EP2100668A1 - Zerstäubungsdüse und Flüssigkeitszerstäuber - Google Patents

Zerstäubungsdüse und Flüssigkeitszerstäuber 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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English (en)
French (fr)
Other versions
EP2100668B1 (de
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
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Exel Industries SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Exel Industries SA filed Critical Exel Industries SA
Publication of EP2100668A1 publication Critical patent/EP2100668A1/de
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Publication of EP2100668B1 publication Critical patent/EP2100668B1/de
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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
    • 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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  • Nozzles (AREA)
EP09155141A 2008-03-14 2009-03-13 Zerstäubungsdüse und Flüssigkeitszerstäuber Expired - Fee Related EP2100668B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0851673A FR2928567B1 (fr) 2008-03-14 2008-03-14 Buse de pulverisation de liquide et pulverisateur de liquide comprenant une telle buse

Publications (2)

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

Family

ID=39944473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09155141A Expired - Fee Related EP2100668B1 (de) 2008-03-14 2009-03-13 Zerstäubungsdüse und Flüssigkeitszerstäuber

Country Status (4)

Country Link
US (1) US8590816B2 (de)
EP (1) EP2100668B1 (de)
ES (1) ES2396942T3 (de)
FR (1) FR2928567B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190076856A1 (en) * 2015-12-29 2019-03-14 Arcelormittal Air Nozzle for Guiding a Steel Strip at the Exit from a Device for Shearing a Steel Sheet

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8545937B2 (en) * 2009-08-31 2013-10-01 Nordson Corporation Spray coating with uniform flow distribution
US9592516B2 (en) * 2009-09-08 2017-03-14 Basf Se Polyurethane spraying system used to minimize emissions of a polyisocyanate
MX2010009775A (es) 2009-09-08 2011-06-15 Basf Se Metodo para minimizar las emisiones durante la formacion de una espuma de poliuretano.
RU2530406C1 (ru) * 2013-11-06 2014-10-10 Олег Савельевич Кочетов Форсунка
CN105081491A (zh) 2014-05-15 2015-11-25 通用电气公司 加工系统及用于其上的刀具固持装置
US10603611B2 (en) * 2014-05-30 2020-03-31 Daritech, Inc. Cleaning systems and methods for rotary screen separators
US10350617B1 (en) 2016-02-12 2019-07-16 Konstantin Dragan Composition of and nozzle for spraying a single-component polyurethane foam
US10702876B2 (en) 2016-06-03 2020-07-07 Konstantin Dragan System, composition, and method for dispensing a sprayable foamable product
US10815353B1 (en) 2016-06-03 2020-10-27 Konstantin Dragan Composition of and nozzle for spraying a single-component polyurethane foam
CN111279161A (zh) * 2017-11-02 2020-06-12 豪夫迈·罗氏有限公司 液滴分配装置及系统
US20210170426A1 (en) * 2019-12-09 2021-06-10 Graco Minnesota Inc. Tip piece for spray tip

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1312052A (en) 1969-04-16 1973-04-04 Ransburg Corp Atomising apparatus
US3754710A (en) * 1971-08-07 1973-08-28 Inouye Shokai & Co Ltd K K Nozzle tip of a spray gun of the airless type
EP1627689A1 (de) * 2004-08-13 2006-02-22 Imperial Chemical Industries Plc. Methode zum luftlosen Bespritzen einer wässrigen Beschichtungszusammensetzung hoher Viskosität
US20070069049A1 (en) * 2005-09-23 2007-03-29 Michael Lipthal Solid cone spray nozzle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659787A (en) * 1969-04-16 1972-05-02 Ransburg Electro Coating Corp Nozzle
JPH067937B2 (ja) * 1990-02-15 1994-02-02 アロイ工器株式会社 エアレス塗装用噴霧ノズル
DE4017594A1 (de) * 1990-05-31 1991-12-12 Wagner Int Flachstrahlduese
JP3494327B2 (ja) * 1995-10-03 2004-02-09 株式会社共立合金製作所 スケール除去用ノズル
DE19918257A1 (de) * 1999-04-22 2000-11-23 Lechler Gmbh & Co Kg Hochdrucksprühdüse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1312052A (en) 1969-04-16 1973-04-04 Ransburg Corp Atomising apparatus
US3754710A (en) * 1971-08-07 1973-08-28 Inouye Shokai & Co Ltd K K Nozzle tip of a spray gun of the airless type
EP1627689A1 (de) * 2004-08-13 2006-02-22 Imperial Chemical Industries Plc. Methode zum luftlosen Bespritzen einer wässrigen Beschichtungszusammensetzung hoher Viskosität
US20070069049A1 (en) * 2005-09-23 2007-03-29 Michael Lipthal Solid cone spray nozzle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190076856A1 (en) * 2015-12-29 2019-03-14 Arcelormittal Air Nozzle for Guiding a Steel Strip at the Exit from a Device for Shearing a Steel Sheet

Also Published As

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

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