EP1219838A2 - Führungsrad für Kreiselpumpen - Google Patents

Führungsrad für Kreiselpumpen Download PDF

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Publication number
EP1219838A2
EP1219838A2 EP01126983A EP01126983A EP1219838A2 EP 1219838 A2 EP1219838 A2 EP 1219838A2 EP 01126983 A EP01126983 A EP 01126983A EP 01126983 A EP01126983 A EP 01126983A EP 1219838 A2 EP1219838 A2 EP 1219838A2
Authority
EP
European Patent Office
Prior art keywords
guide
wall
impeller
guide wheel
entrance edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01126983A
Other languages
English (en)
French (fr)
Other versions
EP1219838B1 (de
EP1219838A3 (de
Inventor
Carlo Serafin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Calpeda SpA
Original Assignee
Calpeda SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Calpeda SpA filed Critical Calpeda SpA
Publication of EP1219838A2 publication Critical patent/EP1219838A2/de
Publication of EP1219838A3 publication Critical patent/EP1219838A3/de
Application granted granted Critical
Publication of EP1219838B1 publication Critical patent/EP1219838B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers

Definitions

  • the present invention relates to a guide wheel for centrifugal pumps of the kind comprising a diffuser with return channels according to the preamble of claim 1, in an embodiment with reduced outer diameter particularly suited for self-priming pumps and/or suction lift operating pumps with fluids containing air or other gaseous substance.
  • a guide wheel for centrifugal pumps of the kind comprising a diffuser with return channels is also called guide rim, directing wheel, guide ring, diffuser with return channels or simply diffuser, highlighting the feature in any case present among its functions.
  • the main function of the return channels in a guide wheel is to convey the flow from the outlet of an impeller to the inlet of a following impeller.
  • the complementary diffuser function may be also obtained with the return channels.
  • multistage pumps are known in which, in order to reduce the outer diameter of the pump or increase the outer diameter of the impellers, so as to obtain the maximum use of a predetermined pump diameter, like for submersed pumps for wells, any bladed part around the periphery of each impeller is removed.
  • the diffuser function is carried out by an annular chamber without blades and with said return channels.
  • a guide wheel with return channels may be applied also in a pump with only one impeller, of the self-priming type, with the main function of deviating the swirling flow at the impeller outlet, with a substantially radial centrifugal and/or tangential peripheral direction, to a substantially axial flow in the central part of the pressure chamber.
  • This flow deviation in a pump with only one impeller reduces the rotational component, the swirling motion and flow velocity to make separation of air or other gaseous substance from the liquid easier, to improve the self-priming capability and reduce pump noise.
  • an embodiment disclosed in said patent uses the return channels, added to a single impeller pump with said main function, also to carry out the complementary diffuser function so as to eliminate the conventional radial bladed diffuser with closed channels arranged around the impeller periphery.
  • the impeller periphery instead inwardly open deflectors are arranged, of less radial dimension and axially inclined for deviating the gaseous portion of the fluid to the return channels.
  • the possibility of further reducing the pump diameter is limited by the radial overlapping of the thickness of the end portion of a guide blade with the thickness of the initial portion of the subsequent blade at the inlet eye of the guide ducts and the arrangement of said inlet eye only in the annular space around the impeller, axially defined by the dividing wall between start of the guide ducts and the return channels downstream.
  • This known embodiment has frontally overlapping and crossing bladed parts, with outwardly radially curved blades frontally intersecting inwardly radially curved blades and each blade is frontally overlapped to portions of two subsequent channels arranged on different planes.
  • This known configuration is difficult to be divided for a molding operation without undercuts.
  • the object of the invention is to provide a guide wheel for a multistage centrifugal pump or a centrifugal pump with single impeller, comprising a diffuser with return channels, in an improved embodiment without the above mentioned drawbacks of either known embodiment.
  • the main object is to obtain a guide wheel with a reduced outer diameter particularly suited for self-priming pumps and/or suction lift operating pumps with fluids containing air or other gaseous substance, said guide wheel being capable to collect and convey quickly to the return channels the gaseous part of the fluid going out from the impeller.
  • Another object is to provide a guide wheel that can be produced with a molding operation without undercuts.
  • a further object of the invention is also to obtain the maximum efficiency and minimal noise of the pump with the constraints determined by said objects.
  • the guide wheel generally indicated with reference numeral 1 is arranged downstream an impeller 2 and inserted in a pump casing 3.
  • Said guide wheel comprises a plurality of guide ducts 4 (also called directing channels, conveyance channels, diffusion ducts) each guide ducts having an initial portion 40 outwardly radially closed by a cylindrical wall 5 of the pump casing 3 containing the guide wheel 1.
  • each guide duct 4 comprises a guide blade 6 (also called directing blade) radially curved outwardly to the cylindrical wall 5 of the pump casing 3, starting from an entrance edge 7 arranged around the outer diameter of the impeller 2.
  • a guide blade 6 also called directing blade
  • Each guide duct 4 comprises a return portion 41 (also called return channel, recirculation channel, reconveyance channel) having a generally radial centripetal direction and axially arranged between a wall 8 adjacent to impeller 2 with the function of dividing the impeller 2 and the guide ducts 4, and a cover wall 9 and is defined by inwardly radially curved blades 10.
  • return portion 41 also called return channel, recirculation channel, reconveyance channel
