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EP2361157B1 - Coating material ejector - Google Patents

Coating material ejector Download PDF

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Publication number
EP2361157B1
EP2361157B1 EP09801733.8A EP09801733A EP2361157B1 EP 2361157 B1 EP2361157 B1 EP 2361157B1 EP 09801733 A EP09801733 A EP 09801733A EP 2361157 B1 EP2361157 B1 EP 2361157B1
Authority
EP
European Patent Office
Prior art keywords
atomizer
channels
outlet
axis
belonging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09801733.8A
Other languages
German (de)
French (fr)
Other versions
EP2361157A1 (en
Inventor
Samuel Callendret
Olivier Gourbat
Sylvain Perinet
Patrick Ballu
Franck Gerstch
David Vincent
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sames Kremlin SAS
Original Assignee
Sames Technologies SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to PL09801733T priority Critical patent/PL2361157T3/en
Publication of EP2361157A1 publication Critical patent/EP2361157A1/en
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Publication of EP2361157B1 publication Critical patent/EP2361157B1/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
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the present invention relates to a rotary coating product projector having outlet channels distributed about the spray axis so as to eject air to form the coating product stream.
  • coating product means any product, in liquid or powder form, intended to be projected to an object to be coated, for example a primer, paint or varnish.
  • US-A-4,776,520 discloses a rotating liquid paint projector comprising a body comprising a main internal portion and an outer portion fixed on the inner part, in this case by screwing.
  • the rotating projector of US-A-4,776,520 further comprises a spraying member of the coating product and a turbine.
  • the spraying member is arranged at a downstream end of the body so as to form a paint jet, when it is rotated by the turbine.
  • Outlet channels are provided in the body, uniformly about the axis of rotation.
  • the exit channels have the function of ejecting air to conform the spray of paint, these air jets are usually called "skirt" air.
  • the rotating projector also has an exit chamber that is formed in the body and extends around the axis of rotation. The output chamber communicates with each output channel. Upstream of the outlet chamber, an inlet pipe is formed in the body so as to supply compressed air to the outlet chamber, and thus to the outlet channels.
  • JP-A-09192545 which discloses the features of the preamble of claim 1, to use two intermediate chambers in the flow path of the skirt air, but this flow can remain asymmetrical output.
  • the present invention aims in particular to remedy these drawbacks, by proposing a rotating projector achieving a controlled distribution, for example of Equal and symmetrical way of skirt air around the spray axis, with limited air consumption.
  • the two chambers and the intermediate channels make it possible to distribute the flow of air towards the outlet chamber, in a controlled manner, around the spraying axis.
  • the figure 1 shows a rotating projector P, for the projection of liquid coating product, which comprises a spraying member of the coating product, hereinafter referred to as bowl 1 according to its usual name given due to its shape.
  • the bowl 1 is arranged at a downstream end of a body 50.
  • the bowl 1 is shown in a spray position, where it is rotated at high speed around an axis X 1 by drive means comprising a compressed air turbine T, whose envelope is symbolized in phantom on the figure 1 .
  • the axis X 1 thus constitutes the axis of rotation of the bowl 1.
  • the axis X 1 forms a spraying axis for the projector P.
  • the body 50 is fixed, that is to say, it does not rotate around the axis X 1 .
  • the body 50 can be mounted on a base 60 of the projector P which is partially symbolized in phantom at the figure 1 and which is itself intended to be mounted on a wrist of a multiaxis robot arm not shown.
  • the body 50 comprises an inner portion 20 and an outer portion 70.
  • the outer portion 70 is usually called skirt.
  • the outer portion 70 and the inner portion 20 are integral, that is to say one-piece or attached to one another.
  • the outer portion 70 is in this case secured to the inner portion 20, for example by screwing.
  • the outer portion 70 generally has the shape of a truncated ogive converging towards the downstream end of the body 50.
  • the adjective “internal” designates an element relatively close to the axis X 1 or oriented towards the axis X 1
  • the adjective “external” designates an element that is further away or oriented from opposite to the X axis 1
  • the adjective “proximal” designates an element relatively close to the base 60
  • the adjective “distal” designates an element that is more distant.
  • the bowl 1 has a concave shape which has a symmetry of revolution about the axis X 1 .
  • the bowl 1 makes it possible to spray the coating product into fine droplets. All of these droplets form a jet of product J 1 , shown in phantom at the figure 1 , which leaves the bowl 1 and goes to an object to be coated, not shown, on which the jet of product J 1 forms an impact.
  • the projector P has outlet channels 41 which are distributed around the axis X 1 and which open at the downstream end of the body 50 on orifices 42. In operation, it leaves a air jet J 1 of each orifice 42 extending an outlet channel 41.
