WO1998033946A1 - Top hat furnace - Google Patents
Top hat furnace Download PDFInfo
- Publication number
- WO1998033946A1 WO1998033946A1 PCT/EP1998/000246 EP9800246W WO9833946A1 WO 1998033946 A1 WO1998033946 A1 WO 1998033946A1 EP 9800246 W EP9800246 W EP 9800246W WO 9833946 A1 WO9833946 A1 WO 9833946A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cooling
- hood
- air
- air nozzles
- nozzles
- 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.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
- C21D9/667—Multi-station furnaces
- C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
- C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
Definitions
- the invention relates to a hood furnace, in particular for annealing steel sheet coils under protective gas with a protective hood which surrounds the steel sheet coils, with a cooling hood which concentrically surrounds the protective hood to form a space and which has a cooling hood jacket and a cooling hood ceiling, the cooling hood jacket having a plurality is provided by air nozzles such that cooling air strikes the protective hood in the form of prail jets and with at least one fan for generating a cooling air flow in the intermediate space.
- Such hood furnaces are used in particular for bright annealing cold-rolled steel sheets in the form of coils in a protective gas atmosphere.
- a cooling hood is known from WO 95/20058, in which air nozzles are arranged exclusively in the lower third of the height.
- the coils are usually separated by convector plates.
- the volume flows through the convector channels are significantly higher for the lower coils in the stack than for the uppermost coils. From this it follows that underlying coils are preferred for cooling and overhead coils are disadvantaged. This is reinforced by the fact that cooling only takes place in the lower area.
- the cooling process can only be ended when the core of the uppermost coil has the max. Temperature is fallen below, so that the cooling process takes a relatively long time.
- the object is accordingly to develop a hood furnace of the type mentioned in such a way that the cooling is improved, in particular the cooling time is reduced.
- this object is achieved in that the nozzle spacing of the air nozzles increases from bottom to top, the nozzle spacing being 4 to 12 times the nozzle diameter and in addition the cooling hood ceiling is provided with a large number of air nozzles, the nozzle spacing is 4 to 7 times the nozzle diameter. It is structurally particularly simple if the nozzle spacing of the air nozzles of the cooling hood jacket increases continuously from bottom to top.
- the protective gas flow changes direction at the uppermost point of the protective hoods, which means that the turbulence and thus the convective heat transfer to the cooling hood ceiling is significantly greater than that between the protective hood and the cooling hood jacket in the area of the vertical annular gap between the coils and the protective hood.
- the cooling hood ceiling must also be provided with a large number of air nozzles in order to achieve intensive cooling here.
- the solution according to the invention has the advantage that the cooling of the coils is optimized, which shortens the cooling process.
- the drive power of the fan can be relatively low. Accordingly, the noise pollution is comparatively small.
- the hood oven is characterized in that the length of the air nozzles of the cooling hood jacket is 5 to 7 times the nozzle diameter.
- This feature is based on the knowledge that a particularly cooling impact jet occurs when a fully developed tube flow is created in the air nozzles.
- An advantageous embodiment is that the inlet opening of the air nozzles is rounded. This reduces pressure losses.
- the speed of the cooling air in the air nozzles is between approximately 10 to 40 m / s, preferably 15 to 30 m / s.
- the speed of the cooling air in the air nozzles is advantageously at least three times the speed of the flow of the cooling air in the intermediate space.
- the speed of the vertical flow in the intermediate space must be relatively low in order to ensure that the speed of the cooling air in all air nozzles in the cooling hood jacket is as equal as possible.
- the width of the space is therefore chosen to be as large as possible.
- the upper part of the cooling hood can also have a larger outer diameter than the lower part in order to reduce the speed of the flow.
- Figure 1 is a hood top, schematically in longitudinal section.
- FIG. 2 shows a quarter of a top view of a hood furnace according to FIG. 1;
- Fig. 3 shows an air nozzle in detail on a larger scale.
