EP2138723B1 - Centrifugal pump with free flow wheel - Google Patents

Centrifugal pump with free flow wheel Download PDF

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Publication number
EP2138723B1
EP2138723B1 EP09007443.6A EP09007443A EP2138723B1 EP 2138723 B1 EP2138723 B1 EP 2138723B1 EP 09007443 A EP09007443 A EP 09007443A EP 2138723 B1 EP2138723 B1 EP 2138723B1
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EP
European Patent Office
Prior art keywords
flow
centrifugal pump
influencing means
pump according
influencing
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EP09007443.6A
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German (de)
French (fr)
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EP2138723A2 (en
EP2138723A3 (en
Inventor
Rolf Witzel
Christoph Jäger
Heinrich Braun
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KSB SE and Co KGaA
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KSB AG
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Publication of EP2138723A3 publication Critical patent/EP2138723A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2238—Special flow patterns
    • F04D29/2244—Free vortex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/688—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating

Definitions

  • the invention relates to a centrifugal pump, with a free-flow impeller mounted in a housing, wherein between a suction-side housing wall and the vortex impeller a blade-less space is arranged and the centrifugal pump is provided with a device for preventing the tearing of the flow, wherein at the suction-side housing wall at least one, in the blade-free space above, one or more parts, flow-influencing means is arranged.
  • the DE 14 53 735 A1 shows a centrifugal pump for conveying a mixture of liquids and solids. Opposite the blade edges of the impeller guide devices are arranged on the suction-side housing wall. The arrangement of running and guide wheels hydraulically favorable flow conditions are achieved, which makes it difficult to set admixtures.
  • the invention is based on the problem of providing a centrifugal pump with better conveying properties in the case of pumped media with constituents which tend to block.
  • the flow-influencing means is provided with at least one rupture means, wherein the flow-influencing means is provided with sharp edges and / or sharp fangs.
  • a further embodiment according to which the flow-influencing agent is provided with hardened edges, improves the effect and increases the long-term stability.
  • the flow-influencing means is arranged in the region of a suction opening in an arcuate manner on a partial circumference as a rib extending in the circumferential direction.
  • one or more tear means are arranged in the region of the contact lines of mutually different diameters and arranged in the blade-less space of mutually facing rib surfaces.
  • the flow-influencing means may have tearing means at its inner diameter and / or at its outer diameter. These can be incorporated by material removal from a rib body, for example by milling. A two-sided arrangement of tear means on a rib has proven to be particularly useful in experiments.
  • the flow-influencing agent has tear points and / or tear points.
  • the tear points and / or the tear points can be formed by edges arranged at an angle to one another.
  • the edge regions of a flow-influencing means are provided with a toothing.
  • tear or fangs such as pointed fangs and / or fangs, in its outer region are formed by an edge and thereby flattened.
  • a flow-influencing means has a plurality of tear points and / or tear points.
  • the side of the flow-influencing means facing the impeller forms a planar surface.
  • a continuous zone results in a central region of the flow-influencing means such that catching of a solid conveying component, such as a lobe, is prevented.
  • the flow-influencing means are provided with means of removal, which protrude into the blade-less space.
  • These may be, for example, pins, inserts or similar tear means, which are attached for example by screwing or clamping with the flow-influencing means.
  • an arc-shaped flow-influencing means has a maximum extension corresponding to 180 degrees of the housing circumference.
  • a maximum extension corresponding to 180 degrees of the housing circumference.
  • the flow-influencing means may have tapered contour curves. Such chamfers, which are particularly useful on the flow-facing side of a flow-influencing agent prevent laying a solid delivery component on the flow-influencing means.
  • the suction-side housing wall and the flow-influencing means may be formed as part of a housing cover. This allows, if necessary, a conversion of an existing free-flow pump and a quick and easy replacement of a housing cover. Thus, a centrifugal pump can also be retrofitted easily to an operation with tipping prone conveying fluids.
  • the flow-influencing means is releasably secured.
  • a centrifugal pump can therefore only be equipped with a flow-flowing means with tear means when needed. This is given by the releasable attachment a problem-free case by case adaptation to the respective counselkeitszusammen deren.
  • Various shapes and / or mounting positions have proven successful in practical experiments.
  • the Fig. 1 shows a centrifugal pump 1 for the promotion of a with tipping prone conveyor components interspersed delivery fluid.
  • the centrifugal pump 1 has a freely rotating impeller 3 arranged in a housing 2 with impeller blades 4, which is connected to a drive shaft 5. Between a suction-side housing wall 6 and the free-flow impeller 3, a blade-less space 7 is arranged.
  • the centrifugal pump 1 is connected to a - not shown here - discharge nozzle to a pipeline. Via a suction opening 9, the pumped liquid flows to the pump and it could also be connected to a - not shown here - suction line.
  • the impeller blades 4 opposite to the suction-side housing wall 6, a flow-influencing means 10 is arranged. In this case, a predominant part of the suction-side housing wall 6 is formed in this embodiment by a removable suction-side housing cover 11, with which the - here integrally formed - flow-influencing means 10 is connected.
  • the flow-influencing means 10 is here provided with a plurality of tear means 21, 23 in the form of sharp edges, tear points, tear points, various recesses and / or undercuts.
