EP0101224B1 - Buse pour la pulvérisation d'eau - Google Patents

Buse pour la pulvérisation d'eau Download PDF

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Publication number
EP0101224B1
EP0101224B1 EP83304367A EP83304367A EP0101224B1 EP 0101224 B1 EP0101224 B1 EP 0101224B1 EP 83304367 A EP83304367 A EP 83304367A EP 83304367 A EP83304367 A EP 83304367A EP 0101224 B1 EP0101224 B1 EP 0101224B1
Authority
EP
European Patent Office
Prior art keywords
water
jets
header
jet nozzle
nozzle assembly
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
EP83304367A
Other languages
German (de)
English (en)
Other versions
EP0101224A3 (en
EP0101224A2 (fr
Inventor
Sadao Ebata
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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
Priority claimed from JP13796882A external-priority patent/JPS5929054A/ja
Priority claimed from JP21918982A external-priority patent/JPS6047010B2/ja
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Publication of EP0101224A2 publication Critical patent/EP0101224A2/fr
Publication of EP0101224A3 publication Critical patent/EP0101224A3/en
Application granted granted Critical
Publication of EP0101224B1 publication Critical patent/EP0101224B1/fr
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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems

Definitions

  • This invention relates to a water jet nozzle assembly, and more particularly to a nozzle assembly for jetting cooling water against under- sides of materials such as steel plates and the like for cooling the materials.
  • steel plates are treated to improve their mechanical properties by rapidly cooling them from high temperatures or the red heated condition i.e. by a so-called “hardening” or “quenching” or rapid cooling treatment.
  • cooling water is jetted against the upper and under surfaces of the steel plates to be cooled. In this case, particular precautions must be taken in order to cool the undersides of the plates effectively.
  • the cooling water jetted from nozzles onto the upper surface of the steel plates will stay thereon for the required period of time, so that the overall upper surfaces are cooled in a substantially uniform and effective manner.
  • the cooling effect occurs only at locations where the jetted water initially impinges. After the water has impinged against the underside surface, it immediately drops away from the surface and thereafter it does not cool the surface. It is therefore difficult to cool the undersides of the plates uniformly and effectively.
  • nozzles there have been various kinds of nozzles in the prior art such as spray nozzles, circular opening nozzles, laminar flow nozzles and the like. These nozzles do not provide a satisfactory solution to the problem.
  • FR-A-2 005 744 discloses an assembly for applying coolant to the underside of plate material comprising a header to receive coolant under pressure and provided with a plurality of apertures whereby coolant can flow out of the header in the form of a plurality of jets.
  • the jets of coolant flow in the same direction and are deflected against the underside of the plate material by a curved plate mounted adjacent to the apertures.
  • the coolant has imnpinged on the underside of the plate material and dropped away, its cooling action is finished.
  • a water jet nozzle assembly for location under plate material to apply water to the underside thereof to cool the same comprising an elongated header supplied with cooling water under pressure, means for removing water from the header in the form of a plurality of jets, and a guide means to deflect the jets so that water impinges on said underside characterised in that the means for removing water from the header is such as to form a first plurality of said jets flowing in a first direction and a second plurality of said jets flowing in a second direction which is generally opposite to said first direction and two of said guide means are provided, one for said first plurality of jets and one for said second plurality of jets so that after impinging on said underside water from the jets deflected by the first guide means and water from the jets deflected by the second guide means both flow along the underside towards one another and join together priorto falling away from said underside and recombining with water flowing in said first and second directions.
  • the header is in the form of a hollow cylinder formed along both sides at a mid level with a plurality of apertures in substantially horizontal alignment with each other and spaced by substantially equal intervals to form the means of removing water from the header. Water flowing through these apertures forms said first and second pluralities of jets and the first and second directions of flow are substantially horizontal.
  • the two guide means are in the form of two elongated curved plates having a substantial quadrant-shaped cross-section which are secured to the cylinder below the apertures.
  • the header is in the form of a U-shaped trough.
  • an elongated curved plate is arranged on the U-shaped trough so as to close its top and so that the free longitudinal edges of the curved plate extend upwardly.
  • the means of removing water from the header comprises a plurality of apertures formed in the bottom of the curved plate at substantially equal intervals and diverter plates arranged above the respective apertures so that the jets of water flowing up out of the header via the apertures are diverted and flow in first and second opposite directions which are substantially horizontal directions.
  • the water jet nozzle assembly 1 mainly comprises a header 2 and guide means in the form of plates 3.
  • the header 2 is in the form of an elongated cylinder having a substantially horizontal axis and having an inner cross-sectional area such as to jet supply water substantially uniformly over its length.
  • the header 2 is provided at one end (the right end as viewed in Figs. 1 and 2) with a flange 2a adapted to be connected to a conduit (not shown) for supplying the water under pressure and is closed at the other end by a closure disc 2b.
  • the header 2 is provided in its sidewalls with a plurality of apertures 2c in alignment with each other and parallel with the axis of the header 2.
  • the apertures 2c have diameters of, for example, the order of 3-10 mm and are spaced apart by substantially equal intervals.
  • Water emanating from the apertures 2c is in the form of a first plurality of jets flowing in a first direction and a second plurality of jets flowing in a second direction which is opposite to the first direction. These jets are turned upward by means of the guide plates 3 (later described) to form an upward water flow in the form of a film or laminate.
  • the apertures are shown to be circular, they may be square, rectangular or the like.
  • the first and second directions are horizontal in this embodiment, these directions may be slightly oblique relative to the horizontal provided that they are generally opposite to one another.
  • the guide plates 3 are in the form of elongated plates curved so as to be quadrant shaped in section i.e. as if they were obtained by dividing a circular pipe along its generators into four equal parts.
  • the guide plates 3 are secured to the outer surface of the sidewalls of the header 2 so that one longitudinal edge of the guide plate is adjacent to the lower edges of the apertures 2c and the other longitudinal edge of the plate extends upwardly towards the underside of the material to be cooled.
  • the guide plates have curved smooth upper surfaces and are secured to the header 2 such that tangential lines to the curved upper surfaces of the guide plates at the lower edges of the apertures are aligned with the first and second directions in which the water jets from the apertures 2c flow.
  • the guide plates may be secured to the header by welding.
  • the guide plates 3 serve to turn upwards the water jets flowing from the apertures 2c and to widen the water flow to form flowing films by gathering together the respective jets of water.