- the cooling hood 2 has a cylindrical cooling hood jacket 4 and a cooling hood cover 5.
- a fan 6 of axial or radial type is arranged on the side of the cooling hood jacket 4.
- the cooling hood jacket 4 is provided with air nozzles 7 over its entire height.
- the lowest row of nozzles is located 300 - 600 mm above the protective hood flange.
- the nozzle distance a from the center of the air nozzle 7 to the center of an adjacent air nozzle 7 increases continuously from bottom to top. It is 4 to 12 times the nozzle diameter d, which is 40 - 100 mm.
- Fig. 2 it is shown that the cooling hood cover 5 is additionally provided with a plurality of air nozzles 7, the nozzle spacing a being 4 to 7 times the nozzle diameter d is.
- the uppermost part of the protective hood 8, which is designed as a dished bottom, is cooled intensively.
- the air nozzles 7 project radially inwards from the cylindrical cooling jacket surface 4.
- the length of the air nozzles 7 is 5 to 7 times the nozzle diameter.
- Fig. 3 it is shown that the inlet openings of the air nozzles are essentially flush and rounded with the outer wall of the cooling hood jacket in order to avoid pressure losses.
- the speed of the cooling air in the air nozzles is between 10 to 40 m / s, preferably 15 to 30 m / s.
- the fan 6 sucks cooling air through the intermediate space 3 and discharges the heated air upwards.
- the inlet opening 9 to the fan 6 in the space 3 between the cooling hood 2 and protective hood 1 is rounded.
- the speed of the vertical flow from bottom to top in the space 3 is relatively low compared to the speed of the cooling air in the air nozzles, which is at least three times the speed of the flow of the cooling air in the space 3.
- the impingement flow from the air nozzles with the cold air drawn in from the surroundings is highly effective for cooling, the cooling effect decreasing from bottom to top.
- the flow of air from the bottom to the top in the space hardly contributes to the cooling process, but only serves to discharge the warming cooling air upwards.
- the upper part of the cooling hood 2 can have a larger outer diameter than the lower part.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Electric Ovens (AREA)
Abstract
Description
Haubeno en Haubeno en
Die Erfindung betrifft einen Haubenofen, insbesondere zum Glühen von Stahlblechbunden unter Schutzgas mit einer Schutzhaube, die die Stahlbiechbunde umgibt, mit einer Kühlhaube, die unter Bildung eines Zwischenraumes die Schutzhaube konzentrisch umgibt und die einen Kühlhaubenmantel und eine Kühlhaubendecke aufweist, wobei der Kühlhaubenmantel mit einer Vielzahl von Luftdüsen versehen ist, derart, daß Kühlluft in Form von Prailstrahlen auf die Schutzhaube auftrifft und mit mindestens einem Ventilator zur Erzeugung einer Kühlluft-Strömung im Zwischenraum.The invention relates to a hood furnace, in particular for annealing steel sheet coils under protective gas with a protective hood which surrounds the steel sheet coils, with a cooling hood which concentrically surrounds the protective hood to form a space and which has a cooling hood jacket and a cooling hood ceiling, the cooling hood jacket having a plurality is provided by air nozzles such that cooling air strikes the protective hood in the form of prail jets and with at least one fan for generating a cooling air flow in the intermediate space.
Derartige Haubenöfen werden insbesondere zum Blankglühen kaltgewalzter Stahlbleche in Form von Bunden sog. Coils in Schutzgasatmosphäre verwendet.Such hood furnaces are used in particular for bright annealing cold-rolled steel sheets in the form of coils in a protective gas atmosphere.
Während des Glühprozesses befindet sich über der Schutzhaube eine Heizhaube. Nach dem Glühen wird die Heizhaube entfernt und durch eine Kühlhaube ersetzt.During the annealing process, there is a heating hood over the protective hood. After the annealing, the heating hood is removed and replaced by a cooling hood.