  • Fig. 1 shows an example of application of the guide wheel 1 with the return portion 41 of the guide ducts 4 arranged adjacent to the front plate and suction side of the impeller 2 in a single impeller pump.
  • the guide wheel of the present invention indeed can be arranged also with the return channels adjacent to the back shroud on the rear side of an impeller or of the impellers of a multistage pump, with the guide wheel inserted in the stage casing and the guide ducts arranged downstream an impeller and upstream a subsequent impeller.
  • the walls 8, 9 of the guide wheel 1 axially defining the guide ducts in the centripetal radial direction, are arranged perpendicular to the impeller rotation axis as shown in Figs. 1 and 3.
  • the walls 8 and 9 in a different embodiment may have a conical shape and/or portions curved in the axial direction.
  • the guide wheel 1 is preferably formed by a first part consisting of the wall 8 adjacent to the impeller 2 and a second part consisting of the cover wall 9, connected to each other by known means. Each of these walls 8 and 9 is formed without undercuts. It is also possible the embodiment with the cylindrical wall 5 of the casing containing the guide wheel and the front cover wall 9 made as a single piece.
  • each blade 10 radially inwardly curved, has a concave wall 11 generally tangent to the cylindrical wall 5 of the casing 3 and a convex wall 12 tangent to a lower diameter relative to the diameter on which said entrance edge 7 is arranged.
  • the front side of the entrance edge 7 of the guide blade 6 arranged around the outer diameter of the impeller 2 has a side portion 70 facing a lower diameter on the wall 8 adjacent to impeller 2, up to a surface 120 tangent to the convex wall 12 of a blade 10 radially curved inwardly.
  • each guide duct 4 is partially arranged on the outside of the entrance edge 7 of the guide blade 6 and is axially extended up to a position intermediate between the wall 8 adjacent to the impeller 2 and the cover wall 9.
  • the portion of the inlet eye 14 axially extended beyond the wall 8 adjacent to the impeller 2 is arranged on the surface 120 tangent to the convex wall 12 outside the return portion 41 of the guide duct 4 preceding in the flow direction.
  • the inlet eye 14 is radially defined outwardly by the cylindrical wall 5 of the casing 3.
  • the portion of the inlet eye 14 with the entrance edge 7 arranged around the outer diameter of the impeller 2 is connected to the start section 15 of the return portion 41 of the guide ducts 4 on the side of wall 8 by a deflecting wall 16 with the function of baffle for the flow deviation in the axial direction and arranged on the outer surface of said guide blade 6.
  • the portion of the inlet eye 14 axially extended beyond the wall 8 is connected to the start section 15 of the return portion 41 through a surface 17 axially inclined or curved to the cover wall 9 and arranged along the surface 120 tangent to the convex wall 12 of blade 10.
  • the inlet eye 14 is axially arranged between the position of surface 17 axially curved or inclined to the cover wall 9 at the start position of the front side of the entrance edge 7, 70 and the start position of the deflecting wall 16 to the wall 8 adjacent to the impeller 2.
  • the front side of the entrance edge 7 around the outer diameter of the impeller 2 is transversally arranged perpendicular to the outlet opening of the impeller 2 as shown for instance in Fig. 4.
  • the front side of the entrance edge 7 may be arranged transversally inclined relative to the outlet opening of the impeller 2, with an inclination in the circular flow direction, from the position of the side portion 70 of the entrance edge 7 to the start position of the deflecting wall 16.
  • the base with radial direction to the inside of the initial portion 170 of the surface axially oriented to the cover wall 9, is arranged on an profile 121 substantially corresponding to an upstream extension of the surface 120 tangent to the convex wall 12 of blade 10.
  • the initial portion 170 has a circular profile 122 on a diameter corresponding to the position of the portion of the inlet eye 14 axially extended beyond the wall 8 and beyond the entrance edge 7, 70.
  • the initial portion 170 has a profile 123 starting from a diameter lower than the diameter on which said portion of the inlet eye 14 axially extended beyond the wall 8 and beyond the entrance edge 7, 70 is arranged.
  • the initial portion 170 of the axially inclined or curved surface is preferably connected to the wall 8 with a rounded edge 18 with gradually variable, increasing and diminishing width, between the start of said axially inclined or curved surface 170 and said lateral entrance edge 70.
  • the rounded edge 18 may have a convex profile 180 as shown in Fig. 8 or alternatively the profile is that of a plane 181 inclined relative to the surfaces 8, 170 connected to each other as shown in Fig. 9. Moreover the profile may be concave 182 as shown in Fig. 10.
  • the rounded edge 18 may have profiles with variable shape starting for instance with a concave profile 182 or plain profile 181 and ending on said lateral entrance edge 70 with a convex rounded portion 180.
  • the rounded edge 18 forms the entrance edge of the portion of the inlet eye 14 axially extended beyond the wall 8 adjacent to the impeller 2.
  • each guide duct 4 is radially defined by walls mainly having a continuous inward orientation.
  • Each guide duct 4 has an external profile with a circular curve along the cylindrical wall 5 of the casing 3 and an inward curve along the concave wall 11 of a blade 10 and an internal profile with a preferably inward continuous orientation along the tangential surface 120 and along the convex wall 12 of a blade 10.
  • each guide duct has the dimensions of the flow passage cross section increasing only in a radial inward direction.
  • the portion of the fluid entering the inlet eye 14 outside the entrance edge 7 on the outer surface of the guide blade 6 takes a slightly diverging direction relative to the direction of the portion of fluid entering the position axially shifted and arranged on a lower diameter on the tangential surface 120.
  • the guide blade 6 may be laterally connected to the wall 8 adjacent to the impeller 2 on the outside of the surface 120 tangent to the convex wall 12, with a bevel 19 from the entrance edge 7, 70 to the end portion of the outer surface of the guide blade 6 defined by the deflecting wall 16 to the start section 15 of the return portion 41 of the guide duct 4.
