EP0703028B1 - Device for supplying an internal nozzle of a metallurgical vessel with inert gas - Google Patents

Device for supplying an internal nozzle of a metallurgical vessel with inert gas Download PDF

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Publication number
EP0703028B1
EP0703028B1 EP95402052A EP95402052A EP0703028B1 EP 0703028 B1 EP0703028 B1 EP 0703028B1 EP 95402052 A EP95402052 A EP 95402052A EP 95402052 A EP95402052 A EP 95402052A EP 0703028 B1 EP0703028 B1 EP 0703028B1
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EP
European Patent Office
Prior art keywords
nozzle
internal nozzle
inert gas
internal
accordance
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.)
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EP95402052A
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German (de)
French (fr)
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EP0703028A1 (en
Inventor
Patrick Tassot
Pierre Lerouge
Brunello Rosaia
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Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/462—Means for handling, e.g. adjusting, changing, coupling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • the subject of the present invention is a inert gas supply device for a nozzle internal for metallurgical vessels for casting by bottom, according to the preamble of claim 1.
  • a device which comprises in the direction of casting of steel, i.e. from the distributor to the ingot mold, an internal nozzle resting on a brick of seat fixed to the bottom of the distributor, a plate of fixed reference with a tap hole, a nozzle external submerged in its lower part in the mold and having in its upper part a flat bearing in base shape for loading and moving of the external nozzle in service.
  • the device also includes means exchange of the external nozzle.
  • the two nozzles which are mounted coaxial define a pouring tube of liquid steel from the distributor to the mold and the inlet of this pouring tube forms the neck of the nozzle internal.
  • a distaff partially submerged in the distributor is positioned in the axis of the pouring tube above the neck of the internal nozzle.
  • This distaff has a larger diameter to the pouring tube.
  • the joint planes between the different elements constituting the pouring tube, namely the internal nozzle, reference plate and nozzle external are possible inputs for air ambient.
  • One of the solutions used so far consists of making the internal nozzle in one piece and the reference plate. This solution allows decrease the number of joints.
  • Another complementary solution is to inject an inert gas, such as argon, in the runner and at the joints between the various parts, in particular between the base of the internal nozzle which serves as a fixed reference plate and the base of the external nozzle.
  • an inert gas such as argon
  • the internal material nozzle refractory is equipped with gas diffusion means inert in the runner and between the base of the internal nozzle and the base of the external nozzle.
  • These means of dissemination include supply ports which are connected to pipes of inert gas supported by the means exchange of the external nozzle.
  • these supply ports open onto the external surface of the internal nozzle at the holes provided in a metal case covering the lower part of the internal nozzle, including the base.
  • metal couplers comprising each with a tapped hole.
  • the ends of the gas supply pipes inert are threaded so that they can be screwed into couplers.
  • the nozzle When assembling the assembly by the internal nozzle, the external nozzle and the means exchange of this external nozzle, the nozzle is fixed internal on the exchange means by precisely adjusting the position of the base of this internal nozzle in wedging means provided in the exchange means or independent of these.
  • the metal case covering the base of the internal nozzle makes positioning easier and more reliable of this internal nozzle.
  • connection of supply pipes inert gas on the supply ports require great skill of operators and can present a risk because some connection areas are not visible and may be subject to improper connections.
  • the means of gas diffusion inert lose their effectiveness which may degrade the cleanliness of the liquid steel and adversely affect the regulation flow at the stopper rod level.
  • the end cap cannot be attached to the end of a connecting pipe with the circuit neutral gas supply since the nozzle must be positioned on the nozzle before setting place of the nozzle itself.
  • the invention aims to remedy these drawbacks by proposing a gas supply device inert of an internal nozzle allowing a automatic connection with gas supply pipes inert and reduce the risk of air infiltration in the sprue.
  • Fig. 1 there is shown schematically part of the bottom of a metallurgical vessel 1 from the bottom.
  • the bottom wall 2 is covered with a internal coating 3 of refractory material.
  • the metallurgical vessel 1 consisting for example of a distributor, is generally arranged an ingot mold, not shown, which is intended to receive the liquid steel coming from the distributor 1.
  • the casting of steel is carried out by a device which comprises, in particular in the direction of casting liquid steel, an internal nozzle 10 made of material refractory bearing on an integral seat brick 4 from the bottom of the distributor 1 and an external nozzle 11 also in refractory material located in the axis of the internal nozzle 10.
  • Internal nozzle 10 and external nozzle 11 constitute a pouring tube of the liquid steel of the distributor 1 to the ingot mold and the inlet of this tube of casting forms the neck 10a of the internal nozzle 10.
  • the external nozzle 11 has at its upper part a base 11a cooperating with a reference plate secured to the nozzle internal 10.
  • the device also includes means for setting the internal nozzle 10 and for exchanging the external nozzle 11, these means being designated by a generally by the reference 30 in FIG. 1.
  • the nozzle internal 10 has a vertical body 15 defining a runner 16 of the liquid steel and, at its part lower, a base 17 serving as a reference plate and the external face of which is covered with a housing metallic 18.
  • This metal case 18 facilitates and makes reliable the positioning of the internal nozzle 10 in the means 30 for wedging this internal nozzle 10 and exchanging the external nozzle 11.
  • the setting of the internal nozzle 10 is produced for example by a piece 35 in the form of a fork which applies said internal nozzle 10 to spans 36.
  • the internal nozzle 10 also includes means of diffusion of an inert gas, such as for example of argon, in the runner 16.
  • an inert gas such as for example of argon
  • inert gas diffusion means are used also to bring this inert gas to the level of the neck 10a of the internal nozzle 10.
  • These inert gas diffusion means are formed for example by a cylindrical ring 19 in porous material disposed in a groove 20 formed in the vertical body 11.
  • the internal wall of the cylindrical ring 19 constitutes a length portion of the runner 16 and the groove 20 is connected to a supply device inert gas.
  • the internal nozzle 10 can also include means for diffusing the inert gas at the level of the joint between the base 17 of the internal nozzle 10 and the base 11a of the external nozzle 11.
  • the neck 10a of the internal nozzle 10 can be also equipped with a cylindrical ring made of material porous, not shown, for diffusing the inert gas to the level of this pass.
  • the inert gas supply device comprises at minus one supply orifice 21 located on the face external of the base 17 and connected to the diffusion means of this inert gas through at least one conduit 22 formed in the refractory material of the internal nozzle 10.
  • the conduit 22 can lead to the level of the groove 20 as shown in FIG. 2 and / or at the joint between the base 17 of the internal nozzle 10 and the base 11a of the external nozzle 11.
  • the metal case 18 has a hole 23.
  • the supply orifice 21 is located on the upper external face of the base 17 of the internal nozzle 10.
  • this supply orifice 21 can also be located on the lateral lateral face of the base 17.
  • the supply port 21 is provided with a sealing washer 24 based on graphite or based of another substance that can crash.
  • the device supply of inert gas also includes minus one connection piece 25 intended to be applied on the sealing washer 24 of the supply port 21.
  • connection end piece 25 is slidably mounted for example in a plate 26 of the wedging means of the internal nozzle 10, these wedging means comprising Exhibit 35.
  • wedging means can be integral means 30 for exchanging the external nozzle 11 or independent of these.
  • connection end piece 25 for example of circular section, has a blind hole 27 which only leads to the lower end of this end cap 25.
  • the blind hole 27 is connected by a pipe 31 and hoses, not shown, at fixed inert gas supply circuit to the factory.
  • connection end piece 25 is provided at its part upper of a cap 28 of diameter greater than diameter of the endpiece 25 to form a stop so preventing this tip from coming out of the plate 26.
  • the diameter of the hole 23 of the metal case 18 is greater than the diameter of the connection piece 25 so as not to interfere with its application on the washer seal 24 arranged on the supply orifice 21.
  • connection end piece 25 To apply the connection end piece 25 to the sealing washer 24 with a given torque which will be always identical, this connection end piece 25 is connected to elastic compression members 29.
  • these elastic members of compression are formed by at least one leaf spring 29 one end of which 29a is supported on the cap 28 of the connection end piece 25 and the other end of which 29b is fixed to the support plate 26 by a known fixation.
  • the elastic compression members can also consist of at least one spring.
  • connection piece 25 has a flat surface and this surface plane 25a (Fig. 3) can be provided with a shoulder annular (Fig. 4) so that the contact between the connection end piece 25 and the sealing washer 24 is carried out according to a generator which reduces the risk of inert gas leakage.
  • connection end piece 25 and the supply orifice 21 can be tapered.
  • connection end piece 25 Considering the significant difference between the contact surface of the lower end of the connection end piece 25 and the contact surface of the supply orifice 21, a very positioning precise of this connector 25 is not necessary to make the junction.
  • connection end piece 25 and the supply orifice 21 are produced at the time of positioning of the internal nozzle 10 in the means of wedging of this internal nozzle which are integral means 30 for exchanging the external nozzle 11 or independent of these means of exchange.
  • the plate 26 with the pipe 31, the nozzle 25 and the elastic compression members 29 form a connection assembly of the fixed supply circuit gas to supply port 21 of the internal nozzle 10.
  • connection assembly is disconnected of part 35. After having installed the nozzle internal 10, the connection assembly previously mentioned is brought into position by horizontal translation in the interval between the distributor 1 and the means timing 30.
  • Lugs located below of the plate 26 and of the cells, not shown, on the remaining part of the part 35 allow for example to refine the positioning and a good plate timing 26.
  • the other end of line 31 can be very easily connected to the fixed supply circuit gas by conventional means.
  • the length of line 31 is determined so that access to its end opposite to the connection end piece 25 does not pose no problem.
  • the elastic compression members 29 allow to apply a given torque always rigorously identical to each junction.
  • the metal case 18 can have a guide groove, not shown, of the connection end piece 25 to the supply port 21.
  • the internal nozzle 10 may include one or several supply ports 21 and the device power supply may include one or more end caps connection 25.
  • the inert gas supply device allows for a connection automatic between the means of diffusion of the inert gas of the internal nozzle with the fixed supply circuits inert gas from the plant.
  • the device according to the invention simplifies the manufacture of the nozzle and the metal housing because it is no longer necessary to provide couplers and thereby significantly decrease the price and the cost of maintenance of these two elements.
  • the device according to the invention is particularly interesting when several orifices are planned. Indeed, the more there are supply ports, plus connection of the assembly of these holes is made easier with the device according to the invention.