  • the flow-influencing means 10 and the tear means 21, 23 may have different shapes. Feeding-prone conveying components are torn by the tearing means 21, 23 in operation of the centrifugal pump 1 and crushed such that a promotion of the same through the pump outlet or discharge nozzle is possible.
  • the flow-influencing means 10 causes by its arrangement on the suction-side housing wall 6, a local reduction of the shovelless space 7, which are effectively torn and crushed to the rotating impeller 3 applying solid conveying components, such as cloths or nonwovens.
  • Various arrangements of the flow-axis flowing means 10 with its tear means 21, 23 are provided.
  • a straight flow-influencing means 10 for example purely radially, be arranged in a certain angle relative to a purely radial arrangement employed position or in a bent or arcuate execution of a flow-influencing means annular.
  • the Centrifugal pump 1 may have a variety of installation positions and is not limited to the vertical variant shown here.
  • the Fig. 2a and 2b show a suction-side housing cover 11 of a centrifugal pump in two perspective views.
  • the suction-side housing cover 11 has a suction opening 9 and three attachment locations 14, 15, 16 for attachment of the suction-side housing cover 11 on the housing 2 of the centrifugal pump 1.
  • On the suction-side housing cover 11 is a strömungsbeeinlendes means 10 in the region of the suction opening 9 arcuate on a partial circumference than arranged in the circumferential direction rib, wherein a plurality of tear means 21, 23 are arranged in the region of located on different diameters and arranged in the blade-less space lines of contact of mutually facing rib surfaces.
  • the tearing means 21 are on an inner side 22 or on the inner diameter of the flow-influencing means 10 and the tearing means 23 are formed on an outer side 24 or on the outer diameter of the flow-influencing means 10.
  • the flow-influencing means 10 has a plurality of tear points 26 and / or tear points.
  • the tear points 26 are formed by edges 28 arranged at an angle to each other, resulting in pointed fangs 30 on the inner diameter and pointed fangs 31 on the outer diameter.
  • the impeller 3 facing side of the flow-influencing means 10 has a flat surface 32. This results in a continuous zone between the fangs 30 in the region of the inner diameter and the fangs 31 in the region of the outer diameter such that a catching of solid conveying components is prevented.
  • the invention is not limited to such an embodiment, but it is provided, for example, that the flow-influencing means are provided with tear means that can protrude further into the blade-less space.
  • FIGS. 3a to 3e show the flow-influencing means 10 in several views. It shows the Fig. 3a a bottom view of the flow-influencing means 10.
  • the flow-influencing means 10 has two mounting holes 33, 34 for attachment to a housing cover.
  • a housing cover can be retrofitted with a flow-influencing agent with tear means or retrofitted.
  • Fig. 3b shows a front view of the flow-influencing means 10.
  • the flow-influencing means 10 has at one end beveled contour curves. It has a bevelled contour profile 35 and a bevelled contour curve 36, which results from a circumferentially increasing axial extent of the flow-influencing agent.
  • Fig. 3c shows the flow-influencing means 10 in its plan view.
  • the fangs 30 formed or formed on the inner diameter and the fangs 31 formed on the outer diameter are recognizable.
  • a middle region between the fangs 30, 31 at the inner diameter or at the outer diameter results in a over the entire extent of the flow-influencing agent 10 extending flat surface 32.
  • this side of the flow-influencing means 10 faces the impeller 3.
  • This flat zone 32 prevents entanglement of solid conveying components, such as cloths or nonwovens.
  • Fig. 3d and Fig. 3e show two sections through the flow-influencing means 10th
  • Fig. 4 shows the centrifugal pump 1 in a front view, in the illustration a cut-out area around the flow-influencing means 10 on the housing cover 11 is present to show the position of the flow-influencing means 10 within the pump housing 2 with its discharge nozzle 8 ,.
  • the position of the flow-influencing means 10 for - here spiral-shaped - housing 2 of the centrifugal pump 1 can be seen.
  • the flow-influencing means 10 can be arranged at a plurality of positions within the blade-less space 7. In tests various positions of flow-influencing agents were tested with rupture agents.
  • Fig. 4 shows a position in which the flow-influencing means 10 is arranged in a first spiral half 41 of the volute casing of the centrifugal pump 1. Due to the attachment locations 14, 15, 16 for fastening the suction-side housing cover 11, it is also possible to choose a twisted by 120 degrees attachment of the suction-side housing cover 11 on the centrifugal pump housing 2 with the same housing cover 11, whereby a slight adaptation to a pumped liquid, a Installation position and / or an operating point of the centrifugal pump takes place.
  • the flow-influencing means illustrated in the exemplary embodiments is to be understood as a flow-influencing means of exemplary shape.
  • Other one- or multi-part shapes of the flow-influencing agent also use the invention.
  • the invention is not limited to centrifugal pumps with a spiral housing, but is nevertheless used in centrifugal pumps with a ring housing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung betrifft eine Kreiselpumpe, mit in einem Gehäuse rotierend angeordneten Freistromlaufrad, wobei zwischen einer saugseitigen Gehäusewand und dem Freistromlaufrad ein schaufelloser Raum angeordnet ist und die Kreiselpumpe mit einer Einrichtung zur Vermeidung des Abreißens der Strömung versehen ist, wobei an der saugseitigen Gehäusewand mindestens ein, in den schaufellosen Raum vorstehendes, ein- oder mehrteiliges, strömungsbeeinflussendes Mittel angeordnet ist.The invention relates to a centrifugal pump, with a free-flow impeller mounted in a housing, wherein between a suction-side housing wall and the vortex impeller a blade-less space is arranged and the centrifugal pump is provided with a device for preventing the tearing of the flow, wherein at the suction-side housing wall at least one, in the blade-free space above, one or more parts, flow-influencing means is arranged.

