EP1185795B1 - Balancer for multistage centrifugal pumps - Google Patents

Balancer for multistage centrifugal pumps Download PDF

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Publication number
EP1185795B1
EP1185795B1 EP00941982A EP00941982A EP1185795B1 EP 1185795 B1 EP1185795 B1 EP 1185795B1 EP 00941982 A EP00941982 A EP 00941982A EP 00941982 A EP00941982 A EP 00941982A EP 1185795 B1 EP1185795 B1 EP 1185795B1
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EP
European Patent Office
Prior art keywords
axial
thrust
gap
relieving
centrifugal pump
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00941982A
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German (de)
French (fr)
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EP1185795A1 (en
Inventor
Baogang Wang
Bernhard Brecht
Jürgen Schill
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KSB AG
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KSB AG
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Publication of EP1185795A1 publication Critical patent/EP1185795A1/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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F04D29/0416—Axial thrust balancing balancing pistons

Definitions

  • the invention relates to a device for receiving the axial thrust of a Multi-stage centrifugal pump, with a relief device, which one or has multiple axial column and one or more radial gaps and at which is guided over the column a discharge current, and with a the remaining residual thrust receiving thrust bearing, the thrust bearing a assigned to the compensation of misalignment serving gimbal ring is.
  • a relief device which one or has multiple axial column and one or more radial gaps and at which is guided over the column a discharge current, and with a the remaining residual thrust receiving thrust bearing, the thrust bearing a assigned to the compensation of misalignment serving gimbal ring is.
  • the resulting respectively by the discharge current gap losses are in the three versions of different heights. So, above all, has the simple Relief piston surrounding radial gap a large gap current and thus a high efficiency drop of the centrifugal pump result.
  • the gap loss a stepped piston relief device, which - depending on the number of stages - on at least two radial gaps and one each between the radial gaps arranged axial gap has, however, is already much lower. Common to the two working with piston designs that they still need a thrust bearing, which receives a remaining residual thrust.
  • the version with relief disc needs such a thrust bearing basically not, since the relief disc acts self-regulating. Since the this essential axial gap between relief disc and not rotating counter-disc sets very tight, also the leakage of this remains Version relatively small. However, it can be used with centrifugal pumps high end pressures and high performance in transient driving style to a Slip the relief disc come on the opposite disc. But that is the reliability of such pumps no longer guaranteed.
  • the invention has for its object to provide a relief device which has minimal leakage with high reliability.
  • the relief device is designed so that In all operating conditions, a residual thrust results in the direction of the suction side the centrifugal pump acts, and that the gimbal ring is dimensioned so that he is elastically deformed by the residual thrust, wherein the spring constant of the Kardanic ring has such a characteristic that, starting from a maximum gap width at rest of the centrifugal pump, the axial gap under operating conditions to a minimum width, at which a Touch the axial gap limiting surfaces is still avoided.
  • the relief device a stepped piston with multiple axial Columns, the said condition applies to all axial column.
  • the invention is not only in relief with double piston or multi-stage piston use. It can also be used with relief discs be applied. Although caused an additional thrust bearing with gimbal Ring in a device with relief disc an increased effort. There but thus the reliability of centrifugal pumps with high end pressures and to ensure great performance even with transient driving is at least there justified the effort.
  • the invention is primarily in cooperation with a hydrodynamic Thrust bearing can be used with advantage.
  • the double piston 4 is an inventive Relief device attached on the shaft 2, moreover, the double piston 4 is an inventive Relief device attached.
  • the double piston 4 is surrounded by a Housing part 5, with which it forms two radial gaps 6 and 7. Between radial gaps 6 and 7 is an axial gap 8.
  • the axial gap 8 has a variable width s.
  • the thrust bearing 9 is a gimbal Ring 10 assigned.
  • the gimbal 10 initially serves in a known manner To compensate for misalignment, when mounting a multi-stage Centrifugal pump are inevitable. But it is new that the gimbal ring 10 so is dimensioned that it by the residual thrust occurring in the centrifugal pump is elastically deformed.
  • the spring constant of the gimbal ring is 10 adapted to the other conditions of the discharge device:
  • the relief device is designed so that in all operating conditions the centrifugal pump gives a residual thrust, which acts in the direction of the suction side.
  • the centrifugal pump is now characterized by an elastic deformation of the gimbal Ringes 10 of the gap 8 under operating conditions to a predetermined Minimum width closed, in which a touch of the gap. 8 delimiting surfaces of the double piston 4 and the housing part 5 still is avoided.
  • the relief device according to the invention Assume that the axial gap 8 has a self-regulating function, as in Similarly, in a relief disc is the case.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A balancing arrangement which is used to relieve or take up axial thrust in a multistage centrifugal pump, having a balancing device with at least one axial gap (8) and at least one radial gap (6,7) and in which a balancing flow is conducted through the gaps, and having an axial bearing which receives remaining axial thrust. Associated with the axial bearing is a cardanic ring (10) which serves to offset alignment errors. Highly reliable operation with only low leakage losses is achieved by configuring the balancing device such that a residual thrust in the direction of the suction side of the pump exists in all operating conditons and the cardanic ring is designed such that it is elastically deformed by the residual thrust and has a spring constant such that the axial gap (s) will close from a maximum width position when the pump is at rest to a minimum width position during operation while still avoiding contact between the surfaces which define the axial gap.

