EP2916007B1 - Screw spindle pump - Google Patents

Screw spindle pump Download PDF

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Publication number
EP2916007B1
EP2916007B1 EP14195862.9A EP14195862A EP2916007B1 EP 2916007 B1 EP2916007 B1 EP 2916007B1 EP 14195862 A EP14195862 A EP 14195862A EP 2916007 B1 EP2916007 B1 EP 2916007B1
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EP
European Patent Office
Prior art keywords
plate
spindles
spindle
screw spindle
pump according
Prior art date
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EP14195862.9A
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German (de)
French (fr)
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EP2916007A1 (en
Inventor
Jürgen Metz
Kris Zemanek
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Leistritz Pumpen GmbH
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Leistritz Pumpen GmbH
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Priority to SI201430210A priority Critical patent/SI2916007T1/en
Priority to PL14195862T priority patent/PL2916007T3/en
Publication of EP2916007A1 publication Critical patent/EP2916007A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C3/00—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type
    • F04C3/06—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged otherwise than at an angle of 90 degrees
    • F04C3/08—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged otherwise than at an angle of 90 degrees of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C3/085—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged otherwise than at an angle of 90 degrees of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing the axes of cooperating members being on the same plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
    • 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
    • F04C2/16—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 helical teeth, e.g. chevron-shaped, screw type

