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EP0253689A1 - Ejektor mit induzierter Drehung - Google Patents

Ejektor mit induzierter Drehung Download PDF

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Publication number
EP0253689A1
EP0253689A1 EP87401133A EP87401133A EP0253689A1 EP 0253689 A1 EP0253689 A1 EP 0253689A1 EP 87401133 A EP87401133 A EP 87401133A EP 87401133 A EP87401133 A EP 87401133A EP 0253689 A1 EP0253689 A1 EP 0253689A1
Authority
EP
European Patent Office
Prior art keywords
compartment
working fluid
annular
fluid
zone
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
EP87401133A
Other languages
English (en)
French (fr)
Other versions
EP0253689B1 (de
Inventor
Alexandre Rojey
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Priority to AT87401133T priority Critical patent/ATE45207T1/de
Publication of EP0253689A1 publication Critical patent/EP0253689A1/de
Application granted granted Critical
Publication of EP0253689B1 publication Critical patent/EP0253689B1/de
Expired 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
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
    • F04F5/06—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids of rotary type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/42—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow characterised by the input flow of inducing fluid medium being radial or tangential to output flow

Definitions

  • the present invention relates to an ejection method and device for compressing and / or pumping a fluid.
  • the device according to the present invention is compact.
  • the ejectors represent a simple and inexpensive means in terms of investments for compressing a fluid.
  • the ejection devices according to the prior art have a certain number of drawbacks which limit their possibilities of application.
  • the device according to the invention aims to overcome the drawbacks of the devices known in the prior art.
  • the present invention relates to a device for compressing a fluid by expansion of a working fluid comprising a first compartment in which the working fluid circulates, a second compartment in which the fluid to be compressed circulates, a third compartment in which circulates mixing the working fluid and the fluid to be compressed, said mixture coming from a mixing compartment connected to the third compartment and to the first and second compartments.
  • the device according to the invention is characterized in particular in that the mixing compartment has an annular shape and in that the first and second compartments are connected to the mixing compartment by passages adapted to introduce substantially tangentially the working fluid and the fluid to be compressed in the mixing compartment or annular compartment.
  • the annular compartment which has an average outside diameter and an average inside diameter delimiting it, may be provided so that the ratio of the average outside diameter of the annular zone to the difference between said average outside diameter and said average inside diameter is at least equal to 5.
  • the second compartment for distributing the fluid to be compressed may comprise a circular crown pierced with channels opening onto the annular compartment, these channels possibly being regularly spaced around the periphery of said annular compartment, and being able to be curved so as to introduce the fluid to be compressed with a substantially tangential speed in the annular zone.
  • the third compartment for compressing the mixture of the two fluids from said annular compartment may itself include an annular space in which will be placed rectifier blades adapted to gradually cancel the tangential speed component of the mixture by raising the pressure.
  • the first compartment for distributing the working fluid may comprise a series of converging nozzles opening into the annular compartment, the nozzles preferably being regularly spaced around the periphery of the annular compartment and being inclined so as to introduce the working fluid with a substantially tangential speed in the annular compartment.
  • the first distribution compartment for the working fluid may include a circular crown pierced with channels opening onto the annular compartment, the channels preferably being regularly spaced around the periphery of the annular compartment and having a convergent shape so as to communicate to the working fluid an increasing speed, and also having a curved shape so as to introduce the fluid to be compressed with a speed substantially tangential to the annular compartment.
  • the first compartment for distributing the working fluid may comprise an annular zone comprised between two conical surfaces whose generatrices may form a different angle with the axis of the device so as to create said converging annular zone into which the working fluid will be introduced by an inlet tangential at the level of the largest section and will travel with increasing tangential speed to the smallest section which communicates with the annular compartment.
  • the third compartment for compressing the mixture of the two fluids coming from the annular compartment may itself include an annular zone comprised between two conical surfaces whose generatrices may form a different angle with the axis of the device, so as to create said zone divergent annulus in which the mixture of the two fluids coming from the annular compartment opens at the level of the smallest section and circulates with a decreasing tangential speed to the largest section.
