EP0148337B1 - Gas flushing plug for metallurgical vessels - Google Patents

Gas flushing plug for metallurgical vessels Download PDF

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Publication number
EP0148337B1
EP0148337B1 EP84112404A EP84112404A EP0148337B1 EP 0148337 B1 EP0148337 B1 EP 0148337B1 EP 84112404 A EP84112404 A EP 84112404A EP 84112404 A EP84112404 A EP 84112404A EP 0148337 B1 EP0148337 B1 EP 0148337B1
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EP
European Patent Office
Prior art keywords
gas
section
supply pipe
gas supply
metal cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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EP84112404A
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German (de)
French (fr)
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EP0148337A1 (en
Inventor
Hans Dipl.-Ing. Höffgen
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RADEX DEUTSCHLAND AKTIENGESELLSCHAFT FUER FEUERFES
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Brohltal-Deumag AG fur Feuerfeste Erzeugnisse
RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE
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Application filed by Brohltal-Deumag AG fur Feuerfeste Erzeugnisse, RADEX DEUTSCHLAND AG fur FEUERFESTE ERZEUGNISSE filed Critical Brohltal-Deumag AG fur Feuerfeste Erzeugnisse
Priority to AT84112404T priority Critical patent/ATE26859T1/en
Publication of EP0148337A1 publication Critical patent/EP0148337A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the invention relates to a gas purging plug for metallurgical vessels consisting of a porous, gas-permeable molded block made of refractory material, a gas-tight partial casing surrounding it, which is welded together from a sheet metal jacket extending around the lateral peripheral surface of the molded block and a sheet metal cover covering the outer end face of the molded block, one Gas supply pipe, which is welded to the edge of a central gas inlet opening of the sheet metal cover, and a break-through protection in the area of the gas supply pipe.
  • Gas purging stones of the type mentioned which can be inserted into the bottom or the side walls of the vessels, are used for blowing inert gases into the melt to be treated.
  • the inert gas treatment offers various metallurgical advantages, for example the reduction of the temperature profile in the pan and thus a quick setting of the optimal casting temperature, a homogeneous distribution of the alloying agent or deoxidizing agent in the vessel, improvement of the degree of purity of the steel by transporting the non-metallic impurities, in the slag and partial removal of gases, stirring aid in metallurgical reactions to achieve concentration compensation of the melt and the like.
  • gas purging stones are preprogrammed wear parts
  • the gas purging stone technology is already so advanced that a single stone survives a larger number of batches.
  • the wear of the stones occurs primarily on the gas outlet side in contact with the melt. It can often be observed that melt enters the pores and clogs them in such a way that the outlet area of the flushing block is closed and so-called flushing misfires can occur.
  • the invention has for its object to prevent the gas purging plug from being blocked in the gas outlet area and thus to ensure that it is ready for purging.
  • this object is achieved in that a narrow cross section is provided in the gas supply pipe at a distance from the gas inlet opening of the sheet metal cover and in that a closure body which is movable at least in the axial direction of the gas supply pipe and whose cross section is smaller is arranged in the pipe section between the sheet metal cover and the narrowed cross section than the inner diameter of the gas supply pipe and larger than the narrowed cross section, the closure body 'forms a check valve together with the narrowed cross section.
  • the check valve closes immediately after the flushing process has ended, so that there is no pressure drop in the flushing plug and thus the melt does not penetrate into the pores of the flushing plug after the flushing process has ended.
  • the check valve also acts as a breakthrough protection.
  • the resistance of the purge material is strengthened, to which in particular the pressure gas cushion formed in the gas purge contributes. Due to the construction according to the invention, complex breakthrough safeguards can thus be dispensed with.
  • the valve body which is relatively large and can fill almost the entire free cross section of the gas supply pipe, is preferably made of copper. Copper is a material that can absorb large amounts of heat in a short time. If a melt breakthrough should occur in spite of the construction according to the invention, the melt penetrating into the gas supply pipe solidifies immediately upon contact with the closure body made of copper, so that an additional breakdown protection is thereby created.
  • the narrowed cross section provided in the gas supply pipe can be formed by a perforated disc, the central through opening of which forms the valve seat. Such a valve seat can be produced with little effort.
  • the pipe section between the sheet metal cover and the perforated disk and also the perforated disk can be made of stainless steel.
  • a compression spring can be provided between the closure body and the sheet metal cover, which presses the closure body against the valve seat. This measure ensures that the sink can be used in any position.
  • a sieve can be arranged in the area of the gas inlet opening of the sheet metal cover or somewhat below it, so that no refractory material that may crumble out of the sink material can get into the area of the valve seat.
  • the sieve can be in an annular perforated cap welded into the inner cross section of the gas supply pipe be attached, which can also be used as an abutment for the compression spring.
  • the valve body can be designed as a ball, which can best close the passage through the narrowed cross section.
  • the closure body as a solid, cylindrical part, the diameter of which is only slightly smaller than the inside diameter of the gas supply pipe and which on its side interacting with the narrowed cross section of the gas supply pipe has a tapering end piece which engages in the narrowed cross section.
  • the end piece is expediently frustoconical.
  • the cylindrical closure body can be equipped with a large, good heat-conducting mass, so that a spontaneous quenching effect of the penetrating melt is achieved in the event of a melt breakthrough, an additional seal being created by the melt solidified in the region of the closure body.
  • a central recess is expediently provided in the end face of the end of the cylindrical closure part facing away from the narrowed cross section, as a result of which the heat-conducting contact surface is enlarged compared to a possible penetrating melt and the quenching effect is thus further improved.
  • a ring made of refractory material can be arranged around the gas supply pipe, the outer diameter of which is expediently larger than the largest diameter of the shaped block and the ring with an axially projecting edge which overlaps the wider end of the shaped block on a perforated brick or the vessel lining can be applied.
  • the gas purging plug 1 consists of a frustoconical, gas-permeable molded block 2 which is inserted into the bottom or the wall of a metallurgical vessel not shown in the drawing.