Definitions

  • the invention relates to a screw pump, comprising a housing in which a drive spindle and at least one spindle are received with interlocking profile packages, wherein the free end of the drive spindle and the end portion of the spindle are supported on a transversely disposed plate in the housing.
  • Screw pumps of this kind are z. B. used as a fuel pump.
  • a fuel delivery unit is known, with a housing in which an electric motor is arranged.
  • the shaft of the electric motor is rotatably connected to a drive spindle, however, the power transmission of the motor to the drive spindle with the aid of a coupling element (see DE 43 08 755 A1 ) be initiated.
  • the rotation of the motor or the drive spindle causes the spindle to rotate.
  • displacement chambers are formed together with the housing through which a fluid conveyed is conveyed axially from the suction side to the pressure side.
  • the free end of the drive spindle and the end portion of the spindle are supported axially there on a designated as a bearing end plate. The pumped fluid flows past on both sides of the bearing front.
  • the profile gaps increase, predominantly on the suction side of the screw pump, which increases the leakage of the pump. This occurs especially at elevated media temperatures, resulting in degraded hot-feed behavior.
  • the enlargement of the profile gaps also leads to a reduction in the efficiency.
  • the undefined movement of the spindles causes increased Saugpulsation what is also undesirable.
  • the rolling line formed between the two or more spindles is adversely affected by frictional effects, thereby increasing the drive torque to be applied by the electric motor.
  • the unwanted wobble of the spindles also leads to increased wear.
  • FIG. 1 shows a plate 1 of a conventional screw pump.
  • the plate 1 has the shape of a feather key and has a flat upper side 2.
  • the two arrows 3, 4 symbolize the longitudinal axes of a drive spindle and a running spindle.
  • FIG. 1 can be seen that the two spindles on the top 2 perform a tumbling motion, that is, the ends of the spindles "wander", resulting in a skew, which is particularly good in the FIGS. 2 and 3 you can see.
  • FIG. 2 it can be seen that the spindles have moved away from a parallel starting position on the suction side of the screw pump, on the upper side 2 of the plate 1, apart.
  • FIG. 3 is a 90 ° rotated view of FIG.
  • the spindles are also with respect to an imaginary plane, in which ideally parallel spindle axes are unevenly shifted, so that the spindle 4 is located in front of this imaginary plane and the other spindle 3 is behind this imaginary plane.
  • the invention is therefore based on the object to provide a screw pump in which no tumbling motion of the spindles occurs.
  • the plate has two oppositely inclined, forming a V-shape surfaces, on each of which one of the spindles is supported.
  • the inventively provided inclination of the surfaces counteracts an entanglement of the spindles. This ensures a highly accurate parallel alignment of the spindles, which avoids the problems described.
  • the inclined surfaces cause the end portions of the at least two spindles always undergo a mutually directed force, whereby a occurring in conventional screw pumps tumbling motion is suppressed. Thus, an at least small transverse force acts on the end portion of the spindles, thereby maintaining the spindles in the ideal position.
  • the inclination of the surfaces is selected so that the spindles are arranged parallel to each other during operation of the screw pump. This parallel positioning results in an optimal rolling line between the spindles, which reduces the required drive torque.
  • a particularly advantageous embodiment of the invention provides that the angle of inclination between the inclined surfaces and the plate between 2 ° and 30 °, with a range between 2 ° and 12 ° is preferred.
  • the surfaces are inclined relative to one another in such a way that the spindles experience a force component which presses or moves the spindles against one another.
  • both inclined surfaces have the same angle of inclination.
  • the angle of inclination is determined taking into account the medium to be pumped and other parameters such as pressure, speed and viscosity so that the spindles during operation are positioned parallel to each other and perpendicular to the plate.
  • both inclined surfaces have the same inclination angle.
  • first inclined surface is inclined to one longitudinal side of the plate and the second inclined surface to the opposite longitudinal side of the plate.
  • each surface is inclined twice, on the one hand, the two surfaces are inclined opposite to each other, so that the V-shape results, in addition, each surface is inclined to a longitudinal side of the plate, wherein the two surfaces are inclined in opposite directions.
  • the ends of the spindles have two degrees of freedom of movement as they can move on top of the plate.
  • the mentioned inclination to a longitudinal side of the plate may be 2 ° to 30 °, preferably it is between 2 ° and 12 °.
  • the V-shape forming slope of the surfaces is the same size as the inclination of the two surfaces to a longitudinal side.
  • the V-shaped inclination has a different inclination angle than the inclination to the longitudinal side.
  • a groove is provided between the two inclined surfaces.
  • the provision of this groove simplifies the manufacture of the inclined surface plate, since each inclined surface can then be made by a milling process.
  • the free end of the drive spindle and / or the end portion of the spindle has a conical tip whose cone angle is smaller than the inclination angle between the inclined surfaces and the plate. This ensures that the ends of the spindles can always move on the plate.
  • the plate is designed as a feather key. If necessary, a standard-compliant key can be provided by a milling process with the inclined surfaces.
  • the screw pump according to the invention can also be designed so that it has a drive spindle and two arranged on opposite sides of the spindles. In such a configuration, correspondingly inclined surfaces are provided at least for the two spindles.
  • FIG. 4 shows the essential components of a screw pump 5, comprising a housing 6, in which a drive spindle 7 and a spindle 8 are received. Both spindles have intermeshing profile packages.
  • An electric motor 9 drives the drive spindle 7, by the opposite rotation of the two spindles 7, 8, a fluid, for example, a fuel for an internal combustion engine, sucked through an intake manifold 10. The fluid flows through the electric motor 9 and leaves the housing 6 via an outlet 11.
  • the free end of the drive spindle 7 and the end portion of the spindle 8 are supported on a transversely arranged in the housing 6 with respect to the spindles plate 12 from. On both sides of the plate 12 is a free space provided, which is limited by the housing 6, so that the fluid can flow through these spaces.
  • FIG. 5 shows the plate 12 in a perspective view.
  • the plate 12 is in accordance with the in FIG. 1 shown plate the basic shape of a feather key, unlike the plate of FIG. 1 the plate 12 on its upper side two oppositely inclined surfaces 13, 14, on each of which one of the spindles is supported.
  • the arrows 3, 4 symbolically represent the longitudinal axis of the spindle and the drive spindle.
  • the inclination of the two surfaces 13, 14 is selected so that they intersect along a line (imaginary), as best seen in the side view of FIG FIG. 6 is recognizable.
  • the two surfaces 13, 14 are inclined to each other, so that they form an at least slight V-shape.
  • a transverse groove 15 is provided between the two surfaces 13, 14.
  • Recognizable inclination of the two surfaces 13, 14 counteracts the described entanglement of the spindles, so that they are held in the ideal position so that they are arranged in parallel.
  • FIG. 7 is a 90 ° rotated view of FIG. 6 and shows symbolically by the two arrows that the axes of the drive spindle 7 and the spindle 8 are exactly parallel in this plane. At the same time drive spindle 7 and spindle 8 are arranged exactly perpendicular to the transverse direction, which corresponds for example to the bottom 16 of the plate 12.
  • the two inclined surfaces 13, 14 are additionally inclined in opposite directions to longitudinal sides of the plate 12.
  • the surface 13 is in the view of FIG. 5 tilted forward, the surface 14, however, to the rear.
  • the combination of the surfaces 13, 14 which are inclined twice, that is to say about two axes of rotation, ensures that no entanglement of the spindles 7, 8 occurs and that they are held exactly parallel to the desired ideal position.
  • the end portions of the two spindles 7, 8 each have a cone angle which is smaller than the inclination angle.
  • FIG. 8 shows a further embodiment of a plate for a screw pump.
  • the plate 21 has two oppositely inclined, a V-shape forming surfaces 22, 23, on each of which one of the spindles 7, 8 is supported. Unlike the one in the FIGS. 5 to 7 As shown, the plate 21 has no groove.
  • the inclined surfaces 22, 23 are formed symmetrically and extend from a median plane of the plate 21 to an elevated, further outward position, whereby the V-shape is formed.
  • the surfaces 22, 23 are inclined only about an axis. For technical reasons, the in FIG. 8 shown plate 21 with respect to the other embodiments preferred.
  • FIG. 9 is another embodiment and shows a plate 17, which is provided for a screw pump with a drive spindle and two lead screws.
  • the two lead screws are located on opposite sides of the lead screw.
  • the plate 17 comprises two oppositely inclined surfaces 18, 19 on which the lead screws are supported. In between there is a flat surface 20 on which the drive spindle is axially supported. Due to the inclined surfaces 18, 19, the two running spindles orient the drive spindle and are also inclined opposite to each other with respect to the imaginary connecting line, analogously to the surfaces 13, 14 of the plate 12.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • External Artificial Organs (AREA)

Description

Die Erfindung betrifft eine Schraubenspindelpumpe, mit einem Gehäuse, in dem eine Antriebsspindel und wenigstens eine Laufspindel mit ineinander eingreifenden Profilpaketen aufgenommen sind, wobei das freie Ende der Antriebsspindel und der Endabschnitt der Laufspindel auf einer im Gehäuse quer angeordneten Platte abgestützt sind.The invention relates to a screw pump, comprising a housing in which a drive spindle and at least one spindle are received with interlocking profile packages, wherein the free end of the drive spindle and the end portion of the spindle are supported on a transversely disposed plate in the housing.

