EP0133180B1 - Strahldüse - Google Patents

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Publication number
EP0133180B1
EP0133180B1 EP84890130A EP84890130A EP0133180B1 EP 0133180 B1 EP0133180 B1 EP 0133180B1 EP 84890130 A EP84890130 A EP 84890130A EP 84890130 A EP84890130 A EP 84890130A EP 0133180 B1 EP0133180 B1 EP 0133180B1
Authority
EP
European Patent Office
Prior art keywords
jet nozzle
rollers
axes
nozzle
jet
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
EP84890130A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0133180A1 (de
Inventor
Othmar Kriegner
Franz Lang
Günter Dipl.-Ing. Holleis
Karl Dr. Schwaha
Fritz Dipl.-Ing. Gränitz
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.)
Primetals Technologies Austria GmbH
Original Assignee
Voestalpine 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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0133180A1 publication Critical patent/EP0133180A1/de
Application granted granted Critical
Publication of EP0133180B1 publication Critical patent/EP0133180B1/de
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

Definitions

  • the invention relates to a jet nozzle for cooling in continuous casting plants, in particular for cooling the support and guide rollers with liquid or liquid gas jets, with two or more nozzle channels arranged side by side in a jet nozzle body, the axes of which are parallel to one another, the hydraulic diameter of the nozzle channels in one Range is 1.5 to 4 mm, and further the jet emerging from the nozzle channels is guided on a guide surface.
  • a nozzle of this type is known from AT-PS 327 418. This jet nozzle is preferably used to cool a strand and / or support and guide rollers in a continuous caster.
  • the aim is to cast strands in the largest possible width range using continuous casting plants. It is already possible to cast slabs 2.5 m wide. In billet or blooms, the aim is to cast several strands with billet or bloom cross-section as closely as possible. For example, it is common for a continuous slab caster to cast several strands with a slab cross section at the same time instead of the strand with a slab cross section.
  • coolant is sprayed primarily against the support and guide rollers, the problem arises that in continuous casting plants, which are built for casting very wide slabs, on the rollers, which are supported several times over their length, at the support points of the rollers at which their jacket is interrupted is, coolant is sprayed onto surfaces of the rollers oriented perpendicular to the axis of the rollers and is directed from there against the strand.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to further develop a jet nozzle of the type described in such a way that the jet emerging from the jet nozzle has a flat cross section, is sharply delimited laterally to its axis without any scattering, and over one Much of its length is kept the same width, so that closely adjacent strand guide rollers in the area which is shielded from the coolant jet against the strand surface are not influenced by the strand heat and, if possible, are not hit directly by the coolant jet itself.
  • this shielded area should be kept as large as possible, but a wide spread and thus a discharge of coolant due to impact on the surfaces of the rolls lying perpendicular to the roll axis on the strand surface is avoided.
  • the guide surface is concave transverse to the nozzle channels, that the nozzle channels merge into the guide surface continuously, the axes of the nozzle channels form an angle of between 0.5 and 5 ° with the guide surface, and that the guide surface is one Has tear-off device with a cutting edge.
  • a preferred embodiment is characterized in that the guide surface is designed as a cylinder jacket surface, the axis of this cylinder jacket surface lying outside the jet nozzle body and in a plane with the axis of the jet nozzle body and preferably to this axis at an angle between 0.5 and 2.5 ° is inclined.
  • the radius of the cylinder jacket surface is preferably between 30 and 80 mm, in particular between 40 and 60 mm,
  • the cutting edge is expediently in a plane directed approximately perpendicular to the axes of the nozzle channels.
  • the projection of the cutting edge in the direction of the axes of the nozzle channels cuts the nozzle channels and the ratio of the length of the cylinder jacket surface to the radius of the cylinder jacket surface is in a range between 0.3 and 1.3, the length of the cylinder jacket surface being between 40 and 60 mm .
  • a further preferred embodiment is characterized in that the ratio of the axis spacing of the axes of the two nozzle channels lying furthest apart from one another to the radius of the cylinder jacket surface is in a range between 0.15 and 0.23.
  • the blasting nozzle being directed with its longitudinal axis parallel to the axes of the rollers and between the rollers and at a distance above the strand surface, i.e. H.
  • the guide surface is expediently directed away from the connecting plane of the lateral surfaces of two adjacent rollers, the tangent lines lying in a plane perpendicular to the axes of the rollers and directed to the guide surface being directed towards the axes of the rollers .
  • FIG. 1 shows a longitudinal section through a jet nozzle and FIG. 2 a cross section along the line 11-11 of FIG. 1.
  • FIG. 3 shows a view of a blasting nozzle in the direction of arrow 111 in FIG. 1.
  • FIG. 4 shows a blasting nozzle according to the invention installed between two strand guide rollers of a continuous caster in a representation analogous to FIG. 3 and a cross section through the coolant jet.