  • the third compression compartment may include a first space between two surfaces placed substantially transverse to the axis of the device in which the mixture can circulate with a decreasing tangential speed while being evacuated at the periphery of said first space, said first space followed by a second space also between two surfaces placed substantially transversely to the axis of the device in which the mixture is brought towards the axis of the device by circulating with a decreasing tangential speed, the second space may be provided with straightening vanes making it possible to gradually cancel the tangential speed of the mixture.
  • the angle of introduction of the working fluid into the first distribution compartment of the working fluid may be modified when the flow rate of said working fluid varies, so as to keep the tangential speed of circulation of the working fluid substantially constant.
  • the device according to the invention can be used to compress a gas or a vapor or to compress a liquid.
  • the working fluid may consist of a gas or a vapor, or even a liquid.
  • FIG. 1 illustrates the principle of an ejection device according to the prior art.
  • the fluid to be compressed arrives via the suction pipe 1.
  • the compression work is provided by a working fluid which arrives through line 2.
  • the fluid to be compressed and the working fluid can thus be admitted into the mixing zone 4 at the same pressure level.
  • the mixing zone 4 there is an exchange of momentum between the working fluid and the fluid to be compressed and at the exit from the mixing zone the speed field can be considered to be substantially uniform.
  • the device made it possible to compress the fluid arriving via line 1 by partially relaxing the working fluid arriving via line 2.
  • such a device has many advantages: - It is completely static, which makes it perfectly reliable. It does not require lubricant and does not present leakage problems at the bearings of compressors fitted with a rotor. - It is simple and inexpensive to make, which makes it particularly attractive whenever it is important to limit the level of investment.
  • Such a device can be used with different liquid fluids or gaseous.
  • An example of the use of a gas-gas ejectocompressor is described in the French patent application registered on June 28, 1985 under number 85/09844, this application describing the compression by such a device of the overhead vapor from a distillation.
  • the friction losses can represent from 5 to 15% of the kinetic energy of the mixture. These losses are linked to the heterogeneity of the speed field at the inlet of the mixer and to the fact that the mixer must have a sufficient length to homogenize this speed field.
  • the generator of the diffuser must not make an angle with the axis greater than approximately 7 °, because of the risks of instability of the flow and therefore the length of the diffuser is important compared to the diameter. This results in losses reaching 15 to 60% of the kinetic energy of the mixture, depending on the ratio of the sections and the technique adopted.
  • the fluid to be compressed which arrives through the nozzle 6 opens at the center of the vortex formed by the working fluid.
  • FIG. 3 The principle of the device according to the invention is illustrated very schematically in FIG. 3.
  • the difference between the mean outside diameter of the annular zone (A) and the mean internal diameter of the annular zone (A) is reduced compared to the mean external diameter, the ratio of the mean external diameter of the annular zone (A) to the difference between the mean external diameter and the mean internal diameter of the annular zone (A) being preferably greater than 5.
  • the respective positions of the first and second zones (I) and (II) can be changed.
  • first zone (I) of introduction of the working fluid can be placed inside said annular space and the second zone (II) of introduction of the low pressure fluid to be compressed at the exterior of said annular space.
  • zones (I) and (II) are placed at different diameters.
  • the first and second zones (I) and (II) may even be located on the same side of the annular zone (A), as shown in the following exemplary embodiments.
  • a first embodiment of the device according to the invention is represented by the diagrams of FIGS. 4A and 4B.
  • FIG. 4A represents a longitudinal section of the device along the plane A-A indicated in FIG. 4B and in FIG. 4B a transverse section of the device by the plane B-B indicated in FIG. 4A.
  • the low pressure fluid to be compressed arrives via the conduit 7. It is then distributed through a circular crown C which in this embodiment represents the second distribution zone (II).
  • this circular crown it is distributed along a series of channels such as C1, C2, C3, C4 arranged substantially radially and placed at regular intervals. These channels are convergent, that is to say that their section decreases towards the periphery of said circular ring, so as to communicate to the low pressure fluid to be compressed at an increasing speed and are curved so as to introduce the low pressure fluid to be compressed with a substantially tangential speed in the annular zone (A).
  • the working fluid arrives through a series of converging nozzles such as T1, T2, T3.
  • these nozzles T represent the first zone (I) for distributing the working fluid.