  • a flushing gas for example argon, is introduced through the gas purging plug into the metal melt located in the metallurgical vessel.
  • the gas purging plug is a wearing part, which is replaced by a new gas purging plug after a certain number of batches.
  • the gas purging plug 1 is partially provided with a gas-tight sheet metal casing 3.
  • This consists of a tightly fitting sheet metal jacket 4 and a round sheet metal cover 6 which bears against the outer end face 5 of the shaped block and extends to the outer edge of the end face 5 of the shaped block.
  • the outer edge of the sheet metal jacket 4 is flanged around the sheet metal cover 6 and connected to the sheet metal cover in a gas-tight manner by a weld seam 7 which runs at a distance from the edge of the sheet metal cover 6.
  • the sheet metal cover 6 has a round gas inlet opening 8, which is provided with an axially projecting cylindrical edge 9.
  • a gas feed pipe 10 is inserted into the gas inlet opening 8 provided with the cylindrical edge 9, on the outer circumference of which the edge 9 of the gas inlet opening 8 is welded over a circumferential seam 11.
  • a narrowed cross section 12 is provided at a distance from the gas inlet opening 8 of the sheet metal cover 6, which is formed by a perforated disk 13.
  • the gas supply pipe 10 is of split design and consists of a first section 14 which is welded to the sheet metal cover 6 and a second section 15 adjoining it, to which the gas supply is connected.
  • the perforated disk 13 is inserted between the two pipe sections 14 and 15, and all three parts are connected to one another by a common circumferential weld seam 16.
  • the pipe section 14 adjoining the sheet metal cover 6 and the perforated disk 13 are made of rustproof stainless steel, so that in the interior of the pipe section 14, which is to serve as the valve receiving housing and valve seat, no troublesome corrosion can occur.
  • a relatively large copper ball 17 is used as the valve body, which is only slightly smaller than the inner cross section of the tube section 14. Together with the perforated disk 13, the ball 17 forms a check valve.
  • the ball 17 is lifted off the valve seat by the flushing gas flowing in via the second pipe section 15, so that the valve in the direction of flow of the flushing gas represents little or no resistance. If, on the other hand, the purge gas flow is interrupted, the valve is closed so that no pressure reduction can occur in the interior of the purge block.
  • the copper ball 17 is acted upon by a helical compression spring 18 . to that the ball 17 can be pressed specifically into its breech position.
  • the turns of the spring 18 extend close to the inner wall of the tube section 14 so that the spring 18 is guided through the tube.
  • This sink construction with compression spring is also suitable for inserting the sink in inclined or vertical vessel walls.
  • a sieve 19 is arranged in the pipe section 14, which is intended to prevent that disturbing particles get into the valve chamber, so that the valve seat always remains clean and thus ready for operation.
  • the sieve 19 is seated in a perforated cap 20 which is welded into the inner cross section of the tube section 14.
  • the perforated cap 20 also serves as an abutment for the compression spring 18 on the side facing away from the valve seat.
  • the gas purging plug 21 shown in FIG. 2 largely corresponds to the embodiment shown in FIG. 1, so that the same reference numerals have been used for the same parts.
  • the gas purging plug 21 consists of a frustoconical, gas-permeable molded block 2 with a sheet metal casing 3 which is welded together from a closely fitting sheet metal jacket 4 and a round sheet metal cover 6.
  • the provided in the sheet metal cover 6 central gas inlet opening 8 is formed by a round punch, the diameter of which is smaller than the inside diameter of the gas supply pipe 10.
  • the upper section 14 of the gas supply pipe 10 is welded directly to the underside of the sheet metal cover 6 via a weld seam 22, so that the edge of the metal cover 6 surrounding the gas inlet opening 8 projects into the cross section of the gas supply pipe 10.
  • a narrowed cross section 12 is provided in the interior of the gas supply pipe 10 at a distance from the gas inlet opening 8 of the sheet metal cover 6, which is formed by a perforated disk 13. This is welded between the two pipe sections 14 and 15, which form the gas supply pipe 10.
  • the closure body 24, which is arranged in the interior of the upper tube section 14, is designed as a solid, cylindrical part 25, the diameter of which is only slightly smaller than the inside diameter of the gas supply tube 10.
  • the cylindrical part 25 On its side facing the narrowed cross section 12 the cylindrical part 25 is provided with a frustoconical end piece 26 which engages in the perforated disc 13 and forms a tight seal when it lies on it.
  • This closure body 24, which mainly acts by its own weight, can only be used with gas purging stones 21 which are inserted into the bottom of a metallurgical vessel, the gas supply pipe 10 occupying a vertical position.
  • the closure body 24 In its upper end face 27, the closure body 24 is provided with a central recess 28 which is designed as a cylindrical depression.
  • the recess 28 has the task of enlarging the surface of the cylindrical part 25, which is preferably made of copper, so that the melt can solidify immediately in the event of a melt breakthrough.
  • a ring 29 made of refractory material is arranged around the gas supply pipe 10 as an additional breakdown protection.
  • the outer diameter of the ring 29 is larger than the largest diameter of the shaped block 2, so that the ring projects laterally beyond the shaped block.
  • the ring 29 is provided with an edge 30 which extends in the axial direction and which engages over the wider end of the shaped block 2 and lies against the underside of a perforated block 31.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A gas bubble brick for metallurgical vessels consists of a porous, gas-permeable shaped brick (2) made of refractory material, a gas-tight partial encasing surrounding the latter, which encasing is welded together from a metal jacket (4) extending around the lateral circumferential area of the shaped brick and a metal cover (6) covering the outer face of the shaped brick, a gas supply pipe (10) which is welded to the rim of a central gas inlet orifice (8) of the metal cover (6), as well as a break-through safeguard in the area of the gas supply pipe. In order to prevent closure of the gas bubble brick in the gas outlet area and in order thereby to ensure purge readiness, a constricted cross-section (12) is provided inside the gas supply pipe (10) at a distance from the gas inlet orifice (8) of the metal cover (6), there being provided in the pipe section between the metal cover and the constricted cross-section a closure body (17), which is movable at least in the axial direction of the gas supply pipe and is, for example, a copper ball or the like, the cross-section of which is smaller than the inside diameter of the gas supply pipe (10) and greater than the constricted cross-section (12). The closure body (17), together with the constricted cross-section (12), thereby forms a non-return valve, which prevents a pressure drop occurring in the gas bubble brick after switching off the gas supply.

