EP0346747B1 - Cyclone separator - Google Patents

Cyclone separator Download PDF

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Publication number
EP0346747B1
EP0346747B1 EP89110281A EP89110281A EP0346747B1 EP 0346747 B1 EP0346747 B1 EP 0346747B1 EP 89110281 A EP89110281 A EP 89110281A EP 89110281 A EP89110281 A EP 89110281A EP 0346747 B1 EP0346747 B1 EP 0346747B1
Authority
EP
European Patent Office
Prior art keywords
solids
discharge
discharge lock
collecting tank
cyclone separator
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.)
Expired - Lifetime
Application number
EP89110281A
Other languages
German (de)
French (fr)
Other versions
EP0346747A3 (en
EP0346747A2 (en
Inventor
Siegbert Dr.-Ing. Schulz
Georg Dipl.-Ing. Baukelmann
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.)
DOZENT DOPPELZYKLON- ENTSTAUBUNGSANLAGEN GmbH
Original Assignee
DOZENT DOPPELZYKLON- ENTSTAUBUNGSANLAGEN GmbH
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Publication date
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Publication of EP0346747A2 publication Critical patent/EP0346747A2/en
Publication of EP0346747A3 publication Critical patent/EP0346747A3/en
Application granted granted Critical
Publication of EP0346747B1 publication Critical patent/EP0346747B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B04C5/181—Bulkheads or central bodies in the discharge opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B04C5/185—Dust collectors

Definitions

  • the invention relates to a cyclone separator according to the introductory part of patent claim 1.
  • Such a cyclone separator is known from DE-C-936488.
  • the hollow discharge lock in this case has a conical section tapering upwards in the solid collection container and a cylinder section protruding into the funnel section of the cyclone housing, as a result of which an annular gap is present between the lower edge of the funnel section opening into the solid collection container and the discharge lock.
  • the invention solves the problem of further increasing the degree of separation of a cyclone separator of the type mentioned at the outset and in particular to ensure that solid particles flowing downward into the solids collection container on the wall of the funnel section are not whirled up again as far as possible.
  • the solids discharge lock acts on the one hand in the funnel section as a vortex limiter and as a guiding device for deflecting the gas flow upwards, and on the other hand uses the negative pressure prevailing in the core of the vortex rotating in the cyclone container to suck gas back from the gas space of the solids collection container into the separation space of the cyclone separator. It arises in Annular gap between the discharge lock and the cyclone housing wall surrounding it, a mainly downward gas flow, from which the flowing away of the separated solid strands into the solid collection container is promoted and prevents an upward directed countercurrent view leading out of the solid collection container from forming in this annular gap.
  • the solids discharge lock is also designed as a cone within the solids collection container, which, however, tapers downwards.
  • the residual swirl of the gas flow entering the collecting container is further reduced, in particular if a solid discharge collar protrudes into the collecting container around the solids discharge lock and widens downward at least in its lower section.
  • the solids discharge lock can be supported on the wall of the cyclone housing or the solids collection container using support struts.
  • the solids discharge lock is carried over the solids collection container by a blade ring with inclined blades. This closes with its blades on the surrounding housing wall The blade ring contributes to the fact that a countercurrent sifting through gas flowing back from the solid collecting container through the annular gap formed between the discharge lock and the surrounding wall does not form.
  • the interior of the solids discharge sluice is connected to the cyclone inlet channel via a return line and a suction fan which promotes the inlet channel is switched into the return line.
  • a suction fan which promotes the inlet channel is switched into the return line.
  • the support elements supporting the discharge lock are preferably used.
  • the solids discharge lock in the solids collection container can be supported on hollow support struts which open into the discharge lock and to which the return line is connected.
  • the embodiments of the cyclone separator each have a cyclone housing with an upper cylindrical housing section 1 and a funnel section 4 which adjoins downwards and tapers downwards and opens into a solids collecting container 5 via a cylindrical solids discharge pipe 8.
  • the solids collection container 5 has an upper cylindrical section with a diameter which is substantially larger than that of the discharge tube 8 and a section which tapers conically downwards.
  • a spiral inlet channel 2 opens into the cylindrical housing section 1 of the cyclone separator and a dip tube 3 protrudes from above to discharge the clean gas flow.
  • a solids discharge lock 6 is installed concentrically, which projects upwards into the funnel section 4 and downwards into the solids collecting container 5.
  • the discharge lock is formed within the funnel section 4 as an upwardly tapering slim cone and, in the embodiments shown, extends within the funnel section 4 over approximately two thirds of the length of the funnel section.
  • the discharge lock 6 is cylindrical within the discharge tube 8 and, at its lower end projecting into the solids collecting container 5, is designed as a cone tapering downwards.
  • a discharge collar 7 projects downwards into the solids collecting container 5 around the discharge lock.
  • the solids discharge lock 6 is hollow and open upwards into the funnel section 4 and downwards into the solids collection container 5.
  • the solids discharge lock 6 is supported on oblique support struts 13 on the wall of the solids collecting container 5.
  • These support struts 13 are hollow, open into the discharge lock 6 and are connected externally to a return line 11 which is returned to the inlet channel 2 of the cyclone separator with the interposition of a suction blower 12.
  • gas and fine solid particles carried by it are discharged in the lower part of the interior of the solids discharge lock 6 and returned to the zykon inlet channel 2.
  • the solids discharge lock is fastened in the discharge pipe 8 with the aid of a blade ring 9 with inclined blades. This additionally prevents constructively that between the discharge lock 6 and the discharge tube 8 an upward directed flow out of the solids collection container is formed, which would lead to a countercurrent sifting.

