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EP0240377A1 - Device for spraying liquid - Google Patents

Device for spraying liquid Download PDF

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Publication number
EP0240377A1
EP0240377A1 EP87400349A EP87400349A EP0240377A1 EP 0240377 A1 EP0240377 A1 EP 0240377A1 EP 87400349 A EP87400349 A EP 87400349A EP 87400349 A EP87400349 A EP 87400349A EP 0240377 A1 EP0240377 A1 EP 0240377A1
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EP
European Patent Office
Prior art keywords
channels
ejection
plane
liquid
axis
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Granted
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EP87400349A
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German (de)
French (fr)
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EP0240377B1 (en
Inventor
Gérard Degli
Roger Tholome
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Sames SA
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Sames 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
    • B05B7/02—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
    • B05B7/0815—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 at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter

Definitions

  • the invention relates to a device for spraying liquid, in particular paints or varnishes and relates more particularly to an improvement of the atomizing nozzle of such a device, making it possible in all circumstances to obtain a better conformation of the jet of liquid. sprayed, in a relatively wide range, in particular for a relatively low liquid flow rate.
  • a liquid spraying device which uses compressed air both to atomize the liquid and to give the resulting beam a desired shape, for example in a relatively flat fan shape.
  • Such a device is described in particular in American patent N 8 2 646 314 and comprises a nozzle provided with a liquid ejection channel, axial, with a drive air ejection channel, for example annular and coaxial with the liquid ejection channel, oblique atomizing air ejection channels which converge downstream of the orifice of the liquid ejection channel and conformation air ejection channels, the ejection axes lie in a plane including the axis of the liquid ejection channel.
  • the various air ejection channels are generally supplied by two sources of compressed air, one for the conformation air ejection channels and the other for the other channels.
  • the pressure from the first source essentially makes it possible to adjust the width of the fan, that of the second source makes it possible to adjust the fineness of spraying.
  • the invention essentially relates to a liquid spraying device comprising an atomizing nozzle provided with a liquid ejection channel, with spray air ejection channels to create a divergent beam of sprayed liquid and air ejection channels for shaping said bundle, in particular first such channels whose ejection axes lie substantially in a predetermined plane including the axis of said liquid ejection channel and converge to give rise to a divergent flattened beam whose median plane is substantially perpendicular to said predetermined plane and contains said axis of said liquid ejection channel, characterized in that said nozzle comprises second conformation air ejection channels whose ejection axes are oriented on either side of said plane predetermined and symmetrically with respect thereto, in the direction of said median plane.
  • the first aforementioned channels are formed in the horns of the nozzle, projecting parallel to the axial direction of ejection of the liquid and their orifices open onto the internal faces opposite these horns.
  • the aforementioned second ejection channels are also located in these horns and open on the same internal faces, downstream of the orifices of said first channels relative to the direction of propagation of the jet.
  • the atomizing nozzle 11 approximately cylindrical, of a spraying device with compressed air, enclosing different channels emerging through corresponding orifices on a circular surface 12 of the nozzle or on the internal surfaces.
  • two horns 13 parallel and projecting from the sides of said circular surface 12.
  • the channels 18 are supplied by a source of compressed air and the channels 16, 17 and 19 are supplied by another source of compressed air to allow the adjustments indicated above.
  • the separation between the duct elements supplying these two groups of channels is ensured by means of an annular piece 20 also centering the axial duct in which the channel 15 is defined.
  • the PM plane including the X'X axis and perpendicular to the plane P is defined as being the desired median plane of the fan beam 21 of sprayed liquid.
  • second conformation air ejection channels 25 situated in the horns 13, on either side of the plane P containing the channels 18.
  • the orifices 25a of these second channels open onto the facing surfaces of the horns 13 and the axes of ejection of these channels are oriented on either side of the plane P and symmetrically relative to the latter towards the median plane PM.
  • there are two pairs of second channels 25 whose axes of ejection converge in pairs at points C 1 ' C 2 , substantially in the median plane PM, on either side of the axis X'X and downstream of the points of convergence B 1 , B 2 of the axes of ejection of the first channels 18.
  • the first channels 18 formed in each horn 13 are substantially parallel and the two second channels 25 of the same horn, located in the same plane on either side of the plane P are themselves in a plane substantially parallel to the axial direction of a channel 18 formed in the same horn. If the channels 18 were not parallel, then the plane of the channels 25 would advantageously be substantially parallel to the axis of the nearest channel 18.
  • the plane containing the second channels 25 of the same horn makes an angle of about 68 ° with the axis X'X.
  • the second channels of each horn make an angle of about 36 * between them:
  • Their orifices 25a are located approximately 2mm downstream from the orifice of the or the nearest first mentioned channel of the same horn.
  • the orifices 25a of these two second channels formed in the same horn are spaced about 2mm apart.
  • the second channels all have the same diameter and this diameter is less than that of the first channels.
  • the diameter of the second channels 25 is preferably substantially equal to the diameter of the spray air ejection channels 17 or to that of the channels 19.
  • this diameter is approximately 0.5 mm. It goes without saying, however, that all the figures which have just been indicated are purely indicative and correspond to a specific embodiment which has given good results. Many other combinations of diameters and channel orientations are possible.
  • the role of the second channels 25, directing air jets on the sides of the fan beam 21, is twofold. On the one hand, it contributes to "flattening" the jet of sprayed liquid, therefore to widening the fan-shaped beam 21.
  • the air jets coming from the channels 25 contribute to "filling" the hollow possibly created in the vicinity of the axis X'X by the air jets coming from the channels 18.
  • the section of the fan beam 21 is therefore much closer to the desired oblong section.

