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EP2100668A1 - Spray nozzle and liquid spraying device comprising said spray nozzle - Google Patents

Spray nozzle and liquid spraying device comprising said spray nozzle Download PDF

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Publication number
EP2100668A1
EP2100668A1 EP09155141A EP09155141A EP2100668A1 EP 2100668 A1 EP2100668 A1 EP 2100668A1 EP 09155141 A EP09155141 A EP 09155141A EP 09155141 A EP09155141 A EP 09155141A EP 2100668 A1 EP2100668 A1 EP 2100668A1
Authority
EP
European Patent Office
Prior art keywords
channel
nozzle
longitudinal axis
arc
liquid
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.)
Granted
Application number
EP09155141A
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German (de)
French (fr)
Other versions
EP2100668B1 (en
Inventor
Patrick Ballu
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.)
Exel Industries SA
Original Assignee
Exel Industries SA
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Filing date
Publication date
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Publication of EP2100668A1 publication Critical patent/EP2100668A1/en
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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
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/048—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like having a flow conduit with, immediately behind the outlet orifice, an elongated cross section, e.g. of oval or elliptic form, of which the major axis is perpendicular to the plane of the jet

Definitions

  • the present invention relates to a liquid spray nozzle, in particular high pressure coating liquid.
  • the invention relates to a liquid sprayer, in particular a high-pressure coating liquid, comprising such a nozzle.
  • a liquid sprayer generally comprises a spray nozzle, sometimes several, which is (are) mounted at the downstream end of the sprayer.
  • upstream and downstream are used herein with reference to the flow direction of the liquid in the sprayer.
  • upstream refers to elements on the side of the sprayer where the liquid to be sprayed from a power source arrives.
  • downstream refers to elements on the side of the sprayer where the liquid is sprayed into droplets.
  • Such a spray can be for example intended to spray coating liquids, such as water-soluble or solvent type paints.
  • the sprayer is connected, via one or more pipes (x), to a pump for putting the liquid under high pressure, for example under 70 bar. Spraying is carried out at the downstream end of the nozzle, which has a geometry determined according to the desired shape for the jet of the droplets of the sprayed liquid.
  • the nozzle 1 comprises a body 2 which defines, on the upstream side, a chamber 3 through which the liquid arrives and, downstream side, a channel 4 for bringing the liquid from the chamber 3 to the outlet of the nozzle 1.
  • the chamber 3 and the channel 4 extend along a longitudinal axis X 1 -X ' 1 of the nozzle 1.
  • the nozzle 1 comprises a slot 6 intended to form the jet of liquid in a flat jet.
  • the slot 6 is formed by two surfaces 61 and 62 which are flat, which converge towards the channel 4 and which are disposed on either side of a plane P 6 comprising the axis X 1 -X ' 1 .
  • the blind bottom of the channel 4 obtained in the body 2, before milling the slot 6, has the shape of a hollow dome 5, which is designated here by the word "dome".
  • the dome 5 connects the channel 4 and the slot 6.
  • the dome 5 has an ogival shape or a hemispherical shape, whose length is of the order of the diameter of the channel 4. As shown in FIG. figure 2 , the intersection of the dome 5 with the surfaces 61 and 62 of the slot 6 defines an outlet orifice 7 of the nozzle 1 generally elliptical flattened.
  • the geometry of the orifice 7 conforms the jet into an elliptical section cone.
  • the flow of sprayed liquid is not evenly distributed in this elliptical section.
  • it has higher concentrations towards the far edges of the ellipse.
  • horn effect In the field of spraying coating liquid, such a distribution of the liquid is called "horn effect". It has been found that the farther the edges of the ellipse are rounded, the greater the "horns" are important in the flow of liquid.
  • the effect of horns has the disadvantage of generating asymmetrical wear of the nozzle 1, by further digging the edges of the orifice 7. This wear is all the more important that the sprayed liquid is abrasive. This wear increases the "horn effect” and therefore causes a deterioration in the quality of the spray. In addition, it reduces the life of the nozzle 1, including when the material of the body 2 has a high hardness.
  • GB-A-1,312,052 discloses a flat jet nozzle comprising a discontinuity at the junction between the channel and the dome connecting the channel and the slot of the nozzle.
  • a nozzle according to GB-A-1,312,052 does not significantly reduce the effect of "horns" to obtain a satisfactory spray quality.
  • the present invention aims in particular to remedy these drawbacks, by proposing a spray nozzle of lifetime superior and making it possible to achieve a flat jet with a relatively uniform distribution of the liquid, thus improving the quality of spraying.
  • the length of the dome, taken parallel to the longitudinal axis, represents less than 50%, preferably between 20% and 45%, of the largest transverse dimension of the channel, taken in a plane orthogonal to the longitudinal axis.
  • This nozzle is characterized in that the dome has a symmetrical flat section with respect to the longitudinal axis, said flat section being defined by at least two arcs of circles which extend between a downstream end portion of the channel and the longitudinal axis and have different radii and centers on the canal side.
  • the subject of the invention is a liquid atomizer, in particular a high-pressure coating liquid, characterized in that it comprises a nozzle as explained above.
  • the nozzle 101 comprises a body 102 which defines, on the upstream side, a chamber 103 through which the liquid arrives and, on the downstream side, a channel 104 for bringing the liquid from the chamber 103 to the outlet of the nozzle 101.
  • the meaning of flow of fluid through the nozzle 101 is represented by an arrow F, which thus identifies the upstream and downstream sides of the nozzle 101.
  • the chamber 103 and the channel 104 extend along a longitudinal axis X 101 -X ' 101 of the nozzle 101.
  • the channel 104 is generally in the form of a cylinder of axis X 101 -X ' 101 and circular base of diameter D 104 .
  • the nozzle 101 Downstream of the channel 104, the nozzle 101 includes a slot 106 for shaping the jet of liquid into a flat stream.
  • the slot 106 is formed by two surfaces 161 and 162 which are flat, which converge towards the channel 104 and which are disposed on either side of a plane P 106 comprising the axis X 101 -X ' 101 .
  • the nozzle 101 further comprises a dome 105 connecting the channel 104 and the slot 106.
  • the term “dome” designates the blind bottom of the channel 104, which is obtained in the body 102 before milling the slot 106. By “connecting” it is intended to put fluid into communication.
  • the length L 105 of the dome 105 taken parallel to the longitudinal axis X 101 -X ' 101 , here represents 25% of the diameter D 104 of the channel 104.
  • the length L 105 of the dome 105 represents less than 50% of the D 104 diameter of the channel 104, preferably between 20% and 45%.
  • the dome 105 has a short or flattened shape with respect to the dome 5 of the nozzle 1 according to the prior art illustrated in FIG. figure 1 .
  • the tubular channel of the nozzle object of the invention may, in a variant, have a prismatic shape or a cylindrical shape with a non-circular base, for example an elliptical base.
  • the length of the dome is less than 50%, preferably between 20% and 45%, of the largest transverse dimension of the channel, taken in a plane orthogonal to the longitudinal axis of the nozzle.
  • the dome 105 has a symmetry of revolution about the axis X 101 -X ' 101 .
  • a section of the dome 105 by a plane containing the axis X 101 -X ' 101 , for example by the plane P 106 is defined by two arcs of circles C 1051 and C 1052 which extend between a downstream end portion 1041 of the channel 104 and the X axis 101 -X ' 101 .
  • the arcs of circles C 1051 and C 1052 have respective radii R 1051 and R 1052 and respective centers O 1051 and O 1052 located on the side of channel 104, that is to say opposite the downstream part. of the slot 106.
  • the two arcs C ' 1051 and C' 1052 extend between the end portion 1041 of the channel 104 and the axis X 101 -X ' 101 , symmetrically with the arcs C 1051 and C 1052 with respect to the axis X 101 - X ' 101 .
  • the radius R 1051 is relatively small in front of the radius R 1052 .
  • the radius R 1051 is less than half the diameter D 104 , which represents both the smallest and the largest transverse dimension of the channel 104.
  • transverse is meant a dimension taken in a plane orthogonal to the longitudinal axis X 101 -X ' 101 .
  • the radius R 1052 is greater than half the diameter D 104 of the channel 104.
  • the circular arc C 1051 is tangent to the end portion 1041 of the channel 104 and the circular arc C 1052 is tangent to the circular arc C 1051 .
  • the arcs C 1051 and C 1052 are connected continuously and without singularity.
  • the geometry of arches C ' 1051 and C' 1052 is identical to that of arcs C 1051 and C 1052 .
  • the dome 105 thus has a generally trapezoidal shape or a convergent half-lens shape.
  • the shape of the dome 105 could be composed of more than two arcs of circles connected to each other.
  • the radius of the arc closest to the downstream end of the channel is less than half of the largest transverse dimension of the channel
  • the radius of the arc farthest from the part end of the channel is greater than half of the largest transverse dimension of the channel
  • each other arc of a circle has a radius of a dimension greater than the radius of the arc of a circle previous and lower than the radius of the next arc.
  • each arc is tangent to the previous arc.
  • the slot 106 has a height H 106 of about 0.55 mm and a width l 106 of about 0.12 mm.
  • the height H 106 is considered in the direction defined by the intersection of the plane P 106 with the plane of the figure 4 and the width l 106 is measured in the plane of the figure 4 and perpendicular to the plane P 106 .
  • the height H 106 may be between 0.2 mm and 2 mm and the width l 106 may be between 0.02 mm and 1.60 mm.
  • the surfaces 161 and 162 form between them an angle ⁇ of about 30 °. In practice, the angle ⁇ can be between 10 ° and 110 °.
  • the channel 104 has a length L 104 , taken along the axis X 101 -X ' 101 , of approximately 1.1 mm.
  • the length L 104 may be between 0.4 mm and 3.5 mm.
  • the diameter D 104 of the channel 104 is approximately 0.55 mm and can in practice be between 0.1 mm and 1.8 mm.
  • the intersection of the dome 105, "flattened” or “short", with the planar surfaces 161 and 162 which form the slot 106 defines an outlet orifice 107 of substantially rectangular shape with rounded corners.
  • the orifice 107 has, in the front view of the figure 4 , a quadrant symmetry whose center is at the intersection of the plane P 106 , the axis X 101 -X ' 101 and the plane of the figure 4 .
  • Such a nozzle makes it possible to reduce considerably the "horn effect", thus of standardize the flow of liquid in the spray jet for example at 70 bar, or even under lower pressure, for example 40 bar. Insofar as this spray is more uniform, the quality of the spray and therefore the application of this jet, for example the coating of an object, is substantially improved.
  • the "horn effect" is reduced, the wear of the edges of the outlet orifice 107 of a nozzle 101 according to the invention is greatly reduced, which increases the life of the nozzle 101.
  • a nozzle 201, a longitudinal axis X 201 -X ' 201 , a body 202, a channel 204 of diameter D 204 and radius R 204 , a dome 205 of length L 205 , a slot 206 with an outlet orifice are thus defined.
  • the nozzle 201 differs from the nozzle 101 because the flat section of the dome 205 is defined by three circular arcs C 2051 , C 2052 and C 2053 , instead of two for the dome 105. Like the flat section of the figure 5 , the flat section of the figure 7 is symmetrical with respect to the longitudinal axis X 201 -X ' 201 .
  • three arcs C ' 2051 , C' 2052 and C ' 2053 extend between the downstream end portion 2041 of the channel 204 and the axis X 201 -X' 201 , respectively symmetrically to the arcs C 2051 , C 2052 and C 2053 by relative to the X axis 201 -X ' 201 .
  • the radius R 2053 is greater than the radius R 2052 , which itself is greater than the radius R 2051 .
  • the radius R 2051 is smaller than the radius R 204 of the channel 204 and the radius R 2053 is greater than the radius R 204 .
  • the geometry and the dimensions of the nozzle 201, in particular of its dome 205, make it possible to further reduce the effect of "horns", thus to further standardize the flow of liquid in the spray jet, with respect to the nozzle 101 .
  • the figure 8 illustrates a sprayer 100 of liquid, in particular high-pressure coating liquid, comprising a nozzle 101 according to the invention.
  • the sprayer 100 thus produces a spray of improved quality and relatively uniform.
  • the sprayer 100 requires less intervention for the replacement of the nozzle 101.
  • the nozzle 101 can be made of a material of high hardness, which can be selected from the group consisting of tungsten carbides and ceramics or any other material of high hardness.
  • High hardness means a hardness greater than 50 on the Rockwell C scale.