  • the inlet nozzles T of the working fluid are convergent, so as to impart an increasing speed to the working fluid, while reducing its pressure, so as to bring it to a level lower than that of the fluid to be compressed and are inclined so introducing the working fluid with a tangential speed into the annular zone (A).
  • the orifices located on either side of the annular zone (A) through which the channels such as C1, C2, and C3 open respectively and the nozzles such as T1, T2 and T3 are placed opposite.
  • the working fluid and the low pressure fluid to be compressed are mixed in the annular zone (A) and the mixture of these two fluids circulates with a gyratory movement with an average speed substantially uniform over the entire circumference of the annular space (A) and over the entire passage section of the annular space (A).
  • the blading forms with the longitudinal axis 19 of the device an angle D3 close to 90,. This angle then gradually decreases as it approaches a zero value, so as to gradually reduce the tangential speed of the mixture.
  • the mixture is thus compressed. It is then evacuated through the space ED1 towards the evacuation duct 8.
  • the first, second and third zones (I), (II) and (III) can be produced with different geometries, while being in accordance with the principle of the invention.
  • the circular crown C for distributing the low pressure fluid to be compressed may have an internal diameter different from the inlet duct 7. In particular by increasing this internal diameter, reduces the width of said circular crown which is presented according to the diagram in FIG. 5, which makes it possible to simplify its production.
  • the reference 20 in FIG. 5 represents the outside diameter of the circular crown C and the reference 21 designates the dotted line corresponding to the trace of the inlet duct 7.
  • FIGS. 4A, 4B and 4C The geometry shown diagrammatically in FIGS. 4A, 4B and 4C is particularly advantageous when the low pressure fluid to be compressed is admitted into the annular space (A) with a relatively low speed.
  • this speed it is preferable to communicate this speed gradually so as to avoid a relatively large pressure drop on admission. This is achieved by gradually modifying the section of the channels such as C1, C2, C3, which implies a sufficient length of these channels and a relatively wide distribution ring.
  • the low pressure fluid distribution ring can be produced either by hollowing out channels on a solid part, or by means of blades 22 making it possible to orient the fluid tangentially according to the diagram in FIG. 6.
  • Another possibility consists in distributing the low pressure fluid to be compressed according to a series of nozzles regularly arranged like the channels such as C1, C2, C3 and inclined so as to cause the low pressure fluid to be compressed in the annular space (A) with tangential speed.
  • the distribution of the working fluid in the first zone (I) can also be carried out in a different manner from that described above.
  • the working fluid can be distributed through a circular ring such as that which is shown diagrammatically in FIG. 7.
  • a circular crown such as that which is shown diagrammatically in FIG. 7.
  • this circular crown it is distributed along a series of channels such as T10, T11, T12, T13, T14 arranged radially and placed at regular intervals.
  • These channels are convergent, that is to say that their section decreases towards the inside of said circular ring so as to communicate to the working fluid an increasing speed and are curved so as to introduce the working fluid with a substantially tangential speed into the circular area (A).
  • the internal diameter of the distribution crown can be greater than the external diameter of the annular zone (A) and the distribution crown can be offset in longitudinal position with respect to the annular zone (A), as shown in the diagram of embodiment of FIG. 8.
  • the working fluid arrives tangentially through the opening 23. It joins the annular zone for mixing with the low pressure fluid through the curved annular zone 24.
  • the intermediate annular zone 24 has a shape convergent, which increases the tangential speed of the working fluid.
  • the reference CD1 designates the crown for distributing the working fluid which may preferably include fins.
  • the low pressure fluid to be compressed arrives via the conduit 25. It is rotated in the distribution ring CD2 and mixes with the working fluid in the annular zone (A).
  • This crown may preferably include fins.
  • the first two distribution zones (I) and (II) are placed radially on the same side of the annular zone (A).
  • a converging annular zone such as the intermediate annular zone 24 with a tangential inlet, can also replace the multitireal system such as that shown in FIG. 5, or a distribution crown, such as that represented in FIG. 7.
  • FIG. 9A Such an arrangement is shown in FIG. 9A.
  • the working fluid arrives tangentially through the opening 10. It then passes into the annular zone 12 comprised between two conical surfaces of different angles, so as to create a converging annular zone in which the tangential speed of the working fluid increases due to the restriction of the cross section to the tangential flow of the working fluid.
  • the device according to the invention has the advantage of being able to be used in a wide range of flow rates.
  • the tangential speed in the region (I) of distribution of the working fluid can be modulated, unlike the longitudinal speed which results from the ratio of the flow rate to the passage section perpendicular to the axis of the device.
