EP3296022A1 - Device for rotating a fluid inside a spray nozzle, assembly comprising such a device and coating device - Google Patents

Device for rotating a fluid inside a spray nozzle, assembly comprising such a device and coating device Download PDF

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Publication number
EP3296022A1
EP3296022A1 EP17190768.6A EP17190768A EP3296022A1 EP 3296022 A1 EP3296022 A1 EP 3296022A1 EP 17190768 A EP17190768 A EP 17190768A EP 3296022 A1 EP3296022 A1 EP 3296022A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
frustoconical
fluid
cylindrical
passage
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
EP17190768.6A
Other languages
German (de)
French (fr)
Other versions
EP3296022B1 (en
Inventor
Tarik Bennani
Thibault Cognon
Romain Gaillet
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 EP3296022A1 publication Critical patent/EP3296022A1/en
Application granted granted Critical
Publication of EP3296022B1 publication Critical patent/EP3296022B1/en
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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
    • B05B7/025—Nozzles having elongated outlets, e.g. slots, for the material to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • 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
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • 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
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3415—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with swirl imparting inserts upstream of the swirl chamber
    • 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
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3468—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with means for controlling the flow of liquid entering or leaving the swirl chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers
    • 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
    • B05B7/0408—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing two or more liquids
    • 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
    • B05B7/066—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 with an inner liquid outlet surrounded by at least one annular 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
    • B05B7/02—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
    • B05B7/0823—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 comprising a rotatable spray pattern adjusting plate controlling the flow rate of the spray shaping gas jets
    • 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
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1209—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means for each liquid or other fluent material being manual and interdependent
    • B05B7/1218—With means for adjusting or modifying the action of the controlling means
    • 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
    • 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
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
    • 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
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
    • B05B7/1272—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated actuated by gas involved in spraying, i.e. exiting the nozzle, e.g. as a spraying or jet shaping gas
    • 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
    • B05B7/26—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device
    • B05B7/28—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid
    • B05B7/32—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid the fed liquid or other fluent material being under pressure

