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EP2328689B2 - Rotary spray device and method of spraying coating product using such a rotary spray device - Google Patents

Rotary spray device and method of spraying coating product using such a rotary spray device Download PDF

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Publication number
EP2328689B2
EP2328689B2 EP09753160.2A EP09753160A EP2328689B2 EP 2328689 B2 EP2328689 B2 EP 2328689B2 EP 09753160 A EP09753160 A EP 09753160A EP 2328689 B2 EP2328689 B2 EP 2328689B2
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EP
European Patent Office
Prior art keywords
primary
orifices
axis
rotation
contour
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Application number
EP09753160.2A
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German (de)
French (fr)
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EP2328689A1 (en
EP2328689B1 (en
Inventor
Sylvain Perinet
Franck Gerstch
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Sames Kremlin SAS
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Sames Kremlin SAS
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Priority to PL09753160.2T priority Critical patent/PL2328689T5/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member
    • B05B3/1092—Means for supplying 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
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member
    • B05B3/1007—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member characterised by the rotating member
    • B05B3/1014—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/14—Paint sprayers

Definitions

  • the present invention relates to a rotating coating product projector.
  • the present invention also relates to a coating product spraying method which uses such a rotary sprayer.
  • a rotary sprayer for spraying coating product comprises a spraying member rotating at high speed under the effect of rotary drive means, such as a compressed air turbine.
  • Such a spray member generally has the shape of a bowl with symmetry of revolution and it comprises at least one spray edge capable of forming a jet of coating product.
  • the rotary sprayer also comprises a fixed body housing the means for driving in rotation as well as means for supplying the spray member with coating product.
  • the jet of coating product sprayed by the edge of the rotating member has a generally conical shape which depends on parameters such as the speed of rotation of the bowl and the flow rate of coating product.
  • the rotary projectors of the prior art are generally equipped with several primary orifices formed in the body of the projector and arranged on a circle which is centered on the axis of symmetry of the bowl and which is located on the outer rim of the bowl.
  • the primary orifices are intended to emit jets of primary air together forming air for shaping the jet of product, this air for shaping being sometimes referred to as “skirt air”.
  • JP-A-8071455 describes a rotary sprayer provided with primary orifices intended to emit jets of primary air to conform the jet of product.
  • Each primary air jet is inclined with respect to the axis of rotation of the bowl in a primary direction having an axial component and an orthoradial or circumferential component.
  • the primary air jets thus generate a swirling flow of air around the outer periphery of the bowl and the jet of coating product.
  • This swirling air flow sometimes referred to as a "vortex" makes it possible, in particular by adjusting its flow rate, to conform the jet of product sprayed by the edge according to the desired application.
  • the rotating projector body shown in figure 6 of JP-A-8071455 is further provided with several secondary orifices also arranged on the outer periphery of the bowl and on the same circle as the primary orifices and offset from the latter.
  • Each jet of secondary air issuing from one of these secondary orifices is inclined relative to the axis of rotation in a secondary direction having an axial component and a radial component.
  • the secondary air jets are intended to obtain a uniform deposited paint film.
  • the direction of each jet of secondary air is therefore determined so as to prevent this jet of secondary air from striking the rear surface of the bowl.
  • an object coated by means of such a rotating projector presents impacts whose profiles are sometimes irregular and generally not very robust.
  • the robustness of an impact from a rotating projector of a coating product corresponds substantially to the regularity of a curve representing, as a function of a given parameter such as the skirt air flow, the width of the zone of median or upper deposited thickness, considered along a direction perpendicular to the direction of the relative movement between the rotary projector and the object to be coated.
  • the deposition efficiency of such a rotary projector is relatively limited.
  • the deposition efficiency also called transfer efficiency, is the ratio of the quantity of coating product deposited on the object to be coated to the quantity of coating product projected by means of the rotary projector.
  • JP-A-8084941 describes a rotary sprayer provided with primary orifices and secondary orifices to respectively emit primary air jets and secondary air jets.
  • the primary air jets and the secondary air jets are oriented in respective parallel or diverging directions, which produces marginal and low-volume overlaps between adjacent jets.
  • Such a rotary projector therefore also has the disadvantages mentioned above.
  • the present invention aims in particular to remedy these drawbacks by proposing a rotating coating product sprayer making it possible to obtain relatively high deposition yields as well as good robustness of the impacts of the coating product on the objects to be coated.
  • each primary direction and of each secondary direction induce the formation of combined jets each resulting from the intersection of at least one primary air jet and at least one associated secondary air jet, the intersection region being located upstream of the edge, and the ratio between the diameter of the edge and the diameter of the circle being between 0.65 and 1 and of preference equal to 0.95.
  • the subject of the present invention is a process for spraying coating product, using a rotary sprayer as described above, with a total air flow of between 100 NL/min and 1000 NL/min. , preferably between 300 NL/min and 800 NL/min and comprising from 25% to 75%, preferably 33%, of flow rate of the primary air jets and from 75% to 25%, preferably 67%, of flow rate secondary air jets.
  • the subject of the invention is a coating product spraying installation, which comprises at least one rotary sprayer as described above.
  • the figure 1 shows a rotary projector P for the projection of coating product comprising a spray member 1, hereinafter referred to as a bowl.
  • the bowl 1 is partially housed within a body 2.
  • the bowl 1 is shown in a spraying position where it is rotated at high speed around an axis X 1 by drive means, not shown.
  • the axis X 1 therefore constitutes the axis of rotation of the bowl 1.
  • the body 2 is fixed, that is to say it does not rotate around the axis X 1 .
  • the body 2 can be mounted on a support, not shown, such as a multi-axis robot arm.
  • a distributor 3 is secured to the upstream part of the bowl 1 to channel and distribute the coating product.
  • the speed of rotation of bowl 1 under load that is to say when it is spraying product, can be between 30,000 rpm and 70,000 rpm.
  • the bowl 1 has a symmetry of revolution around the axis X 1 .
  • the bowl 1 has a distribution surface 11 on which the coating product spreads, under the effect of centrifugal force, up to a spray edge 12 where it is micronized into fine droplets. All of the droplets form a jet of product, not shown, which leaves the bowl 1 and goes towards an object to be coated, not shown, on which it produces an impact.
  • the outer rear surface 13 of the bowl that is to say the surface which is not turned towards its axis of symmetry X 1 , is turned towards the body 2.
  • the body 2 has primary orifices 4 and secondary orifices 6.
  • the primary orifices 4 are arranged on a primary contour C 4 which surrounds the axis X 1 .
  • the secondary orifices 6 are arranged on a secondary contour C 6 which surrounds the axis X 1 .
  • the primary contour C 4 and the secondary contour C 6 are arranged in a common plane P 46 .
  • the common plane P 46 is perpendicular to the axis X 1 .
  • the plane P 46 is located in the downstream part of the body 2. Insofar as the body 2 has a symmetry of revolution around the axis X 1 , the common plane P 46 is materialized by a plane ring comprising the primary contours C 4 and secondary C 6 .
  • upstream and downstream refer to the direction of flow of the product from the base of the rotary projector P, located to the right of the figure 1 , to ridge 12, located to the left of the figure 1 .
  • the primary contour C 4 and the secondary contour C 6 each has a circular shape centered on the axis X 1 .
  • the primary contour C 4 and the contour C 6 coincide in a circle C which is therefore centered on the axis X 1 and on which the primary orifices 4 and the secondary orifices 6 are arranged.
  • the primary orifices 4 and the secondary orifices 6 belong to the body 2.
  • Edge 12 generally has the shape of a circle of diameter D 12 centered on axis X 1 . Serrations are made between the distribution surface 11 and the edge 12, some of which are shown in picture 2 with the reference 14, to improve the control of the size of the micronized droplets at the level of the edge 12.
  • the edge 12 is at an axial distance L 1 from the circle C, therefore from the primary contour C 4 or from the secondary contour ( C 6 ) is here 10 mm. In practice, the distance L 1 may be between 5 mm and 30 mm.
  • the distance L 1 represents the protrusion of the bowl 1 from the body 2.
  • the adjective “axial” qualifies a distance or, more generally, an entity which extends along the direction of the axis X 1 .
  • the diameter D of the circle C is here equal to 52.6 mm for a bowl 1 with a diameter equal to 50 mm. In practice, the diameter D can be between 50 mm and 77 mm for such a bowl.
  • the ratio between the diameter D 12 of the edge 12 and the diameter D of the circle C is equal to 0.95. According to the invention, this ratio must be between 0.65 and 1.
  • the primary orifices 4 and the secondary orifices 6 are intended to respectively emit primary air jets J 4 and secondary air jets J 6 which are represented on the figure 1 and 8 by their respective directions, primary X 4 and secondary X 6 .
  • primary direction is meant the direction of ejection of a primary jet J 4 .
  • secondary direction is meant the direction of ejection of a jet of secondary air J 6 .
  • each primary air jet J 4 is inclined on the axis X 1 in a primary direction X 4 .
  • Each primary direction X 4 extends obliquely relative to the axis X 1 and relative to the common plane P 46 .
  • each primary direction X 4 has non-zero components along the three directions of a Cartesian coordinate system whose origin merges with the corresponding primary orifice 4, namely the direction of the axis X 1 , a radial direction and an orthoradial direction, that is to say circumferential or tangential.
  • Each primary direction X 4 and the bowl 1 are separate, so that each primary air jet J 4 can freely cross the region where the edge 12 is located.
  • the primary air jets J 4 do not hit the outer rear surface 13 of the bowl 1.
  • the primary jets J 4 together generate a swirling air flow, called "vortex air", which is capable to influence the shape of the spray of coating material.