Durch eine aufgrund von allgemeinen Wassereinsparungen bedingte Reduktion der Abwässer und gleichzeitig einer zunehmenden Anreicherung der Abwässer mit zu Verzopfungen neigenden Bestandteilen, Lappen, Vliesstoffen oder ähnlichem, erhöht sich die Verstopfungsgefahr einer solchen Kreiselpumpe. Solch ein dickflüssigeres Abwasser führt durch Zopfbildungen der Feststoffe zum Stillstand der Kreiselpumpe und/oder zum Ausfall einer mit der Kreiselpumpe verbundenen Anlage.By due to general water savings related reduction of wastewater and at the same time an increasing accumulation of wastewater with tipping prone components, cloths, nonwovens or the like, the clogging of such a centrifugal pump increases. Such a more viscous sewage leads by Zopfbildungen of the solids to a standstill of the centrifugal pump and / or failure of a system connected to the centrifugal pump.

Zwar ist durch die DE 76 36 700 U eine Kreiselpumpe mit vertikaler Drehachse und einem offenen Laufrad bekannt, dessen Schaufeln einen relativ großen Abstand zur gegenüberliegenden, den Pumpeneinlauf aufweisenden Wand besitzen. Daran ist eine in Strömungsrichtung von innen nach außen verlaufende Rippe angeordnet. Sie bewirkt eine unsymmetrische Störung in der rotierenden Strömung und übernimmt die Funktion einer Leiteinrichtung, auf der spezifisch leichtere Feststoffe bzw. Gase wie auf einer schieben Ebene nach außen transportiert werden. Dazu besitzt die Rippe, ausgehend von der Gehäusewand, eine rampenförmige Übergangsfläche, die ein Verfangen von in der Förderflüssigkeit enthaltenen Faserstoffen verhindert. Zusätzlich entwickelt sich diese Leiteinrichtung spiralförmig von innen nach außen. Eine solche Ableiteinrichtung für Feststoffe ist aufgrund ihres speziellen Verlaufs und deren Erstreckung vom Pumpeneinlass zum Pumpenauslass aufwendig herzustellen. Versuche haben ergeben, dass eine solche Ableiteinrichtung bei dickflüssigeren Abwässern nicht funktioniert.Although it is through the DE 76 36 700 U a centrifugal pump with a vertical axis of rotation and an open impeller known whose blades have a relatively large distance to the opposite, the pump inlet having wall. It is arranged in the direction of flow from the inside to the outside rib. It causes an asymmetrical disturbance in the rotating flow and takes over the function of a guide on which specific lighter solids or gases are transported as on a sliding plane to the outside. For this purpose, has the rib, starting from the housing wall, a ramp-shaped transition surface, a catching of in prevents the conveyed liquid contained fibers. In addition, this guide spirally develops from the inside to the outside. Such a discharge device for solids is complicated to produce due to their special course and their extension from the pump inlet to the pump outlet. Tests have shown that such a discharge device does not work for thicker wastewaters.

Bei der Kreiselpumpe der EP 1 840 379 A2 zwingt ein strömungsbeeinflussendes Mittel an der saugseitigen Gehäusewand die Förderflüssigkeit im schaufellosen Raum zwischen saugseitiger Gehäusewand und den Laufradschaufeln auf einen sich an das Laufrad annähernden Strömungspfad. Durch die erzwungene lokale Annäherung an das Laufrad verwirbelt dieses eine mögliche Anlagerung von Gasen in Räumen niedrigen Drucks und verhindert die Bildung unerwünschter Gasansammlungen. Ein Abreißen der Strömung wird dadurch verhindert.At the centrifugal pump of EP 1 840 379 A2 a flow-influencing agent on the suction-side housing wall forces the delivery fluid in the space without blades between the suction-side housing wall and the impeller blades onto a flow path approaching the impeller. By forced local approach to the impeller, this swirls a possible accumulation of gases in rooms of low pressure and prevents the formation of unwanted gas accumulations. A tearing off of the flow is thereby prevented.

Die DE 14 53 735 A1 zeigt eine Kreiselradpumpe zum Fördern eines Gemisches von Flüssigkeiten und Feststoffen. Gegenüber den Schaufelkanten des Laufrades sind an der saugseitigen Gehäusewand Leitvorrichtungen angeordnet. Durch die Anordnung von Lauf- und Leiträdern werden hydraulisch günstige Strömungsverhältnisse erreicht, die ein Festsetzen von Beimischungen erschwert.The DE 14 53 735 A1 shows a centrifugal pump for conveying a mixture of liquids and solids. Opposite the blade edges of the impeller guide devices are arranged on the suction-side housing wall. The arrangement of running and guide wheels hydraulically favorable flow conditions are achieved, which makes it difficult to set admixtures.

Der Erfindung liegt das Problem zu Grunde, eine Kreiselpumpe mit besseren Fördereigenschaften bei Fördermedien mit zur Verstopfung neigenden Bestandteilen zu schaffen.The invention is based on the problem of providing a centrifugal pump with better conveying properties in the case of pumped media with constituents which tend to block.

Die Lösung dieses Problems sieht vor, dass das strömungsbeeinflussende Mittel mit mindestens einem Reißmittel versehen ist, wobei das strömungsbeeinflussende Mittel mit scharfen Kanten und/oder spitzen Reißzähnen versehen ist. Durch ein solches strömungsbeeinflussendes Mittel werden zu Verzopfungen neigende Förderbestandteile auf ihrem Weg vom Pumpeneinlass durch das Pumpengehäuse beim Passieren des strömungsbeeinflussenden Mittels oder beim Vorbeistreifen an demselben zerrissen. Selbst wenn sich größere, zu Verzopfungen neigende Förderbestandteile vor das Laufrad legen, wie dies zum Beispiel bei Lappen oder Vliesstoffen der Fall ist, werden solche Förderbestandteile aufgrund der Rotation und dem dadurch bedingten wiederkehrenden Anstreifen am strömungsbeeinflussenden Mittel in kurzer Zeit zerrissen. Eine Zopfbildung wird somit in einfacher Weise verhindert und abgerissene Teile werden problemlos durch den Pumpenauslass oder Druckstutzen gefördert. Somit wird bereits bei dem ersten Aufkommen einer Zopfbildung durch die Reißwirkung dessen weiterer Aufbau verhindert und einem dadurch bedingten Pumpenausfall entgegengewirkt. Eine weitere Ausgestaltung, wonach das strömungsbeeinflussende Mittel mit gehärteten Kanten versehen ist, verbessert die Wirkung und erhöht die Langzeitbeständigkeit.The solution to this problem provides that the flow-influencing means is provided with at least one rupture means, wherein the flow-influencing means is provided with sharp edges and / or sharp fangs. By such a flow-influencing means tearing-prone conveyance components are torn on their way from the pump inlet through the pump housing when passing the flow-influencing means or while sweeping past the same. Even if larger, tipping-prone conveyor components lay in front of the impeller, as is the case with rags or nonwovens, for example Such conveyor components due to the rotation and the consequent recurring rubbing the flow-influencing means in a short time torn. A pigtail is thus prevented in a simple manner and torn parts are easily promoted by the pump outlet or discharge nozzle. Thus, the further development of a pigtail formation is prevented by the ripping effect and counteracts a resulting pump failure due to the ripping effect. A further embodiment, according to which the flow-influencing agent is provided with hardened edges, improves the effect and increases the long-term stability.