Definitions

  • the present invention relates to a device for rotating a fluid circulating inside a nozzle.
  • the invention applies to the nozzle of a spray gun of a coating product, whether manual or automatic.
  • a spray gun comprises a spray head with a head ring and the nozzle, which is arranged coaxially inside the head.
  • the nozzle comprises a liquid passage channel configured to be selectively closed by a needle movable in translation inside the nozzle. The movement of the needle regulates the opening of the passage of the coating product. Depending on the position of the needle, the coating product will be expelled from the nozzle with more or less flow.
  • the spray head disposed around the nozzle comprises two horns each traversed by a compressed air ejection duct. Each duct is configured so that air is expelled radially towards the coating product spray. The latter is then atomized into fine droplets under the impact of high-pressure air jets. The size of the droplets is even thinner as the pressure of compressed air is important. However, a too high compressed air pressure leads to the formation of a fog which reduces the transfer rate of the gun, that is to say the ratio between the amount of product sprayed by the gun and the amount of product actually deposited on the part to be coated (overspray).
  • EP-A-1,391,246 discloses a solution for improving atomization without increasing the pressure of compressed air.
  • This solution consists in accommodating, inside the central conduit of the nozzle, a device for breaking up the liquid flow.
  • This device comprises a housing, a seat for positioning the housing and a spacer part.
  • the housing and the seat define product passage holes, arranged to impose sudden directional changes in the flow of coating product, which disrupts the flow.
  • the flow is thus destabilized upstream of the outlet orifice and the product is ejected from the nozzle in a turbulent form, that is to say partly defragmented.
  • the disadvantages of this device are its inability to expand the spray, its cost of manufacture (three separate parts) and mounting difficulties. In addition, this device is difficult to clean.
  • the invention more particularly intends to remedy by proposing a rotator device that is easier to manufacture, less expensive, and easier to mount inside the nozzle.
  • the invention relates to a device for rotating a fluid inside a nozzle, the device comprising a body delimiting at least one helical groove and / or a helical hole for the passage of all or part of fluid.
  • the groove (s) and / or hole (s) of the device give the liquid circulating inside the nozzle a helical direction around a spraying axis.
  • the rotation upstream of the outlet orifice of the nozzle results in an enlargement of the spray.
  • the flow is destabilized, even turbulent, which makes it easier to atomize.
  • the device makes it possible to obtain a distribution of drops of a finer size, without increasing the pressure and / or the flow rate of the atomizing air jets.
  • the device makes it possible to obtain a spray gun with a fineness of atomization identical to that of the guns of the prior art, but with a lower consumption of compressed air, and therefore a better yield.
  • the invention also relates to an assembly comprising a device as described above and one of a nozzle and a closing needle of the nozzle.
  • the device and said part are integral with each other or one piece.
  • the invention finally relates to an application device, such as a manual or automatic spray gun, comprising an assembly or a device as described above.
  • the device is immobilized inside a liquid passage conduit defined by a nozzle.
  • the conduit defines a receiving housing of the device which is of complementary shape to that of an envelope surface of the body of the device.
  • the device comprises a nozzle which delimits a fluid passage duct, while the duct comprises a flared ejection section and of rounded shape.
  • the coating product may be a liquid comprising one or more components or a powdery material. It can be paint, a primer, a varnish, etc.
  • the pistol 1 comprises a body 10, a grasping grip 11 and an actuating trigger 12 hinged to the body 10.
  • the pistol 1 comprises a spray head 14 and a head ring 16 disposed around the head 14.
  • the head 14 and the head ring 16 are centered on an X-X 'sputtering axis.
  • the spray head 14 may advantageously be pivoted about the axis XX 'to direct the spray in a substantially horizontal plane, as in the configuration of the Figures 1 to 3 , or in a substantially vertical plane, as in the configuration of figure 6 to 8 .
  • the head 14 is hollow. It comprises two protuberances 14a and 14b, more commonly known as horns or ears, which are arranged diametrically opposite one another.
  • the horns 14a and 14b protrude parallel to the axis XX 'relative to the rest of the head 14. They each delimit two orifices 140 for ejection of compressed air.
  • the orifices 140 are shaped to guide air jets in the direction of the X-X 'spraying axis. More specifically, the air jets from the orifices 140 have a substantially radial direction and centripetal with respect to the spray axis XX 'of the gun.
  • the adjective "substantially” means that there is a difference of a few degrees between a rigorously radial direction to the axis XX 'and the direction of the air jets.
  • the gun represented at figure 1 is therefore a pneumatic type gun, using jets of air for the formation of the spray.
  • a nozzle 2 is disposed coaxially inside the head 14.
  • the nozzle 2 is a standard spray gun nozzle. It is a piece with a geometry of revolution around the axis X-X '.
  • the nozzle 2 comprises two coaxial portions 2a and 2b, the portion 2a being disposed inside the part 2b.
  • the nozzle 2 defines a duct 6 for the product.
  • the duct 6 is located inside the part 2a.
  • the nozzle 2 is a nozzle of the "flat jet” type, that is to say that it is a nozzle whose imprint takes the form of a stretched ellipse.
  • the nozzle 2 may be a nozzle of the type "Round jet", that is to say a nozzle whose imprint takes the form of a disc or a ring.
  • the duct 6 is configured to be closed selectively by a needle 22 movable axially in translation inside the nozzle 2.
  • the displacement of the needle 22 is controlled by the trigger 12.
  • a return spring (not shown) allows to recall the needle valve in the closed position when the operator releases the trigger 12.
  • An upstream direction is defined as a direction oriented in the opposite direction to the liquid flow and a downstream direction as a direction oriented in the direction of flow.
  • the upstream is directed to the right, while the downstream is directed to the left.
  • duct 6 comprises, from upstream to downstream, a first segment 60, cylindrical, a second section 62, frustoconical, whose passage section decreases from upstream to downstream, a third section 64, also frustoconical and whose section decreases from upstream to downstream and an ejection channel 66, of constant passage section.
  • the "caliber" of a nozzle corresponds to the diameter of the last passage section of the fluid before ejection, that is to say in the example to the diameter d66 of the ejection channel 66.
  • the size of a nozzle varies between 0.4 mm (4 gauge nozzle) and 2.7 mm (27 gauge nozzle).
  • a plane P is defined as the sealing plane of the needle 22 inside the nozzle 2.
  • the plane P is perpendicular to the spray axis X-X '. As visible at figure 3 , the plane P is disposed at the interface between the section 64 and the channel 66.
  • the nozzle 2 according to the invention has the advantage that the position of the sealing plane P along the axis XX 'is standard, c' that is to say that the nozzle 2 is compatible with an existing needle trade, such as the needle 22. This ensures the flow rate of the nozzle 2 and limit the presence of dead volumes, likely to retain product and cause the formation of drops after the closure of the nozzle 2.
  • buttons 18 and 20, visible to the figure 1 are provided to interrupt respectively the product spraying and the use of compressed air.
  • Removable device 30 is immobilized inside conduit 6.
  • Device 30 is designed for standard gun nozzles. It is a device for rotating the fluid flowing inside the conduit 6. It comprises a body 32, the envelope surface S32 is circular section. The envelope surface is defined as a surface surrounding the body 32. It is then possible to imagine the surface S32 as the surface body 32 when it is wrapped in a film of zero thickness. The envelope surface S32 is centered on an axis X32 which coincides with the axis XX 'when the device 30 is in place inside the duct 6.
  • the device 30 is a machined metal part.
  • the device 30 may be of plastics material and may be made by other means, such as by molding or by means of a 3D printer.
  • the envelope surface S32 of the body comprises a cylindrical portion S32a and a frustoconical portion S32b disposed downstream of the cylindrical portion S32a.
  • the diameter of the frustoconical portion S32b of the surface S32 decreases going downstream.
  • the angle of convergence A32b of the frustoconical portion S32b is between 10 and 350 °, in particular between 10 ° and 180 ° or between 180 ° and 350 °, preferably from 10 to 80 °, here equal to 60 °.
  • the conduit 6 defines a receiving housing of the device 30 which is of complementary shape to that of the body 32.
  • the diameter of the housing 60 is identical in all respects to the diameter of the envelope surface S32.
  • This housing is formed by the sections 60 and 62 of the duct 6.
  • the diameter of the cylindrical portion S32a of the casing surface of the body 32 is substantially identical to the diameter of the cylindrical section 60 of the duct 6 and the convergence angle the frustoconical part S32b of the surface S32 is identical to that of the section 62.
  • the device 30 is slid inside the duct 6. It is in the example long enough to remain immobile in translation during the handling of the gun 1.
  • an additional device for abutting such as a tubular liner mounted tight or glued inside the duct 6, can be incorporated in the nozzle 2 to keep the device 30 immobile in translation.
  • the device 30 can also be mounted in force inside the duct 6.
  • the body 32 comprises at least one helical groove 34, preferably four helical grooves 34, each having a pitch of between 1 mm and 50 mm, in the example equal to 20 mm.
  • the pitch of each groove 34 is constant. However, in a variant not shown, this step may be variable.
  • Each groove 34 extends on the outer surface of the body 32 and defines a conduit for the product. More specifically, in operation, the product flows in the grooves 34, between the body 32 and the constituent wall of the duct 6.
  • the grooves 34 give the fluid a helical direction around the axis of spray X-X '.
  • the fluid velocity at the outlet of the device 30 therefore has an axial component and a radial component with respect to the X-X 'sputtering axis.
  • the body 32 comprises a cylindrical upstream portion and a frustoconical downstream portion, and each helical groove 34 extends continuously to the surface of the cylindrical upstream portion and to the surface of the frustoconical downstream portion.
  • the depth P34 of each groove 34 is between 1% and 49% of the maximum diameter of the surface S32, in particular equal to 25% of this diameter.
  • the device 30 is monobloc, which facilitates assembly.
  • the ratio between the radial velocity component and the axial velocity component at the output of the device 30 depends on the pitch of the groove or grooves 34.
  • the rotational component of the velocity vector of the fluid at the outlet of the device 30 is all the more important as the step is weak.
  • the pitch is chosen lower when the fluid is viscous.
  • the rotational component of the velocity vector at the output of the device 30 is approximately three times greater than the axial component.
  • the rotary effect is attenuated at the nozzle outlet for the nozzles 2 of small caliber, especially for nozzles whose caliber is less than 0.9 mm, because the fluid undergoes a strong axial acceleration in the channel 66 because of the reduction of the passage section.
  • the axial component of the nozzle outlet fluid predominates over the radial component.
  • the device 30 is rather intended to be mounted inside the nozzles whose gauge is at least 0.9 mm.
  • the device 30 is driven as deep as possible inside the conduit 6, that is to say closer to the outlet orifice of the nozzle 2.
  • the distance d1 between the downstream end of the device 30 and the outlet orifice of the nozzle 2 is less than 10 mm, in particular equal to 6 mm. This ensures that the fluid maintains its rotation until the outlet of the nozzle 2.
  • the device 30 further comprises a handle 36, which is of reduced diameter relative to the body 32.
  • the handle 36 extends axially upstream relative to the body 32. It advantageously allows manual removal the device 30 out of the nozzle 2 for cleaning and / or replacement purposes.
  • the handle 36 advantageously extends over a length 136 at least equal to 5 mm. This minimum length makes it possible to manually push the device 30 as deep as possible inside the duct 6, that is to say closer to the outlet orifice of the nozzle 2.
  • the device 30 delimits a through bore 38 for the passage of the needle 22 closing the nozzle 2.
  • the bore 38 extends axially through the handle 36 and the body 32.
  • the diameter d38 of the bore 38 is substantially equal to the diameter of the needle 22, so that the product does not pass inside the body 32.
  • the diameter of the bore 38 may be chosen greater than the diameter of the needle 22 so that the product can pass inside the body 32. This has the advantage that the spray obtained is easier to spray and requires less energy (eg tire) to be sprayed.
  • the gun 1 comprises a fitting 40 for supplying the coating product.
  • This connector 40 is oriented perpendicular to the spray axis XX 'and extends in particular downwardly from the body 10 of the gun 1. It is intended to be connected to a product supply pipe (not shown ).
  • the path of the coating product from the connection 40 to the outlet orifice of the nozzle 2 is represented by the arrows F1 at the figure 8 .
  • Figures 9 and 10 represent a second embodiment of the invention.
  • This second mode relates to a device 30 for rotating a fluid inside a nozzle 2, this device comprising a body 32 defining at least one helical hole 33 for the passage of all or part of the fluid.
  • at least one groove 34 is replaced by a helical conduit, i.e. a hole 33 running through the body of the device 30 in a substantially helical direction.
  • a helical conduit i.e. a hole 33 running through the body of the device 30 in a substantially helical direction.
  • the body 32 defines several helical holes 33 for the passage of all or part of the fluid
  • the needle 22 and the device 30 are integral with each other.
  • the device 30 can be mounted tight around the needle 22 or crimped or glued to the needle 22.
  • the device 30 and the needle 22 can also be in one piece.
  • the nozzle 2 and the device 30 are releasably connected.
  • the nozzle 2 and the device 30 may be two pieces integral with one another or one and the same piece, manufactured for example by 3D printing.
  • the groove or grooves 34 of the device 30 are cleaned by solvent injection in place of the coating product.
  • the device 30 is mounted inside an automatic pistol, which operates without manual action from an operator and is controlled remotely.
  • the section and / or the width of the grooves 34 may be different from one groove to another.
  • the section and / or width of each groove may also vary along its length.
  • the section of each groove 34 may be rectangular, triangular, elliptical, polygonal or a shape inspired by these solutions (3D printing).
  • the area of the section may also be variable. It is between 0.2 mm 2 to 8 mm 2 .
  • the duct 6 of the nozzle 2 comprises an ejection section which is flared and of rounded shape. This makes it possible to further widen the spray at the nozzle outlet by Coanda effect.
  • This solution for expanding the jet is particularly suitable for small-caliber nozzles (less than 0.9 mm), for which the rotary effect imparted by the device 30 is less.
  • this type of nozzle provides a synergistic effect with the device 30 when the size is between 0.7 and 1.2 mm.
  • two rotation devices according to the invention that is to say comparable or identical to the rotating device 30, are arranged in series one behind the other at the same time.
  • the two devices have inverted steps: each groove of a first device has a step to the right, while each groove of the second device has a step to the left, or vice versa. This further destabilizes the fluid flow. Both devices can be made in one piece.
  • the application device comprises two separate coating product supply ducts. It can be the same product or two different products to mix.
  • Each supply duct communicates with a corresponding groove 34 of the device 30, which then comprises at least two grooves.
  • the products flowing in the two separate ducts are mixed downstream of the device 30. A portion of the fluid flowing inside the nozzle therefore passes through a groove.
  • each groove of the device communicates with a supply duct of separate coating product.
  • the number of product supply ducts may therefore be greater than 2.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Nozzles (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)

Abstract

L'invention concerne un dispositif (30) de mise en rotation d'un fluide à l'intérieur d'une buse (2), ce dispositif comprenant un corps délimitant au moins une rainure hélicoïdale (34) et/ou un trou hélicoïdal pour le passage de tout ou partie du fluide. Ce dispositif peut être solidaire d'une buse (2) ou d'un pointeau de fermeture de la buse. L'invention concerne également un dispositif d'application comprenant un tel dispositif.The invention relates to a device (30) for rotating a fluid inside a nozzle (2), this device comprising a body delimiting at least one helical groove (34) and / or a helical hole for the passage of all or part of the fluid. This device may be integral with a nozzle (2) or a closing needle of the nozzle. The invention also relates to an application device comprising such a device.