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  • Cyclones (AREA)

Description

Die Erfindung betrifft einen Zyklonabscheider gemäß dem einleitenden Teil des Patentanspruchs 1.The invention relates to a cyclone separator according to the introductory part of patent claim 1.

Ein derartiger Zyklonabscheider ist aus der DE-C-936488 bekannt. Die hohle Austragsschleuse weist hierbei in dem Feststoffsammelbehälter einen sich nach oben verjüngenden Kegelabschnitt und einen in den Trichterabschnitt des Zyklongehäuses hineinragenden Zylinderabschnitt auf, wodurch zwischen dem in den Feststoffsammelbehälter mündenden unteren Rand des Trichterabschnitts und der Austragsschleuse ein ringförmiger Spalt vorliegt.Such a cyclone separator is known from DE-C-936488. The hollow discharge lock in this case has a conical section tapering upwards in the solid collection container and a cylinder section protruding into the funnel section of the cyclone housing, as a result of which an annular gap is present between the lower edge of the funnel section opening into the solid collection container and the discharge lock.

Durch die Erfindung wird die Aufgabe gelöst, den Abscheidegrad eines Zyklonabscheiders eingangs erwähnter Art weiter zu erhöhen und insbesondere dafür zu sorgen, daß an der Wand des Trichterabschnittes nach unten in den Feststoffsammelbehälter fließende Feststoffteilchen möglichst nicht wieder aufgewirbelt werden.The invention solves the problem of further increasing the degree of separation of a cyclone separator of the type mentioned at the outset and in particular to ensure that solid particles flowing downward into the solids collection container on the wall of the funnel section are not whirled up again as far as possible.

Dies wird erfindungsgemäß durch die im Patentanspruch 1 angegebenen Merkmale erreicht.This is achieved according to the invention by the features specified in claim 1.

