EP0370863A1 - Vorrichtungen zur Regelung und Steuerung der Gaszufuhr des Brenners eines Kessels - Google Patents

Vorrichtungen zur Regelung und Steuerung der Gaszufuhr des Brenners eines Kessels Download PDF

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Publication number
EP0370863A1
EP0370863A1 EP89403121A EP89403121A EP0370863A1 EP 0370863 A1 EP0370863 A1 EP 0370863A1 EP 89403121 A EP89403121 A EP 89403121A EP 89403121 A EP89403121 A EP 89403121A EP 0370863 A1 EP0370863 A1 EP 0370863A1
Authority
EP
European Patent Office
Prior art keywords
valve
air
gas
spring
chamber
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
EP89403121A
Other languages
English (en)
French (fr)
Other versions
EP0370863B1 (de
Inventor
Joseph Le Mer
Bernard Martel
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.)
Chaffoteaux et Maury SAS
Original Assignee
Chaffoteaux et Maury SAS
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 Chaffoteaux et Maury SAS filed Critical Chaffoteaux et Maury SAS
Priority to AT89403121T priority Critical patent/ATE99401T1/de
Publication of EP0370863A1 publication Critical patent/EP0370863A1/de
Application granted granted Critical
Publication of EP0370863B1 publication Critical patent/EP0370863B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/18—Groups of two or more valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2514—Self-proportioning flow systems