Description

La présente invention concerne un dispositif de mise en rotation d'un fluide circulant à l'intérieur d'une buse. Notamment, l'invention s'applique à la buse d'un pistolet de pulvérisation d'un produit de revêtement, qu'il soit manuel ou automatique.The present invention relates to a device for rotating a fluid circulating inside a nozzle. In particular, the invention applies to the nozzle of a spray gun of a coating product, whether manual or automatic.

De manière connue, un pistolet de pulvérisation comprend une tête de pulvérisation avec une bague de tête et la buse, qui est disposée coaxialement à l'intérieur de la tête. La buse comprend un canal de passage de liquide configuré pour être obturé sélectivement par un pointeau mobile en translation à l'intérieur de la buse. Le mouvement du pointeau régule l'ouverture du passage du produit de revêtement. Selon la position du pointeau, le produit de revêtement sera expulsé de la buse avec plus ou moins de débit.In known manner, a spray gun comprises a spray head with a head ring and the nozzle, which is arranged coaxially inside the head. The nozzle comprises a liquid passage channel configured to be selectively closed by a needle movable in translation inside the nozzle. The movement of the needle regulates the opening of the passage of the coating product. Depending on the position of the needle, the coating product will be expelled from the nozzle with more or less flow.

La tête de pulvérisation disposée autour de la buse comprend deux cornes traversées chacune par un conduit d'éjection d'air comprimé. Chaque conduit est configuré de sorte que l'air est expulsé radialement en direction du spray de produit de revêtement. Ce dernier est alors atomisé en fines gouttelettes sous l'impact des jets d'air haute-pression. La taille des gouttelettes est d'autant plus fine que la pression d'air comprimé est importante. Toutefois, une pression d'air comprimé trop élevée conduit à la formation d'un brouillard qui diminue le taux de transfert du pistolet, c'est-à-dire le ratio entre la quantité de produit pulvérisée par le pistolet et la quantité de produit réellement déposée sur la pièce à revêtir (overspray).The spray head disposed around the nozzle comprises two horns each traversed by a compressed air ejection duct. Each duct is configured so that air is expelled radially towards the coating product spray. The latter is then atomized into fine droplets under the impact of high-pressure air jets. The size of the droplets is even thinner as the pressure of compressed air is important. However, a too high compressed air pressure leads to the formation of a fog which reduces the transfer rate of the gun, that is to say the ratio between the amount of product sprayed by the gun and the amount of product actually deposited on the part to be coated (overspray).

EP-A-1 391 246 divulgue une solution pour améliorer l'atomisation sans accroitre la pression d'air comprimé. Cette solution consiste à loger, à l'intérieur du conduit central de la buse, un dispositif pour fragmenter l'écoulement liquide. Ce dispositif comprend un boitier, un siège pour positionner le boitier et une pièce d'entretoise. Le boitier et le siège délimitent des trous de passage du produit, agencés pour imposer des changements de direction brusques au flux de produit de revêtement, ce qui perturbe l'écoulement. L'écoulement est ainsi déstabilisé en amont de l'orifice de sortie et le produit est éjecté de la buse sous une forme turbulente, c'est à dire en partie défragmentée. Cela permet d'atomiser efficacement le jet de produit, sans augmenter pour autant la pression des jets d'air. Les inconvénients de ce dispositif sont son incapacité à élargir le spray, son coût de fabrication (trois pièces distinctes) et ses difficultés de montage. En outre, ce dispositif est difficile à nettoyer. EP-A-1,391,246 discloses a solution for improving atomization without increasing the pressure of compressed air. This solution consists in accommodating, inside the central conduit of the nozzle, a device for breaking up the liquid flow. This device comprises a housing, a seat for positioning the housing and a spacer part. The housing and the seat define product passage holes, arranged to impose sudden directional changes in the flow of coating product, which disrupts the flow. The flow is thus destabilized upstream of the outlet orifice and the product is ejected from the nozzle in a turbulent form, that is to say partly defragmented. This effectively atomizes the jet of product, without increasing the pressure of the air jets. The disadvantages of this device are its inability to expand the spray, its cost of manufacture (three separate parts) and mounting difficulties. In addition, this device is difficult to clean.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un dispositif de mise en rotation plus facile à fabriquer, moins cher, et plus facile à monter à l'intérieur de la buse.It is these drawbacks that the invention more particularly intends to remedy by proposing a rotator device that is easier to manufacture, less expensive, and easier to mount inside the nozzle.

A cet effet l'invention concerne un dispositif de mise en rotation d'un fluide à l'intérieur d'une buse, le dispositif comprenant un corps délimitant au moins une rainure hélicoïdale et/ou un trou hélicoïdal pour le passage de tout ou partie du fluide.For this purpose the invention relates to a device for rotating a fluid inside a nozzle, the device comprising a body delimiting at least one helical groove and / or a helical hole for the passage of all or part of fluid.

Grâce à l'invention, le ou les rainures et/ou le ou les trous du dispositif donnent au liquide circulant à l'intérieur de la buse une direction hélicoïdale autour d'un axe de pulvérisation. La rotation en amont de l'orifice de sortie de la buse se traduit par un élargissement du spray. En outre, l'écoulement est déstabilisé, voire turbulent, ce qui le rend plus facile à atomiser. Ainsi, le dispositif permet d'obtenir une distribution de gouttes de taille plus fine, sans pour autant augmenter la pression et/ou le débit des jets d'air d'atomisation. En d'autres termes, le dispositif permet d'obtenir un pistolet avec une finesse d'atomisation identique à celle des pistolets de l'art antérieur, mais avec une consommation en air comprimé moindre, et donc un meilleur rendement.Thanks to the invention, the groove (s) and / or hole (s) of the device give the liquid circulating inside the nozzle a helical direction around a spraying axis. The rotation upstream of the outlet orifice of the nozzle results in an enlargement of the spray. In addition, the flow is destabilized, even turbulent, which makes it easier to atomize. Thus, the device makes it possible to obtain a distribution of drops of a finer size, without increasing the pressure and / or the flow rate of the atomizing air jets. In other words, the device makes it possible to obtain a spray gun with a fineness of atomization identical to that of the guns of the prior art, but with a lower consumption of compressed air, and therefore a better yield.

Selon des aspects avantageux mais non obligatoires de l'invention, un tel dispositif peut comprendre une ou plusieurs des caractéristiques suivantes, prises dans toute combinaison techniquement admissible :

  • Une surface d'enveloppe du corps est à section circulaire ou elliptique.
  • La surface d'enveloppe du corps est au moins en partie cylindrique et/ou tronconique.
  • La surface d'enveloppe du corps comprend une partie amont cylindrique et une partie aval tronconique. Grâce à cette forme spécifique, le dispositif peut être enfoncé le plus profondément possible à l'intérieur de la buse, et notamment le plus près possible de l'orifice d'éjection de produit. En particulier, cet agencement est rendu possible grâce à la forme du dispositif, qui se termine en tronc de cône, puisque le conduit interne d'une buse comprend classiquement un tronçon de section tronconique avant le tronçon d'éjection de produit. Cet agencement au plus près de l'orifice d'éjection permet d'éviter que le fluide perde en vitesse, c'est-à-dire garantit que le fluide conserve sa rotation jusqu'à la sortie de la buse.
  • Le dispositif comprend en outre un manche de préhension, qui est de diamètre réduit par rapport au corps.
  • La longueur du manche est supérieure ou égale à 5 mm.
  • Le dispositif délimite un alésage central traversant pour le passage d'un pointeau de fermeture de la buse.
  • Le dispositif est fabriqué par impression 3D.
  • Le corps comprend une partie amont cylindrique et une partie aval tronconique, alors que chaque rainure hélicoïdale s'étend de manière continue à la surface de la partie amont cylindrique et à la surface de la partie aval tronconique.
  • Le corps comprend une partie amont cylindrique et une partie aval tronconique, alors que chaque trou hélicoïdal s'étend de manière continue à travers la partie cylindrique et à travers la partie tronconique du corps.
According to advantageous but non-obligatory aspects of the invention, such a device may comprise one or more of the following features, taken in any technically permissible combination:
  • An envelope surface of the body is circular or elliptical in section.
  • The envelope surface of the body is at least partly cylindrical and / or frustoconical.
  • The envelope surface of the body comprises a cylindrical upstream portion and a frustoconical downstream portion. With this specific form, the device can be driven as deep as possible inside the nozzle, and in particular as close as possible to the product ejection port. In particular, this arrangement is made possible by the shape of the device, which ends in a truncated cone, since the inner duct of a nozzle conventionally comprises a section of frustoconical section before the product ejection section. This arrangement closer to the ejection orifice prevents the fluid losing speed, that is to say ensures that the fluid retains its rotation to the outlet of the nozzle.
  • The device further comprises a grip handle, which is of reduced diameter relative to the body.
  • The length of the handle is greater than or equal to 5 mm.
  • The device defines a central through bore for the passage of a closing needle of the nozzle.
  • The device is manufactured by 3D printing.
  • The body comprises a cylindrical upstream portion and a frustoconical downstream portion, while each helical groove extends continuously to the surface of the cylindrical upstream portion and to the surface of the frustoconical downstream portion.
  • The body comprises a cylindrical upstream portion and a frustoconical downstream portion, while each helical hole extends continuously through the cylindrical portion and through the frustoconical portion of the body.

