EP1227243A2 - Einschubstator für Exzenterschneckenpumpen - Google Patents
Einschubstator für Exzenterschneckenpumpen Download PDFInfo
- Publication number
- EP1227243A2 EP1227243A2 EP02001680A EP02001680A EP1227243A2 EP 1227243 A2 EP1227243 A2 EP 1227243A2 EP 02001680 A EP02001680 A EP 02001680A EP 02001680 A EP02001680 A EP 02001680A EP 1227243 A2 EP1227243 A2 EP 1227243A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- elastomer body
- support jacket
- jacket
- stator according
- pressure
- 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.)
- Withdrawn
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
- F04C2/1075—Construction of the stationary member
Definitions
- the present invention relates to a stator for progressing cavity pumps and in particular a stator with an easily replaceable elastomeric inner part.
- stators are usually referred to as insertion stators.
- Stators generally consist of an elastomeric, essentially cylindrical molded part with an internal pump cavity that corresponds to a single or multi-flight screw is shaped and receives the rotor.
- the pump cavity is usually dimensioned so that that the elastomer is pre-loaded on the outside of the rotor.
- the elastomeric inner part is in usually enclosed in a stabilizing jacket.
- the elastomer part wears out during conveyor operation. After a certain period of operation it is therefore necessary to remove the stator and replace the elastomer part or the entire stator.
- stator In composite systems in which the elastomer body is firmly connected to the stabilizing jacket the stator must be replaced as a whole. This is not just for cost reasons, but also disadvantageous from an ecological point of view, since stators of this type are difficult to recycle are.
- the applicant has therefore proposed stators in which the elastomer Inner part is secured against twisting in the conveyor operation and which even at high delivery pressures lead to a good seal.
- This is possible because the insertion stator is next to the elastomer body and the outer support jacket has stabilizing outer parts, which enclose the elastomer body and which in turn held together by the support jacket become.
- the elastomer body has elevations on its outer peripheral surface on which form-fitting in corresponding recesses of the stabilizing outer parts intervention. This positive connection between the elastomer body and the stabilizing one External parts prevent the elastomer body from twisting during conveying.
- a corresponding slide-in stator which can also be re-tensioned to expand the To be able to compensate for the pump cavity after a certain delivery period is, for example described in DE 19847406 A.
- the essentially hollow cylindrical elastomer body this stator has several key-like elevations on its outer circumferential surface, the height of which increases continuously from the suction side towards the pressure side.
- the elastomer body is surrounded by two or more stabilizing outer parts, in which the key-like elevations of the elastomer body corresponding depressions are present.
- the stabilizing outer parts, which surround the elastomer body have an outer contour, which corresponds to that of a truncated cone.
- the continuous increase in diameter of the External parts from the suction side to the pressure side allow the stator to be re-tensioned.
- the support jacket which surrounds the stabilizing outer parts and which the Has the shape of a truncated cone, only further towards the pressure side of the Stator advanced so that the stabilizing outer parts approach each other and the the elastomer body enclosed by them is compressed.
- the conical design of the support jacket and the stabilizing outer parts thus serves Retensioning the stator, while the elastomer body itself is basically a cylindrical one Has shape and only the feather-like elevations of the conical design of the External parts and the support jacket are adjusted.
- the conical stator described above enables easy replacement of the elastomer Inner part with good tightness even at high delivery pressures.
- it poses certain Requirements for the operating personnel, on the one hand, with the relatively large number of individual parts connected (elastomer body, at least two stabilizing outer parts, support jacket and rotor) and, on the other hand, the fact that the support jacket can be moved freely the exact setting of the desired delivery pressure on the stabilizing outer parts is not always easy.
- the object of the invention is to provide such a plug-in stator.
- the insertion stator according to the invention for eccentric screw pumps consists of a removable one Elastomer body with an axial pump cavity to accommodate a rotor.
- This pump cavity can basically be used in any state of the art Technically usual manner.
- the elastomer body is essentially conical and includes an outer surface that is substantially in the shape of a truncated cone having.
- This conical elastomer body is supported by a tubular support jacket surrounded, the cavity of which has the shape of a truncated cone.
- elastomer body and support jacket are formed so that the frustoconical outer surface of the elastomer body and bear against the inner surface of the support jacket in a form-fitting manner.