Definitions

  • the invention relates to devices for controlling and regulating the supply of pressurized combustible gas to a gas burner intended for heating the circulating water in a central heating boiler with hot water or in a similar assembly such as a water heater or a bath heater.
  • the invention relates more particularly, among the control and adjustment devices of the kind in question, those which comprise a conduit for pressurized gas, conduit having an inlet, an outlet and a pilot-operated pressure control regulator, that is to say an apparatus mounted on the gas intake manifold and arranged so as to regulate the pressure of the gas coming from a source, such as the network, at a slightly variable pressure at a constant value, apparatus comprising a gas valve urged against its seat by a spring and secured to a waterproof membrane which separates a sealed chamber into two compartments, one of these compartments being connected directly to the source and comprising the seat of the valve and the other compartment being connected on the one hand to the source through a calibrated throttle, and on the other hand to the outlet of the device through a leak valve calibrated by a spring.
  • piloted regulators in the following - further comprise, mounted downstream of this regulator, a control device actuated for example from the flow of water to heat himself.
  • the range in which it is possible to adjust the gas flow rates admitted to the burner is relatively narrow, this range generally extending over a range of 1 to 3 (in the sense that the maximum flow rate of each gas component is roughly three times greater than its minimum flow), and exceptionally from 1 to 5 or from 1 to 6.
  • current boilers can generally operate air flows between 10 and 30 m3 / h, which corresponds to gas flows between 0.75 and 2.5 m3 / h and at heat capacities of the order of 7 to 20 therms (it is recalled that a thermia is equal to 1.16 kW).
  • the object of the invention is, above all, to make such control and regulation devices of the kind in question, that they make it possible to generate heating powers included in ranges much wider than those previously known, these ranges possibly s extend in a range from 1 to 20 with a very low minimum value, and this, using exclusively fluid controls using gas under pressure and air under pressure, that is to say say in particular without involving sophisticated accessories such as ultra-sensitive sensors and electronic control circuits.
  • the very low "minimum value" of the range indicated above corresponds in particular to the production of very small sparks, barely visible to the naked eye, which of course presupposes the use of gas nozzles of very small section: such a very low minimum value can, for example, correspond to an air flow of the order of only 3 m3 / h and correlatively to a gas flow of the order of 0.25 m3 / h.
  • control and regulation devices of the type in question according to the invention also comprise a piloted regulator of the type defined above and they are essentially characterized in that they also comprise means for supplying the burner not only in pressurized gas, but also in pressurized air, the flow rate of the gas being controlled by that of air so that the combustion of the air-gas mixture in the burner is permanently practically complete, said adjustment means comprising a duct for pressurized air with an inlet, an outlet and an intermediate air valve and being arranged so as to control the flow of air passing through said air duct the opening of the leak valve of the piloted regulator, opening which varies in the same direction as the said air flow, and means for applying a slight backpressure as a function of the pressure to the stream of gas leaving the piloted regulator which prevails downstream of the leak valve, back pressure which varies in the opposite direction to said pressure.
  • the means for adjusting the degree of opening of the calibrated leak valve include the air valve mounted so as to be urged upon opening by the air stream itself, and means for applying the displacements of the air valve on the calibration spring of the leak valve, - the air valve is integral with a waterproof membrane itself connected in a sealed manner to the air outlet, and a sealed chamber whose internal volume communicates with the air inlet is interposed between this valve and the spring calibration, said chamber being delimited in part by a rigid ring forming part of the casing of the device, in part by a sealed bellows connecting the inner edge of the ring to the central zone of the air valve and in part by a rigid plate connected tightly by a flexible membrane at the outer edge of the ring, said plate being applied on the one hand, in the direction corresponding to the opening of the valve, against the calibration spring and on the other hand, in the opposite direction from the previous one, against the air valve via a push rod freely passing through the chamber and
  • the invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.
  • the device considered comprises a piloted regulator R whose input 1 is supplied by a combustible gas G1 under slightly variable pressure coming from a source S such as a city network, this regulator being intended to deliver at its outlet 2 a gas flow G2 under constant pressure.
  • This regulator comprises a gas valve 3 urged against its seat 4 by a spring 5 and secured to a waterproof membrane 6 which separates a sealed chamber into two compartments A and B, one of these compartments A being connected directly to the inlet 1 and comprising the seat 4, and the other compartment B being connected on the one hand to the inlet 1 through a calibrated throttle 7 and on the other hand to the outlet 2 through successively a leak valve 8 calibrated by a spring 9, a chamber C traversed by the stem of the valve 81 of this leakage valve and a pipe 10.
  • control and regulation of the supply of the burner U with gas are here directly controlled by the flow of pressurized air intended to supply this burner.
  • the setting in question is determined automatically so as to permanently give the ratio between the two air and gas flow rates the value corresponding to the stoichiometric composition of the mixture, with a slight excess of air, so that combustion is as complete as possible.
  • This duct is equipped with an "air valve" 14 suitable: on the one hand, to adapt automatically to the flow rate and to the pressure of the air applied to the inlet 11, - And on the other hand to act on the leak valve 8, or more exactly on its spring 9, in the direction indicated above.
  • the construction of the air valve 14 must be such that it is extremely sensitive to variations in the pressure of the air applied to the inlet 11.
  • valve is formed by a crew floating supported only by flexible annular membranes, which makes it possible to completely remove the sliding seals and mechanical guides liable to develop hysteresis for reversals of movement
  • - Said valve is arranged in the manner of a force multiplier mechanism in which the upstream air pressure is applied not only on the valve itself, but also on another bearing associated with said valve.
  • the illustrated air valve implements these two arrangements.
  • valve proper 15 constituted by a rigid cone converging upstream and adapted to cooperate with an annular seat 16 forming part of the inlet section 11 and admitting as axis the general axis of revolution X of the device : this axis X is assumed to be vertical in the drawing, the section 11 then being arranged at the base of the device.