  • vortex air a swirling air flow, called "vortex air"
  • Each primary direction X 4 is such that the corresponding primary air jet J 4 flows at a radial distance r 4 from edge 12 equal to 5 mm.
  • the distance r 4 is non-zero and less than 25 mm.
  • the distance r 4 depends in particular on the axial distance L 1 .
  • Each secondary air jet J 6 is inclined with respect to the axis X 1 in a secondary direction X 6 which extends obliquely with respect to the axis X 1 .
  • each direction secondary X 6 is such that the corresponding secondary air jet J 6 strikes the outer rear surface 13 of the bowl 1, as is apparent from the picture 2 .
  • each secondary direction X 6 is secant to the surface defining the bowl 1 and it “intersects” the bowl 1 at an axial distance L 136 from the edge 12 equal to 3.5 mm.
  • the distance L 136 can be between 0 mm and 25 mm.
  • each secondary direction X 6 extends in a plane comprising the axis X 1 (meridian plane).
  • the secondary directions X 6 converge towards a vertex S 6 which is located on the axis X 1 .
  • the secondary direction X 6 is transverse to the axis of rotation X 1 .
  • Each secondary direction X 6 can thus be assimilated to a generatrix of a cone whose vertex S 6 belongs to the axis X 1 .
  • the secondary directions X 6 may not completely converge, but rather converge in a slightly extended area close to the axis X 1 .
  • the secondary directions X 6 can be disjoint, that is to say not confluent nor converge, like the primary directions X 4 in the example of the figures 1 to 8 .
  • the set of primary directions X 4 of the primary air jets J 4 and the set of secondary directions X 6 of the air jets J 6 respectively exhibit symmetry with respect to the axis X 1 .
  • other orientations of the primary and secondary directions are possible, in particular asymmetrical orientations.
  • the primary orifices 4 are arranged alternately with the secondary orifices 6. As shown by the figures 1 to 8 , the primary 4 and secondary 6 orifices are distributed uniformly on the circle C, so that two successive primary orifices 4 or two successive secondary orifices 6 are separated by the same angle B equal to 9° which is visible at the figure 6 . In practice, this angle B can be between 6° and 18°.
  • a primary orifice 4 and a neighboring secondary orifice 6 are spaced apart by an angle A equal to 6.7°, which is visible at the figure 6 , that is to say half of the angle B separating for example two successive primary orifices 4.
  • the angular difference A between a primary orifice 4 and a secondary orifice 6 can be between 3° and 12°.
  • a primary orifice 4 and an adjacent secondary orifice 6 are separated by a distance c 46 equal to 1 mm.
  • the distance c 46 can be between 0 mm and 10 mm. As described below, such a distance c 46 makes it possible to add the primary jets J 4 and secondary jets J 6 .
  • the number and distribution of the primary 4 and secondary 6 orifices is determined according to the precision sought for controlling the shape of the jet of product and the regularity desired for the impact surface. Thus, the more orifices 4 and 6 there are, the more regular the impact surface.
  • the body 2 comprises approximately forty primary orifices 4 and approximately forty secondary orifices 6. In practice, the body 2 may comprise between twenty and sixty primary orifices 4 and between twenty and sixty secondary orifices 6. Alternatively, primary orifices and secondary orifices in different numbers.
  • the primary 4 and secondary 6 orifices have respective diameters d 4 and d 6 , which are visible at figure 6 , both being 0.8 mm.
  • the diameters d 4 and d 6 of the primary 4 and secondary 6 orifices can be between 0.4 mm and 1.2 mm. In particular, the diameters d 4 and d 6 can be different from each other.
  • each primary air jet J 4 and each secondary air jet J 6 bursts into a cone with a relatively small apex half-angle of approximately 10°.
  • the primary directions J 4 and secondary J 6 are determined here respectively by the orientations of primary channels 40 and secondary channels 60 defined in the body 2.
  • the primary directions X 4 and secondary X 6 correspond to the direction of the respective axes of the primary channels 40 and secondaries 60.
  • the channels 40 and 60 are straight and open respectively on the primary 4 and secondary 6 orifices. Upstream, the channels 40 and 60 are connected to two independent sources of compressed air supply described below to form the jets J 4 and J 6 .
  • the primary 40 and secondary 60 channels extend straight through an outer jacket 22 which extends a cover 20 defining the outer envelope of the body 2.
  • the channels 40 and 60 are made by means of drilling operations according to the appropriate angles.
  • the primary channels 40 are connected upstream, to a primary chamber which is common to them and which is itself connected to a source of compressed air, not shown.
  • the secondary channels 60 are connected to a secondary chamber which is common to them and which is connected to a source of compressed air, not shown, and independent of the source supplying the primary channels 40.
  • the primary and secondary chambers are here formed between the outer jacket 22 and an inner jacket 24, and they are separated by an O-ring seal.
  • the adjective “internal” designates here an object close to the axis of rotation X 1
  • the adjective “external” designates an object which is further from it.
  • the sleeves 22 and 24 generally have a symmetry of revolution around the axis X 1 .
  • the primary channels 40 and/or secondary 60 can be defined by gaps formed between the outer 22 and inner 24 liners. These gaps can in this case be made by machining notches on one and/or the other of the surfaces facing the inner 24 and outer liners 22.
  • the geometry of the primary 4 and secondary 6 orifices induces the formation of combined jets J 46 which each result from the intersection of a primary air jet J 4 and a secondary air jet J 6 . More precisely, the respective orientations of each primary direction X 4 and of each secondary direction X 6 , in particular with respect to the axis X 1 , as well as the respective positions of each primary orifice 4 and of each secondary orifice 6 induce, and therefore are determined for the formation of combined jets J 46 , as shown by the figures 5 to 8 .
  • intersection region R 46 corresponds to the volume where a primary air jet J 4 meets the associated secondary air jet J 6 , which generates a combined jet J 46 .
  • each combined air jet J 46 generally has the shape of a cone widening from the intersection region R 46 to downstream of the edge 12.
  • a primary direction X 4 and an associated secondary direction X 6 preferably meet at a meeting point 46 belonging to the intersection region R 46 .
  • the intersection, or the interaction, of the primary air jet and of the corresponding secondary air jet is maximal.
  • the flow rate of each combined air jet corresponds substantially to the addition of the flow rates of the primary air jet and of the secondary air jet which generated it. This makes it possible to optimize the yield of deposition and the robustness of the impacts of the coating product on the objects to be coated.
  • the meeting point 46 is located at an axial distance L 46 from the common plane P 46 of between 1 time and 2 times the largest dimension of the primary 4 or secondary 6 orifices. This largest dimension is taken in the common plane P 46 . In this case, it is either the diameter d 4 or the diameter d 6 , since the primary 4 and secondary 6 orifices have the same diameter. In practice, the axial distance L 46 between the meeting point 46 and the common plane P 46 is between 0.5 times and 30 times this largest dimension.
  • Such an axial distance L 46 makes it possible to achieve a relatively homogeneous addition of the flows of the primary air jet J 4 and of the secondary air jet J 6 , therefore to limit the irregularities of the combined jet J 46 at and downstream of the edge 12.
  • each combined jet J 46 has, in the plane of the edge 12, a section which is generally in the shape of an ellipse E 46 truncated by the edge 12.
  • the flow of the additional jet or combined jet J 46 is in fact deflected by the outer rear surface 13 of the bowl 1.
  • the major axis X 46 of the ellipse E 46 is inclined, at an angle A 46 , with respect to a direction T 12 locally tangent to the edge 12.
  • the angle A 46 is also determined by the respective orientations of each primary direction X 4 and of each secondary direction X 6 , as well as by the respective positions of each primary orifice 4 and of each secondary orifice 6.
  • the angle A 46 is here equal to 50°. In practice, the angle A 46 can be between 20° and 70°, preferably between 35° and 55°. This inclination of the ellipse E 46 , therefore of the combined jet J 46 , makes it possible to make the air velocities uniform in the flows of combined jets J 46 which flow around the edge 12, as described below. afterwards in relation to figures 7 and 8 .
  • the primary orifices 4 and the secondary orifices 6 are positioned respectively on the primary contour C 4 and on the secondary contour C 6 , that is to say here on the circle C, so as to partly mix two combined jets J 46 neighbors.
  • each lateral region of a combined jet J 46 considered along the direction T 12 , defined by a tangent to the edge 12, mixes with a lateral region of the neighboring combined jet J 46 .
  • the volumes of F 46 mixture are represented by their hatched section on the figure 8 .
  • Such a mixture makes it possible to ensure a relatively good uniformity of the air speeds at the periphery of the edge 12, not only if one considers a speed profile along the circumferential direction T 12 , but also if one considers a velocity profile in a radial direction R 12 .
  • the respective positions of the primary 4 and secondary 6 orifices, as well as the respective orientations of the primary X 4 and secondary X 6 directions make it possible to produce an isotropic field of air speeds all around the bowl 1. Consequently , the airflows passing through two elementary sections of identical area but of any position within the envelope formed by the juxtaposition of the combined jets J 46 are substantially the same. All the droplets micronized by the edge 12 are thus subjected to uniform and constant airflow forces.
  • the rotary sprayer P can be implemented according to a coating product spraying method according to the invention.
  • the flow rate of the primary air jets J 4 and the flow rate of the secondary air jets J 6 represent respectively 33% and 67% of the total air flow, which can be between 100 NL/min and 1000 NL/ min, preferably between 300 NL/min and 800 NL/min.
  • the flow rate of the primary air jets J 4 can represent from 25% to 75% of the total air flow and the secondary air flow J 6 can represent, additionally, from 75% to 25%.
  • the primary and secondary contours can be arranged in two separate planes.
  • the primary and secondary contours can be arranged in two distinct planes on a generally frustoconical surface which extends in the downstream part of the fixed body and around the axis of rotation of the bowl. More generally, the primary contour and/or the secondary contour may not be flat.
  • the fixed body of the rotary headlamp may comprise additional orifices intended to emit air jets oriented differently from the primary and secondary air jets.
  • the fixed body may comprise additional orifices which are positioned differently from the primary and secondary orifices.
  • additional orifices are not necessarily configured to produce combined jets, but they may perform other functions.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)

