EP3479906B1 - Buse de pulvérisation avec rétrécissement de pré-atomisation, et tête de pulvérisation et dispositif de pulvérisation comprenant une telle buse - Google Patents

Buse de pulvérisation avec rétrécissement de pré-atomisation, et tête de pulvérisation et dispositif de pulvérisation comprenant une telle buse Download PDF

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Publication number
EP3479906B1
EP3479906B1 EP18204718.3A EP18204718A EP3479906B1 EP 3479906 B1 EP3479906 B1 EP 3479906B1 EP 18204718 A EP18204718 A EP 18204718A EP 3479906 B1 EP3479906 B1 EP 3479906B1
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EP
European Patent Office
Prior art keywords
spraying
nozzle
product
orifice
atomization
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Application number
EP18204718.3A
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German (de)
English (en)
French (fr)
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EP3479906A1 (fr
Inventor
Tarik Bennani
Thibault Cognon
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Exel Industries SA
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Exel Industries SA
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Publication of EP3479906A1 publication Critical patent/EP3479906A1/fr
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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
    • 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
    • B05B1/10—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 the form of a fine jet, e.g. for use in wind-screen washers
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0278—Arrangement or mounting of spray heads
    • 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
    • B05B7/0012—Apparatus for achieving spraying before discharge from the apparatus
    • 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
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0483—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with gas and liquid jets intersecting in the mixing chamber
    • 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
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2464—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device a liquid being fed by mechanical pumping from the container to the nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material

Definitions

  • the present invention relates to a spray nozzle for spraying a product, of the type defining a passage for the circulation of the product through the nozzle, said passage opening out to the outside of the nozzle, at an upstream end thereof. , by a wide connection orifice, and at a downstream end of the nozzle by a narrow spray orifice, suitable for spraying the product.
  • the invention also relates to a spray head for a product spraying device, of the type comprising an annular ring having a central orifice, and a spray nozzle of the aforementioned type housed in said central orifice, substantially coaxially with the annular ring.
  • the invention also relates to a spraying installation of the type comprising a source of product to be sprayed and a spray head of the aforementioned type, the source of product to be sprayed being fluidly connected to the connection orifice of the spray nozzle.
  • Spraying installations of the aforementioned type are known. They are intended to ensure the bursting of a coating product into fine droplets so as to coat a large surface with a small amount of product.
  • the coating material is supplied under pressure from a source and conveyed under pressure to a spray nozzle.
  • US 2012/097765 A1 discloses a fine finish tip spray apparatus with an atomizing section comprising a first fluid impact port, i.e., a pre-orifice, inclined towards an expansion chamber and a second fluid impact port. next fluid impact.
  • the coating product is supplied by the source with a very low overpressure relative to atmospheric pressure, typically between 0.5 and 1.5 bars. Compressed air is blown at the outlet of the nozzle and it is this compressed air which atomizes the liquid film ejected by the nozzle.
  • This solution has the advantage of having a very high quality of finish. It is also relatively inexpensive. However, it has the drawback of exhibiting a low transfer rate, a large amount of the coating product being dispersed in the environment without reaching the surface to be coated.
  • Another solution is airless spraying.
  • the coating product is supplied by the source at very high pressure, typically at a pressure of between 160 and 300 bars. It is then the narrowness of the spray orifice which causes the product to burst. There is no air involved.
  • This solution has the advantage of an excellent transfer rate.
  • it has the drawback of requiring pumping equipment capable of supplying the coating product at very high pressure, and involves very high compressed air consumption for supplying these pumps. This makes it an expensive technology.
  • a final solution consists of mixed spraying.
  • the coating product is supplied by the high pressure source, typically at a pressure of between 50 and 150 bars.
  • airless spraying then it is the narrowness of the spray orifice that causes the product to burst.
  • This spraying is not optimal, however, given the relatively low pressure at which the coating product is supplied by the source.
  • compressed air is blown out of the nozzle, as in pneumatic spray technology.
  • This solution makes it possible to obtain substantially the same quality of finish as with airless spraying, with a good transfer rate, while being more economical since the coating product is supplied at a lower pressure.
  • it has the drawback of remaining relatively expensive compared to the pneumatic spray solution.