  • Fig. 4 illustrating the operation of the water jet nozzle assembly according to the invention
  • the water flows W 1 , W 2 and W 3 formed by the action of the guide plates on the jets from the apertures 2c of the header 2 are cooling a plate material 4 trained along table rollers 5.
  • the water supplied into the header 2 is jetted from the apertures 2c in horizontal directions and guided and turned along the curved upper surfaces of the guide plates 3 upwards towards the material 4 to be cooled.
  • the upward flow is supplemented by recovered water from flow W 3 , later mentioned, and forms the water flows W, which impinge against the lower surface of the material 4 to be cooled.
  • the flow W When the water flow W, collides against the lower surface of the material, the flow W, is divided into two halves W 2 and W 3 .
  • W 2 flows along the lower surface away from the water jet nozzle 1 to cool the material 4 and then falls away and
  • W 3 flows along the lower surface in a direction opposite to W 2 to cool the material 4 and then collides against the water flow W' 3 coming from the opposite direction so that the water flows W 3 and W' 3 combine with each other and then fall away onto the water jet nozzle assembly 1 and are recovered.
  • the amount of water supplied or water jetted from the apertures 2c is substantially equal to the amount of the water W 2 which is consumed or wasted after being used for cooling. Accordingly, the amount of recovered water W 3 reused is also substantially equal to the amount of water jetted from the apertures 2c.
  • the cooling rate of the material increases as the amount of cooling water increases. Accordingly, the water jet nozzle assembly constructed as above described according to the invention can cool material very effectively and rapidly in comparison with nozzles of the prior art, because 2 litres of jetted water are applied to the plate material for each litre of water supplied to the header.
  • the cooling rates of steel plates from a temperature of 800°C to 500°C with a flow rate of 500 l/min.m 2 of cooling water were approximately 1.5 times those obtained using conventional spray nozzles under the same condition.
  • the water flow W is directed vertically upward and the flows W 2 and W 3 are substantially equal in amount.
  • the guide plates 3 may have sections which are somewhat more than a quadrant, so that the free upper ends of the guide plates are inclined towards each other as shown in phantom lines in Fig. 3. With this arrangement, the water flows W 1 are also inclined towards each other, resulting in (water flow W 3 ) ) (water flow W 2 ). In this case, it will be understood that the reused water ratio is more than one, so that more effective and rapid cooling can be carried out.
  • the header 2 and the two guide plates 3 are arranged side by side in a horizontal line, so that the two water flows W 1 directed upwards along the upper surfaces of the guide plates 3 are properly spaced apart from each other.
  • the water jet nozzle assembly according to the embodiment is therefore most suitable for cooling plate materials in slabbing mill lines whose table rollers are sufficiently spaced that such water jet nozzle assemblies can be located therebetween without any trouble.
  • the header 2 is arranged between the two guide plates 3 and it has a relatively large diameter so that the overall width L of the nozzle assembly is fairly large which makes it impossible to use it for cooling plate materials in strip mill lines whose table rollers are not sufficiently spaced.
  • the water jet nozzle assembly 11 mainly comprises a header 15 in the form of a U-shaped trough, a guide plate 12, and diverters 13.
  • the guide plate 12 has a substantially semicircular cross-section and is substantially horizontally arranged on the header 15 integrally therewith to close its upper open side.
  • Each half of the guide plate 12 constitutes a guide means to upwardly deflect, in a smooth manner, water jetted into the bottom of the plate from the header.
  • Its cross-sectional shape may be semicircular, deep U-shaped, or shallow or widened U-shaped.
  • the guide plate is formed in its bottom with a plurality of apertures 12a communicating with the interior of the header 15 for jetting cooling water supplied to the header 15.
  • the apertures 12a are preferably circular having diameters of, for example, 3-10 mm and are spaced apart by equal intervals.
  • the apertures may be square or rectangular or longitudinally elongated slits orthe like.
  • the diverters 13 comprise spacers 14 integrally formed therewith which serve to support the diverters 13 above the respective apertures 12a of the guide plate and are welded to the guide plate to form clearances G between the guide plate and the diverters.
  • the diverters 13 serve to form the water upwardly flowing from the header via the apertures 12a into first and second pluralities of jets flowing in first and second opposite directions which are substantially horizontal directions.
  • the header 15 uniformly distributes the supply water and jets it from the apertures 12a.
  • the header is shown to be box- shaped in cross-section and directly welded to the underside of the guide plate.
  • the shape of the header 15 is not limited to that shown in the drawing.
  • the water flows W1, W 2 and W 3 formed by the action of the guide plate 12 on the jets from the diverters 13 are cooling a plate material 16 trained on table rollers 17.
  • the water supplied into the header 15 is upwardly guided through the apertures 12a and then divided at the diverters 13 to form first and second pluralities of jets in opposite horizontal directions.
  • the horizontal jets are deflected by the upper surfaces of the guide plate so as to impinge against the underside of the plate material 16.
  • the water flows W 1 , W 2 and W 3 and W' flow in substantially the same manner as in the first embodiment with the exception that the united water flows W 3 and W' fall onto the diverters and then flow in separate directions on the diverters and the guide plate 12 where they combine with new water jets from the apertures 12a.
  • the water flow cooling material 16 is twice the suplied water flow in the same manner as in the first embodiment. According ly, the water jet nozzle of this embodiment can cool material no less effectively than the first embodiment. In an experiment, it has been found that the cooling rate of a water jet nozzle of the second embodiment is also about 1.5 times that obtained using conventional spray nozzles.
  • the guide plate 12 may have a cross section which is more than semicircular so that the free upper ends of the guide plate are inclined towards each other as shown in phantom lines in Fig. 7. In this way the water flows W 1 are inclined towards each other, thereaby increasing the reused water flow to carry out a more effective cooling as in the first embodiment.
  • Fig. 9 illustrates a third embodiment of the invention which is a slight modification of the second embodiment.
  • the water jet nozzle assembly 31 includes modified diverters 33.
  • Each diverter 33 comprises a circular disc and a spacer 34 forming a hollow cylinder closed at its upper end by the circular disc and formed with through-holes 34b perpendicular to an axial hole 34a.
  • the hollow cylinders are inserted and fixed in a plurality of apertures formed in the bottom of the guide plate 32 along its length at equal intervals such that the through-holes 34b extend in transverse directions with respect to the length of the guide plate 32 and the lower edges of the through-holes 34b are in line with the upper surface of the guide plate 32.
  • the water jet nozzle assembly according to the invention is capable of effectively cooling the under- sides of plate materials and is applicable to cooling zones having not only wider table pitches as in slab mill lines but also narrower table pitches as in strip mill lines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (6)