Die erfindungsgemäße Feststoff-Austragsschleuse wirkt einerseits in dem Trichterabschnitt als Wirbelbegrenzer und als Leitvorrichtung zum Umlenken der Gasströmung nach oben und nutzt andererseits den im Kern des im Zyklonbehälter rotierenden Wirbels herrschenden Unterdruck dazu aus, Gas aus dem Gasraum des Feststoffsammelbehälters in den Abscheideraum des Zyklonabscheiders zurückzusaugen. Es entsteht im Ringspalt zwischen der Austragsschleuse und der diese umgebenden Zyklongehäusewand eine hauptsächlich abwärts gerichtete Gasströmung, von welcher das Abfließen der abgeschiedenen Feststoffsträhnen in den Feststoffsammelbehälter begünstigt wird und verhindert wird, daß sich in diesem Ringspalt eine nach oben gerichtete, aus dem Feststoffsammelbehälter herausführende Gegenstromsichtung ausbildet.The solids discharge lock according to the invention acts on the one hand in the funnel section as a vortex limiter and as a guiding device for deflecting the gas flow upwards, and on the other hand uses the negative pressure prevailing in the core of the vortex rotating in the cyclone container to suck gas back from the gas space of the solids collection container into the separation space of the cyclone separator. It arises in Annular gap between the discharge lock and the cyclone housing wall surrounding it, a mainly downward gas flow, from which the flowing away of the separated solid strands into the solid collection container is promoted and prevents an upward directed countercurrent view leading out of the solid collection container from forming in this annular gap.

Vorzugsweise ist die Feststoff-Austragsschleuse auch innerhalb des Feststoffsammelbehälters als Kegel ausgebildet, der sich jedoch nach unten verjüngt. Hierdurch wird der Restdrall der in den Sammelbehälter eintretenden Gasströmung weiter vermindert, insbesondere wenn in den Sammelbehälter rings der Feststoff-Austragsschleuse ein Feststoff-Austragskragen hineinragt, der sich wenigstens in seinem unteren Abschnitt diffusorartig nach unten erweitert.Preferably, the solids discharge lock is also designed as a cone within the solids collection container, which, however, tapers downwards. As a result, the residual swirl of the gas flow entering the collecting container is further reduced, in particular if a solid discharge collar protrudes into the collecting container around the solids discharge lock and widens downward at least in its lower section.

Die Feststoff-Austragsschleuse kann mit Hilfe von Stützstreben an der Wand des Zyklongehäuses beziehungsweise des Feststoffsammelbehälters abgestützt werden. In einer anderen Ausführungsform wird die Feststoff-Austragsschleuse über dem Feststoffsammelbehälter von einem Schaufelkranz mit schräg angestellten Schaufeln getragen. Dieser mit seinen Schaufeln an der umgebenden Gehäusewand abschließende Schaufelkranz trägt dazu bei, daß sich eine Gegenstromsichtung durch aus dem Feststoffsammelbehälter durch den Ringspalt zwischen der Austragsschleuse und der umgebenden Wand ausgebildeten Ringspalt zurückströmendes Gas nicht ausbildet.The solids discharge lock can be supported on the wall of the cyclone housing or the solids collection container using support struts. In another embodiment, the solids discharge lock is carried over the solids collection container by a blade ring with inclined blades. This closes with its blades on the surrounding housing wall The blade ring contributes to the fact that a countercurrent sifting through gas flowing back from the solid collecting container through the annular gap formed between the discharge lock and the surrounding wall does not form.

In einer bevorzugten Weiterbildung der Erfindung ist der Innenraum der Feststoff-Austragsschleuse über eine Rückführleitung mit dem Zyklon-Einlaufkanal verbunden und ist in die Rückführleitung ein zum Einlaufkanal förderndes Sauggebläse eingeschaltet. Hierdurch werden feine Feststoffteilchen, die im Gasstrom durch die Austragsschleuse hindurch mitgeführt werden, zum Einlaufkanal des Zyklonabscheiders zurückgesaugt und daher einer neuerlichen Abscheidebehandlung unterworfen. Wenngleich bei dieser Ausführungsform die Feststoff-Austragsschleuse zum Trichterabschnitt des Zyklongehäuses hin geschlossen sein könnte, wird es bevorzugt, die Austragsschleuse auch bei dieser Ausführungsform zum Trichterabschnitt hin offen auszubilden, weil dadurch das Sauggebläse kleiner ausgelegt werden kann.In a preferred development of the invention, the interior of the solids discharge sluice is connected to the cyclone inlet channel via a return line and a suction fan which promotes the inlet channel is switched into the return line. As a result, fine solid particles which are carried in the gas flow through the discharge lock are sucked back to the inlet channel of the cyclone separator and are therefore subjected to a new separation treatment. Although in this embodiment the solids discharge lock could be closed towards the funnel section of the cyclone housing, it is preferred to also make the discharge lock open towards the funnel section in this embodiment because the suction blower can thereby be made smaller.