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Abstract

The nozzle (101) has a tubular channel (104) canalizing a liquid and extending along a longitudinal axis (X101-X'101). A slot (106) conforms a jet of liquid issued from the channel and has a plane surface (161) convergent in a direction of the channel. A dome (105) connects the channel and the slot and has a plane section symmetrical relative to the longitudinal axis. The section is defined by two arcs of circle extending between a downstream terminal part of the channel and the longitudinal axis, where the arcs have different radii and centers located at a side of the channel. The nozzle is made of a material selected in a group comprising tungsten carbide and ceramics.

Description

La présente invention concerne une buse de pulvérisation de liquide, en particulier de liquide de revêtement sous haute pression. Par ailleurs, l'invention concerne un pulvérisateur de liquide, en particulier de liquide de revêtement sous haute pression, comprenant une telle buse.The present invention relates to a liquid spray nozzle, in particular high pressure coating liquid. In addition, the invention relates to a liquid sprayer, in particular a high-pressure coating liquid, comprising such a nozzle.

Un pulvérisateur de liquide, de type manuel ou de type automatique, comprend généralement une buse de pulvérisation, parfois plusieurs, qui est (sont) montée(s) au niveau de l'extrémité aval du pulvérisateur. Les termes « amont » et « aval » sont employés ici par référence au sens d'écoulement du liquide dans le pulvérisateur. Le terme « amont » désigne des éléments situés du côté du pulvérisateur où arrive le liquide à pulvériser depuis une source d'alimentation. Le terme « aval » désigne des éléments situés du côté du pulvérisateur où le liquide est pulvérisé en gouttelettes.A liquid sprayer, either manual or automatic type, generally comprises a spray nozzle, sometimes several, which is (are) mounted at the downstream end of the sprayer. The terms "upstream" and "downstream" are used herein with reference to the flow direction of the liquid in the sprayer. The term "upstream" refers to elements on the side of the sprayer where the liquid to be sprayed from a power source arrives. The term "downstream" refers to elements on the side of the sprayer where the liquid is sprayed into droplets.