Als vorteilhaft hat es sich erwiesen, dass das strömungsbeeinflussende Mittel im Bereich einer Saugöffnung bogenförmig auf einem Teilumfang als in Umfangsrichtung verlaufende Rippe angeordnet ist. Durch eine solche Rippe wird eine Fördercharakteristik einer Kreiselpumpe in nur geringem Maße geändert und es steht dennoch ein wirksames Mittel zum Zerreißen von festen zu Verzopfungen neigenden Förderbestandteilen zur Verfügung.It has proved to be advantageous that the flow-influencing means is arranged in the region of a suction opening in an arcuate manner on a partial circumference as a rib extending in the circumferential direction. By such a rib, a conveying characteristic of a centrifugal pump is changed to only a small extent and there is still an effective means for rupturing of fixed to clogging tipping conveyor components available.

Nach einer weiteren Ausgestaltung sind im Bereich der auf unterschiedlichen Durchmessern befindlichen und im schaufellosen Raum angeordneten Berührungslinien von aufeinander stehenden Rippenflächen ein oder mehrere Reißmittel angeordnet. Das strömungsbeeinflussende Mittel kann Reißmittel an seinem Innendurchmesser und/oder an seinem Außendurchmesser aufweisen. Diese können durch Materialwegnahme aus einem Rippenkörper, beispielsweise durch Fräsen, eingearbeitet sein. Eine beidseitige Anordnung von Reißmitteln an einer Rippe hat sich in Versuchen als besonders zweckmäßig erwiesen.According to a further embodiment, one or more tear means are arranged in the region of the contact lines of mutually different diameters and arranged in the blade-less space of mutually facing rib surfaces. The flow-influencing means may have tearing means at its inner diameter and / or at its outer diameter. These can be incorporated by material removal from a rib body, for example by milling. A two-sided arrangement of tear means on a rib has proven to be particularly useful in experiments.

Von Vorteil ist es, wenn das strömungsbeeinflussende Mittel Reißpunkte und/oder Reißstellen besitzt. Dabei können die Reißpunkte und/oder die Reißstellen durch im Winkel zueinander angeordnete Kanten gebildet sein. Somit sind die Randbereiche eines strömungsbeeinflussenden Mittels mit einer Verzahnung versehen. Es ergeben sich verschiedene Formen und Ausgestaltungen von Reißmitteln bzw. Reißzähnen wie beispielsweise spitze Reißzähne und/oder Reißzähne, die in ihrem äußeren Bereich durch eine Kante gebildet sind und dadurch abgeflacht verlaufen. Idealerweise besitzt ein strömungsbeeinflussendes Mittel eine Vielzahl von Reißpunkten und/oder Reißstellen.It is advantageous if the flow-influencing agent has tear points and / or tear points. The tear points and / or the tear points can be formed by edges arranged at an angle to one another. Thus, the edge regions of a flow-influencing means are provided with a toothing. There are various shapes and designs of tear or fangs such as pointed fangs and / or fangs, in its outer region are formed by an edge and thereby flattened. Ideally, a flow-influencing means has a plurality of tear points and / or tear points.

Von Vorteil ist es weiterhin, wenn die dem Laufrad zugekehrte Seite des strömungsbeeinflussenden Mittels eine plane Fläche bildet. Dadurch ergibt sich in einem mittleren Bereich des strömungsbeeinflussenden Mittels eine durchgehende Zone derart, dass ein Verfangen eines festen Förderbestandteiles, wie eines Lappens, verhindert wird.It is furthermore advantageous if the side of the flow-influencing means facing the impeller forms a planar surface. As a result, a continuous zone results in a central region of the flow-influencing means such that catching of a solid conveying component, such as a lobe, is prevented.

Eine andere Art der Ausgestaltung sieht vor, dass am strömungsbeeinflussenden Mittel Reißmittel angebracht sind, die in den schaufellosen Raum hineinragen. Dies können beispielsweise Stifte, Schneidplatten oder ähnliche Reißmittel sein, die beispielsweise durch Aufschrauben oder Aufklemmen mit dem strömungsbeeinflussenden Mittel befestigt sind.Another type of embodiment provides that the flow-influencing means are provided with means of removal, which protrude into the blade-less space. These may be, for example, pins, inserts or similar tear means, which are attached for example by screwing or clamping with the flow-influencing means.

In Versuchen wurde eine geeignete Position des strömungsbeeinflussenden Mittels mit Reißmitteln innerhalb eines Spiralgehäuses ermittelt. Dabei hat sich gezeigt, dass es zweckmäßig ist, wenn das strömungsbeeinflussende Mittel innerhalb eines Spiralgehäuses in einer ersten Spiralhälfte angeordnet ist.In experiments, a suitable position of the flow-influencing agent was determined with tear means within a spiral housing. It has been shown that it is expedient if the flow-influencing means is arranged within a spiral housing in a first spiral half.

Weiterhin ist es von Vorteil, wenn ein bogenförmig verlaufendes strömungsbeeinflussendes Mittel eine maximale Erstreckung entsprechend 180 Grad des Gehäuseumfanges aufweist. Neben der dadurch bedingten Materialersparnis ergibt sich eine gezielte Beeinflussung eines Förderstromes. Durch Anordnung von mehreren strömungsbeeinflussenden Mitteln kann deren Wirkung noch verstärkt werden.Furthermore, it is advantageous if an arc-shaped flow-influencing means has a maximum extension corresponding to 180 degrees of the housing circumference. In addition to the resulting material savings results in a targeted influencing a flow. By arranging several flow-influencing agents whose effect can be further enhanced.