Description

La présente invention concerne un projecteur rotatif de produit de revêtement. La présente invention concerne également un procédé de projection de produit de revêtement qui met en oeuvre un tel projecteur rotatif.The present invention relates to a rotating coating product projector. The present invention also relates to a coating product spraying method which uses such a rotary sprayer.

La pulvérisation conventionnelle au moyen de projecteurs rotatifs est utilisée pour appliquer sur des objets à revêtir, tels que des carrosseries de véhicules automobiles, un apprêt, une couche de base et/ou un vernis. Un projecteur rotatif de projection de produit de revêtement comporte un organe de pulvérisation tournant à haute vitesse sous l'effet de moyens d'entraînement en rotation, tels qu'une turbine à air comprimé.Conventional spraying by means of rotary projectors is used to apply to objects to be coated, such as motor vehicle bodies, a primer, a base coat and/or a clearcoat. A rotary sprayer for spraying coating product comprises a spraying member rotating at high speed under the effect of rotary drive means, such as a compressed air turbine.

Un tel organe de pulvérisation présente généralement la forme d'un bol à symétrie de révolution et il comporte au moins une arête de pulvérisation apte à former un jet de produit de revêtement. Le projecteur rotatif comporte également un corps fixe logeant les moyens d'entraînement en rotation ainsi que des moyens d'alimentation de l'organe de pulvérisation en produit de revêtement.Such a spray member generally has the shape of a bowl with symmetry of revolution and it comprises at least one spray edge capable of forming a jet of coating product. The rotary sprayer also comprises a fixed body housing the means for driving in rotation as well as means for supplying the spray member with coating product.

Le jet de produit de revêtement pulvérisé par l'arête de l'organe tournant présente une forme globalement conique qui dépend de paramètres tels que la vitesse de rotation du bol et le débit de produit de revêtement. Pour contrôler la forme de ce jet de produit, les projecteurs rotatifs de l'art antérieur sont généralement équipés de plusieurs orifices primaires formés dans le corps du projecteur et disposés sur un cercle qui est centré sur l'axe de symétrie du bol et qui est situé sur le pourtour extérieur du bol. Les orifices primaires sont destinés à émettre des jets d'air primaire formant ensemble un air de conformation du jet de produit, cet air de conformation étant parfois dénommé « air de jupe ».The jet of coating product sprayed by the edge of the rotating member has a generally conical shape which depends on parameters such as the speed of rotation of the bowl and the flow rate of coating product. To control the shape of this jet of product, the rotary projectors of the prior art are generally equipped with several primary orifices formed in the body of the projector and arranged on a circle which is centered on the axis of symmetry of the bowl and which is located on the outer rim of the bowl. The primary orifices are intended to emit jets of primary air together forming air for shaping the jet of product, this air for shaping being sometimes referred to as “skirt air”.

JP-A-8 071 455 décrit un projecteur rotatif muni d'orifices primaires destinés à émettre des jets d'air primaire pour conformer le jet de produit. Chaque jet d'air primaire est incliné par rapport à l'axe de rotation du bol selon une direction primaire présentant une composante axiale et une composante orthoradiale ou circonférentielle. Les jets d'air primaire génèrent ainsi un flux d'air tourbillonnant autour du pourtour extérieur du bol et du jet de produit de revêtement. Ce flux d'air tourbillonnant, parfois qualifié de « vortex », permet, notamment par le réglage de son débit, de conformer le jet de produit pulvérisé par l'arête en fonction de l'application recherchée. JP-A-8071455 describes a rotary sprayer provided with primary orifices intended to emit jets of primary air to conform the jet of product. Each primary air jet is inclined with respect to the axis of rotation of the bowl in a primary direction having an axial component and an orthoradial or circumferential component. The primary air jets thus generate a swirling flow of air around the outer periphery of the bowl and the jet of coating product. This swirling air flow, sometimes referred to as a "vortex", makes it possible, in particular by adjusting its flow rate, to conform the jet of product sprayed by the edge according to the desired application.

Le corps du projecteur rotatif illustré à la figure 6 de JP-A-8 071 455 est en outre pourvu de plusieurs orifices secondaires disposés aussi sur le pourtour extérieur du bol et sur le même cercle que les orifices primaires et de façon décalée par rapport à ces derniers. Chaque jet d'air secondaire issu de l'un de ces orifices secondaires est incliné par rapport à l'axe de rotation selon une direction secondaire présentant une composante axiale et une composante radiale. Ces composantes sont déterminées de manière à injecter des flux d'air autour du bol permettant de réduire la dépression causée en aval du bol par la rotation du bol à haute vitesse.The rotating projector body shown in figure 6 of JP-A-8071455 is further provided with several secondary orifices also arranged on the outer periphery of the bowl and on the same circle as the primary orifices and offset from the latter. Each jet of secondary air issuing from one of these secondary orifices is inclined relative to the axis of rotation in a secondary direction having an axial component and a radial component. These components are determined so as to inject air flows around the bowl to reduce the vacuum caused downstream of the bowl by the rotation of the bowl at high speed.

Ainsi, les jets d'air secondaire sont destinés à obtenir un film de peinture déposé uniforme. Dans ce but, il est nécessaire que les jets d'air secondaire parviennent directement dans la zone de dépression située face au bol et en aval de celui-ci. La direction de chaque jet d'air secondaire est donc déterminée de manière à éviter que ce jet d'air secondaire ne vienne frapper la surface arrière du bol.Thus, the secondary air jets are intended to obtain a uniform deposited paint film. For this purpose, it is necessary for the jets of secondary air to arrive directly in the depression zone located opposite the bowl and downstream of the latter. The direction of each jet of secondary air is therefore determined so as to prevent this jet of secondary air from striking the rear surface of the bowl.

Toutefois, de tels flux d'air secondaire requièrent des réglages délicats pour éviter de détériorer la forme du jet de produit de revêtement. De plus, des jets d'air secondaire ainsi inclinés ne permettent pas de régler la forme du jet de produit ni, par conséquent, la surface d'impact des gouttelettes pulvérisées sur l'objet à revêtir.However, such secondary air flows require delicate adjustments to avoid damaging the shape of the coating product jet. In addition, jets of secondary air thus inclined do not make it possible to adjust the shape of the jet of product nor, consequently, the impact surface of the droplets sprayed on the object to be coated.

En outre, un tel projecteur rotatif induit des vitesses d'air de jupe et d'air de vortex relativement élevées, ce qui risque de dégrader, de manière qualitative et de manière quantitative, l'application du produit de revêtement sur l'objet à revêtir.In addition, such a rotary projector induces relatively high skirt air and vortex air velocities, which risks degrading, qualitatively and quantitatively, the application of the coating product on the object to be put on.

De manière qualitative d'une part, un objet revêtu au moyen d'un tel projecteur rotatif présente des impacts dont les profils sont parfois irréguliers et généralement peu robustes. La robustesse d'un impact issu d'un projecteur rotatif d'un produit de revêtement correspond sensiblement à la régularité d'une courbe représentant, en fonction d'un paramètre déterminé tel que le débit d'air de jupe, la largeur de la zone d'épaisseur déposée médiane ou supérieure, considérée suivant une direction perpendiculaire à la direction du mouvement relatif entre le projecteur rotatif et l'objet à revêtir.Qualitatively, on the one hand, an object coated by means of such a rotating projector presents impacts whose profiles are sometimes irregular and generally not very robust. The robustness of an impact from a rotating projector of a coating product corresponds substantially to the regularity of a curve representing, as a function of a given parameter such as the skirt air flow, the width of the zone of median or upper deposited thickness, considered along a direction perpendicular to the direction of the relative movement between the rotary projector and the object to be coated.

De manière quantitative d'autre part, le rendement de dépôt d'un tel projecteur rotatif est relativement limité. Le rendement de dépôt, aussi dénommé efficacité de transfert, est le rapport de la quantité de produit de revêtement déposé sur l'objet à revêtir sur la quantité de produit de revêtement projeté au moyen du projecteur rotatif.Quantitatively on the other hand, the deposition efficiency of such a rotary projector is relatively limited. The deposition efficiency, also called transfer efficiency, is the ratio of the quantity of coating product deposited on the object to be coated to the quantity of coating product projected by means of the rotary projector.

JP-A-8 084 941 décrit un projecteur rotatif muni d'orifices primaires et d'orifices secondaires pour émettre respectivement des jets d'air primaire et des jets d'air secondaire. Les jets d'air primaire et les jets d'air secondaire sont orientés suivant des directions respectives parallèles ou divergentes, ce qui produit des recoupements marginaux et de faible volume entre jets adjacents. Un tel projecteur rotatif présente donc aussi les inconvénients mentionnés ci-avant. JP-A-8084941 describes a rotary sprayer provided with primary orifices and secondary orifices to respectively emit primary air jets and secondary air jets. The primary air jets and the secondary air jets are oriented in respective parallel or diverging directions, which produces marginal and low-volume overlaps between adjacent jets. Such a rotary projector therefore also has the disadvantages mentioned above.

La présente invention vise notamment à remédier à ces inconvénients en proposant un projecteur rotatif de produit de revêtement permettant d'obtenir des rendements de dépôt relativement élevés ainsi qu'une bonne robustesse des impacts de produit de revêtement sur les objets à revêtir.The present invention aims in particular to remedy these drawbacks by proposing a rotating coating product sprayer making it possible to obtain relatively high deposition yields as well as good robustness of the impacts of the coating product on the objects to be coated.

A cet effet, l'invention a pour objet un projecteur rotatif de produit de revêtement comportant :

  • un organe de pulvérisation du produit de revêtement présentant au moins une arête globalement circulaire et apte à former un jet de produit de revêtement,
  • des moyens d'entraînement en rotation de l'organe de pulvérisation et
  • un corps qui est fixe et qui comprend :
    • des orifices primaires disposés sur un contour primaire entourant l'axe de rotation de l'organe de pulvérisation, chaque orifice primaire étant destiné à éjecter un jet d'air primaire suivant une direction primaire,
    • des orifices secondaires disposés sur un contour secondaire entourant l'axe de rotation de l'organe de pulvérisation, chaque orifice secondaire étant destiné à éjecter un jet d'air secondaire suivant une direction secondaire, le contour primaire et le contour secondaire présentant chacun une forme circulaire et étant confondus en un cercle centré sur l'axe de rotation.
To this end, the subject of the invention is a rotating coating product projector comprising:
  • a coating product spraying member having at least one generally circular edge and able to form a jet of coating product,
  • means for driving the spray member in rotation and
  • a body which is fixed and which comprises:
    • primary orifices arranged on a primary contour surrounding the axis of rotation of the spray member, each primary orifice being intended to eject a jet of primary air in a primary direction,
    • secondary orifices arranged on a secondary contour surrounding the axis of rotation of the spray member, each secondary orifice being intended to eject a jet of secondary air in a secondary direction, the primary contour and the secondary contour each having a shape circular and being merged into a circle centered on the axis of rotation.

Les orientations respectives de chaque direction primaire et de chaque direction secondaire ainsi que les positions respectives de chaque orifice primaire et de chaque orifice secondaire induisent la formation de jets combinés résultant chacun de l'intersection d'au moins un jet d'air primaire et d'au moins un jet d'air secondaire associés, la région d'intersection se situant en amont de l'arête, et le rapport entre le diamètre de l'arête et le diamètre du cercle étant compris entre 0,65 et 1 et de préférence égal à 0,95.The respective orientations of each primary direction and of each secondary direction as well as the respective positions of each primary orifice and each secondary orifice induce the formation of combined jets each resulting from the intersection of at least one primary air jet and at least one associated secondary air jet, the intersection region being located upstream of the edge, and the ratio between the diameter of the edge and the diameter of the circle being between 0.65 and 1 and of preference equal to 0.95.