Un tel pulvérisateur peut être par exemple destiné à pulvériser des liquides de revêtement, tel que des peintures de type hydrosoluble ou de type solvanté. Pour réaliser la pulvérisation du liquide en gouttelettes, le pulvérisateur est relié, par l'intermédiaire d'un ou plusieurs tuyau(x), à une pompe destinée à mettre le liquide sous haute pression, par exemple sous 70 bars. La pulvérisation est réalisée au niveau de l'extrémité aval de la buse, laquelle présente une géométrie déterminée en fonction de la forme voulue pour le jet des gouttelettes du liquide pulvérisé.Such a spray can be for example intended to spray coating liquids, such as water-soluble or solvent type paints. To spray the liquid into droplets, the sprayer is connected, via one or more pipes (x), to a pump for putting the liquid under high pressure, for example under 70 bar. Spraying is carried out at the downstream end of the nozzle, which has a geometry determined according to the desired shape for the jet of the droplets of the sprayed liquid.

Dans le but de conformer le jet de liquide pulvérisé en « éventail », jet usuellement qualifié de « plat », on connaît de l'art antérieur une buse telle que celle illustrée par les figures 1 et 2. Comme le montre la figure 1, la buse 1 comprend un corps 2 qui définit, côté amont, une chambre 3 par où arrive le liquide et, côté aval, un canal 4 pour amener le liquide depuis la chambre 3 jusqu'en sortie de la buse 1. La chambre 3 et le canal 4 s'étendent le long d'un axe longitudinal X1-X'1 de la buse 1. En aval du canal 4, la buse 1 comprend une fente 6 destinée à conformer le jet de liquide en un jet plat. Comme le montrent les figures 1 et 2, la fente 6 est formée par deux surfaces 61 et 62 qui sont planes, qui convergent en direction du canal 4 et qui sont disposées de part et d'autre d'un plan P6 comprenant l'axe X1-X'1. Le fond borgne du canal 4 obtenu dans le corps 2, avant fraisage de la fente 6, présente la forme d'un dôme 5 creux, que l'on désigne ici par le mot « dôme ». Le dôme 5 relie le canal 4 et la fente 6.In order to conform the jet of sprayed liquid to a "fan", usually referred to as a "flat" jet, there is known from the prior art a nozzle such as that illustrated by FIGS. Figures 1 and 2 . As shown in figure 1 the nozzle 1 comprises a body 2 which defines, on the upstream side, a chamber 3 through which the liquid arrives and, downstream side, a channel 4 for bringing the liquid from the chamber 3 to the outlet of the nozzle 1. The chamber 3 and the channel 4 extend along a longitudinal axis X 1 -X ' 1 of the nozzle 1. Downstream of the channel 4, the nozzle 1 comprises a slot 6 intended to form the jet of liquid in a flat jet. As shown by Figures 1 and 2 , the slot 6 is formed by two surfaces 61 and 62 which are flat, which converge towards the channel 4 and which are disposed on either side of a plane P 6 comprising the axis X 1 -X ' 1 . The blind bottom of the channel 4 obtained in the body 2, before milling the slot 6, has the shape of a hollow dome 5, which is designated here by the word "dome". The dome 5 connects the channel 4 and the slot 6.

Dans les buses de l'art antérieur, le dôme 5 présente une forme d'ogive ou une forme hémisphérique, dont la longueur est de l'ordre du diamètre du canal 4. Comme le montre la figure 2, l'intersection du dôme 5 avec les surfaces 61 et 62 de la fente 6 définit un orifice de sortie 7 de la buse 1 globalement en forme d'ellipse aplatie.In the nozzles of the prior art, the dome 5 has an ogival shape or a hemispherical shape, whose length is of the order of the diameter of the channel 4. As shown in FIG. figure 2 , the intersection of the dome 5 with the surfaces 61 and 62 of the slot 6 defines an outlet orifice 7 of the nozzle 1 generally elliptical flattened.

Lorsque la buse 1 pulvérise un liquide sous haute pression, par exemple sous 70 bars, la géométrie de l'orifice 7 conforme le jet en un cône à section elliptique. Avec la buse 1, le débit de liquide pulvérisé n'est pas réparti uniformément dans cette section elliptique. Il présente au contraire des concentrations supérieures vers les bords éloignés de l'ellipse. Dans le domaine de la pulvérisation de liquide de revêtement, une telle répartition du liquide est appelée « effet de cornes ». On a constaté que plus les bords éloignés de l'ellipse sont arrondis, plus les « cornes » sont importantes dans le débit de liquide.When the nozzle 1 sprays a liquid under high pressure, for example under 70 bar, the geometry of the orifice 7 conforms the jet into an elliptical section cone. With the nozzle 1, the flow of sprayed liquid is not evenly distributed in this elliptical section. On the contrary, it has higher concentrations towards the far edges of the ellipse. In the field of spraying coating liquid, such a distribution of the liquid is called "horn effect". It has been found that the farther the edges of the ellipse are rounded, the greater the "horns" are important in the flow of liquid.

« L'effet de cornes » présente l'inconvénient d'engendrer une usure dissymétrique de la buse 1, en creusant davantage les bords de l'orifice 7. Cette usure est d'autant plus importante que le liquide pulvérisé est abrasif. Cette usure augmente « l'effet de cornes » et entraîne donc une détérioration de la qualité de la pulvérisation. De plus, elle réduit la durée de vie de la buse 1, y compris lorsque le matériau composant le corps 2 présente une dureté élevée."The effect of horns" has the disadvantage of generating asymmetrical wear of the nozzle 1, by further digging the edges of the orifice 7. This wear is all the more important that the sprayed liquid is abrasive. This wear increases the "horn effect" and therefore causes a deterioration in the quality of the spray. In addition, it reduces the life of the nozzle 1, including when the material of the body 2 has a high hardness.

GB-A-1 312 052 décrit une buse à jet plat comprenant une discontinuité à la jonction entre le canal et le dôme reliant le canal et la fente de la buse. Cependant, une buse selon GB-A-1 312 052 ne permet pas de réduire significativement l'effet de « cornes » pour obtenir une qualité de pulvérisation satisfaisante. GB-A-1,312,052 discloses a flat jet nozzle comprising a discontinuity at the junction between the channel and the dome connecting the channel and the slot of the nozzle. However, a nozzle according to GB-A-1,312,052 does not significantly reduce the effect of "horns" to obtain a satisfactory spray quality.

La présente invention vise notamment à remédier à ces inconvénients, en proposant une buse de pulvérisation de durée de vie supérieure et permettant de réaliser un jet plat avec une répartition du liquide relativement uniforme, donc d'améliorer la qualité de pulvérisation.The present invention aims in particular to remedy these drawbacks, by proposing a spray nozzle of lifetime superior and making it possible to achieve a flat jet with a relatively uniform distribution of the liquid, thus improving the quality of spraying.