Schraubenspindelpumpen dieser Art werden z. B. als Kraftstoffpumpe eingesetzt. Aus der DE 41 23 384 A1 ist ein Kraftstoffförderaggregat bekannt, mit einem Gehäuse, in dem ein Elektromotor angeordnet ist. Die Welle des Elektromotors ist drehfest mit einer Antriebsspindel verbunden, jedoch kann die Kraftübertragung des Motors auf die Antriebsspindel auch mit Hilfe eines Kupplungselementes (siehe DE 43 08 755 A1 ) eingeleitet werden. Durch die Drehung des Motors bzw. der Antriebsspindel wird die Laufspindel in Rotation versetzt. Durch die Profilpakte, die auch als Förderprofile bezeichnet werden, und die an der Antriebsspindel und der oder den Laufspindeln vorgesehen sind, werden gemeinsam mit dem Gehäuse Verdrängerräume gebildet, durch die ein gefördertes Fluid axial von der Saugseite zur Druckseite befördert wird. Bei der aus der DE 41 23 384 A1 bekannten Schraubenspindelpumpe sind das freie Ende der Antriebsspindel und der Endabschnitt der Laufspindel auf einer dort als Lagerstirn bezeichneten Platte axial abgestützt. Das geförderte Fluid strömt beidseitig an der Lagerstirn vorbei.Screw pumps of this kind are z. B. used as a fuel pump. From the DE 41 23 384 A1 a fuel delivery unit is known, with a housing in which an electric motor is arranged. The shaft of the electric motor is rotatably connected to a drive spindle, however, the power transmission of the motor to the drive spindle with the aid of a coupling element (see DE 43 08 755 A1 ) be initiated. The rotation of the motor or the drive spindle causes the spindle to rotate. Due to the profile pacts, which are also referred to as conveyor profiles, and which are provided on the drive spindle and the one or more spindles, displacement chambers are formed together with the housing through which a fluid conveyed is conveyed axially from the suction side to the pressure side. At the time of the DE 41 23 384 A1 known screw pump, the free end of the drive spindle and the end portion of the spindle are supported axially there on a designated as a bearing end plate. The pumped fluid flows past on both sides of the bearing front.

Aus US 1 991 541 ist eine Pumpe mit zwei miteinander kämmenden, parallel angeordneten Spindeln, die in einem Gehäuse aufgenommen sind, bekannt. Die Spindeln werden über Wellen gelagert, welche über ein Getriebe miteinander gekoppelt sind. Eine der Wellen ist angetrieben, ihr Antrieb wird über das Getriebe auf die zweite Welle gekoppelt, so dass beide Spindeln aktiv angetrieben werden.Out US 1 991 541 is a pump with two intermeshing, parallel spindles, which are accommodated in a housing known. The spindles are supported by shafts, which are coupled to each other via a gearbox. One of the shafts is driven, its drive is coupled via the gearbox to the second shaft, so that both spindles are actively driven.

Obwohl sich diese Kraftstoffpumpe seit mehreren Jahrzehnten bewährt hat, wurde festgestellt, dass unter bestimmten Umständen in Abhängigkeit von Bauteiltoleranzen und Druckverhältnissen eine unerwünschte Bewegung der Spindeln auftreten kann. Diese Bewegung ist undefiniert bzw. unregelmäßig, primär handelt es sich dabei um eine Verschränkung der Spindeln. Diese Verschränkung bewirkt, dass die Längsachsen der wenigstens zwei Spindeln nicht exakt parallel angeordnet sind sondern einen Winkel miteinander bilden. Daher können die Längsachsen der wenigstens zwei Spindeln auch gegenüber einer gedachten Ebene, in der beide Längsachsen im Idealfall liegen, verschoben bzw. verschränkt sein, wobei eine Spindel von einer Seite der gedachten Ebene und die andere Spindel von der gegenüberliegenden Seite der gedachten Ebene absteht. Diese zu beobachtende Spindelbewegung führt zu nachteiligen Effekten. Einerseits vergrößern sich die Profilspalte, vorwiegend an der Saugseite der Schraubenspindelpumpe, wodurch sich die Leckage der Pumpe erhöht. Dies tritt insbesondere bei erhöhten Mediumtemperaturen auf, was zu einem verschlechtertem Heißförderverhalten führt. Die Vergrößerung der Profilspalte führt andererseits auch zu einer Verringerung des Wirkungsgrads. Zusätzlich bewirkt die undefinierte Bewegung der Spindeln eine erhöhte Saugpulsation was ebenfalls unerwünscht ist. Die zwischen den zwei oder mehr Spindeln gebildete Abwälzlinie wird durch Reibungseffekte negativ beeinflusst, wodurch sich das von dem Elektromotor aufzubringende Antriebsmoment erhöht. Darüber hinaus führt die unerwünschte Taumelbewegung der Spindeln auch zu einem erhöhten Verschleiß.Although this fuel pump has been proven for several decades, it has been found that under certain circumstances, depending on component tolerances and pressure conditions, an undesirable movement of the Spindles can occur. This movement is undefined or irregular, it is primarily an entanglement of the spindles. This entanglement causes the longitudinal axes of the at least two spindles are not arranged exactly parallel but form an angle with each other. Therefore, the longitudinal axes of the at least two spindles may also be displaced from an imaginary plane in which both longitudinal axes ideally lie, with a spindle projecting from one side of the imaginary plane and the other spindle protruding from the opposite side of the imaginary plane. This observed spindle movement leads to adverse effects. On the one hand, the profile gaps increase, predominantly on the suction side of the screw pump, which increases the leakage of the pump. This occurs especially at elevated media temperatures, resulting in degraded hot-feed behavior. On the other hand, the enlargement of the profile gaps also leads to a reduction in the efficiency. In addition, the undefined movement of the spindles causes increased Saugpulsation what is also undesirable. The rolling line formed between the two or more spindles is adversely affected by frictional effects, thereby increasing the drive torque to be applied by the electric motor. In addition, the unwanted wobble of the spindles also leads to increased wear.