  • a comparable effect can be obtained, not by modifying the angle of introduction of the intake duct 11, but by modifying the position of a flap which has the effect of reducing more or less the tangential speed of flow.
  • the shutter 14 is an adjustable shutter which makes it possible to keep the tangential speed constant, even when the flow of working fluid varies.
  • This flap is raised when the flow of working fluid decreases, to compensate for the decrease in the speed with which the working fluid opens into the annular space 12 through the opening 10 and lowered when the flow of working fluid increases to compensate increase in the speed with which the working fluid emerges in the annular space 12 through the opening 10.
  • the device according to the invention can thus operate over a wide flow range.
  • FIG. 9A the distribution of the fluid to be compressed can be carried out in substantially the same manner as that shown in FIGS. 4B and 4C.
  • the flap 14 can rotate either around an axis substantially parallel to the axis of the device or around an axis perpendicular to the axis of the device. Finally, several flaps can be arranged so as to obtain a speed orientation effect better distributed over the periphery of the annular section.
  • the third zone (III) for compressing the mixture formed in the annular zone (A) by the working fluid and the low pressure fluid may also have a configuration different from that which is shown in FIG. 4A.
  • FIG. 10 Another example of the geometry of the third zone (III) is shown in FIG. 10.
  • the working fluid mixes with the low pressure fluid which arrives through the conduit 15 in the annular space (A).
  • the mixture of the two fluids flows in the annular space EA2 comprised between two substantially conical surfaces 13 and 26 whose generatrices form a different angle with the axis of the device, so as to create a divergent annular zone in which the mixture of the two fluids coming from the annular zone (A) emerges at the level of the smallest section and circulates with a decreasing tangential speed in the direction of the largest section.
  • the annular zone EA2 is provided, over part of its length, with rectifier blades R2 intended to promote the slowing down of the tangential speed. These rectifier blades can be in certain cases omitted, in order to simplify the manufacture of an apparatus operating according to the principle of the device according to the invention.
  • the mixture of the two fluids is then brought back towards the axis 19 of the device while circulating in the space ED2 comprised between two surfaces 27 and 28 placed in a manner substantially perpendicular to the axis of the device and is evacuated by the conduit 16.
  • the angle formed by the generatrices of the conical surfaces between which the space EA2 is comprised with the axis 19 of the device is preferably variable and gradually increases along this axis considering the direction of circulation of the fluid.
  • the working fluid mixes with the low pressure fluid which arrives through the conduit 17 in the annular space (A).
  • the mixture of the two fluids flows in the space EA3 between two placed surfaces substantially perpendicular to the axis 19 of the device and progressively connecting to the surfaces located on either side of the annular space (A).
  • the mixture circulates with a decreasing tangential speed towards the periphery.
  • the space ED3 At the periphery of the space EA3 it opens onto the space ED3 in which it is brought back towards the axis 19 of the device, the space ED3 being between two surfaces placed in a manner substantially perpendicular to the axis 19 of the device.
  • the ED3 space is provided with rectifier vanes R3, the geometry of which in a front view is shown diagrammatically in FIG. 11B.
  • the angle formed at a point of the blade between the tangent to the surface of the blade and the radius from this point varies between a value close to 90, at the entry (angle D1) and a value close to 0 , at the exit (angle D2), which makes it possible to gradually cancel the tangential speed.
  • the device can be used with liquid, gaseous, or even multiphase two-phase fluids.
  • the low pressure fluid to be compressed can be a gas or a vapor or in some cases a two-phase gas-liquid mixture.
  • the working fluid can also be either a gas or a liquid.
  • each of the fluids can be two-phase.
  • the section of the annular zone, of the nozzles or of the channels which is possibly provided with the first zone (I) of distribution of the working fluid does not constantly decrease between the inlet and the outlet of the working fluid, but passes through a minimum , the sonic neck being located at this minimum section, then growing again.
  • the flow velocity can be subsonic or supersonic. If it is supersonic, the flow section in the third compression zone (III) must also go through a minimum by first decreasing, then gradually increasing.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Saccharide Compounds (AREA)
  • Gas Separation By Absorption (AREA)
  • External Artificial Organs (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Medicinal Preparation (AREA)
EP87401133A 1986-05-22 1987-05-20 Ejektor mit induzierter Drehung Expired EP0253689B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87401133T ATE45207T1 (de) 1986-05-22 1987-05-20 Ejektor mit induzierter drehung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8607444A FR2599093B1 (fr) 1986-05-22 1986-05-22 Ejecteur a rotation induite
FR8607444 1986-05-22