A cet effet, l'invention a pour objet une buse de pulvérisation de liquide, en particulier de liquide de revêtement sous haute pression, comprenant :

  • un canal tubulaire pour canaliser le liquide, ledit canal s'étendant selon un axe longitudinal ;
  • une fente pour conformer un jet de liquide issu du canal, ladite fente étant formée par deux surfaces sensiblement planes, lesdites surfaces convergeant en direction du canal et étant disposées de part et d'autre d'un plan comprenant l'axe longitudinal du canal ; et
  • un dôme reliant le canal et la fente,
For this purpose, the subject of the invention is a liquid spray nozzle, in particular a high-pressure coating liquid, comprising:
  • a tubular channel for channeling the liquid, said channel extending along a longitudinal axis;
  • a slot for forming a jet of liquid from the channel, said slot being formed by two substantially planar surfaces, said surfaces converging towards the channel and being disposed on either side of a plane comprising the longitudinal axis of the channel; and
  • a dome connecting the canal and the slot,

La longueur du dôme, prise parallèlement à l'axe longitudinal, représente moins de 50%, de préférence entre 20% et 45%, de la plus grande dimension transversale du canal, prise dans un plan orthogonal à l'axe longitudinal.The length of the dome, taken parallel to the longitudinal axis, represents less than 50%, preferably between 20% and 45%, of the largest transverse dimension of the channel, taken in a plane orthogonal to the longitudinal axis.

Cette buse se caractérise en ce que le dôme a une section plane symétrique par rapport à l'axe longitudinal, ladite section plane étant définie par au moins deux arcs de cercles qui s'étendent entre une partie terminale aval du canal et l'axe longitudinal et qui ont des rayons différents et des centres situés du côté du canal.This nozzle is characterized in that the dome has a symmetrical flat section with respect to the longitudinal axis, said flat section being defined by at least two arcs of circles which extend between a downstream end portion of the channel and the longitudinal axis and have different radii and centers on the canal side.

Selon d'autres caractéristiques avantageuses mais facultatives de l'invention, prise isolément ou selon toute combinaison techniquement admissible :

  • la section plane est définie par trois arcs de cercles qui s'étendent entre une partie terminale aval du canal et l'axe longitudinal et qui ont des rayons différents et des centres situés du côté du canal ;
  • un premier arc de cercle proche de la partie terminale aval du canal a un rayon inférieur à la moitié de la plus petite dimension du canal, prise dans un plan orthogonal à l'axe longitudinal, l'arc de cercle le plus éloigné de la partie terminale aval du canal ayant un rayon supérieur à la moitié de la plus grande dimension du canal, prise dans un plan orthogonal à l'axe longitudinal, et chaque autre arc de cercle ayant un rayon d'une dimension supérieure au rayon de l'arc de cercle précédent et inférieure au rayon de l'arc de cercle suivant ;
  • ledit premier arc de cercle est tangent à la partie terminale aval du canal et chaque autre arc de cercle est tangent à l'arc de cercle précédent ;
  • le canal a une forme cylindrique à base circulaire le dôme est à symétrie de révolution autour de l'axe longitudinal du canal ;
  • les dimensions du canal, prises dans un plan orthogonal à l'axe longitudinal, sont comprises entre 0,1 mm et 1,8 mm ;
  • la fente a une hauteur comprise entre 0,2 mm et 2 mm et une largeur (ℓ106) comprise entre 0,02 mm et 1,60 mm.
  • lesdites surfaces forment entre elles un angle compris entre 10° et 110°,
  • la buse est réalisée en un matériau ayant une dureté supérieure à 50 sur l'échelle Rockwell C, ce matériau pouvant être sélectionné dans le groupe comprenant les carbures de tungstène et les céramiques.
According to other advantageous but optional features of the invention, taken in isolation or in any technically permissible combination:
  • the planar section is defined by three arcs of circles which extend between a downstream end portion of the channel and the longitudinal axis and which have different radii and centers located on the channel side;
  • a first arc close to the downstream end portion of the channel has a radius less than half of the smallest dimension of the channel, taken in a plane orthogonal to the longitudinal axis, the arc furthest from the part downstream end of the channel having a radius greater than half the largest dimension of the channel, taken in an orthogonal plane to the longitudinal axis, and each other circular arc having a radius of a dimension greater than the radius of the preceding arc and less than the radius of the next arc;
  • said first arc is tangential to the downstream end portion of the channel and each other arc of a circle is tangent to the preceding arc;
  • the channel has a cylindrical shape with a circular base; the dome is symmetrical in revolution around the longitudinal axis of the channel;
  • the dimensions of the channel, taken in a plane orthogonal to the longitudinal axis, are between 0.1 mm and 1.8 mm;
  • the slot has a height of between 0.2 mm and 2 mm and a width (ℓ 106 ) of between 0.02 mm and 1.60 mm.
  • said surfaces form between them an angle of between 10 ° and 110 °,
  • the nozzle is made of a material having a hardness greater than 50 on the Rockwell C scale, which material can be selected from the group consisting of tungsten carbides and ceramics.

Par ailleurs, l'invention a pour objet un pulvérisateur de liquide, en particulier de liquide de revêtement sous haute pression, caractérisé en ce qu'il comprend une buse telle qu'exposée ci-dessus.Furthermore, the subject of the invention is a liquid atomizer, in particular a high-pressure coating liquid, characterized in that it comprises a nozzle as explained above.

L'invention sera bien comprise et ses avantages apparaîtront à la lumière de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif et faite en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une coupe d'une buse de l'art antérieur ;
  • la figure 2 est une vue de dessus partielle, à plus grande échelle, de la buse illustrée à la figure 1 ;
  • la figure 3 est une coupe analogue à la figure 1 d'une buse conforme à un premier mode de réalisation de l'invention ;
  • la figure 4 est une vue analogue à la figure 2 de la buse illustrée à la figure 3 ;
  • la figure 5 est une coupe partielle, à plus grande échelle, selon la ligne V-V à la figure 4 ;
  • la figure 6 est une vue analogue à la figure 4 d'une buse conforme à un deuxième mode de réalisation de l'invention ;
  • la figure 7 est une vue analogue à la figure 5 de la buse partiellement illustrée à la figure 6 ; et
  • la figure 8 est une vue en perspective d'un pulvérisateur conforme à l'invention comprenant une buse conforme à l'invention.
The invention will be well understood and its advantages will become apparent in the light of the description which follows, given solely by way of nonlimiting example and with reference to the appended drawings, in which:
  • the figure 1 is a section of a nozzle of the prior art;
  • the figure 2 is a partial top view, on a larger scale, of the nozzle illustrated in FIG. figure 1 ;
  • the figure 3 is a cut similar to the figure 1 a nozzle according to a first embodiment of the invention;
  • the figure 4 is a view similar to the figure 2 of the nozzle shown in the figure 3 ;
  • the figure 5 is a partial section, on a larger scale, according to line VV to figure 4 ;
  • the figure 6 is a view similar to the figure 4 a nozzle according to a second embodiment of the invention;
  • the figure 7 is a view similar to the figure 5 of the nozzle partially illustrated at the figure 6 ; and
  • the figure 8 is a perspective view of a sprayer according to the invention comprising a nozzle according to the invention.

