EP0660755B1 - Device for linear spraying of a liquid, particularly a cooling liquid - Google Patents

Device for linear spraying of a liquid, particularly a cooling liquid Download PDF

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Publication number
EP0660755B1
EP0660755B1 EP93920887A EP93920887A EP0660755B1 EP 0660755 B1 EP0660755 B1 EP 0660755B1 EP 93920887 A EP93920887 A EP 93920887A EP 93920887 A EP93920887 A EP 93920887A EP 0660755 B1 EP0660755 B1 EP 0660755B1
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EP
European Patent Office
Prior art keywords
liquid
notches
nozzle
elongate
component
Prior art date
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Expired - Lifetime
Application number
EP93920887A
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German (de)
French (fr)
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EP0660755A1 (en
Inventor
Georges 16 allée du Forgeron CHASTANG
Michel Marie Joseph Chiron
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Bertin Technologies SAS
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Bertin et Cie SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2483—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device the supplying means involving no pressure or aspiration, e.g. means involving gravity or capillarity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/025—Nozzles having elongated outlets, e.g. slots, for the material to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0846—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with jets being only jets constituted by a liquid or a mixture containing a liquid
    • 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

  • the present invention relates to a device for spraying a liquid and, more particularly, to such a linear device designed for the linear spraying of a coolant on hot objects such as "blooms" obtained at the outlet of the rolling mill. or continuous casting in the steel industry.
  • linear sprayers of cooling water arranged perpendicular to the direction of advancement of the bloom and parallel to the faces thereof so as to sprinkle them with this water. It has also been indicated that said linear sprayers should each be able to cover the largest possible area so as to limit their number and the associated maintenance problems such as the maintenance of plumbing, the more complex the number of sprayers to be. supply is large and simplifies the adjustment of flow rates by limiting the number of valves.
  • the flow rate of water sprayed can vary over a wide range of flow rates.
  • the variation ratio reaches 3 or 4 at most while a ratio greater than 10 would be desirable in the steel industry so that identical and therefore interchangeable sprayers can be used in various places requiring cooling of different intensities adjusted by adjusting the water flow rates of the sprayers.
  • the object of the present invention is therefore to produce an apparatus for linear spraying of a liquid, in particular a cooling liquid, which makes it possible to reach wide spraying angles without resorting to spraying slots of width less than a millimeter.
  • the aim of the present invention is also to produce such a spraying device having a large variation ratio of the flow rate of sprayed liquid, typically greater 10.
  • a device for linear spraying of a liquid in particular a cooling liquid, of the type which comprises means arranged in a box. for bringing the liquid into an elongated spray nozzle and formed in the wall of the box and means for injecting a gas into this box to spray the liquid brought into the nozzle and entrain it out of the box.
  • the apparatus comprises an elongated part arranged in the box to be watered by the liquid leaving the liquid supply means which then spreads over a surface convex of this part to be entrained by the gas and to flow towards two elongated slots adjacent to the nozzle and which converge therein, the widths of the slots varying periodically and additionally along their length so as to delimit two layers of the liquid mixture / gases which interpenetrate at the level of the spout, forming at the outlet thereof a liquid mist confined in a dihedral opening from the spout.
  • each slot is delimited by a part of the internal wall of the box and a surface of the elongated part arranged opposite and which extends one end of the convex surface of this part, the two surfaces of the elongated part which each delimit a slit intersecting at the level of the spray nozzle.
  • These surfaces are hollowed out with notches distributed regularly throughout the spray nozzle, the notches on one surface being offset longitudinally from the notches on the other surface.
  • the notches have, along the longitudinal axis of the elongated part, a fixed width equal to that of the surface elements which separate them, the notches of one of the surfaces being offset from the notches of the other surface by the width of these elements of surface.
  • the apparatus comprises a box 1 generally parallelepiped which communicates with a source (not shown) of a gas such as air, by a conduit 2.
  • a source not shown
  • the casing 1 there are means for supplying a liquid constituted by a series of tubes 3 1 to 3 17 mounted parallel to each other and perpendicular to a liquid supply conduit 4 connected to a source of such a liquid (not shown).
  • the duct 4 serves to close one face of the box 1 on which it is fixed by welding seams, for example.
  • FIG. 2 where, for the sake of clarity, only the axes of these tubes have been shown, these are regularly spaced and open out in the vicinity of a curved surface 5 1 of an elongated part 5 of which the presence in the apparatus constitutes an essential characteristic of the present invention.
  • a linear sprayer comprising means for supplying water into a spray nozzle and boxes adjacent to this nozzle and connected to a source of pressurized air for spraying water. brought in the beak.
  • this known sprayer does not include organs such as this elongated part and therefore does not provide the advantages which are drawn from it and which will be described below.
  • the elongated part 5 takes the form of a bar having, in addition to its convex surface 5 1 , two other contiguous surfaces 5 2 , 5 3 completing its external surface and which are visible in FIG. 3. In this figure it appears that these surfaces are hollowed out with notches referenced 6 2 , 6 3 respectively, these notches being distributed regularly throughout the part, the notches 6 2 on one surface 5 2 being offset longitudinally from the notches 6 3 on the other surface 5 3 .
  • the surfaces 5 2 , 5 3 face respectively parts of the internal wall of the box 1, adjacent to a spray nozzle 7 cut out from the wall of the box 1 opposite to that which is closed by the conduit 4.
  • the surfaces 5 2 , 5 3 are separated from these wall parts so as to delimit slots 8 1 , 8 2 respectively, by which the gas and the liquid injected into the box can exit from it by the spray nozzle 7 on which the two slots converge.
  • the notches 6 2 , 6 3 have, along the longitudinal axis of the elongated part 5, a fixed width equal to that of planar surface elements which separate them, the notches of a surfaces of the elongated part being offset longitudinally from the notches of the other surface of this part, by the width of a plane surface element. It will be noted incidentally that these notches take the form of cells with a curved bottom.
  • the operation of the apparatus according to the invention is then established as follows.
  • a liquid and a gas under pressure supplying respectively the conduits 4 and 2
  • the liquid flowing from the ends of the tubes 3 1 to 3 17 sprinkles the elongated part 5 over the entire length of its convex surface 5 1 , which can be a surface cylindrical of revolution for example.
  • the liquid then spreads over this surface and follows the profile of its curvature by the Coanda effect before entering the slots 8 1 , 8 2 with the injected gas which causes it by viscous friction in the constriction delimited by the convex surface and the internal wall of the box.
  • the notches 6 2 , 6 3 could take forms other than those of cells with a curved bottom. This is how these notches could present, for example, flat backgrounds.
  • the surface elements separating the notches could take forms other than planar insofar as the elements of the sheet of the liquid / gas mixture that these intervals define continue to have a smaller cross-section than that of the elements of the sheet delimited by the notches.
  • a spray angle ⁇ of 60 ° of a coolant consisting of water and sprayed with a gas consisting of air, these fluids being supplied to the device under relative pressures of 1 and 0.1 bar respectively.
  • the mean planes of the two slots define a dihedral of approximately 120 ° opening.
  • the width of the spray nozzle and the slots is everywhere more than 1 mm, in order to avoid the clogging problems mentioned above.
  • the radius of the cylindrical surface 5 1 of the elongated part 5 is 20 mm while the pitch of the tubes is 10 mm.
  • the present invention it is possible to further enlarge the angle ⁇ of diffusion of the liquid mist by mounting a deflecting skirt 9 on the apparatus, as shown in broken lines in FIG. 1.
  • This skirt has an opening angle calculated so that , by the Coanda effect which results from its presence, the liquid mist approaches the inner wall of the skirt by increasing the angle of diffusion of the mist which can then reach a value ⁇ 'of approximately 90 °, for example.
  • the device according to the invention has other advantages.
  • the flow rate can be regulated in an extremely wide range which can be quantified by an extreme flow rate ratio greater than 10 and which can even reach 15, that is to say a flow rate ratio much greater than those observed with the devices of the prior art where this ratio only reaches 3 or, 4.
  • this flexibility in fixing the flow rate makes it possible to install the device according to the invention in various locations. '' a cooling installation for which the fluid flows required for cooling are very different. This results in great flexibility in the use of this device.
  • the convex surface of the elongated part makes it possible to reduce any inhomogeneity which could result from a misalignment of the water supply tubes.
  • the elongated part 5 By mounting the elongated part 5 so that it can be disassembled by axial extraction or by adopting another mounting method consisting in making a removable sprayer nose comprising the elongated part 5 and the spout 7, it is easier to disassemble and allows quick access to the interior of the device for cleaning, for example, or the replacement of the elongated part by another part of geometry suitable for obtaining other performance.
  • the invention is not limited to the embodiment described and shown and to the application mentioned, which have been given only by way of example.
  • the apparatus according to the invention can also be used for cooling aluminum profiles, large beams, or spraying liquids other than coolants such as varnish, paint, etc.
  • 'Apparatus according to the invention could operate with any orientation in the space of the spray nozzle.