Description

Die Erfindung betrifft einen Gasspülstein für metallurgische Gefäße bestehend aus einem porösen, gasdurchlässigen Formstein aus feuerfestem Material, einer diesen umgebenden gasdichten Teilumkleidung, die aus einem sich um die seitliche Umfangsfläche des Formsteins erstreckenden Blechmantel und einem die äußere Stirnfläche des Formsteins überdeckenden Blechdeckel zusammengeschweißt ist, einem Gaszuführungsrohr, das an den Rand einer mittigen Gaseintrittsöffnung des Blechdeckels angeschweißt ist, sowie einer Durchbruchsicherung im Bereich des Gaszuführungsrohrs.The invention relates to a gas purging plug for metallurgical vessels consisting of a porous, gas-permeable molded block made of refractory material, a gas-tight partial casing surrounding it, which is welded together from a sheet metal jacket extending around the lateral peripheral surface of the molded block and a sheet metal cover covering the outer end face of the molded block, one Gas supply pipe, which is welded to the edge of a central gas inlet opening of the sheet metal cover, and a break-through protection in the area of the gas supply pipe.

Gasspülsteine der genannten Art, die in den Boden oder die Seitenwände der Gefäße eingesetzt werden können, dienen zum Einblasen von Inertgasen in die zu behandelnde Schmelze. Die Inertgasbehandlung bietet verschiedene metallurgische Vorteile, beispielsweise den Abbau des Temperaturprofils in der Pfanne und damit eine schnelle Einstellung der optimalen Gießtemperatur, eine homogene Verteilung der Legierungsmittel bzw. der Desoxydationsmittel, in dem Gefäß, Verbesserung des Reinheitsgrades des Stahles durch Transport der nichtmetallischen Verunreinigungen, in die Schlacke sowie teilweises Entfernen von Gasen, Rührhilfe bei metallurgischen Reaktionen zur Erreichung des Konzentrationsausgleiches der Schmelze und dergleichen mehr.Gas purging stones of the type mentioned, which can be inserted into the bottom or the side walls of the vessels, are used for blowing inert gases into the melt to be treated. The inert gas treatment offers various metallurgical advantages, for example the reduction of the temperature profile in the pan and thus a quick setting of the optimal casting temperature, a homogeneous distribution of the alloying agent or deoxidizing agent in the vessel, improvement of the degree of purity of the steel by transporting the non-metallic impurities, in the slag and partial removal of gases, stirring aid in metallurgical reactions to achieve concentration compensation of the melt and the like.

Gasspülsteine sind zwar vorprogrammierte Verschleißteile, jedoch ist die Gasspülsteintechnik bereits soweit fortgeschritten, daß ein einziger Stein eine größere Anzahl von Chargen übersteht. Der Verschleiß der Steine tritt in erster Linie an der mit der Schmelze in Berührung befindlichen Gasaustrittsseite auf. Häufig ist zu beobachten, daß Schmelze in die Poren eintritt und diese derart verstopft, daß der Austrittsbereich des Spülsteins verschlossen wird und somit sogenannte Spülaussetzer auftreten können.Although gas purging stones are preprogrammed wear parts, the gas purging stone technology is already so advanced that a single stone survives a larger number of batches. The wear of the stones occurs primarily on the gas outlet side in contact with the melt. It can often be observed that melt enters the pores and clogs them in such a way that the outlet area of the flushing block is closed and so-called flushing misfires can occur.

Der Erfindung liegt die Aufgabe zugrunde, einen Verschluß der Gasspülsteine im Gasaustrittsbereich zu verhindern und damit die Spülbereitschaft sicherzustellen.The invention has for its object to prevent the gas purging plug from being blocked in the gas outlet area and thus to ensure that it is ready for purging.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß in dem Gaszuführungsrohr in einem Abstand von der Gaseintrittsöffnung des Blechdeckels ein verengter Querschnitt vorgesehen ist und daß in dem Rohrabschnitt zwischen dem Blechdeckel und dem verengten Querschnitt ein zumindest in Axialrichtung des Gaszuführungsrohrs beweglicher Verschlußkörper angeordnet ist, dessen querschnitt kleiner als der Innendurchmesser des Gaszuführungsrohres und größer als der verengte querschnitt ist, wobei der Verschlußkörper' zusammen mit dem Verengten Querschnitt ein Rückschlagventil bildet.According to the invention, this object is achieved in that a narrow cross section is provided in the gas supply pipe at a distance from the gas inlet opening of the sheet metal cover and in that a closure body which is movable at least in the axial direction of the gas supply pipe and whose cross section is smaller is arranged in the pipe section between the sheet metal cover and the narrowed cross section than the inner diameter of the gas supply pipe and larger than the narrowed cross section, the closure body 'forms a check valve together with the narrowed cross section.