Comme le montre la figure 3, la buse 101 comprend un corps 102 qui définit, côté amont, une chambre 103 par où arrive le liquide et, côté aval, un canal 104 pour amener le liquide depuis la chambre 103 jusqu'en sortie de la buse 101. Le sens d'écoulement de fluide à travers la buse 101 est représenté par une flèche F, qui permet ainsi de repérer les côtés amont et aval de la buse 101.As shown in figure 3 the nozzle 101 comprises a body 102 which defines, on the upstream side, a chamber 103 through which the liquid arrives and, on the downstream side, a channel 104 for bringing the liquid from the chamber 103 to the outlet of the nozzle 101. The meaning of flow of fluid through the nozzle 101 is represented by an arrow F, which thus identifies the upstream and downstream sides of the nozzle 101.

La chambre 103 et le canal 104 s'étendent le long d'un axe longitudinal X101-X'101 de la buse 101. Dans l'exemple de la figure 3, le canal 104 est globalement en forme de cylindre d'axe X101-X'101 et à base circulaire de diamètre D104. En aval du canal 104, la buse 101 comprend une fente 106 destinée à conformer le jet de liquide en un jet plat. Comme le montrent les figures 3 et 4, la fente 106 est formée par deux surfaces 161 et 162 qui sont planes, qui convergent en direction du canal 104 et qui sont disposées de part et d'autre d'un plan P106 comprenant l'axe X101-X'101.The chamber 103 and the channel 104 extend along a longitudinal axis X 101 -X ' 101 of the nozzle 101. In the example of the figure 3 the channel 104 is generally in the form of a cylinder of axis X 101 -X ' 101 and circular base of diameter D 104 . Downstream of the channel 104, the nozzle 101 includes a slot 106 for shaping the jet of liquid into a flat stream. As shown by Figures 3 and 4 , the slot 106 is formed by two surfaces 161 and 162 which are flat, which converge towards the channel 104 and which are disposed on either side of a plane P 106 comprising the axis X 101 -X ' 101 .

La buse 101 comprend en outre un dôme 105 reliant le canal 104 et la fente 106. Par « dôme », on désigne le fond borgne du canal 104, qui est obtenu dans le corps 102 avant fraisage de la fente 106. Par « relier », on entend mettre en communication de fluide.The nozzle 101 further comprises a dome 105 connecting the channel 104 and the slot 106. The term "dome" designates the blind bottom of the channel 104, which is obtained in the body 102 before milling the slot 106. By "connecting" it is intended to put fluid into communication.

La longueur L105 du dôme 105, prise parallèlement à l'axe longitudinal X101-X'101, représente ici 25% du diamètre D104 du canal 104. En pratique, la longueur L105 du dôme 105 représente moins de 50% du diamètre D104 du canal 104, de préférence entre 20% et 45%. En d'autres termes, le dôme 105 présente une forme courte ou aplatie par rapport au dôme 5 de la buse 1 selon l'art antérieur illustré à la figure 1.The length L 105 of the dome 105, taken parallel to the longitudinal axis X 101 -X ' 101 , here represents 25% of the diameter D 104 of the channel 104. In practice, the length L 105 of the dome 105 represents less than 50% of the D 104 diameter of the channel 104, preferably between 20% and 45%. In other words, the dome 105 has a short or flattened shape with respect to the dome 5 of the nozzle 1 according to the prior art illustrated in FIG. figure 1 .

Le canal tubulaire de la buse objet de l'invention peut, en variante, avoir une forme prismatique ou une forme cylindrique à base non circulaire, par exemple à base elliptique. Dans ce cas aussi, la longueur du dôme est inférieure à 50%, de préférence comprise entre 20% et 45%, de la plus grande dimension transversale du canal, prise dans un plan orthogonal à l'axe longitudinal de la buse.The tubular channel of the nozzle object of the invention may, in a variant, have a prismatic shape or a cylindrical shape with a non-circular base, for example an elliptical base. In this case too, the length of the dome is less than 50%, preferably between 20% and 45%, of the largest transverse dimension of the channel, taken in a plane orthogonal to the longitudinal axis of the nozzle.

Le dôme 105 présente une symétrie de révolution autour de l'axe X101-X'101. Une section du dôme 105 par un plan contenant l'axe X101-X'101, par exemple par le plan P106, est définie par deux arcs de cercles C1051 et C1052 qui s'étendent entre une partie terminale aval 1041 du canal 104 et l'axe X101-X'101. Les arcs de cercles C1051 et C1052 ont des rayons respectifs R1051 et R1052 différents et des centres respectifs O1051 et O1052 situés du côté du canal 104, c'est-à-dire à l'opposé de la partie aval de la fente 106.The dome 105 has a symmetry of revolution about the axis X 101 -X ' 101 . A section of the dome 105 by a plane containing the axis X 101 -X ' 101 , for example by the plane P 106 , is defined by two arcs of circles C 1051 and C 1052 which extend between a downstream end portion 1041 of the channel 104 and the X axis 101 -X ' 101 . The arcs of circles C 1051 and C 1052 have respective radii R 1051 and R 1052 and respective centers O 1051 and O 1052 located on the side of channel 104, that is to say opposite the downstream part. of the slot 106.

Sur la partie droite de la figure 5, les deux arcs C'1051 et C'1052 s'étendent entre la partie terminale 1041 du canal 104 et l'axe X101-X'101, symétriquement aux arcs C1051 et C1052 par rapport à l'axe X101-X'101. Le rayon R1051 est relativement petit devant le rayon R1052. Ainsi, le rayon R1051 est inférieur à la moitié du diamètre D104, lequel représente à la fois la plus petite et la plus grande dimension transversale du canal 104. Par « transversale » on désigne une dimension prise dans un plan orthogonal à l'axe longitudinal X101-X'101. Inversement, le rayon R1052 est supérieur à la moitié du diamètre D104 du canal 104.On the right side of the figure 5 , the two arcs C ' 1051 and C' 1052 extend between the end portion 1041 of the channel 104 and the axis X 101 -X ' 101 , symmetrically with the arcs C 1051 and C 1052 with respect to the axis X 101 - X ' 101 . The radius R 1051 is relatively small in front of the radius R 1052 . Thus, the radius R 1051 is less than half the diameter D 104 , which represents both the smallest and the largest transverse dimension of the channel 104. By "transverse" is meant a dimension taken in a plane orthogonal to the longitudinal axis X 101 -X ' 101 . Conversely, the radius R 1052 is greater than half the diameter D 104 of the channel 104.

De plus, l'arc de cercle C1051 est tangent à la partie terminale 1041 du canal 104 et l'arc de cercle C1052 est tangent à l'arc de cercle C1051. Ainsi, les arcs C1051 et C1052 sont raccordés de façon continue et sans singularité. Par symétrie, la géométrie des arcs C'1051 et C'1052 est identique à celle des arcs C1051 et C1052. Le dôme 105 présente ainsi une forme globalement trapézoïdale ou une forme de demi lentille convergente.In addition, the circular arc C 1051 is tangent to the end portion 1041 of the channel 104 and the circular arc C 1052 is tangent to the circular arc C 1051 . Thus, the arcs C 1051 and C 1052 are connected continuously and without singularity. By symmetry, the geometry of arches C ' 1051 and C' 1052 is identical to that of arcs C 1051 and C 1052 . The dome 105 thus has a generally trapezoidal shape or a convergent half-lens shape.