Das strömungsbeeinflussende Mittel kann angeschrägte Konturenverläufe aufweisen. Solche Anschrägungen, die insbesondere an der strömungszugewandten Seite eines strömungsbeeinflussenden Mittels sinnvoll sind, verhindern ein Auflegen eines festen Förderbestandteils auf das strömungsbeeinflussende Mittel.The flow-influencing means may have tapered contour curves. Such chamfers, which are particularly useful on the flow-facing side of a flow-influencing agent prevent laying a solid delivery component on the flow-influencing means.

Die saugseitige Gehäusewand und das strömungsbeeinflussende Mittel können als Bestandteil eines Gehäusedeckels ausgebildet sein. Dies ermöglicht im Bedarfsfall eine Umrüstung einer bestehenden Freistrompumpe und einen schnellen und einfachen Austausch eines Gehäusedeckels. Somit kann eine Kreiselpumpe auch nachträglich einfach auf einen Betrieb mit zu Verzopfung neigenden Förderflüssigkeiten umgerüstet werden.The suction-side housing wall and the flow-influencing means may be formed as part of a housing cover. This allows, if necessary, a conversion of an existing free-flow pump and a quick and easy replacement of a housing cover. Thus, a centrifugal pump can also be retrofitted easily to an operation with tipping prone conveying fluids.

Dabei ist es zweckmäßig, dass das strömungsbeeinflussende Mittel lösbar befestigt ist. Es ergibt sich dadurch eine nachträgliche Anpassungsoption einer Kreiselpumpe mit verschiedenen strömungsbeeinflussenden Mitteln. Eine Kreiselpumpe kann also erst im Bedarfsfall mit einem strömungsbeinflussenden Mittel mit Reißmitteln ausgestattet werden. Dabei ist durch die lösbare Befestigung eine problemlose fallweise Anpassung an die jeweiligen Förderflüssigkeitszusammensetzungen gegeben. Verschiedene Formen und/oder Einbaupositionen haben sich in praktischen Versuchen als erfolgreich erwiesen.It is expedient that the flow-influencing means is releasably secured. This results in a subsequent adaptation option of a centrifugal pump with different flow-influencing means. A centrifugal pump can therefore only be equipped with a flow-flowing means with tear means when needed. This is given by the releasable attachment a problem-free case by case adaptation to the respective Förderflüssigkeitszusammensetzungen. Various shapes and / or mounting positions have proven successful in practical experiments.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im Folgenden näher beschrieben.Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Es zeigen die

Fig. 1
eine erfindungsgemäße Kreiselpumpe mit Freistromrad und einem strömungsbeeinflussenden Mittel mit Reißmitteln an einer saugseitigen Gehäusewand, die
Fig. 2a, 2b
einen saugseitigen Gehäusedeckel mit einem strömungsbeeinflussenden Mittel mit einer Vielzahl von Reißmitteln, die
Fig. 3a bis 3e
das gleiche strömungsbeeinflussende Mittel in mehreren Ansichten und die
Fig. 4
die erfindungsgemäße Kreiselpumpe in einer Frontansicht.
It show the
Fig. 1
a centrifugal pump according to the invention with free-flow and a flow-influencing means with tear means on a suction-side housing wall, the
Fig. 2a, 2b
a suction-side housing cover with a flow-influencing means with a plurality of tear means, the
Fig. 3a to 3e
the same flow-influencing agent in several views and the
Fig. 4
the centrifugal pump according to the invention in a front view.

Die Fig. 1 zeigt eine Kreiselpumpe 1 zur Förderung einer mit zu Verzopfungen neigenden Förderbestandteilen durchsetzten Förderflüssigkeit. Die Kreiselpumpe 1 weist ein in einem Gehäuse 2 rotierend angeordnetes Freistromlaufrad 3 mit Laufradschaufeln 4 auf, welches mit einer Antriebswelle 5 verbunden ist. Zwischen einer saugseitigen Gehäusewand 6 und dem Freistromlaufrad 3 ist ein schaufelloser Raum 7 angeordnet. Die Kreiselpumpe 1 ist mit einem - hier nicht dargestellten - Druckstutzen an einer Rohrleitung anschließbar. Über eine Saugöffnung 9 strömt die Förderflüssigkeit der Pumpe zu und daran könnte auch eine - hier nicht dargestellte - Saugleitung angeschlossen werden. Den Laufradschaufeln 4 gegenüberliegend ist an der saugseitigen Gehäusewand 6 ein strömungsbeeinflussendes Mittel 10 angeordnet. Dabei wird in diesem Ausführungsbeispiel ein überwiegender Teil der saugseitigen Gehäusewand 6 durch einen abnehmbaren saugseitigen Gehäusedeckel 11 gebildet, mit dem das - hier einteilig ausgebildete - strömungsbeeinflussende Mittel 10 verbunden ist.The Fig. 1 shows a centrifugal pump 1 for the promotion of a with tipping prone conveyor components interspersed delivery fluid. The centrifugal pump 1 has a freely rotating impeller 3 arranged in a housing 2 with impeller blades 4, which is connected to a drive shaft 5. Between a suction-side housing wall 6 and the free-flow impeller 3, a blade-less space 7 is arranged. The centrifugal pump 1 is connected to a - not shown here - discharge nozzle to a pipeline. Via a suction opening 9, the pumped liquid flows to the pump and it could also be connected to a - not shown here - suction line. The impeller blades 4 opposite to the suction-side housing wall 6, a flow-influencing means 10 is arranged. In this case, a predominant part of the suction-side housing wall 6 is formed in this embodiment by a removable suction-side housing cover 11, with which the - here integrally formed - flow-influencing means 10 is connected.