  • the jets of air J 1 make it possible to conform the jet of product J 1 and to guide it towards the object to be coated.
  • Each outlet channel 41 is formed in the body 50, that is to say in the inner portion 20 or in the outer portion 70. In this case, each outlet channel 41 is drilled in the downstream portion of the portion In practice, each output channel can be made differently.
  • an outlet chamber 324 is formed, at the downstream end of the inner portion 20, between the inner portion 20 and the outer portion 70.
  • the outlet chamber 324 has a shape rotationally symmetrical ring which extends around the axis X 1 and just upstream of the outlet channels 41.
  • the outlet chamber 324 communicates with the outlet channels 41.
  • the projector P has two inlet ducts 201 and 202 which are formed in the body 50 so as to supply air to the outlet chamber 324, and thus to the outlet channels 42.
  • the terms "input”, “output”, “upstream” and “downstream” are used by reference to the general direction of flow of compressed air in the projector P, from the interface between the projector P and the base 60, which defines an upstream input, to the output channels 42 which define downstream outputs.
  • the inner portion 20 is generally composed of a proximal portion 203 of substantially cylindrical shape with a circular base of axis X 1 , and a distal portion 204 of generally frustoconical shape and whose size is smaller than that of the portion 203.
  • the inner portion 20 is tubular so as to house the turbine T.
  • chamber means an enclosure, that is to say a hollow volume and entirely delimited by walls. Such a chamber has openings for the entry and exit of fluid respectively in and out of the chamber.
  • connection refers to the communication of fluid, in particular compressed air, that is to say to a link that allows a fluid, gaseous or liquid, to flow or flow between two or more points or parts.
  • a link can be direct or indirect, that is to say realized by a pipe, a pipe, a pipe and so on.
  • nouns derived from these verbs, such as “connection” and “connection” relate to such fluid communication.
  • feed refers to a flow of fluid, in particular compressed air.
  • the inlet ducts 201 and 202 extend through the thickness of the proximal portion 203 and along the axis X 1 .
  • the inlet ducts 201 and 202 are here diametrically opposite with respect to the axis X 1 .
  • the inlet ducts may occupy other angular positions around the spray axis.
  • the inlet pipes 201 are connected to a compressed air supply pipe not shown.
  • each intermediate chamber 210, 230 or 250 has a generally annular shape with a circular base around the axis X 1 .
  • each intermediate chamber 210, 230 or 250 extends around the axis X 1 .
  • Each room intermediate 210, 230 or 250 is formed between the inner portion 20 and the outer portion 70.
  • the inlet pipe 201 opens into the intermediate chamber 210 which is the furthest axially from the bowl 1.
  • the intermediate chambers 210, 230 and 250 are parallel to each other.
  • the intermediate chambers 210 and 230 are separated by a first rib 220 which has a generally annular shape with a circular base around the axis X 1 .
  • the intermediate chambers 230 and 250 are separated by a second rib 240 which has a generally annular shape with a circular base around the axis X 1 .
  • the outer diameter of the first rib 220 and the second rib 240 corresponds to the outer diameter of the proximal portion 203 and the inner diameter of the outer portion 70.
  • the outer radial surfaces of the first rib 220 and the second rib 240 bear against the inner cylindrical surface of the outer portion, which makes their interface substantially airtight.
  • first rib 220 In the first rib 220 are formed four intermediate channels 221, 222, 223 and 224, visible to the Figures 4 and 5 and, for two of them, to figures 2 and 3 . These four intermediate channels 221 to 224 extend parallel to the axis X 1 between the intermediate chambers 210 and 230. These four intermediate channels 221 to 224 thus open on the one hand into the intermediate chamber 210 and, on the other hand, In practice, the intermediate channels extend in an axial component direction, this direction possibly being non-parallel to the spray axis.
  • each intermediate channel 241, 242, 243, 244, 245, 246, 247 or 248 therefore opens into the intermediate chamber 230 and in the intermediate chamber 250.
  • Intermediate channels 221 to 224 form a first set of intermediate channels.
  • the intermediate chambers 210 and 230 are thus connected by the first set of intermediate channels, namely the intermediate channels 221 to 224.
  • the intermediate channels 241 to 248 form a second set of intermediate channels.
  • the intermediate chambers 230 and 250 are thus connected by the second set of intermediate channels, namely the intermediate channels 241 to 248.
  • two intermediate chambers juxtaposed along the axis X 1 are connected by a set of intermediate channels.