Figur 1 zeigt eine Platte 1 einer herkömmlichen Schraubenspindelpumpe. Die Platte 1 weist die Form einer Passfeder auf und besitzt eine ebene Oberseite 2. Die beiden Pfeile 3, 4 stehen symbolisch für die Längsachsen einer Antriebsspindel und einer Laufspindel. In Figur 1 erkennt man, dass die beiden Spindeln auf der Oberseite 2 eine Taumelbewegung durchführen, das heißt die Enden der Spindeln "wandern", wodurch sich eine Schrägstellung ergibt, die besonders gut in den Figuren 2 und 3 zu sehen ist. In Figur 2 erkennt man, dass sich die Spindeln ausgehend von einer parallelen Ausgangsposition an der Saugseite der Schraubenspindelpumpe, auf der Oberseite 2 der Platte 1, auseinander bewegt haben. Figur 3 ist eine um 90° gedrehte Ansicht von Figur 2, dort erkennt man, dass die Spindeln auch bezüglich einer gedachten Ebene, in der ideal parallele Spindelachsen liegen, ungleichmäßig verschoben sind, so dass die Spindel 4 sich vor dieser gedachten Ebene und die andere Spindel 3 sich hinter dieser gedachten Ebene befindet. FIG. 1 shows a plate 1 of a conventional screw pump. The plate 1 has the shape of a feather key and has a flat upper side 2. The two arrows 3, 4 symbolize the longitudinal axes of a drive spindle and a running spindle. In FIG. 1 can be seen that the two spindles on the top 2 perform a tumbling motion, that is, the ends of the spindles "wander", resulting in a skew, which is particularly good in the FIGS. 2 and 3 you can see. In FIG. 2 it can be seen that the spindles have moved away from a parallel starting position on the suction side of the screw pump, on the upper side 2 of the plate 1, apart. FIG. 3 is a 90 ° rotated view of FIG. 2 , there you can see that the spindles are also with respect to an imaginary plane, in which ideally parallel spindle axes are unevenly shifted, so that the spindle 4 is located in front of this imaginary plane and the other spindle 3 is behind this imaginary plane.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Schraubenspindelpumpe anzugeben, bei der keine Taumelbewegung der Spindeln auftritt.The invention is therefore based on the object to provide a screw pump in which no tumbling motion of the spindles occurs.

Zur Lösung dieser Aufgabe ist bei einer Schraubenspindelpumpe der eingangs genannten Art erfindungsgemäß vorgesehen, dass die Platte zwei entgegengesetzt zueinander geneigte, eine V-Form bildende Flächen aufweist, auf denen jeweils eine der Spindeln abgestützt ist.To solve this problem is provided according to the invention in a screw pump of the type mentioned that the plate has two oppositely inclined, forming a V-shape surfaces, on each of which one of the spindles is supported.

Die erfindungsgemäß vorgesehene Neigung der Flächen wirkt einer Verschränkung der Spindeln entgegen. Dadurch wird eine hochgradig exakt parallele Ausrichtung der Spindeln sichergestellt, wodurch die beschriebenen Probleme vermieden werden. Die geneigten Flächen bewirken, dass die Endabschnitte der wenigstens zwei Spindeln stets eine zueinander gerichtete Kraft erfahren, wodurch eine bei herkömmlichen Schraubenspindelpumpen auftretende Taumelbewegung unterdrückt wird. Auf den Endabschnitt der Spindeln wirkt somit eine zumindest kleine Kraft in Querrichtung ein, wodurch die Spindeln an der idealen Position gehalten werden.The inventively provided inclination of the surfaces counteracts an entanglement of the spindles. This ensures a highly accurate parallel alignment of the spindles, which avoids the problems described. The inclined surfaces cause the end portions of the at least two spindles always undergo a mutually directed force, whereby a occurring in conventional screw pumps tumbling motion is suppressed. Thus, an at least small transverse force acts on the end portion of the spindles, thereby maintaining the spindles in the ideal position.

Bei der erfindungsgemäßen Schraubenspindelpumpe wird es besonders bevorzugt, dass die Neigung der Flächen so gewählt ist, dass die Spindeln während des Betriebs der Schraubenspindelpumpe parallel zueinander angeordnet sind. Durch diese parallele Positionierung ergibt sich eine optimale Abwälzlinie zwischen den Spindeln, wodurch sich das benötigte Antriebsmoment verringert.In the screw pump according to the invention, it is particularly preferred that the inclination of the surfaces is selected so that the spindles are arranged parallel to each other during operation of the screw pump. This parallel positioning results in an optimal rolling line between the spindles, which reduces the required drive torque.