  • connection between the guide blade 6 and the wall 8 may be carried out in the form of a rounded bevel 190 of gradually variable increasing and diminishing width in the flow direction.
  • the lateral portion 70 of the entrance edge may be inclined, said inclination connecting the guide blade 6 to the wall 8 adjacent to the impeller 2, outside the surface 120 tangent to the convex wall 12 with a gradually variable inclination 191 in the flow direction, from the lateral entrance edge 70 to the start section 15 of the return portion 41 of the guide duct 4.
  • the lateral portion 70 of the entrance edge may be curved to its transversal portion 7 with a curve 192 extending to the start section 15 of the return portion 41 of the guide duct 4, from the base of the deflecting wall 16 on the guide blade 6 to the base of the wall 8 on the surface 120 tangent to the convex wall 12.
  • a dividing rib or anti vortex rib 20 may be inserted between the portion of fluid coming from the guide blade 6 and the portion of fluid coming from the axially shifted underlining position.
  • the area of the flow passage cross sections is kept substantially constant from said inlet eye 14 up to said start section 15 of the return portion 41 of the guide ducts 4.
  • the area of the flow passage cross section can be increased at the zone of said intersection in the initial portion 40 of the guide duct 4.
  • the widening of the cross sections with diffuser functions is mainly and preferably carried out in the return portion 41 of the guide ducts 4, beginning from said start section 15 of said return portion 41, where the flow takes uniform direction and velocity.
  • said guide blade 6 has an angular development 21 less than the circular sector 22 between two subsequent entrance edges 7 of the guide blades 6 arranged around the outer diameter of the impeller 2. With this configuration there are no radial overlappings of the thickness of the end portion 23 of a guide blade 6 with the thickness of the initial portion 7 of the subsequent guide blade.
  • the initial portion 40 of the guide ducts 4 arranged in the flow direction between said entrance edge 7 and said start position 13 of the return portion 41 of the guide ducts 4 and an upstream portion 24 of said entrance edge 7 up to the position of the end portion 23 of the preceding guide blade, are radially closed outwardly by said cylindrical wall 5 of the casing 3.
  • a guide wheel comprising a diffuser with return channels with the configuration according to the invention has several advantages.
  • the ratio between the outer diameter of the guide wheel D5 and the outer diameter of the impeller D2 is reduced to 1.09 while it was 1.3 in another pump with the same impeller but provided with a conventional diffuser with radial peripheral blades, so as to obtain a reduction of the pump diameter of more than 16 percent.
  • the reduced radial extension of the guide wheel of the invention is obtained with inlet eyes of the guide ducts axially extended beyond the wall adjacent to the impeller.
  • the reduction of the ratio between the outer diameter of guide wheel D5 and the outer diameter of the impeller D2 is also obtained avoiding radial overlappings of the end portion of a guide blade with the thickness of the initial portion of the subsequent guide blade in the annular space around the outer diameter of the impeller, so as to reduce the radial space required for the inlet eye on the outside of the entrance edge.
  • Said inlet eyes arranged on the outside of said entrance edge of the guide blades around the outer diameter of the impeller, transversally to the outlet of the impeller, are axially extended up to an intermediate position between said wall adjacent to the impeller and the front cover wall of the guide ducts, starting from a lower diameter relative to the diameter on which said entrance edge is arranged.
  • Said axial extension of the inlet eyes has a surface axially oriented to said cover wall up to the start section of the return portion of the guide duct. Said surface axially oriented to said cover wall starts upstream the inlet eye. This configuration allows the minimum inclination of said surface oriented to the cover wall so as to arrange a portion of the fluid going out from the impeller to be naturally deflected, with a minimal axial deviation, to the portion of the inlet eye axially shifted relative to the position of the impeller outlet.
  • a rounded edge between said axially curved or inclined surface and said wall adjacent to the impeller makes easier the discharge of the gaseous portion circulating in the lateral space between the impeller and said adjacent wall.
  • the portion of fluid entering the inlet eye outside the entrance edge is deviated into the return channel by a deflecting wall on the guide blade.
  • said guide blade directs the fluid to the return channel, avoiding that the centrifugal force of the liquid causes any existing gaseous portion to circulate with a centripetal motion before entering said return channel.
  • a guide wheel is obtained with a reduced outer diameter particularly suited for self-priming pumps and/or suction lift operating pumps with fluids containing air or other gaseous substances, suited to collect and convey quickly to the return channel and the pump outlet, the gaseous portion of the fluid going out from the impeller.
  • the configuration of the channels and guide blades allows the production of the guide wheel of the invention with connected elements formed by molding without undercuts.
  • the walls and/or surfaces of the guide wheel of the invention tend to convey uniformly the flow with a continuous deflection from the peripheral tangential direction to a tendencially radial centripetal direction.
  • the guide wheel of the invention it is possible to obtain a conveyance of the fluid in a path with gradual variation of the shape of its cross sections, with continuous guide of the flow direction and velocity, with smooth surfaces for the fluid flow obtained by molding without finishing operations, balancing the possible losses due to the arrangement of the inlet eye of the guide ducts contained in a narrow radial space around the outer diameter of the impeller.
EP01126983A 2000-11-14 2001-11-13 Führungsrad für Kreiselpumpen Expired - Lifetime EP1219838B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000VI000250A IT1315546B1 (it) 2000-11-14 2000-11-14 Ruota direttrice per pompe centrifughe
ITVI000250 2000-11-14