Durch die erfindungsgemäße Konstruktion verschließt sich das Rückschlagventil unmittelbar nach Beendigung des Spülvorgangs, so daß kein Druckabfall in dem Spülstein auftritt und somit `6 die Schmelze nicht nach Beendigung des Spülvorgangs in die Poren des Spülsteins eindringt.Due to the construction according to the invention, the check valve closes immediately after the flushing process has ended, so that there is no pressure drop in the flushing plug and thus the melt does not penetrate into the pores of the flushing plug after the flushing process has ended.

Nachdem die Inertgaszufuhr zu dem Spülstein unterbrochen wird, kann sogar ein Druckanstieg in dem Gasspülstein durch die Erwärmung und die damit verbundene Ausdehnung des Restgases auftreten, so daß nicht nur der Verschlußkörper in seine Schließstellung gedrückt, sondern auch ein sicherer Schutz gegen eindringende Schmelze in die Poren des Spülsteins geschaffen wird.After the inert gas supply to the purging stone is interrupted, even a pressure increase in the gas purging stone can occur due to the heating and the associated expansion of the residual gas, so that not only the closure body is pressed into its closed position, but also a reliable protection against penetrating melt into the pores the sink is created.

Darüber hinaus wirkt das Rückschlagventil zusätzlich als Durchbruchsicherung. Durch die Verhinderung des Druckabfalls in den Gasdurchgängen des Spülsteins nach Abschaltung der Gaszufuhr wird die Widerstandsfähigkeit des Spülsteinmaterials gestärkt, wozu insbesondere das in dem Gasspülstein entstehende Druckgaspolster beiträgt. Durch die erfindungsgemäße Konstruktion kann somit auf aufwendige Durchbruchsicherungen verzichtet werden.In addition, the check valve also acts as a breakthrough protection. By preventing the pressure drop in the gas passages of the purge after the gas supply has been switched off, the resistance of the purge material is strengthened, to which in particular the pressure gas cushion formed in the gas purge contributes. Due to the construction according to the invention, complex breakthrough safeguards can thus be dispensed with.

Vorzugsweise besteht der Ventilkörper, der relativ groß ausgeführt ist und nahezu den gesamten freien Querschnitt des Gaszuführungsrohrs ausfüllen kann, aus Kupfer. Kupfer ist ein Material, welches in kurzer Zeit große Wärmemengen aufnehmen kann. Wenn es trotz der erfindungsgemäßen Konstruktion einmal zu einem Schmelzendurchbruch kommen sollte, so erstarrt die in das Gaszuführungsrohr eindringende Schmelze sofort bei Berührung mit dem aus Kupfer bestehenden Verschlußkörper, so daß dadurch eine zusätzliche Durchbruchsicherung geschaffen wird.The valve body, which is relatively large and can fill almost the entire free cross section of the gas supply pipe, is preferably made of copper. Copper is a material that can absorb large amounts of heat in a short time. If a melt breakthrough should occur in spite of the construction according to the invention, the melt penetrating into the gas supply pipe solidifies immediately upon contact with the closure body made of copper, so that an additional breakdown protection is thereby created.

Der in dem Gaszuführungsrohr vorgesehene verengte Querschnitt kann durch eine Lochscheibe gebildet sein, deren mittige Durchgangsöffnung den Ventilsitz bildet. Ein solcher Ventilsitz ist mit geringem Aufwand Teicht herstellbar.The narrowed cross section provided in the gas supply pipe can be formed by a perforated disc, the central through opening of which forms the valve seat. Such a valve seat can be produced with little effort.

Um zu gewährleisten, daß der als Ventilteil dienende Abschnitt des Gaszuführungsrohrs auch über längere Zeiten funktionstüchtig bleibt, können der Rohrabschnitt zwischen dem Blechdeckel und der Lochscheibe sowie auch die Lochscheibe aus nichtrostendem Stahl bestehen.In order to ensure that the section of the gas supply pipe serving as a valve part remains functional even over long periods, the pipe section between the sheet metal cover and the perforated disk and also the perforated disk can be made of stainless steel.

Ferner kann zwischen dem Verschlußkörper und dem Blechdeckel eine Druckfeder vorgesehen sein, die den Verschlußkörper gegen den Ventilsitz drückt. Durch diese Maßnahme ist gewährleistet, daß der Spülstein in jeder beliebigen Lage verwendet werden kann.Furthermore, a compression spring can be provided between the closure body and the sheet metal cover, which presses the closure body against the valve seat. This measure ensures that the sink can be used in any position.

In dem Bereich der Gaseintrittsöffnung des Blechdeckels oder etwas unterhalb davon kann ein Sieb angeordnet sein, damit keine Feuerfestmasse, die eventuell aus dem Spülsteinmaterial herausbröckelt, in den Bereich des Ventilsitzes gelangen kann.A sieve can be arranged in the area of the gas inlet opening of the sheet metal cover or somewhat below it, so that no refractory material that may crumble out of the sink material can get into the area of the valve seat.