Publications (2)

Publication Number Publication Date
EP0253689A1 true EP0253689A1 (de) 1988-01-20
EP0253689B1 EP0253689B1 (de) 1989-08-02

Family

ID=9335585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401133A Expired EP0253689B1 (de) 1986-05-22 1987-05-20 Ejektor mit induzierter Drehung

Country Status (10)

Country Link
US (1) US4749336A (de)
EP (1) EP0253689B1 (de)
JP (1) JP2864123B2 (de)
KR (1) KR960008965B1 (de)
AT (1) ATE45207T1 (de)
AU (1) AU600943B2 (de)
BR (1) BR8702625A (de)
DE (1) DE3760396D1 (de)
FR (1) FR2599093B1 (de)
IN (1) IN169704B (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720122B1 (fr) * 1994-05-20 1996-06-28 Inst Francais Du Petrole Pompe polyphasique bi-turbojets.
US7794135B2 (en) * 2004-11-05 2010-09-14 Schlumberger Technology Corporation Dry polymer hydration apparatus and methods of use
JP5030520B2 (ja) * 2006-09-29 2012-09-19 富士フイルム株式会社 流体混合方法及びマイクロデバイス
US8807458B2 (en) * 2009-04-29 2014-08-19 King Saud University Vortex-generating nozzle-end ring
DE102009047083C5 (de) * 2009-11-24 2013-09-12 J. Schmalz Gmbh Druckluftbetriebener Unterdruckerzeuger oder Unterdruckgreifer
CN103339452B (zh) * 2011-02-09 2016-01-20 开利公司 喷射器
US9322400B2 (en) * 2012-10-02 2016-04-26 Ford Global Technologies, Llc Jet pump with centralized nozzle
CN109966941A (zh) * 2019-05-13 2019-07-05 江苏炬焰智能科技有限公司 碳酸泉混合器

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE57884C (de) * E. SCHÜRMANN in Riesa Gebläse
FR25258E (fr) * 1921-04-22 1923-01-23 Procédé et appareils pour la compression des fluides gazeux
US1612838A (en) * 1925-04-09 1927-01-04 Centrifix Corp Draft-inducing means
FR707360A (fr) * 1930-12-10 1931-07-07 Procédé et installation pour le traitement de liquides par des gaz
FR712885A (fr) * 1930-04-22 1931-10-14 Paul Lechler Appareil mélangeur pour fluides
GB362430A (en) * 1929-08-30 1931-12-01 Paul Lechler Improvements in or relating to the production of emulsions
FR1048869A (fr) * 1950-10-13 1953-12-24 Stamicarbon Procédé et dispositif pour disperser ou pour dissoudre une substance dans un liquide
FR1150946A (fr) * 1956-05-23 1958-01-22 Fr D Etudes Et De Realisations Thermo-soufflante statique
SU731220A1 (ru) * 1978-10-11 1980-04-30 Куйбышевский Ордена Трудового Красного Знамени Авиационный Институт Им.Академика С.П.Королева Вихрева труба

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046732A (en) * 1956-06-20 1962-07-31 Research Corp Method of energy exchange and apparatus for carrying out the same
US3371618A (en) * 1966-02-18 1968-03-05 Chambers John Pump
US4074954A (en) * 1976-02-27 1978-02-21 Mobil Oil Corporation Compressor
US4409746A (en) * 1981-02-05 1983-10-18 Conoco Inc. Vortex injection dredging apparatus and method
GB2149679A (en) * 1983-11-14 1985-06-19 Conoco Inc Vortex eductor

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE57884C (de) * E. SCHÜRMANN in Riesa Gebläse
FR25258E (fr) * 1921-04-22 1923-01-23 Procédé et appareils pour la compression des fluides gazeux
US1612838A (en) * 1925-04-09 1927-01-04 Centrifix Corp Draft-inducing means
GB362430A (en) * 1929-08-30 1931-12-01 Paul Lechler Improvements in or relating to the production of emulsions
FR712885A (fr) * 1930-04-22 1931-10-14 Paul Lechler Appareil mélangeur pour fluides
FR707360A (fr) * 1930-12-10 1931-07-07 Procédé et installation pour le traitement de liquides par des gaz
FR1048869A (fr) * 1950-10-13 1953-12-24 Stamicarbon Procédé et dispositif pour disperser ou pour dissoudre une substance dans un liquide
FR1150946A (fr) * 1956-05-23 1958-01-22 Fr D Etudes Et De Realisations Thermo-soufflante statique
SU731220A1 (ru) * 1978-10-11 1980-04-30 Куйбышевский Ордена Трудового Красного Знамени Авиационный Институт Им.Академика С.П.Королева Вихрева труба

Also Published As

Publication number Publication date
EP0253689B1 (de) 1989-08-02
AU7324387A (en) 1987-11-26
DE3760396D1 (en) 1989-09-07
FR2599093B1 (fr) 1991-08-02
JP2864123B2 (ja) 1999-03-03
AU600943B2 (en) 1990-08-30
FR2599093A1 (fr) 1987-11-27
BR8702625A (pt) 1988-02-23
KR960008965B1 (ko) 1996-07-10
KR870010904A (ko) 1987-12-18
ATE45207T1 (de) 1989-08-15
US4749336A (en) 1988-06-07
JPS62285000A (ja) 1987-12-10
IN169704B (de) 1991-12-14

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