Aus der WO 95/20058 ist eine Kühihaube bekannt, bei der ausschließlich im unteren Höhendrittel Luftdüsen angeordnet sind. Die Coils stehen üblicherweise durch Konvektorplatten getrennt übereinander. Die Volumenströme durch die Konvektorkanäie sind für die unteren Coils im Stapei deutlich größer als für die obersten Coils. Daraus folgt, daß unterliegende Coils beim Kühlen bevorzugt und oberliegende Coils benachteiligt werden. Dies wird dadurch verstäkrt, daß nur im unteren Bereich eine Kühlung stattfindet. Der Kühiprozess kann erst beendet werden kann, wenn im Kern des obersten Coils die für das Kühlende festgelegte max. Temperatur unterschritten wird, so daß der Kühiprozess reiativ lange dauert.A cooling hood is known from WO 95/20058, in which air nozzles are arranged exclusively in the lower third of the height. The coils are usually separated by convector plates. The volume flows through the convector channels are significantly higher for the lower coils in the stack than for the uppermost coils. From this it follows that underlying coils are preferred for cooling and overhead coils are disadvantaged. This is reinforced by the fact that cooling only takes place in the lower area. The cooling process can only be ended when the core of the uppermost coil has the max. Temperature is fallen below, so that the cooling process takes a relatively long time.
Die Aufgabe besteht demgemäß darin, einen Haubenofen der eingangs genannten Art so weiterzubilden, daß die Kühlung verbessert, insbesondere die Kühldauer verringert wird.The object is accordingly to develop a hood furnace of the type mentioned in such a way that the cooling is improved, in particular the cooling time is reduced.
Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß sich der Düsenabstand der Luftdüsen von unten nach oben vergrößert, wobei der Düsenabstand das 4- bis 12- fache des Düsendurchmessers beträgt und daß zusätzlich die Kühlhaubendecke mit einer Vielzahl von Luftdüsen versehen ist, wobei der Düsenabstand das 4- bis 7-fache des Düsendurchmessers beträgt. Es ist konstruktiv besonders einfach, wenn sich der Düsenabstand der Luftdüsen des Kühlhaubenmantels von unten nach oben kontinuierlich vergrößert.According to the invention, this object is achieved in that the nozzle spacing of the air nozzles increases from bottom to top, the nozzle spacing being 4 to 12 times the nozzle diameter and in addition the cooling hood ceiling is provided with a large number of air nozzles, the nozzle spacing is 4 to 7 times the nozzle diameter. It is structurally particularly simple if the nozzle spacing of the air nozzles of the cooling hood jacket increases continuously from bottom to top.
Es besteht auch die Möglichkeit, den Düsendurchmesser von unten nach oben zu verkleinern. Allerdings ist diese Lösung konstruktiv aufwendig. Der konvektive Wärmeübergang an den Coil-Seitenflächen ist bestimmt durch den Volumenstrom des umgewälzten Schutzgases und dem freien Strömungsquerschnitt des Ringspaites zwischen Schutzhaube und den Coils. Da ein Teii des Schutzgas-Stromes durch die Konvektorplatten über die Coilkanten strömt, wird die für den Wärmeübergang bestimmende Geschwindigkeit des Schutzgases von unten nach oben immer kleiner. Daher wird erfindungsgemäß auch die Kühlwirkung auf die Schutzhaube durch Vergrößerung des Abstandes der Luftdüsen im Kühlhaubenmantel von unten nach oben verringert.There is also the option of reducing the nozzle diameter from bottom to top. However, this solution is structurally complex. The convective heat transfer on the side of the coil is determined by the volume flow of the circulating shielding gas and the free flow cross section of the ring gap between the protective hood and the coils. Since a part of the protective gas flow flows through the convector plates over the coil edges, the speed of the protective gas which determines the heat transfer from bottom to top becomes smaller and smaller. Therefore, according to the invention, the cooling effect on the protective hood is also reduced by increasing the distance between the air nozzles in the cooling hood jacket from bottom to top.