Das Sieb kann in einer in dem inneren Querschnitt des Gaszuführungsrohrs eingeschweißten ringförmigen Lochkappe befestigt sein, die gleichzeitig als Widerlager für die Druckfeder verwendet werden kann.The sieve can be in an annular perforated cap welded into the inner cross section of the gas supply pipe be attached, which can also be used as an abutment for the compression spring.

Der Ventilkörper kann als Kugel ausgebildet sein, die den Durchgang durch den verengten Querschnitt bestens verschließen kann.The valve body can be designed as a ball, which can best close the passage through the narrowed cross section.

Alternativ ist es auch möglich, den Verschlußkörper als massives, zylindrisches Teil auszubilden, dessen Durchmesser nur wenig kleiner ist als der Innendurchmesser des Gaszuführungsrohrs und der auf seiner mit dem verengten Querschnitt des Gaszuführungsrohrs zusammenwirkenden Seite ein sich verjüngendes, in den verengten Querschnitt eingreifendes Endstück aufweist. Das Endstück ist zweckmäßig kegelstumpfförmig ausgebildet. Der zylindrische Verschlußkörper kann mit einer großen, gut wärmeleitenden Masse ausgestattet sein, so daß bei einem, eventuellen Schmelzendurchbruch eine spontane Abschreckwirkung der eindringenden Schmelze erzielt wird, wobei durch die im Bereich des Verschlußkörpers erstarrte Schmelze eine zusätzliche Abdichtung entsteht.Alternatively, it is also possible to design the closure body as a solid, cylindrical part, the diameter of which is only slightly smaller than the inside diameter of the gas supply pipe and which on its side interacting with the narrowed cross section of the gas supply pipe has a tapering end piece which engages in the narrowed cross section. The end piece is expediently frustoconical. The cylindrical closure body can be equipped with a large, good heat-conducting mass, so that a spontaneous quenching effect of the penetrating melt is achieved in the event of a melt breakthrough, an additional seal being created by the melt solidified in the region of the closure body.

Zweckmäßig ist in der Stirnfläche des dem verengten Querschnitt abgewandten Endes des zylindrischen Verschlußteils eine mittige Ausnehmung vorgesehen, wodurch die wärmeleitende Angriffsfläche gegenüber einer eventuellen eindringenden Schmelze vergrößert und somit die Abschreckwirkung noch verbessert wird.A central recess is expediently provided in the end face of the end of the cylindrical closure part facing away from the narrowed cross section, as a result of which the heat-conducting contact surface is enlarged compared to a possible penetrating melt and the quenching effect is thus further improved.

Als zusätzliche Durchbruchsicherung kann um das Gaszuführungsrohr herum ein Ring aus feuerfestem Material angeordnet sein, wobei dessen Außendurchmesser zweckmäßig größer als der größte Durchmesser des Formsteins ist und der Ring mit einem in Axialrichtung vorspringenden Rand, der das breitere Ende des Formsteins übergreift, an einem Lochstein bzw. der Gefäßausmauerung anlegbar ist.As an additional breakdown protection, a ring made of refractory material can be arranged around the gas supply pipe, the outer diameter of which is expediently larger than the largest diameter of the shaped block and the ring with an axially projecting edge which overlaps the wider end of the shaped block on a perforated brick or the vessel lining can be applied.

Die Erfindung ist in der Zeichnung beispielsweise veranschaulicht und im nachstehenden im einzelnen anhand der Zeichnung beschrieben. Es zeigen:

  • Fig. 1 einen Schnitt durch ein Ausführungsbeispiel eines Gasspülsteins und
  • Fig. 2 einen Schnitt durch ein anderes Ausführungsbeispiel eines Gasspülsteins.
The invention is illustrated in the drawing, for example, and described in detail below with reference to the drawing. Show it:
  • Fig. 1 shows a section through an embodiment of a gas purging plug and
  • Fig. 2 shows a section through another embodiment of a gas purging plug.

Nach Fig. 1 der Zeichnung besteht der Gasspülstein 1 aus einem kegelstumpfförmigen, gasdurchlässigen Formstein 2, der in den Boden bzw. die Wand eines in der Zeichnung nicht dargestellten metallurgischen Gefäßes eingesetzt wird. Durch den Gasspülstein wird ein Spülgas, beispielsweise Argon, in die in dem metallurgischen Gefäß befindliche Metallschmelze eingeleitet. Der Gasspülstein ist ein Verschleißteil, welches nach einer bestimmten Anzahl von Chargen durch einen neuen Gasspülstein ersetzt wird.According to Fig. 1 of the drawing, the gas purging plug 1 consists of a frustoconical, gas-permeable molded block 2 which is inserted into the bottom or the wall of a metallurgical vessel not shown in the drawing. A flushing gas, for example argon, is introduced through the gas purging plug into the metal melt located in the metallurgical vessel. The gas purging plug is a wearing part, which is replaced by a new gas purging plug after a certain number of batches.

Der Gasspülstein 1 ist zum Teil mit einer gasdichten Blechumkleidung 3 versehen. Diese besteht aus einem eng anliegenden Blechmantel 4 sowie einem an der äußeren Stirnfläche 5 des Formsteins anliegenden runden Blechdeckel 6, der sich bis an den äußeren Rand der Stirnfläche 5 des Formsteins erstreckt. Der äußere Rand des Blechmantels 4 ist um den Blechdeckel 6 herumgebördelt und durch eine Schweißnaht 7, die in einem Abstand vom Rand des Blechdeckels 6 verläuft, gasdicht mit dem Blechdeckel verbunden.The gas purging plug 1 is partially provided with a gas-tight sheet metal casing 3. This consists of a tightly fitting sheet metal jacket 4 and a round sheet metal cover 6 which bears against the outer end face 5 of the shaped block and extends to the outer edge of the end face 5 of the shaped block. The outer edge of the sheet metal jacket 4 is flanged around the sheet metal cover 6 and connected to the sheet metal cover in a gas-tight manner by a weld seam 7 which runs at a distance from the edge of the sheet metal cover 6.