  • the invention relates to a spray nozzle of the aforementioned type, in which the passage has, between the connection orifice and the spray orifice, at least one pre-atomization restriction capable of atomizing the product. , followed by a widening downstream of said pre-atomization constriction.
  • a subject of the invention is also a spray head of the aforementioned type, in which the spray nozzle consists of a nozzle as defined above.
  • a further subject of the invention is a spray gun comprising a spray head as defined above.
  • a further subject of the invention is a spraying installation of the aforementioned type, in which the spray head consists of a head as defined above.
  • a further subject of the invention is a spraying method of the aforementioned type, in which the spray nozzle consists of a nozzle as defined above.
  • the spraying installation 10 shown in Figure 1 comprises, in a known manner, a source 12 of coating product, a supply 13 of compressed gas, an applicator 14 for applying the coating product to a surface to be coated, a first fluidic link 15 fluidly connecting the source 12 to the 'applicator 14, and a second fluidic connection 16 fluidly connecting the supply 13 to the applicator 14.
  • the coating product is advantageously constituted by a fluid, for example by a paint, a tint, an adhesive, or a mastic having typically a viscosity between 20mPa.s and 500mPa.s
  • the source 12 is suitable for supplying the coating product at an outlet pressure of between 20 and 300 bars, in particular between 20 and 150 bars and advantageously between 20 and 80 bars.
  • the source 12 typically comprises a reservoir of coating product (not shown), and a pump (not shown) for pumping the coating product into the reservoir and delivering it to the fluidic connection 16 at the outlet pressure.
  • the supply 13 is suitable for supplying a gas, typically air, compressed, preferably at a pressure between 0.2 bar and 6 bar, advantageously between 0.2 bar and 2 bar.
  • the power supply 13 is for example constituted by an air compressor.
  • the first fluidic link 15 fluidly connects an outlet 17 of the source 12 to a first inlet 18 of the applicator 14. It is typically formed by a flexible pipe.
  • the second fluidic link 16 fluidly connects an outlet 19 of the supply 13 to a second inlet 20 of the applicator 14. It is typically formed by a flexible pipe.
  • the applicator 14 comprises a body 21 and a spray head 22 mounted on the body 20.
  • the body 21 carries the first inlet 18 of the applicator 14 and comprises a tube 23 internally defining a duct (not shown) fluidly connecting said inlet 18 to an orifice 24 for outlet of the coating product from the body 21, said orifice 24 defining the end of the tube 23.
  • the body 21 also carries the second inlet 20 and internally defines a cavity (not shown) fluidly connecting said inlet 20 to an orifice 26 for the outlet of compressed gas outside the body 21.
  • the orifice 26 is, in the example shown, arranged concentrically around port 24.
  • the applicator 14 consists of a spray gun.
  • the body 21 is therefore shaped in the form of a butt and carries a trigger 28 capable of actuating a valve (not shown) and of being moved relative to the body 21 between a position at rest, in which the valve closes the fluid connections between the inlets 18. , 20 and the outlet ports 24, 26, and an actuated position, in which the valve releases said fluid connections.
  • the spray gun 14 is typically a manual spray gun. Alternatively, the spray gun 14 is an automatic spray gun.
  • the spray head 22 comprises an annular ring 30 having a central orifice 32, and a spray nozzle 34 housed in said central orifice 32.
  • the annular ring 30 is centered on an axis A-A '. It comprises an annular body 36 defining the central orifice 32, and a skirt 38 rotatably mounted about the axis A-A 'relative to the body 36.
  • the body 36 has a downstream face 40, oriented away from the body 21, and an upstream face 42 facing the body 21.
  • the body 36 further defines a plurality of air channels 44 ( Figure 3 ), 46, rectilinear, opening into the upstream 42 and downstream 40 faces, each air channel 44, 46 being oriented in a converging direction, that is to say intersecting the axis A-A '.
  • the spray head 22 is mounted on the body 21 so that the air channels 44, 46 are fluidly connected to the outlet port 26. Thus, the air channels 44, 46 are fluidly connected to the source 13. of compressed gas.
  • the air channels 44, 46 in particular comprise first air channels 44, which converge on the nozzle 34, and second air channels 46, which converge downstream from the nozzle 34.