L'invention concerne également un ensemble comprenant un dispositif tel que décrit précédemment et une pièce parmi une buse et un pointeau de fermeture de la buse. Le dispositif et ladite pièce sont solidaires l'un de l'autre ou monobloc.The invention also relates to an assembly comprising a device as described above and one of a nozzle and a closing needle of the nozzle. The device and said part are integral with each other or one piece.

L'invention concerne enfin un dispositif d'application, tel qu'un pistolet de pulvérisation manuel ou automatique, comprenant un ensemble ou un dispositif tel que décrit précédemment.The invention finally relates to an application device, such as a manual or automatic spray gun, comprising an assembly or a device as described above.

Avantageusement, le dispositif est immobilisé à l'intérieur d'un conduit de passage de liquide délimité par une buse.Advantageously, the device is immobilized inside a liquid passage conduit defined by a nozzle.

Avantageusement, le conduit définit un logement de réception du dispositif qui est de forme complémentaire à celle d'une surface d'enveloppe du corps du dispositif.Advantageously, the conduit defines a receiving housing of the device which is of complementary shape to that of an envelope surface of the body of the device.

Avantageusement, le dispositif comprend une buse qui délimite un conduit de passage de fluide, alors que le conduit comprend un tronçon d'éjection évasé et de forme arrondie.Advantageously, the device comprises a nozzle which delimits a fluid passage duct, while the duct comprises a flared ejection section and of rounded shape.

L'invention et d'autres avantages de celle-ci apparaitront plus clairement à la lumière de la description qui va suivre de deux modes de réalisation d'un dispositif de mise en rotation conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins dans lesquels :

  • la figure 1 est une vue en perspective d'un pistolet pulvérisateur de produit de revêtement, comprenant un dispositif de mise en rotation conforme à un premier mode de réalisation de l'invention,
  • la figure 2 est une coupe partielle dans le plan II de la figure 1,
  • la figure 3 est une vue à plus grande échelle de l'encadré III de la figure 2,
  • la figure 4 est une vue en perspective du dispositif de mise en rotation,
  • la figure 5 est une coupe longitudinale du dispositif conforme à l'invention,
  • la figure 6 est une vue en élévation du pistolet de la figure 1, dans lequel la tête de pulvérisation a été pivotée de 90°,
  • la figure 7 est une vue à plus grande échelle de l'encerclé VII de la figure 6,
  • la figure 8 est une coupe (à plus grande échelle) dans le plan de la ligne VIII-VIII à la figure 7,
  • la figure 9 est une vue en perspective d'un dispositif de mise en rotation conforme à un second mode de réalisation de l'invention, et
  • la figure 10 est une coupe dans le plan X de la figure 9.
The invention and other advantages thereof will appear more clearly in the light of the following description of two embodiments of a rotation device according to its principle, given solely by way of example and with reference to the drawings in which:
  • the figure 1 is a perspective view of a coating product spray gun, comprising a rotation device according to a first embodiment of the invention,
  • the figure 2 is a partial section in the plane II of the figure 1 ,
  • the figure 3 is a larger-scale view of Box III of the figure 2 ,
  • the figure 4 is a perspective view of the rotation device,
  • the figure 5 is a longitudinal section of the device according to the invention,
  • the figure 6 is an elevation view of the gun from the figure 1 in which the spray head has been rotated 90 °,
  • the figure 7 is a larger-scale view of circled VII from the figure 6 ,
  • the figure 8 is a section (on a larger scale) in the plane of line VIII-VIII to figure 7 ,
  • the figure 9 is a perspective view of a rotation device according to a second embodiment of the invention, and
  • the figure 10 is a section in the X plane of the figure 9 .

Sur les figures 1 et 6 est représenté un pistolet manuel 1 pour la pulvérisation d'un produit de revêtement. Le produit de revêtement peut être un liquide comprenant un ou plusieurs composants ou un matériau pulvérulent. Il peut s'agir de peinture, d'un apprêt, d'un vernis, etc...On the figures 1 and 6 is shown a manual gun 1 for spraying a coating product. The coating product may be a liquid comprising one or more components or a powdery material. It can be paint, a primer, a varnish, etc.

Le pistolet 1 comprend un corps 10, une crosse de préhension 11 et une gâchette d'actionnement 12 articulée sur le corps 10. Le pistolet 1 comprend une tête de pulvérisation 14 et une bague de tête 16 disposée autour de la tête 14. La tête 14 et la bague de tête 16 sont centrées sur un axe de pulvérisation X-X'. La tête de pulvérisation 14 peut avantageusement être pivotée autour de l'axe X-X' pour diriger le spray dans un plan sensiblement horizontal, comme dans la configuration des figures 1 à 3, ou dans un plan sensiblement vertical, comme dans la configuration des figure 6 à 8.The pistol 1 comprises a body 10, a grasping grip 11 and an actuating trigger 12 hinged to the body 10. The pistol 1 comprises a spray head 14 and a head ring 16 disposed around the head 14. The head 14 and the head ring 16 are centered on an X-X 'sputtering axis. The spray head 14 may advantageously be pivoted about the axis XX 'to direct the spray in a substantially horizontal plane, as in the configuration of the Figures 1 to 3 , or in a substantially vertical plane, as in the configuration of figure 6 to 8 .

Comme visible à la figure 2, la tête 14 est creuse. Elle comprend deux protubérances 14a et 14b, plus communément appelées cornes ou oreilles, qui sont disposées de manière diamétralement opposée l'une par rapport à l'autre. Les cornes 14a et 14b font saillie de manière parallèle à l'axe X-X' par rapport au reste de la tête 14. Elles délimitent chacune deux orifices 140 d'éjection d'air comprimé. Les orifices 140 sont conformés pour guider des jets d'air en direction de l'axe de pulvérisation X-X'. Plus précisément, les jets d'air issus des orifices 140 ont une direction sensiblement radiale et centripète par rapport à l'axe de pulvérisation X-X' du pistolet. On entend par l'adjectif « sensiblement » qu'il y a un écart de quelques degrés entre une direction rigoureusement radiale à l'axe X-X' et la direction des jets d'air. Le pistolet représenté à la figure 1 est donc un pistolet du type pneumatique, utilisant des jets d'air pour la formation du spray.As visible at figure 2 the head 14 is hollow. It comprises two protuberances 14a and 14b, more commonly known as horns or ears, which are arranged diametrically opposite one another. The horns 14a and 14b protrude parallel to the axis XX 'relative to the rest of the head 14. They each delimit two orifices 140 for ejection of compressed air. The orifices 140 are shaped to guide air jets in the direction of the X-X 'spraying axis. More specifically, the air jets from the orifices 140 have a substantially radial direction and centripetal with respect to the spray axis XX 'of the gun. The adjective "substantially" means that there is a difference of a few degrees between a rigorously radial direction to the axis XX 'and the direction of the air jets. The gun represented at figure 1 is therefore a pneumatic type gun, using jets of air for the formation of the spray.