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

Abstract

The device comprises means (3i, 4) in an enclosure (1) for bringing the liquid to an elongate spray nozzle (7) in the wall of the enclosure, and means for injecting gas into said enclosure to spray the liquid fed to the nozzle by driving it out of said enclosure. An elongate element (5) is provided in the enclosure to receive the liquid from the feed means. Said liquid is spread over a convex surface (51) of said element and is then carried off by the gas and flows to two elongate slits (81, 82) adjacent to the nozzle (7) and converging towards the latter. The width of these slits varies periodically and interdependently over their length to form two sheets of the liquid/gas mixture which come together at the nozzle (7) to form at its outlet a mist of liquid confined within an angle (α) from the nozzle. Application in cooling steel blooms or aluminum sections.

Description

La présente invention est relative à un appareil de pulvérisation d'un liquide et, plus particulièrement, à un tel appareil linéaire conçu pour la pulvérisation linéaire d'un liquide de refroidissement sur des objets chauds tels que des "blooms" obtenus en sortie de laminoir ou de coulée continue dans l'industrie sidérurgique.The present invention relates to a device for spraying a liquid and, more particularly, to such a linear device designed for the linear spraying of a coolant on hot objects such as "blooms" obtained at the outlet of the rolling mill. or continuous casting in the steel industry.