Abstract

A device is claimed for supplying an inert gas to the inner refractory nozzle (10) for a bottom casting metallurgical vessel (1). The inner nozzle (10) incorporates a vertical body (15) delimiting a casting channel (16), a base plate (17) and some means (19,20) for diffusing the inert gas in the casting channel (16). The device consists of at least one supply orifice (21) situated on the external face of the base plate (17) and connected to the means (19,20) of diffusion by at least one conduit (22) cut in the refractory material of the inner nozzle (10) and at least one connection nipple (25) connected to some means of supplying inert gas. It is supported by some means of chocking the inner nozzle (10) and designed to be applied against the supply orifice (21) by some elastic compression components (29).

Description

La présente invention a pour objet un dispositif d'alimentation en gaz inerte d'une busette interne pour récipients métallurgiques de coulée par le bas, selon le préambule de la revendication 1.The subject of the present invention is a inert gas supply device for a nozzle internal for metallurgical vessels for casting by bottom, according to the preamble of claim 1.

On sait que la coulée de l'acier liquide d'un répartiteur dans une lingotière est généralement réalisée par un dispositif qui comporte dans le sens de coulée de l'acier, c'est à dire à partir du répartiteur vers la lingotière, une busette interne en appui sur une brique de siège solidaire du fond du répartiteur, une plaque de référence fixe présentant un trou de coulée, une busette externe immergée en sa partie basse dans la lingotière et présentant en sa partie haute une portée plate en forme d'embase permettant le chargement et le déplacement de la busette externe en service.We know that the pouring of liquid steel from a distributor in an ingot mold is generally carried out by a device which comprises in the direction of casting of steel, i.e. from the distributor to the ingot mold, an internal nozzle resting on a brick of seat fixed to the bottom of the distributor, a plate of fixed reference with a tap hole, a nozzle external submerged in its lower part in the mold and having in its upper part a flat bearing in base shape for loading and moving of the external nozzle in service.