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

  • chaque direction primaire et l'organe de pulvérisation sont disjoints et en ce que chaque direction secondaire est sécante à l'organe de pulvérisation ;
  • chaque direction secondaire s'étend dans un plan comprenant l'axe de rotation et les directions secondaires convergent globalement vers un sommet situé sur l'axe de rotation ;
  • chaque orifice primaire et l'orifice secondaire associé sont séparés par une distance comprise entre 0°mm et 10°mm, de préférence égale à 1 mm ;
  • les orifices primaires et les orifices secondaires sont positionnés respectivement sur le contour primaire et sur le contour secondaire de façon à mélanger en partie deux jets combinés voisins ;
  • l'ensemble des directions primaires et l'ensemble des directions secondaires présentent respectivement une symétrie par rapport à l'axe de rotation ;
  • la distance entre le contour primaire et l'arête, prise suivant l'axe de rotation, est comprise entre 5 mm et 30 mm et en ce que la distance entre le contour secondaire et l'arête, prise suivant l'axe de rotation, est comprise entre 5 mm et 30 mm ;
  • le contour primaire et le contour secondaire sont disposés dans un plan commun, le plan commun étant perpendiculaire à l'axe de rotation ;
  • le contour primaire et le contour secondaire sont disposés sur une surface globalement tronconique qui s'étend dans la partie aval du corps fixe et autour de l'axe de rotation du bol ;
  • le corps comprend entre 20 et 60 orifices primaires et entre 20 et 60 orifices secondaires ; les orifices primaires et les orifices secondaires sont circulaires ; les orifices primaires sont agencés sur le cercle en alternance avec les orifices secondaires et le diamètre des orifices primaires et le diamètre des orifices secondaires sont compris entre 0,4 mm et 1,2 mm et de préférence égaux à 0,8 mm ;
  • une direction primaire et une direction secondaire associée se rejoignent en un point de rencontre, la distance selon l'axe de rotation entre le plan commun et le point de rencontre étant comprise entre 0,5 fois et 30 fois, de préférence entre 1 fois et 2 fois, la plus grande dimension des orifices primaires ou secondaires (6) prise dans le plan commun ;
  • chaque jet combiné présente une section dans le plan de l'arête qui est globalement en forme d'ellipse tronquée par l'arête, le grand axe de l'ellipse étant incliné par rapport à une direction localement tangente à l'arête d'un angle compris entre 20°et 70°, de préférence entre 35°e t 55°, et
  • les directions primaires passent à une distance radiale de l'arête comprise entre 0 mm et 25 mm et de préférence égale à 0 mm et les directions secondaires coupent l'organe de pulvérisation à une distance axiale de l'arête comprise entre 0 mm et 25 mm et de préférence égale à 3,5 mm.
According to other advantageous but optional characteristics of the invention, taken in isolation or according to any technically permissible combination:
  • each primary direction and the spray member are separate and in that each secondary direction is secant to the spray member;
  • each secondary direction extends in a plane comprising the axis of rotation and the secondary directions generally converge towards a vertex located on the axis of rotation;
  • each primary orifice and the associated secondary orifice are separated by a distance of between 0°mm and 10°mm, preferably equal to 1 mm;
  • the primary orifices and the secondary orifices are positioned respectively on the primary contour and on the secondary contour so as to partly mix two neighboring combined jets;
  • the set of primary directions and the set of secondary directions respectively have symmetry with respect to the axis of rotation;
  • the distance between the primary contour and the edge, taken along the axis of rotation, is between 5 mm and 30 mm and in that the distance between the secondary contour and the edge, taken along the axis of rotation, is between 5 mm and 30 mm;
  • the primary contour and the secondary contour are arranged in a common plane, the common plane being perpendicular to the axis of rotation;
  • the primary contour and the secondary contour are arranged on a generally frustoconical surface which extends in the downstream part of the fixed body and around the axis of rotation of the bowl;
  • the body comprises between 20 and 60 primary orifices and between 20 and 60 secondary orifices; the primary orifices and the secondary orifices are circular; the primary orifices are arranged on the circle alternately with the secondary orifices and the diameter of the primary orifices and the diameter of the secondary orifices are between 0.4 mm and 1.2 mm and preferably equal to 0.8 mm;
  • a primary direction and an associated secondary direction meet at a meeting point, the distance along the axis of rotation between the common plane and the meeting point being between 0.5 times and 30 times, preferably between 1 time and twice, the largest dimension of the primary or secondary orifices (6) taken in the common plane;
  • each combined jet has a section in the plane of the edge which is generally in the form of an ellipse truncated by the edge, the major axis of the ellipse being inclined with respect to a direction locally tangent to the edge of a angle between 20° and 70°, preferably between 35° and 55°, and
  • the primary directions pass at a radial distance from the edge of between 0 mm and 25 mm and preferably equal to 0 mm and the secondary directions intersect the spray member at an axial distance from the edge of between 0 mm and 25 mm and preferably equal to 3.5 mm.

Par ailleurs, la présente invention a pour objet un procédé de projection de produit de revêtement, mettant en oeuvre un projecteur rotatif tel qu'exposé ci-dessus, avec un débit d'air total compris entre 100 NL/min et 1000 NL/min, de préférence entre 300 NL/min et 800 NL/min et comprenant de 25% à 75%, de préférence 33%, de débit des jets d'air primaire et de 75% à 25%, de préférence 67%, de débit des jets d'air secondaire.Furthermore, the subject of the present invention is a process for spraying coating product, using a rotary sprayer as described above, with a total air flow of between 100 NL/min and 1000 NL/min. , preferably between 300 NL/min and 800 NL/min and comprising from 25% to 75%, preferably 33%, of flow rate of the primary air jets and from 75% to 25%, preferably 67%, of flow rate secondary air jets.

D'autre part l'invention a pour objet une installation de projection de produit de revêtement, qui comprend au moins un projecteur rotatif tel qu'exposé ci-dessus.On the other hand, the subject of the invention is a coating product spraying installation, which comprises at least one rotary sprayer as described above.

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

  • la figure 1 est une vue en perspective avec arraché d'un projecteur rotatif conforme à l'invention ;
  • la figure 2 est une vue en perspective, à plus grande échelle et selon un angle différent de celle de la figure 1, d'une partie du projecteur de la figure 1 ;
  • la figure 3 est une vue analogue à la figure 2, à plus petite échelle, illustrant notamment une caractéristique de l'invention ;
  • la figure 4 est une vue analogue à la figure 3 illustrant notamment une caractéristique de l'invention ;
  • la figure 5 est une vue du détail V à la figure 4 ;
  • la figure 6 est une vue de face suivant la flèche VI à la figure 5 ;
  • la figure 7 est une vue analogue à la figure 4 et illustrant le fonctionnement de l'invention ; et
  • la figure 8 est une vue du détail VIII à la figure 7.
The invention will be well understood and its advantages will also emerge in the light of the following description, given solely by way of non-limiting example and made with reference to the appended drawings in which:
  • the figure 1 is a cut-away perspective view of a rotary projector according to the invention;
  • the picture 2 is a perspective view, on a larger scale and from a different angle than the figure 1 , of part of the headlight of the figure 1 ;
  • the picture 3 is a view analogous to figure 2 , on a smaller scale, illustrating in particular a characteristic of the invention;
  • the figure 4 is a view analogous to picture 3 illustrating in particular a characteristic of the invention;
  • the figure 5 is a view of detail V at figure 4 ;
  • the figure 6 is a front view along the arrow VI on the figure 5 ;
  • the figure 7 is a view analogous to figure 4 and illustrating the operation of the invention; and
  • the figure 8 is a view of detail VIII at figure 7 .

La figure 1 montre un projecteur rotatif P pour la projection de produit de revêtement comportant un organe de pulvérisation 1, ci-après dénommé bol. Le bol 1 est logé partiellement au sein d'un corps 2. Le bol 1 est représenté dans une position de pulvérisation où il est entraîné en rotation à haute vitesse autour d'un axe X1 par des moyens d'entraînement non représentés. L'axe X1 constitue donc l'axe de rotation du bol 1. Le corps 2 est fixe, c'est-à-dire qu'il ne tourne pas autour de l'axe X1. Le corps 2 peut être monté sur un support non représenté tel qu'un bras de robot multiaxes.The figure 1 shows a rotary projector P for the projection of coating product comprising a spray member 1, hereinafter referred to as a bowl. The bowl 1 is partially housed within a body 2. The bowl 1 is shown in a spraying position where it is rotated at high speed around an axis X 1 by drive means, not shown. The axis X 1 therefore constitutes the axis of rotation of the bowl 1. The body 2 is fixed, that is to say it does not rotate around the axis X 1 . The body 2 can be mounted on a support, not shown, such as a multi-axis robot arm.

Un distributeur 3 est solidarisé à la partie amont du bol 1 pour canaliser et répartir le produit de revêtement. La vitesse de rotation du bol 1 en charge, c'est-à-dire lorsqu'il pulvérise du produit, peut être comprise entre 30.000 trs/mn et 70.000 trs/mn.A distributor 3 is secured to the upstream part of the bowl 1 to channel and distribute the coating product. The speed of rotation of bowl 1 under load, that is to say when it is spraying product, can be between 30,000 rpm and 70,000 rpm.

Le bol 1 présente une symétrie de révolution autour de l'axe X1. Le bol 1 comporte une surface de répartition 11 sur laquelle le produit de revêtement s'étale, sous l'effet de la force centrifuge, jusqu'à une arête de pulvérisation 12 où il est micronisé en fines gouttelettes. L'ensemble des gouttelettes forme un jet de produit non représenté qui quitte le bol 1 et se dirige vers un objet à revêtir non représenté sur lequel il produit un impact. La surface arrière externe 13 du bol 1, c'est-à-dire la surface qui n'est pas tournée vers son axe de symétrie X1, est tournée vers le corps 2.The bowl 1 has a symmetry of revolution around the axis X 1 . The bowl 1 has a distribution surface 11 on which the coating product spreads, under the effect of centrifugal force, up to a spray edge 12 where it is micronized into fine droplets. All of the droplets form a jet of product, not shown, which leaves the bowl 1 and goes towards an object to be coated, not shown, on which it produces an impact. The outer rear surface 13 of the bowl 1, that is to say the surface which is not turned towards its axis of symmetry X 1 , is turned towards the body 2.

