EP0167921B1 - Flat spray nozzle for cooling of continuously conveyed cast strands in a continuous casting plant - Google Patents

Flat spray nozzle for cooling of continuously conveyed cast strands in a continuous casting plant Download PDF

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Publication number
EP0167921B1
EP0167921B1 EP85107858A EP85107858A EP0167921B1 EP 0167921 B1 EP0167921 B1 EP 0167921B1 EP 85107858 A EP85107858 A EP 85107858A EP 85107858 A EP85107858 A EP 85107858A EP 0167921 B1 EP0167921 B1 EP 0167921B1
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EP
European Patent Office
Prior art keywords
jet nozzle
flat jet
coolant
cooling
exit slot
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
Application number
EP85107858A
Other languages
German (de)
French (fr)
Other versions
EP0167921A3 (en
EP0167921A2 (en
Inventor
Horst Grothe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT85107858T priority Critical patent/ATE33775T1/en
Publication of EP0167921A2 publication Critical patent/EP0167921A2/en
Publication of EP0167921A3 publication Critical patent/EP0167921A3/en
Application granted granted Critical
Publication of EP0167921B1 publication Critical patent/EP0167921B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/267—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being deflected in determined directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like

Definitions

  • the invention relates to a flat jet nozzle in a continuous casting installation for spraying a coolant onto a casting strand surface, the outlet slot of which forms a spray fan formed from a multiplicity of coolant jets, the angles of incidence associated with each coolant jet becoming smaller with respect to the side regions of the casting strand surface.
  • a coolant jet striking the side surfaces of the casting strand strikes the strand surface with less kinetic energy due to its twice as large path than a water jet striking the middle of the strand perpendicularly.
  • Both the smaller angle of incidence and the loss of energy additionally reduce the cooling effect of a certain amount of coolant, since they reduce the depth of penetration of the water drops into the vapor layer formed on the strand surface.
  • a nozzle which has a plurality of parallel nozzle channels arranged next to one another in one plane and having the same or different diameters. All nozzle channels are connected in the mouth area by a transverse channel with parallel boundary surfaces.
  • the object of the invention is to provide a simple spray nozzle for cooling casting strands in a wide spray fan formed from a plurality of coolant jets, the different heat dissipation resulting from different angles of incidence and throw lengths of the coolant jets being compensated for.
  • the outlet slot can extend in front of an impact surface in the circumferential direction of the flat jet nozzle.
  • the outlet slot can be arranged parallel to the inflow opening on the side of the flat jet nozzle.
  • a particularly inexpensive embodiment of the flat jet nozzle is seen in the fact that the outlet slot is partially formed by a cover placed on a side bore of the flat jet nozzle, which is fastened by a bolt penetrating the side bore.
  • a T-shaped mixing fitting 1 is provided with a connecting nipple 2, 3 each for an air supply line and a water supply line.
  • a nozzle tube 4, to which a flat jet nozzle 5 is connected, is screwed in on an outlet side of the mixer fitting 1.
  • the flat jet nozzle 5 is provided with an inlet opening 6 and a side bore 7 at right angles thereto, the lower wall 8 of which acts as an impact surface.
  • the side bore 7 is provided with a cover 9, which is fastened to the opposite wall of the flat jet nozzle 5 by a bolt 10 penetrating the side bore 7.
  • the lower wall 8 of the flat jet nozzle 5 is to form an outlet slot 11 on the side of the Cover 9 angularly excluded.
  • a flat jet nozzle 13 screwed to a nozzle tube 12 is provided with an outlet slot 15 in its wall immediately in front of an impact surface 14 on the end face.
  • the coolant is sprayed through the outlet slots 11, 15 of the flat jet nozzle 5 or 13 in a fan 16 onto a casting strand surface 17, with individual coolant jets of the spray fan 16 having different angles of incidence a, a 2 .
  • different amounts of coolant 0 are defined for the width regions depending on the angle of incidence a.
  • the associated area of the outlet slot 11, 15 is defined in terms of its width according to the required coolant quantities Q. It can be seen from FIGS. 1 to 4 that the width of the outlet slots 11, 15 increases from the center to the sides. In this way, the outer regions of a cast strand surface 17 are subjected to a larger quantity of coolant Q in an increasingly defined manner to the outside (FIG. 5).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Nozzles (AREA)

Abstract

A flat jet nozzle for spraying coolant on a continuously conveyed billet with a wide angle spray along the width of the billet is formed with a cylindrical wall having a discharge slot extending in the circumferential direction of the cylindrical wall, with the slot having a width which increases from the middle of the slot toward the outer sides thereof.