In seiner Mitte weist der Blechdeckel 6 eine runde Gaseintrittsöffnung 8 auf, die mit einem axial vorspringenden zylindrischen Rand 9 versehen ist. In die mit dem zylindrischen Rand 9 versehene Gaseintrittsöffnung 8 ist ein Gaszuführungsrohr 10 eingesteckt, an dessen äußeren Umfang der Rand 9 der Gaseintrittsöffnung 8 über eine rundumlaufende Naht 11 langeschweißt ist.In the middle, the sheet metal cover 6 has a round gas inlet opening 8, which is provided with an axially projecting cylindrical edge 9. A gas feed pipe 10 is inserted into the gas inlet opening 8 provided with the cylindrical edge 9, on the outer circumference of which the edge 9 of the gas inlet opening 8 is welded over a circumferential seam 11.

Im Inneren des Gaszuführungsrohrs 10 ist in einem Abstand von der Gaseintrittsöffnung 8 des Blechdeckels 6 ein verengter querschnitt 12 vorgesehen, der durch eine Lochscheibe 13 gebildet wird. Zum Anbringen der Lochscheibe 13 ist das Gaszuführungsrohr 10 geteilt ausgebildet und besteht aus einem ersten Abschnitt 14, der an den Blechdeckel 6 angeschweißt ist und einem zweiten sich daran anschließenden Abschnitt 15, an den die Gaszufuhr angeschlossen wird. Zwischen die beiden Rohrabschnitte 14 und 15 ist die Lochscheibe 13 eingelegt, und mit einer gemeinsamen umlaufenden Schweißnaht 16 sind alle drei Teile miteinander verbunden.In the interior of the gas supply pipe 10, a narrowed cross section 12 is provided at a distance from the gas inlet opening 8 of the sheet metal cover 6, which is formed by a perforated disk 13. To attach the perforated disk 13, the gas supply pipe 10 is of split design and consists of a first section 14 which is welded to the sheet metal cover 6 and a second section 15 adjoining it, to which the gas supply is connected. The perforated disk 13 is inserted between the two pipe sections 14 and 15, and all three parts are connected to one another by a common circumferential weld seam 16.

Der sich an den Blechdeckel 6 anschließende Rohrabschnitt 14 sowie die Lochscheibe 13 sind aus nichtrostendem Edelstahl hergestellt, so daß in dem Innenraum des Rohrabschnitts 14, der als Ventilaufnahmegehäuse und Ventilsitz dienen soll, keine störende Korrosion auftreten kann.The pipe section 14 adjoining the sheet metal cover 6 and the perforated disk 13 are made of rustproof stainless steel, so that in the interior of the pipe section 14, which is to serve as the valve receiving housing and valve seat, no troublesome corrosion can occur.

Als Ventilkörper dient eine relativ große Kupferkugel 17, die nur wenig kleiner als der innere querschnitt des Rohrabschnitts 14 ist. Gemeinsam mit der Lochscheibe 13 bildet die Kugel 17 ein Rückschlagventil.A relatively large copper ball 17 is used as the valve body, which is only slightly smaller than the inner cross section of the tube section 14. Together with the perforated disk 13, the ball 17 forms a check valve.

Die Kugel 17 wird durch das über den zweiten Rohrabschnitt 15 heranströmende Spülgas von dem Ventilsitz abgehoben, so daß das Ventil in Strömungsrichtung des Spülgases keinen oder nur einen geringen Widerstand darstellt. Wenn dagegen der Spülgaszustrom unterbrochen wird, so wird das Ventil verschlossen, so daß sich kein Druckabbau im Inneren des Spülsteins einstellen kann.The ball 17 is lifted off the valve seat by the flushing gas flowing in via the second pipe section 15, so that the valve in the direction of flow of the flushing gas represents little or no resistance. If, on the other hand, the purge gas flow is interrupted, the valve is closed so that no pressure reduction can occur in the interior of the purge block.

Zur Verbesserung der Verschlußwirkung ist die Kupferkugel 17 mit einer schraubenlinienförmigen Druckfeder 18 beaufschlagt,.to,daß die Kugel 17 gezielt in ihre Verschlußpoeition gedrückt werden kann. Die Windungen der Feder 18 reichen bis nahe an die Innenwand des Rohrabschnitts 14 heran, so daß die Feder 18 durch das Rohr geführt ist. Diese Spülsteinkonstruktion mit Druckfeder eignet sich auch für das Einsetzen des Spülsteins in schräge oder auch vertikale Gefäßwände.To improve the locking effect, the copper ball 17 is acted upon by a helical compression spring 18 . to that the ball 17 can be pressed specifically into its breech position. The turns of the spring 18 extend close to the inner wall of the tube section 14 so that the spring 18 is guided through the tube. This sink construction with compression spring is also suitable for inserting the sink in inclined or vertical vessel walls.