Das strömungsbeeinflussende Mittel 10 ist hier mit mehreren Reißmitteln 21, 23 in Form von scharfen Kanten, Reißpunkten, Reißstellen, verschiedenartigen Aussparungen und/oder Hinterschneidungen versehen. Das strömungsbeeinflussende Mittel 10 und die Reißmittel 21, 23 können verschiedene Gestaltsformen aufweisen. Zu Verzopfungen neigende Förderbestandteile werden durch die Reißmittel 21, 23 im Betrieb der Kreiselpumpe 1 zerrissen und derart zerkleinert, dass eine Förderung derselben durch den Pumpenauslass oder Druckstutzen ermöglicht ist. Das strömungsbeeinflussende Mittel 10 bewirkt durch seine Anordnung an der saugseitigen Gehäusewand 6 eine lokale Verkleinerung des schaufellosen Raumes 7, wodurch sich an das rotierende Laufrad 3 anlegende feste Förderbestandteile, wie beispielsweise Lappen oder Vliesstoffe, wirksam zerrissen und zerkleinert werden. Verschiedene Anordnungen des strömungsbeinflussenden Mittels 10 mit seinen Reißmitteln 21, 23 sind vorgesehen. So kann ein gerades strömungsbeeinflussende Mittel 10, beispielsweise rein radial, in einem bestimmten Winkel gegenüber einer rein radialen Anordnung angestellten Lage oder bei einer gebogenen oder bogenförmigen Ausführung eines strömungsbeeinflussenden Mittels ringförmig angeordnet sein. Die Kreiselpumpe 1 kann die verschiedensten Einbaulagen aufweisen und ist nicht auf die hier dargestellte vertikale Variante beschränkt.The flow-influencing means 10 is here provided with a plurality of tear means 21, 23 in the form of sharp edges, tear points, tear points, various recesses and / or undercuts. The flow-influencing means 10 and the tear means 21, 23 may have different shapes. Feeding-prone conveying components are torn by the tearing means 21, 23 in operation of the centrifugal pump 1 and crushed such that a promotion of the same through the pump outlet or discharge nozzle is possible. The flow-influencing means 10 causes by its arrangement on the suction-side housing wall 6, a local reduction of the shovelless space 7, which are effectively torn and crushed to the rotating impeller 3 applying solid conveying components, such as cloths or nonwovens. Various arrangements of the flow-axis flowing means 10 with its tear means 21, 23 are provided. Thus, a straight flow-influencing means 10, for example purely radially, be arranged in a certain angle relative to a purely radial arrangement employed position or in a bent or arcuate execution of a flow-influencing means annular. The Centrifugal pump 1 may have a variety of installation positions and is not limited to the vertical variant shown here.

Die Fig. 2a und 2b zeigen einen saugseitigen Gehäusedeckel 11 einer Kreiselpumpe in zwei perspektivischen Ansichten. Der saugseitige Gehäusedeckel 11 besitzt eine Saugöffnung 9 und drei Befestigungsorte 14, 15, 16 zur Befestigung des saugseitigen Gehäusedeckels 11 am Gehäuse 2 der Kreiselpumpe 1. An dem saugseitigen Gehäusedeckel 11 ist als strömungsbeeinflussendes Mittel 10 eine im Bereich der Saugöffnung 9 bogenförmig auf einem Teilumfang als in Umfangsrichtung verlaufende Rippe angeordnet, wobei im Bereich der auf unterschiedlichen Durchmessern befindlichen und im schaufellosen Raum angeordneten Berührungslinien von aufeinander stehenden Rippenflächen mehrere Reißmittel 21, 23 angeordnet sind. Die Reißmitteln 21 sind auf einer inneren Seite 22 oder am Innendurchmesser des strömungsbeeinflussenden Mittels 10 und die Reißmitteln 23 sind auf einer äußeren Seite 24 oder am Außendurchmesser des strömungsbeeinflussenden Mittels 10 ausgebildet.The Fig. 2a and 2b show a suction-side housing cover 11 of a centrifugal pump in two perspective views. The suction-side housing cover 11 has a suction opening 9 and three attachment locations 14, 15, 16 for attachment of the suction-side housing cover 11 on the housing 2 of the centrifugal pump 1. On the suction-side housing cover 11 is a strömungsbeeinflussendes means 10 in the region of the suction opening 9 arcuate on a partial circumference than arranged in the circumferential direction rib, wherein a plurality of tear means 21, 23 are arranged in the region of located on different diameters and arranged in the blade-less space lines of contact of mutually facing rib surfaces. The tearing means 21 are on an inner side 22 or on the inner diameter of the flow-influencing means 10 and the tearing means 23 are formed on an outer side 24 or on the outer diameter of the flow-influencing means 10.

Durch ein solches ringförmig verlaufendes strömungsbeeinflussendes Mittel wird eine gute Reißwirkung bei gleichzeitig nicht zu großer Beeinflussung einer Fördercharakteristik einer Kreiselpumpe erzielt. Das strömungsbeeinflussende Mittel 10 weist eine Vielzahl von Reißpunkten 26 und/oder Reißstellen auf. Dabei sind die Reißpunkte 26 durch im Winkel zueinander angeordnete Kanten 28 gebildet, wodurch sich spitze Reißzähne 30 am Innendurchmesser sowie spitze Reißzähne 31 am Außendurchmesser ergeben. Im eingebauten Zustand weist die dem Laufrad 3 zugekehrte Seite des strömungsbeeinflussenden Mittels 10 eine plane Fläche 32 auf. Dadurch ergibt sich zwischen den Reißzähnen 30 im Bereich des Innendurchmessers und den Reißzähnen 31 im Bereich des Außendurchmessers eine durchgehende Zone derart, dass ein Verfangen von festen Förderbestandteilen verhindert wird. Die Erfindung ist allerdings nicht auf ein solches Ausführungsbeispiel beschränkt, sondern es ist beispielsweise vorgesehen, dass am strömungsbeeinflussenden Mittel Reißmittel angebracht sind, die noch weiter in den schaufellosen Raum hineinragen können.By means of such an annular flow-influencing agent, a good ripping effect is achieved while at the same time not too great influencing a conveying characteristic of a centrifugal pump. The flow-influencing means 10 has a plurality of tear points 26 and / or tear points. In this case, the tear points 26 are formed by edges 28 arranged at an angle to each other, resulting in pointed fangs 30 on the inner diameter and pointed fangs 31 on the outer diameter. In the installed state, the impeller 3 facing side of the flow-influencing means 10 has a flat surface 32. This results in a continuous zone between the fangs 30 in the region of the inner diameter and the fangs 31 in the region of the outer diameter such that a catching of solid conveying components is prevented. However, the invention is not limited to such an embodiment, but it is provided, for example, that the flow-influencing means are provided with tear means that can protrude further into the blade-less space.