On a exprimé dans cette industrie un besoin pour des pulvérisateurs linéaires d'eau de refroidissement disposés perpendiculairement à la direction d'avancement du bloom et parallèlement aux faces de celui-ci de manière à les arroser avec cette eau. On a également indiqué que lesdits pulvérisateurs linéaires devraient pouvoir couvrir chacun la plus grande surface possible de manière à limiter ainsi leur nombre et les problèmes de maintenance associés tels que l'entretien d'une plomberie d'autant plus complexe que le nombre de pulvérisateurs à alimenter est grand et à simplifier le réglage des débits en limitant le nombre de vannes.There has been expressed in this industry a need for linear sprayers of cooling water arranged perpendicular to the direction of advancement of the bloom and parallel to the faces thereof so as to sprinkle them with this water. It has also been indicated that said linear sprayers should each be able to cover the largest possible area so as to limit their number and the associated maintenance problems such as the maintenance of plumbing, the more complex the number of sprayers to be. supply is large and simplifies the adjustment of flow rates by limiting the number of valves.

On peut penser à constituer un tel pulvérisateur avec un jeu de tubes cylindriques alignés et alimentés en eau de refroidissement. On sait que l'angle d'épanouissement de l'eau ainsi pulvérisée à la sortie du tube est fonction de la géométrie des buses placées à l'extrémité des tubes; ceci conduit à une homogéneité du refroidissement considérée comme insuffisante dans l'application évoquée.One can think of constituting such a sprayer with a set of aligned cylindrical tubes supplied with cooling water. It is known that the angle of blooming of the water thus sprayed at the outlet of the tube is a function of the geometry of the nozzles placed at the end of the tubes; this leads to homogeneity of the cooling considered to be insufficient in the application mentioned.

On peut penser aussi à utiliser des pulvérisateurs linéaires à fentes, tels que celui décrit dans la demande internationale de brevet WO 89/10203 déposée au nom de la demanderesse. Avec des fentes très minces de l'ordre de 0,2 mm par exemple et à parois très lisses, on arrive à un angle d'épanouissement de 90° environ qui serait satisfaisant dans l'application envisagée ci-dessus. Malheureusement, en sidérurgie, l'utilisation d'un pulvérisateur à fente de 0,2 mm de largeur n'est pas envisageable du fait de la qualité de l'eau utilisée, chargée en particules dures qui colmateraient rapidement une telle fente. La largeur minimum de fente admissible est 1 mm et, avec une telle largeur de fente, l'angle d'épanouissement de l'eau pulvérisée est d'environ 30° seulement, ce qui est insuffisant pour satisfaire à la condition de couverture d'une grande surface posée ci-dessus. Un pulvérisateur linéaire du type de la présente invention est aussi décrit dans le document FR-A-430 980.One can also think of using linear sprayers with slots, such as that described in the international patent application WO 89/10203 filed in the name of the applicant. With very thin slots of the order of 0.2 mm for example and with very smooth walls, we arrive at a blooming angle of about 90 ° which would be satisfactory in the application envisaged above. Unfortunately, in the steel industry, the use of a 0.2 mm wide slit sprayer cannot be envisaged due to the quality of the water used, charged with hard particles which would quickly plug such a slit. The minimum permissible slit width is 1 mm and, with such a slit width, the blooming angle of the water spray is only about 30 °, which is insufficient to satisfy the condition of covering a large area posed above. A linear sprayer of the type of the present invention is also described in document FR-A-430 980.

On souhaite en outre que le débit d'eau pulvérisée puisse varier dans une large gamme de débits. Avec les pulvérisateurs ou atomiseurs connus, le rapport de variation atteint 3 ou 4 au maximum alors qu'un rapport supérieur à 10 serait souhaitable en sidérurgie pour que des pulvérisateurs identiques et donc interchangeables puissent être utilisés en divers endroits exigeant des refroidissements d'intensités différentes ajustées par réglage des débits d'eau des pulvérisateurs.It is further desired that the flow rate of water sprayed can vary over a wide range of flow rates. With known sprayers or atomizers, the variation ratio reaches 3 or 4 at most while a ratio greater than 10 would be desirable in the steel industry so that identical and therefore interchangeable sprayers can be used in various places requiring cooling of different intensities adjusted by adjusting the water flow rates of the sprayers.

La présente invention a donc pour but de réaliser un appareil de pulvérisation linéaire d'un liquide, notamment de refroidissement, qui permette d'atteindre des angles de pulvérisation larges sans recourir à des fentes de pulvérisation de largeur inférieure au millimètre.The object of the present invention is therefore to produce an apparatus for linear spraying of a liquid, in particular a cooling liquid, which makes it possible to reach wide spraying angles without resorting to spraying slots of width less than a millimeter.

La présente invention a aussi pour but de réaliser un tel appareil de pulvérisation présentant un grand rapport de variation du débit de liquide pulvérisé, typiquement supérieur 10.The aim of the present invention is also to produce such a spraying device having a large variation ratio of the flow rate of sprayed liquid, typically greater 10.