  • the skirt 38 projects upstream with respect to the body 36. It has an internal thread 50 able to cooperate with a complementary external thread 52 formed on the body 21 so as to be able to be screwed onto the body 21. It defines an upstream end. 54 for connecting the ring 30 to the body 21.
  • the downstream face 40 is oriented opposite this upstream end 54.
  • the spray nozzle 34 has an upstream end 56, oriented towards the body 21, and a downstream end 58, oriented away from the body 21.
  • the nozzle 34 also defines a passage 60 for the circulation of the coating product to through the nozzle 34, said passage 60 opening out to the outside of the nozzle 34, at the upstream end 56, by a wide connection orifice 62, and at the downstream end 58 by a narrow spray orifice 64, suitable for spray the product the coating product.
  • the spray orifice 64 typically has a diameter substantially between 0.3mm and 1.15mm.
  • the outer diameter of the nozzle 34 is, for its part, preferably less than 15 mm.
  • connection port 62 is fluidly connected to the outlet port 24 of the body 21.
  • the tube 23 is engaged in the passage 60 through the connection port 62.
  • connection orifice 62 is fluidly connected to the source 12 of coating product.
  • the passage 60 has, between the connection orifice 62 and the spray orifice 64, at least one pre-atomization constriction 66, capable of atomizing the product, the or each constriction 66 being followed by a widening 68 downstream of said constriction 66.
  • This pre-atomization restriction 66 makes it possible to obtain a finer spray at the outlet of the nozzle 34, and to lower the supply pressure of the nozzle 34 with coating product without adversely affecting the homogeneity of the jet of product in nozzle outlet 34.
  • the nozzle 34 comprises in particular a tubular body 70, a spray member 72, and a pre-atomization insert 74.
  • the body 70 is oriented in an axial direction B-B ', that is to say that the axial direction BB' forms the axis of the body 70.
  • the body 70 is in particular cylindrical of revolution about said axis B-B '.
  • the nozzle 34 is in particular arranged coaxially with the ring 30.
  • the axis B-B ' coincides with the axis A-A'.
  • the body 70 has a first axial end 76 defining the upstream end 56 of the nozzle 34, and a second axial end 78 opposite the first axial end 76.
  • the first axial end 76 is in particular planar and oriented transversely to the axial direction. B-B '.
  • the second axial end 78 is in particular frustoconical centered on the axis B-B '.
  • the body 70 internally defines a through duct 79 opening into the first axial end 76 through a first opening 80 and into the second axial end 78 through a second opening 82, the first opening 80 constituting, in the example shown, the orifice of connection 62.
  • the second opening 82 is in particular narrower than the first opening 80.
  • the through duct 79 has a first section 84 of large diameter and a second section 86 of small diameter.
  • the first section 84 opens to the outside of the body 70 through the first opening 80, and the second section 86 opens to the outside of the body 70 through the second opening 82.
  • the first section 84 has substantially the same diameter as the first opening 80.
  • the second section 86 has substantially the same diameter as the second opening 82.
  • the first and second sections 84, 86 are contiguous to one another and the body 70 defines, at the interface between the first and second sections 84, 86, a radial shoulder 88 oriented towards the first opening 80.
  • This shoulder 88 is in particular substantially plane and oriented transversely to the axis B-B '.
  • the spray member 72 has an upstream face 90, housed in the duct 79, and a downstream face 92, opposite the upstream face 90 and disposed outside the body 70.
  • the upstream face 90 is substantially planar and is disposed substantially transversely to the axis B-B '. It has a diameter substantially equal to the diameter of the first section 84 of the duct 79.
  • the downstream face 92 is in the form of a dome centered on the axis B-B 'and split with a slot 93 perpendicular to the axis B-B'. It is flush with the second axial end 78 of the body 70 at its periphery.
  • the slot 93 has lips which form an angle between them typically between 5 ° and 150 °, preferably between 20 ° and 110 °.
  • the spray member 72 defines the spray orifice 64.
  • the spray member 72 further comprises, from upstream to downstream, a cavity 94 of decreasing cross section downstream, followed by a channel 96 of substantially constant cross section fluidly connecting the cavity 94 to the spray orifice 64.