Die Schutzgas-Strömung ändert an der obersten Stelle der Schutzhauben ihre Richtung, wodurch die Turbulenz und damit der konvektive Wärmeübergang zur Kühlhaubendecke deutlich größer ist als derjenige zwischen Schutzhaube und Kühlhaubenmantel im Bereich des vertikalen Ringspalt zwischen Coils und der Schutzhaube. Zusätzlich findet ein nennenswerter Strahlungswärme-Austausch zwischen Schutzhaube und der obersten Coilkante statt. Daher ist zusätzlich die Kühlhaubendecke mit einer Vielzahl von Luftdüsen zu versehen, um hier eine intensive Kühlung zu erreichen.The protective gas flow changes direction at the uppermost point of the protective hoods, which means that the turbulence and thus the convective heat transfer to the cooling hood ceiling is significantly greater than that between the protective hood and the cooling hood jacket in the area of the vertical annular gap between the coils and the protective hood. In addition, there is an appreciable exchange of radiant heat between the protective hood and the top coil edge. Therefore, the cooling hood ceiling must also be provided with a large number of air nozzles in order to achieve intensive cooling here.
Die erfindungsgemäße Lösung hat den Vorteil, daß die Kühlung der Coils optimiert wird, wodurch sich der Kühlprozeß verkürzt.The solution according to the invention has the advantage that the cooling of the coils is optimized, which shortens the cooling process.
Vorteilhaft ist weiterhin, daß die Antriebsleistung des Ventilators relativ gering sein kann. Dementsprechend ist die Lärmbelastung vergleichsweise klein.It is also advantageous that the drive power of the fan can be relatively low. Accordingly, the noise pollution is comparatively small.
Nach einem weiteren Merkmal der Erfindung ist der Haubenofen dadurch gekennzeichnet, daß die Länge der Luftdüsen des Kühlhaubenmantels das 5- bis 7-fache des Düsendurchmessers beträgt.According to a further feature of the invention, the hood oven is characterized in that the length of the air nozzles of the cooling hood jacket is 5 to 7 times the nozzle diameter.
Diesem Merkmal liegt die Erkenntnis zugrunde, daß ein besonders kühlwirksamer Prallstrahl entsteht, wenn in den Luftdüsen eine voll ausgebildete Rohrströmung entsteht.This feature is based on the knowledge that a particularly cooling impact jet occurs when a fully developed tube flow is created in the air nozzles.
Eine vorteilhafte Ausgestaltung besteht darin, daß die Eintrittsöffnung der Luftdüsen abgerundet ist. Dadurch werden Druckverluste verringert.An advantageous embodiment is that the inlet opening of the air nozzles is rounded. This reduces pressure losses.
Nach einem weiteren Merkmal der Erfindung beträgt die Geschwindigkeit der Kühlluft in den Luftdüsen zwischen ca. 10 bis 40 m/s, vorzugsweise 15 bis 30 m/s. Vorteilhafterweise beträgt die Geschwindigkeit der Kühlluft in den Luftdüsen mindestens das 3fache der Geschwindigkeit der Strömung der Kühlluft im Zwischenraum. Die Geschwindigkeit der vertikalen Strömung im Zwischenraum muß relativ klein sein, um zu erreichen, daß die Geschwindigkeit der Kühlluft in allen Luftdüsen im Kühlhaubenmantel möglichst gleich groß ist. Die Breite des Zwischenraums wird daher so groß wie möglich gewählt. Der obere Teil der Kühlhaube kann außerdem einen größeren Außendurchmesser aufweisen, als der untere Teil, um die Geschwindigkeit der Strömung zu reduzieren.According to a further feature of the invention, the speed of the cooling air in the air nozzles is between approximately 10 to 40 m / s, preferably 15 to 30 m / s. The speed of the cooling air in the air nozzles is advantageously at least three times the speed of the flow of the cooling air in the intermediate space. The speed of the vertical flow in the intermediate space must be relatively low in order to ensure that the speed of the cooling air in all air nozzles in the cooling hood jacket is as equal as possible. The width of the space is therefore chosen to be as large as possible. The upper part of the cooling hood can also have a larger outer diameter than the lower part in order to reduce the speed of the flow.
Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispieis im Zusammenhang mit der beiliegenden Zeichnung näher erläutert.The invention is explained in more detail below on the basis of a preferred exemplary embodiment in conjunction with the accompanying drawing.
Die Zeichnung zeigt in,The drawing shows in,
Fig. 1 einen Haubenoben, schematisch im Längsschnitt;Figure 1 is a hood top, schematically in longitudinal section.
Fig. 2 ein Viertel einer Draufsicht auf einen Haubenofen nach Fig. 1 ;FIG. 2 shows a quarter of a top view of a hood furnace according to FIG. 1;
Fig. 3 eine Luftdüse im Detaii in einem größeren Maßstab.Fig. 3 shows an air nozzle in detail on a larger scale.
In dem Haubenofen nach Fig. 1 werden unter einer Schutzhaube 1 nicht dargestellte Stahlblechbunde unter Schutzgas geglüht. Die dabei über die Schutzhaube gestülpte Heizhaube ist ebenfalls nicht dargestellt. Nach Beendigung des Glühprozesses wird die Heizhaube durch eine Kühlhaube 2 ersetzt, die unter Bildung eines Zwischenraumes 3 die Schutzhaube 1 konzentrisch umgibt.In the hood furnace according to FIG. 1, coils of steel, not shown, are annealed under protective gas under a protective hood 1. The heating hood placed over the protective hood is also not shown. After the annealing process has ended, the heating hood is replaced by a cooling hood 2, which concentrically surrounds the protective hood 1 to form an intermediate space 3.
Die Kühlhaube 2 weist einen zylindrischen Kühlhaubenmantel 4 und eine Kühlhaubendecke 5 auf. An dem Kühlhaubenmantel 4 ist seitlich ein Ventilator 6 axialer oder radialer Bauart angeordnet.The cooling hood 2 has a cylindrical cooling hood jacket 4 and a cooling hood cover 5. A fan 6 of axial or radial type is arranged on the side of the cooling hood jacket 4.
Der Kühlhaubenmantel 4 ist über seine gesamte Höhe mit Luftdüsen 7 versehen. Die unterste Düsenreihe ist 300 - 600 mm über dem Schutzhauben-Flansch angebracht. Der Düsenabstand a von Mitte Luftdüse 7 zur Mitte einer benachbarten Luftdüse 7 vergrößert sich von unten nach oben kontinuierlich. Er beträgt das 4- bis 12-fache des Düsendurchmessers d, der 40 - 100 mm beträgt.The cooling hood jacket 4 is provided with air nozzles 7 over its entire height. The lowest row of nozzles is located 300 - 600 mm above the protective hood flange. The nozzle distance a from the center of the air nozzle 7 to the center of an adjacent air nozzle 7 increases continuously from bottom to top. It is 4 to 12 times the nozzle diameter d, which is 40 - 100 mm.
In Fig. 2 ist dargestellt, daß zusätzlich die Kühlhaubendecke 5 mit einer Vielzahl von Luftdüsen 7 versehen ist, wobei der Düsenabstand a das 4- bis 7-fache des Düsen- durchmessers d beträgt. Dadurch wird der als Klöpperboden ausgebildete oberste Teil der Schutzhaube 8 intensiv gekühlt.In Fig. 2 it is shown that the cooling hood cover 5 is additionally provided with a plurality of air nozzles 7, the nozzle spacing a being 4 to 7 times the nozzle diameter d is. As a result, the uppermost part of the protective hood 8, which is designed as a dished bottom, is cooled intensively.