La forme du dôme 105 pourrait être composée de plus de deux arcs de cercles raccordés entre eux. Dans ce cas, le rayon de l'arc de cercle le plus proche de la partie terminale aval du canal est inférieur à la moitié de la plus grande dimension transversale du canal, le rayon de l'arc de cercle le plus éloigné de la partie terminale du canal est supérieur à la moitié de la plus grande dimension transversale du canal, et chaque autre arc de cercle a un rayon d'une dimension supérieure au rayon de l'arc de cercle précédent et inférieure au rayon de l'arc de cercle suivant. De plus, dans ce cas, chaque arc de cercle est tangent à l'arc de cercle précédent.The shape of the dome 105 could be composed of more than two arcs of circles connected to each other. In this case, the radius of the arc closest to the downstream end of the channel is less than half of the largest transverse dimension of the channel, the radius of the arc farthest from the part end of the channel is greater than half of the largest transverse dimension of the channel, and each other arc of a circle has a radius of a dimension greater than the radius of the arc of a circle previous and lower than the radius of the next arc. In addition, in this case, each arc is tangent to the previous arc.

Dans l'exemple des figures 3 à 5, la fente 106 présente une hauteur H106 d'environ 0,55 mm et une largeur ℓ106 d'environ 0,12 mm. La hauteur H106 est considérée selon la direction définie par l'intersection du plan P106 avec le plan de la figure 4 et la largeur ℓ106 est mesurée dans le plan de la figure 4 et perpendiculairement au plan P106. En pratique, la hauteur H106 peut être comprise entre 0,2 mm et 2 mm et la largeur ℓ106 peut être comprise entre 0,02 mm et 1,60 mm. Comme le montre la figure 5, les surfaces 161 et 162 forment entre elles un angle α d'environ 30°. En pratique, l'angle α peut être compris entre 10° et 110°.In the example of Figures 3 to 5 the slot 106 has a height H 106 of about 0.55 mm and a width ℓ 106 of about 0.12 mm. The height H 106 is considered in the direction defined by the intersection of the plane P 106 with the plane of the figure 4 and the width ℓ 106 is measured in the plane of the figure 4 and perpendicular to the plane P 106 . In practice, the height H 106 may be between 0.2 mm and 2 mm and the width ℓ 106 may be between 0.02 mm and 1.60 mm. As shown in figure 5 , the surfaces 161 and 162 form between them an angle α of about 30 °. In practice, the angle α can be between 10 ° and 110 °.

Le canal 104 présente une longueur L104, prise selon l'axe X101-X'101, d'environ 1,1 mm. En pratique, la longueur L104 peut être comprise entre 0,4 mm et 3,5 mm. Par ailleurs, le diamètre D104 du canal 104 vaut environ 0,55 mm et il peut être en pratique compris entre 0,1 mm et 1,8 mm.The channel 104 has a length L 104 , taken along the axis X 101 -X ' 101 , of approximately 1.1 mm. In practice, the length L 104 may be between 0.4 mm and 3.5 mm. On the other hand, the diameter D 104 of the channel 104 is approximately 0.55 mm and can in practice be between 0.1 mm and 1.8 mm.

Comme le montre la figure 4, l'intersection du dôme 105, « aplati » ou « court », avec les surfaces planes 161 et 162 qui forment la fente 106 définit un orifice de sortie 107 de forme sensiblement rectangulaire avec des coins arrondis. Dans la mesure où les surfaces 161 et 162 sont symétriques par rapport au plan P106 et où le dôme 105 présente une symétrie d'axe X101-X'101, l'orifice 107 présente, dans la vue de face de la figure 4, une symétrie par quadrants, dont le centre est à l'intersection du plan P106, de l'axe X101-X'101 et du plan de la figure 4.As shown in figure 4 the intersection of the dome 105, "flattened" or "short", with the planar surfaces 161 and 162 which form the slot 106 defines an outlet orifice 107 of substantially rectangular shape with rounded corners. Insofar as the surfaces 161 and 162 are symmetrical with respect to the plane P 106 and where the dome 105 has a symmetry of axis X 101 -X ' 101 , the orifice 107 has, in the front view of the figure 4 , a quadrant symmetry whose center is at the intersection of the plane P 106 , the axis X 101 -X ' 101 and the plane of the figure 4 .

La géométrie et les dimensions de la buse 101, en particulier de son dôme 105 aplati, permettent de définir la forme sensiblement rectangulaire de l'orifice de sortie 107. Une telle buse permet de réduire considérablement « l'effet de cornes », donc d'uniformiser le débit de liquide dans le jet pulvérisé par exemple sous 70 bars, ou même sous pression inférieure, par exemple 40 bars. Dans la mesure où ce jet pulvérisé est plus uniforme, la qualité de la pulvérisation donc de l'application de ce jet, par exemple le revêtement d'un objet, est sensiblement améliorée. De plus, comme « l'effet de cornes » est réduit, l'usure des bords de l'orifice de sortie 107 d'une buse 101 conforme à l'invention se trouve fortement réduite, ce qui augmente la durée de vie de la buse 101.The geometry and the dimensions of the nozzle 101, in particular of its flattened dome 105, make it possible to define the substantially rectangular shape of the outlet orifice 107. Such a nozzle makes it possible to reduce considerably the "horn effect", thus of standardize the flow of liquid in the spray jet for example at 70 bar, or even under lower pressure, for example 40 bar. Insofar as this spray is more uniform, the quality of the spray and therefore the application of this jet, for example the coating of an object, is substantially improved. In addition, since the "horn effect" is reduced, the wear of the edges of the outlet orifice 107 of a nozzle 101 according to the invention is greatly reduced, which increases the life of the nozzle 101.

La description des figures 4 et 5 donnée ci-dessus peut être directement transposée aux figures 6 et 7, mis à part les différences mentionnées ci-après. Un élément de la figure 6 ou 7 semblable ou correspondant à un élément de la figure 4 ou 5 porte la même référence numérique avec le préfixe 2 remplaçant le préfixe 1.The description of figures 4 and 5 given above can be directly transposed to the Figures 6 and 7 , apart from the differences mentioned below. An element of the figure 6 or 7 similar or corresponding to an element of the figure 4 or 5 carries the same numerical reference with the prefix 2 replacing the prefix 1.

On définit ainsi une buse 201, un axe longitudinal X201-X'201, un corps 202, un canal 204 de diamètre D204 et de rayon R204, un dôme 205 de longueur L205, une fente 206 avec un orifice de sortie 207, des arcs de cercle C2051 et C2052 de rayons respectifs R2051 et R2052 et de centres respectifs O2051 et O2052, ainsi qu'une partie terminale aval 2041.A nozzle 201, a longitudinal axis X 201 -X ' 201 , a body 202, a channel 204 of diameter D 204 and radius R 204 , a dome 205 of length L 205 , a slot 206 with an outlet orifice are thus defined. 207, C 2051 and C 2052 circular arcs of respective radii R 2051 and R 2052 and respective centers O 2051 and O 2052 , as well as a downstream end portion 2041.