Description

Die Erfindung betrifft eine Flachstrahldüse in einer Stranggießanlage zum Aufsprühen eines Kühlmittels auf eine Gießstrangoberfläche, deren Austrittsschlitz einen aus einer Vielzahl von Kühlmittelstrahlen gebildeten Sprühfächer formt, wobei die jedem Kühlmittelstrahl zugeordneten Auftreffwinkel zu den Seitenbereichen der Gießstrangoberfläche kleiner werden.The invention relates to a flat jet nozzle in a continuous casting installation for spraying a coolant onto a casting strand surface, the outlet slot of which forms a spray fan formed from a multiplicity of coolant jets, the angles of incidence associated with each coolant jet becoming smaller with respect to the side regions of the casting strand surface.

Bei einer derartigen durch die DE-A-2 401 649 bekannt gewordenen Sprühdüse ist ein gleichmäßiger Längsschlitz in einem zylindrischen Düsenkörper quer zu dessen Längsachse angeordnet, wodurch ein den Sprühfächer bestimmender Öffnungswinkel von 70°-130° gebildet ist. Mit der bekannten Sprühdüse ist eine gleichmäßige Kühlmittelbeaufschlagung und Wärmeabfuhr über eine große Strangbreite aus folgenden Gründen nicht erreichbar:In the case of such a spray nozzle, which has become known from DE-A-2 401 649, a uniform longitudinal slot is arranged in a cylindrical nozzle body transversely to its longitudinal axis, as a result of which an opening angle of 70 ° -130 ° defining the spray fan is formed. With the known spray nozzle, uniform application of coolant and heat dissipation over a large strand width cannot be achieved for the following reasons:

Die Auftreffwinkel der Kühlmittelstrahlen gehen von der Mitte des Gießstranges von 90° zu den Seiten des Gießstranges auf bis zu 30° zurück. Daraus folgt zunächst eine Ausdehnung des von einem Kühlmittelstrahl bestimmter Breite getroffenen Flächenbereichs mit abnehmenden Auftreffwinkeln. (Streuung)The angles of incidence of the coolant jets decrease from the center of the casting strand from 90 ° to the sides of the casting strand up to 30 °. This initially results in an expansion of the surface area hit by a certain width of coolant with decreasing angles of incidence. (Scattering)

Hinzukommt, daß ein auf die Seitenflächen des Gießstranges auftreffender Kühlmittelstrahl aufgrund seines doppelt so großen Weges mit geringerer kinetischer Energie auf die Strangoberfläche auftrifft als ein senkrecht auf die Strangmitte auftreffender Wasserstrahl. Sowohl der kleinere Auftreffwinkel als auch der Energieverlust verringern die Kühlwirkung einer bestimmten Kühlmittelmenge zusätzlich, da sie die Eindringtiefe der Wassertropfen in die auf der Strangoberfläche gebildete Dampfschicht vermindern.In addition, a coolant jet striking the side surfaces of the casting strand strikes the strand surface with less kinetic energy due to its twice as large path than a water jet striking the middle of the strand perpendicularly. Both the smaller angle of incidence and the loss of energy additionally reduce the cooling effect of a certain amount of coolant, since they reduce the depth of penetration of the water drops into the vapor layer formed on the strand surface.

Durch die DE-A-2 501 293 ist eine Düse bekannt, die mehrere in einer Ebene nebeneinander angeordnete parallele Düsenkanäle mit gleichen oder unterschiedlichen Durchmessern aufweist. Alle Düsenkanäle sind im Mündungsbereich durch einen Querkanal mit parallelen Begrenzungsflächen verbunden.From DE-A-2 501 293 a nozzle is known which has a plurality of parallel nozzle channels arranged next to one another in one plane and having the same or different diameters. All nozzle channels are connected in the mouth area by a transverse channel with parallel boundary surfaces.