Description

Die Erfindung betrifft eine Einrichtung zur Aufnahme des Axialschubes einer mehrstufigen Kreiselpumpe, mit einer Entlastungseinrichtung, welche einen oder mehrere axiale Spalte und einen oder mehrere radiale Spalte besitzt und bei welcher über die Spalte ein Entlastungsstrom geführt wird, und mit einem den verbleibenden Restschub aufnehmenden Axiallager, wobei dem Axiallager ein dem Ausgleich von Fluchtungsfehlern dienender kardanischer Ring zugeordnet ist. Eine derartige Einrichtung ist z.B. aus der Patentschrift DE 886 250 A bekannt.The invention relates to a device for receiving the axial thrust of a Multi-stage centrifugal pump, with a relief device, which one or has multiple axial column and one or more radial gaps and at which is guided over the column a discharge current, and with a the remaining residual thrust receiving thrust bearing, the thrust bearing a assigned to the compensation of misalignment serving gimbal ring is. Such a device is e.g. known from the patent DE 886 250 A.

Zur Aufnahme des Axialschubes bei mehrstufigen Kreiselpumpen sind im wesentlichen drei verschiedene Arten von Entlastungseinrichtungen bekannt: Entlastungsscheibe, Entlastungskolben und Stufenkolben. Letzterer ist in der überwiegend gebrauchten Form als Doppelkolben ausgebildet. Die genannten Einrichtungen werden in dem KSB-Kreiselpumpenlexikon, 3. Auflage, 1989, unter dem Stichwort "Axialschub" beschrieben.To accommodate the axial thrust in multi-stage centrifugal pumps are in essentially three different types of discharge facilities known: Relief disc, relief piston and stepped piston. The latter is in the predominantly used form designed as a double piston. The mentioned Facilities are in the KSB centrifugal pumps Lexikon, 3rd edition, 1989, under the keyword "axial thrust" described.

Allen drei Ausführungen gemeinsam ist ein über Spalte geführter Entlastungsstrom. Der meist zum Einlauf der Kreiselpumpe zurückgeführte Entlastungsstrom stellt einen Leckverlust dar, den man durch möglichst geringe Spaltweiten zu minimieren versucht. Dabei ist aber dafür Sorge zu tragen, daß unter allen Betriebsbedingungen ein Anstreifen der bewegten Teile an den stehenden Teilen der Kreiselpumpe möglichst vermieden wird. Ein Anstreifen des Pumpenläufers im Gehäuse kann zu einem Fressen an einander gegenüberliegenden Flächen und damit zum Ausfall der Kreiselpumpe führen.Common to all three embodiments is a discharge current carried over column. Most of the discharge to the inlet of the centrifugal pump discharge flow represents a leakage, which is due to the smallest possible gap widths tried to minimize. But it is important to ensure that among all Operating conditions a rubbing of the moving parts on the stationary parts the centrifugal pump is avoided if possible. A rubbing of the pump rotor in Housing may cause seizure on opposite surfaces and thus lead to failure of the centrifugal pump.