  • the valve 15 is supported by a sealed annular membrane 17 which is itself tightly connected to the outlet section 12, or more exactly to an appropriate portion, of the casing 13, contiguous to this section 12 which is here materialized by a light lateral hollowed out in a cylindrical wall.
  • a sealed deformable chamber D is formed inside the casing 13 between the valve 15 and the spring 9.
  • This room D is delimited: - by a rigid ring 18 forming part of the casing 13, - by a tight and flexible bellows 19 sealingly connecting the inner edge of the ring 18 to the center of the conical valve 15 by means of a well 20, - by a rigid plate 21 whose surface transverse is greater than that of the central orifice of the ring 18, - And by a flexible and waterproof annular membrane 22 connecting the edge of the plate 21 and to the periphery of the rigid ring 18.
  • the plate 21 is itself applied: on the one hand in the downstream direction of the air stream admitted into the section 11, that is to say upwards in the drawing, against the spring 9, - And on the other hand in the opposite direction, that is to say upstream of the air stream or downwards, against the valve 15 itself by means of a push rod 23 passing through the chamber D and in particular the bellows 19 and the well 20, this rod 23 being simply interposed between the plate 21 and the valve 15 without being rigidly assembled with these parts.
  • the interior of the chamber D is placed in communication with the interior of the inlet section 11 by a pipe 24.
  • the spring 9 is not placed inside the room C above, but in a room E outside this room C.
  • Said chamber C is delimited on the side of the spring 9 by a small plate 25 secured to the rod 81 of the leakage valve, plate itself connected by an annular waterproof membrane 26 to the casing 13.
  • the chamber E can be brought to the open air by a passage 27 hollowed out in the wall of the casing 13.
  • This chamber E could be juxtaposed with the chamber D over the entire extent of the wall 21 and the membrane 22, but it is preferable to partially define by these last two elements another chamber F which is separated from the chamber E by a bellows watertight 28 connecting the center of the plate 21, on its face opposite to the chamber D, at an annular bearing surface of the casing 13.
  • this pressure is made equal to that which prevails in the hearth of the boiler by making its internal volume communicate with the pipe 29 through another connection pipe 30.
  • This spring 31 reinforces the force of the spring 9 tending to apply the plate 21 against the push rod 23, which makes it possible to slightly compensate for the force multiplier effect exerted in the opposite direction by the very existence of the chamber D.
  • the spring 31 could be omitted not being essential for the principle operation of the assembly; however, it improves accuracy and simplifies the optimization of membrane diameters.
  • valve 15 When no air pressure is applied to the inlet 11, the valve 15 is applied against its seat 16 by the relaxation of the springs 9 and 31.
  • the spring 9 is then in its maximum relaxed state corresponding to the closing of the leak valve 8.
  • This gas flow G2 is all the higher the air flow A2 which gave rise to it is itself higher.
  • the dimensions and other characteristics of the device are chosen so that permanently the ratio between these two flows A2 and G2 corresponds to a complete combustion of their mutual mixture at the burner of the boiler.
  • This second gas valve 32 is itself adjusted as a function of the gas leakage passing through the valve 8 as follows.
  • the valve 32 is extended downstream, that is to say upwards in the drawing, by a rod 34.
  • this rod 34 passes through a sealed chamber H delimited by two sealed annular membranes 37 and 38 supporting the rod and connecting the latter to the casing, said chamber H being placed in communication with chamber C by a pipe 39.
  • this pipe 39 is connected in Y to the pipe 10 above, and the downstream section of this last pipe, designated by the reference 101, opens in the section 2 at a point P located between the two seats 4 and 33.
  • the gas outlet of the device arranged downstream of the valve 32, is designated by the reference 40.
  • the pressure which reigns in the chamber H and which opposes the force of the spring 35 is all the lower - and therefore, the pressure exerted on the second gas valve 32 in the direction of the closure is all the higher - as the leakage through the valve 8 is itself lower.
  • the chamber J which is formed around the spring 35 is here vented through a passage 41 hollowed out in the wall of the casing 13.
  • This room J like the room E above, could be used to impose on the device another control or corrective than those already explained above.
  • the entire rigid casing of the device can be constituted, as shown in the drawing, by stacking a number of cups of revolution around the X axis applied axially against each other with crushing of peripheral beads of membranes (17, 22, 26, 6, 37, 38) or an O-ring (42).
  • Figure 2 relates to a preferred embodiment of a central heating system with hot water equipped with an adjustment device of the kind described above.
  • FIG. 2 shows a certain number of the elements previously described, which are assigned here the same references as previously.
  • the circuit in which the water heated by the burner U circulates is a continuous circuit designated by the reference 43 which passes through heating radiators 44 and is equipped with a circulation pump 45 continuously rotating and an aquastat 46 suitable for constantly reading the water temperature at a given point.
  • the arrow Z symbolizes the control of the fan V control at the temperature detected by aquastat 46, or more precisely the difference between a predetermined set temperature, generally adjustable at will and said detected temperature.
  • This enslavement can lead to a series of cycles each comprising the complete provisional shutdown of the burner and its automatic re-ignition using an igniter not shown.
  • Reference 47 designates a safety valve mounted on the gas inlet.
  • This device has many advantages over those previously known and in particular the following: - it allows an extremely sensitive and faithful control of the gas flow to that of the air, and this for a very wide range going for example from 0.25 to 3.75 m3 / h for gas and from 3 to 45 m3 / h for air, the corresponding pressures going from their side from 10 to 50 millibars for gas and from 0.2 to 7 millibars for air, - the operation is particularly interesting since it uses exclusively the energies of the two fluids (air and gas) for which we want to enslave the flow rates, - the cost price is itself moderate due to the fact that it does not involve any sophisticated electronic detection or control system, - the operating safety of the device is very high: this is how, although it is permanently supplied by the town gas network, it remains completely closed vis-à-vis this gas as long as no flow no air is applied to it, - In the preferred embodiment for which two chambers F and G are provided which are placed in communication with the internal volume of the boiler's heating body, additional