Die Figuren 3a bis 3e zeigen das strömungsbeeinflussende Mittel 10 in mehreren Ansichten. Es zeigt die Fig. 3a eine Unteransicht des strömungsbeeinflussenden Mittels 10. Das strömungsbeeinflussende Mittel 10 weist zwei Befestigungslöcher 33, 34 zur Befestigung an einem Gehäusedeckel auf. Somit kann auf einfache Art und Weise ein Gehäusedeckel nachträglich mit einem strömungsbeeinflussenden Mittel mit Reißmitteln ausgestattet werden bzw. nachgerüstet werden.The FIGS. 3a to 3e show the flow-influencing means 10 in several views. It shows the Fig. 3a a bottom view of the flow-influencing means 10. The flow-influencing means 10 has two mounting holes 33, 34 for attachment to a housing cover. Thus, in a simple manner, a housing cover can be retrofitted with a flow-influencing agent with tear means or retrofitted.

Fig. 3b zeigt eine Frontansicht des strömungsbeeinflussenden Mittels 10. Das strömungsbeeinflussende Mittel 10 weist an einem Ende angeschrägte Konturenverläufe auf. Es besitzt einen angeschrägten Konturenverlauf 35 und einen angeschrägten Konturenverlauf 36, der sich aus einer in Umfangsrichtung größer werdenden axialen Erstreckung des strömungsbeeinflussenden Mittels ergibt. Fig. 3b shows a front view of the flow-influencing means 10. The flow-influencing means 10 has at one end beveled contour curves. It has a bevelled contour profile 35 and a bevelled contour curve 36, which results from a circumferentially increasing axial extent of the flow-influencing agent.

Fig. 3c zeigt das strömungsbeeinflussende Mittel 10 in dessen Draufsicht. Hier sind wiederum die am Innendurchmesser entstehenden oder gebildeten Reißzähne 30 und die am Außendurchmesser gebildeten Reißzähne 31 erkennbar. In einem mittleren Bereich zwischen den Reißzähnen 30, 31 am Innendurchmesser bzw. am Außendurchmesser ergibt sich eine über die gesamte Erstreckung des strömungsbeeinflussenden Mittels 10 sich erstreckende plane Fläche 32. Im montierten Zustand ist diese Seite des strömungsbeeinflussenden Mittels 10 dem Laufrad 3 zugekehrt. Durch diese ebene Zone 32 wird ein Verfangen von festen Förderbestandteilen, wie Lappen oder Vliesstoffen, verhindert. Fig. 3c shows the flow-influencing means 10 in its plan view. Here again, the fangs 30 formed or formed on the inner diameter and the fangs 31 formed on the outer diameter are recognizable. In a middle region between the fangs 30, 31 at the inner diameter or at the outer diameter results in a over the entire extent of the flow-influencing agent 10 extending flat surface 32. In the assembled state, this side of the flow-influencing means 10 faces the impeller 3. This flat zone 32 prevents entanglement of solid conveying components, such as cloths or nonwovens.

Fig. 3d und Fig. 3e zeigen zwei Schnitte durch das strömungsbeeinflussende Mittel 10. Fig. 3d and Fig. 3e show two sections through the flow-influencing means 10th

Fig. 4 zeigt die Kreiselpumpe 1 in einer Frontansicht, wobei in der Darstellung ein ausgeschnittener Bereich um das strömungsbeeinflussende Mittel 10 am Gehäusedeckel 11 vorhanden ist, um die Lage des strömungsbeeinflussenden Mittels 10 innerhalb des Pumpengehäuses 2 mit seinem Druckstutzen 8, zu zeigen. Es ist insbesondere die Lage des strömungsbeeinflussenden Mittels 10 zum - hier spiralförmig gestalteten - Gehäuse 2 der Kreiselpumpe 1 ersichtlich. Fig. 4 shows the centrifugal pump 1 in a front view, in the illustration a cut-out area around the flow-influencing means 10 on the housing cover 11 is present to show the position of the flow-influencing means 10 within the pump housing 2 with its discharge nozzle 8 ,. In particular, the position of the flow-influencing means 10 for - here spiral-shaped - housing 2 of the centrifugal pump 1 can be seen.

Erfindungsgemäß ist es vorgesehen, dass das strömungsbeeinflussende Mittel 10 an mehreren Positionen innerhalb des schaufellosen Raumes 7 angeordnet sein kann. In Versuchen wurden verschiedene Positionen von strömungsbeeinflussenden Mitteln mit Reißmitteln erprobt. Fig. 4 zeigt eine Position, bei der das strömungsbeeinflussende Mittel 10 in einer ersten Spiralhälfte 41 des Spiralgehäuses der Kreiselpumpe 1 angeordnet ist. Durch die Befestigungsorte 14, 15, 16 zur Befestigung des saugseitigen Gehäusedeckels 11 ist es ebenfalls möglich, eine um jeweils 120 Grad gedrehte Befestigung des saugseitigen Gehäusedeckels 11 am Kreiselpumpengehäuse 2 mit dem selben Gehäusedeckel 11 zu wählen, wodurch eine leichte Anpassung an eine Förderflüssigkeit, eine Einbaulage und/oder einem Betriebspunkt der Kreiselpumpe erfolgt.According to the invention, it is provided that the flow-influencing means 10 can be arranged at a plurality of positions within the blade-less space 7. In tests various positions of flow-influencing agents were tested with rupture agents. Fig. 4 shows a position in which the flow-influencing means 10 is arranged in a first spiral half 41 of the volute casing of the centrifugal pump 1. Due to the attachment locations 14, 15, 16 for fastening the suction-side housing cover 11, it is also possible to choose a twisted by 120 degrees attachment of the suction-side housing cover 11 on the centrifugal pump housing 2 with the same housing cover 11, whereby a slight adaptation to a pumped liquid, a Installation position and / or an operating point of the centrifugal pump takes place.