La buse 201 diffère de la buse 101, car la section plane du dôme 205 est définie par trois arcs de cercle C2051, C2052 et C2053, au lieu de deux pour le dôme 105. A l'instar la section plane de la figure 5, la section plane de la figure 7 est symétrique par rapport à l'axe longitudinal X201-X'201. Ainsi, sur la partie droite de la figure 7, trois arcs C'2051, C'2052 et C'2053 s'étendent entre la partie terminale aval 2041 du canal 204 et l'axe X201-X'201, respectivement symétriquement aux arcs C2051, C2052 et C2053 par rapport à l'axe X201-X'201.The nozzle 201 differs from the nozzle 101 because the flat section of the dome 205 is defined by three circular arcs C 2051 , C 2052 and C 2053 , instead of two for the dome 105. Like the flat section of the figure 5 , the flat section of the figure 7 is symmetrical with respect to the longitudinal axis X 201 -X ' 201 . So, on the right side of the figure 7 , three arcs C ' 2051 , C' 2052 and C ' 2053 extend between the downstream end portion 2041 of the channel 204 and the axis X 201 -X' 201 , respectively symmetrically to the arcs C 2051 , C 2052 and C 2053 by relative to the X axis 201 -X ' 201 .

Le rayon R2053 est supérieur au rayon R2052, lequel est lui-même supérieur au rayon R2051. De plus, le rayon R2051 est inférieur au rayon R204 du canal 204 et le rayon R2053 est supérieur au rayon R204.The radius R 2053 is greater than the radius R 2052 , which itself is greater than the radius R 2051 . In addition, the radius R 2051 is smaller than the radius R 204 of the channel 204 and the radius R 2053 is greater than the radius R 204 .

La géométrie et les dimensions de la buse 201, en particulier de son dôme 205, permettent de réduire encore davantage l'effet de « cornes », donc d'uniformiser davantage le débit de liquide dans le jet pulvérisé, par rapport à la buse 101.The geometry and the dimensions of the nozzle 201, in particular of its dome 205, make it possible to further reduce the effect of "horns", thus to further standardize the flow of liquid in the spray jet, with respect to the nozzle 101 .

La figure 8 illustre un pulvérisateur 100 de liquide, en particulier de liquide de revêtement sous haute pression, comprenant une buse 101 conforme à l'invention. Le pulvérisateur 100 réalise donc une pulvérisation de qualité améliorée et relativement uniforme. De plus, le pulvérisateur 100 nécessite moins d'interventions pour le remplacement de la buse 101.The figure 8 illustrates a sprayer 100 of liquid, in particular high-pressure coating liquid, comprising a nozzle 101 according to the invention. The sprayer 100 thus produces a spray of improved quality and relatively uniform. In addition, the sprayer 100 requires less intervention for the replacement of the nozzle 101.

Dans le but d'augmenter encore la durée de vie de la buse 101, celle-ci peut être réalisée en un matériau de dureté élevée, lequel peut être sélectionné dans le groupe comprenant les carbures de tungstène et les céramiques ou tout autre matériau de dureté élevée. Par dureté élevée, on entend une dureté supérieure à 50 sur l'échelle Rockwell C.In order to further increase the life of the nozzle 101, it can be made of a material of high hardness, which can be selected from the group consisting of tungsten carbides and ceramics or any other material of high hardness. High hardness means a hardness greater than 50 on the Rockwell C scale.

Claims (10)