Le dispositif comporte également des moyens d'échange de la busette externe. Les deux busettes qui sont montées coaxiales définissent un tube de coulée de l'acier liquide du répartiteur vers la lingotière et l'entrée de ce tube de coulée forme le col de la busette interne.The device also includes means exchange of the external nozzle. The two nozzles which are mounted coaxial define a pouring tube of liquid steel from the distributor to the mold and the inlet of this pouring tube forms the neck of the nozzle internal.

Pour réguler ou couper le débit d'acier liquide, une quenouille partiellement immergée dans le répartiteur est positionnée dans l'axe du tube de coulée au-dessus du col de la busette interne.To regulate or cut the steel flow liquid, a distaff partially submerged in the distributor is positioned in the axis of the pouring tube above the neck of the internal nozzle.

Cette quenouille possède un diamètre supérieur au tube de coulée.This distaff has a larger diameter to the pouring tube.

Les plans de joint entre les différents éléments constituant le tube de coulée, a savoir la busette interne, la plaque de référence et la busette externe constituent des entrées possibles pour l'air ambiant.The joint planes between the different elements constituting the pouring tube, namely the internal nozzle, reference plate and nozzle external are possible inputs for air ambient.

En effet, ces zones sont soumises à une dépression importante créée dans le canal de coulée par le jet de métal s'écoulant dans ledit canal.Indeed, these areas are subject to a significant depression created in the sprue by the metal jet flowing in said channel.

La conséquence de ces entrées d'air, azote et oxygène, est une diminution de la propreté du métal.The consequence of these air, nitrogen and oxygen, is a decrease in the cleanliness of the metal.

Jusqu'à présent, diverses solutions ont été mises en oeuvre pour prévenir les entrées d'air dans le canal de coulée dans lequel circule l'acier liquide.So far, various solutions have been implemented to prevent air from entering the pouring channel in which the liquid steel circulates.

Une des solutions utilisée jusqu'à présent consiste à réaliser en une seule pièce la busette interne et la plaque de référence. Cette solution permet de diminuer le nombre de joints.One of the solutions used so far consists of making the internal nozzle in one piece and the reference plate. This solution allows decrease the number of joints.

Une autre solution complémentaire consiste à injecter un gaz inerte, comme par exemple de l'argon, dans le canal de coulée et au niveau des jointures entre les différentes pièces, notamment entre l'embase de la busette interne qui sert de plaque de référence fixe et l'embase de la busette externe.Another complementary solution is to inject an inert gas, such as argon, in the runner and at the joints between the various parts, in particular between the base of the internal nozzle which serves as a fixed reference plate and the base of the external nozzle.

A cet effet, la busette interne en matériau réfractaire est équipée de moyens de diffusion du gaz inerte dans le canal de coulée et entre l'embase de la busette interne et l'embase de la busette externe.For this purpose, the internal material nozzle refractory is equipped with gas diffusion means inert in the runner and between the base of the internal nozzle and the base of the external nozzle.

Ces moyens de diffusion servent aussi à amener le gaz inerte dans l'intervalle qui sépare la quenouille du col de la busette interne afin de maintenir propre cet intervalle étroit.These means of dissemination are also used to bring the inert gas in the interval between the distaff on the neck of the internal nozzle to maintain own this narrow interval.

Ces moyens de diffusion comportent des orifices d'alimentation qui sont raccordés à des tuyauteries d'amenée du gaz inerte supportées par les moyens d'échange de la busette externe.These means of dissemination include supply ports which are connected to pipes of inert gas supported by the means exchange of the external nozzle.

Ces tuyauteries sont raccordées au circuit fixe d'alimentation en gaz inerte de l'usine, éventuellement par l'intermédiaire de flexibles protégés du rayonnement thermique.These pipes are connected to the circuit plant inert gas supply stationary, possibly through hoses protected from thermal rays.

Généralement, ces orifices d'alimentation débouchent sur la surface externe de la busette interne au niveau de trous prévus dans un boítier métallique recouvrant la partie inférieure de la busette interne, notamment l'embase.Generally, these supply ports open onto the external surface of the internal nozzle at the holes provided in a metal case covering the lower part of the internal nozzle, including the base.

Pour cela, lors de la fabrication de la busette interne, on place dans les orifices d'alimentation, avant frittage du matériau réfractaire constituant cette busette, des coupleurs métalliques comportant chacun un orifice taraudé.For this, during the manufacture of the internal nozzle, placed in the supply ports, before sintering of the refractory material constituting this nozzle, metal couplers comprising each with a tapped hole.

Au moment du frittage du matériau réfractaire, ces coupleurs deviennent totalement solidaires de ce matériau.When sintering the refractory material, these couplers become totally integral with this material.

Ensuite, les contours des trous du boítier métallique sont soudés avec les coupleurs pour assurer leur maintien mécanique et l'étanchéité au gaz entre ce boítier métallique et le matériau réfractaire de la busette interne.Then, the contours of the holes in the case metal are welded with couplers to ensure their mechanical retention and gas tightness between this metal housing and the refractory material of the internal nozzle.

Les embouts des tuyauteries d'amenée du gaz inerte sont filetés de façon à pouvoir être vissés dans les coupleurs.The ends of the gas supply pipes inert are threaded so that they can be screwed into couplers.

Lors de l'assemblage de l'ensemble constitué par la busette interne, la busette externe et les moyens d'échange de cette busette externe, on fixe la busette interne sur les moyens d'échange en ajustant précisément la position de l'embase de cette busette interne dans des moyens de calage prévus dans les moyens d'échange ou indépendant de ceux-ci.When assembling the assembly by the internal nozzle, the external nozzle and the means exchange of this external nozzle, the nozzle is fixed internal on the exchange means by precisely adjusting the position of the base of this internal nozzle in wedging means provided in the exchange means or independent of these.