On atteint ces buts de l'invention ainsi que d'autres qui apparaîtront à la lecture de la description qui va suivre, avec un appareil de pulvérisation linéaire d'un liquide, notamment de refroidissement, du type qui comprend des moyens disposés dans un caisson pour amener le liquide dans un bec de pulvérisation allongé et formé dans la paroi du caisson et des moyens d'injection d'un gaz dans ce caisson pour pulvériser le liquide amené dans le bec et l'entraîner hors du caisson. Suivant l'invention, l'appareil comprend une pièce allongée agencée dans le caisson pour être arrosée par le liquide sortant des moyens d'amenée du liquide qui se répand alors sur une surface convexe de cette pièce pour être entraîné par le gaz et s'écouler vers deux fentes allongées adjacentes au bec et qui convergent dans celui-ci, les largeurs des fentes variant périodiquement et complémentairement suivant leur longueur de manière à délimiter deux nappes du mélange liquide/gaz qui s'interpénètrent au niveau du bec en formant à la sortie de celui-ci un brouillard liquide confiné dans un dièdre s'ouvrant à partir du bec.These objects of the invention are achieved as well as others which will appear on reading the description which follows, with a device for linear spraying of a liquid, in particular a cooling liquid, of the type which comprises means arranged in a box. for bringing the liquid into an elongated spray nozzle and formed in the wall of the box and means for injecting a gas into this box to spray the liquid brought into the nozzle and entrain it out of the box. According to the invention, the apparatus comprises an elongated part arranged in the box to be watered by the liquid leaving the liquid supply means which then spreads over a surface convex of this part to be entrained by the gas and to flow towards two elongated slots adjacent to the nozzle and which converge therein, the widths of the slots varying periodically and additionally along their length so as to delimit two layers of the liquid mixture / gases which interpenetrate at the level of the spout, forming at the outlet thereof a liquid mist confined in a dihedral opening from the spout.

Grâce à cette pièce et à ces fentes, on peut atteindre comme on le verra dans la suite, des angles d'ouverture de ce dièdre atteignant 60° et même 90°, avec des fentes et un bec de largeur jamais inférieure à 1 mm, conformément à la condition posée par l'industrie sidérurgique.Thanks to this part and these slots, we can reach, as we will see below, opening angles of this dihedral reaching 60 ° and even 90 °, with slots and a spout never less than 1 mm wide, in accordance with the condition laid down by the steel industry.

Suivant un mode de réalisation particulier de l'appareil selon l'invention, chaque fente est délimitée par une partie de paroi interne du caisson et une surface de la pièce allongée disposée en regard et qui prolonge une extrémité de la surface convexe de cette pièce, les deux surfaces de la pièce allongée qui délimitent chacune une fente se coupant au niveau du bec de pulvérisation. Ces surfaces sont creusées d'encoches distribuées régulièrement tout au long du bec de pulvérisation, les encoches d'une surface étant décalées longitudinalement des encoches de l'autre surface. Les encoches présentent, suivant l'axe longitudinal de la pièce allongée, une largeur fixe égale à celle des éléments de surface qui les sépare, les encoches d'une des surfaces étant décalées des encoches de l'autre surface de la largeur de ces éléments de surface.According to a particular embodiment of the apparatus according to the invention, each slot is delimited by a part of the internal wall of the box and a surface of the elongated part arranged opposite and which extends one end of the convex surface of this part, the two surfaces of the elongated part which each delimit a slit intersecting at the level of the spray nozzle. These surfaces are hollowed out with notches distributed regularly throughout the spray nozzle, the notches on one surface being offset longitudinally from the notches on the other surface. The notches have, along the longitudinal axis of the elongated part, a fixed width equal to that of the surface elements which separate them, the notches of one of the surfaces being offset from the notches of the other surface by the width of these elements of surface.

Comme on le verra plus loin, c'est grâce à cette disposition que deux nappes de mélange liquide/gaz qui passent dans les fentes peuvent s'interpénétrer au niveau du bec de pulvérisation de manière à conserver une ouverture maximale au dièdre dans lequel ce bec diffuse du liquide pulvérisé.As will be seen later, it is thanks to this arrangement that two layers of liquid / gas mixture which pass through the slots can interpenetrate at the level of the spray nozzle so as to maintain a maximum opening at the dihedral in which this nozzle diffuses sprayed liquid.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre et à l'examen du dessin annexé dans lequel :

  • la figure 1 est une vue en coupe transversale de l'appareil de pulvérisation linéaire suivant la présente invention,
  • la figure 2 est une vue en coupe longitudinale suivant le trait de coupe II-II de la figure 1, et
  • la figure 3 est une vue de la pièce allongée formant partie de l'appareil suivant l'invention, prise suivant la flèche F de la figure 2.
Other characteristics and advantages of the present invention will appear on reading the description which will follow and upon examination of the appended drawing in which:
  • FIG. 1 is a cross-sectional view of the linear spraying apparatus according to the present invention,
  • FIG. 2 is a view in longitudinal section along the section line II-II in FIG. 1, and
  • FIG. 3 is a view of the elongated part forming part of the apparatus according to the invention, taken along arrow F in FIG. 2.

On se réfère aux figures 1 à 3 du dessin annexé où il apparaît que l'appareil suivant l'invention comprend un caisson 1 généralement parallélépipédique qui communique avec une source (non représentée) d'un gaz tel que de l'air, par un conduit 2. Dans le caisson 1 on trouve des moyens d'amenée d'un liquide constitués par une série de tubes 31 à 317 montés parallèlement les uns aux autres et perpendiculairement à un conduit d'amenée de liquide 4 raccordé à une source d'un tel liquide (non représentée). On notera incidemment que, d'une manière avantageuse, le conduit 4 sert à fermer une face du caisson 1 sur lequel il est fixé par des cordons de soudure, par exemple.Referring to Figures 1 to 3 of the accompanying drawing where it appears that the apparatus according to the invention comprises a box 1 generally parallelepiped which communicates with a source (not shown) of a gas such as air, by a conduit 2. In the casing 1 there are means for supplying a liquid constituted by a series of tubes 3 1 to 3 17 mounted parallel to each other and perpendicular to a liquid supply conduit 4 connected to a source of such a liquid (not shown). Incidentally, it will be noted that, advantageously, the duct 4 serves to close one face of the box 1 on which it is fixed by welding seams, for example.