  • the jet nozzle 1 has an essentially cylindrical jet nozzle body 2 which is closed at the front by an end wall 3. At the rear end of the cylindrical jet nozzle body 2, a thread 4 is provided for connection to a coolant pressure line.
  • two mutually parallel nozzle channels 5 are provided, the axes 6 of which lie in a plane 8 supported by the longitudinal axis 7 of the cylindrical jet nozzle body 2.
  • the hydraulic diameter of the nozzle channels is between 1.5 and 4 mm (the hydraulic diameter is the quotient of four times the cross-sectional area and the circumference of a nozzle channel). In the illustrated embodiment, the hydraulic diameter is 2.5 mm.
  • the nozzle channels are arranged parallel to axis 7.
  • the blasting nozzle body 2 is provided with an extension 9, into which a cylindrical surface 10 is incorporated.
  • the nozzle channels 5 pass continuously, d. H. that the line of intersection 11 of the cylindrical surface 10 with the end wall of the jet nozzle body having the outlet openings 12 of the nozzle channels 5 and the outlet openings 12 touch each other, as can be seen from FIG. 2.
  • the axis 13 of the cylindrical surface lies in a plane 14 with the axis 7 of the jet nozzle body and is inclined to this, u. between an angle of between 0.5 and 5 °. According to the exemplary embodiment shown, the angle is 2 °.
  • the length 16 of the cytin dermant surface 10 is 48 mm. It is preferably between 40 and 60 mm.
  • the radius 17 of the cylindrical surface 10 is preferably between 30 and 80 mm. In the illustrated embodiment, it is 60 mm.
  • a tear-off device 18 is provided for the emerging jet, which has a cutting edge 19 which is formed by cutting the cylinder surface 10 with a plane 20 oriented approximately perpendicular to the axis 7 of the jet nozzle body 2.
  • the cutting edge 19 is set back by a distance 22 relative to the end face 21 of the extension.
  • the inclination of the axis 13 of the cylinder jacket surface 10, the nozzle channel diameter 5 ', the length 16 of the cylinder jacket surface 10 and the radius 17 are so matched that the nozzle channels 5 when projecting the cutting edge 19 in the direction of the axes 6 of the nozzle channels 5 are cut from the projection of the cutting edge, ie are only partially covered by the cylindrical surface 10 - seen in the axial direction of the jet nozzle.
  • a part of the nozzle cross section protrudes beyond the cylinder jacket surface 10.
  • FIG. 4 shows a jet nozzle 1 in an illustration analogous to FIG. 3, this jet nozzle 1 being installed between two adjacent strand guide rollers 23. It can be seen that the jet nozzle 1 is provided with its longitudinal axis 7 at a distance 25 above the strand surface, ie at a distance above the connecting plane 25 of the lateral surfaces 26 of two adjacent strand guide rollers 23. In Fig. 4 it is further shown that the tangents 28 placed on the cylinder surface 10 at the longitudinal edges 27 thereof are directed to the axes of the rollers.
  • the cross-section 29 shown in FIG. 4 through the coolant jet has a sickle-shaped shape at a distance from the tear-off device, the width 30 of which remains approximately the same over the entire length of the strand guide rollers.
  • the coolant jet touches the lateral surfaces 26 of the rollers 23, u. over its entire length, so that almost the entire amount of water is sprayed between the strand guide rollers 23 without the lateral surfaces 26 of the rollers being sprayed directly.
  • a coolant jet can effectively prevent a part of the same from being directed onto roller surfaces oriented perpendicular to the axes 31 of the rollers - e.g. B. at their bearings - strikes, as would be the case with a coolant jet widening in the longitudinal direction of the coolant jet. Only a small part of the coolant emerging from a spray nozzle 1 is used to cool the rollers, namely that in the lateral edge regions of the Coolant jet of atomizing coolant. In this way it is possible to reduce the coolant flowing down to the slab to approximately 30% of the total coolant quantity.
  • the coolant jet focused by the cylinder jacket surface 10 effectively shields the roller jacket surfaces 26 from the radiant heat of the strand.
  • the invention is not limited to the exemplary embodiment shown, but can be modified in various ways. It is possible, for example, to provide more than two nozzle channels 5, in which case all nozzle channels 5 pass continuously into the cylinder jacket surface 10, i. H. touch the line of intersection of the cylindrical surface 10 with the end face 3 of the nozzle body.
  • the ratio of the length 16 of the guide surface 10 to its radius 17 being between 0.3 and 1.3 and the length 16 of the guide surface between 40 and 60 mm should lie.
  • the ratio of the center distance 32 of the axes 6 of the two nozzle channels 5 which are furthest apart from one another to the radius 17 of the cylinder jacket surface 10 should be in a range between 0.15 and 0.23 in order to achieve the focusing effect of the cylinder jacket surface.
  • the cylinder surface can be replaced by another surface, for example by a surface with a parabola or an oval as a cross section, the guide surface with parallel displacement of the cross section along the axis 13, i.e. along an inclined to the axis of the jet nozzle body 2 and with this in one plane lying axis is formed.
  • the curvature transverse to the axis of the jet nozzle body is essential.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Nozzles (AREA)
EP84890130A 1983-07-26 1984-07-12 Strahldüse Expired EP0133180B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0271883A AT377461B (de) 1983-07-26 1983-07-26 Strahlduese fuer die kuehlung in stranggiessanlagen
AT2718/83 1983-07-26