Le corps 2 présente des orifices primaires 4 et des orifices secondaires 6. Les orifices primaires 4 sont disposés sur un contour primaire C4 qui entoure l'axe X1. De même, les orifices secondaires 6 sont disposés sur un contour secondaire C6 qui entoure l'axe X1. Le contour primaire C4 et le contour secondaire C6 sont disposés dans un plan commun P46. Le plan commun P46 est perpendiculaire à l'axe X1. Le plan P46 se trouve dans la partie aval du corps 2. Dans la mesure où le corps 2 présente une symétrie de révolution autour de l'axe X1, le plan commun P46 est matérialisé par un anneau plan comprenant les contours primaire C4 et secondaire C6.The body 2 has primary orifices 4 and secondary orifices 6. The primary orifices 4 are arranged on a primary contour C 4 which surrounds the axis X 1 . Similarly, the secondary orifices 6 are arranged on a secondary contour C 6 which surrounds the axis X 1 . The primary contour C 4 and the secondary contour C 6 are arranged in a common plane P 46 . The common plane P 46 is perpendicular to the axis X 1 . The plane P 46 is located in the downstream part of the body 2. Insofar as the body 2 has a symmetry of revolution around the axis X 1 , the common plane P 46 is materialized by a plane ring comprising the primary contours C 4 and secondary C 6 .

Les termes « amont » et « aval » font référence au sens d'écoulement du produit depuis l'embase du projecteur rotatif P, situé à la droite de la figure 1, jusqu'à l'arête 12, située à la gauche de la figure 1.The terms "upstream" and "downstream" refer to the direction of flow of the product from the base of the rotary projector P, located to the right of the figure 1 , to ridge 12, located to the left of the figure 1 .

Dans l'exemple des figures 1 à 8, le contour primaire C4 et le contour secondaire C6 présente chacun une forme circulaire centrée sur l'axe X1. De plus, le contour primaire C4 et le contour C6 sont confondus en un cercle C qui est donc centré sur l'axe X1 et sur lequel sont disposés les orifices primaires 4 et les orifices secondaires 6. Ainsi, les orifices primaires 4 et les orifices secondaires 6 appartiennent au corps 2.In the example of figures 1 to 8 , the primary contour C 4 and the secondary contour C 6 each has a circular shape centered on the axis X 1 . In addition, the primary contour C 4 and the contour C 6 coincide in a circle C which is therefore centered on the axis X 1 and on which the primary orifices 4 and the secondary orifices 6 are arranged. Thus, the primary orifices 4 and the secondary orifices 6 belong to the body 2.

L'arête 12 présente globalement la forme d'un cercle de diamètre D12 centré sur l'axe X1. Des crantages sont réalisés entre la surface de répartition 11 et l'arête 12, dont certains sont représentés à la figure 2 avec la référence 14, pour améliorer le contrôle de la taille des gouttelettes micronisées au niveau de l'arête 12. L'arête 12 se trouve à une distance axiale L1 du cercle C, donc du contour primaire C4 ou du contour secondaire (C6) vaut ici 10 mm. En pratique, la distance L1 peut est comprise entre 5 mm et 30 mm. La distance L1 représente le dépassement du bol 1 hors du corps 2. L'adjectif « axial » qualifie une distance ou, plus généralement, une entité qui s'étend suivant la direction de l'axe X1.Edge 12 generally has the shape of a circle of diameter D 12 centered on axis X 1 . Serrations are made between the distribution surface 11 and the edge 12, some of which are shown in picture 2 with the reference 14, to improve the control of the size of the micronized droplets at the level of the edge 12. The edge 12 is at an axial distance L 1 from the circle C, therefore from the primary contour C 4 or from the secondary contour ( C 6 ) is here 10 mm. In practice, the distance L 1 may be between 5 mm and 30 mm. The distance L 1 represents the protrusion of the bowl 1 from the body 2. The adjective “axial” qualifies a distance or, more generally, an entity which extends along the direction of the axis X 1 .

Le diamètre D du cercle C, vaut ici 52,6 mm pour un bol 1 de diamètre égal à 50 mm. En pratique, le diamètre D peut être compris entre 50 mm et 77 mm pour un tel bol. Le rapport entre le diamètre D12 de l'arête 12 et le diamètre D du cercle C est égal à 0,95. Selon l'invention, ce rapport doit être compris entre 0,65 et 1.The diameter D of the circle C is here equal to 52.6 mm for a bowl 1 with a diameter equal to 50 mm. In practice, the diameter D can be between 50 mm and 77 mm for such a bowl. The ratio between the diameter D 12 of the edge 12 and the diameter D of the circle C is equal to 0.95. According to the invention, this ratio must be between 0.65 and 1.

Les orifices primaires 4 et les orifices secondaires 6 sont destinés à émettre respectivement des jets d'air primaires J4 et des jets d'air secondaires J6 qui sont représentés sur les figures 1 et 8 par leurs directions respectives, primaires X4 et secondaires X6. Par « direction primaire » on désigne la direction d'éjection d'un jet primaire J4. Par « direction secondaire » on désigne la direction d'éjection d'un jet d'air secondaire J6.The primary orifices 4 and the secondary orifices 6 are intended to respectively emit primary air jets J 4 and secondary air jets J 6 which are represented on the figure 1 and 8 by their respective directions, primary X 4 and secondary X 6 . By “primary direction” is meant the direction of ejection of a primary jet J 4 . By “secondary direction” is meant the direction of ejection of a jet of secondary air J 6 .

Comme le montrent les figures 2 à 5, chaque jet d'air primaire J4 est incliné sur l'axe X1 selon une direction primaire X4. Chaque direction primaire X4 s'étend obliquement par rapport à l'axe X1 et par rapport au plan commun P46. En d'autres termes, chaque direction primaire X4 a des composantes non nulles suivant les trois directions d'un repère cartésien dont l'origine se confond avec l'orifice primaire 4 correspondant, à savoir la direction de l'axe X1, une direction radiale et une direction orthoradiale, c'est-à-dire circonférentielle ou tangentielle. Chaque direction primaire X4 et le bol 1 sont disjoints, si bien que chaque jet d'air primaire J4 peut franchir librement la région où se trouve l'arête 12.As shown by the figures 2 to 5 , each primary air jet J 4 is inclined on the axis X 1 in a primary direction X 4 . Each primary direction X 4 extends obliquely relative to the axis X 1 and relative to the common plane P 46 . In other words, each primary direction X 4 has non-zero components along the three directions of a Cartesian coordinate system whose origin merges with the corresponding primary orifice 4, namely the direction of the axis X 1 , a radial direction and an orthoradial direction, that is to say circumferential or tangential. Each primary direction X 4 and the bowl 1 are separate, so that each primary air jet J 4 can freely cross the region where the edge 12 is located.

En d'autres termes, les jets d'air primaires J4 ne frappent pas la surface arrière externe 13 du bol 1. Les jets primaires J4 génèrent ensemble un flux d'air tourbillonnant, dénommé « air de vortex », qui est apte à influencer la forme du jet de produit de revêtement. Chaque direction primaire X4 est telle que le jet d'air primaire J4 correspondant s'écoule à une distance radiale r4 de l'arête 12 valant 5 mm. En pratique, la distance r4 est non nulle et inférieure à 25 mm. La distance r4 dépend notamment de la distance axiale L1.In other words, the primary air jets J 4 do not hit the outer rear surface 13 of the bowl 1. The primary jets J 4 together generate a swirling air flow, called "vortex air", which is capable to influence the shape of the spray of coating material. Each primary direction X 4 is such that the corresponding primary air jet J 4 flows at a radial distance r 4 from edge 12 equal to 5 mm. In practice, the distance r 4 is non-zero and less than 25 mm. The distance r 4 depends in particular on the axial distance L 1 .

Chaque jet d'air secondaire J6 est incliné par rapport à l'axe X1 selon une direction secondaire X6 qui s'étend obliquement par rapport à l'axe X1. Chaque direction secondaire X6 est telle que le jet d'air secondaire J6 correspondant vienne frapper la surface arrière externe 13 du bol 1, comme cela ressort de la figure 2. Ainsi, chaque direction secondaire X6 est sécante à la surface définissant le bol 1 et elle « coupe » le bol 1 à une distance axiale L136 de l'arête 12 valant 3,5 mm. En pratique, la distance L136 peut être comprise entre 0 mm et 25 mm.Each secondary air jet J 6 is inclined with respect to the axis X 1 in a secondary direction X 6 which extends obliquely with respect to the axis X 1 . each direction secondary X 6 is such that the corresponding secondary air jet J 6 strikes the outer rear surface 13 of the bowl 1, as is apparent from the picture 2 . Thus, each secondary direction X 6 is secant to the surface defining the bowl 1 and it “intersects” the bowl 1 at an axial distance L 136 from the edge 12 equal to 3.5 mm. In practice, the distance L 136 can be between 0 mm and 25 mm.

De plus, chaque direction secondaire X6 s'étend dans un plan comprenant l'axe X1 (plan méridien). Les directions secondaires X6 convergent vers un sommet S6 qui est situé sur l'axe X1. En d'autres termes, la direction secondaire X6 est transversale à l'axe de rotation X1. Chaque direction secondaire X6 peut ainsi être assimilée à une génératrice d'un cône dont le sommet S6 appartient à l'axe X1. Dans un repère cartésien centré sur un orifice secondaire 6 et dont les axes sont formés par l'axe X1, une direction radiale et une direction orthoradiale, on a une composante orthoradiale nulle pour la direction secondaire X6 correspondant à l'orifice secondaire 6 qui forme l'origine de ce repère.Moreover, each secondary direction X 6 extends in a plane comprising the axis X 1 (meridian plane). The secondary directions X 6 converge towards a vertex S 6 which is located on the axis X 1 . In other words, the secondary direction X 6 is transverse to the axis of rotation X 1 . Each secondary direction X 6 can thus be assimilated to a generatrix of a cone whose vertex S 6 belongs to the axis X 1 . In a Cartesian coordinate system centered on a secondary orifice 6 and whose axes are formed by the axis X 1 , a radial direction and an orthoradial direction, there is a null orthoradial component for the secondary direction X 6 corresponding to the secondary orifice 6 which forms the origin of this marker.