Diese Sprühdüse ist im Aufbau kompliziert und kostspielig und wegen der Verstopfungsgefahr der Düsenkanäle nicht betriebssicher. Innerhalb der zueinander parallelen Düsenkanäle werden gebündelte Kühlmittelstrahlen erzeugt, die wegen fehlender Ablenkungsflächen geradlinig durch den Querkanal gehen und ohne Fächerbildung senkrecht auf die Strangoberfläche treffen. Eine Beeinflussung der Kühlmenge innerhalb eines Sprühfächers kann auf diese Weise nicht stattfinden.The structure of this spray nozzle is complicated and costly, and it is not reliable because of the risk of clogging of the nozzle channels. Bundled coolant jets are generated within the nozzle channels which are parallel to one another and, due to the lack of deflection surfaces, run straight through the transverse channel and hit the strand surface perpendicularly without fan formation. The cooling quantity within a spray fan cannot be influenced in this way.

Aufgabe der Erfindung ist die Schaffung einer einfachen Sprühdüse zum Abkühlen von Gießsträngen in einem breiten aus einer Vielzahl von Kühlmittelstrahlen gebildeten Sprühfächer, wobei sich die aus unterschiedlichen Auftreffwinkeln und Wurflängen der Kühlmittelstrahlen ergebende unterschiedliche Wärmeabfuhr ausgeglichen wird.The object of the invention is to provide a simple spray nozzle for cooling casting strands in a wide spray fan formed from a plurality of coolant jets, the different heat dissipation resulting from different angles of incidence and throw lengths of the coolant jets being compensated for.

Diese Aufgabe wird erfindungsgemäß bei einer Flachstrahldüse der obigen Gattung dadurch gelöst, daß die Breite des Austrittsschlitzes von seiner Mitte zu seinen Seiten hin zunimmt.This object is achieved in a flat jet nozzle of the above type in that the width of the outlet slot increases from its center to its sides.

Dabei erfolgt die genaue Dimensionierung der Zunahme der Schlitzbreite zu den Seiten mittels bekannter Kontrollen wie z. B. getrenntes Auffangen und Messen von auf bestimmte Breitenbereiche niedergehenden Kühlmittelmengen und/oder Temperaturmessung der Breitenbereiche der Strangoberfläche nach Durchlaufen des Sprühbereichs der Düse.The exact dimensioning of the increase in the slot width to the sides takes place by means of known controls such as e.g. B. separate collection and measurement of cooling medium quantities falling to certain width ranges and / or temperature measurement of the width ranges of the strand surface after passing through the spraying area of the nozzle.

Auf diese Weise wird das Gefüge und die Oberflächenqualität des Gießstranges verbessert und eine optimale Ausnutzung des Kühlmittels erreicht.In this way, the structure and the surface quality of the cast strand are improved and optimal use of the coolant is achieved.

Der Austrittsschlitz kann sich vor einer Prallfläche in Umfangsrichtung des Flachstrahldüse erstrecken.The outlet slot can extend in front of an impact surface in the circumferential direction of the flat jet nozzle.

Alternativ kann der Austrittsschlitz parallel zur Zuflußöffnung an der Seite der Flachstrahldüse angeordnet sein.Alternatively, the outlet slot can be arranged parallel to the inflow opening on the side of the flat jet nozzle.

Eine besonders kostengünstige Ausgestaltung der Flachstrahldüse wird darin gesehen, daß der Austrittsschlitz teilweise durch einen auf eine Seitenbohrung der Flachstrahldüse aufgesetzten Deckel gebildet ist, der durch einen die Seitenbohrung durchdringenden Bolzen befestigt ist.A particularly inexpensive embodiment of the flat jet nozzle is seen in the fact that the outlet slot is partially formed by a cover placed on a side bore of the flat jet nozzle, which is fastened by a bolt penetrating the side bore.