- the elastomer body of the invention is missing Insertion stator the elevations on the outer peripheral surface. This also stabilizes External parts can be dispensed with, in the recesses the elevations of the elastomer body were recorded so as to twist the elastomer body during operation of the stator prevent. It has now been found completely surprisingly that such elevations on the outer peripheral surface of the elastomer body are not required to twist the elastomer body to prevent during operation. Rather, a twisting of the elastomer body even with a completely smooth outer circumferential surface that has no anti-rotation lock in the form of Has elevations or depressions, solely by the conical shape of the outer peripheral surface can be prevented safely.
- the conical configuration of the support jacket and the elastomer body does not serve Retensionability of the slide-in stator, as is the case with the conical design of the support jacket and the stabilizing outer parts in the stator, which is described in DE 19847406 A is described. Rather, it creates the possibility of the elastomer body without the application of great force to fit tightly into the pipe jacket and also easily out of it to be able to remove. After inserting the elastomer body into the support jacket from the outer surface of the truncated cone of the elastomeric body lies towards the larger and smaller opening over a large area on the inner surface of the support jacket.
- the elastomer body and support jacket are positioned in a predetermined position to each other. Both the elastomer body as well as the support jacket therefore have positioning aids that ensure that both parts are arranged in the desired orientation to each other. These consist of step-shaped stops at any point on the outer surface of the elastomer body and the inner surface of the support jacket can be arranged. So the elastomer body has for example in its pressure-side end area, one over its outer surface protruding projection, which is expediently formed in a circular manner.
- the diameter of the elastomer body In order to prevent the elastomer body from rotating in the support jacket, it has proven to be Proven to be the diameter of the elastomer body compared to the diameter of the support jacket to enlarge something.
- the outer diameter of the elastomer body is therefore expedient in the area of its truncated cone outer surface larger than the corresponding one Inner diameter of the support jacket where the elastomer body in the installed state with the Support jacket comes into contact. In this way, the elastomer body is already under tension on the inner surface of the support jacket, even before the rotor enters the pump cavity is screwed in and thus further increases the clamping effect.
- the elastomer body and support jacket have the same angle of inclination, that is same continuous increase in thickness over its length.
- the angle of inclination here the angle between the inner surface of the support jacket or the outer surface of the Understand the elastomer body to a plane perpendicular to the respective axial direction be, the angle of inclination is measured in the direction of the pressure side and so is greater than 90 °. Suitable angles of inclination are, for example, between 91 and 95 °.
- the angle of inclination in the elastomer body is different from the angle of inclination of the support jacket deviates somewhat in order to create a gradient of the contact pressure. If, for example, the angle of inclination in the elastomer body is somewhat larger than the angle of inclination of the support jacket, the pressure with which the elastomer applies to the rotor increases is pressed slightly from the suction side to the pressure side.
- the elastomer body has a greater length than the support jacket having.
- the shorter length of the support jacket does not have the purpose, however to be able to move the stator in the axial direction of the elastomer body.
- Much more the support jacket is appropriately dimensioned so that it is installed in the Eccentric screw pump device of the distance between the suction and pressure side Fills the connector part of the pump device completely and thus further deformation of the Prevents elastomer body. Because of the greater length of the elastomer body is initially a part of the truncated cone outer surface of the elastomer body out through the support jacket. When clamping the stator between the connection parts of the eccentric screw pump device this material is compressed into the support jacket.
- a particularly good seal in the pressure-side area of the stator can also be created be that in addition to the pressure side flange-like projection, which in the pressure side connection part of the feed pump is accommodated, one of the flange-like projection outgoing annular support surface is present, which increases radially outwards towards the suction side.
- This annular bearing surface is pumped in the direction of the pressure-side connection flange the pump device pressed until it rests on the entire surface of this flange.
- the annular sealing surface thus obtained ensures a particularly good seal in the print side area.
- a particularly good protection against twisting of the elastomer body in the support jacket can be achieved in that the inner surface of the support jacket with a surface structuring is provided.
- surface structuring relief-like, large areas should be used Structures are understood with which the friction between the support jacket and the elastomer body can be increased. The depth of the structures only moves in millimeters or Submillimeter range.
- the surface structuring can be mechanical or chemical Surface processing be generated. An example is the processing of the surface by sandblasting.
- Another option is to have the surface structures already to generate when manufacturing the support jacket. For example, the support jacket by turning manufactured, this process can be done deliberately so that a coarse screen arises at which transverse grooves are generated in the inner surface of the jacket.