Zum Anschließen des Innenraums der Feststoff-Austragsschleuse an die Rückführleitung werden vorzugsweise die die Austragsschleuse abstützenden Stützelemente ausgenutzt. Insbesondere kann die Feststoff-Austragsschleuse im Feststoffsammelbehälter auf hohlen Stützstreben abgestützt sein, die in die Austragsschleuse münden und an denen die Rückführleitung angeschlossen ist.To connect the interior of the solids discharge lock to the return line, the support elements supporting the discharge lock are preferably used. In particular, the solids discharge lock in the solids collection container can be supported on hollow support struts which open into the discharge lock and to which the return line is connected.

Die Erfindung wird im folgenden anhand dreier Ausführungsformen erläutert, die aus der Zeichnung jeweils im schematischen Längsschnitt ersichtlich sind.The invention is explained below with reference to three embodiments, each of which can be seen in the drawing in schematic longitudinal section.

Die Ausführungsformen des Zyklonabscheiders weisen jeweils ein Zyklongehäuse mit einem oberen zylindrischen Gehäuseabschnitt 1 und einem sich daran nach unten anschließenden, sich nach unten verjüngenden Trichterabschnitt 4 auf, der über ein zylindrisches Feststoff-Austragsrohr 8 in einen Feststoff-Sammelbehälter 5 mündet. Der Feststoffsammelbehälter 5 weist einen oberen zylindrischen Abschnitt mit einem Durchmesser, der wesentlich größer als derjenige des Austragsrohrs 8 ist, und einen sich trichterförmig nach unten konisch verjüngenden Abschnitt auf. In den zylindrischen Gehäuseabschnitt 1 des Zyklonabscheides mündet oben ein spiralförmiger Einlaufkanal 2 ein und ragt von oben ein Tauchrohr 3 zum Abführen des Reingasstromes hinein.The embodiments of the cyclone separator each have a cyclone housing with an upper cylindrical housing section 1 and a funnel section 4 which adjoins downwards and tapers downwards and opens into a solids collecting container 5 via a cylindrical solids discharge pipe 8. The solids collection container 5 has an upper cylindrical section with a diameter which is substantially larger than that of the discharge tube 8 and a section which tapers conically downwards. A spiral inlet channel 2 opens into the cylindrical housing section 1 of the cyclone separator and a dip tube 3 protrudes from above to discharge the clean gas flow.

In den unteren Teil des Zyklonabscheiders ist eine Feststoff-Austragsschleuse 6 konzentrisch eingebaut, die nach oben in den Trichterabschnitt 4 und nach unten in den Feststoffsammelbehälter 5 hineinragt. Die Austragsschleuse ist innerhalb des Trichterabschnittes 4 als sich nach oben verjüngender schlanker Kegel ausgebildet und erstreckt sich bei den gezeigten Ausführungsformen innerhalb des Trichterabschnittes 4 über etwa zwei Drittel der Länge des Trichterabschnittes. Die Austragsschleuse 6 ist innerhalb des Austragsrohres 8 zylindrisch und an ihrem in den Feststoffsammelbehälter 5 hineinragenden unteren Ende als sich nach unten verjüngender Kegel ausgebildet. In Verlängerung des Austragsrohres 8 ragt rings der Austragsschleuse ein Austragskragen 7 nach unten in den Feststoffsammelbehälter 5.In the lower part of the cyclone separator, a solids discharge lock 6 is installed concentrically, which projects upwards into the funnel section 4 and downwards into the solids collecting container 5. The discharge lock is formed within the funnel section 4 as an upwardly tapering slim cone and, in the embodiments shown, extends within the funnel section 4 over approximately two thirds of the length of the funnel section. The discharge lock 6 is cylindrical within the discharge tube 8 and, at its lower end projecting into the solids collecting container 5, is designed as a cone tapering downwards. In the extension of the discharge tube 8, a discharge collar 7 projects downwards into the solids collecting container 5 around the discharge lock.