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Fluid-Driven Valves (AREA)
  • Housing For Livestock And Birds (AREA)
EP89403121A 1988-11-16 1989-11-13 Vorrichtungen zur Regelung und Steuerung der Gaszufuhr des Brenners eines Kessels Expired - Lifetime EP0370863B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89403121T ATE99401T1 (de) 1988-11-16 1989-11-13 Vorrichtungen zur regelung und steuerung der gaszufuhr des brenners eines kessels.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8814882 1988-11-16
FR8814882A FR2639094B1 (fr) 1988-11-16 1988-11-16 Perfectionnements aux dispositifs pour commander et regler l'alimentation en gaz du bruleur d'une chaudiere ou analogue

Publications (2)

Publication Number Publication Date
EP0370863A1 true EP0370863A1 (de) 1990-05-30
EP0370863B1 EP0370863B1 (de) 1993-12-29

Family

ID=9371896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89403121A Expired - Lifetime EP0370863B1 (de) 1988-11-16 1989-11-13 Vorrichtungen zur Regelung und Steuerung der Gaszufuhr des Brenners eines Kessels

Country Status (17)

Country Link
US (1) US4958765A (de)
EP (1) EP0370863B1 (de)
JP (1) JPH0648088B2 (de)
KR (2) KR900008218A (de)
CN (1) CN1042770A (de)
AT (1) ATE99401T1 (de)
AU (1) AU625715B2 (de)
BR (1) BR8905797A (de)
CA (1) CA2003021A1 (de)
DE (1) DE68911880T2 (de)
DK (1) DK169635B1 (de)
FR (1) FR2639094B1 (de)
MA (1) MA21677A1 (de)
PT (1) PT92321A (de)
TN (1) TNSN89124A1 (de)
TR (1) TR23987A (de)
ZA (1) ZA898272B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589404A1 (de) * 1992-09-21 1994-03-30 G. Kromschröder Aktiengesellschaft Verfahren und Vorrichtung zum Steuern eines Gasstromes
WO2007057772A2 (en) * 2005-11-18 2007-05-24 Cosmogas S.R.L. Gas-heating apparatus with pre-mix burner, particularly boiler for domestic use
RU2790917C1 (ru) * 2022-06-28 2023-02-28 Акционерное общество "Конструкторское бюро химического машиностроения имени А.М. Исаева" Клапан предохранительный

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107345661A (zh) * 2017-06-30 2017-11-14 浙江科恩电器有限公司 一种能全方位调进风量的完全上进风燃烧器

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR768388A (fr) * 1933-02-08 1934-08-04 Junkers & Co Dispositif distributeur ou régulateur acticnné par des différences de pression degaz pour installations chauffées au gaz
FR1206847A (fr) * 1957-05-21 1960-02-11 American Radiator & Standard Soupape d'arrêt double commandée par un dispositif pilote
FR1240194A (fr) * 1959-10-13 1960-09-02 Saunier Duval Nouveau dispositif de contrôle et de sécurité pour la commande et la régulation de pression du gaz au brûleur sur les appareils de production instantanée d'eau chaude par le gaz
FR1231716A (fr) * 1959-04-03 1960-10-03 Bellofram Patents Perfectionnements apportés aux manostats
FR1467418A (fr) * 1966-02-04 1967-01-27 Grove Valve & Regulator Co Régulateur de la pression d'un fluide
FR1582851A (de) * 1968-04-03 1969-10-10
FR2433159A1 (fr) * 1978-08-11 1980-03-07 Matsushita Electric Ind Co Ltd Appareil servant a regler la temperature du chauffage d'un fluide
EP0275568A1 (de) * 1987-01-23 1988-07-27 Furigas Assen B.V. Gas-gefeuerte Warmwassereinrichtung und mit einem Luftversorgungsventilator und einer Gas/Luft modulierenden Steuerung ausgerüstet