- the support jacket can in principle be used for any such jacket in the prior art material used. Metal is particularly suitable.
- the Support jacket with the mountings customary in the prior art for fastening in the eccentric screw pump device be provided. For example, at least one over is suitable its outer surface protruding stop, which for example on one of the connecting flanges the pump device comes to rest and a turning of the jacket during the Operation of the device prevented.
- lateral holding arms can be used for Attachment to the tie rods of the pump device.
- the production of the support jacket is not based on the methods already described or other special manufacturing processes limited. Exemplary of other types of manufacture casting processes, rolling processes or hydroforming processes can be called.
- the elastomer body can also be used from all those already used in the prior art Materials are manufactured using the processes used there.
- An example is on Rubber, natural or synthetic rubber or polyurethane referenced.
- the elastomer body 1 shows an elastomer body 1 of an insertion stator according to the invention in FIG Side view.
- the elastomer body 1 essentially has the shape of a truncated cone a longitudinal pump cavity for receiving a rotor (not shown).
- Their heights l1 and l2 and their diameters D1 and D4 are dimensioned so that that they are in corresponding recesses in the connecting flanges of the eccentric screw pump Find admission.
- the side of the truncated cone with the smaller diameter is with the suction side, the one with the larger diameter with the pressure side of the device connected.
- the diameter increase of the elastomer body 1 takes place in the axial direction continuously. In the case shown, the angle of inclination ⁇ is 91.35 °.
- annular contact surface 6 which starts from the flange-like projection 5 and extends radially outwards and in Extends towards the suction side. Above this contact surface 6 jumps in Projection 3 laterally over the entire outer circumference of the truncated cone surface. On his suction-side end it forms a support surface 2 for the support jacket, which during assembly is pulled over the elastomer body.
- This support jacket is shown in FIG. 2 and provided with the reference number 7. He is like the elastomer body is conical and has the same angle of inclination ⁇ of 91.35 ° on. In its pressure side area, it has a protuberance 9, the shape of the Projection 3 of the elastomer body 1 corresponds.
- stage 8 of the support jacket comes 7 to lie on the contact surface 2 of the projection 3 of the elastomer body 1. Thereby further inadvertent advancement of the support jacket on the elastomer body is prevented.
- the elastomer body rests in the supporting jacket with a prestress
- the elastomer body has an outer diameter that is slightly larger than the corresponding inner diameter of the Supporting jacket.
- the diameter difference can usefully be about 0.5 mm.
- the diameter D1 of the elastomer body 1 0.5 mm larger than the corresponding diameter D5 of the support jacket.
- Appropriate Diameter differences of 0.5 mm can also be found between the related ones Diameters D2 and D6 as well as D3 and D7.
- the elastomer body 1 is therefore with its outer surface on the entire inner surface of the support jacket 7 with prestress. This Biasing is further increased by screwing the rotor into the pump cavity.
- This large-area positive connection reliably prevents the elastomer body rotates in the support jacket during operation of the stator, even if the elastomer body has no key-like or other elevations on its outer surface has, as they were common in the prior art, to the rotating of the elastomer body to prevent. Stabilizing outer parts, as used in the prior art the key-like protrusions were not required.
- the invention Insert stator consists only of the elastomer body receiving the rotor and the support jacket.
- Figure 3 illustrates the assembly of the elastomer body and support jacket of the invention Stator. Only the print side area is shown. Because of the conical shape of the elastomer body and the supporting jacket is the sliding on of the supporting jacket the elastomer body possible without great effort. If necessary, the support jacket brought into the end position shown in the right part of the figure by lightly opening it become.
- the pressure-side projection of the elastomer body 1 is positive in the Well 9 of the tubular jacket 7 added.
- the depression 9 here is in a recess in the jacket wall.
- FIG. 4 shows an insertion stator according to the invention comprising an elastomer body 1 and a support jacket 7 with the rotor turned in an eccentric screw pump device.
- the front flange projections 4 and 5 of the elastomer body come in associated Wells of the connecting flanges 10 and 11 of the device to lie.
- Upper flange 11 and The lower flange 10 are held together by the tie rods 12 and 12 ', which are merely shown here are indicated by the dashed lines.
- Figure 4 shows the device in one inoperative condition from tensioning the tie rods 12 and 12 '.