Eine besonders günstige Ausgestaltung der Erfindung sieht vor, dass der Neigungswinkel zwischen den geneigten Flächen und der Platte zwischen 2° und 30° liegt, wobei ein Bereich zwischen 2° und 12° bevorzugt wird. Wie bereits erwähnt sind die Flächen dabei so zueinander geneigt, dass die Spindeln eine Kraftkomponente erfahren, die die Spindeln gegeneinander drückt bzw. bewegt.A particularly advantageous embodiment of the invention provides that the angle of inclination between the inclined surfaces and the plate between 2 ° and 30 °, with a range between 2 ° and 12 ° is preferred. As already mentioned, the surfaces are inclined relative to one another in such a way that the spindles experience a force component which presses or moves the spindles against one another.

Betrachtet man die Platte mit den beiden entgegengesetzt zueinander geneigten Flächen von der Seite, so weist diese eine V-Form auf.Looking at the plate with the two oppositely inclined surfaces from the side, so this has a V-shape.

Erfindungsgemäß wird es besonders bevorzugt, dass beide geneigte Flächen denselben Neigungswinkel aufweisen. Der Neigungswinkel wird dabei unter Berücksichtigung des zu fördernden Mediums und weiterer Parameter wie Druck, Drehzahl und Viskosität so festgelegt, dass die Spindeln während des Betriebs parallel zueinander und senkrecht zu der Platte positioniert sind.According to the invention, it is particularly preferred that both inclined surfaces have the same angle of inclination. The angle of inclination is determined taking into account the medium to be pumped and other parameters such as pressure, speed and viscosity so that the spindles during operation are positioned parallel to each other and perpendicular to the plate.

Dadurch ergibt sich eine ganze Reihe von positiven Auswirkungen auf die erfindungsgemäße Schraubenspindelpumpe. Die optimale Ausrichtung der Antriebsspindel und der Laufspindel führt zu einer Verringerung der Leckage. Der Wirkungsgrad steigt im Vergleich zu herkömmlichen Schraubenspindelpumpen an. Darüber hinaus verringert sich die unerwünschte Saugpulsation. Ein weiterer positiver Effekt ist das verbesserte Heißförderverhalten der Pumpe.This results in a whole series of positive effects on the screw pump according to the invention. The optimal alignment of the drive spindle and the spindle leads to a reduction of the leakage. The efficiency increases compared to conventional screw pumps. In addition, the unwanted Saugpulsation reduced. Another positive effect is the improved hot-conveying behavior of the pump.

Bei der erfindungsgemäßen Schraubenspindelpumpe wird es bevorzugt, dass beide geneigte Flächen denselben Neigungswinkel aufweisen.In the screw pump according to the invention, it is preferred that both inclined surfaces have the same inclination angle.

Es hat sich als ganz besonders günstig herausgestellt, dass die erste geneigte Fläche zu einer Längsseite der Platte und die zweite geneigte Fläche zu der entgegengesetzten Längsseite der Platte geneigt ist. Somit ist jede Fläche zweifach geneigt, einerseits sind die beiden Flächen entgegengesetzt zueinander geneigt, so dass sich die V-Form ergibt, zusätzlich ist jede Fläche zu einer Längsseite der Platte geneigt, wobei die beiden Flächen in entgegengesetzte Richtungen geneigt sind. Dahinter steht die Überlegung, dass die Enden der Spindeln zwei Bewegungsfreiheitsgrade besitzen, da sie sich auf der Oberseite der Platte bewegen können. Durch die erfindungsgemäß vorgesehene zweifache Neigung der beiden Flächen kann die ansonsten stattfindende Taumelbewegung bzw. Verschränkung der Spindeln praktisch vollständig unterdrückt werden.It has been found to be particularly favorable that the first inclined surface is inclined to one longitudinal side of the plate and the second inclined surface to the opposite longitudinal side of the plate. Thus, each surface is inclined twice, on the one hand, the two surfaces are inclined opposite to each other, so that the V-shape results, in addition, each surface is inclined to a longitudinal side of the plate, wherein the two surfaces are inclined in opposite directions. The idea behind this is that the ends of the spindles have two degrees of freedom of movement as they can move on top of the plate. By inventively provided two-fold inclination of the two surfaces, the otherwise occurring tumbling motion or entanglement of the spindles can be almost completely suppressed.

Die erwähnte Neigung zu einer Längsseite der Platte kann 2° bis 30° betragen, vorzugsweise liegt sie zwischen 2° und 12°. Bei der erfindungsgemäßen Schraubenspindelpumpe wird es bevorzugt, dass die die V-Form bildende Neigung der Flächen gleich groß ist wie die Neigung der beiden Flächen zu einer Längsseite. Es sind jedoch auch Ausführungsbeispiele denkbar, bei denen die V-förmige Neigung einen anderen Neigungswinkel als die Neigung zur Längsseite aufweist.The mentioned inclination to a longitudinal side of the plate may be 2 ° to 30 °, preferably it is between 2 ° and 12 °. In the inventive Screw pump, it is preferred that the V-shape forming slope of the surfaces is the same size as the inclination of the two surfaces to a longitudinal side. However, embodiments are also conceivable in which the V-shaped inclination has a different inclination angle than the inclination to the longitudinal side.