Buse de pulvérisation (101 ; 201) de liquide, en particulier de liquide de revêtement sous haute pression, comprenant : - un canal (104 ; 204) tubulaire pour canaliser le liquide, ledit canal (104 ; 204) s'étendant selon un axe longitudinal (X101-X'101 ; X201-X'201) ; - une fente (106 ; 206) pour conformer un jet de liquide issu du canal (104 ; 204), ladite fente (106 ; 206) étant formée par deux surfaces (161, 162) sensiblement planes, lesdites surfaces (161, 162) convergeant en direction du canal (104 ; 204) et étant disposées de part et d'autre d'un plan (P106) comprenant l'axe longitudinal (X101-X'101 ; X201-X'201) du canal (104 ; 204) ; et - un dôme (105 ; 205) reliant le canal (104 ; 204) et la fente (106 ; 206), la longueur (L105 ; L205) du dôme (105 ; 205), prise parallèlement à l'axe longitudinal (X101-X'101 ; X201-X'201), représentant moins de 50%, de préférence entre 20% et 45%, de la plus grande dimension transversale (D104 ; D204) du canal (104 ; 204), prise dans un plan orthogonal à l'axe longitudinal (X101-X'101 ; X201-X'201),
la buse (101 ; 201) étant caractérisée en ce que le dôme (105 ; 205) a une section plane symétrique par rapport à l'axe longitudinal (X101-X'101 ; X201-X'201), ladite section plane étant définie par au moins deux arcs de cercles (C1051, C1052, C'1051, C'1052 ; C2051, C2052, C2053, C'2051, C'2052, C'2053) qui s'étendent entre une partie terminale aval (1041 ; 2041) du canal (104 ; 204) et l'axe longitudinal (X101-X'101 ; X201-X'201) et qui ont des rayons (R1051, R1052 ; R2051, R2052, R2053) différents et des centres (O1051, O1052 ; O2051, O2052, O2053) situés du côté du canal (104 ; 204).Spray nozzle (101; 201) of liquid, particularly high pressure coating liquid, comprising: a tubular channel (104; 204) for channeling the liquid, said channel (104; 204) extending along a longitudinal axis (X 101 -X '101; X 201 -X' 201 ); - a slot (106; 206) for forming a jet of liquid from the channel (104; 204), said slot (106; 206) being formed by two substantially planar surfaces (161,162), said surfaces (161,162) converging towards the channel (104; 204) and being disposed on either side of a plane (P 106 ) comprising the longitudinal axis (X 101 -X '101; X 201 -X' 201 ) of the channel ( 104; 204); and a dome (105; 205) connecting the channel (104; 204) and the slot (106; 206); the length (L 105 , L 205 ) of the dome (105; 205), taken parallel to the longitudinal axis (X 101 -X '101; X 201 -X' 201 ), representing less than 50%, preferably between 20 % and 45%, of the largest transverse dimension (D 104 , D 204 ) of the channel (104; 204), taken in a plane orthogonal to the longitudinal axis (X 101 -X '101; X 201 -X' 201 )
the nozzle (101; 201) being characterized in that the dome (105; 205) has a plane section symmetrical about the longitudinal axis (X 101 -X '101; X 201 -X' 201 ), said planar section being defined by at least two circular arcs (C 1051 , C 1052 , C ' 1051 , C' 1052 , C 2051 , C 2052 , C 2053 , C ' 2051 , C' 2052 , C ' 2053 ) which extend between a downstream end portion (1041; 2041) of the channel (104; 204) and the longitudinal axis (X 101 -X '101; X 201 -X' 201 ) and which have radii (R 1051 , R 1052 ; R 2051 , R 2052 , R 2053 ) and centers (O 1051 , O 1052 ; O 2051 , O 2052 , O 2053 ) located on the channel (104; 204) side. Buse (201) selon la revendication 1, caractérisée en ce que ladite section plane est définie par trois arcs de cercles (C2051, C2052, C2053) qui s'étendent entre une partie terminale aval (2041) du canal (204) et l'axe longitudinal (X201-X'201) et qui ont des rayons (R2051, R2052, R2053) différents et des centres (O2051, O2052, O2053) situés du côté du canal (204).Nozzle (201) according to claim 1, characterized in that said plane section is defined by three arcs of circles (C 2051 , C 2052 , C 2053 ) which extend between a downstream end portion (2041) of the channel (204) and the longitudinal axis (X 201 -X ' 201 ) and having different radii (R 2051 , R 2052 , R 2053 ) and centers (O 2051 , O 2052 , O 2053 ) located on the channel (204) side . Buse (101 ; 201) selon la revendication 1 ou 2, caractérisée en ce qu'un premier arc de cercle (C1051, C'1051 ; C2051, C'2051) proche de la partie terminale aval (1041 ; 2041) du canal (104 ; 204) a un rayon (R1051 ; R2051) inférieur à la moitié de la plus petite dimension (D104 ; D204) du canal (104 ; 204), prise dans un plan orthogonal à l'axe longitudinal (X101-X'101 ; X201-X'201), et en ce que l'arc de cercle (C1052 , C'1052 ; C2053, C'2053) le plus éloigné de la partie terminale aval (1041 ; 2041) du canal (104 ; 204) a un rayon (R1052 ; R2053) supérieur à la moitié de la plus grande dimension (D104 ; D204) du canal (104 ; 204) prise dans un plan orthogonal à l'axe longitudinal (X101-X'101 ; X201-X'201), et en ce que chaque autre arc de cercle a un rayon d'une dimension supérieure au rayon de l'arc de cercle précédent (C1051, C'1051) et inférieure au rayon de l'arc de cercle suivant (C1052, C'1052).Nozzle (101; 201) according to claim 1 or 2, characterized in that a first arc (C 1051 , C ' 1051 , C 2051 , C' 2051 ) close to the downstream end portion (1041, 2041) of the channel (104; 204) has a radius (R 1051 ; R 2051 ) smaller than half the smallest dimension (D 104 ; D 204 ) of the channel (104; 204) taken in a plane orthogonal to the longitudinal axis (X 101 -X ' 101 , X 201 -X' 201 ), and in that the arc (C 1052 , C 1052 , C 2053 , C 2053 ) furthest from the downstream end portion (1041 2041) of the channel (104; 204) has a radius (R 1052 ; R 2053 ) greater than half the largest dimension (D 104 ; D 204 ) of the channel (104; 204) taken in a plane orthogonal to the longitudinal axis (X 101 -X '101; X 201 -X' 201 ), and in that each other arc of a circle has a radius of a dimension greater than the radius of the preceding arc (C 1051 , C 1051 ) and smaller than the radius of the next arc (C 1052 , C ' 1052 ). Buse (101) selon la revendication 3, caractérisée en ce que ledit premier arc de cercle (C1051, C'1051) est tangent à la partie terminale aval (1041) du canal (104) et en ce que chaque autre arc de cercle (C1052, C'1052) est tangent à l'arc de cercle précédent (C1051, C'1051).Nozzle (101) according to claim 3, characterized in that said first arc (C 1051 , C ' 1051 ) is tangent to the downstream end portion (1041) of the channel (104) and that each other arc of a circle (C 1052 , C ' 1052 ) is tangent to the preceding arc (C 1051 , C' 1051 ). Buse (101 ; 201) selon l'une des revendications précédentes, caractérisée en ce que le canal (104 ; 204) a une forme cylindrique à base circulaire et en ce que le dôme (105 ; 205) est à symétrie de révolution autour de l'axe longitudinal (X101-X'101 ; X201-X'201) du canal (104 ; 204).Nozzle (101; 201) according to one of the preceding claims, characterized in that the channel (104; 204) has a cylindrical shape with a circular base and in that the dome (105; 205) is symmetrical about the longitudinal axis (X 101 -X '101; X 201 -X' 201 ) of the channel (104; 204). Buse (101 ; 201) selon l'une des revendications précédentes, caractérisée en ce que les dimensions (D104 ; D204) du canal (104 ; 204), prises dans un plan orthogonal à l'axe longitudinal (X101-X'101 ; X201-X'201), sont comprises entre 0,1 mm et 1,8 mm.Nozzle (101; 201) according to one of the preceding claims, characterized in that the dimensions (D 104 , D 204 ) of the channel (104; 204), taken in a plane orthogonal to the longitudinal axis (X 101 -X '101; X 201 -X' 201 ) are between 0.1 mm and 1.8 mm. Buse (101) selon l'une des revendications précédentes, caractérisée en ce que la fente (106) a une hauteur (H106) comprise entre 0,2 mm et 2 mm et une largeur (ℓ106) comprise entre 0,02 mm et 1,60 mm.Nozzle (101) according to one of the preceding claims, characterized in that the slot (106) has a height (H 106 ) of between 0.2 mm and 2 mm and a width (ℓ 106 ) of between 0.02 mm and 1.60 mm. Buse (101) selon l'une des revendications précédentes, caractérisée en ce que lesdites surfaces (161, 162) forment entre elles un angle (α) compris entre 10°et 110°.Nozzle (101) according to one of the preceding claims, characterized in that said surfaces (161, 162) form between them an angle (α) of between 10 ° and 110 °. Buse (101 ; 201) selon l'une des revendications précédentes, caractérisée en ce qu'elle est réalisée en un matériau ayant une dureté supérieure à 50 sur l'échelle Rockwell C, ce matériau pouvant être sélectionné dans le groupe comprenant les carbures de tungstène et les céramiques.Nozzle (101; 201) according to one of the preceding claims, characterized in that it is made of a material having a hardness greater than 50 on the Rockwell C scale, which material can be selected from the group consisting of tungsten carbides and ceramics. Pulvérisateur (100) de liquide, en particulier de liquide de revêtement sous haute pression, caractérisé en ce qu'il comprend une buse (101 ; 201) selon l'une des revendications précédentes.Sprayer (100) of liquid, in particular high-pressure coating liquid, characterized in that it comprises a nozzle (101; 201) according to one of the preceding claims.
EP09155141A 2008-03-14 2009-03-13 Spray nozzle and liquid spraying device comprising said spray nozzle Not-in-force EP2100668B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0851673A FR2928567B1 (en) 2008-03-14 2008-03-14 LIQUID SPRAY NOZZLE AND LIQUID SPRAYER COMPRISING SUCH A NOZZLE

Publications (2)

Publication Number Publication Date
EP2100668A1 true EP2100668A1 (en) 2009-09-16
EP2100668B1 EP2100668B1 (en) 2012-10-31

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EP09155141A Not-in-force EP2100668B1 (en) 2008-03-14 2009-03-13 Spray nozzle and liquid spraying device comprising said spray nozzle

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US (1) US8590816B2 (en)
EP (1) EP2100668B1 (en)
ES (1) ES2396942T3 (en)
FR (1) FR2928567B1 (en)

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Also Published As

Publication number Publication date
FR2928567B1 (en) 2012-11-02
FR2928567A1 (en) 2009-09-18
US8590816B2 (en) 2013-11-26
ES2396942T3 (en) 2013-03-01
EP2100668B1 (en) 2012-10-31
US20090230221A1 (en) 2009-09-17

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