In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen:

  • Fig. 1 eine aus Mischarmatur und Flachstrahldüse bestehende Kühlvorrichtung,
  • Fig. 2 die Kühlvorrichtung in Seitenansicht und im Teilschnitt,
  • Fig. 3 eine andere Flachstrahldüse von der Seite,
  • Fig. 4 einen Schnitt durch die Flachstrahldüse,
  • Fig. 5 eine Vorderansicht der Flachstrahldüse mit einem Sprühfächer und einer Kühlmengenverteilung.
Exemplary embodiments of the invention are shown in the drawing. Show it:
  • 1 is a cooling device consisting of mixing valve and flat jet nozzle,
  • 2 the cooling device in side view and in partial section,
  • 3 shows another flat jet nozzle from the side,
  • 4 shows a section through the flat jet nozzle,
  • Fig. 5 is a front view of the flat jet nozzle with a spray fan and a cooling quantity distribution.

Bei der in den Figuren 1 und 2 dargestellten Zweistoffkühlvorrichtung für Gießstränge ist eine T-förmige Mischarmatur 1 mit je einem Anschlußnippel 2, 3 für eine Luftzuleitung und eine Wasserzuleitung versehen. An einer Austrittsseite der Mischarmatur 1 ist ein Düsenrohr 4 eingeschraubt, an dem eine Flachstrahldüse 5 angeschlossen ist.In the two-substance cooling device for casting strands shown in FIGS. 1 and 2, a T-shaped mixing fitting 1 is provided with a connecting nipple 2, 3 each for an air supply line and a water supply line. A nozzle tube 4, to which a flat jet nozzle 5 is connected, is screwed in on an outlet side of the mixer fitting 1.

Die Flachstrahldüse 5 ist mit einer Zulauföffnung 6 und einer dazu rechtwinkligen Seitenbohrung 7 versehen, deren untere Wandung 8 als Prallfläche wirkt. Die Seitenbohrung 7 ist mit einem Deckel 9 versehen, der mit einem die Seitenbohrung 7 durchdringenden Bolzen 10 an der gegenüberliegenden Wandung der Flachstrahldüse 5 befestigt ist. Die untere Wandung 8 der Flachstrahldüse 5 ist zur Bildung eines Austrittsschlitzes 11 an der Seite des Deckels 9 winkelförmig ausgenommen.The flat jet nozzle 5 is provided with an inlet opening 6 and a side bore 7 at right angles thereto, the lower wall 8 of which acts as an impact surface. The side bore 7 is provided with a cover 9, which is fastened to the opposite wall of the flat jet nozzle 5 by a bolt 10 penetrating the side bore 7. The lower wall 8 of the flat jet nozzle 5 is to form an outlet slot 11 on the side of the Cover 9 angularly excluded.

Bei der in den Figuren 3 bis 5 dargestellten Kühlvorrichtung ist eine an ein Düsenrohr 12 angeschraubte Flachstrahldüse 13 in ihrer Wandung unmittelbar vor einer stirnseitigen Prallfläche 14 mit einem Austrittsschlitz 15 versehen.In the cooling device shown in FIGS. 3 to 5, a flat jet nozzle 13 screwed to a nozzle tube 12 is provided with an outlet slot 15 in its wall immediately in front of an impact surface 14 on the end face.