En pratique, les directions secondaires X6 peuvent ne pas converger tout à fait, mais plutôt confluer dans une zone faiblement étendue et proche de l'axe X1. Selon une variante non représentée, les directions secondaires X6 peuvent être disjointes, c'est-à-dire ne pas confluer ni converger, à l'instar des directions primaires X4 dans l'exemple des figures 1 à 8.In practice, the secondary directions X 6 may not completely converge, but rather converge in a slightly extended area close to the axis X 1 . According to a variant not shown, the secondary directions X 6 can be disjoint, that is to say not confluent nor converge, like the primary directions X 4 in the example of the figures 1 to 8 .

Comme le montre la figure 3, l'ensemble des directions primaires X4 des jets d'air primaires J4 et l'ensemble des directions secondaires X6 des jets d'air J6 présentent respectivement une symétrie par rapport à l'axe X1. Cependant, d'autres orientations des directions primaires et secondaires sont possibles, en particulier des orientations dissymétriques.As shown in picture 3 , the set of primary directions X 4 of the primary air jets J 4 and the set of secondary directions X 6 of the air jets J 6 respectively exhibit symmetry with respect to the axis X 1 . However, other orientations of the primary and secondary directions are possible, in particular asymmetrical orientations.

Sur le cercle C, les orifices primaires 4 sont agencés en alternance avec les orifices secondaires 6. Comme le montrent les figures 1 à 8, les orifices primaires 4 et secondaires 6 sont répartis uniformément sur le cercle C, si bien que deux orifices primaires 4 successifs ou deux orifices secondaires 6 successifs sont écartés d'un même angle B valant 9° qui est visible à la figure 6. En pratique, cet angle B peut être compris entre 6° et 18°.On the circle C, the primary orifices 4 are arranged alternately with the secondary orifices 6. As shown by the figures 1 to 8 , the primary 4 and secondary 6 orifices are distributed uniformly on the circle C, so that two successive primary orifices 4 or two successive secondary orifices 6 are separated by the same angle B equal to 9° which is visible at the figure 6 . In practice, this angle B can be between 6° and 18°.

De plus, un orifice primaire 4 et un orifice secondaire 6 voisins sont écartés d'un angle A valant 6,7°, qui est visible à la figure 6, c'est-à-dire la moitié de l'angle B séparant par exemple deux orifices primaires 4 successifs. En pratique, l'écart angulaire A entre un orifice primaire 4 et un orifice secondaire 6 peut être compris entre 3° et 12°.In addition, a primary orifice 4 and a neighboring secondary orifice 6 are spaced apart by an angle A equal to 6.7°, which is visible at the figure 6 , that is to say half of the angle B separating for example two successive primary orifices 4. In practice, the angular difference A between a primary orifice 4 and a secondary orifice 6 can be between 3° and 12°.

Un orifice primaire 4 et un orifice secondaire 6 adjacent sont séparés par une distance c46 valant 1 mm. En pratique, la distance c46 peut être comprise entre 0 mm et 10 mm. Comme cela est décrit par la suite, une telle distance c46 permet de réaliser l'addition des jets primaires J4 et secondaires J6.A primary orifice 4 and an adjacent secondary orifice 6 are separated by a distance c 46 equal to 1 mm. In practice, the distance c 46 can be between 0 mm and 10 mm. As described below, such a distance c 46 makes it possible to add the primary jets J 4 and secondary jets J 6 .

Le nombre et la répartition des orifices primaires 4 et secondaires 6 est déterminé en fonction de la précision recherchée pour le contrôle de la forme du jet de produit et de la régularité souhaitée pour la surface d'impact. Ainsi, plus les orifices 4 et 6 sont nombreux, plus la surface d'impact est régulière. Le corps 2 comprend environ quarante orifices primaires 4 et environ quarante orifices secondaires 6. En pratique, le corps 2 peut comprendre entre vingt et soixante orifices primaires 4 et entre vingt et soixante orifices secondaires 6. En variante, on peut prévoir des orifices primaires et des orifices secondaires en nombres différents.The number and distribution of the primary 4 and secondary 6 orifices is determined according to the precision sought for controlling the shape of the jet of product and the regularity desired for the impact surface. Thus, the more orifices 4 and 6 there are, the more regular the impact surface. The body 2 comprises approximately forty primary orifices 4 and approximately forty secondary orifices 6. In practice, the body 2 may comprise between twenty and sixty primary orifices 4 and between twenty and sixty secondary orifices 6. Alternatively, primary orifices and secondary orifices in different numbers.

Les orifices primaires 4 et secondaires 6 ont des diamètres respectifs d4 et d6, qui sont visibles à la figure 6, valant tous deux 0,8 mm. En pratique, les diamètres d4 et d6 des orifices primaires 4 et secondaires 6 peuvent être compris entre 0,4 mm et 1,2 mm. En particulier, les diamètres d4 et d6 peuvent être différents l'un de l'autre.The primary 4 and secondary 6 orifices have respective diameters d 4 and d 6 , which are visible at figure 6 , both being 0.8 mm. In practice, the diameters d 4 and d 6 of the primary 4 and secondary 6 orifices can be between 0.4 mm and 1.2 mm. In particular, the diameters d 4 and d 6 can be different from each other.

De telles dimensions permettent d'émettre des jets d'air primaire J4 et secondaires J6 avec des débits valant respectivement 200 NL/min (normaux-litres par minute) et 400 NL/min, lorsqu'ils sont alimentés sous des pressions respectives de 6 bars et de 6 bars. Comme le montrent les figures 2 et 3, chaque jet d'air primaire J4 et chaque jet d'air secondaire J6 éclate en un cône de demi-angle au sommet relativement faible d'environ 10°.Such dimensions make it possible to emit primary J 4 and secondary J 6 air jets with flow rates of respectively 200 NL/min (normal-litres per minute) and 400 NL/min, when they are supplied under respective pressures 6 bar and 6 bar. As shown by the figure 2 and 3 , each primary air jet J 4 and each secondary air jet J 6 bursts into a cone with a relatively small apex half-angle of approximately 10°.

Les directions primaires J4 et secondaires J6 sont ici déterminées respectivement par les orientations de canaux primaires 40 et de canaux secondaires 60 définis dans le corps 2. Les directions primaires X4 et secondaires X6 correspondent à la direction des axes respectifs des canaux primaires 40 et secondaires 60. Dans l'exemple des figures 1 à 8, les canaux 40 et 60 sont rectilignes et débouchent respectivement sur les orifices primaires 4 et secondaires 6. En amont, les canaux 40 et 60 sont reliés à deux sources indépendantes d'alimentation en air comprimé décrites ci-après pour former les jets J4 et J6.The primary directions J 4 and secondary J 6 are determined here respectively by the orientations of primary channels 40 and secondary channels 60 defined in the body 2. The primary directions X 4 and secondary X 6 correspond to the direction of the respective axes of the primary channels 40 and secondaries 60. In the example of figures 1 to 8 , the channels 40 and 60 are straight and open respectively on the primary 4 and secondary 6 orifices. Upstream, the channels 40 and 60 are connected to two independent sources of compressed air supply described below to form the jets J 4 and J 6 .

Comme le montre la figure 1, les canaux primaires 40 et secondaires 60 s'étendent de façon rectiligne à travers une chemise externe 22 qui prolonge un capot 20 définissant l'enveloppe externe du corps 2. Les canaux 40 et 60 sont réalisés au moyen d'opérations de perçage selon les angles appropriés. Les canaux primaires 40 sont reliés en amont, à une chambre primaire qui leur est commune et qui est elle-même reliée à une source d'air comprimé non représentée. De même, les canaux secondaires 60 sont reliés à une chambre secondaire qui leur est commune et qui est reliée à une source d'air comprimé non représentée et indépendante de la source alimentant les canaux primaires 40.As shown in figure 1 , the primary 40 and secondary 60 channels extend straight through an outer jacket 22 which extends a cover 20 defining the outer envelope of the body 2. The channels 40 and 60 are made by means of drilling operations according to the appropriate angles. The primary channels 40 are connected upstream, to a primary chamber which is common to them and which is itself connected to a source of compressed air, not shown. Similarly, the secondary channels 60 are connected to a secondary chamber which is common to them and which is connected to a source of compressed air, not shown, and independent of the source supplying the primary channels 40.

Les chambres primaire et secondaire sont ici formées entre la chemise externe 22 et une chemise interne 24, et elles sont séparées par un joint torique d'étanchéité. L'adjectif « interne » désigne ici un objet proche de l'axe de rotation X1, tandis que l'adjectif « externe » désigne un objet qui en est plus éloigné. Les chemises 22 et 24 présentent globalement une symétrie de révolution autour de l'axe X1.The primary and secondary chambers are here formed between the outer jacket 22 and an inner jacket 24, and they are separated by an O-ring seal. The adjective “internal” designates here an object close to the axis of rotation X 1 , while the adjective “external” designates an object which is further from it. The sleeves 22 and 24 generally have a symmetry of revolution around the axis X 1 .

Alternativement, les canaux primaires 40 et/ou secondaires 60 peuvent être définis par des interstices formés entre les chemises externe 22 et interne 24. Ces interstices peuvent dans ce cas être réalisés par usinage de crantages sur l'une et/ou l'autre des surfaces en regard des chemises interne 24 et externe 22.Alternatively, the primary channels 40 and/or secondary 60 can be defined by gaps formed between the outer 22 and inner 24 liners. These gaps can in this case be made by machining notches on one and/or the other of the surfaces facing the inner 24 and outer liners 22.

La géométrie des orifices primaires 4 et secondaires 6 induit la formation de jets combinés J46 qui résultent chacun de l'intersection d'un jet d'air primaire J4 et d'un jet d'air secondaire J6. Plus précisément, les orientations respectives de chaque direction primaire X4 et de chaque direction secondaire X6, notamment par rapport à l'axe X1, ainsi que les positions respectives de chaque orifice primaire 4 et de chaque orifice secondaire 6 induisent, et donc sont déterminées pour, la formation de jets combinés J46, comme le montrent les figures 5 à 8.The geometry of the primary 4 and secondary 6 orifices induces the formation of combined jets J 46 which each result from the intersection of a primary air jet J 4 and a secondary air jet J 6 . More precisely, the respective orientations of each primary direction X 4 and of each secondary direction X 6 , in particular with respect to the axis X 1 , as well as the respective positions of each primary orifice 4 and of each secondary orifice 6 induce, and therefore are determined for the formation of combined jets J 46 , as shown by the figures 5 to 8 .

