 16 is reduced. Towards their ends 28, the inlet 14 and the outlet 16 widen. By this expansion, an improved supply of medium into the rotary pump and a better pumping of the medium from the rotary pump is made possible.

Fig. 3 zeigt eine zweite Stellung der Drehkolben 20a und 20b in der Auskleidung 18 des Pumpengehäuses (nicht dargestellt). Aus Gründen der Vereinfachung wird in der Figurenbeschreibung nur auf den oberen Bereich der Drehkolbenpumpe eingegangen in dem sich der Pumpenraum 22a befindet. Für den Bereich des Pumpenraumes 22b sind die Vorgänge und Anläufe analog anzusehen und zu betrachten. Der Pumpenraum 22a ist zum Einlass 14 und zum Auslass 16 hin durch den Drehkolben 20a verschlossen. Die Aussparung 24a ist geöffnet und kann Medium aufnehmen. Die Aussparung 24b ist durch den Drehkolben 20a verschlossen. Beim Verschließen der Aussparung 24b mit dem Drehkolben 20a wurde das Medium aus der Aussparung 24a heraus in Richtung Auslass 16 gefördert. Fig. 3 shows a second position of the rotary piston 20 a and 20 b in the lining 18 of the pump housing (not shown). For reasons of simplification, only the upper region of the rotary piston pump in which the pump chamber 22a is located is described in the description of the figures. For the area of the pump chamber 22b, the processes and starts are to be considered analogously and considered. The pump chamber 22a is closed to the inlet 14 and the outlet 16 through the rotary piston 20a. The recess 24a is opened and can take up medium. The recess 24b is closed by the rotary piston 20a. When closing the recess 24b with the rotary piston 20a, the medium was conveyed out of the recess 24a in the direction of the outlet 16.

Fig. 4 zeigt eine dritte Stellung der Drehkolben 20a und 20b mit Kontakt zur Auskleidung 18 des Pumpengehäuses (nicht dargestellt). Der Drehkolben 20a steht horizontal auf dem vertikal angeordneten Drehkolben 20b. In dieser Stellung der Drehkolben 20a und 20b ist der Pumpenraum 22a gegenüber dem Einlass 14 und dem Auslass 16 verschlossen. Die beiden Aussparungen 24a und 24b sind zum Pumpenraum 22a hin geöffnet. Beim Öffnen der Aussparung 24b zum Pumpenraum 22a hin, kann Medium von der Aussparung 24b in den Pumpenraum 22a fliesen. Dadurch wird der Druck im Pumpenraum 22a erhöht. Beim anschließenden kompletten öffnen des Pumpenraums 22a hin zum Auslass 16, ist die Druckausgleichsströmung wesentlich geringer, da der Differenzdruck zwischen Pumpenraum 22a und dem Auslass 16 bereits deutlich reduziert wurde. Fig. 4 shows a third position of the rotary piston 20a and 20b with contact to the lining 18 of the pump housing (not shown). The rotary piston 20a is horizontal on the vertically arranged rotary piston 20b. In this position, the rotary piston 20 a and 20 b, the pump chamber 22 a is closed relative to the inlet 14 and the outlet 16. The two recesses 24a and 24b are open to the pump chamber 22a. When opening the recess 24b toward the pump chamber 22a, medium can tile from the recess 24b into the pump space 22a. As a result, the pressure in the pump chamber 22a is increased. During the subsequent complete opening of the pump chamber 22a to the outlet 16, the pressure compensation flow is much lower, since the differential pressure between the pump chamber 22a and the outlet 16 has already been significantly reduced.

Fig. 5 zeigt eine Auskleidung 18 für eine erfindungsgemäße Drehkolbenpumpe mit zwölf Aussparungen 24. Die zwölf Aussparungen 24 sind auf die zwei Pumpenräume 22a und 22b verteilt. Die Aussparungen 24 sind in vier Gruppen zu je drei Aussparungen 24 angeordnet. Durch die Verwendung der zusätzlichen Aussparungen 24 ist es möglich den Druck in den Pumpenräumen 22a und 22b stufenweise zur erhöhen und zu verringern. Auch die Pulsation ist durch diese Vorgehensweise noch einmal veränderbar. Die Aussparungen 24 werden durch die Drehkolben 20a und 20b nacheinander geöffnet und/oder verschlossen. So dass sich der jeweilige Druck stufenweise verändern lässt. Fig. 5 shows a liner 18 for a rotary piston pump according to the invention with twelve recesses 24. The twelve recesses 24 are distributed to the two pump chambers 22a and 22b. The recesses 24 are arranged in four groups of three recesses 24. By using the additional recesses 24, it is possible to gradually increase and decrease the pressure in the pump chambers 22a and 22b. The pulsation can also be changed by this procedure. The recesses 24 are successively opened and / or closed by the rotary pistons 20a and 20b. So that the respective pressure can be changed gradually.

Die Erfindung wurde unter Bezugnahme auf eine bevorzugte Ausführungsform beschrieben.The invention has been described with reference to a preferred embodiment.