Wie aus Figur 2 ersichtlich, ist die Feststoff-Austragsschleuse 6 hohl und nach oben in den Trichterabschnitt 4 sowie nach unten in den Feststoffsammelbehälter 5 hinein offen.As can be seen from FIG. 2, the solids discharge lock 6 is hollow and open upwards into the funnel section 4 and downwards into the solids collection container 5.

Weiter ist bei der Ausführungsform aus Figur 2 die Feststoff-Austragsschleuse 6 auf schrägen Stützstreben 13 an der Wand des Feststoffsammelbehälters 5 abgestützt. Diese Stützstreben 13 sind hohl, münden in die Austragsschleuse 6 und sind außen an eine Rückführleitung 11 angeschlossen, die unter Zwischenschaltung eines Sauggebläses 12 zum Einlaufkanal 2 des Zykonabscheiders zurückgeführt ist. Hierdurch werden im unteren Teil des Innenraumes der Feststoff-Austragsschleuse 6 Gas und von diesem mitgeführte feine Feststoffteilchen abgeführt und in den Zykon-Einlaufkanal 2 zurückgeführt.Furthermore, in the embodiment from FIG. 2, the solids discharge lock 6 is supported on oblique support struts 13 on the wall of the solids collecting container 5. These support struts 13 are hollow, open into the discharge lock 6 and are connected externally to a return line 11 which is returned to the inlet channel 2 of the cyclone separator with the interposition of a suction blower 12. As a result, gas and fine solid particles carried by it are discharged in the lower part of the interior of the solids discharge lock 6 and returned to the zykon inlet channel 2.

Bei der Ausführungsform aus Figur 3 ist die Feststoff-Austragsschleuse mit Hilfe eines Schaufelkranzes 9 mit schräg angestellten Schaufeln im Austragsrohr 8 befestigt. Hierdurch wird zusätzlich konstruktiv verhindert, daß sich zwischen der Austragsschleuse 6 und dem Austragsrohr 8 eine nach oben gerichtete, aus dem Feststoffsammelbehälter herausführende Gegenströmung ausbildet, die zu einer Gegenstromsichtung führen würde.In the embodiment from FIG. 3, the solids discharge lock is fastened in the discharge pipe 8 with the aid of a blade ring 9 with inclined blades. This additionally prevents constructively that between the discharge lock 6 and the discharge tube 8 an upward directed flow out of the solids collection container is formed, which would lead to a countercurrent sifting.

Claims (6)