In einem geringem Abstand von der Stirnfläche 5 des Formsteins 2 ist in dem Rohrabschnitt 14 ein Sieb 19 angeordnet, welches verhindern soll, daß störende Partikel in den Ventilraum gelangen, so daß der Ventilsitz stets sauber und somit funktionsbereit bleibt. Das Sieb 19 sitzt in einer Lochkappe 20, die in den inneren querschnitt des Rohrabschnitts 14 eingeschweißt ist. Die Lochkappe 20 dient gleichzeitig auf der dem Ventilsitz abgewandten Seite als Widerlager für die Druckfeder 18.At a short distance from the end face 5 of the shaped block 2, a sieve 19 is arranged in the pipe section 14, which is intended to prevent that disturbing particles get into the valve chamber, so that the valve seat always remains clean and thus ready for operation. The sieve 19 is seated in a perforated cap 20 which is welded into the inner cross section of the tube section 14. The perforated cap 20 also serves as an abutment for the compression spring 18 on the side facing away from the valve seat.

Der in Fig. 2 dargestellte Gasspülstein 21 entspricht weitestgehend der in Fig. 1 dargestellten Ausführungsform, so daß für gleiche Teile gleiche Bezugszeichen verwendet worden sind.The gas purging plug 21 shown in FIG. 2 largely corresponds to the embodiment shown in FIG. 1, so that the same reference numerals have been used for the same parts.

Auch bei diesem zweiten Ausführungsbeispiel besteht der Gasspülstein 21 aus einem kegelstumpfförmigen, gasdurchlässigen Formstein 2 mit einer Blechumkleidung 3, die aus einem eng anliegenden Blechmantel 4 sowie einem runden Blechdeckel 6 zusammengeschweißt ist. Die in dem Blechdeckel 6 vorgesehene zentrische Gaseintrittsöffnung 8 ist durch eine runde Ausstanzung gebildet, deren Durchmesser kleiner ist als der Innendurchmesser des Gaszuführungsrohrs 10. Der obere Abschnitt 14 des Gaszuführungsrohrs 10 ist über eine Schweißnaht 22 unmittelbar an die Unterseite des Blechdeckels 6 angeschweißt, so daß der die Gaseintrittsöffnung 8 umgebende Rand des Blechdeckels 6 in den Querschnitt des Gaszuführungsrohrs 10 hineinragt.In this second exemplary embodiment too, the gas purging plug 21 consists of a frustoconical, gas-permeable molded block 2 with a sheet metal casing 3 which is welded together from a closely fitting sheet metal jacket 4 and a round sheet metal cover 6. The provided in the sheet metal cover 6 central gas inlet opening 8 is formed by a round punch, the diameter of which is smaller than the inside diameter of the gas supply pipe 10. The upper section 14 of the gas supply pipe 10 is welded directly to the underside of the sheet metal cover 6 via a weld seam 22, so that the edge of the metal cover 6 surrounding the gas inlet opening 8 projects into the cross section of the gas supply pipe 10.

Auch bei diesem Ausführungsbeispiel ist im Innern des Gaszuführungsrohrs 10 in einem Abstand von der Gaseintrittsöffnung 8 des Blechdeckels 6 ein verengter Querschnitt 12 vorgesehen, der durch eine Lochscheibe 13 gebildet wird. Diese ist zwischen die beiden Rohrabschnitte 14 und 15, die das Gaszuführugsrohr 10 bilden, eingeschweißt.In this exemplary embodiment, too, a narrowed cross section 12 is provided in the interior of the gas supply pipe 10 at a distance from the gas inlet opening 8 of the sheet metal cover 6, which is formed by a perforated disk 13. This is welded between the two pipe sections 14 and 15, which form the gas supply pipe 10.

Im Gegensatz zu dem ersten Ausführungsbeispiel ist der Verschlußkörper 24, der im Inneren des oberen Rohrabschnitts 14 angeordnet ist, als massives, zylindrisches Teil 25 ausgebildet, dessen Durchmesser nur wenig kleiner ist als der Innendurchmesser des Gaszuführungsrohrs 10. Auf seiner dem verengten Querschnitt 12 zugewandten Seite ist das zylindrische Teil 25 mit einem kegelstumpfförmigen Endstück 26 versehen, das in die Lochscheibe 13 eingreift und beim Aufliegen einen dichten Verschluß bildet. Dieser Verschlußkörper 24, der vorwiegend durch sein Eigengewicht wirkt, ist nur bei Gasspülsteinen 21 anwendbar, die in den Boden eines metallurgischen Gefäßes eingesetzt werden, wobei das Gaszuführungsrohr 10 eine vertikale Position einnimmt.In contrast to the first exemplary embodiment, the closure body 24, which is arranged in the interior of the upper tube section 14, is designed as a solid, cylindrical part 25, the diameter of which is only slightly smaller than the inside diameter of the gas supply tube 10. On its side facing the narrowed cross section 12 the cylindrical part 25 is provided with a frustoconical end piece 26 which engages in the perforated disc 13 and forms a tight seal when it lies on it. This closure body 24, which mainly acts by its own weight, can only be used with gas purging stones 21 which are inserted into the bottom of a metallurgical vessel, the gas supply pipe 10 occupying a vertical position.

In seiner oberen Stirnfläche 27 ist der Verschlußkörper 24 mit einer mittigen Ausnehmung 28 versehen, die als zylindrische Einsenkung ausgebildet ist. Die Ausnehmung 28 hat die Aufgabe, bei dem vorzugsweise aus Kupfer bestehenden zylindrischen Teil 25 die Oberfläche zu vergrößern, so daß bei einem eventuellen Schmelzendurchbruch eine sofortige Erstarrung der Schmelze erfolgen kann.In its upper end face 27, the closure body 24 is provided with a central recess 28 which is designed as a cylindrical depression. The recess 28 has the task of enlarging the surface of the cylindrical part 25, which is preferably made of copper, so that the melt can solidify immediately in the event of a melt breakthrough.