1. Ensemble de buse de projection d'eau destiné à être placé sous un matériau sous forme de tôles fortes afin d'appliquer de l'eau à sa face inférieure et de le refroidir, comprenant un distributeur allongé recevant de l'eau de refroidissement sous pression, des moyens destinés à extraire l'eau du distributeur, sous forme de plusieurs jets, et des moyens de guidage destinés a dévier les jets de manière que l'eau vienne frapper la face inférieure, caractérisé en ce que les moyens (2c) (12a, 13) (34a) destinés à extraire l'eau du distributeur (2) (15) (35) sont tels qu'ils forment un premier ensemble de jets s'écoulant dans une première direction et und second ensemble de jets s'écoulant dans une seconde direction qui est opposée de façon générale à la première direction, et deux moyens de guidage (3) (12) (32) sont disposés, un pour le premier ensemble de jets et un pour le second ensemble de jets de manière que, après avoir frappé le face inférieure, l'eau des jets déviés par le premier moyen de guidage et l'eau des jets déviés par le second moyen de guidage s'écoulent toutes deux le long de la face inférieure l'une vers l'autre et se rassemblent avant de retomber de la face inférieure et se de recombiner avec l'eau qui écoule dans la première et dans la seconde direction.
2. Ensemble de buse de projection d'eau selon la revendication 1, dans lequel le distributeur est sous forme d'un cylindre creux (2) disposé horizontalement et les moyens destinés à extraire l'eau du distributeur comporte plusieurs ouvertures (2c) disposées le long d'un premier côté du distributeur, pratiquement dans un alignement horizontal les unes par rapport aux autres, et espacées par des intervalles sensiblement égaux, et un second ensemble d'ou vertures (2c) disposées le long du côté opposé du distributeur, sensiblement alignées en direction horizontale les unes sur les autres et séparées par des intervalles sensiblement égaux, si bien que la première et la seconde direction d'écoulement sont sensiblement horizontales, et chaque moyen de guidage est sous forme d'une plaque courbe allongée (3) ayant une section pratiquement en forme de quart de cercle qui est fixé au cylindre au-dessous des ouvertures (2c).
3. Ensemble de buse de projection d'eau selon la revendication 2, dans lequel les extrémités libres des plaques (3) sont inclinées l'une vers l'autre.
4. Ensemble de buse de projection d'eau selon la revendication 1, dans lequel le distributeur est sous forme d'une rigole en U (15) (35) disposée horizontalement, fermée à sa partie supérieure par une plaque courbe allongée (12), les moyens destinés à extraire l'eau du distributeur comprenant plusieurs ouvertures (12a) espacées de quantités sensiblement égales et formées à la partie inférieure de la plaque courbe (12), et des organes (13) de déviation placés au-dessus des ouvertures respectives (12a) afin qu'ils provoquent l'écoulement des jets d'eau dans la première et la seconde direction qui sont sensiblement horizontales, chaque moitié de la plaque courbe (12) constituant l'un des moyens de guidage.
5. Ensemble de buse de projection d'eau selon la revendication 4, dans lequel les extrémités libres de la plaque courbe (12) sont inclinées l'une vers l'autre.
6. Ensemble de buse de projection d'eau selon l'une des revendications 4 et 5, dans lequel chaque organe de déviation comprend un cylindre creux (34) dont l'extrémité supérieure est fermé par un disque circulaire (33), le cylindre creux (34) ayant des trous débouchants horizontaux (34b).
EP83304367A 1982-08-10 1983-07-28 Buse pour la pulvérisation d'eau Expired EP0101224B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP13796882A JPS5929054A (ja) 1982-08-10 1982-08-10 水噴射ノズル
JP137968/82 1982-08-10
JP21918982A JPS6047010B2 (ja) 1982-12-16 1982-12-16 水噴射ノズル
JP219189/82 1982-12-16