Die Luftdüsen 7 ragen von der zylindrischen Kühlmantelfläche 4 aus radial nach innen. Die Länge der Luftdüsen 7 beträgt das 5- bis 7-fache des Düsendurchmessers. In Fig. 3 ist dargestellt, daß die Eintrittsöffnungen der Luftdüsen mit der Außenwand des Kühlhaubenmantels im wesentlichen bündig und abgerundet sind, um Druckveriuste zu vermeiden.The air nozzles 7 project radially inwards from the cylindrical cooling jacket surface 4. The length of the air nozzles 7 is 5 to 7 times the nozzle diameter. In Fig. 3 it is shown that the inlet openings of the air nozzles are essentially flush and rounded with the outer wall of the cooling hood jacket in order to avoid pressure losses.
Die Geschwindigkeit der Kühlluft in den Luftdüsen beträgt zwischen 10 bis 40 m/s, vorzugsweise 15 bis 30 m/s.The speed of the cooling air in the air nozzles is between 10 to 40 m / s, preferably 15 to 30 m / s.
Der Ventilator 6 saugt Kühlluft durch den Zwischenraum 3 und führt die erwärmte Luft nach oben ab. Die Einlauföffnung 9 zum Ventilator 6 im Zwischenraum 3 zwischen Kühlhaube 2 und Schutzhaube 1 ist abgerundet. Die Geschwindigkeit der vertikalen Strömung von unten nach oben im Zwischenraum 3 ist relativ klein, verglichen mit der Geschwindigkeit der Kühlluft in den Luftdüsen, die mindestens das dreifache der Geschwindigkeit der Strömung der Kühlluft im Zwischenraum 3 beträgt.The fan 6 sucks cooling air through the intermediate space 3 and discharges the heated air upwards. The inlet opening 9 to the fan 6 in the space 3 between the cooling hood 2 and protective hood 1 is rounded. The speed of the vertical flow from bottom to top in the space 3 is relatively low compared to the speed of the cooling air in the air nozzles, which is at least three times the speed of the flow of the cooling air in the space 3.
Die Prallströmung aus den Luftdüsen mit der aus der Umgebung angesaugten kalten Luft ist für die Kühlung hochwirksam, wobei die Kühlwirkung von unten nach oben abnimmt. Die Strömung der Luft von unten nach oben im Zwischenraum trägt kaum zum Kühlprozeß bei, sondern dient lediglich dazu, die sich erwärmende Kühlluft nach oben abzuführen.The impingement flow from the air nozzles with the cold air drawn in from the surroundings is highly effective for cooling, the cooling effect decreasing from bottom to top. The flow of air from the bottom to the top in the space hardly contributes to the cooling process, but only serves to discharge the warming cooling air upwards.
Im Rahmen der Erfindung sind ohne weiteres Abwandlungsmöglichkeiteπ gegeben. So kann der obere Teii der Kühlhaube 2 einen größeren Außendurchmesser aufweisen, als der untere Teil. Within the scope of the invention, there are further possible modifications. Thus, the upper part of the cooling hood 2 can have a larger outer diameter than the lower part.