- the illustration shows that the total length L1 (FIG. 1) of the elastomer body is greater is than the total length of the support jacket 7 and on the other hand, with the same length of the projections 3 and 9, the length L3 of the truncated cone section of the elastomer body 1 has a greater length has as the length L2 of the truncated cone section of the support shell 7. Accordingly, the Elastomer body 1 with a length l3 over the suction end of the support jacket 7 over. The Length l3 is about 1 cm in the case shown.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
Description
- Figur 1
- einen Elastomerkörper eines erfindungsgemäßen Einschubstators in Seitenansicht
- Figur 2
- einen zugehörigen Stützmantel im Längsschnitt
- Figur 3
- einen druckseitigen Ausschnitt eines Stützmantels, der auf einem Elastomerkörper angeordnet ist, im Längsschnitt
- Figur 4
- einen in einer Exzenterschneckenpumpen-Vorrichtung vormontierten erfindungsgemäßen Stator
- Figur 5
- den Stator gemäß Figur 4 in fertig montiertem Zustand.
Claims (12)
- Einschubstator für Exzenterschneckenpumpen, bestehend aus einem herausnehmbaren Elastomerkörper (1), der eine im Wesentlichen die Form eines Kegelstumpfmantels aufweisende Außenoberfläche zur formschlüssigen Aufnahme in einem Stützmantel (7) umfasst und einen in axialer Richtung verlaufenden Pumpenhohlraum zur Aufnahme eines Rotors aufweist, und einem rohrförmigen, einen Hohlraum in Form eines Kegelstumpfes umschließenden Stützmantel (7) mit einer saugseitigen Öffnung geringeren Durchmessers (D5) und einer druckseitigen Öffnung größeren Durchmessers (D7),
dadurch gekennzeichnet, dass der Elastomerkörper (1) einen über die Außenoberfläche vorstehenden Vorsprung (3) aufweist und im Stützmantels (7) eine entsprechende Vertiefung oder Ausstülpung (9) zur Aufnahme des Vorsprungs (3) vorhanden ist. - Einschubstator gemäß Anspruch 1,
dadurch gekennzeichnet, dass der Vorsprung (3) ringförmig umlaufend im druckseitigen Endbereich des Elastomerkörpers (1) ausgebildet ist sowie Vertiefung oder Ausstülpung (9) ringförmig umlaufend im druckseitigen Endbereich des Stützmantels (7) ausgebildet sind. - Einschubstator gemäß Anspruch 1 oder 2,
dadurch gekennzeichnet, dass der Durchmesser des Elastomerkörpers (1) in jedem Abschnitt der Kegelstumpf-Außenoberfläche geringfügig größer ist als der Innendurchmesser des entsprechenden Abschnitts des Stützmantels (7), der im Einbauzustand mit dem Elastomerkörper (1) in Kontakt kommt (D5 > D1; D6 > D2; D7 > D3). - Einschubstator gemäß einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der Neigungswinkel (α) zwischen Kegelstumpf-Außenoberfläche des Elastomerkörpers (1) und einer zur Achsrichtung des Elastomerkörpers (1) senkrechten Ebene, gemessen zur Druckseite hin, im Wesentlichen dem Neigungswinkel (α) zwischen Stützmantel-Innenoberfläche und einer zur Achsrichtung des Stützmantels (7) senkrechten Ebene entspricht und insbesondere zwischen 91° und 95 ° liegt. - Einschubstator gemäß einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der Neigungswinkel (α) zwischen Kegelstumpf-Außenoberfläche des Elastomerkörpers (1) und einer zur Achsrichtung des Elastomerkörpers (1) senkrechten Ebene, gemessen zur Druckseite hin, geringfügig größer ist als der Neigungswinkel (α) zwischen Stützmantel-Innenoberfläche und einer zur Achsrichtung des Stützmantels (7) senkrechten Ebene. - Einschubstator gemäß einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, dass der Elastomerkörper (1) an seiner saugseitigen und/oder druckseitigen Stirnseite einen flanschähnlichen Vorsprung (4, 5) aufweist. - Einschubstator gemäß Anspruch 6,