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Abstract

Dispositif de pulvérisation de peintures ou de vernis utilisant de l'air comprimé pour former et conformer le faisceau de liquide atomisé. La buse (11) du dispositif d'atomisation comprend classiquement des premiers canaux d'éjection d'air de conformation (18) pratiqués dans des cornes (13) pour donner au faisceau (21) une forme d'éventail relativement plat et selon l'invention, les cornes (13) comprotent également des seconds cvanaux d'éjection d'air de conformation (25) orientés vers les côtés du faisceau (21) pour améliorer sa forme et son homogénéité, notamment aux faibles débits de liquide. Application à la peinture industrielle.Device for spraying paints or varnishes using compressed air to form and shape the bundle of atomized liquid. The nozzle (11) of the atomization device conventionally comprises first conformation air ejection channels (18) formed in horns (13) to give the bundle (21) a relatively flat fan shape and according to the Invention, the horns (13) also include second conformation air ejection channels (25) oriented towards the sides of the bundle (21) to improve its shape and its homogeneity, in particular at low liquid flow rates. Application to industrial painting.

Description

L'invention se rapporte à un dispositif de pulvérisation de liquide, notamment de peintures ou vernis et concerne plus particulièrement un perfectionnement de la buse d'atomisation d'un tel dispositif, permettant d'obtenir en toutes circonstances une meilleure conformation du jet de liquide pulvérisé, en éventail relativement large, notamment pour un débit de liquide relativement faible.The invention relates to a device for spraying liquid, in particular paints or varnishes and relates more particularly to an improvement of the atomizing nozzle of such a device, making it possible in all circumstances to obtain a better conformation of the jet of liquid. sprayed, in a relatively wide range, in particular for a relatively low liquid flow rate.