Publications (3)

Publication Number Publication Date
EP0101224A2 EP0101224A2 (fr) 1984-02-22
EP0101224A3 EP0101224A3 (en) 1985-05-22
EP0101224B1 true EP0101224B1 (fr) 1988-02-10

Family

ID=26471127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304367A Expired EP0101224B1 (fr) 1982-08-10 1983-07-28 Buse pour la pulvérisation d'eau

Country Status (4)

Country Link
EP (1) EP0101224B1 (fr)
AU (1) AU546810B2 (fr)
DE (1) DE3375647D1 (fr)
FI (1) FI73001C (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2910653A1 (fr) * 2014-02-22 2015-08-26 Josef Stutz Procédé et dispositif de refroidissement de bandes métalliques

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1541048A (en) * 1924-01-25 1925-06-09 Haueisen Edward Lawn sprinkler
US1867878A (en) * 1930-10-13 1932-07-19 Coviello Anthony Lawn sprinkler
DE1144047B (de) * 1959-08-03 1963-02-21 Mannesmann Ag Beregnungsanlage
US3554513A (en) * 1968-04-08 1971-01-12 Kaiser Aluminium Chem Corp System and apparatus for quick quenching continuously heated strip
FR2323452A3 (fr) * 1974-01-10 1977-04-08 Fives Cail Babcock Dispositif pour la pulverisation de liquides

Also Published As

Publication number Publication date
EP0101224A3 (en) 1985-05-22
FI832833A0 (fi) 1983-08-08
FI73001B (fi) 1987-04-30
AU546810B2 (en) 1985-09-19
EP0101224A2 (fr) 1984-02-22
FI73001C (fi) 1987-08-10
AU1747983A (en) 1984-02-16
FI832833L (fi) 1984-02-11
DE3375647D1 (en) 1988-03-17

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