Une buse 2 est disposée coaxialement à l'intérieur de la tête 14. La buse 2 est une buse standard de pistolet de pulvérisation. II s'agit d'une pièce à géométrie de révolution autour de l'axe X-X'. Dans l'exemple, la buse 2 comprend deux parties coaxiales 2a et 2b, la partie 2a étant disposée à l'intérieur de la partie 2b. La buse 2 délimite un conduit 6 de passage pour le produit. Le conduit 6 est situé à l'intérieur de la partie 2a. La buse 2 est une buse de type « jet plat », c'est-à-dire qu'il s'agit d'une buse dont l'empreinte prend la forme d'une ellipse étirée. Toutefois, en variante, la buse 2 peut être une buse de type « jet rond », c'est-à-dire une buse dont l'empreinte prend la forme d'un disque ou d'un anneau.A nozzle 2 is disposed coaxially inside the head 14. The nozzle 2 is a standard spray gun nozzle. It is a piece with a geometry of revolution around the axis X-X '. In the example, the nozzle 2 comprises two coaxial portions 2a and 2b, the portion 2a being disposed inside the part 2b. The nozzle 2 defines a duct 6 for the product. The duct 6 is located inside the part 2a. The nozzle 2 is a nozzle of the "flat jet" type, that is to say that it is a nozzle whose imprint takes the form of a stretched ellipse. However, in a variant, the nozzle 2 may be a nozzle of the type "Round jet", that is to say a nozzle whose imprint takes the form of a disc or a ring.

Le conduit 6 est configuré pour être obturé sélectivement par un pointeau 22 mobile axialement en translation à l'intérieur de la buse 2. Le déplacement du pointeau 22 est commandé par la gâchette 12. Un ressort de rappel (non représenté) permet de rappeler le pointeau en position de fermeture lorsque l'opérateur relâche la gâchette 12.The duct 6 is configured to be closed selectively by a needle 22 movable axially in translation inside the nozzle 2. The displacement of the needle 22 is controlled by the trigger 12. A return spring (not shown) allows to recall the needle valve in the closed position when the operator releases the trigger 12.

On définit une direction amont comme une direction orientée dans le sens opposé à l'écoulement de liquide et une direction aval comme une direction orientée dans le sens de l'écoulement. Dans la configuration de la figure 2, l'amont est dirigé vers la droite, alors que l'aval est dirigé vers la gauche.An upstream direction is defined as a direction oriented in the opposite direction to the liquid flow and a downstream direction as a direction oriented in the direction of flow. In the configuration of the figure 2 , the upstream is directed to the right, while the downstream is directed to the left.

Comme visible aux figures 2 et 3, le conduit 6 comprend, de l'amont vers l'aval, un premier tronçon 60, cylindrique, un deuxième tronçon 62, tronconique, dont la section de passage diminue de l'amont vers l'aval, un troisième tronçon 64, également tronconique et dont la section diminue de l'amont vers l'aval et un canal d'éjection 66, de section de passage constante.As visible to Figures 2 and 3 , duct 6 comprises, from upstream to downstream, a first segment 60, cylindrical, a second section 62, frustoconical, whose passage section decreases from upstream to downstream, a third section 64, also frustoconical and whose section decreases from upstream to downstream and an ejection channel 66, of constant passage section.

Dans le présent document, le « calibre » d'une buse correspond au diamètre de la dernière section de passage du fluide avant éjection, c'est-à-dire dans l'exemple au diamètre d66 du canal d'éjection 66. En pratique, le calibre d'une buse varie entre 0,4 mm (buse de calibre 4) et 2,7 mm (buse de calibre 27).In this document, the "caliber" of a nozzle corresponds to the diameter of the last passage section of the fluid before ejection, that is to say in the example to the diameter d66 of the ejection channel 66. In practice , the size of a nozzle varies between 0.4 mm (4 gauge nozzle) and 2.7 mm (27 gauge nozzle).

On définit un plan P comme le plan d'étanchéité du pointeau 22 à l'intérieur de la buse 2. Le plan P est perpendiculaire à l'axe de pulvérisation X-X'. Comme visible à la figure 3, le plan P est disposé à l'interface entre le tronçon 64 et le canal 66. La buse 2 conforme à l'invention a pour avantage que la position du plan d'étanchéité P selon l'axe X-X' est standard, c'est-à-dire que la buse 2 est compatible avec un pointeau existant du commerce, tel que le pointeau 22. Cela permet de garantir le débit de la buse 2 et de limiter la présence de volumes morts, susceptibles de retenir du produit et de causer la formation de gouttes après la fermeture de la buse 2.A plane P is defined as the sealing plane of the needle 22 inside the nozzle 2. The plane P is perpendicular to the spray axis X-X '. As visible at figure 3 , the plane P is disposed at the interface between the section 64 and the channel 66. The nozzle 2 according to the invention has the advantage that the position of the sealing plane P along the axis XX 'is standard, c' that is to say that the nozzle 2 is compatible with an existing needle trade, such as the needle 22. This ensures the flow rate of the nozzle 2 and limit the presence of dead volumes, likely to retain product and cause the formation of drops after the closure of the nozzle 2.

En fonctionnement, les jets d'air issus des cornes 14a et 14b de la tête 14 percutent le jet de produit éjecté à travers la buse 2. Avantageusement, des boutons poussoirs 18 et 20, visibles à la figure 1, sont prévus pour interrompre respectivement la pulvérisation de produit et l'utilisation d'air comprimé.In operation, the air jets coming from the horns 14a and 14b of the head 14 strike the jet of product ejected through the nozzle 2. Advantageously, push buttons 18 and 20, visible to the figure 1 , are provided to interrupt respectively the product spraying and the use of compressed air.

Un dispositif amovible 30 est immobilisé à l'intérieur du conduit 6. Le dispositif 30 est conçu pour les buses standards de pistolet. II s'agit d'un dispositif de mise en rotation du fluide circulant à l'intérieur du conduit 6. II comprend un corps 32, dont la surface d'enveloppe S32 est à section circulaire. On définit la surface d'enveloppe comme une surface enveloppant le corps 32. On peut alors imaginer la surface S32 comme la surface du corps 32 lorsque celui-ci est enveloppé dans un film d'épaisseur nulle. La surface d'enveloppe S32 est centrée sur un axe X32 qui est confondu avec l'axe X-X' lorsque le dispositif 30 est en place à l'intérieur du conduit 6.Removable device 30 is immobilized inside conduit 6. Device 30 is designed for standard gun nozzles. It is a device for rotating the fluid flowing inside the conduit 6. It comprises a body 32, the envelope surface S32 is circular section. The envelope surface is defined as a surface surrounding the body 32. It is then possible to imagine the surface S32 as the surface body 32 when it is wrapped in a film of zero thickness. The envelope surface S32 is centered on an axis X32 which coincides with the axis XX 'when the device 30 is in place inside the duct 6.

Dans l'exemple, le dispositif 30 est une pièce métallique usinée. Toutefois, en variante, le dispositif 30 peut être en matière plastique et peut être réalisé par d'autres moyens, comme par moulage ou au moyen d'une imprimante 3D.In the example, the device 30 is a machined metal part. However, alternatively, the device 30 may be of plastics material and may be made by other means, such as by molding or by means of a 3D printer.

Dans l'exemple, la surface d'enveloppe S32 du corps comprend une partie cylindrique S32a et une partie tronconique S32b disposée en aval de la partie cylindrique S32a. Le diamètre de la partie tronconique S32b de la surface S32 diminue en allant vers l'aval. L'angle de convergence A32b de la partie tronconique S32b est compris entre 10 et 350°, notamment entre 10° et 180° ou entre 180° et 350 °, de préférence de 10 à 80°, ici égal à 60°.In the example, the envelope surface S32 of the body comprises a cylindrical portion S32a and a frustoconical portion S32b disposed downstream of the cylindrical portion S32a. The diameter of the frustoconical portion S32b of the surface S32 decreases going downstream. The angle of convergence A32b of the frustoconical portion S32b is between 10 and 350 °, in particular between 10 ° and 180 ° or between 180 ° and 350 °, preferably from 10 to 80 °, here equal to 60 °.

Le conduit 6 définit un logement de réception du dispositif 30 qui est de forme complémentaire à celle du corps 32. Autrement dit, le diamètre du logement 60 est en tout point identique au diamètre de la surface d'enveloppe S32. Ce logement est formé par les tronçons 60 et 62 du conduit 6. Ainsi, le diamètre de la partie cylindrique S32a de la surface d'enveloppe du corps 32 est sensiblement identique au diamètre du tronçon cylindrique 60 du conduit 6 et l'angle de convergence de la partie tronconique S32b de la surface S32 est identique à celui du tronçon 62.The conduit 6 defines a receiving housing of the device 30 which is of complementary shape to that of the body 32. In other words, the diameter of the housing 60 is identical in all respects to the diameter of the envelope surface S32. This housing is formed by the sections 60 and 62 of the duct 6. Thus, the diameter of the cylindrical portion S32a of the casing surface of the body 32 is substantially identical to the diameter of the cylindrical section 60 of the duct 6 and the convergence angle the frustoconical part S32b of the surface S32 is identical to that of the section 62.