Le boítier métallique recouvrant l'embase de la busette interne facilite et fiabilise le positionnement de cette busette interne.The metal case covering the base of the internal nozzle makes positioning easier and more reliable of this internal nozzle.

Ensuite, on raccorde les tuyauteries d'amenée du gaz inerte supportées par les moyens d'échange de la busette externe à chaque coupleur des orifices d'alimentation des moyens de diffusion du gaz inerte.Then, we connect the supply pipes inert gas supported by the exchange means of the external nozzle at each coupler of the supply ports means for diffusing the inert gas.

Mais, compte tenu de l'encombrement des moyens de calage de la busette interne et des moyens d'échange de la busette externe autour de l'embase de la busette interne, le raccordement des tuyauteries d'amenée de gaz inerte sur les orifices d'alimentation nécessitent une grande habilité des opérateurs et peut présenter un risque car certaines zones de raccordement ne sont pas visibles et peuvent être sujettes à de mauvais branchements.But, given the size of the means for wedging the internal nozzle and means exchanging the external nozzle around the base of the internal nozzle, connection of supply pipes inert gas on the supply ports require great skill of operators and can present a risk because some connection areas are not visible and may be subject to improper connections.

De plus, les coupleurs, pourtant soutenus par soudage dans le boítier métallique de la busette interne, ont tendance à se désolidariser de cette busette interne et à remuer dans le logement ce qui entraíne des fuites de gaz inerte pendant la coulée de l'acier liquide.In addition, the couplers, yet supported by welding in the metal housing of the internal nozzle, tend to separate from this internal nozzle and stir in the housing which causes leaks of inert gas during the pouring of the liquid steel.

De ce fait, les moyens de diffusion du gaz inerte perdent leur efficacité ce qui risque de dégrader la propreté de l'acier liquide et de nuire à la régulation de débit au niveau de la quenouille.Therefore, the means of gas diffusion inert lose their effectiveness which may degrade the cleanliness of the liquid steel and adversely affect the regulation flow at the stopper rod level.

On connaít également dans le DE-A-4 223 944 un dispositif d'alimentation en gaz interne d'une busette munie d'un orifice d'alimentation et dans lequel un embout est appliqué d'une manière étanche contre cet orifice par un collier de serrage.We also know in DE-A-4 223 944 an internal gas supply device for a nozzle provided with a supply port and in which a tip is applied tightly against this orifice by a clamp.

Mais ce dispositif présente des inconvénients qui résident dans le fait que le collier de serrage doit être remplacé après chaque opération de démontage car en général ce collier de serrage est fretté à chaud.But this device has drawbacks which resides in the fact that the hose clamp must be replaced after each disassembly operation because generally this clamp is hooped hot.

De plus, l'embout ne peut pas être fixé à l'extrémité d'une canalisation de liaison avec le circuit d'alimentation en gaz neutre étant donné que l'embout doit être positionné sur la busette avant la mise en place de la busette elle-même.In addition, the end cap cannot be attached to the end of a connecting pipe with the circuit neutral gas supply since the nozzle must be positioned on the nozzle before setting place of the nozzle itself.

L'invention vise à remédier à ces inconvénients en proposant un dispositif d'alimentation en gaz inerte d'une busette interne permettant de réaliser une connexion automatique avec des tuyauteries d'amené de gaz inerte et de réduire les risques d'infiltration d'air dans le canal de coulée.The invention aims to remedy these drawbacks by proposing a gas supply device inert of an internal nozzle allowing a automatic connection with gas supply pipes inert and reduce the risk of air infiltration in the sprue.

L'invention a donc pour objet un dispositif d'alimentation en gaz inerte d'une busette interne en matériau réfractaire pour récipients métallurgiques de coulée vers le bas, la busette interne comportant :

  • un corps vertical délimitant un canal de coulée de l'acier liquide contenu dans le récipient métallurgique,
  • a sa partie inférieure, une embase dont la face externe est recouverte d'un boítier métallique d'ajustage de la busette interne dans des moyens de calage de cette busette interne sur le fond du récipient métallurgique,
  • et des moyens de diffusion du gaz inerte dans le canal de coulée et/ou au niveau de l'interface entre ladite busette interne et une busette externe disposée dans l'axe de la busette interne, lesdits moyens étant alimentés en gaz par au moins un orifice d'alimentation ménagé sur la face externe de la busette interne et relié aux moyens de diffusion du gaz inerte par au moins un conduit ménagé dans le matériau réfractaire de la busette interne, caractérisé en ce que le dispositif comprend au moins un embout de connexion relié à des moyens de fourniture du gaz inerte, supporté par les moyens de calage de la busette interne et destiné à être appliqué par des organes élastiques de compression sur ledit orifice d'alimentation ménagé sur la face externe de l'embase.
The subject of the invention is therefore a device for supplying inert gas to an internal nozzle made of refractory material for metallurgical vessels for downward casting, the internal nozzle comprising:
  • a vertical body delimiting a pouring channel for the liquid steel contained in the metallurgical vessel,
  • at its lower part, a base, the external face of which is covered with a metal housing for adjusting the internal nozzle in means for wedging this internal nozzle on the bottom of the metallurgical container,
  • and means for diffusing the inert gas in the pouring channel and / or at the interface between said internal nozzle and an external nozzle arranged in the axis of the internal nozzle, said means being supplied with gas by at least one supply orifice formed on the external face of the internal nozzle and connected to the means for diffusing the inert gas by at least one conduit formed in the refractory material of the internal nozzle, characterized in that the device comprises at least one connection end piece connected to means for supplying inert gas, supported by the wedging means of the internal nozzle and intended to be applied by elastic compression members to said supply orifice formed on the external face of the base.