En outre, pour un jet d'air primaire J4 et un jet d'air secondaire J6 associé, les orientations et les positions mentionnées ci-dessus sont déterminées de telle sorte que leur région d'intersection R46, visible à la figure 5, se situe en amont de l'arête 12. La région d'intersection R46 correspond au volume où un jet d'air primaire J4 rencontre le jet d'air secondaire J6 associé, ce qui génère un jet combiné J46.Furthermore, for a primary air jet J 4 and an associated secondary air jet J 6 , the orientations and positions mentioned above are determined such that their region of intersection R 46 , visible at figure 5 , is located upstream of the ridge 12. The intersection region R 46 corresponds to the volume where a primary air jet J 4 meets the associated secondary air jet J 6 , which generates a combined jet J 46 .

En d'autres termes, un jet d'air primaire J4 et le jet d'air secondaire J6 associé se dévient et se combinent mutuellement en un jet combiné J46. Dans la présente demande, le terme « combiné » indique qu'un un jet d'air primaire et un jet d'air secondaire interagissent et s'additionnent de façon importante. Comme le montrent les figures 7 et 8, chaque jet d'air combiné J46 présente globalement la forme d'un cône s'évasant depuis la région d'intersection R46 jusqu'en aval de l'arête 12.In other words, a primary air jet J 4 and the associated secondary air jet J 6 deflect and mutually combine into a combined jet J 46 . In the present application, the term “combined” indicates that a jet of primary air and a jet of secondary air interact and add up significantly. As shown by the figures 7 and 8 , each combined air jet J 46 generally has the shape of a cone widening from the intersection region R 46 to downstream of the edge 12.

Une direction primaire X4 et une direction secondaire X6 associée se rejoignent, de préférence, en un point de rencontre 46 appartenant à la région d'intersection R46. Ainsi, l'intersection, ou l'interaction, du jet d'air primaire et du jet d'air secondaire correspondants est maximale. Le débit de chaque jet d'air combiné correspond sensiblement à l'addition des débits du jet d'air primaire et du jet d'air secondaire qui l'ont généré. Cela permet d'optimiser le rendement de dépôt et la robustesse des impacts de produit de revêtement sur les objets à revêtir.A primary direction X 4 and an associated secondary direction X 6 preferably meet at a meeting point 46 belonging to the intersection region R 46 . Thus, the intersection, or the interaction, of the primary air jet and of the corresponding secondary air jet is maximal. The flow rate of each combined air jet corresponds substantially to the addition of the flow rates of the primary air jet and of the secondary air jet which generated it. This makes it possible to optimize the yield of deposition and the robustness of the impacts of the coating product on the objects to be coated.

Le point de rencontre 46 se trouve à une distance axiale L46 du plan commun P46 comprise entre 1 fois et 2 fois la plus grande dimension des orifices primaires 4 ou secondaires 6. Cette plus grande dimension est prise dans le plan commun P46. En l'occurrence, il s'agit indifféremment du diamètre d4 ou du diamètre d6, puisque les orifices primaires 4 et secondaires 6 ont le même diamètre. En pratique, la distance axiale L46 entre le point de rencontre 46 et le plan commun P46 est comprise entre 0,5 fois et 30 fois cette plus grande dimension.The meeting point 46 is located at an axial distance L 46 from the common plane P 46 of between 1 time and 2 times the largest dimension of the primary 4 or secondary 6 orifices. This largest dimension is taken in the common plane P 46 . In this case, it is either the diameter d 4 or the diameter d 6 , since the primary 4 and secondary 6 orifices have the same diameter. In practice, the axial distance L 46 between the meeting point 46 and the common plane P 46 is between 0.5 times and 30 times this largest dimension.

Une telle distance axiale L46 permet de réaliser une addition relativement homogène des flux du jet d'air primaire J4 et du jet d'air secondaire J6, donc de limiter les irrégularités du jet combiné J46 au niveau et en aval de l'arête 12.Such an axial distance L 46 makes it possible to achieve a relatively homogeneous addition of the flows of the primary air jet J 4 and of the secondary air jet J 6 , therefore to limit the irregularities of the combined jet J 46 at and downstream of the edge 12.

Comme le montre la figure 6, chaque jet combiné J46 présente, dans le plan de l'arête 12, une section qui est globalement en forme d'ellipse E46 tronquée par l'arête 12. Le flux du jet additionnel ou jet combiné J46 est en effet dévié par la surface arrière externe 13 du bol 1. Le grand axe X46 de l'ellipse E46 est incliné, suivant un angle A46, par rapport à une direction T12 localement tangente à l'arête 12. L'angle A46 est aussi déterminé par les orientations respectives de chaque direction primaire X4 et de chaque direction secondaire X6, ainsi que par les positions respectives de chaque orifice primaire 4 et de chaque orifice secondaire 6.As shown in figure 6 , each combined jet J 46 has, in the plane of the edge 12, a section which is generally in the shape of an ellipse E 46 truncated by the edge 12. The flow of the additional jet or combined jet J 46 is in fact deflected by the outer rear surface 13 of the bowl 1. The major axis X 46 of the ellipse E 46 is inclined, at an angle A 46 , with respect to a direction T 12 locally tangent to the edge 12. The angle A 46 is also determined by the respective orientations of each primary direction X 4 and of each secondary direction X 6 , as well as by the respective positions of each primary orifice 4 and of each secondary orifice 6.

L'angle A46 vaut ici 50°. En pratique, l'angle A46 peut être compris entre 20° et 70°, de préférence entre 35°et 55°. Cette inclinaison de l'ellipse E46, donc du jet combiné J46, permet de rendre uniforme les vitesses d'air dans les flux de jets combinés J46 qui s'écoulent autour de l'arête 12, comme cela est décrit ci-après en relation avec les figures 7 et 8.The angle A 46 is here equal to 50°. In practice, the angle A 46 can be between 20° and 70°, preferably between 35° and 55°. This inclination of the ellipse E 46 , therefore of the combined jet J 46 , makes it possible to make the air velocities uniform in the flows of combined jets J 46 which flow around the edge 12, as described below. afterwards in relation to figures 7 and 8 .

Comme le montrent les figures 7 et 8, les orifices primaires 4 et les orifices secondaires 6 sont positionnés respectivement sur le contour primaire C4 et sur le contour secondaire C6, c'est-à-dire ici sur le cercle C, de façon à mélanger en partie deux jets combinés J46 voisins. Ainsi, chaque région latérale d'un jet combiné J46, considérée suivant la direction T12, définie par une tangente à l'arête 12, se mélange à une région latérale du jet combiné J46 voisin. Les volumes de mélange F46 sont représentés par leur section hachurée sur la figure 8.As shown by the figures 7 and 8 , the primary orifices 4 and the secondary orifices 6 are positioned respectively on the primary contour C 4 and on the secondary contour C 6 , that is to say here on the circle C, so as to partly mix two combined jets J 46 neighbors. Thus, each lateral region of a combined jet J 46 , considered along the direction T 12 , defined by a tangent to the edge 12, mixes with a lateral region of the neighboring combined jet J 46 . The volumes of F 46 mixture are represented by their hatched section on the figure 8 .

Un tel mélange permet d'assurer une uniformité relativement bonne des vitesses d'air en périphérie de l'arête 12, non seulement si l'on considère un profil de vitesse selon la direction circonférentielle T12, mais aussi si l'on considère un profil de vitesse selon une direction radiale R12.Such a mixture makes it possible to ensure a relatively good uniformity of the air speeds at the periphery of the edge 12, not only if one considers a speed profile along the circumferential direction T 12 , but also if one considers a velocity profile in a radial direction R 12 .

En d'autres termes, les positions respectives des orifices primaires 4 et secondaires 6, ainsi que les orientations respectives des directions primaires X4 et secondaires X6 permettent de réaliser un champ isotrope de vitesses d'air tout autour du bol 1. Par conséquent, les débits d'air traversant deux sections élémentaires de superficie identique mais de position quelconque au sein de l'enveloppe formée par la juxtaposition des jets combinés J46 sont sensiblement les mêmes. Toutes les gouttelettes micronisées par l'arête 12 sont ainsi soumises à des forces aérauliques uniformes et constantes.In other words, the respective positions of the primary 4 and secondary 6 orifices, as well as the respective orientations of the primary X 4 and secondary X 6 directions make it possible to produce an isotropic field of air speeds all around the bowl 1. Consequently , the airflows passing through two elementary sections of identical area but of any position within the envelope formed by the juxtaposition of the combined jets J 46 are substantially the same. All the droplets micronized by the edge 12 are thus subjected to uniform and constant airflow forces.

Cela a pour effet, d'une part, de conférer une robustesse élevée aux impacts de produit de revêtement sur l'objet à revêtir et, d'autre part, d'améliorer sensiblement le rendement du dépôt, ou efficacité de transfert, du produit de revêtement sur l'objet à revêtir. En effet, les forces aérauliques uniformes et constantes permettent de réduire la quantité de produit de revêtement non déposé sur l'objet à revêtir, généralement dénommé « overspray ».This has the effect, on the one hand, of conferring high robustness to impacts of the coating product on the object to be coated and, on the other hand, of significantly improving the yield of the deposition, or transfer efficiency, of the product. coating on the object to be coated. Indeed, the uniform and constant air forces make it possible to reduce the quantity of coating product not deposited on the object to be coated, generally referred to as “overspray”.

Il a ainsi été constaté, dans diverses conditions d'essais, une augmentation du rendement du dépôt d'environ 10%. Le rendement de dépôt passe ainsi d'environ 75% pour un projecteur rotatif de l'art antérieur à environ 87% pour un projecteur rotatif conforme à l'invention. Pour une installation de projection de produit de revêtement conforme à l'invention et comprenant un projecteur rotatif conforme à l'invention, un tel rendement de dépôt représente des économies considérables sur le produit de revêtement à projeter et sur les effluents à retraiter.It has thus been observed, under various test conditions, an increase in the yield of the deposit of approximately 10%. The deposit yield thus goes from approximately 75% for a rotary projector of the prior art to about 87% for a rotary projector according to the invention. For a coating product spraying installation according to the invention and comprising a rotary sprayer according to the invention, such a deposition yield represents considerable savings on the coating product to be sprayed and on the effluents to be reprocessed.