Claims
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR9805962-9A BR9805962A (en) | 1997-01-30 | 1998-01-17 | Oven with cover. |
| EA199800880A EA000962B1 (en) | 1997-01-30 | 1998-01-17 | Top hat furnace |
| JP10532491A JP2000508716A (en) | 1997-01-30 | 1998-01-17 | Batch annealing furnace |
| AT98904091T ATE217651T1 (en) | 1997-01-30 | 1998-01-17 | HOOD FURNACE |
| EP98904091A EP0894150B1 (en) | 1997-01-30 | 1998-01-17 | Top hat furnace |
| US09/161,600 US6177044B1 (en) | 1997-01-30 | 1998-09-25 | Bell-shaped furnace |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19703305 | 1997-01-30 | ||
| DE19703305.9 | 1997-01-30 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/161,600 Continuation-In-Part US6177044B1 (en) | 1997-01-30 | 1998-09-25 | Bell-shaped furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998033946A1 true WO1998033946A1 (en) | 1998-08-06 |
Family
ID=7818731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1998/000246 Ceased WO1998033946A1 (en) | 1997-01-30 | 1998-01-17 | Top hat furnace |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0894150B1 (en) |
| JP (1) | JP2000508716A (en) |
| AT (1) | ATE217651T1 (en) |
| BR (1) | BR9805962A (en) |
| DE (1) | DE19803259B4 (en) |
| EA (1) | EA000962B1 (en) |
| WO (1) | WO1998033946A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1048742A2 (en) | 1999-04-26 | 2000-11-02 | Drever International S.A. | Device for cooling materials |
| US6346214B1 (en) * | 1998-10-14 | 2002-02-12 | Otto Junker Gmbh | Top hat furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3433433C1 (en) * | 1984-09-12 | 1985-10-24 | Otto Junker Gmbh, 5107 Simmerath | Device for heating or cooling metallic goods |
| DE3824415A1 (en) * | 1988-07-19 | 1990-01-25 | Gottfried Von Czarnowski | Cooling hood for rapid cooling of red-hot material, in particular steel strip |
| AT396525B (en) * | 1992-03-20 | 1993-10-25 | Ebner Ind Ofenbau | Device for cooling the charge-protecting cover of annealing furnaces |
| US5290017A (en) * | 1993-03-01 | 1994-03-01 | Indugas, Inc. | Cooling cover for batch coil annealing furnace |
| WO1995020058A1 (en) * | 1994-01-20 | 1995-07-27 | Ebner-Industrieofenbau Gesellschaft Mbh | Device for cooling the charge protection lid of annealing furnaces |
-
1998
- 1998-01-17 BR BR9805962-9A patent/BR9805962A/en active Search and Examination
- 1998-01-17 WO PCT/EP1998/000246 patent/WO1998033946A1/en not_active Ceased
- 1998-01-17 EA EA199800880A patent/EA000962B1/en not_active IP Right Cessation
- 1998-01-17 JP JP10532491A patent/JP2000508716A/en active Pending
- 1998-01-17 EP EP98904091A patent/EP0894150B1/en not_active Expired - Lifetime
- 1998-01-17 AT AT98904091T patent/ATE217651T1/en not_active IP Right Cessation
- 1998-01-29 DE DE19803259A patent/DE19803259B4/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3433433C1 (en) * | 1984-09-12 | 1985-10-24 | Otto Junker Gmbh, 5107 Simmerath | Device for heating or cooling metallic goods |
| DE3824415A1 (en) * | 1988-07-19 | 1990-01-25 | Gottfried Von Czarnowski | Cooling hood for rapid cooling of red-hot material, in particular steel strip |
| AT396525B (en) * | 1992-03-20 | 1993-10-25 | Ebner Ind Ofenbau | Device for cooling the charge-protecting cover of annealing furnaces |
| US5290017A (en) * | 1993-03-01 | 1994-03-01 | Indugas, Inc. | Cooling cover for batch coil annealing furnace |
| WO1995020058A1 (en) * | 1994-01-20 | 1995-07-27 | Ebner-Industrieofenbau Gesellschaft Mbh | Device for cooling the charge protection lid of annealing furnaces |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6346214B1 (en) * | 1998-10-14 | 2002-02-12 | Otto Junker Gmbh | Top hat furnace |
| EP1048742A2 (en) | 1999-04-26 | 2000-11-02 | Drever International S.A. | Device for cooling materials |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE217651T1 (en) | 2002-06-15 |
| BR9805962A (en) | 2000-01-25 |
| DE19803259A1 (en) | 1998-08-06 |
| DE19803259B4 (en) | 2006-10-12 |
| EP0894150A1 (en) | 1999-02-03 |
| EA199800880A1 (en) | 1999-04-29 |
| EP0894150B1 (en) | 2002-05-15 |
| EA000962B1 (en) | 2000-08-28 |
| JP2000508716A (en) | 2000-07-11 |
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