Comme cela apparaît sur la figure 2 où, pour la clarté du dessin on n'a représenté que les axes de ces tubes, ceux-ci sont régulièrement espacés et débouchent au voisinage d'une surface incurvée 51 d'une pièce allongée 5 dont la présence dans l'appareil constitue une caractéristique essentielle de la présente invention. On connaît en effet de la demande internationale de brevet précitée un pulvérisateur linéaire comportant des moyens d'amenée d'eau dans un bec de pulvérisation et des caissons adjacents à ce bec et raccordés à une source d'air sous pression pour pulvériser l'eau amenée dans le bec. Toutefois ce pulvérisateur connu ne comprend pas d'organes tels que cette pièce allongée et ne procure donc pas les avantages que l'on en tire et que l'on décrira plus loin.As can be seen in FIG. 2 where, for the sake of clarity, only the axes of these tubes have been shown, these are regularly spaced and open out in the vicinity of a curved surface 5 1 of an elongated part 5 of which the presence in the apparatus constitutes an essential characteristic of the present invention. There is indeed known from the aforementioned international patent application a linear sprayer comprising means for supplying water into a spray nozzle and boxes adjacent to this nozzle and connected to a source of pressurized air for spraying water. brought in the beak. However, this known sprayer does not include organs such as this elongated part and therefore does not provide the advantages which are drawn from it and which will be described below.

La pièce allongée 5 prend la forme d'une barrette présentant, outre sa surface convexe 51, deux autres surfaces 52,53 contigues complétant sa surface extérieure et qui sont visibles sur la figure 3. Sur cette figure il apparaît que ces surfaces sont creusées d'encoches référencées 62,63 respectivement, ces encoches étant distribuées régulièrement tout au long de la pièce, les encoches 62 d'une surface 52 étant décalées longitudinalement des encoches 63 de l'autre surface 53.The elongated part 5 takes the form of a bar having, in addition to its convex surface 5 1 , two other contiguous surfaces 5 2 , 5 3 completing its external surface and which are visible in FIG. 3. In this figure it appears that these surfaces are hollowed out with notches referenced 6 2 , 6 3 respectively, these notches being distributed regularly throughout the part, the notches 6 2 on one surface 5 2 being offset longitudinally from the notches 6 3 on the other surface 5 3 .

Dans la position de cette pièce allongée ou barrette 5 représentée à la figure 1, les surfaces 52,53 font face respectivement à des parties de la paroi interne du caisson 1, voisines d'un bec de pulvérisation 7 découpé dans la paroi du caisson 1 opposée à celle qui est fermée par le conduit 4. Les surfaces 52,53 sont écartées de ces parties de paroi de manière à délimiter des fentes 81,82 respectivement, par lesquelles le gaz et le liquide injectés dans le caisson peuvent sortir de celui-ci par le bec de pulvérisation 7 sur lequel les deux fentes convergent.In the position of this elongated part or bar 5 shown in FIG. 1, the surfaces 5 2 , 5 3 face respectively parts of the internal wall of the box 1, adjacent to a spray nozzle 7 cut out from the wall of the box 1 opposite to that which is closed by the conduit 4. The surfaces 5 2 , 5 3 are separated from these wall parts so as to delimit slots 8 1 , 8 2 respectively, by which the gas and the liquid injected into the box can exit from it by the spray nozzle 7 on which the two slots converge.

On revient à la figure 3 pour observer que les encoches 62,63 présentent, suivant l'axe longitudinal de la pièce allongée 5, une largeur fixe égale à celle d'éléments de surface plans qui les séparent, les encoches d'une des surfaces de la pièce allongée étant décalées longitudinalement des encoches de l'autre surface de cette pièce, de la largeur d'un élément de surface plan. On remarquera incidemment que ces encoches prennent la forme d'alvéoles à fond incurvé.Returning to FIG. 3 to observe that the notches 6 2 , 6 3 have, along the longitudinal axis of the elongated part 5, a fixed width equal to that of planar surface elements which separate them, the notches of a surfaces of the elongated part being offset longitudinally from the notches of the other surface of this part, by the width of a plane surface element. It will be noted incidentally that these notches take the form of cells with a curved bottom.