Die jeweils durch den Entlastungsstrom entstehenden Spaltverluste sind bei den drei Ausführungen unterschiedlich hoch. So hat vor allem der den einfachen Entlastungskolben umgebende radiale Spalt einen großen Spaltstrom und damit einen starken Wirkungsgradabfall der Kreiselpumpe zur Folge. Der Spaltverlust einer Stufenkolben-Entlastungseinrichtung, die - je nach Anzahl der Stufen - über mindestens zwei radiale Spalte und jeweils einen zwischen den radialen Spalten angeordneten axialen Spalt verfügt, ist dagegen schon wesentlich geringer. Gemeinsam ist den beiden mit Kolben arbeitenden Ausführungen, daß sie noch ein Axiallager benötigen, das einen verbleibenden Restschub aufnimmt.The resulting respectively by the discharge current gap losses are in the three versions of different heights. So, above all, has the simple Relief piston surrounding radial gap a large gap current and thus a high efficiency drop of the centrifugal pump result. The gap loss a stepped piston relief device, which - depending on the number of stages - on at least two radial gaps and one each between the radial gaps arranged axial gap has, however, is already much lower. Common to the two working with piston designs that they still need a thrust bearing, which receives a remaining residual thrust.

Die Ausführung mit Entlastungsscheibe braucht ein solches Axiallager grundsätzlich nicht, da die Entlastungsscheibe selbstregelnd wirkt. Da sich der hierbei wesentliche axiale Spalt zwischen Entlastungsscheibe und nicht rotierender Gegenscheibe sehr eng einstellt, bleibt auch der Leckverlust dieser Ausführung verhältnismäßig klein. Allerdings kann es bei Kreiselpumpen mit hohen Enddrücken und großen Leistungen bei transienter Fahrweise zu einem Anstreifen der Entlastungsscheibe an der Gegenscheibe kommen. Damit ist aber die Betriebssicherheit solcher Pumpen nicht mehr gewährleistet.The version with relief disc needs such a thrust bearing basically not, since the relief disc acts self-regulating. Since the this essential axial gap between relief disc and not rotating counter-disc sets very tight, also the leakage of this remains Version relatively small. However, it can be used with centrifugal pumps high end pressures and high performance in transient driving style to a Slip the relief disc come on the opposite disc. But that is the reliability of such pumps no longer guaranteed.

Der Erfindung liegt die Aufgabe zugrunde, eine Entlastungseinrichtung zu schaffen, die bei hoher Zuverlässigkeit nur minimale Leckverluste hat.The invention has for its object to provide a relief device which has minimal leakage with high reliability.

Ausgehend von einer Einrichtung der eingangs genannten Art wird die gestellte Aufgabe dadurch gelöst, daß die Entlastungseinrichtung so ausgelegt ist, daß sich in allen Betriebszuständen ein Restschub ergibt, der in Richtung der Saugseite der Kreiselpumpe wirkt, und daß der kardanische Ring so dimensioniert ist, daß er durch den Restschub elastisch verformt wird, wobei die Federkonstante des kardanischen Ringes eine solche Charakteristik besitzt, daß, ausgehend von einer maximalen Spaltweite im Ruhezustand der Kreiselpumpe, sich der axiale Spalt unter Betriebsbedingungen bis auf eine minimale Weite schließt, bei welcher eine Berührung der den axialen Spalt begrenzenden Flächen noch vermieden wird. Besitzt die Entlastungseinrichtung eine Stufenkolben mit mehreren axialen Spalten, gilt die genannte Bedingung für alle axialen Spalte.Starting from a device of the type mentioned is the asked Problem solved in that the relief device is designed so that In all operating conditions, a residual thrust results in the direction of the suction side the centrifugal pump acts, and that the gimbal ring is dimensioned so that he is elastically deformed by the residual thrust, wherein the spring constant of the Kardanic ring has such a characteristic that, starting from a maximum gap width at rest of the centrifugal pump, the axial gap under operating conditions to a minimum width, at which a Touch the axial gap limiting surfaces is still avoided. Does the relief device a stepped piston with multiple axial Columns, the said condition applies to all axial column.