  • the cavity 94 opens into the upstream face 90, said upstream face 90 defining, around the cavity 94, an annular shoulder 97 oriented upstream.
  • the pre-atomization constriction 66 opens into the cavity 94, said cavity 94 defining the widening 68 downstream of said constriction 66.
  • the cavity 94 has, in the example shown, the shape of a bell.
  • the spray orifice 64 is formed by a constriction terminating the channel 96 and split by the slot 93. This constriction is in particular in the form of a dome.
  • the diameter of the spray orifice 64 is defined as being the major axis of the ellipse formed by the intersection of the slit 93 with said constriction.
  • the spray member 72 is in particular constituted by a spray insert attached to the body 70 and housed in part in the duct 79.
  • This insert 72 comprises a base 100 and, projecting axially from the base 100, along the axis B-B ', a finger 102 having a free end 104 opposite the base 100, said free end 104 defining the spray orifice 64 .
  • the base 100 is fully housed in the first section 84 of the duct 79. It has a cross section substantially complementary to that of said first section 84 and defines the upstream face 90. It also defines a radial shoulder 106, opposite the upstream face 90, resting against the shoulder 88 of the body 70.
  • the base 100 preferably has an axial thickness of less than 4 mm. It is in particular formed by a substantially planar plate orthogonal to the finger 102.
  • the finger 102 comprises a first section 108, cylindrical, and a second section 110 in the form of a dome.
  • the first section 108 is attached to the base 100. It is fully housed in the second section 86 of the duct 79. It has a cross section substantially equal to that of said second section 86.
  • the second section 110 is disposed outside the duct 79. It defines the free end 104 and the downstream face 92.
  • the pre-atomization insert 74 is attached to the body 70 by being housed in the duct 79, and defines the pre-atomization constriction 66.
  • the pre-atomization insert 74 comprises a base 112 and, projecting axially from the base 112, along the axis B-B ', a finger 114 having a free end 116 opposite the base 112, said free end 116 defining the pre-atomization shrinkage 66.
  • the base 112 is fully housed in the first section 84 of the duct 79. It has a cross section substantially complementary to that of said first section 84. It bears against the annular shoulder 97.
  • the base 112 also defines a downstream face 117 of the pre-atomization insert 74, oriented downstream and opposite to the annular shoulder 97.
  • the base 112 has at least one, in particular two, flat (s) 119, which prevents the insert 74 from rotating relative to the body 70.
  • the finger 114 is housed substantially entirely in the cavity 94.
  • the finger 114 comprises a first section 118 for connection to the base 112, and a second section 120 formed by the free end 116.
  • a first variant of the insert 74 shown in the figures. Figures 5 and 6 , it also comprises an intermediate section 122 between the first and second sections 118, 120.
  • the first section 118 is cylindrical. In the first variant, it extends from the base 112 to the intermediate section 122. In a second variant, shown in Figures 7 and 8 , it extends from the base 112 to the free end 116.
  • the free end 116 is in the form of a split dome with a slot 123 perpendicular to the axis B-B '. It is housed in the cavity 94 and is arranged so that the pre-atomization constriction 66 opens out at a distance from the channel 96 less than half the axial length of the cavity 94.
  • the slot 123 has lips which form between them an angle typically between 5 ° and 150 °, preferably between 20 ° and 110 °.
  • the intermediate section 122 when it exists, has a frustoconical shape and extends from the first section 118 to the second section 120.
  • the slot 123 extends into said intermediate section 122.
  • the pre-atomization insert 74 defines internally, from upstream to downstream, a cavity 124 of decreasing cross section downstream, followed by a channel 126 of substantially constant cross section fluidly connecting the cavity 124 to the constriction. pre-atomization 66.
  • the cavity 124 opens into the downstream face 117. It has, in the example shown, a downstream section 130, cylindrical, opening into the downstream face 117, and a frustoconical upstream section 132.
  • the pre-atomization constriction 66 is, in the example shown, formed by a hemispherical cavity 134 having a base 136 opening into the channel 126 and an apex 138, opposite the base 136, split by the slot 123. It has a diameter smaller than the cavity 94 of the spray member 72, this diameter being defined as being the major axis of the ellipse formed by the intersection of the slot 123 with the hemispherical cavity 134.