Le projecteur rotatif P peut être mis en oeuvre selon un procédé de projection de produit de revêtement conforme à l'invention. Avantageusement, le débit des jets d'air primaires J4 et le débit des jets d'air secondaires J6 représentent respectivement 33% et 67% du débit d'air total, lequel peut être compris entre 100 NL/min et 1000 NL/min, de préférence entre 300 NL/min et 800 NL/min. En pratique, le débit des jets d'air primaires J4 peut représenter de 25% à 75% du débit d'air total et le débit d'air secondaire J6 peut en représenter, complémentairement, de 75% à 25%.The rotary sprayer P can be implemented according to a coating product spraying method according to the invention. Advantageously, the flow rate of the primary air jets J 4 and the flow rate of the secondary air jets J 6 represent respectively 33% and 67% of the total air flow, which can be between 100 NL/min and 1000 NL/ min, preferably between 300 NL/min and 800 NL/min. In practice, the flow rate of the primary air jets J 4 can represent from 25% to 75% of the total air flow and the secondary air flow J 6 can represent, additionally, from 75% to 25%.

De telles conditions de fonctionnement, en particulier une telle répartition des débits de jets d'air primaires J4 et de jets secondaires J6, permet d'optimiser le rendement de dépôt et la robustesse des impacts du produit de revêtement sur l'objet à revêtir.Such operating conditions, in particular such a distribution of the flow rates of primary air jets J 4 and of secondary jets J 6 , make it possible to optimize the yield of deposition and the robustness of the impacts of the coating product on the object to be put on.

Selon une variante non représentée, les contours primaire et secondaire peuvent être disposés dans deux plans distincts. En particulier, les contours primaire et secondaire peuvent être disposés dans deux plans distincts sur une surface globalement tronconique qui s'étend dans la partie aval du corps fixe et autour de l'axe de rotation du bol. Plus généralement, le contour primaire et/ou le contour secondaire peu(ven)t ne pas être plan(s).According to a variant not shown, the primary and secondary contours can be arranged in two separate planes. In particular, the primary and secondary contours can be arranged in two distinct planes on a generally frustoconical surface which extends in the downstream part of the fixed body and around the axis of rotation of the bowl. More generally, the primary contour and/or the secondary contour may not be flat.

Selon une autre variante non représentée, le corps fixe du projecteur rotatif peut comprendre des orifices supplémentaires destinés à émettre des jets d'air orientés différemment des jets d'air primaires et secondaires. Par ailleurs, le corps fixe peut comprendre des orifices supplémentaires qui sont positionnés différemment des orifices primaires et secondaires. De tels orifices supplémentaires ne sont pas nécessairement configurés pour produire des jets combinés, mais ils peuvent remplir d'autres fonctions.According to another variant not shown, the fixed body of the rotary headlamp may comprise additional orifices intended to emit air jets oriented differently from the primary and secondary air jets. Furthermore, the fixed body may comprise additional orifices which are positioned differently from the primary and secondary orifices. Such additional orifices are not necessarily configured to produce combined jets, but they may perform other functions.

Claims (13)

  1. A rotary spray device (P) for coating product, comprising:
    - a coating product spray member (1) having at least one roughly circular edge (12) and able to form a jet of coating product,
    - means for driving the rotation of the spray member (1), and
    - a body (2) which is fixed and which comprises:
    • primary orifices (4) arranged on a primary contour (C4) surrounding the axis of rotation (X1) of the spray member (1), each primary orifice (4) being intended to eject a jet of primary air (J4) in a primary direction (X4),
    • secondary orifices (6) arranged on a secondary contour (C6) surrounding the axis of rotation (X1) of the spray member (1), each secondary orifice (6) being intended to eject a jet of secondary air (J6) in a secondary direction (X6),
    the primary contour (C4) and the secondary contour (C6) being each of circular shape and coinciding in a circle (C) centered on the axis of rotation (X1),
    the respective orientations of each primary direction (X4) and of each secondary direction (X6) and the respective positions of each primary orifice (4) and of each secondary orifice (6) causing the formation of combined jets (J46) each resulting from the intersection of at least one jet of primary air (J4) and at least one jet of secondary air (J6) which are associated with one another,
    characterized in that the region of intersection (R46)lies upstream of the edge (12), and in that the ratio between the diameter (D12) of the edge (12) and the diameter (D) of the circle (C) is between 0.65 and 1 and preferably being equal to 0.95.
  2. The rotary spray device (P) as claimed in claim 1, characterized in that each primary direction (X4) and the spray member (1) are separate and in that each secondary direction (X6) is secant to the spray member (1).
  3. The rotary spray device (P) as claimed in claim 2, characterized in that each secondary direction (X6) extends in a plane containing the axis of rotation (X1), and in that the secondary directions (X6) roughly converge toward a vertex (S6) lying on the axis of rotation (X1).
  4. The rotary spray device (P) as claimed in one of the preceding claims, characterized in that the primary orifices (4) and the secondary orifices (6) are respectively positioned on the primary contour (C4) and on the secondary contour (C6) so as to cause two adjacent combined jets (J46, J46) to mix partially.
  5. The rotary spray device (P) as claimed in one of the preceding claims, characterized in that all of the primary directions (X4) and all of the secondary directions (X6) respectively display symmetry with respect to the axis of rotation (X1).
  6. The rotary spray device (P) as claimed in one of the preceding claims, characterized in that the distance (L1) between the primary contour (C4) and the edge (12), considered along the axis of rotation (X1), is between 5 mm and 30 mm, and in that the distance (L1) between the secondary contour (C6) and the edge (12), considered along the axis of rotation (X1), is between 5 mm and 30 mm.
  7. The rotary spray device (P) as claimed in one of the preceding claims, characterized in that the primary contour (C4) and the secondary contour (C6) are located in a common plane (P46), the common plane (P46) being perpendicular to the axis of rotation (X1).
  8. The rotary spray device (P) as claimed in claim 11, characterized in that the body (2) comprises between 20 and 60 primary orifices (4) and between 20 and 60 secondary orifices (6), in that the primary orifices (4) and the secondary orifices (6) are circular, in that the primary orifices (4) are arranged on the circle (6) such that they alternate with the secondary orifices (6), and in that the diameter (d4) of the primary orifices (4) and the diameter (d6) of the secondary orifices (6) range between 0.4 mm and 1.2 mm and are preferably both equal to 0.8 mm.
  9. The rotary spray device (P) as claimed in one of claims 1 to 7, characterized in that each primary orifice (4) and the associated secondary orifice (6) are separated by a distance (C46) between 0 mm and 10 mm, preferably equal to 1 mm.
  10. The rotary spray device (P) as claimed in claim 7, characterized in that a primary direction (X4) and an associated secondary direction (X6) meet at a meeting point (46), the distance along the axis of rotation (X1) between the common plane (P46) and the meeting point (46) ranging between 0.5 times and 30 times, preferably between once and twice, the longest dimension (d4, d6) of the primary (4) or secondary (6) orifices considered in the common plane (P46) .
  11. The rotary spray device (P) as claimed in one of the preceding claims, characterized in that each combined jet (J46) has a cross section in the plane of the edge (12) which is roughly in the shape of an ellipse (E46) truncated by the edge (12), the major axis (X46) of the ellipse (E46) being inclined with respect to a direction (T12) locally tangential to the edge (12) by an angle (A46) of between 20° and 70° and preferably of between 35° and 55°.
  12. The rotary spray device (P) as claimed in claim 2, taken alone or in combination with one of claims 3 to 9, characterized in that the primary directions (X4) pass at a non-zero radial distance (r4) from the edge (12) which less than 25 mm and preferably equal to 5 mm, and in that the secondary directions (X6) intersect the spray member (1) at an axial distance (L136) from the edge (12) which is between 0 mm and 25 mm and preferably equal to 3.5 mm.
  13. A method of spraying a coating product, characterized in that it implements a rotary spray device (P) as claimed in one of claims 1 to 12, with a total air flow rate of between 100 Nl/min and 1000 Nl/min, preferably between 300 Nl/min and 800 Nl/min and containing from 25% to 75%, preferably 33%, of flow rate from the jets of primary air (J4) and 75% to 25%, preferably 67%, of flow rate from the jets of secondary air (J6).
EP09753160.2A 2008-09-30 2009-09-30 Rotary spray device and method of spraying coating product using such a rotary spray device Active EP2328689B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09753160.2T PL2328689T5 (en) 2008-09-30 2009-09-30 Rotary spray device and method of spraying coating product using such a rotary spray device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0856607A FR2936434B1 (en) 2008-09-30 2008-09-30 ROTARY PROJECTOR AND METHOD FOR PROJECTING A COATING PRODUCT USING SUCH A ROTARY PROJECTOR
PCT/FR2009/051859 WO2010037972A1 (en) 2008-09-30 2009-09-30 Rotary spray device and method of spraying coating product using such a rotary spray device

Publications (3)

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EP2328689A1 EP2328689A1 (en) 2011-06-08
EP2328689B1 EP2328689B1 (en) 2014-02-26
EP2328689B2 true EP2328689B2 (en) 2022-11-16

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EP (1) EP2328689B2 (en)
JP (1) JP5628179B2 (en)
KR (1) KR101688936B1 (en)
CN (1) CN102170972B (en)
BR (1) BRPI0913688B1 (en)
DE (1) DE202009019107U1 (en)
ES (1) ES2452298T5 (en)
FR (1) FR2936434B1 (en)
PL (1) PL2328689T5 (en)
RU (1) RU2502566C2 (en)
WO (1) WO2010037972A1 (en)

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KR101688936B9 (en) 2024-01-08
RU2502566C2 (en) 2013-12-27
DE202009019107U1 (en) 2016-07-17
WO2010037972A1 (en) 2010-04-08
CN102170972B (en) 2014-05-21
ES2452298T3 (en) 2014-03-31
JP2012504040A (en) 2012-02-16
EP2328689A1 (en) 2011-06-08
US8973850B2 (en) 2015-03-10
ES2452298T5 (en) 2023-03-13
US20110210180A1 (en) 2011-09-01
BRPI0913688A2 (en) 2015-10-13
PL2328689T5 (en) 2023-04-11
PL2328689T3 (en) 2014-08-29
BRPI0913688B1 (en) 2019-11-19
CN102170972A (en) 2011-08-31
KR20110084206A (en) 2011-07-21
KR101688936B1 (en) 2016-12-22
RU2011117173A (en) 2012-11-10
FR2936434A1 (en) 2010-04-02
EP2328689B1 (en) 2014-02-26
FR2936434B1 (en) 2014-07-25
JP5628179B2 (en) 2014-11-19

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