Bezugszeichenreference numeral

1010
DrehkolbenpumpeRotary pump
1212
Pumpengehäusepump housing
1414
Einlassinlet
1616
Auslassoutlet
1818
Auskleidunglining
2020
Drehkolben (20a, 20b)Rotary piston (20a, 20b)
2222
Pumpenraum (22a, 22bPump chamber (22a, 22b
2424
Aussparung (in den Figuren 24a, 24b, 24c, 24d)Recess (in Figures 24a, 24b, 24c, 24d)
2626
Verstärkungreinforcement
2828
Endenend up
ww
Winkelangle

Claims (9)

  1. A rotary piston pump (10) consisting of a pump housing (12), which is provided with an inlet (14) and an outlet (16), the pump housing (12) having a lining (18), and at least two rotary pistons (20) rotating in opposite directions are arranged in the pump housing (12) or inside the lining (18), respectively, and form pump rooms (22) during their rotation, wherein the rotary pistons (20) are sealed against one another and against the lining (18) inside the pump housing (12), wherein, in the region of the inlet (14) and in the region of the outlet (16), the pump housing (12) and/or the lining (18) each has reinforcements (26) of the lining (18), by means of which a cross section reduction is realized and that the cross section of the inlet (14) and of the outlet (16) widens from the reinforcements (26) to the ends (28), characterized in that at least two recesses (24) are arranged in the lining (18) in each pump room (22), wherein the recesses (24) are arranged in spatial proximity to the inlet (14) and/or to the outlet (16).
  2. The rotary piston pump (10) according to claim 1, characterized in that four recesses (24) are arranged in each pump room (22), wherein the recesses (24) are always arranged in pairs.
  3. The rotary piston pump (10) according to one of claims 1 or 2, characterized in that the pressure ratios in the pump rooms (22) in the region of the inlet (14) and/or in the region of the outlet (16) can be changed and the pulsation of the rotary piston pump (10) can thus be avoided by means of the rotary pistons (20) by opening and closing the recesses (24).
  4. The rotary piston pump (10) according to claim 3, characterized in that an improved inflow of medium into the rotary piston pump (10) and an improved drainage of the medium out of the rotary piston pump (10) is possible by the widening of the cross sections of the inlet (14) and of the outlet (16) from the reinforcements (26) towards the ends (28), whereby the flow of the conveying medium through the rotary piston pump (10) is optimized and wherein the optimized flow of the conveying medium, in combination with the recesses (24), effects an additional reduction of the pulsation.
  5. The rotary piston pump (10) according to one of claims 1 to 4, characterized in that the distance of the recesses (24) from the inlet (14) or from the outlet (16) is two- to five-times the cross section of the recesses (24).
  6. The rotary piston pump (10) according to one of claims 1 to 5, characterized in that the recesses (24) have different cross sections.
  7. The rotary piston pump (10) according to one of claims 1 to 6, characterized in that a distance exists between the recesses (24).
  8. The rotary piston pump (10) according to one of claims 1 to 7, characterized in that the recesses (24) have a depth, wherein the depth is at least ten to thirty percent of the wall thickness of the lining (18).
  9. The rotary piston pump according to one of claims 1 to 8, characterized in that the recesses (24) have different depths.
EP13726670.6A 2012-05-02 2013-04-09 Rotary piston pump with optimised inlet and outlet Active EP2852762B1 (en)

Applications Claiming Priority (2)

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DE102012008527A DE102012008527B3 (en) 2012-05-02 2012-05-02 ROTARY PISTON PUMP WITH OPTIMIZED INPUTS AND OUTLETS
PCT/DE2013/100127 WO2013163987A1 (en) 2012-05-02 2013-04-09 Rotary piston pump with optimised inlets and outlets

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EP2852762A1 EP2852762A1 (en) 2015-04-01
EP2852762B1 true EP2852762B1 (en) 2018-10-31

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EP (1) EP2852762B1 (en)
JP (1) JP6236064B2 (en)
KR (1) KR101695076B1 (en)
CN (1) CN104285063B (en)
AR (1) AR090913A1 (en)
BR (1) BR112014026872B1 (en)
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RU (1) RU2601042C2 (en)
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WO (1) WO2013163987A1 (en)

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JP6236064B2 (en) 2017-11-22
JP2015516037A (en) 2015-06-04
US9617992B2 (en) 2017-04-11
TWI537469B (en) 2016-06-11
RU2601042C2 (en) 2016-10-27
RU2014148250A (en) 2016-06-20
US20150050174A1 (en) 2015-02-19
TW201405011A (en) 2014-02-01
KR101695076B1 (en) 2017-01-10
BR112014026872B1 (en) 2021-11-30
WO2013163987A1 (en) 2013-11-07
KR20140142358A (en) 2014-12-11
EP2852762A1 (en) 2015-04-01
DE102012008527B3 (en) 2013-07-25
BR112014026872A2 (en) 2017-06-27
CN104285063B (en) 2017-06-30
CN104285063A (en) 2015-01-14
AR090913A1 (en) 2014-12-17

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