  • This specific shape of the pre-atomizing constriction 66 provides a finer spray and further lowers the feed pressure of the spray.
  • nozzle 34 made of coating product without adversely affecting the homogeneity of the jet of product leaving the nozzle 34.
  • the diameter of the pre-atomization constriction 66 is preferably between 0.3 mm and 1.15 mm and greater than or equal to the diameter of the spray orifice 64.
  • the diameter of the pre-atomization constriction 66 is such that the ratio of the diameter of the spray orifice 64 to the diameter of the pre-atomizing constriction 66 is between 0.5 and 1.0.
  • This ratio of diameters reinforces the fineness of the spraying and makes it possible to further lower the supply pressure of the nozzle 34 with coating product without adversely affecting the homogeneity of the jet of product at the outlet of the nozzle 34.
  • the passage 60 is thus formed successively, from upstream to downstream, by the cavity 124, followed by the channel 126, then by the pre-atomization constriction 66, before a downstream part of the cavity 94, followed by the channel 96 and , finally, the spray port 64.
  • the sources 12, 13 of coating material and compressed gas are activated.
  • the inlets 18, 20 of the body 21 are then supplied with coating product and pressurized gas.
  • a user actuates the trigger 28.
  • This has the effect of placing the inlets 18, 20 respectively in fluid communication with the outlets 24, 26.
  • the spray nozzle 34 is then supplied, through its connection orifice 62, with product. coating, said coating product being at a pressure of between 20 and 300 bars, in particular between 20 and 150 bars and advantageously between 20 and 80 bars.
  • the air channels 44, 46 are found supplied with pressurized gas.
  • the coating product arriving under pressure, is atomized a first time when it passes through the pre-atomization constriction 66. It then disperses in the form of droplets in the downstream part of the cavity 94, before entering the channel 96. and to be atomized a second time when it passes through the spray orifice 64. The coating product then disperses in the form of droplets in the space at the outlet of the nozzle 34. This dispersion is increased by the compressed gas. blown through the channels 44, 46 which strikes these droplets and burst them.
  • the compactness of the pre-atomization insert 74 makes it possible to use for the body 70 of the nozzle 34, the spray insert 72 and the ring 30 the same as those usually used for mixed spraying. It is thus possible to equip existing spraying installations very easily and inexpensively.
  • the compactness of the pre-atomization insert 74 makes it possible to minimize dead volumes and, thus, avoids unwanted flows when the trigger 28 is released, in particular when using very fluid products such as tints or top-coat paints for example.
  • the installation 10 does not include a source of compressed gas fluidly connected to the applicator 14.
  • the coating product is then sprayed without air.
  • the source 12 of coating product is suitable for supplying the coating product at a pressure greater than 20 bar, preferably greater than 100 bar, and the coating product is supplied at such a pressure during the spraying process. .
  • the invention here makes it possible, in airless spraying, to obtain a finish quality and a transfer rate similar to those usually encountered, however with a reduced coating product supply pressure. .
  • the compactness of the pre-atomization insert 74 allows the body 70 of the nozzle 34, the spray insert 72 and the ring 30 to be used the same as those usually used for airless spraying. It is thus possible to equip existing spraying installations very easily and inexpensively.
  • the compactness of the pre-atomization insert 74 makes it possible to minimize dead volumes and, thus, prevents unwanted flows when the trigger 28 is released, in particular when using very fluid products such as tints. or top-coat paints for example.