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1573079A (en) * 1924-04-16 1926-02-16 Garnet W Mckee Apparatus for proportionately mixing air and gas
US1892115A (en) * 1929-08-24 1932-12-27 Garnet W Mckee Combustion system
US2311061A (en) * 1939-07-03 1943-02-16 North American Mfg Governor valve mechanism
US2416453A (en) * 1943-12-27 1947-02-25 Stewart Warner Corp Rate changing mechanism
US3158320A (en) * 1962-08-03 1964-11-24 Robert P Duncan Combustion control system
US3827849A (en) * 1971-12-20 1974-08-06 Honeywell Inc Combustion control apparatus
US4097219A (en) * 1975-11-17 1978-06-27 Gerlach-Werke Gmbh Settable regulator device for gas/air mixture ratios
US4717333A (en) * 1983-01-21 1988-01-05 Advanced Mechanical Technology, Inc. Burner ignition system
US4585021A (en) * 1984-02-13 1986-04-29 Maxon Corporation Gas flow rate control regulator valve
US4793798A (en) * 1986-08-08 1988-12-27 Sabin Darrel B Burner apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR768388A (fr) * 1933-02-08 1934-08-04 Junkers & Co Dispositif distributeur ou régulateur acticnné par des différences de pression degaz pour installations chauffées au gaz
FR1206847A (fr) * 1957-05-21 1960-02-11 American Radiator & Standard Soupape d'arrêt double commandée par un dispositif pilote
FR1231716A (fr) * 1959-04-03 1960-10-03 Bellofram Patents Perfectionnements apportés aux manostats
FR1240194A (fr) * 1959-10-13 1960-09-02 Saunier Duval Nouveau dispositif de contrôle et de sécurité pour la commande et la régulation de pression du gaz au brûleur sur les appareils de production instantanée d'eau chaude par le gaz
FR1467418A (fr) * 1966-02-04 1967-01-27 Grove Valve & Regulator Co Régulateur de la pression d'un fluide
FR1582851A (de) * 1968-04-03 1969-10-10
FR2433159A1 (fr) * 1978-08-11 1980-03-07 Matsushita Electric Ind Co Ltd Appareil servant a regler la temperature du chauffage d'un fluide
EP0275568A1 (de) * 1987-01-23 1988-07-27 Furigas Assen B.V. Gas-gefeuerte Warmwassereinrichtung und mit einem Luftversorgungsventilator und einer Gas/Luft modulierenden Steuerung ausgerüstet

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589404A1 (de) * 1992-09-21 1994-03-30 G. Kromschröder Aktiengesellschaft Verfahren und Vorrichtung zum Steuern eines Gasstromes
WO2007057772A2 (en) * 2005-11-18 2007-05-24 Cosmogas S.R.L. Gas-heating apparatus with pre-mix burner, particularly boiler for domestic use
WO2007057772A3 (en) * 2005-11-18 2007-10-18 Cosmogas Srl Gas-heating apparatus with pre-mix burner, particularly boiler for domestic use
RU2790917C1 (ru) * 2022-06-28 2023-02-28 Акционерное общество "Конструкторское бюро химического машиностроения имени А.М. Исаева" Клапан предохранительный

Also Published As

Publication number Publication date
ATE99401T1 (de) 1994-01-15
DK169635B1 (da) 1994-12-27
DE68911880T2 (de) 1994-06-30
FR2639094B1 (fr) 1991-07-12
AU4464589A (en) 1990-05-24
PT92321A (pt) 1990-05-31
KR950014530B1 (ko) 1995-12-05
MA21677A1 (fr) 1990-07-01
ZA898272B (en) 1990-12-28
KR900008218A (ko) 1990-06-02
DK571589D0 (da) 1989-11-15
FR2639094A1 (fr) 1990-05-18
AU625715B2 (en) 1992-07-16
CA2003021A1 (en) 1990-05-16
DK571589A (da) 1990-05-17
JPH02183716A (ja) 1990-07-18
BR8905797A (pt) 1990-06-12
TNSN89124A1 (fr) 1991-02-04
EP0370863B1 (de) 1993-12-29
TR23987A (tr) 1991-01-14
JPH0648088B2 (ja) 1994-06-22
CN1042770A (zh) 1990-06-06
US4958765A (en) 1990-09-25
DE68911880D1 (de) 1994-02-10

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