Aus fertigungstechnischen Gründen kann es vorgesehen sein, dass zwischen den beiden geneigten Flächen eine Nut vorgesehen ist. Durch das Vorsehen dieser Nut wird die Herstellung der Platte mit den geneigten Flächen vereinfacht, da jede geneigte Fläche dann durch ein Fräsverfahren hergestellt werden kann.For technical reasons, it may be provided that a groove is provided between the two inclined surfaces. The provision of this groove simplifies the manufacture of the inclined surface plate, since each inclined surface can then be made by a milling process.

Es liegt auch im Rahmen der Erfindung, dass das freie Ende der Antriebsspindel und/oder der Endabschnitt der Laufspindel eine kegelförmige Spitze aufweist bzw. aufweisen, deren Kegelwinkel kleiner als der Neigungswinkel zwischen den geneigten Flächen und der Platte ist. Dadurch ist sichergestellt, dass sich die Enden der Spindeln stets auf der Platte bewegen können.It is also within the scope of the invention that the free end of the drive spindle and / or the end portion of the spindle has a conical tip whose cone angle is smaller than the inclination angle between the inclined surfaces and the plate. This ensures that the ends of the spindles can always move on the plate.

Im Rahmen der Erfindung kann es vorgesehen sein, dass die Platte als Passfeder ausgebildet ist. Gegebenenfalls kann eine normgerechte Passfeder durch ein Fräsverfahren mit den geneigten Flächen versehen werden.In the context of the invention it can be provided that the plate is designed as a feather key. If necessary, a standard-compliant key can be provided by a milling process with the inclined surfaces.

Die erfindungsgemäße Schraubenspindelpumpe kann auch so ausgebildet sein, dass sie eine Antriebsspindel und zwei an gegenüberliegenden Seiten angeordnete Laufspindeln aufweist. Bei einer derartigen Konfiguration sind zumindest für die beiden Laufspindeln entsprechend geneigte Flächen vorgesehen.The screw pump according to the invention can also be designed so that it has a drive spindle and two arranged on opposite sides of the spindles. In such a configuration, correspondingly inclined surfaces are provided at least for the two spindles.

Weitere Vorteile und Einzelheiten der Erfindung werden nachfolgend anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnungen erläutert. Die Zeichnungen sind schematische Darstellungen und zeigen:

Figur 1
eine Platte einer herkömmlichen Schraubenspindelpumpe in einer perspektivischen Ansicht;
Figur 2
eine Seitenansicht der Platte von Figur 1;
Figur 3
eine Stirnansicht der in Figur 1 gezeigten Platte;
Figur 4
eine erfindungsgemäße Schraubenspindelpumpe in einer geschnittenen Seitenansicht;
Figur 5
eine Platte der in Figur 4 gezeigten Schraubenspindelpumpe;
Figur 6
eine Seitenansicht der in Figur 5 gezeigten Platte;
Figur 7
eine Stirnansicht der in Figur 5 gezeigten Platte;
Figur 8
ein weiteres Ausführungsbeispiel einer Platte für eine erfindungsgemäße Schraubenspindelpumpe; und
Figur 9
eine Platte für eine erfindungsgemäße Schraubenspindelpumpe mit einer Antriebsspindel und zwei Laufspindeln.
Further advantages and details of the invention will be explained below with reference to embodiments with reference to the drawings. The drawings are schematic representations and show:
FIG. 1
a plate of a conventional screw pump in a perspective view;
FIG. 2
a side view of the plate of FIG. 1 ;
FIG. 3
an end view of in FIG. 1 plate shown;
FIG. 4
a screw pump according to the invention in a sectional side view;
FIG. 5
a plate of in FIG. 4 shown screw pump;
FIG. 6
a side view of in FIG. 5 plate shown;
FIG. 7
an end view of in FIG. 5 plate shown;
FIG. 8
a further embodiment of a plate for a screw pump according to the invention; and
FIG. 9
a plate for a screw pump according to the invention with a drive spindle and two spindles.

Figur 4 zeigt die wesentlichen Komponenten einer Schraubenspindelpumpe 5, umfassend ein Gehäuse 6, in dem eine Antriebsspindel 7 und eine Laufspindel 8 aufgenommen sind. Beide Spindeln weisen miteinander kämmende Profilpakete auf. Ein Elektromotor 9 treibt die Antriebsspindel 7 an, durch die gegensätzliche Rotation der beiden Spindeln 7, 8 wird ein Fluid, beispielsweise ein Kraftstoff für einen Verbrennungsmotor, durch einen Ansaugstutzen 10 angesaugt. Das Fluid durchströmt den Elektromotor 9 und verlässt das Gehäuse 6 über einen Auslass 11. FIG. 4 shows the essential components of a screw pump 5, comprising a housing 6, in which a drive spindle 7 and a spindle 8 are received. Both spindles have intermeshing profile packages. An electric motor 9 drives the drive spindle 7, by the opposite rotation of the two spindles 7, 8, a fluid, for example, a fuel for an internal combustion engine, sucked through an intake manifold 10. The fluid flows through the electric motor 9 and leaves the housing 6 via an outlet 11.