  • the ratio between the number of intermediate channels 241 to 248, which belong to the second set connecting the intermediate chambers 230 and 250, the axially closest to the bowl, and the number of intermediate channels 221 to 224, which belong to the first set connecting the chambers Intermediates 210 and 230, the furthest axially from the bowl, is here 2 because there are four intermediate channels 221 to 224 and eight intermediate channels 241 to 248.
  • this ratio between the numbers of intermediate channels belonging to the assemblies respectively connecting the two intermediate chambers axially closest to the bowl and the two intermediate chambers furthest from the bowl axially is between 1.5 and 10, preferably 2.
  • Each intermediate channel 221 to 224 and 241 to 248 is constituted by a notch which extends parallel to the axis X 1 . Each of these notches is formed by respective recess which is made recessed on the outer surface of the inner portion 20.
  • the intermediate channels 221 to 224 and 241 to 248 allow the flow of air between the intermediate chambers 210, 230 and 250 .
  • Each intermediate chamber 210, 230 or 250 is constituted by a groove whose cross section to the axis X 1 is tubular with a circular base. Each of these grooves is formed by a respective recess which is hollowed out on the outer surface of the inner portion 20.
  • the intermediate chambers 210, 230 and 250 conduct the flow of air between the inlet pipe 201 and pipes output 261, 262, 263, 268 and equivalents described hereinafter.
  • the outer portion 70 has a shape generally complementary to the shape of the inner portion 20. These complementary shapes of the outer portion and the inner portion 20 are determined so that the outer portion completely covers each of the recesses of the inner portion 20, that is to say each intermediate chamber 210, 230 or 250 and each intermediate channel 241 to 248. In other words, the intermediate chambers 210, 230 and 250 and the intermediate channels 221 to 224 and 241 to 248 are thus formed between the inner portion 20 and the outer portion 70.
  • the rotating projector P has eight outlet pipes, four of which are visible at figures 2 and 3 with references 261, 262, 263 and 268.
  • each outlet line 261, 262, 263, 268 or equivalent extends into the inner portion 20, between the outlet chamber 324 and the intermediate chamber 250 which is the closest axially of the bowl 1.
  • the outlet ducts 261, 262, 263, 268 and equivalents are distributed uniformly around the axis X 1 .
  • each outlet pipe 261, 262, 263, 268 or equivalent is composed of a radial section 268.1 and an axial section 268.2 which are drilled in the distal portion 204.
  • the radial and axial sections of the outlet pipes 261, 262 , 263, 268 and the like are cylindrical and have diameters respectively identical to each other.
  • the body 50 is structured so as to equalize the air pressures prevailing around the axis X 1 in the outlet chamber 324.
  • the intermediate channels of the same set are distributed around the axis X 1 .
  • “Distributed” means intermediate channels distributed over the entire circumference of the first rib 220 or the second rib 240. In other words, the intermediate channels of the same set are not concentrated in a narrow angular sector, but instead "spread" around the axis X 1 .
  • the intermediate channels 221 to 224 or 241 to 248 of the same set are uniformly distributed around the axis X 1 , so that two intermediate channels successive ones in a circumferential direction are separated by a constant angle.
  • Two intermediate channels 221 to 224 neighbors form an angle A of about 90 °.
  • the angle A is between 60 ° and 120 °.
  • Two intermediate channels 241 to 248 neighbors form an angle B of about 45 °.
  • the angle B is between 30 ° and 60 °.
  • the number of output lines 261, 262, 263, 268 and equivalents namely eight, is here equal to the number of intermediate channels 241 to 248 belonging to the second set which connect the intermediate chambers 230 and 250, which are the closest axially of the bowl 1.
  • the ratio between the number of outlet pipes 261, 262, 263, 268 and equivalents and the number of intermediate channels 241 to 248 is therefore 1.
  • the number of outlet ducts is greater than or equal to four and the ratio between the number of outlet ducts and the number of intermediate ducts belonging to the assembly connecting the two intermediate chambers closest axially to the control unit.
  • spray that is to say the "downstream" set
  • This ratio is 0.25 when, for example, there are four outlet pipes and thirty-two intermediate channels belonging to the "downstream” assembly.
  • Such a ratio makes it possible to equalize the air pressures in the intermediate chamber 250, that is to say upstream of the outlet pipes 261, 262, 263, 268 and equivalent.
  • the intermediate channels of the same set, first or second have substantially identical flow sections.
  • each intermediate channel 221 to 224 is approximately rectangular, of width l 221 and height h 221 .
  • the width l 221 is about 4 mm.
  • the height h 221 is approximately 2 mm.
  • the intermediate channels 241 to 248 of the second set have flow sections identical to each other, of approximately rectangular shape, of width L 242 and height H 242 .
  • the intermediate channels of the same set may have any shape.
  • FIG 3 illustrates the air flows by curved arrows.