Die Erfindung ist aber nicht nur bei Entlastungseinrichtungen mit Doppelkolben oder mehrstufigen Kolben einzusetzen. Sie kann ebenso bei Entlastungsscheiben angewandt werden. Zwar verursacht ein zusätzliches Axiallager mit kardanischem Ring bei einer Einrichtung mit Entlastungsscheibe einen erhöhten Aufwand. Da aber hierdurch die Betriebssicherheit bei Kreiselpumpen mit hohen Enddrücken und großen Leistungen auch bei transienter Fahrweise zu gewährleisten ist, ist zumindest dort der Aufwand gerechtfertigt.However, the invention is not only in relief with double piston or multi-stage piston use. It can also be used with relief discs be applied. Although caused an additional thrust bearing with gimbal Ring in a device with relief disc an increased effort. There but thus the reliability of centrifugal pumps with high end pressures and to ensure great performance even with transient driving is at least there justified the effort.

Die Erfindung ist vor allem im Zusammenwirken mit einem hydrodynamischen Axiallager mit Vorteil anwendbar.The invention is primarily in cooperation with a hydrodynamic Thrust bearing can be used with advantage.

Anhand eines Ausführungsbeispiels wird die Erfindung näher erläutert. Die Zeichnung zeigt einen Ausschnitt aus einer im Schnitt dargestellten mehrstufigen Kreiselpumpe.Reference to an embodiment of the invention will be explained in more detail. The Drawing shows a section of a multilevel shown in section Centrifugal pump.

In dem Gehäuse 1 der Kreiselpumpe ist eine Welle 2 gelagert, die mehrere Laufräder 3 trägt. In der Zeichnung sind nur zwei der Laufräder 3 erkennbar.In the housing 1 of the centrifugal pump, a shaft 2 is mounted, the more Wheels 3 carries. In the drawing, only two of the wheels 3 can be seen.

Auf der Welle 2 ist im übrigen der Doppelkolben 4 einer erfindungsgemäßen Entlastungseinrichtung befestigt. Der Doppelkolben 4 wird umgeben von einem Gehäuseteil 5, mit dem er zwei radiale Spalte 6 und 7 bildet. Zwischen den radialen Spalten 6 und 7 befindet sich ein axialer Spalt 8. Der axiale Spalt 8 hat eine veränderliche Weite s.On the shaft 2, moreover, the double piston 4 is an inventive Relief device attached. The double piston 4 is surrounded by a Housing part 5, with which it forms two radial gaps 6 and 7. Between radial gaps 6 and 7 is an axial gap 8. The axial gap 8 has a variable width s.

Am druckseitigen Ende der Kreiselpumpe wird die Welle 2 durch ein hydrodynamisches Axiallager 9 aufgenommen. Dem Axiallager 9 ist ein kardanischer Ring 10 zugeordnet. Der kardanische Ring 10 dient zunächst in bekannter Weise dem Ausgleich von Fluchtungsfehlern, die bei der Montage einer mehrstufigen Kreiselpumpe unvermeidlich sind. Neu ist aber, daß der kardanische Ring 10 so dimensioniert ist, daß er durch den in der Kreiselpumpe auftretenden Restschub elastisch verformt wird. Dabei ist die Federkonstante des kardanischen Ringes 10 an die übrigen Gegebenheiten der Entlastungseinrichtung angepaßt:At the pressure-side end of the centrifugal pump, the shaft 2 by a hydrodynamic Axial bearing 9 was added. The thrust bearing 9 is a gimbal Ring 10 assigned. The gimbal 10 initially serves in a known manner To compensate for misalignment, when mounting a multi-stage Centrifugal pump are inevitable. But it is new that the gimbal ring 10 so is dimensioned that it by the residual thrust occurring in the centrifugal pump is elastically deformed. The spring constant of the gimbal ring is 10 adapted to the other conditions of the discharge device:

Die Entlastungseinrichtung ist so ausgelegt, daß sich in allen Betriebszuständen der Kreiselpumpe ein Restschub ergibt, der in Richtung der Saugseite wirkt. Ausgehend von einer maximalen Weite s des axialen Spaltes 8 im Ruhezustand der Kreiselpumpe wird nun durch eine elastische Verformung des kardanischen Ringes 10 der Spalt 8 unter Betriebsbedingungen bis auf eine vorgegebene Minimalweite geschlossen, bei welcher eine Berührung der den Spalt 8 begrenzenden Flächen des Doppelkolbens 4 und des Gehäuseteils 5 noch vermieden wird. Dabei kommt der erfindungsgemäßen Entlastungseinrichtung zustatten, daß der axiale Spalt 8 eine selbstregelnde Funktion besitzt, so wie es in ähnlicher Weise bei einer Entlastungsscheibe der Fall ist.The relief device is designed so that in all operating conditions the centrifugal pump gives a residual thrust, which acts in the direction of the suction side. Starting from a maximum width s of the axial gap 8 at rest the centrifugal pump is now characterized by an elastic deformation of the gimbal Ringes 10 of the gap 8 under operating conditions to a predetermined Minimum width closed, in which a touch of the gap. 8 delimiting surfaces of the double piston 4 and the housing part 5 still is avoided. Here comes the relief device according to the invention Assume that the axial gap 8 has a self-regulating function, as in Similarly, in a relief disc is the case.

Claims (6)

  1. Device for absorbing the axial thrust of a multistage centrifugal pump, with a relieving device which possesses an axial gap (8) and one or more radial gaps (6, 7) and in which a relieving stream is led via the gaps (6, 7, 8), and with an axial bearing (9) absorbing the remaining residual thrust, the axial bearing (9) being assigned a cardanic ring (10) serving for the compensation of errors of alignment, characterized in that the relieving device is designed in such a way that, in all the operating states, a residual thrust occurs which acts in the direction of the suction side of the centrifugal pump, and in that the cardanic ring (10) is dimensioned in such a way that it is deformed elastically by the residual thrust, the spring constant of the cardanic ring (10) possessing a characteristic such that, starting from a maximum gap width (s) in the state of rest of the centrifugal pump, the axial gap (8) closes under operating conditions to a minimum width at which contact between the faces delimiting the axial gap (8) is still avoided.
  2. Device for absorbing the axial thrust of a multistage centrifugal pump, with a relieving device which possesses a plurality of axial and radial gaps (6, 7, 8) and in which a relieving stream is led via the gaps (6, 7, 8), and with an axial bearing (9) absorbing the remaining residual thrust, the axial bearing (9) being assigned a cardanic ring (10) serving for the compensation of errors of alignment, characterized in that the relieving device is designed in such a way that, in all the operating states, a residual thrust occurs which acts in the direction of the suction side of the centrifugal pump, and in that the cardanic ring (10) is dimensioned in such a way that it is deformed elastically by the residual thrust, the spring constant of the cardanic ring (10) possessing a characteristic such that, starting from a maximum gap width (s) in the state of rest of the centrifugal pump, the axial gaps close under operating conditions to a minimum width at which contact between the faces delimiting the axial gaps is still avoided.
  3. Device according to Claim 1, characterized in that the relieving device is formed by a double piston (4) with an axial gap (8) located between the two piston parts.
  4. Device according to Claim 2, characterized in that the relieving device is formed by a stepped piston in each case with an axial gap located between two steps.
  5. Device according to Claim 1, characterized in that the relieving device is formed by a relieving disc which with a casing-side counterdisc forms an axial gap.
  6. Device according to one of Claims 1 to 5, characterized in that a hydrodynamic axial bearing (9) is used as an axial bearing.
EP00941982A 1999-06-15 2000-05-25 Balancer for multistage centrifugal pumps Expired - Lifetime EP1185795B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19927135A DE19927135A1 (en) 1999-06-15 1999-06-15 Relief device for multi-stage centrifugal pumps
DE19927135 1999-06-15
PCT/EP2000/004754 WO2000077405A1 (en) 1999-06-15 2000-05-25 Balancer for multistage centrifugal pumps