On connaît un dispositif de pulvérisation de liquide utilisant l'air comprimé à la fois pour atomiser le liquide et pour donner au faisceau résultant une forme souhaitée, par exemple en éventail relativement plat. Un tel dispositif est notamment décrit dans le brevet américain N8 2 646 314 et comprend une buse munie d'un canal d'éjection de liquide, axial, d'un canal d'éjection d'air d'entraînement, par exemple annulaire et coaxial au canal d'éjection de liquide, de canaux d'éjection d'air de pulvérisation, obliques, qui convergent en aval de l'orifice du canal d'éjection de liquide et de canaux d'éjection d'air de conformation dont les axes d'éjection se situent dans un plan incluant l'axe du canal d'éjection de liquide. Ces derniers convergent vers l'avant de la buse pour "aplatir" le faisceau divergent de liquide atomisé et lui donner ainsi la forme souhaitée d'éventail relativement plat présentant une section transversale approximativement oblongue. Les différents canaux d'éjection d'air sont généralement alimentés par deux sources d'air comprimé, l'une pour les canaux d'éjection d'air de conformation et l'autre pour les autres canaux. La pression de la première source permet essentiellement d'ajuster la largeur de l'éventail, celle de la seconde source permet d'ajuster la finesse de pulvérisation.A liquid spraying device is known which uses compressed air both to atomize the liquid and to give the resulting beam a desired shape, for example in a relatively flat fan shape. Such a device is described in particular in American patent N 8 2 646 314 and comprises a nozzle provided with a liquid ejection channel, axial, with a drive air ejection channel, for example annular and coaxial with the liquid ejection channel, oblique atomizing air ejection channels which converge downstream of the orifice of the liquid ejection channel and conformation air ejection channels, the ejection axes lie in a plane including the axis of the liquid ejection channel. These converge towards the front of the nozzle to "flatten" the divergent bundle of atomized liquid and thus give it the desired shape of relatively flat fan having an approximately oblong cross section. The various air ejection channels are generally supplied by two sources of compressed air, one for the conformation air ejection channels and the other for the other channels. The pressure from the first source essentially makes it possible to adjust the width of the fan, that of the second source makes it possible to adjust the fineness of spraying.

Un autre paramètre important à prendre en considération est le débit de liquide. Le bon choix du nombre, du diamètre, des positions respectives et des orientations des différents canaux permet, en combinaison avec le choix des pressions d'air, d'obtenir des résultats satisfaisants pour une certaine gamme de débits. Cependant, les réglages sont délicats car les actions de tous les jets d'air interfèrent entre elles.Another important parameter to consider is the liquid flow rate. The right choice of number, diameter, respective positions and orientations of the different channels allows, in combination with the choice of air pressures, to obtain results satisfactory for a certain range of flow rates. However, the settings are delicate because the actions of all the air jets interfere with each other.

Il est en particulier difficile d'obtenir un jet large (c'est-à-dire par exemple un éventail très ouvert de 50 a 60cm à une distance de 25 à 30cm de la buse) pour un faible débit de liquide (typiquement 100 à 200cm3 par minute). Dans de telles circonstances, on observe, suivant les réglages, des anomalies de pulvérisation telles que: un jet trop étroit, ou bien un jet creusé, voire coupé en deux, au voisinage du plan précité dans lequel se situe l'axe du canal d'éjection de liquide ou bien encore une pulvérisation non homogène et notamment grossière à la périphérie du jet. On attribue ces phénomènes au fait qu'aux faibles débits de liquide, la pression d'air de pulvérisation doit être réduite de sorte que le jet ne peut plus "résister" convenablement à l'action des jets d'air de conformation, nécessairement violente pour obtenir une grande ouverture de faisceau, ceci en dépit d'un choix aussi approprié que possible des diamètres des différents canaux d'éjection d'air. L'invention a notamment pour but de résoudre ce problème.It is in particular difficult to obtain a wide jet (that is to say for example a very open fan of 50 to 60 cm at a distance of 25 to 30 cm from the nozzle) for a low flow of liquid (typically 100 to 200cm 3 per minute). Under such circumstances, we observe, depending on the settings, spray anomalies such as: a too narrow jet, or a jet dug, or even cut in half, near the aforementioned plane in which the axis of the canal d ejection of liquid or even a non-homogeneous and in particular coarse spraying at the periphery of the jet. These phenomena are attributed to the fact that at low liquid flow rates, the atomizing air pressure must be reduced so that the jet can no longer adequately "resist" the action of conformation air jets, which are necessarily violent. to obtain a large beam opening, this in spite of as suitable a choice as possible of the diameters of the different air ejection channels. The invention particularly aims to solve this problem.