Le fonctionnement de l'appareil suivant l'invention s'établit alors comme suit. Un liquide et un gaz sous pression alimentant respectivement les conduits 4 et 2, le liquide s'écoulant des extrémités des tubes 31 à 317 arrose la pièce allongée 5 sur toute la longueur de sa surface convexe 51, qui peut être une surface cylindrique de révolution par exemple. Le liquide s'étale alors sur cette surface et suit le profil de sa courbure par effet Coanda avant d'entrer dans les fentes 81,82 avec le gaz injecté qui l'entraîne par frottement visqueux dans l'étranglement délimité par la surface convexe et la paroi interne du caisson. Ainsi se forme dans ces fentes deux nappes convergentes d'un mélange liquide/gaz, ces nappes s'interpénétrant, suivant l'invention, au niveau du bec de pulvérisation 7 grâce à l'entrelacement des jets de plus forte section, et donc plus puissants, qui sont formés au niveau des alvéoles 62 et 63, ces jets se croisant sans coalescence importante du fait du décalage des alvéoles 62 et 63. En effet chaque jet s'oppose, dans le bec de pulvérisation, au jet "plat" de moindre section et moins puissant qui lui fait face et poursuit alors sa progression sensiblement selon son axe, en conservant ainsi au dièdre délimitant le liquide pulvérisé par le bec une extension angulaire α maximale.The operation of the apparatus according to the invention is then established as follows. A liquid and a gas under pressure supplying respectively the conduits 4 and 2, the liquid flowing from the ends of the tubes 3 1 to 3 17 sprinkles the elongated part 5 over the entire length of its convex surface 5 1 , which can be a surface cylindrical of revolution for example. The liquid then spreads over this surface and follows the profile of its curvature by the Coanda effect before entering the slots 8 1 , 8 2 with the injected gas which causes it by viscous friction in the constriction delimited by the convex surface and the internal wall of the box. Thus formed in these slots two converging plies of a liquid / gas mixture, these plies interpenetrating, according to the invention, at the spray nozzle 7 through the intertwining of jets of larger section, and therefore more powerful, which are formed at the alveoli 6 2 and 6 3 , these jets intersecting without significant coalescence due to the offset of the alveoli 6 2 and 6 3 . Indeed, each jet is opposed, in the spray nozzle, to the "flat" jet of smaller section and less powerful which faces it and then continues its progression substantially along its axis, thus keeping the dihedral delimiting the liquid sprayed by the beak maximum angular extension α.

Grâce à cette extension angulaire α importante, on peut arroser une surface importante avec un appareil de pulvérisation suivant l'invention et limiter ainsi le nombre d'appareils à utiliser pour arroser une surface donnée, conformément à l'un des objectifs essentiels de la présente invention.Thanks to this significant angular extension α, it is possible to water a large surface with a spraying device according to the invention and thus limit the number of devices to be used to spray a given surface, in accordance with one of the essential objectives of the present invention.

Dans l'application mentionnée plus haut au refroidissement de "blooms" à l'aide du brouillard liquide émis par le bec de pulvérisation de l'appareil suivant l'invention, ceci permet de limiter le nombre d'appareils à utiliser et donc la complexité de la plomberie d'alimentation de ces appareils et le coût de la maintenance de cette plomberie.In the application mentioned above for cooling "blooms" using the liquid mist emitted by the spray nozzle of the device according to the invention, this makes it possible to limit the number of devices to be used and therefore the complexity of the plumbing supplying these devices and the cost of maintaining that plumbing.

Incidemment, on remarquera que les encoches 62,63 pourraient prendre des formes autres que celles d'alvéoles à fond incurvé. C'est ainsi que ces encoches pourraient présenter par exemple des fonds plans. De même les éléments de surface séparant les encoches pourraient prendre des formes autres que planes dans la mesure où les éléments de nappe du mélange liquide/gaz que ces intervalles délimitent continuent à présenter une section moindre que celle des éléments de nappe délimités par les encoches.Incidentally, it will be noted that the notches 6 2 , 6 3 could take forms other than those of cells with a curved bottom. This is how these notches could present, for example, flat backgrounds. Similarly, the surface elements separating the notches could take forms other than planar insofar as the elements of the sheet of the liquid / gas mixture that these intervals define continue to have a smaller cross-section than that of the elements of the sheet delimited by the notches.

A titre d'exemple non limitatif, on a pu obtenir un angle de pulvérisation α de 60°, d'un liquide de refroidissement constitué par de l'eau et pulvérisé par un gaz constitué par de l'air, ces fluides étant fournis à l'appareil sous des pressions relatives de 1 et 0,1 bar respectivement. Les plans moyens des deux fentes définissent un dièdre de 120° d'ouverture environ. La largeur du bec de pulvérisation et des fentes est partout supérieure à 1 mm, afin d'éviter les problèmes de colmatage mentionnés plus haut. Le rayon de la surface cylindrique 51 de la pièce allongée 5 est de 20 mm alors que le pas des tubes est de 10 mm.By way of nonlimiting example, we were able to obtain a spray angle α of 60 °, of a coolant consisting of water and sprayed with a gas consisting of air, these fluids being supplied to the device under relative pressures of 1 and 0.1 bar respectively. The mean planes of the two slots define a dihedral of approximately 120 ° opening. The width of the spray nozzle and the slots is everywhere more than 1 mm, in order to avoid the clogging problems mentioned above. The radius of the cylindrical surface 5 1 of the elongated part 5 is 20 mm while the pitch of the tubes is 10 mm.

Suivant la présente invention, on peut encore agrandir l'angle α de diffusion du brouillard liquide en montant une jupe déflectrice 9 sur l'appareil, comme représenté en trait interrompu à la figure 1. Cette jupe présente un angle d'ouverture calculé pour que, par l'effet Coanda qui résulte de sa présence, le brouillard liquide se rapproche de la paroi intérieure de la jupe en accroissant l'angle de diffusion du brouillard qui peut alors atteindre une valeur α' de 90° environ, par exemple.According to the present invention, it is possible to further enlarge the angle α of diffusion of the liquid mist by mounting a deflecting skirt 9 on the apparatus, as shown in broken lines in FIG. 1. This skirt has an opening angle calculated so that , by the Coanda effect which results from its presence, the liquid mist approaches the inner wall of the skirt by increasing the angle of diffusion of the mist which can then reach a value α 'of approximately 90 °, for example.