Publications (3)

Publication Number Publication Date
EP1219838A2 true EP1219838A2 (de) 2002-07-03
EP1219838A3 EP1219838A3 (de) 2002-07-10
EP1219838B1 EP1219838B1 (de) 2003-10-15

Family

ID=11461421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01126983A Expired - Lifetime EP1219838B1 (de) 2000-11-14 2001-11-13 Führungsrad für Kreiselpumpen

Country Status (5)

Country Link
EP (1) EP1219838B1 (de)
AT (1) ATE252205T1 (de)
DE (1) DE60100983T2 (de)
ES (1) ES2207585T3 (de)
IT (1) IT1315546B1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2628958A3 (de) * 2012-02-17 2014-01-08 E.G.O. ELEKTRO-GERÄTEBAU GmbH Leitrad für eine Impellerpumpe und Impellerpumpe
RU2536731C1 (ru) * 2013-07-04 2014-12-27 Закрытое Акционерное Общество "Новомет-Пермь" Ступень центробежного многоступенчатого насоса
US20150071774A1 (en) * 2013-09-06 2015-03-12 Honda Motor Co., Ltd. Centrifugal pump
US20150071773A1 (en) * 2013-09-06 2015-03-12 Honda Motor Co., Ltd. Centrifugal pump
CN104912851A (zh) * 2015-06-29 2015-09-16 广州广一泵业有限公司 一种流道式导叶设计方法
RU2591754C2 (ru) * 2011-05-13 2016-07-20 Бейкер Хьюз Инкорпорейтед Профиль лопатки диффузора с местной выпуклостью
CN107120314A (zh) * 2017-06-02 2017-09-01 哈尔滨电气动力装备有限公司 轴封式核主泵压水室