Dans ce but, l'invention concerne essentiellement un dispositif de pulvérisation de liquide comportant une buse d'atomisation munie d'un canal d'éjection de liquide, de canaux d'éjection d'air de pulvérisation pour créer un faisceau divergent de liquide pulvérisé et de canaux d'éjection d'air de conformation dudit faisceau, notamment de premiers tels canaux dont les axes d'éjection se situent sensiblement dans un plan prédéterminé incluant l'axe dudit canal d'éjection de liquide et convergent pour donner naissance à un faisceau aplati divergent dont le plan médian est sensiblement perpendiculaire audit plan prédéterminé et contient ledit axe dudit canal d'éjection de liquide, caractérisé en ce que ladite buse comporte des seconds canaux d'éjection d'air de conformation dont les axes d'éjection sont orientés de part et d'autre dudit plan prédéterminé et symétriquement par rapport à celui-ci, en direction dudit plan médian.For this purpose, the invention essentially relates to a liquid spraying device comprising an atomizing nozzle provided with a liquid ejection channel, with spray air ejection channels to create a divergent beam of sprayed liquid and air ejection channels for shaping said bundle, in particular first such channels whose ejection axes lie substantially in a predetermined plane including the axis of said liquid ejection channel and converge to give rise to a divergent flattened beam whose median plane is substantially perpendicular to said predetermined plane and contains said axis of said liquid ejection channel, characterized in that said nozzle comprises second conformation air ejection channels whose ejection axes are oriented on either side of said plane predetermined and symmetrically with respect thereto, in the direction of said median plane.

Généralement les premiers canaux précités sont pratiqués dans des cornes de la buse, faisant saillie parallèlement à la direction axiale d'éjection du liquide et leurs orifices débouchent sur les faces internes en regard de ces cornes.Generally the first aforementioned channels are formed in the horns of the nozzle, projecting parallel to the axial direction of ejection of the liquid and their orifices open onto the internal faces opposite these horns.

Selon un mode de réalisation préféré de l'invention, les seconds canaux d'éjection précités sont aussi situés dans ces cornes et débouchent sur les mêmes faces internes, en aval des orifices desdits premiers canaux par rapport au sens de propagation du jet.According to a preferred embodiment of the invention, the aforementioned second ejection channels are also located in these horns and open on the same internal faces, downstream of the orifices of said first channels relative to the direction of propagation of the jet.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre, d'un mode de réalisation d'un dispositif conforme à son principe, donnée uniquement à titre d'exemple, et faite en référence aux dessins annexés dans lesquels:

  • - la figure 1 est une vue générale en perspective de la buse d'un dispositif de pulvérisation de liquide conforme à l'invention;
  • - la figure 2 est une coupe axiale II-II de la figure 1; et
  • - la figure 3 est une coupe partielle III-III de la figure 1.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the description which follows, of an embodiment of a device in accordance with its principle, given solely by way of example , and made with reference to the accompanying drawings in which:
  • - Figure 1 is a general perspective view of the nozzle of a liquid spraying device according to the invention;
  • - Figure 2 is an axial section II-II of Figure 1; and
  • - Figure 3 is a partial section III-III of Figure 1.

En se reportant aux dessins, on a représenté la buse d'atomisation 11, approximativement cylindrique, d'un dispositif de pulvérisation à air comprimé, renfermant différents canaux débouchant par des orifices correspondants sur une surface circulaire 12 de la buse ou sur les surfaces internes de deux cornes 13 parallèles et faisant saillie sur les côtés de ladite surface circulaire 12.Referring to the drawings, there is shown the atomizing nozzle 11, approximately cylindrical, of a spraying device with compressed air, enclosing different channels emerging through corresponding orifices on a circular surface 12 of the nozzle or on the internal surfaces. two horns 13 parallel and projecting from the sides of said circular surface 12.