Outre ce grand angle de diffusion et l'absence de colmatage déjà mentionnés, l'appareil suivant l'invention présente d'autres avantages. Conformément à l'un des objectifs de la présente invention, le débit peut être réglé dans une gamme extrêmement large qui peut être quantifiée par un rapport de débit extrême supérieur à 10 et qui peut même atteindre 15, soit un rapport de débit très supérieur à ceux observés avec les appareils de la technique antérieure où ce rapport atteint seulement 3 ou, 4. Comme on l'a vu plus haut, cette souplesse dans la fixation du débit permet d'installer l'appareil suivant l'invention en divers emplacements d'une installation de refroidissement pour lesquels les flux de fluide nécessaires au refroidissement sont très différents. Il en résulte une grande souplesse d'emploi de cet appareil.In addition to this large angle of diffusion and the absence of clogging already mentioned, the device according to the invention has other advantages. According to one of the objectives of the present invention, the flow rate can be regulated in an extremely wide range which can be quantified by an extreme flow rate ratio greater than 10 and which can even reach 15, that is to say a flow rate ratio much greater than those observed with the devices of the prior art where this ratio only reaches 3 or, 4. As we saw above, this flexibility in fixing the flow rate makes it possible to install the device according to the invention in various locations. '' a cooling installation for which the fluid flows required for cooling are very different. This results in great flexibility in the use of this device.

En utilisant des tubes d'alimentation en eau de faible diamètre (par exemple 2 mm de diamètre) et de grande longueur, on peut établir dans ces tubes une perte de charge par frottement importante qui assure une répartition homogène de l'eau sur toute la longueur de la pièce allongée 5 et donc une bonne homogénéité du brouillard liquide qui sort du bec de pulvérisation de l'appareil.Using small diameter water supply tubes (e.g. 2 mm in diameter) and large length, it is possible to establish in these tubes a significant pressure drop by friction which ensures a homogeneous distribution of the water over the entire length of the elongated part 5 and therefore good homogeneity of the liquid mist which leaves the spray nozzle of the apparatus.

Cette homogénéité résulte encore du mélange de jets très inclinés formés au niveau des encoches avec les jets plats formés entre ces encoches et qui sont moins inclinés.This homogeneity also results from the mixture of very inclined jets formed at the notches with the flat jets formed between these notches and which are less inclined.

On remarquera que la surface convexe de la pièce allongée permet de réduire toute inhomogénéité qui pourrait résulter d'un défaut d'alignement des tubes d'alimentation en eau.It will be noted that the convex surface of the elongated part makes it possible to reduce any inhomogeneity which could result from a misalignment of the water supply tubes.

Grâce à la contre-pression appliquée par l'air à l'eau contenue dans les tubes, on peut maintenir ceux-ci remplis pendant une période d'arrêt de la pulvérisation. Ce remplissage réduit le temps de réamorçage de l'appareil lorsque celui-ci est remis en marche.Thanks to the back pressure applied by the air to the water contained in the tubes, it is possible to keep them filled during a period of stopping the spraying. This filling reduces the device's reboot time when it is restarted.

En montant la pièce allongée 5 de manière qu'elle puisse être démontée par extraction axiale ou bien en adoptant un autre mode de montage consistant à réaliser un nez de pulvérisateur amovible comportant la pièce allongée 5 et le bec 7, on facilite son démontage et on autorise un accès rapide à l'intérieur de l'appareil en vue de son nettoyage par exemple, ou du remplacement de la pièce allongée par une autre pièce de géométrie adaptée à l'obtention d'autres performances.By mounting the elongated part 5 so that it can be disassembled by axial extraction or by adopting another mounting method consisting in making a removable sprayer nose comprising the elongated part 5 and the spout 7, it is easier to disassemble and allows quick access to the interior of the device for cleaning, for example, or the replacement of the elongated part by another part of geometry suitable for obtaining other performance.

Bien entendu l'invention n'est pas limitée au mode de réalisation décrit et représenté et à l'application mentionnée qui n'ont été donnés qu'à titre d'exemple. Ainsi l'appareil suivant l'invention peut également être utilisé pour le refroidissement de profilés d'aluminium, de grosses poutrelles, ou la pulvérisation de liquides autres que des liquides de refroidissement tels que vernis, peinture etc... D'autre part l'appareil suivant l'invention pourrait fonctionner avec une orientation quelconque dans l'espace du bec de pulvérisation.Of course, the invention is not limited to the embodiment described and shown and to the application mentioned, which have been given only by way of example. Thus, the apparatus according to the invention can also be used for cooling aluminum profiles, large beams, or spraying liquids other than coolants such as varnish, paint, etc. 'Apparatus according to the invention could operate with any orientation in the space of the spray nozzle.

Claims (11)