Publications (2)

Publication Number Publication Date
EP1185795A1 EP1185795A1 (en) 2002-03-13
EP1185795B1 true EP1185795B1 (en) 2003-07-30

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Application Number Title Priority Date Filing Date
EP00941982A Expired - Lifetime EP1185795B1 (en) 1999-06-15 2000-05-25 Balancer for multistage centrifugal pumps

Country Status (6)

Country Link
US (1) US6568901B2 (en)
EP (1) EP1185795B1 (en)
AT (1) ATE246318T1 (en)
BR (1) BR0011590A (en)
DE (2) DE19927135A1 (en)
WO (1) WO2000077405A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE102018210842A1 (en) 2018-07-02 2020-01-02 KSB SE & Co. KGaA Arrangement for receiving the axial thrust of a centrifugal pump

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DE50206223D1 (en) * 2001-10-22 2006-05-18 Sulzer Pumpen Ag Shaft sealing arrangement for a pump for conveying hot fluids
DE10254041B4 (en) * 2002-11-20 2011-07-07 KSB Aktiengesellschaft, 67227 Method and apparatus for early fault detection in centrifugal pumps
MX2011002665A (en) 2008-09-10 2011-07-28 Pentair Pump Group Inc High-efficiency, multi-stage centrifugal pump and method of assembly.
IT1392143B1 (en) * 2008-09-15 2012-02-22 Pompe Garbarino S P A MULTI-STAGE CENTRIFUGAL PUMP WITH HYDRAULIC BALANCING DRUM WITH CONTROLLED DRAWING.
DE102013223806A1 (en) 2013-11-21 2015-05-21 Ksb Aktiengesellschaft relief device
EP3171033A1 (en) * 2015-11-19 2017-05-24 Grundfos Holding A/S Multistage centrifugal pump with casing opening for the maintenance of an axial thrust balancing piston
EP3412915B1 (en) * 2017-06-09 2019-12-25 Xylem Europe GmbH Self-adjusting drum system
DE102019001120A1 (en) 2019-02-15 2020-08-20 KSB SE & Co. KGaA Relief device
EP3832143A1 (en) * 2019-12-02 2021-06-09 Sulzer Management AG Pump with a lifting device
DE102020133327B4 (en) 2020-12-14 2023-01-19 KSB SE & Co. KGaA pump assembly

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GB1211243A (en) * 1966-11-12 1970-11-04 Zabranska Fabryka Masz Gornicz Axial balancing arrangement in a rotodynamic pump
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JP3646740B2 (en) * 1995-06-27 2005-05-11 石川島播磨重工業株式会社 Turbo pump with balance piston mechanism
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US5980114A (en) * 1997-01-20 1999-11-09 Oklejas, Jr.; Eli Thrust bearing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018210842A1 (en) 2018-07-02 2020-01-02 KSB SE & Co. KGaA Arrangement for receiving the axial thrust of a centrifugal pump
DE102018210842B4 (en) 2018-07-02 2020-01-16 KSB SE & Co. KGaA Arrangement for receiving the axial thrust of a centrifugal pump
US11536274B2 (en) 2018-07-02 2022-12-27 KSB SE & Co. KGaA Arrangement for receiving the axial thrust of a centrifugal pump

Also Published As

Publication number Publication date
DE19927135A1 (en) 2000-12-21
WO2000077405A1 (en) 2000-12-21
BR0011590A (en) 2002-04-23
ATE246318T1 (en) 2003-08-15
US20020114713A1 (en) 2002-08-22
US6568901B2 (en) 2003-05-27
DE50003122D1 (en) 2003-09-04
EP1185795A1 (en) 2002-03-13

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