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2677306C1 (ru) * 2018-02-14 2019-01-16 Сергей Викторович Яблочко Направляющий аппарат центробежного многоступенчатого насоса
RU2680777C1 (ru) * 2018-02-14 2019-02-26 Сергей Викторович Яблочко Направляющий аппарат центробежного многоступенчатого насоса
RU2677303C1 (ru) * 2018-02-14 2019-01-16 Сергей Викторович Яблочко Направляющий аппарат центробежного многоступенчатого насоса
RU2677304C1 (ru) * 2018-02-14 2019-01-16 Сергей Викторович Яблочко Направляющий аппарат центробежного многоступенчатого насоса
RU2677301C1 (ru) * 2018-02-14 2019-01-16 Сергей Викторович Яблочко Направляющий аппарат центробежного многоступенчатого насоса
RU2677299C1 (ru) * 2018-02-14 2019-01-16 Сергей Викторович Яблочко Направляющий аппарат центробежного многоступенчатого насоса
RU2676168C1 (ru) * 2018-02-14 2018-12-26 Сергей Викторович Яблочко Направляющий аппарат центробежного многоступенчатого насоса

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564334A (en) * 1983-04-28 1986-01-14 Klein, Schanzlin & Becker Aktiengesellschaft Guide wheel for multistage centrifugal pumps
EP0361328A1 (de) * 1988-09-26 1990-04-04 CALPEDA S.p.A. Selbstansaugende Strahlpumpe mit axialem Diffusor
EP0401670A2 (de) * 1989-06-07 1990-12-12 Ebara Corporation Selbstansaugende Kreiselpumpe
EP0936356A1 (de) * 1998-02-13 1999-08-18 CALPEDA S.p.A. Selbstansaugende Strahlpumpe mit Durchflusskontrollvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564334A (en) * 1983-04-28 1986-01-14 Klein, Schanzlin & Becker Aktiengesellschaft Guide wheel for multistage centrifugal pumps
EP0361328A1 (de) * 1988-09-26 1990-04-04 CALPEDA S.p.A. Selbstansaugende Strahlpumpe mit axialem Diffusor
EP0401670A2 (de) * 1989-06-07 1990-12-12 Ebara Corporation Selbstansaugende Kreiselpumpe
EP0936356A1 (de) * 1998-02-13 1999-08-18 CALPEDA S.p.A. Selbstansaugende Strahlpumpe mit Durchflusskontrollvorrichtung

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2591754C2 (ru) * 2011-05-13 2016-07-20 Бейкер Хьюз Инкорпорейтед Профиль лопатки диффузора с местной выпуклостью
EP2628958A3 (de) * 2012-02-17 2014-01-08 E.G.O. ELEKTRO-GERÄTEBAU GmbH Leitrad für eine Impellerpumpe und Impellerpumpe
CN103557156A (zh) * 2012-02-17 2014-02-05 E.G.O.电气设备制造股份有限公司 用于叶片泵的导轮和叶片泵
US9388822B2 (en) 2012-02-17 2016-07-12 E.G.O. Elektro-Gerätebau GmbH Guide ring for an impeller pump and impeller pump
RU2536731C1 (ru) * 2013-07-04 2014-12-27 Закрытое Акционерное Общество "Новомет-Пермь" Ступень центробежного многоступенчатого насоса
US20150071774A1 (en) * 2013-09-06 2015-03-12 Honda Motor Co., Ltd. Centrifugal pump
US20150071773A1 (en) * 2013-09-06 2015-03-12 Honda Motor Co., Ltd. Centrifugal pump
CN104421197B (zh) * 2013-09-06 2017-04-12 本田技研工业株式会社 离心泵
US9726180B2 (en) * 2013-09-06 2017-08-08 Honda Motor Co., Ltd. Centrifugal pump
US9726181B2 (en) 2013-09-06 2017-08-08 Honda Motor Co., Ltd. Centrifugal pump
CN104912851A (zh) * 2015-06-29 2015-09-16 广州广一泵业有限公司 一种流道式导叶设计方法
CN107120314A (zh) * 2017-06-02 2017-09-01 哈尔滨电气动力装备有限公司 轴封式核主泵压水室

Also Published As

Publication number Publication date
EP1219838B1 (de) 2003-10-15
DE60100983T2 (de) 2004-09-09
ATE252205T1 (de) 2003-11-15
IT1315546B1 (it) 2003-02-18
ITVI20000250A1 (it) 2002-05-14
EP1219838A3 (de) 2002-07-10
DE60100983D1 (de) 2003-11-20
ES2207585T3 (es) 2004-06-01

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