Selon d'autres caractéristiques de l'invention :

  • les moyens de calage de la busette interne sont solidaires de moyens d'échange de la busette externe,
  • ledit au moins embout de connexion est monté coulissant sur lesdits moyens de calage de la busette interne.
  • les organes élastiques de compression sont formés par au moins une lame ressort,
  • les organes élastiques de compression sont formés par au moins un ressort,
  • une rondelle d'étanchéité à base de graphite est interposée entre l'extrémité inférieure de l'embout de connexion et l'orifice d'alimentation,
  • l'extrémité inférieure de l'embout de connexion comporte une surface plane,
  • l'extrémité inférieure de l'embout de connexion comporte un épaulement annulaire,
  • l'extrémité inférieure de l'embout de connexion et l'orifice d'alimentation sont coniques,
  • le boitier métallique comporte au moins une rainure de guidage dudit embout de connexion vers ledit orifice d'alimentation.
According to other characteristics of the invention:
  • the means for wedging the internal nozzle are integral with means for exchanging the external nozzle,
  • said at least connection end piece is slidably mounted on said means for wedging the internal nozzle.
  • the elastic compression members are formed by at least one leaf spring,
  • the elastic compression members are formed by at least one spring,
  • a graphite-based sealing washer is interposed between the lower end of the connection end piece and the supply orifice,
  • the lower end of the connection end piece has a flat surface,
  • the lower end of the connection endpiece has an annular shoulder,
  • the lower end of the connection end piece and the supply orifice are conical,
  • the metal case comprises at least one groove for guiding said connection end piece towards said supply orifice.

D'autres caractéristiques et avantages de l'invention apparaítront au cours de la description qui va suivre, faite en référence aux dessins annexés et sur lesquels :

  • la Fig. 1 est une vue schématique partiellement en coupe verticale d'un tube de coulée de l'acier liquide contenu dans un récipient métallurgique équipé du dispositif d'alimentation en gaz inerte selon l'invention,
  • la Fig. 2 est une vue en coupe verticale de la busette interne du tube de coulée,
  • la Fig. 3 est une vue schématique en coupe verticale et à plus grande échelle d'un embout de connexion du dispositif d'alimentation en gaz inerte selon l'invention,
  • la Fig. 4 est une vue schématique en coupe verticale d'une variante de l'embout de connexion.
Other characteristics and advantages of the invention will become apparent during the description which follows, given with reference to the appended drawings and in which:
  • Fig. 1 is a schematic view partially in vertical section of a pouring tube for the liquid steel contained in a metallurgical container equipped with the device for supplying inert gas according to the invention,
  • Fig. 2 is a view in vertical section of the internal nozzle of the pouring tube,
  • Fig. 3 is a diagrammatic view in vertical section and on a larger scale of a connection end piece of the inert gas supply device according to the invention,
  • Fig. 4 is a schematic view in vertical section of a variant of the connection end piece.

Sur la Fig. 1, on a représenté schématiquement une partie du fond d'un récipient métallurgique 1 de coulée par le bas. In Fig. 1, there is shown schematically part of the bottom of a metallurgical vessel 1 from the bottom.

La paroi de fond 2 est recouverte d'un revêtement interne 3 en matériau réfractaire.The bottom wall 2 is covered with a internal coating 3 of refractory material.

Au-dessous du récipient métallurgique 1 constitué par exemple par un répartiteur, est généralement disposée une lingotière, non représentée, qui est destinée à recevoir l'acier liquide provenant du répartiteur 1.Below the metallurgical vessel 1 consisting for example of a distributor, is generally arranged an ingot mold, not shown, which is intended to receive the liquid steel coming from the distributor 1.

La coulée de l'acier est réalisée par un dispositif qui comporte, notamment dans le sens de coulée de l'acier liquide, une busette interne 10 en matériau réfractaire en appui sur une brique de siège 4 solidaire du fond du répartiteur 1 et une busette externe 11 également en matériau réfractaire située dans l'axe de la busette interne 10.The casting of steel is carried out by a device which comprises, in particular in the direction of casting liquid steel, an internal nozzle 10 made of material refractory bearing on an integral seat brick 4 from the bottom of the distributor 1 and an external nozzle 11 also in refractory material located in the axis of the internal nozzle 10.

La busette interne 10 et la busette externe 11 constituent un tube de coulée de l'acier liquide du répartiteur 1 vers la lingotière et l'entrée de ce tube de coulée forme le col 10a de la busette interne 10.Internal nozzle 10 and external nozzle 11 constitute a pouring tube of the liquid steel of the distributor 1 to the ingot mold and the inlet of this tube of casting forms the neck 10a of the internal nozzle 10.

De manière classique, la busette externe 11 comporte à sa partie supérieure une embase 11a coopérant avec une plaque de référence solidaire de la busette interne 10.Conventionally, the external nozzle 11 has at its upper part a base 11a cooperating with a reference plate secured to the nozzle internal 10.

Le dispositif comporte également des moyens de calage de la busette interne 10 et d'échange de la busette externe 11, ces moyens étant désignés d'une manière générale par la référence 30 sur la figure 1.The device also includes means for setting the internal nozzle 10 and for exchanging the external nozzle 11, these means being designated by a generally by the reference 30 in FIG. 1.

Ces moyens 30 permettent donc de mettre en place la busette interne 10 sur le fond du répartiteur 1 et également de mettre en place et de changer la busette externe 11 en cours de coulée.These means 30 therefore make it possible to places the internal nozzle 10 on the bottom of the distributor 1 and also to set up and change the external nozzle 11 during casting.

Comme représenté à la Fig. 2, la busette interne 10 comporte un corps vertical 15 délimitant un canal de coulée 16 de l'acier liquide et, à sa partie inférieure, une embase 17 servant de plaque de référence et dont la face externe est recouverte d'un boítier métallique 18.As shown in Fig. 2, the nozzle internal 10 has a vertical body 15 defining a runner 16 of the liquid steel and, at its part lower, a base 17 serving as a reference plate and the external face of which is covered with a housing metallic 18.