En pratique, le dispositif 30 est glissé à l'intérieur du conduit 6. Il est dans l'exemple assez long pour rester immobile en translation lors de la manipulation du pistolet 1. En variante non représentée, un dispositif additionnel de mise en butée, tel qu'une chemise tubulaire montée serrée ou collée à l'intérieur du conduit 6, peut être incorporé à la buse 2 pour maintenir le dispositif 30 immobile en translation.In practice, the device 30 is slid inside the duct 6. It is in the example long enough to remain immobile in translation during the handling of the gun 1. In a variant not shown, an additional device for abutting, such as a tubular liner mounted tight or glued inside the duct 6, can be incorporated in the nozzle 2 to keep the device 30 immobile in translation.

D'autre part, le dispositif 30 peut également être monté en force à l'intérieur du conduit 6.On the other hand, the device 30 can also be mounted in force inside the duct 6.

Le corps 32 comporte au moins une rainure hélicoïdale 34, de préférence quatre rainures hélicoïdales 34, ayant chacune un pas compris entre 1 mm et 50 mm, dans l'exemple égal à 20 mm. Dans l'exemple, le pas de chaque rainure 34 est constant. Toutefois, en variante non représentée, ce pas peut être variable.The body 32 comprises at least one helical groove 34, preferably four helical grooves 34, each having a pitch of between 1 mm and 50 mm, in the example equal to 20 mm. In the example, the pitch of each groove 34 is constant. However, in a variant not shown, this step may be variable.

Chaque rainure 34 s'étend sur la surface extérieure du corps 32 et qui définit un conduit de passage pour le produit. Plus précisément, en fonctionnement, le produit circule dans les rainures 34, entre le corps 32 et la paroi constitutive du conduit 6. Les rainures 34 donnent au fluide une direction hélicoïdale autour de l'axe de pulvérisation X-X'. La vitesse du fluide en sortie du dispositif 30 a donc une composante axiale et une composante radiale par rapport à l'axe de pulvérisation X-X'.Each groove 34 extends on the outer surface of the body 32 and defines a conduit for the product. More specifically, in operation, the product flows in the grooves 34, between the body 32 and the constituent wall of the duct 6. The grooves 34 give the fluid a helical direction around the axis of spray X-X '. The fluid velocity at the outlet of the device 30 therefore has an axial component and a radial component with respect to the X-X 'sputtering axis.

Comme visible aux figures 4 et 5, le corps 32 comprend une partie amont cylindrique et une partie aval tronconique, et chaque rainure hélicoïdale 34 s'étend de manière continue à la surface de la partie amont cylindrique et à la surface de la partie aval tronconique.As visible to Figures 4 and 5 , the body 32 comprises a cylindrical upstream portion and a frustoconical downstream portion, and each helical groove 34 extends continuously to the surface of the cylindrical upstream portion and to the surface of the frustoconical downstream portion.

Avantageusement, la profondeur P34 de chaque rainure 34 est comprise entre 1% et 49% du diamètre maximal de la surface S32, notamment égale à 25% de ce diamètre.Advantageously, the depth P34 of each groove 34 is between 1% and 49% of the maximum diameter of the surface S32, in particular equal to 25% of this diameter.

Ainsi, contrairement au dispositif de EP-A-1 391 246 , le dispositif 30 est monobloc, ce qui facilite le montage.So unlike the device of EP-A-1,391,246 , the device 30 is monobloc, which facilitates assembly.

Le ratio entre la composante de vitesse radiale et la composante de vitesse axiale en sortie du dispositif 30 dépend du pas du ou des rainures 34. Notamment, la composante rotationnelle du vecteur vitesse du fluide en sortie du dispositif 30 est d'autant plus importante que le pas est faible. De préférence, le pas est choisi plus faible lorsque le fluide est visqueux. Dans l'exemple, la composante rotationnelle du vecteur vitesse en sortie du dispositif 30 est environ trois fois plus grande que la composante axiale.The ratio between the radial velocity component and the axial velocity component at the output of the device 30 depends on the pitch of the groove or grooves 34. In particular, the rotational component of the velocity vector of the fluid at the outlet of the device 30 is all the more important as the step is weak. Preferably, the pitch is chosen lower when the fluid is viscous. In the example, the rotational component of the velocity vector at the output of the device 30 is approximately three times greater than the axial component.

Toutefois, l'effet rotatif est atténué en sortie de buse pour les buses 2 de petit calibre, notamment pour les buses dont le calibre est inférieur à 0,9 mm, car le fluide subit une forte accélération axiale dans le canal 66 du fait de la réduction de la section de passage. Ainsi, la composante axiale du fluide en sortie de buse prédomine sur la composante radiale. En revanche, pour les buses de gros calibre, c'est-à-dire pour les buses dont le calibre est au moins égal à 0,9 mm, le fluide subit moins d'accélération axiale dans le canal d'éjection 66 et est éjecté avec une composante rotationnelle importante. Par conséquent, le dispositif 30 est plutôt destiné à être monté à l'intérieur des buses dont le calibre est d'au moins 0,9 mm.However, the rotary effect is attenuated at the nozzle outlet for the nozzles 2 of small caliber, especially for nozzles whose caliber is less than 0.9 mm, because the fluid undergoes a strong axial acceleration in the channel 66 because of the reduction of the passage section. Thus, the axial component of the nozzle outlet fluid predominates over the radial component. On the other hand, for the large nozzles, that is to say for the nozzles whose caliber is at least equal to 0.9 mm, the fluid undergoes less axial acceleration in the ejection channel 66 and is ejected with a large rotational component. Therefore, the device 30 is rather intended to be mounted inside the nozzles whose gauge is at least 0.9 mm.

Avantageusement, le dispositif 30 est enfoncé le plus profondément possible à l'intérieur du conduit 6, c'est-à-dire au plus près de l'orifice de sortie de la buse 2. Dans l'exemple, la distance d1 entre l'extrémité aval du dispositif 30 et l'orifice de sortie de la buse 2 est inférieure à 10 mm, notamment égale à 6 mm. Cela garantit que le fluide conserve sa rotation jusqu'à la sortie de la buse 2.Advantageously, the device 30 is driven as deep as possible inside the conduit 6, that is to say closer to the outlet orifice of the nozzle 2. In the example, the distance d1 between the downstream end of the device 30 and the outlet orifice of the nozzle 2 is less than 10 mm, in particular equal to 6 mm. This ensures that the fluid maintains its rotation until the outlet of the nozzle 2.

Avantageusement, le dispositif 30 comprend en outre un manche de préhension 36, qui est de diamètre réduit par rapport au corps 32. Le manche de préhension 36 s'étend axialement vers l'amont par rapport au corps 32. Il permet avantageusement le retrait manuel du dispositif 30 hors de la buse 2 pour des fins de nettoyage et/ou de remplacement. Le manche 36 s'étend avantageusement sur une longueur 136 au moins égale à 5 mm. Cette longueur minimale permet d'enfoncer manuellement le dispositif 30 le plus profondément possible à l'intérieur du conduit 6, c'est-à-dire au plus près de l'orifice de sortie de la buse 2.Advantageously, the device 30 further comprises a handle 36, which is of reduced diameter relative to the body 32. The handle 36 extends axially upstream relative to the body 32. It advantageously allows manual removal the device 30 out of the nozzle 2 for cleaning and / or replacement purposes. The handle 36 advantageously extends over a length 136 at least equal to 5 mm. This minimum length makes it possible to manually push the device 30 as deep as possible inside the duct 6, that is to say closer to the outlet orifice of the nozzle 2.

Dans l'exemple, le dispositif 30 délimite un alésage traversant 38 pour le passage du pointeau 22 de fermeture de la buse 2. L'alésage 38 s'étend axialement à travers le manche 36 et le corps 32. Le diamètre d38 de l'alésage 38 est sensiblement égal au diamètre du pointeau 22, de sorte que le produit ne passe pas à l'intérieur du corps 32. Toutefois, en variante non représentée, le diamètre de l'alésage 38 peut être choisi supérieur au diamètre du pointeau 22, si bien que le produit peut passer à l'intérieur du corps 32. Cela a pour avantage que le spray obtenu est plus facile à pulvériser et demande moins d'énergie (pneumatique par exemple) pour être pulvérisé.In the example, the device 30 delimits a through bore 38 for the passage of the needle 22 closing the nozzle 2. The bore 38 extends axially through the handle 36 and the body 32. The diameter d38 of the bore 38 is substantially equal to the diameter of the needle 22, so that the product does not pass inside the body 32. However, in a variant not shown, the diameter of the bore 38 may be chosen greater than the diameter of the needle 22 so that the product can pass inside the body 32. This has the advantage that the spray obtained is easier to spray and requires less energy (eg tire) to be sprayed.