Publications (2)

Publication Number Publication Date
EP0133180A1 EP0133180A1 (de) 1985-02-13
EP0133180B1 true EP0133180B1 (de) 1986-11-26

Family

ID=3539206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84890130A Expired EP0133180B1 (de) 1983-07-26 1984-07-12 Strahldüse

Country Status (6)

Country Link
US (1) US4687141A (enrdf_load_stackoverflow)
EP (1) EP0133180B1 (enrdf_load_stackoverflow)
JP (1) JPS6044158A (enrdf_load_stackoverflow)
AT (1) AT377461B (enrdf_load_stackoverflow)
CA (1) CA1216130A (enrdf_load_stackoverflow)
DE (1) DE3461427D1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04130633U (ja) * 1991-05-23 1992-11-30 株式会社クボタ 採光ガラス
DE29500890U1 (de) * 1995-01-20 1995-03-02 Bomag GmbH, 56154 Boppard Sprühdüse
WO2000018514A1 (de) * 1998-09-30 2000-04-06 Voith Sulzer Papiertechnik Patent Gmbh Vorrichtung und verfahren zum auftragen eines flüssigen oder pastösen auftragsmediums auf einen laufenden untergrund

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1536230A (en) * 1923-10-06 1925-05-05 Thomas W Mccue Nozzle for smoke abators
US2530671A (en) * 1945-03-08 1950-11-21 Spraying Systems Co Flat spray nozzle
US2921488A (en) * 1955-11-23 1960-01-19 United States Steel Corp Method and apparatus for cooling mill rolls
US2918220A (en) * 1957-01-22 1959-12-22 Howard M Crow Fluid sprinkler
AT327418B (de) * 1974-01-17 1976-01-26 Voest Ag Strahlduse
SE409961B (sv) * 1974-03-18 1979-09-17 Voest Ag Strenggjutningsanleggning for grovplatemnen
US4130247A (en) * 1976-12-17 1978-12-19 Senninger Irrigation, Inc. Spray nozzle
ZA771362B (en) * 1977-03-08 1978-05-30 Screenex Wire Weaving Mfg Ltd Spray nozzle
AT364980B (de) * 1980-01-11 1981-11-25 Voest Alpine Ag Verfahren zum kontinuierlichen messen der strangoberflaechentemperatur eines gussstranges sowie einrichtung zur durchfuehrung des verfahrens
AT365498B (de) * 1980-04-15 1982-01-25 Voest Alpine Ag Verfahren zur gewinnung fuehlbarer waerme von einem im stranggiessverfahren gegossenen gussstrang und einrichtung zur durchfuehrung des verfahrens
US4320072A (en) * 1981-02-27 1982-03-16 Ecodyne Corporation Cooling tower spray nozzle
US4541564A (en) * 1983-01-05 1985-09-17 Sono-Tek Corporation Ultrasonic liquid atomizer, particularly for high volume flow rates

Also Published As

Publication number Publication date
US4687141A (en) 1987-08-18
EP0133180A1 (de) 1985-02-13
ATA271883A (de) 1984-08-15
DE3461427D1 (en) 1987-01-15
AT377461B (de) 1985-03-25
CA1216130A (en) 1987-01-06
JPS6044158A (ja) 1985-03-09
JPH0353062B2 (enrdf_load_stackoverflow) 1991-08-13

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