Ce boítier métallique 18 facilite et fiabilise le positionnement de la busette interne 10 dans les moyens 30 de calage de cette busette interne 10 et d'échange de la busette externe 11.This metal case 18 facilitates and makes reliable the positioning of the internal nozzle 10 in the means 30 for wedging this internal nozzle 10 and exchanging the external nozzle 11.

Le calage de la busette interne 10 est réalisé par exemple par une pièce 35 en forme de fourche qui applique ladite busette interne 10 sur des portées 36.The setting of the internal nozzle 10 is produced for example by a piece 35 in the form of a fork which applies said internal nozzle 10 to spans 36.

La busette interne 10 comporte aussi des moyens de diffusion d'un gaz inerte, comme par exemple de l'argon, dans le canal de coulée 16.The internal nozzle 10 also includes means of diffusion of an inert gas, such as for example of argon, in the runner 16.

Ces moyens de diffusion du gaz inerte servent également à amener ce gaz inerte au niveau du col 10a de la busette interne 10.These inert gas diffusion means are used also to bring this inert gas to the level of the neck 10a of the internal nozzle 10.

Ces moyens de diffusion du gaz inerte sont formés par exemple par une bague cylindrique 19 en matériau poreux disposée dans une gorge 20 ménagée dans le corps vertical 11.These inert gas diffusion means are formed for example by a cylindrical ring 19 in porous material disposed in a groove 20 formed in the vertical body 11.

La paroi interne de la bague cylindrique 19 constitue une portion de longueur du canal de coulée 16 et la gorge 20 est reliée à un dispositif d'alimentation en gaz inerte.The internal wall of the cylindrical ring 19 constitutes a length portion of the runner 16 and the groove 20 is connected to a supply device inert gas.

La busette interne 10 peut également comporter des moyens de diffusion du gaz inerte au niveau de la jointure entre l'embase 17 de la busette interne 10 et l'embase 11a de la busette externe 11.The internal nozzle 10 can also include means for diffusing the inert gas at the level of the joint between the base 17 of the internal nozzle 10 and the base 11a of the external nozzle 11.

Le col 10a de la busette interne 10 peut être également équipé d'une bague cylindrique en matériau poreux, non représenté, pour diffuser le gaz inerte au niveau de ce col.The neck 10a of the internal nozzle 10 can be also equipped with a cylindrical ring made of material porous, not shown, for diffusing the inert gas to the level of this pass.

Ainsi que représenté sur les figures 2 à 4, le dispositif d'alimentation en gaz inerte comprend au moins un orifice d'alimentation 21 situé sur la face externe de l'embase 17 et relié aux moyens de diffusion de ce gaz inerte par au moins un conduit 22 ménagé dans le matériau réfractaire de la busette interne 10.As shown in Figures 2 to 4, the inert gas supply device comprises at minus one supply orifice 21 located on the face external of the base 17 and connected to the diffusion means of this inert gas through at least one conduit 22 formed in the refractory material of the internal nozzle 10.

Le conduit 22 peut déboucher au niveau de la gorge 20 comme représenté à la Fig. 2 et/ou au niveau de la jointure entre l'embase 17 de la busette interne 10 et l'embase 11a de la busette externe 11.The conduit 22 can lead to the level of the groove 20 as shown in FIG. 2 and / or at the joint between the base 17 of the internal nozzle 10 and the base 11a of the external nozzle 11.

Au niveau de l'orifice d'alimentation 21, le boítier métallique 18 comporte un trou 23.At the supply port 21, the metal case 18 has a hole 23.

De préférence, l'orifice d'alimentation 21 est situé sur la face externe supérieure de l'embase 17 de la busette interne 10.Preferably, the supply orifice 21 is located on the upper external face of the base 17 of the internal nozzle 10.

Mais, cet orifice d'alimentation 21 peut également être situé sur la face externe latérale de l'embase 17.However, this supply orifice 21 can also be located on the lateral lateral face of the base 17.

L'orifice d'alimentation 21 est pourvu d'une rondelle d'étanchéité 24 à base de graphite ou à base d'une autre substance pouvant s'écraser.The supply port 21 is provided with a sealing washer 24 based on graphite or based of another substance that can crash.

Ainsi que représenté à la Fig. 3, le dispositif d'alimentation en gaz inerte comprend également au moins un embout de connexion 25 destiné à être appliqué sur la rondelle d'étanchéité 24 de l'orifice d'alimentation 21.As shown in FIG. 3, the device supply of inert gas also includes minus one connection piece 25 intended to be applied on the sealing washer 24 of the supply port 21.

L'embout de connexion 25 est monté coulissant par exemple dans une plaque 26 des moyens de calage de la busette interne 10, ces moyens de calage comprenant la pièce 35.The connection end piece 25 is slidably mounted for example in a plate 26 of the wedging means of the internal nozzle 10, these wedging means comprising Exhibit 35.

Ces moyens de calage peuvent être solidaires des moyens 30 d'échange de la busette externe 11 ou indépendants de ceux-ci.These wedging means can be integral means 30 for exchanging the external nozzle 11 or independent of these.

L'embout de connexion 25, par exemple de section circulaire, comporte un trou borgne 27 qui débouche uniquement sur l'extrémité inférieure de cet embout 25.The connection end piece 25, for example of circular section, has a blind hole 27 which only leads to the lower end of this end cap 25.

Le trou borgne 27 est raccordé par une canalisation 31 et des flexibles, non représentés, au circuit fixe d'alimentation en gaz inerte de l'usine.The blind hole 27 is connected by a pipe 31 and hoses, not shown, at fixed inert gas supply circuit to the factory.

L'embout de connexion 25 est muni à sa partie supérieure d'un chapeau 28 de diamètre supérieur au diamètre de P'embout 25 pour former une butée de façon à empêcher cet embout de sortir de la plaque 26.The connection end piece 25 is provided at its part upper of a cap 28 of diameter greater than diameter of the endpiece 25 to form a stop so preventing this tip from coming out of the plate 26.