De façon connue, la buse 11 est munie des canaux suivants:

  • - un canal d'éjection de liquide 15, axial, débouchant par un orifice 15a au centre de la surface circulaire 12; l'axe d'éjection du liquide est l'axe X'X sur les dessins,
  • - un canal d'éjection d'air d'entrainement 16 à section annulaire, agencé coaxialement au canal 15 et débouchant par un orifice annulaire 16a sur la surface circulaire 12,
  • - des canaux d'éjection d'air de pulvérisation 17, obliques par rapport à l'axe X'X et dont les axes d'éjection convergent en A sur cet axe, en aval de l'orifice 15â, par rapport au sens d'éjection du liquide; les orifices 17a de ces canaux débouchent également sur la surface 12,
  • - des premiers canaux d'éjection d'air de conformation 18, pratiqués dans les cornes 13, obliques par rapport à l'axe X'X, agencés par paires et sensiblement situés dans un plan prédéterminé P contenant cet axe; les orifices 18a desdits premiers canaux débouchent sur les faces en regard des cornes 13-et les axes de ces canaux convergent deux à deux sur l'axe X'X en des points B1, B2 ... échelonnés le long de cet axe, en aval du point A (le plan P mentionné ci-dessus est aussi le plan de coupe de la figure 2),
  • - des canaux d'éjection d'air 19 situés ici dans le même plan P que les canaux 18, et dont les orifices 19a débouchent sur la surface circulaire 12; les jets d'air issus de ces canaux évitent que des éclaboussures de liquide pulvérisé ne viennent se déposer sur les cornes 13, en outre ils "écrasent" légèrement les jets d'air issus des orifices 18a, ce qui contribue à.éviter que ceux-ci creusent ou coupent le faisceau au voisinage du plan P.
In known manner, the nozzle 11 is provided with the following channels:
  • - A liquid ejection channel 15, axial, opening through an orifice 15a in the center of the circular surface 12; the liquid ejection axis is the X'X axis on the drawings,
  • a drive air ejection channel 16 with an annular section, arranged coaxially with the channel 15 and emerging through an annular orifice 16a on the circular surface 12,
  • - Spray air ejection channels 17, oblique to the axis X'X and whose ejection axes converge at A on this axis, downstream of the orifice 15â, relative to the direction d ejection of the liquid; the orifices 17a of these channels also open onto the surface 12,
  • - First air ejection channels 18, formed in the horns 13, oblique to the axis X'X, arranged in pairs and substantially located in a predetermined plane P containing this axis; the orifices 18a of said first channels open onto the opposite faces of the horns 13 - and the axes of these channels converge two by two on the axis X'X at points B 1 , B 2 ... staggered along this axis , downstream from point A (the plane P mentioned above is also the section plane of FIG. 2),
  • - Air ejection channels 19 located here in the same plane P as the channels 18, and whose orifices 19a open onto the circular surface 12; the air jets from these channels prevent splashes of sprayed liquid from being deposited on the horns 13, in addition they slightly "crush" the air jets from the orifices 18a, which contributes to avoiding that those -this dig or cut the beam in the vicinity of the plane P.

Classiquement, les canaux 18 sont alimentés par une source d'air comprimé et les canaux 16, 17 et 19 sont alimentés par une autre source d'air comprimé pour permettre les réglages indiqués plus haut. La séparation entre les éléments de conduit alimentant ces deux groupes de canaux est assurée grâce à une pièce annulaire 20 réalisant également le centrage du conduit axial dans lequel est défini le canal 15.Conventionally, the channels 18 are supplied by a source of compressed air and the channels 16, 17 and 19 are supplied by another source of compressed air to allow the adjustments indicated above. The separation between the duct elements supplying these two groups of channels is ensured by means of an annular piece 20 also centering the axial duct in which the channel 15 is defined.

Le plan PM comprenant l'axe X'X et perpendiculaire au plan P se définit comme étant le plan médian souhaité du faisceau en éventail 21 de liquide pulvérisé.The PM plane including the X'X axis and perpendicular to the plane P is defined as being the desired median plane of the fan beam 21 of sprayed liquid.