Das freie Ende der Antriebsspindel 7 und der Endabschnitt der Laufspindel 8 stützen sich auf einer in dem Gehäuse 6 quer bezüglich der Spindeln angeordneten Platte 12 ab. An beiden Seiten der Platte 12 ist jeweils ein Freiraum vorgesehen, der durch das Gehäuse 6 begrenzt wird, so dass das Fluid durch diese Freiräume einströmen kann.The free end of the drive spindle 7 and the end portion of the spindle 8 are supported on a transversely arranged in the housing 6 with respect to the spindles plate 12 from. On both sides of the plate 12 is a free space provided, which is limited by the housing 6, so that the fluid can flow through these spaces.

Figur 5 zeigt die Platte 12 in einer perspektivischen Ansicht. Die Platte 12 weist in Übereinstimmung zu der in Figur 1 gezeigten Platte die Grundform einer Passfeder auf, im Unterschied zu der Platte von Figur 1 weist die Platte 12 auf ihrer Oberseite zwei entgegengesetzt zueinander geneigte Flächen 13, 14 auf, auf denen jeweils eine der Spindeln abgestützt ist. Die Pfeile 3, 4 stellen jeweils symbolisch die Längsachse der Laufspindel und der Antriebsspindel dar. Die Neigung der beiden Flächen 13, 14 ist so gewählt, dass sie sich entlang einer (gedachten) Linie schneiden, wie am besten in der Seitenansicht von Figur 6 erkennbar ist. Die beiden Flächen 13, 14 sind zueinander geneigt, so dass sie eine zumindest leichte V-Form bilden. Aus fertigungstechnischen Gründen ist zwischen den beiden Flächen 13, 14 eine quer verlaufende Nut 15 vorgesehen. Die in Figur 6 erkennbare Neigung der beiden Flächen 13, 14 wirkt der beschriebenen Verschränkung der Spindeln entgegen, so dass diese an der idealen Position gehalten werden, so dass sie parallel angeordnet sind. FIG. 5 shows the plate 12 in a perspective view. The plate 12 is in accordance with the in FIG. 1 shown plate the basic shape of a feather key, unlike the plate of FIG. 1 the plate 12 on its upper side two oppositely inclined surfaces 13, 14, on each of which one of the spindles is supported. The arrows 3, 4 symbolically represent the longitudinal axis of the spindle and the drive spindle. The inclination of the two surfaces 13, 14 is selected so that they intersect along a line (imaginary), as best seen in the side view of FIG FIG. 6 is recognizable. The two surfaces 13, 14 are inclined to each other, so that they form an at least slight V-shape. For manufacturing reasons, a transverse groove 15 is provided between the two surfaces 13, 14. In the FIG. 6 Recognizable inclination of the two surfaces 13, 14 counteracts the described entanglement of the spindles, so that they are held in the ideal position so that they are arranged in parallel.

Figur 7 ist eine um 90° gedrehte Ansicht von Figur 6 und zeigt symbolisch durch die beiden Pfeile, dass die Achsen der Antriebsspindel 7 und der Laufspindel 8 auch in dieser Ebene exakt parallel sind. Gleichzeitig sind Antriebsspindel 7 und Laufspindel 8 exakt senkrecht zur Querrichtung angeordnet, die beispielsweise der Unterseite 16 der Platte 12 entspricht. FIG. 7 is a 90 ° rotated view of FIG. 6 and shows symbolically by the two arrows that the axes of the drive spindle 7 and the spindle 8 are exactly parallel in this plane. At the same time drive spindle 7 and spindle 8 are arranged exactly perpendicular to the transverse direction, which corresponds for example to the bottom 16 of the plate 12.

In Figur 5 erkennt man, dass die beiden geneigten Flächen 13, 14 zusätzlich in entgegengesetzte Richtungen zu Längsseiten der Platte 12 geneigt sind. Die Fläche 13 ist dabei in der Ansicht von Figur 5 nach vorne geneigt, die Fläche 14 hingegen nach hinten. Die Kombination der zweifach, das heißt um zwei Drehachsen geneigten Flächen 13, 14 stellt sicher, dass keine Verschränkung der Spindeln 7, 8 auftritt und dass diese exakt parallel an der gewünschten Idealposition gehalten werden. Die Endabschnitte der beiden Spindeln 7, 8 weisen jeweils einen Kegelwinkel auf, der kleiner als die Neigungswinkel ist.In FIG. 5 it can be seen that the two inclined surfaces 13, 14 are additionally inclined in opposite directions to longitudinal sides of the plate 12. The surface 13 is in the view of FIG. 5 tilted forward, the surface 14, however, to the rear. The combination of the surfaces 13, 14 which are inclined twice, that is to say about two axes of rotation, ensures that no entanglement of the spindles 7, 8 occurs and that they are held exactly parallel to the desired ideal position. The end portions of the two spindles 7, 8 each have a cone angle which is smaller than the inclination angle.