EP18204718.3A 2017-11-07 2018-11-06 Buse de pulvérisation avec rétrécissement de pré-atomisation, et tête de pulvérisation et dispositif de pulvérisation comprenant une telle buse Active EP3479906B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1760419A FR3073155B1 (fr) 2017-11-07 2017-11-07 Buse de pulverisation avec retrecissement de pre-atomisation, et tete de pulverisation et dispositif de pulverisation comprenant une telle buse

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EP3479906A1 EP3479906A1 (fr) 2019-05-08
EP3479906B1 true EP3479906B1 (fr) 2021-07-21

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US (1) US11065631B2 (ru)
EP (1) EP3479906B1 (ru)
JP (1) JP7343272B2 (ru)
KR (1) KR102646878B1 (ru)
CN (1) CN110026301A (ru)
BR (1) BR102018072813A2 (ru)
CA (1) CA3023570A1 (ru)
ES (1) ES2883690T3 (ru)
FR (1) FR3073155B1 (ru)
RU (1) RU2018138829A (ru)

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Publication number Priority date Publication date Assignee Title
CN110326803A (zh) * 2019-07-18 2019-10-15 浙江省海洋水产研究所 一种水产饲料油剂喷涂装置
CN112337730B (zh) * 2019-08-08 2022-05-27 3M创新有限公司 点胶喷嘴和点胶装置
EP4197645A1 (en) * 2021-12-14 2023-06-21 Yara International ASA Coating device

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US25372A (en) * 1859-09-06 Gas-btjbneb
US2569251A (en) * 1946-01-17 1951-09-25 Colorator Ab Spraying device and operation thereof
US3709433A (en) * 1971-03-25 1973-01-09 Handaille Ind Inc Method of and apparatus for generating mist
IT992150B (it) * 1973-05-29 1975-09-10 Turbosol A I Srl Testina spruzzatrice di impasti cementizi per l applicazione mec canica di intonaci
US4925101A (en) * 1988-08-26 1990-05-15 Nordson Corporation Wax spray gun and nozzle
JP2729395B2 (ja) * 1989-03-08 1998-03-18 旭サナック株式会社 液体加圧噴霧用ノズルチップ
JP2710398B2 (ja) * 1989-04-14 1998-02-10 株式会社いけうち 二流体ノズル
US5170941A (en) * 1989-04-20 1992-12-15 Iwata Air Compressor Mfg. Co., Ltd. Premixing-type spray gun
CA2039086A1 (en) * 1991-03-26 1992-09-27 Thomas Barty Spray gun nozzle head
DE4338585A1 (de) * 1993-11-11 1995-05-18 Graef Jordt Steffen Injektordüse
GB2288348A (en) * 1994-04-13 1995-10-18 Graco Inc Spray tip assembly
US5829682A (en) * 1996-04-26 1998-11-03 Spraying Systems Co. Air-assisted spray nozzle assembly
US6267301B1 (en) * 1999-06-11 2001-07-31 Spraying Systems Co. Air atomizing nozzle assembly with improved air cap
US6478239B2 (en) * 2000-01-25 2002-11-12 John Zink Company, Llc High efficiency fuel oil atomizer
US7762476B2 (en) * 2002-08-19 2010-07-27 Illinois Tool Works Inc. Spray gun with improved atomization
JP4397608B2 (ja) * 2003-03-18 2010-01-13 独立行政法人農業・食品産業技術総合研究機構 噴霧ノズル
US7163163B2 (en) * 2003-07-07 2007-01-16 Hypro, Llc Wide angle nozzle for agricultural sprayers
US8545937B2 (en) * 2009-08-31 2013-10-01 Nordson Corporation Spray coating with uniform flow distribution
CN201702048U (zh) * 2010-05-28 2011-01-12 精美铝业有限公司 喷嘴
US8814070B2 (en) * 2010-10-20 2014-08-26 Finishing Brands Holdings, Inc. Fine finish airless spray tip assembly for a spray gun
CN204620233U (zh) * 2015-02-07 2015-09-09 恺霖卫浴科技（厦门）有限公司 一种能出烛焰形状水的出水结构及安装此结构的花洒
CN104874498B (zh) * 2015-05-11 2017-06-23 山东科技大学 一种高低压内外混合式空气雾化喷嘴

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JP2019084529A (ja) 2019-06-06
FR3073155A1 (fr) 2019-05-10
RU2018138829A3 (ru) 2021-12-14
BR102018072813A2 (pt) 2019-10-01
EP3479906A1 (fr) 2019-05-08
RU2018138829A (ru) 2020-05-15
KR20190051874A (ko) 2019-05-15
KR102646878B1 (ko) 2024-03-12
FR3073155B1 (fr) 2020-09-11
CN110026301A (zh) 2019-07-19
CA3023570A1 (en) 2019-05-07
JP7343272B2 (ja) 2023-09-12
US11065631B2 (en) 2021-07-20
US20190151870A1 (en) 2019-05-23
ES2883690T3 (es) 2021-12-09

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