  1. Device for linear spraying of a liquid, especially a cooling liquid, of the type which comprises, arranged in a chamber (1), means (3i,4) for supplying the liquid to an elongate spray nozzle (7) formed in the wall of the chamber and means for injecting gas into this chamber in order to spray the liquid supplied to the nozzle and to carry it away out of the chamber, comprising an elongate component (5) arranged in the chamber so as to be sprayed by the liquid leaving the supply means and characterized in that the liquid spreads out over a convex surface (51) of this component in order to be carried away by the gas and to flow out towards two elongate slits (81,82) adjacent to the nozzle (7) and converging on the latter, the width of these slits varying periodically and complementarily along their length so as to delimit two sheets of the liquid/gas mixture which interpenetrate in the region of the nozzle (7), forming, at the outlet of the latter, a liquid mist confined within a dihedron (α) opening out from the nozzle.
  2. Device in accordance with Claim 1, characterized in that each slit (81,82) is delimited by an internal wall part of the chamber and a surface (52,53) of the elongate component arranged opposite and which extends one end of the convex surface (51) of this component, the two surfaces (52,53) of the elongate component which each delimit one slit intersecting in the region of the spray nozzle(7).
  3. Device in accordance with Claim 2, characterized in that the said surfaces (52,53) of the elongate component which delimit the slits are hollowed out with notches (62,63) distributed uniformly along the entire length of the spray nozzle, the notches of one surface being longitudinally offset from the notches of the other surface.
  4. Device according to Claim 3, characterized in that the notches (62,63), along the longitudinal axis of the elongate component, have a fixed width equal to that of plane surface elements separating them, the notches of one of the surfaces of the elongate component being longitudinally offset from the notches of the other surface of this component by the width of these surface elements.
  5. Device according to Claim 4, characterized in that the notches have the shape of cavities (62,63) with a curved bottom.
  6. Device according to Claim 4, characterized in that the notches have a plane bottom.
  7. Device according to any one of Claims 4 to 6, characterized in that the surface elements separating the notches on the elongate component are plane.
  8. Device according to any one of the preceding claims, characterized in that the midplanes of the two slits define a dihedron of approximately 120° of aperture.
  9. Device according to any one of the preceding claims, characterized in that a deflecting skirt (9) is fixed to the device in the region of the spray nozzle (7) in order, by the Coanda effect, to increase the aperture angle (α) of the dihedron within which the nozzle sprays the liquid.
  10. Device according to any one of the preceding claims, characterized in that the liquid supply means are constituted by a pipe (4) arranged parallel to the spray nozzle (7), this pipe feeding a series of parallel tubes (31 to 317) fitted perpendicularly on the pipe and emerging in the vicinity of the curved surface (51) of the elongate component.
  11. Device according to any one of the preceding claims, characterized in that the liquid is water and the gas is air, both being fed under low pressure.
EP93920887A 1992-09-18 1993-09-16 Device for linear spraying of a liquid, particularly a cooling liquid Expired - Lifetime EP0660755B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9211164 1992-09-18
FR9211164A FR2695842B1 (en) 1992-09-18 1992-09-18 Apparatus for linear spraying of a liquid, in particular for cooling.
PCT/FR1993/000891 WO1994006569A1 (en) 1992-09-18 1993-09-16 Device for linear spraying of a liquid, particularly a cooling liquid

Publications (2)

Publication Number Publication Date
EP0660755A1 EP0660755A1 (en) 1995-07-05
EP0660755B1 true EP0660755B1 (en) 1996-10-23

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EP93920887A Expired - Lifetime EP0660755B1 (en) 1992-09-18 1993-09-16 Device for linear spraying of a liquid, particularly a cooling liquid

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US (1) US5628460A (en)
EP (1) EP0660755B1 (en)
DE (1) DE69305651T2 (en)
FR (1) FR2695842B1 (en)
WO (1) WO1994006569A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2759924B1 (en) * 1997-02-24 1999-04-30 Bertin & Cie APPARATUS FOR LINEAR SPRAYING OF A LIQUID, ESPECIALLY COOLING, AND COOLING TUNNEL EQUIPPED WITH SUCH APPARATUS
DE19820432A1 (en) * 1998-05-07 1999-11-11 Voith Sulzer Papiertech Patent Method and device for applying an application medium to a running surface
NZ525880A (en) * 2003-05-14 2005-11-25 Methven Ltd Method and apparatus for producing droplet spray
DE102010004172A1 (en) * 2010-01-07 2011-07-14 Fleissner GmbH, 63329 Device for impacting flat material by pressurized medium, has nozzle strips whose lower side is designed as surface inclinedly running in direction of discharging water jets, where lower side exhibits jet gap in extension direction
CN110743723A (en) * 2019-10-14 2020-02-04 大族激光科技产业集团股份有限公司 Atomization device
CN114434053B (en) * 2022-01-27 2024-07-19 江苏隆宝重工科技有限公司 Automatic welding manipulator with automatic control function and use method thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR16485E (en) * 1910-05-24 1913-02-06 Fritz Carl Wickel Unlimited width regular jet sprayer
FR533308A (en) * 1921-03-09 1922-02-27 Sprayer for liquid fuels
US3365137A (en) * 1966-05-09 1968-01-23 Diamond Int Corp Liquid dispenser head which develops a fan-like spray
FR2578449B1 (en) * 1985-03-06 1987-05-07 Bertin & Cie LINEAR SPRAYING DEVICE
FR2630350B1 (en) * 1988-04-22 1990-08-31 Bertin & Cie LINEAR SPRAYING DEVICE FOR SHEET COOLING WATER
US4903895A (en) * 1989-03-13 1990-02-27 John T. Mathewson Snow making nozzle assembly
DE4110127A1 (en) * 1991-03-27 1992-10-01 Herbert Huettlin NOZZLE ASSEMBLY FOR SPRAYING LIQUIDS

Also Published As

Publication number Publication date
DE69305651T2 (en) 1998-01-29
FR2695842B1 (en) 1994-12-30
WO1994006569A1 (en) 1994-03-31
US5628460A (en) 1997-05-13
FR2695842A1 (en) 1994-03-25
EP0660755A1 (en) 1995-07-05
DE69305651D1 (en) 1996-11-28

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