dadurch gekennzeichnet, dass der Elastomerkörper (1) ausgehend von dem druckseitigen, flanschähnlichen Vorsprung (5) eine radial nach außen und in Richtung zur Saugseite hin ansteigende ringförmige Auflagefläche (6) besitzt. - Einschubstator gemäß einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, dass der Elastomerkörper (1) eine größere Länge (L1) aufweist als der Stützmantel (7; L2). - Einschubstator gemäß einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, dass die Länge (L3) der Kegelstumpf-Außenoberfläche des Elastomerkörpers (1) vom saugseitigen Ende (2) des Vorsprungs (3) bis zur saugseitigen Stirnseite des Elastomerkörpers (1) bzw. bis zum druckseitigen Ende des saugseitigen, flanschähnlichen Vorsprungs (4) größer ist als die Länge (L2) des Stützmantels (7) bzw. die Länge des Stützmantels (7) von dessen saugseitigem Ende bis zum saugseitigen Ende von dessen Vertiefung oder Ausstülpung (9) und der Längenunterschied (13) insbesondere 0,5 bis 1,5 cm, vorzugsweise ca. 1 cm, beträgt. - Einschubstator gemäß einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, dass der Stützmantel (7) im Bereich seiner Innenoberfläche eine Oberflächenstrukturierung und insbesondere eine durch mechanische oder chemische Oberflächenbearbeitung erzeugte Oberflächenstrukturierung aufweist. - Einschubstator gemäß Anspruch 10,
dadurch gekennzeichnet, dass die Oberflächenstrukturierung durch Sandstrahlen, beim Herstellen des Stützmantels (7) durch Drehen oder beim Herstellen des Stützmantels (7) durch Drücken über einen oberflächenstrukturierten Dorn erhalten worden ist. - Einschubstator gemäß einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet, dass der Stützmantel (7) wenigstens einen über seine Außenoberfläche vorstehenden Anschlag (13) aufweist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001103476 DE10103476C1 (de) | 2001-01-26 | 2001-01-26 | Einschubstator für Exzenterschneckenpumpen |
DE10103476 | 2001-01-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1227243A2 true EP1227243A2 (de) | 2002-07-31 |
EP1227243A3 EP1227243A3 (de) | 2003-10-22 |
Family
ID=7671817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02001680A Withdrawn EP1227243A3 (de) | 2001-01-26 | 2002-01-24 | Einschubstator für Exzenterschneckenpumpen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1227243A3 (de) |
DE (1) | DE10103476C1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104847657A (zh) * | 2015-05-07 | 2015-08-19 | 北京工业大学 | 一种多头锥螺杆衬套副及其曲面的成形方法 |
US10480506B2 (en) | 2014-02-18 | 2019-11-19 | Vert Rotors Uk Limited | Conical screw machine with rotating inner and outer elements that are longitudinally fixed |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19847406A1 (de) | 1998-10-14 | 2000-04-27 | Usd Formteiltechnik Gmbh | Stator für Exzenterschneckenpumpen |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3139035A (en) * | 1960-10-24 | 1964-06-30 | Walter J O'connor | Cavity pump mechanism |
DE1553197A1 (de) * | 1965-09-08 | 1970-08-06 | Schlecht Dipl Ing Karl | Exzenterschneckenpumpe mit verschiebbarem Stator |
US5807087A (en) * | 1997-03-21 | 1998-09-15 | Tarby, Inc. | Stator assembly for a progressing cavity pump |
-
2001
- 2001-01-26 DE DE2001103476 patent/DE10103476C1/de not_active Expired - Fee Related
-
2002
- 2002-01-24 EP EP02001680A patent/EP1227243A3/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19847406A1 (de) | 1998-10-14 | 2000-04-27 | Usd Formteiltechnik Gmbh | Stator für Exzenterschneckenpumpen |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10480506B2 (en) | 2014-02-18 | 2019-11-19 | Vert Rotors Uk Limited | Conical screw machine with rotating inner and outer elements that are longitudinally fixed |
US10962004B2 (en) | 2014-02-18 | 2021-03-30 | Vert Rotors Uk Limited | Synchronized conical screw compressor or pump |
CN104847657A (zh) * | 2015-05-07 | 2015-08-19 | 北京工业大学 | 一种多头锥螺杆衬套副及其曲面的成形方法 |
CN104847657B (zh) * | 2015-05-07 | 2016-10-26 | 北京工业大学 | 一种多头锥螺杆衬套副及其曲面的成形方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1227243A3 (de) | 2003-10-22 |
DE10103476C1 (de) | 2002-11-14 |
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