Le diamètre du trou 23 du boítier métallique 18 est supérieur au diamètre de l'embout de connexion 25 afin de ne pas gêner son application sur la rondelle d'étanchéité 24 disposée sur l'orifice d'alimentation 21.The diameter of the hole 23 of the metal case 18 is greater than the diameter of the connection piece 25 so as not to interfere with its application on the washer seal 24 arranged on the supply orifice 21.

Pour appliquer l'embout de connexion 25 sur la rondelle d'étanchéité 24 avec un couple donné qui sera toujours identique, cet embout de connexion 25 est relié à des organes élastiques de compression 29.To apply the connection end piece 25 to the sealing washer 24 with a given torque which will be always identical, this connection end piece 25 is connected to elastic compression members 29.

Selon un mode préférentiel de réalisation représenté à la Fig. 3, ces organes élastiques de compression sont formés par au moins une lame ressort 29 dont une extrémité 29a est en appui sur le chapeau 28 de l'embout de connexion 25 et dont l'autre extrémité 29b est fixée sur la plaque support 26 par un organe de fixation connu.According to a preferred embodiment shown in Fig. 3, these elastic members of compression are formed by at least one leaf spring 29 one end of which 29a is supported on the cap 28 of the connection end piece 25 and the other end of which 29b is fixed to the support plate 26 by a known fixation.

Les organes élastiques de compression peuvent également être constitués par au moins un ressort.The elastic compression members can also consist of at least one spring.

L'extrémité inférieure de l'embout de connexion 25 comporte une surface plane et cette surface plane 25a (Fig. 3) peut être pourvue d'un épaulement annulaire (Fig. 4) de telle manière que le contact entre l'embout de connexion 25 et la rondelle d'étanchéité 24 s'effectue selon une génératrice ce qui diminue les risques de fuite du gaz inerte.The lower end of the connection piece 25 has a flat surface and this surface plane 25a (Fig. 3) can be provided with a shoulder annular (Fig. 4) so that the contact between the connection end piece 25 and the sealing washer 24 is carried out according to a generator which reduces the risk of inert gas leakage.

Selon une variante, l'extrémité inférieure de l'embout de connexion 25 et l'orifice d'alimentation 21 peuvent être coniques.Alternatively, the lower end of the connection end piece 25 and the supply orifice 21 can be tapered.

Compte tenu de la différence importante entre la surface de contact de l'extrémité inférieure de l'embout de connexion 25 et la surface de contact de l'orifice d'alimentation 21, un positionnement très précis de cet embout de connexion 25 n'est pas nécessaire pour réaliser la jonction.Considering the significant difference between the contact surface of the lower end of the connection end piece 25 and the contact surface of the supply orifice 21, a very positioning precise of this connector 25 is not necessary to make the junction.

La jonction entre l'embout de connexion 25 et l'orifice d'alimentation 21 est réalisée au moment du positionnement de la busette interne 10 dans les moyens de calage de cette busette interne qui sont solidaires des moyens 30 d'échange de la busette externe 11 ou indépendants de ces moyens d'échange.The junction between the connection end piece 25 and the supply orifice 21 is produced at the time of positioning of the internal nozzle 10 in the means of wedging of this internal nozzle which are integral means 30 for exchanging the external nozzle 11 or independent of these means of exchange.

La plaque 26 avec la canalisation 31, l'embout 25 et les organes élastiques de compression 29 forment un ensemble de connexion du circuit fixe d'alimentation en gaz à l'orifice d'alimentation 21 de la busette interne 10.The plate 26 with the pipe 31, the nozzle 25 and the elastic compression members 29 form a connection assembly of the fixed supply circuit gas to supply port 21 of the internal nozzle 10.

Pour réaliser le montage de la busette interne 10, cet ensemble de connexion est désolidarisé de la pièce 35. Après avoir mis en place la busette interne 10, l'ensemble de connexion précédemment mentionné est amené en position par translation horizontale dans l'intervalle qui sépare le répartiteur 1 des moyens de calage 30.To assemble the nozzle internal 10, this connection assembly is disconnected of part 35. After having installed the nozzle internal 10, the connection assembly previously mentioned is brought into position by horizontal translation in the interval between the distributor 1 and the means timing 30.

Des ergots, non représentés, situés au-dessous de la plaque 26 et des alvéoles, non représentées, sur la partie restante de la pièce 35 permettent par exemple d'affiner la mise en position et un bon calage de la plaque 26.Lugs, not shown, located below of the plate 26 and of the cells, not shown, on the remaining part of the part 35 allow for example to refine the positioning and a good plate timing 26.

D'autre part, des vis, non représentées, permettent d'appliquer ensuite la plaque 26 contre l'autre partie de la pièce 35, ce qui a pour effet de tendre les organes élastiques de compression 29 et donc d'assurer une connexion étanche entre l'embout 25 et l'orifice 21.On the other hand, screws, not shown, then apply the plate 26 against the other part of room 35, which has the effect of tension the elastic compression members 29 and therefore ensure a tight connection between the nozzle 25 and orifice 21.

L'autre extrémité de la canalisation 31 peut être très facilement connectée au circuit fixe d'alimentation en gaz par des moyens classiques. La longueur de la canalisation 31 est déterminée pour que l'accès à son extrémité opposée à l'embout de connexion 25 ne pose aucun problème.The other end of line 31 can be very easily connected to the fixed supply circuit gas by conventional means. The length of line 31 is determined so that access to its end opposite to the connection end piece 25 does not pose no problem.

Les organes élastiques de compression 29 permettent d'appliquer un couple donné toujours rigoureusement identique à chaque jonction.The elastic compression members 29 allow to apply a given torque always rigorously identical to each junction.

Par ailleurs, le boítier métallique 18 peut comporter une rainure de guidage, non représentée, de l'embout de connexion 25 vers l'orifice d'alimentation 21.Furthermore, the metal case 18 can have a guide groove, not shown, of the connection end piece 25 to the supply port 21.