Das Kühlmittel wird durch die Austrittsschlitze 11, 15 der Flachstrahldüse 5 bzw. 13 in einem Fächer 16 auf eine Gießstrangoberfläche 17 gesprüht, wobei einzelne Kühlmittelstrahlen des Sprühfächers 16 unterschiedliche Auftreffwinkel a, a2 haben. Zur Erzielung einer gleichmäßigen Abkühlung über die Strangbreite b werden für die Breitenbereiche je nach Auftreffwinkel a unterschiedliche Kühlmittelmengen 0. festgelegt. Nach den erforderlichen Kühlmittelmengen Q wird der zugehörige Bereich des Austrittsschlitzes 11, 15 hinsichtlich seiner Breite festgelegt. Aus den Figuren 1 bis 4 ist zu erkennen, daß die Breite der Austrittsschlitze 11, 15 von der Mitte zu den Seiten zunimmt. Auf diese Weise werden die Außenbereiche einer Gießstrangoberfläche 17 nach außen zunehmend definiert mit größerer Kühlmittelmenge Q beaufschlagt (Fig. 5).The coolant is sprayed through the outlet slots 11, 15 of the flat jet nozzle 5 or 13 in a fan 16 onto a casting strand surface 17, with individual coolant jets of the spray fan 16 having different angles of incidence a, a 2 . In order to achieve uniform cooling over the strand width b, different amounts of coolant 0 are defined for the width regions depending on the angle of incidence a. The associated area of the outlet slot 11, 15 is defined in terms of its width according to the required coolant quantities Q. It can be seen from FIGS. 1 to 4 that the width of the outlet slots 11, 15 increases from the center to the sides. In this way, the outer regions of a cast strand surface 17 are subjected to a larger quantity of coolant Q in an increasingly defined manner to the outside (FIG. 5).

Claims (5)

1. Flat jet nozzle (5, 13) in a continuous casting plant for the spraying of a coolant onto a cast strand surface (17), the exit slot (11, 15) of which nozzle shapes a spray fan formed of a plurality of coolant jets, wherein the angles of incidence (ul, a2...) associated with each coolant jet become smaller towards the side regions of the cast strand surface (17), characterised thereby, that the width of the exit slot (11, 15) of the flat jet nozzle (5, 13) increases from its centre towards its sides.
2. Flat jet nozzle according to claim 1, characterised thereby, that the exit slot (15) extends in circumferential direction before a baffle surface (14) of the flat jet nozzle (13).
3. Flat jet nozzle according to claim 1, characterised thereby, that the exit slot (11) is arranged in the wall (8) of the flat jet nozzle (5) parallelly to the inflow opening (6).
4. Flat jet nozzle according to claim 1, characterised thereby, that the exit slot (11) is formed partially by a cover (9) placed onto a side bore (7) of the flat jet nozzle (5).
5. Flat jet nozzle according to claim 4, characterised thereby, that the cover (9) is fastened by a bolt (10) penetrating the side bore.
EP85107858A 1984-07-07 1985-06-25 Flat spray nozzle for cooling of continuously conveyed cast strands in a continuous casting plant Expired EP0167921B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85107858T ATE33775T1 (en) 1984-07-07 1985-06-25 FLAT JET NOZZLE FOR COOLING OF CONTINUOUSLY CONVEYED CASTING STRANDS IN A CONTINUOUS CASTING PLANT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3425092A DE3425092A1 (en) 1984-07-07 1984-07-07 METHOD AND DEVICE FOR COOLING CONTINUOUSLY DELIVERED Pouring Strands in a Continuous Casting Plant
DE3425092 1984-07-07

Publications (3)

Publication Number Publication Date
EP0167921A2 EP0167921A2 (en) 1986-01-15
EP0167921A3 EP0167921A3 (en) 1986-10-08
EP0167921B1 true EP0167921B1 (en) 1988-04-27

Family

ID=6240095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107858A Expired EP0167921B1 (en) 1984-07-07 1985-06-25 Flat spray nozzle for cooling of continuously conveyed cast strands in a continuous casting plant

Country Status (5)

Country Link
US (1) US4641785A (en)
EP (1) EP0167921B1 (en)
JP (1) JPS6130269A (en)
AT (1) ATE33775T1 (en)
DE (2) DE3425092A1 (en)

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JP5104536B2 (en) * 2008-05-16 2012-12-19 マックス株式会社 Fuel filling container and gas combustion type driving tool
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Also Published As

Publication number Publication date
JPS6130269A (en) 1986-02-12
DE3562322D1 (en) 1988-06-01
EP0167921A3 (en) 1986-10-08
ATE33775T1 (en) 1988-05-15
EP0167921A2 (en) 1986-01-15
US4641785A (en) 1987-02-10
DE3425092A1 (en) 1986-02-06

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