A ces dispositions connues, s'ajoutent, selon l'invention, des seconds canaux d'éjection d'air de conformation 25 situés dans les cornes 13, de part et d'autre du plan P contenant les canaux 18. Les orifices 25a de ces seconds canaux débouchent sur les surfaces en regard des cornes 13 et les axes d'éjection de ces canaux sont orientés de part et d'autre du plan P et symétriquement par rapport à celui-ci vers le plan médian PM. Dans l'exemple représenté, on compte deux paires de seconds canaux 25 dont les axes d'éjection convergent deux à deux en des points C1' C2, sensiblement dans le plan médian PM, de part et d'autre de l'axe X'X et en aval des points de convergence B1, B2 des axes d'éjection des premiers canaux 18.To these known arrangements, there are added, according to the invention, second conformation air ejection channels 25 situated in the horns 13, on either side of the plane P containing the channels 18. The orifices 25a of these second channels open onto the facing surfaces of the horns 13 and the axes of ejection of these channels are oriented on either side of the plane P and symmetrically relative to the latter towards the median plane PM. In the example shown, there are two pairs of second channels 25 whose axes of ejection converge in pairs at points C 1 ' C 2 , substantially in the median plane PM, on either side of the axis X'X and downstream of the points of convergence B 1 , B 2 of the axes of ejection of the first channels 18.

Dans l'exemple représenté, les premiers canaux 18 pratiqués dans chaque corne 13 sont sensiblement parallèles et les deux seconds canaux 25 de la même corne, situés dans un même plan de part et d'autre du plan P sont eux-mêmes dans un plan sensiblement parallèle à la direction axiale d'un canal 18 pratiqué dans la même corne. Si les canaux 18 n'étaient pas parallèles, alors le plan des canaux 25 serait avantageusement sensiblement parallèle à l'axe du canal 18 le plus proche. Le plan contenant les seconds canaux 25 d'une même corne fait un angle d'environ 68° avec l'axe X'X. Par ailleurs, les seconds canaux de chaque corne font entre eux un angle de 36* environ: Leurs orifices 25a sont situés à environ 2mm en aval de l'orifice du ou du plus proche premier canal précité de la même corne. De préférence,les orifices 25a de ces deux seconds canaux pratiqués dans une même corne sont distants d'environ 2mm.In the example shown, the first channels 18 formed in each horn 13 are substantially parallel and the two second channels 25 of the same horn, located in the same plane on either side of the plane P are themselves in a plane substantially parallel to the axial direction of a channel 18 formed in the same horn. If the channels 18 were not parallel, then the plane of the channels 25 would advantageously be substantially parallel to the axis of the nearest channel 18. The plane containing the second channels 25 of the same horn makes an angle of about 68 ° with the axis X'X. Furthermore, the second channels of each horn make an angle of about 36 * between them: Their orifices 25a are located approximately 2mm downstream from the orifice of the or the nearest first mentioned channel of the same horn. Preferably, the orifices 25a of these two second channels formed in the same horn are spaced about 2mm apart.

Selon le mode de réalisation décrit, les seconds canaux ont tous le même diamètre et ce diamètre est inférieur à celui des premiers canaux. Le diamètre des seconds canaux 25 est de préférence sensiblement égal au diamètre des canaux d'éjection d'air de pulvérisation 17 ou à celui des canaux 19.According to the embodiment described, the second channels all have the same diameter and this diameter is less than that of the first channels. The diameter of the second channels 25 is preferably substantially equal to the diameter of the spray air ejection channels 17 or to that of the channels 19.

Dans l'exemple décrit, ce diamètre est d'environ 0,5mm. Il va de soi cependant, que tous les chiffres qui viennent d'être indiqués sont purement indicatifs et correspondent à un mode de réalisation spécifique ayant donné de bons résultats. De nombreuses autres combinaisons de diamètres et d'orientations des canaux sont possibles.In the example described, this diameter is approximately 0.5 mm. It goes without saying, however, that all the figures which have just been indicated are purely indicative and correspond to a specific embodiment which has given good results. Many other combinations of diameters and channel orientations are possible.