Comme visible à la figure 8, le pistolet 1 comprend un raccord 40 d'alimentation en produit de revêtement. Ce raccord 40 est orienté perpendiculairement par rapport à l'axe de pulvérisation X-X' et s'étend notamment vers le bas à partir du corps 10 du pistolet 1. Il est destiné à être connecté à un tuyau d'alimentation en produit (non représenté). Le cheminement du produit de revêtement à partir du raccord 40 jusqu'à l'orifice de sortie de la buse 2 est représenté par les flèches F1 à la figure 8.As visible at figure 8 the gun 1 comprises a fitting 40 for supplying the coating product. This connector 40 is oriented perpendicular to the spray axis XX 'and extends in particular downwardly from the body 10 of the gun 1. It is intended to be connected to a product supply pipe (not shown ). The path of the coating product from the connection 40 to the outlet orifice of the nozzle 2 is represented by the arrows F1 at the figure 8 .

Indépendamment de ce qui précède, les figures 9 et 10 représentent un deuxième mode de réalisation de l'invention. Ce deuxième mode concerne un dispositif 30 de mise en rotation d'un fluide à l'intérieur d'une buse 2, ce dispositif comprenant un corps 32 délimitant au moins un trou hélicoïdale 33 pour le passage de tout ou partie du fluide. Ainsi, en comparaison avec le premier mode de réalisation, au moins une rainure 34 est remplacée par un conduit hélicoïdale, c'est-à-dire un trou 33 cheminant à travers le corps du dispositif 30 suivant une direction sensiblement hélicoïdale. Un tel dispositif peut par exemple être fabriqué grâce à l'impression 3D. En variante non représentée, le corps 32 délimite plusieurs trous hélicoïdaux 33 pour le passage de tout ou partie du fluideRegardless of the above, Figures 9 and 10 represent a second embodiment of the invention. This second mode relates to a device 30 for rotating a fluid inside a nozzle 2, this device comprising a body 32 defining at least one helical hole 33 for the passage of all or part of the fluid. Thus, in comparison with the first embodiment, at least one groove 34 is replaced by a helical conduit, i.e. a hole 33 running through the body of the device 30 in a substantially helical direction. Such a device can for example be manufactured through 3D printing. In variant not shown, the body 32 defines several helical holes 33 for the passage of all or part of the fluid

Selon des aspects avantageux, mais non obligatoires, ce dispositif 30 peut comprendre une ou plusieurs des caractéristiques suivantes, prises dans toute combinaison techniquement admissible :

  • Le corps 32 comprend une partie amont cylindrique et une partie aval tronconique, alors que chaque trou hélicoïdal 33 s'étend de manière continue à travers la partie cylindrique et à travers la partie tronconique du corps.
  • Une surface d'enveloppe S32 du corps 32 est à section circulaire ou elliptique.
  • La surface d'enveloppe S32 du corps 32 est au moins en partie cylindrique (voir surface S32a) et/ou tronconique (voir surface S32b).
  • La surface d'enveloppe S32 du corps comprend une partie amont cylindrique S32a et une partie aval tronconique S32b.
  • Le dispositif comprend en outre un manche de préhension 36, qui est de diamètre réduit par rapport au corps 32.
  • La longueur du manche 36 est supérieure ou égale à 5 mm.
  • Le dispositif délimite un alésage central traversant 38 pour le passage d'un pointeau 22 de fermeture de la buse 2.
  • Le corps 32 délimite au moins une rainure hélicoïdale pour le passage de tout ou partie du fluide.
  • Le dispositif est fabriqué par impression 3D.
According to advantageous but not mandatory aspects, this device 30 may include one or more of the following features, taken in any technically permissible combination:
  • The body 32 comprises a cylindrical upstream portion and a frustoconical downstream portion, while each helical hole 33 extends continuously through the cylindrical portion and through the frustoconical portion of the body.
  • An envelope surface S32 of the body 32 is circular or elliptical in section.
  • The envelope surface S32 of the body 32 is at least partly cylindrical (see surface S32a) and / or frustoconical (see surface S32b).
  • The envelope surface S32 of the body comprises a cylindrical upstream portion S32a and a frustoconical downstream portion S32b.
  • The device further comprises a handle 36, which is of reduced diameter relative to the body 32.
  • The length of the handle 36 is greater than or equal to 5 mm.
  • The device defines a central through bore 38 for the passage of a needle 22 closing the nozzle 2.
  • The body 32 defines at least one helical groove for the passage of all or part of the fluid.
  • The device is manufactured by 3D printing.

A titre de variante non représentée, le pointeau 22 et le dispositif 30 sont solidaires l'un avec l'autre. Notamment, le dispositif 30 peut être monté serré autour du pointeau 22 ou serti ou collé au pointeau 22. Le dispositif 30 et le pointeau 22 peuvent également être d'un seul tenant.As a variant not shown, the needle 22 and the device 30 are integral with each other. In particular, the device 30 can be mounted tight around the needle 22 or crimped or glued to the needle 22. The device 30 and the needle 22 can also be in one piece.

Selon une autre variante non représentée, la buse 2 et le dispositif 30 sont liés de manière indémontable. Notamment, la buse 2 et le dispositif 30 peuvent être deux pièces solidaires l'une de l'autre ou une seule et même pièce, fabriquée par exemple par impression 3D. La ou les rainures 34 du dispositif 30 sont nettoyées par injection de solvant en lieu et place du produit de revêtement.According to another variant not shown, the nozzle 2 and the device 30 are releasably connected. In particular, the nozzle 2 and the device 30 may be two pieces integral with one another or one and the same piece, manufactured for example by 3D printing. The groove or grooves 34 of the device 30 are cleaned by solvent injection in place of the coating product.

Selon une autre variante non représentée, le dispositif 30 est monté à l'intérieur d'un pistolet automatique, qui fonctionne sans action manuelle de la part d'un opérateur et qui est commandé à distance.According to another variant not shown, the device 30 is mounted inside an automatic pistol, which operates without manual action from an operator and is controlled remotely.

Selon une autre variante non représentée, la section et/ou la largeur des rainures 34 peut être différente d'une rainure à l'autre. La section et/ou la largeur de chaque rainure peut également varier suivant sa longueur. La section de chaque rainure 34 peut être de forme rectangulaire, triangulaire, elliptique, polygonale ou une forme inspirée de ces solutions (impression 3D). L'aire de la section peut aussi être variable. Elle est comprise entre 0,2 mm2 à 8 mm2. Selon une autre variante non représentée, le conduit 6 de la buse 2 comprend un tronçon d'éjection qui est évasé et de forme arrondie. Cela permet d'élargir davantage le spray en sortie de buse par effet Coanda. Cette solution pour élargir le jet est particulièrement adaptée pour les buses de petit calibre (inférieur à 0,9mm), pour lesquelles l'effet rotatif conféré par le dispositif 30 est moindre. Dans la pratique, ce type de buse procure un effet synergique avec le dispositif 30 lorsque le calibre est compris entre 0,7 et 1,2 mm.According to another variant not shown, the section and / or the width of the grooves 34 may be different from one groove to another. The section and / or width of each groove may also vary along its length. The section of each groove 34 may be rectangular, triangular, elliptical, polygonal or a shape inspired by these solutions (3D printing). The area of the section may also be variable. It is between 0.2 mm 2 to 8 mm 2 . According to another variant not shown, the duct 6 of the nozzle 2 comprises an ejection section which is flared and of rounded shape. This makes it possible to further widen the spray at the nozzle outlet by Coanda effect. This solution for expanding the jet is particularly suitable for small-caliber nozzles (less than 0.9 mm), for which the rotary effect imparted by the device 30 is less. In practice, this type of nozzle provides a synergistic effect with the device 30 when the size is between 0.7 and 1.2 mm.

Selon une autre variante non représentée, deux dispositifs de mise en rotation conformes à l'invention, c'est-à-dire comparables ou identiques au dispositif de mise en rotation 30, sont disposés en série l'un derrière l'autre à l'intérieur du conduit 6. Avantageusement, les deux dispositifs ont des pas inversés : chaque rainure d'un premier dispositif a un pas à droite, alors que chaque rainure du second dispositif a un pas à gauche, ou inversement. Cela permet de déstabiliser davantage l'écoulement fluide. Les deux dispositifs peuvent être réalisés d'un seul tenant.According to another variant not shown, two rotation devices according to the invention, that is to say comparable or identical to the rotating device 30, are arranged in series one behind the other at the same time. 6. Advantageously, the two devices have inverted steps: each groove of a first device has a step to the right, while each groove of the second device has a step to the left, or vice versa. This further destabilizes the fluid flow. Both devices can be made in one piece.