La busette interne 10 peut comporter un ou plusieurs orifices d'alimentation 21 et le dispositif d'alimentation peut comporter un ou plusieurs embouts de connexion 25.The internal nozzle 10 may include one or several supply ports 21 and the device power supply may include one or more end caps connection 25.

Le dispositif d'alimentation en gaz inerte selon l'invention permet de réaliser une connexion automatique entre les moyens de diffusion du gaz inerte de la busette interne avec les circuits fixes d'alimentation du gaz inerte de l'usine.The inert gas supply device according to the invention allows for a connection automatic between the means of diffusion of the inert gas of the internal nozzle with the fixed supply circuits inert gas from the plant.

D'autre part, le dispositif selon l'invention permet de simplifier la fabrication de la busette et du boítier métallique car il n'est plus nécessaire de prévoir des coupleurs et de ce fait de diminuer sensiblement le prix et le coût d'entretien de ces deux éléments.On the other hand, the device according to the invention simplifies the manufacture of the nozzle and the metal housing because it is no longer necessary to provide couplers and thereby significantly decrease the price and the cost of maintenance of these two elements.

De plus, il permet de réduire les fuites de gaz inerte et donc d'augmenter la fiabilité générale de l'installation ce qui constitue un avantage important en terme d'exploitation et en terme de qualité du métal.In addition, it reduces leakage from inert gas and therefore increase the general reliability of installation which is an important advantage in term of exploitation and in terms of quality of the metal.

Enfin, le dispositif selon l'invention est particulièrement intéressant lorsque plusieurs orifices d'alimentation sont prévus. En effet, plus il existe d'orifices d'alimentation, plus la connexion de l'ensemble de ces orifices est facilitée avec le dispositif selon l'invention.Finally, the device according to the invention is particularly interesting when several orifices are planned. Indeed, the more there are supply ports, plus connection of the assembly of these holes is made easier with the device according to the invention.

Claims (9)

  1. A device for feeding inert gas to an internal nozzle (10), of refractory material, for metallurgical vessels (1) for downwards pouring, the internal nozzle (10) comprising:
    a vertical body (15) delimiting a pouring channel for the liquid steel contained in the metallurgical vessel (1),
    at its lower part, a seat (17) whose outer face is covered with a metallic case (18) for adjusting the internal nozzle (10) in means for fixing this internal nozzle (10) on the bottom of the metallurgical vessel (1),
    and means (19; 20) for diffusing the inert gas into the pouring channel (16) and/or at the interface between the said internal nozzle (10) and an external nozzle (11) arranged directly in line with the internal nozzle (10), the said means (19, 20) being fed gas by at least one feed opening (21) which is made in the outer face of the internal nozzle (10) and which is connected to the means (19) for diffusing the inert gas by at least one duct (22) made in the refractory material of the internal nozzle (10), characterised in that the device comprises at least one connection fitting (25) which is connected to means for supplying the inert gas, is supported by means for fixing the internal nozzle (10) and is intended to be applied by elastic compression-elements (29) to the said feed opening (21) made in the outer face of the seat (17).
  2. A device in accordance with Claim 1, characterised in that the means for fixing the internal nozzle (10) are integral with means for exchanging the external nozzle (11).
  3. A device in accordance with Claims 1 and 2, characterised in that the said at least [one] connection fitting (25) is mounted in a sliding manner on the said means for fixing the internal nozzle (10).
  4. A device in accordance with Claim 1, characterised in that the elastic compression-elements (29) are formed by at least one spring leaf.
  5. A device in accordance with Claim 1, characterised in that the elastic compression-elements (29) are formed by at least one spring.
  6. A device in accordance with Claim 1, characterised in that the lower end of the connection fitting (25) comprises a plane surface.
  7. A device in accordance with Claims 1 and 6, characterised in that the lower end of the connection fitting (25) comprises an annular shoulder (25a).
  8. A device in accordance with Claim 1, characterised in that both the lower end of the connection fitting (25) and the feed opening (21) are tapered.
  9. A device in accordance with Claim 1, characterised in that the metallic case (18) comprises at least one groove for guiding the said connection fitting (25) towards the said feed opening (21).
EP95402052A 1994-09-23 1995-09-11 Device for supplying an internal nozzle of a metallurgical vessel with inert gas Expired - Lifetime EP0703028B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411396A FR2724858A1 (en) 1994-09-23 1994-09-23 DEVICE FOR SUPPLYING INERT GAS TO AN INTERNAL NOZZLE FOR METALLURGICAL CONTAINERS
FR9411396 1994-09-23

Publications (2)

Publication Number Publication Date
EP0703028A1 EP0703028A1 (en) 1996-03-27
EP0703028B1 true EP0703028B1 (en) 1999-08-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402052A Expired - Lifetime EP0703028B1 (en) 1994-09-23 1995-09-11 Device for supplying an internal nozzle of a metallurgical vessel with inert gas

Country Status (5)

Country Link
EP (1) EP0703028B1 (en)
AT (1) ATE183423T1 (en)
DE (1) DE69511494T2 (en)
ES (1) ES2136260T3 (en)
FR (1) FR2724858A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2548854A1 (en) * 1975-10-31 1977-05-05 Metacon Ag Refractory brick with a passage opening for liquid metal and the process for its production
US4502670A (en) * 1984-02-02 1985-03-05 Allied Corporation Gas hook-up to a ladle
DE3735546A1 (en) * 1987-10-21 1989-05-03 Didier Werke Ag ARRANGEMENT FOR CONNECTING A METAL PART TO A SHAPED BODY MADE OF REFINERY MATERIAL
DE4223944A1 (en) * 1992-07-21 1994-01-27 Didier Werke Ag Connection of gas feed to flushing brick - using pressure ring which is forced against the internal gas channel under effect of external tension band

Also Published As

Publication number Publication date
DE69511494D1 (en) 1999-09-23
EP0703028A1 (en) 1996-03-27
FR2724858B1 (en) 1997-02-07
ATE183423T1 (en) 1999-09-15
DE69511494T2 (en) 2000-03-23
FR2724858A1 (en) 1996-03-29
ES2136260T3 (en) 1999-11-16

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