Le rôle des seconds canaux 25, dirigeant des jets d'air sur les côtés du faisceau en éventail 21, est double. D'une part, il contribue à "aplatir" le jet de liquide pulvérisé donc à élargir le faisceau en éventail 21.The role of the second channels 25, directing air jets on the sides of the fan beam 21, is twofold. On the one hand, it contributes to "flattening" the jet of sprayed liquid, therefore to widening the fan-shaped beam 21.

Par ailleurs, en repoussant du liquide atomisé vers le centre du faisceau, les jets d'air issus des canaux 25 contribuent à "combler" le creux éventuellement créé au voisinage de l'axe X'X par les jets d'air issus des canaux 18. La section du faisceau en éventail 21 est donc beaucoup plus proche de la section oblongue souhaitée.Furthermore, by pushing atomized liquid towards the center of the beam, the air jets coming from the channels 25 contribute to "filling" the hollow possibly created in the vicinity of the axis X'X by the air jets coming from the channels 18. The section of the fan beam 21 is therefore much closer to the desired oblong section.

Claims (10)

1- Dispositif de pulvérisation de liquide comportant une buse d'atomisation (11) munie: d'un canal d'éjection de liquide (15), de canaux d'éjection d'air de pulvérisation (17) pour créer un faisceau divergent de liquide pulvérisé et de canaux d'éjection d'air de conformation dudit faisceau, notamment de premiers tels canaux (18)..dont les axes d'éjection se situent sensiblement dans un plan prédéterminé (P) incluant l'axe (X'X) dudit canal d'éjection de liquide et convergent pour donner naissance à un faisceau aplati divergent (21) dont le plan médian (PM) est sensiblement perpendiculaire audit plan prédéterminé et contient ledit axe dudit canal d'éjection de liquide, caractérisé en ce que ladite buse comporte des seconds canaux d'éjection d'air de conformation (25) dont les axes d'éjection sont orientés de part et d'autre dudit plan prédétermine (P) et symétriquement par rapport à celui-ci, en direction dudit plan médian.1- Liquid spraying device comprising an atomizing nozzle (11) provided with: a liquid ejection channel (15), spray air ejection channels (17) to create a divergent beam of sprayed liquid and air ejection channels for shaping said bundle, in particular first such channels (18). . whose ejection axes lie substantially in a predetermined plane (P) including the axis (X'X) of said liquid ejection channel and converge to give rise to a divergent flattened beam (21) whose median plane ( PM) is substantially perpendicular to said predetermined plane and contains said axis of said liquid ejection channel, characterized in that said nozzle comprises second conformation air ejection channels (25) whose ejection axes are oriented on either side of said predetermined plane (P) and symmetrically with respect thereto, in the direction of said median plane. 2- Dispositif de pulvérisation selon la revendication 1, caractérisé en ce qu'il comporte au moins deux paires de tels seconds canaux (25), les canaux de chaque paire étant situés de part et d'autre dudit plan médian (PM), et en ce que les axes d'éjection desdits seconds canaux convergent (C1,C2) deux à deux sensiblement dans ledit plan médian (PM), de part et d'autre.de l'axe d'éjection de liquide (X'X) et en aval des axes d'éjection desdits premiers canaux, par rapport au sens de propagation dudit faisceau.2- Spray device according to claim 1, characterized in that it comprises at least two pairs of such second channels (25), the channels of each pair being located on either side of said median plane (PM), and in that the ejection axes of said second channels converge (C 1 , C 2 ) two by two substantially in said median plane ( PM ), on either side of the liquid ejection axis ( X ' X ) and downstream of the ejection axes of said first channels, relative to the direction of propagation of said beam. 3- Dispositif de pulvérisation selon la revendication 1 ou 2, du type dans lequel ladite buse (11) est munie de deux cornes (13) faisant saillie parallèlement audit axe d'éjection de liquide (X'X) et dans lesquelles sont forés les premiers canaux (18) précités, caractérisé en ce que les seconds canaux (25) précités sont également forés dans lesdites cornes.3- spraying device according to claim 1 or 2, of the type in which said nozzle (11) is provided with two horns (13) projecting parallel to said liquid ejection axis (X'X) and in which are drilled first aforementioned first channels (18), characterized in that the aforementioned second channels (25) are also drilled in said horns. 