  1. Cyclone separator the cyclone housing of which comprises an upper cylindrical housing part (1), into which opens an inlet channel (2) and projects an immersion tube (3) for drawing off the clean gasstream, a tapered funnel part (4) following downwards to the cylindrical housing part, the funnel part being downwardly in open connection with a solid collecting tank (5), having a hollow discharge lock (6) for solids projecting into the gas-tight solid collecting tank and disposed coaxial to the cyclone axis, the discharge lock being opening into the funnel part (4) and being open towards the solid collecting tank, characterized in that the discharge lock for solids projects into the funnel part (4) and is a cone tapering upwards within the funnel part; and that between the funnel part (4) and the solid collecting tank (5) a cylindrical discharge tube for solids is formed, wherein the discharge lock for solids passes through the discharge tube in longitudinal direction thereof and that part of the discharge lock for solids (6) running within the discharge tube is formed cylindrically at least along the major part of the length of the discharge tube.
  2. Cyclone separator according to claim 1, characterized in that the discharge lock for solids (6) is formed as a cone tapering upwards within the solid collecting tank (5).
  3. Cyclone separator according to claim 1 or 2, characterized in that around the discharge lock for solids an discharge collar for solids (7) projects into the solid collecting tank (5), the discharge collar enlarging diffusor-like at least within the bottom part thereof.
  4. Cyclone separator according to one of claims 1 to 3, characterized in that the discharge lock for solids (6) is supported above the solid collecting tank (5) by a bucket ring (9) having inclined blades.
  5. Cyclone separator according to one of claims 1 to 4, characterized in that the chamber (10) of the discharge lock (6) for solids is connected to the cyclone inlet channel (2) through a return passage (11) and that an exhaustor feeding to the inlet channel (2) is inserted in the return passage (11).
  6. Cyclone separator according claim 5, characterized in that the discharge lock (6) for solids is supported within the solid collecting tank (5) onto hollow supporting struts (13), which open into the discharge lock (6) and are connected to the return channel (11).
EP89110281A 1988-06-15 1989-06-07 Cyclone separator Expired - Lifetime EP0346747B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8807792U 1988-06-15
DE8807792U DE8807792U1 (en) 1988-06-15 1988-06-15 Cyclone separator

Publications (3)

Publication Number Publication Date
EP0346747A2 EP0346747A2 (en) 1989-12-20
EP0346747A3 EP0346747A3 (en) 1991-02-27
EP0346747B1 true EP0346747B1 (en) 1995-09-06

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EP89110281A Expired - Lifetime EP0346747B1 (en) 1988-06-15 1989-06-07 Cyclone separator

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DE (2) DE8807792U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11007542B2 (en) 2019-04-08 2021-05-18 Fmc Technologies, Inc. Cyclone separator and methods of using same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8807793U1 (en) * 1988-06-15 1988-12-15 Dozent Doppelzyklon-Entstaubungsanlagen GmbH, 4300 Essen Cyclone separator
DE8807792U1 (en) * 1988-06-15 1988-12-15 Dozent Doppelzyklon-Entstaubungsanlagen GmbH, 4300 Essen Cyclone separator
NO180258C (en) * 1994-08-31 1997-03-19 Kvaerner Process Systems As Device by separator
GB9930332D0 (en) * 1999-12-22 2000-02-09 Notetry Ltd Cyclonic separating apparatus
GB0216955D0 (en) * 2002-07-20 2002-08-28 Hoover Ltd Cyclonic vacuum cleaner
CN108434787B (en) * 2018-05-16 2020-03-20 中国海洋石油集团有限公司 Tubular oil-water separation device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB667963A (en) * 1949-01-24 1952-03-12 Humphreys & Glasgow Ltd Separation of liquid or liquid-suspensions from gas
DE936488C (en) * 1949-02-05 1955-12-15 Walter Dr-Ing Barth Cyclone dust collector
GB711394A (en) * 1952-02-01 1954-06-30 Controlled Heat And Air Ltd Improvements relating to centrifugal dust extractors
SU1393486A1 (en) * 1986-04-18 1988-05-07 Предприятие П/Я А-7113 Centrifugal separator
DE8807792U1 (en) * 1988-06-15 1988-12-15 Dozent Doppelzyklon-Entstaubungsanlagen GmbH, 4300 Essen Cyclone separator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11007542B2 (en) 2019-04-08 2021-05-18 Fmc Technologies, Inc. Cyclone separator and methods of using same

Also Published As

Publication number Publication date
EP0346747A3 (en) 1991-02-27
DE58909417D1 (en) 1995-10-12
DE8807792U1 (en) 1988-12-15
EP0346747A2 (en) 1989-12-20

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