Selon une autre variante non représentée, le dispositif d'application comprend deux conduits d'alimentation en produit de revêtement séparés. II peut s'agir du même produit ou de deux produits différents à mélanger. Chaque conduit d'alimentation communique avec une rainure correspondante 34 du dispositif 30, lequel comporte alors au moins deux rainures. Les produits circulant dans les deux conduits séparés sont mélangés en aval du dispositif 30. Une partie alors du fluide circulant à l'intérieur de la buse passe donc à travers une rainure. De manière plus générale, chaque rainure du dispositif communique avec un conduit d'alimentation en produit de revêtement séparé. Le nombre de conduits d'alimentation en produit peut donc être supérieur à 2.According to another variant not shown, the application device comprises two separate coating product supply ducts. It can be the same product or two different products to mix. Each supply duct communicates with a corresponding groove 34 of the device 30, which then comprises at least two grooves. The products flowing in the two separate ducts are mixed downstream of the device 30. A portion of the fluid flowing inside the nozzle therefore passes through a groove. More generally, each groove of the device communicates with a supply duct of separate coating product. The number of product supply ducts may therefore be greater than 2.

Les caractéristiques des variantes et du mode de réalisation envisagés ci-dessus peuvent être combinées entre elles pour générer de nouveaux modes de réalisation de l'invention.The characteristics of the variants and of the embodiment envisaged above can be combined with each other to generate new embodiments of the invention.

Claims (14)

Dispositif (30) de mise en rotation d'un fluide à l'intérieur d'une buse (2), ce dispositif comprenant un corps (32) délimitant au moins une rainure hélicoïdale (34) et/ou un trou hélicoïdal (33) pour le passage de tout ou partie du fluide.Device (30) for rotating a fluid inside a nozzle (2), this device comprising a body (32) delimiting at least one helical groove (34) and / or a helical hole (33) for the passage of all or part of the fluid. Dispositif selon la revendication 1, caractérisée en ce qu'une surface d'enveloppe (S32) du corps est à section circulaire ou elliptique.Device according to claim 1, characterized in that an envelope surface (S32) of the body is of circular or elliptical section. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'une surface d'enveloppe (S32) du corps est au moins en partie cylindrique (S32a) et/ou tronconique (S32b).Device according to claim 1 or 2, characterized in that an envelope surface (S32) of the body is at least partly cylindrical (S32a) and / or frustoconical (S32b). Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'une surface d'enveloppe (S32) du corps comprend une partie amont cylindrique (S32a) et une partie aval tronconique (S32b).Device according to one of the preceding claims, characterized in that an envelope surface (S32) of the body comprises a cylindrical upstream portion (S32a) and a frustoconical downstream portion (S32b). Dispositif selon l'une des revendications précédentes, caractérisé en ce que le dispositif comprend en outre un manche de préhension (36), qui est de diamètre réduit par rapport au corps (32).Device according to one of the preceding claims, characterized in that the device further comprises a handle (36), which is of reduced diameter relative to the body (32). Dispositif selon la revendication 5, caractérisé en ce que la longueur (I36) du manche (36) est supérieure ou égale à 5 mm.Device according to claim 5, characterized in that the length (I36) of the handle (36) is greater than or equal to 5 mm. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le dispositif délimite un alésage central traversant (38) pour le passage d'un pointeau (22) de fermeture de la buse (2).Device according to one of the preceding claims, characterized in that the device defines a central bore through (38) for the passage of a needle (22) closing the nozzle (2). Dispositif selon l'une des revendications précédentes, caractérisé en ce que le dispositif est fabriqué par impression 3D.Device according to one of the preceding claims, characterized in that the device is manufactured by 3D printing. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le corps comprend une partie amont cylindrique et une partie aval tronconique et en ce que chaque rainure hélicoïdale (34) s'étend de manière continue à la surface de la partie amont cylindrique et à la surface de la partie aval tronconique.Device according to one of the preceding claims, characterized in that the body comprises a cylindrical upstream part and a frustoconical downstream part and in that each helical groove (34) extends continuously over the surface of the cylindrical upstream part and on the surface of the frustoconical downstream part. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le corps comprend une partie amont cylindrique et une partie aval tronconique et en ce que chaque trou hélicoïdal (33) s'étend de manière continue à travers la partie cylindrique et à travers la partie tronconique du corps (32).Device according to one of the preceding claims, characterized in that the body comprises a cylindrical upstream part and a frustoconical downstream part and in that each helical hole (33) extends continuously through the cylindrical part and through the frustoconical part of the body (32). Ensemble comprenant un dispositif selon l'une des revendications précédentes et une pièce parmi une buse et un pointeau de fermeture de la buse, caractérisé en ce que le dispositif et ladite pièce sont solidaires l'un de l'autre ou monobloc.Assembly comprising a device according to one of the preceding claims and one of a nozzle and a nozzle closing needle, characterized in that the device and said piece are integral with each other or monobloc. Dispositif d'application, tel qu'un pistolet de pulvérisation manuel ou automatique, comprenant un ensemble selon la revendication 11 ou un dispositif selon l'une des revendications 1 à 10.Application device, such as a manual or automatic spray gun, comprising an assembly according to claim 11 or a device according to one of claims 1 to 10. Dispositif d'application selon la revendication précédente, caractérisé en ce que le dispositif est immobilisé à l'intérieur d'un conduit (6) de passage de fluide délimité par une buse (2) et en ce que le conduit (6) définit un logement (60, 62) de réception du dispositif (30) qui est de forme complémentaire à celle d'une surface d'enveloppe (S32) du corps (32) du dispositif.Application device according to the preceding claim, characterized in that the device is immobilized inside a conduit (6) fluid passage delimited by a nozzle (2) and in that the conduit (6) defines a receiving housing (60, 62) of the device (30) which is of complementary shape to that of an envelope surface (S32) of the device body (32). Dispositif d'application selon la revendication 12 ou 13, caractérisé en ce que le dispositif comprend une buse (2) qui délimite un conduit (6) de passage de fluide et en ce que le conduit (6) comprend un tronçon d'éjection évasé et de forme arrondie.Application device according to claim 12 or 13, characterized in that the device comprises a nozzle (2) which delimits a fluid passage duct (6) and in that the duct (6) comprises a flaring ejection section and rounded shape.
EP17190768.6A 2016-09-14 2017-09-13 Coating device Active EP3296022B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1658549A FR3055818A1 (en) 2016-09-14 2016-09-14 DEVICE FOR ROTATING A FLUID WITHIN A NOZZLE, ASSEMBLY COMPRISING SUCH DEVICE AND APPLICATION DEVICE

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EP3296022A1 true EP3296022A1 (en) 2018-03-21
EP3296022B1 EP3296022B1 (en) 2021-01-13

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JP (1) JP6959076B2 (en)
KR (1) KR102512019B1 (en)
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BR (1) BR102017017642A2 (en)
CA (1) CA2976569A1 (en)
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CN108325767A (en) * 2018-04-08 2018-07-27 南通凯顺生物科技有限公司 A kind of production technology of rotatable spray appliance
CN108906353B (en) * 2018-07-27 2019-10-29 江苏省中跃涂装设备有限公司 A kind of even application discharge port for spray robot
CN109228340A (en) * 2018-10-29 2019-01-18 共享智能铸造产业创新中心有限公司 A kind of print head applied to FDM printer
USD900966S1 (en) * 2019-03-06 2020-11-03 Krimelte Oü Nozzle for polyurethane foam gun
CN112108274A (en) * 2019-06-21 2020-12-22 工程与工业解决方案集团有限公司 Improved pick-up flush sprayer for shear cylinder
CN110193285B (en) * 2019-07-12 2024-06-21 中电华创(苏州)电力技术研究有限公司 Ammonia injection mixed flow device of SCR denitration system
KR102494943B1 (en) * 2021-07-16 2023-02-06 주식회사 에스엠뿌레 Sprayer
CN113617551B (en) * 2021-10-09 2021-12-07 寿光市博达机械制造有限公司 Vortex type urea nozzle

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KR20180030392A (en) 2018-03-22
RU2017131920A (en) 2019-03-14
US11097294B2 (en) 2021-08-24
CN107812624A (en) 2018-03-20
FR3055818A1 (en) 2018-03-16
ES2851723T3 (en) 2021-09-08
RU2743569C2 (en) 2021-02-19
EP3296022B1 (en) 2021-01-13
KR102512019B1 (en) 2023-03-20
JP2018043235A (en) 2018-03-22
RU2017131920A3 (en) 2020-09-21
BR102017017642A2 (en) 2018-04-03
JP6959076B2 (en) 2021-11-02
US20180071757A1 (en) 2018-03-15
CA2976569A1 (en) 2018-03-14

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