4- Dispositif de pulvérisation selon la revendication 3, caractérisé en ce que lesdits seconds canaux pratiqués (25) dans chaque corne (13), sont situés dans un plan sensiblement parallèle à la direction axiale d'un premier canal pratiqué dans la même corne.4- Spray device according to claim 3, characterized in that said second channels formed (25) in each horn (13), are located in a plane substantially parallel to the axial direction of a first channel formed in the same horn. 5- Dispositif de pulvérisation selon la revendication 4, caractérisé en ce que ce plan fait un angle de 68* environ par rapport à l'axe du canal d'éjection dé liquide (X'X).5- Spray device according to claim 4, characterized in that this plane makes an angle of 68 * approximately with respect to the axis of the liquid ejection channel (X'X). 6- Dispositif de pulvérisation selon la revendication 4 ou 5, caractérisé en ce que les seconds canaux (25) de chaque corne font entre eux un angle d'environ 36°.6- spraying device according to claim 4 or 5, characterized in that the second channels (25) of each horn form between them an angle of about 36 °. 7- Dispositif de pulvérisation selon l'une des revendications 4 à 6, caractérisé en ce que les orifices (25a) des seconds canaux (25) sont situés à environ 2mm en aval de l'orifice (18a) du ou du plus proche premier canal précité de la même corne.7- Spray device according to one of claims 4 to 6, characterized in that the orifices (25a) of the second channels (25) are located approximately 2mm downstream of the orifice (18a) of the or nearest first aforementioned canal of the same horn. 8- Dispositif de pulvérisation selon la revendication 7, caractérisé en ce que les orifices (25a) des deux seconds canaux de chaque corne sont distants d'environ 2mm.8- Spraying device according to claim 7, characterized in that the orifices (25a) of the two second channels of each horn are spaced about 2mm. 9- Dispositif de pulvérisation selon l'une des revendications précédentes, caractérisé en ce que lesdits seconds canaux (25) ont, chacun, un diamètre sensiblement égal au diamètre des canaux d'éjection d'air de pulvérisation (17).9- Spray device according to one of the preceding claims, characterized in that said second channels (25) each have a diameter substantially equal to the diameter of the spray air ejection channels (17). 10- Dispositif de pulvérisation selon l'une des revendications précédentes, caractérisé en ce que lesdits seconds canaux ont, chacun, un diamètre sensiblement égal à 0,5mm.10- Spray device according to one of the preceding claims, characterized in that said second channels, each have a diameter substantially equal to 0.5mm.
EP87400349A 1986-02-28 1987-02-18 Device for spraying liquid Expired - Lifetime EP0240377B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8602801 1986-02-28
FR8602801A FR2595059B1 (en) 1986-02-28 1986-02-28 LIQUID SPRAYING DEVICE

Publications (2)

Publication Number Publication Date
EP0240377A1 true EP0240377A1 (en) 1987-10-07
EP0240377B1 EP0240377B1 (en) 1990-02-21

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ID=9332632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400349A Expired - Lifetime EP0240377B1 (en) 1986-02-28 1987-02-18 Device for spraying liquid

Country Status (6)

Country Link
US (1) US4767057A (en)
EP (1) EP0240377B1 (en)
JP (1) JPS62204873A (en)
DE (1) DE3761722D1 (en)
ES (1) ES2012805B3 (en)
FR (1) FR2595059B1 (en)

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Also Published As

Publication number Publication date
EP0240377B1 (en) 1990-02-21
ES2012805B3 (en) 1990-04-16
DE3761722D1 (en) 1990-03-29
US4767057A (en) 1988-08-30
FR2595059B1 (en) 1988-06-17
FR2595059A1 (en) 1987-09-04
JPS62204873A (en) 1987-09-09

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