Das in den Ausführungsbeispielen dargestellte strömungsbeeinflussende Mittel ist als ein strömungsbeeinflussendes Mittel exemplarischer Gestalt zu verstehen. Andere ein- oder mehrteilige Gestaltsformen des strömungsbeeinflussenden Mittels nutzen ebenfalls die Erfindung.The flow-influencing means illustrated in the exemplary embodiments is to be understood as a flow-influencing means of exemplary shape. Other one- or multi-part shapes of the flow-influencing agent also use the invention.

Ebenso ist die Erfindung nicht auf Kreiselpumpen mit einem Spiralgehäuse beschränkt, sondern wird gleichwohl bei Kreiselpumpen mit einem Ringgehäuse genutzt.Likewise, the invention is not limited to centrifugal pumps with a spiral housing, but is nevertheless used in centrifugal pumps with a ring housing.

Claims (12)

  1. Centrifugal pump (1) with a non-chokable impeller (3) which is rotatably arranged in a housing (2), wherein a bladeless space (7) is arranged between a suction-side housing wall (6) and the non-chokable impeller (3), and the centrifugal pump (1) is provided with a device for avoiding breakaway of the flow, wherein at least one one-piece or multi-piece flow-influencing means (10), which projects into the bladeless space (7), is arranged on the suction-side housing wall (6), characterized in that the flow-influencing means (10) is provided with at least one shredding means (21, 23),wherein the flow-influencing means (10) is provided with sharp edges and/or pointed shredding teeth (30, 31).
  2. Centrifugal pump according to Claim 1, characterized in that the flow-influencing means (10), as a rib which extends in the circumferential direction, is arranged in the region of a suction port (9) in an arc-shaped manner on a partial circumference.
  3. Centrifugal pump according to Claim 2, characterized in that one or more shredding means (21, 23) are arranged in the region of the contact lines of rib surfaces which are perpendicular to each other, the contact lines being located on different diameters and arranged in the bladeless space.
  4. Centrifugal pump according to Claims 1 to 3, characterized in that the flow-influencing means (10) has shredding points (26) and/or shredding positions.
  5. Centrifugal pump according to Claim 4, characterized in that the shredding points (26) and/or shredding positions are formed by edges (28) which are arranged at an angle to each other.
  6. Centrifugal pump according to one of Claims 1 to 5, characterized in that the side of the flow-influencing means (10) which faces the impeller (3) forms a planar surface (32).
  7. Centrifugal pump according to one of Claims 1 to 6, characterized in that shredding means are attached on the flow-influencing means (10) and project into the bladeless space (7).
  8. Centrifugal pump according to one of Claims 1 to 7, characterized in that the flow-influencing means (10) is arranged inside a spiral housing in a first spiral half (41).
  9. Centrifugal pump according to one of Claims 1 to 8, characterized in that the flow-influencing means (10) has a maximum extent which corresponds to 180° of the housing circumference.
  10. Centrifugal pump according to one of Claims 1 to 9, characterized in that the flow-influencing means (10) has bevelled contour progressions (35, 36).
  11. Centrifugal pump according to one of Claims 1 to 10, characterized in that the suction-side housing wall (6) and the flow-influencing means (10) are formed as a component part of a housing cover (11).
  12. Centrifugal pump according to one of Claims 1 to 11, characterized in that the flow-influencing means (10) is fastened in a detachable manner.
EP09007443.6A 2008-06-27 2009-06-05 Centrifugal pump with free flow wheel Active EP2138723B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008030112A DE102008030112A1 (en) 2008-06-27 2008-06-27 Centrifugal pump with free-flow impeller

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EP2138723A2 EP2138723A2 (en) 2009-12-30
EP2138723A3 EP2138723A3 (en) 2010-07-28
EP2138723B1 true EP2138723B1 (en) 2017-09-13

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EP (1) EP2138723B1 (en)
CN (1) CN101614209B (en)
DE (1) DE102008030112A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8998582B2 (en) * 2010-11-15 2015-04-07 Sundyne, Llc Flow vector control for high speed centrifugal pumps
DE102015212654B4 (en) * 2015-07-07 2021-10-21 BSH Hausgeräte GmbH HOUSEHOLD APPLIANCE
DE102019004263A1 (en) * 2019-06-18 2020-12-24 KSB SE & Co. KGaA Centrifugal pump and method for detecting the status of a centrifugal pump

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Publication number Priority date Publication date Assignee Title
DE1453735A1 (en) 1962-06-01 1969-01-23 Eta Corp Turbo resp. Centrifugal pump
DE1453738A1 (en) * 1963-01-28 1969-01-30 Eisele Soehne Franz Cutting unit for liquid manure pumps
DE1528651B2 (en) * 1965-01-23 1975-12-18 Albert 5204 Lohmar Blum Dirty water pump
DE7636700U1 (en) 1976-11-22 1977-10-06 Klein, Schanzlin & Becker Ag, 6710 Frankenthal CENTRIFUGAL PUMP WITH AN OPEN IMPELLER
DE2714376C3 (en) * 1977-03-31 1980-08-28 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Centrifugal pump with an open impeller
SE525412C2 (en) * 2003-10-20 2005-02-15 Itt Mfg Enterprises Inc Centrifugal pump for contaminated liquids, comprises wheel with scoops and cover plates with spiral grooves around casing inlet
DE202006005073U1 (en) 2006-03-28 2006-06-08 Ksb Aktiengesellschaft Centrifugal pump with free-flow impeller

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Title
None *

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Publication number Publication date
CN101614209B (en) 2014-12-10
EP2138723A2 (en) 2009-12-30
DE102008030112A1 (en) 2009-12-31
EP2138723A3 (en) 2010-07-28
CN101614209A (en) 2009-12-30

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