Figur 8 zeigt ein weiteres Ausführungsbeispiel einer Platte für eine Schraubenspindelpumpe. Die Platte 21 weist zwei entgegengesetzt zueinander geneigte, eine V-Form bildende Flächen 22, 23 auf, auf denen jeweils eine der Spindeln 7, 8 abgestützt ist. Anders als bei dem in den Figuren 5 bis 7 gezeigten Ausführungsbeispiel weist die Platte 21 keine Nut auf. Die geneigten Flächen 22, 23 sind symmetrisch ausgebildet und erstrecken sich von einer Mittelebene der Platte 21 bis zu einer erhöhten weiter außen liegenden Position, wodurch die V-Form gebildet wird. Die Flächen 22, 23 sind lediglich um eine Achse geneigt. Aus fertigungstechnischen Gründen wird die in Figur 8 gezeigte Platte 21 gegenüber den anderen Ausführungsbeispielen bevorzugt. FIG. 8 shows a further embodiment of a plate for a screw pump. The plate 21 has two oppositely inclined, a V-shape forming surfaces 22, 23, on each of which one of the spindles 7, 8 is supported. Unlike the one in the FIGS. 5 to 7 As shown, the plate 21 has no groove. The inclined surfaces 22, 23 are formed symmetrically and extend from a median plane of the plate 21 to an elevated, further outward position, whereby the V-shape is formed. The surfaces 22, 23 are inclined only about an axis. For technical reasons, the in FIG. 8 shown plate 21 with respect to the other embodiments preferred.

Figur 9 ist ein weiteres Ausführungsbeispiel und zeigt eine Platte 17, die für eine Schraubenspindelpumpe mit einer Antriebsspindel und zwei Leitspindeln vorgesehen ist. Die beiden Leitspindeln befinden sich an entgegengesetzten Seiten der Leitspindel. Die Platte 17 umfasst zwei entgegengesetzt zueinander geneigte Flächen 18, 19 auf denen die Leitspindeln abgestützt sind. Dazwischen befindet sich eine ebene Fläche 20, auf der sich die Antriebsspindel axial abstützt. Die beiden Laufspindeln orientieren, bedingt durch die geneigten Flächen 18, 19, die Antriebsspindel und sind auch bezüglich der gedachten Verbindungslinie entgegengesetzt zueinander geneigt analog zu den Flächen 13, 14 der Platte 12. FIG. 9 is another embodiment and shows a plate 17, which is provided for a screw pump with a drive spindle and two lead screws. The two lead screws are located on opposite sides of the lead screw. The plate 17 comprises two oppositely inclined surfaces 18, 19 on which the lead screws are supported. In between there is a flat surface 20 on which the drive spindle is axially supported. Due to the inclined surfaces 18, 19, the two running spindles orient the drive spindle and are also inclined opposite to each other with respect to the imaginary connecting line, analogously to the surfaces 13, 14 of the plate 12.

Claims (10)

  1. Screw spindle pump (5) having a housing (6) in which a drive spindle (7) and at least one running spindle (8) having profile assemblies which engage inside each other are received, the free end of the drive spindle (7) and the end portion of the running spindle (8) being supported on a plate (12, 21) which is arranged in the housing (6), characterised in that the plate (12, 21) has two faces (13, 14, 22, 23) which are inclined in opposing directions relative to each other and which form a V-shape and on which one of the spindles (7, 8) is supported, respectively.
  2. Screw spindle pump according to Claim 1, characterised in that the inclination of the faces (13, 14, 22, 23) is selected in such a manner that the spindles (7, 8) are arranged parallel with each other during operation of the screw spindle pump (5).
  3. Screw spindle pump according to Claim 1 or 2, characterised in that the inclination angle between the faces (13, 14, 22, 23) and the plate (12) is from 2° to 30°, preferably from 2° to 12°.
  4. Screw spindle pump according to Claim 3, characterised in that both faces (13, 14, 22, 23) have the same angle of inclination.
  5. Screw spindle pump according to any one of the preceding claims, characterised in that the first inclined face (13) is inclined with respect to a longitudinal side of the plate (12) and the second inclined face (14) is inclined with respect to the opposing longitudinal side of the plate (12).
  6. Screw spindle pumps according to Claim 5, characterised in that the lateral inclination of the first and the second face (13, 14) is from 2° to 30°, preferably from 2° to 12°, respectively.
  7. Screw spindle pump according to any one of the preceding claims, characterised in that two inclined faces (13, 14) are spaced apart from each other by means of a groove.
  8. Screw spindle pump according to any one of the preceding claims, characterised in that the free end of the drive spindle (7) and/or the end portion of the running spindle (8) has/have a tapered tip whose angle of taper is smaller than the inclination angle between the inclined faces (13, 14, 22, 23) and the plate (12, 21).
  9. Screw spindle pump according to any one of the preceding claims, characterised in that the plate (12, 21) is constructed as a feather key.
  10. Screw spindle pump according to any one of the preceding claims, characterised in that it has a drive spindle and two running spindles which are arranged at opposing sides.
EP14195862.9A 2014-02-25 2014-12-02 Screw spindle pump Active EP2916007B1 (en)

Priority Applications (2)

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SI201430210A SI2916007T1 (en) 2014-02-25 2014-12-02 Screw spindle pump
PL14195862T PL2916007T3 (en) 2014-02-25 2014-12-02 Screw spindle pump

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DE201410102390 DE102014102390B3 (en) 2014-02-25 2014-02-25 Screw Pump

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JP6002790B2 (en) 2016-10-05
US20150240810A1 (en) 2015-08-27
US9765776B2 (en) 2017-09-19
PL2916007T3 (en) 2017-08-31
DE102014102390B3 (en) 2015-03-26
SI2916007T1 (en) 2017-07-31
JP2015161307A (en) 2015-09-07
CN104863847A (en) 2015-08-26
EP2916007A1 (en) 2015-09-09
CN104863847B (en) 2017-04-12

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