Als zusätzliche Durchbruchsicherung ist um das Gaszuführungsrohr 10 herum ein Ring 29 aus feuerfestem Material angeordnet. Der Außendurchmesser des Rings 29 ist dabei größer als der größte Durchmesser des Formsteins 2, so daß der Ring seitlich über den Formstein hinaus vorsteht. In diesem vorspringenden Bereich ist der Ring 29 mit einem sich in Axialrichtung erstreckenden Rand 30 versehen, der das breitere Ende des Formsteins 2 übergreift und an der Unterseite eines Lochsteins 31 anliegt.A ring 29 made of refractory material is arranged around the gas supply pipe 10 as an additional breakdown protection. The outer diameter of the ring 29 is larger than the largest diameter of the shaped block 2, so that the ring projects laterally beyond the shaped block. In this projecting area, the ring 29 is provided with an edge 30 which extends in the axial direction and which engages over the wider end of the shaped block 2 and lies against the underside of a perforated block 31.

Claims (14)

1. Gas bubble brick for metallurgical vessels consisting of a porous, gas-permeable shaped brick made of refractory material, a gas-tight partial encasing surrounding the latter, which encasing is welded together from a metal jacket extending around the lateral circumferential area of the shaped brick and a metal cover covering the outer face of the shaped brick, a gas supply pipe which is welded to the rim of a central gas inlet orifice of the metal cover, as well as a breakthrough safeguard in the area of the gas supply pipe, characterised in that a constricted cross-section (12) is provided in the gas supply pipe (10) at a distance from the gas inlet orifice (8) of the metal cover (6), and in that there is provided in the pipe section (14) between the metal cover (6) and the constricted cross-section (12) a closure body (17; 24), which is movable at least in the axial direction of the gas supply pipe (10) and the cross-section of which is smaller than the inside diameter of the gas supply pipe (10) and greater than the constricted cross-section (12), the closure body (17; 24), together with the constricted cross-section (12), forming a non- return valve.
2. Gas bubble brick according to Claim 1, characterised in that the closure body (17; 24) is made of copper.
3. Gas bubble brick according to Claim 1 or 2, characterised in that the constricted cross-section is formed by a perforated disc (13), the central aperture (12) of which forms the valve seat.
4. Gas bubble brick according to one of claims 1 to 3, characterised in that the pipe section (14) between the metal cover (6) and the perforated disc (13) and the perforated disc (13) are made of stainless steel.
5. Gas bubble brick according to one of claims 1 to 4, characterised in that a compression spring (18), which presses the closure body (17) against the valve seat (12), is provided between the closure body (17) and the metal cover (6).
6. Gas bubble brick according to one of claims 1 to 5, characterised in that a screen (19) is arranged in the area of the gas inlet orifice (8) of the metal cover (6) or somewhat underneath it.
7. Gas bubble brick according to Claim 6, characterised in that the screen (19) is fixed in an annular perforated cap (20) welded into the inside cross-section of the gas supply pipe (10).
8. Gas bubble brick according to Claim 7, characterised in that the perforated cap (20) is designed as a counter-bearing for the compression spring (18).
9. Gas bubble brick according to one of claims 1 to 8, characterised in that the closure body (17) is a ball.
10. Gas bubble brick according to one of claims 1 to 8, characterised in that the closure body (24) is a solid, cylindrical part, the diameter of which is only a little smaller than the inside diameter of the gas supply pipe (10) and which has on its side interacting with the constricted cross-section (12) of the gas supply pipe (10) a tapering end piece (26) engaging in the constricted cross-section (12).
11. Gas bubble brick according to Claim 10, characterised in that the tapering end piece (26) is designed as a truncated cone.
12. Gas bubble brick according to Claim 10 or 11, characterised in that a central recess (28) is provided in the face (27) of the end of the cylindrical part (25) remote from the constricted cross-section (12).
13. Gas bubble brick according to one of claims 1 to 12, characterised in that a ring (29) made of refractory material is arranged around the gas supply pipe (10).
14. Gas bubble brick according to Claim 13, characterised in that the outside diameter of the ring (29) is larger than the largest diameter of the shaped brick (2) and in that the ring (29) is attachable to a perforated brick (31) or the vessel masonry by means of a rim (30) protruding in the axial direction and engaging over the broader end of the shaped brick (2).
EP84112404A 1983-11-17 1984-10-15 Gas flushing plug for metallurgical vessels Expired EP0148337B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84112404T ATE26859T1 (en) 1983-11-17 1984-10-15 GAS FLUSH STONE FOR METALLURGICAL VESSELS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3341446A DE3341446C1 (en) 1983-11-17 1983-11-17 Gas flushing stone for metallurgical vessels
DE3341446 1983-11-17

Publications (2)

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EP0148337A1 EP0148337A1 (en) 1985-07-17
EP0148337B1 true EP0148337B1 (en) 1987-04-29

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EP84112404A Expired EP0148337B1 (en) 1983-11-17 1984-10-15 Gas flushing plug for metallurgical vessels

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US (1) US4616809A (en)
EP (1) EP0148337B1 (en)
JP (1) JPS60116711A (en)
AT (1) ATE26859T1 (en)
CA (1) CA1230480A (en)
DE (2) DE3341446C1 (en)

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Also Published As

Publication number Publication date
ATE26859T1 (en) 1987-05-15
JPS60116711A (en) 1985-06-24
CA1230480A (en) 1987-12-22
US4616809A (en) 1986-10-14
EP0148337A1 (en) 1985-07-17
DE3463397D1 (en) 1987-06-04
DE3341446C1 (en) 1985-07-11

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