  • a rotating projector according to the invention makes it possible to evenly distributing pressures and airflows from the inlet lines 201 and 202 to the outlet chamber 324.
  • the intermediate channels 221 to 224 of the first set occupy symmetrical angular positions around the axis X 1 , since they are separated successively by the constant angle A in pairs.
  • the intermediate channels 241 to 248 of the second set occupy symmetrical angular positions around the axis X 1 , because they are separated successively by the constant angle B in pairs.
  • the intermediate channels 221 to 224 each occupy an angular position which is offset from the inlet line 201.
  • the inlet line 201 and one of the intermediate channels 221 to 224 form an angle C on the axis X 1 non-zero and which is about 45 °.
  • the angular position of an intermediate channel is defined in a plane orthogonal to the axis X 1 and with reference to a substantially median axis of this intermediate channel, such an axis being represented in phantom on the Figures 4 and 5
  • the intermediate channels 241 to 248 each occupy an angular position offset from the intermediate channels 221 to 224.
  • an intermediate channel 241 to 248 and an intermediate channel 221 to 224 neighbors form an angle D on the axis X 1 not zero and which is about 22.5 °.
  • the intermediate chambers 210, 230 and 250 and the intermediate channels 221 to 224 and 241 to 248 define a kind of labyrinth which forces the air injected by the inlet pipe 201 to be distributed uniformly about the axis X 1 .
  • the total flow section of the outlet channels 42 is greater than or equal to the total flow section of the inlet pipes 201 and 202. In addition, the total flow section of the outlet channels is greater than or equal to a total flow section.
  • flow section is meant the section through which compressed air can flow.
  • total flow section is meant the sum of the unit flow sections of several elements identical to each other, such as the intermediate channels of the same set or the outlet pipes.
  • the total flow section increases, from upstream to downstream, to each "flow" component of the labyrinth, which limits the pressure drops and avoids a local increase in air pressure which tends to unbalance the air in the air. skirt.
  • the total flow section or .h 4.l 221 221, of the intermediate channels 221 to 224 of the first set, which connects the intermediate chambers 210 and 230 farthest axially from the bowl 1 is smaller than the flow section 8.
  • the rotating projector further comprises an air deflection member which is located in the outlet chamber 324 and which also improves the uniformity of the air pressures around the axis X 1 .
  • the body represented Figures 2 to 5 has three intermediate chambers 210, 230 and 250.
  • the number of intermediate chambers is between three and eight.
  • the figure 6 and 7 show a part of a variant to the projector of Figures 1 to 5 , this variant not forming part of the invention, wherein the body comprises a single inlet pipe 601 and two juxtaposed chambers.
  • the first set of intermediate channels then comprises two intermediate channels 621 and 622 which are diametrically opposed and which are offset, in a plane transverse to the spraying axis X 6 , by an angle C 6 , similar to the angle C, approximately 90 ° with respect to the inlet line 601.
  • the second set of intermediate channels comprises four intermediate channels 641, 642, 643 and 644 separated in pairs from an angle B 6 , similar to the angle B, about 90 ° and angularly distributed between the intermediate channels 621 and 622 of the first set, the angle of offset D 6 analogous to the angle D is about 45 °.
  • the angle of offset D 6 analogous to the angle D is about 45 °.
  • a projector according to the invention comprises at least one ring movable in rotation about the spray axis.
  • Such a movable ring makes it possible to adjust the relative angular position of the intermediate channels of this assembly with respect to the channels of a juxtaposed assembly, typically the angle D or D 6 .
  • it controls the distribution of skirt air flow around the spray axis.
  • intermediate channels are placed opposite other intermediate channels, an unequal and controlled distribution of the air flows around the spray axis is obtained. It is thus possible to generate a skirt air of globally elliptical shape and no longer circular, as in the variant illustrated in FIGS. Figures 1 to 7 . It is also possible to provide several rotating rings independently of each other, to adjust the skirt air flow rates.
  • the body may comprise a plurality of intermediate chambers in the form of annular portions disjoint around the axis of rotation.
  • the grooves and notches which respectively form the intermediate chambers and the intermediate channels are formed in the outer part of the body, such as the outer part 70.
  • the intermediate chambers and the intermediate channels are then covered by the part internal form globally complementary to the external part.
  • the projector comprises two or more inlet pipes which respectively inject compressed air into separate intermediate chambers, for example the furthest axially from the bowl and that which is juxtaposed with it.
  • inlet ducts are in any case intended to supply air to the outlet channels, such as the inlet ducts 201 and 202.
  • the intermediate channels of the same set may have different respective flow sections.
  • the respective debiting sections of each intermediate channel is determined as a function of the distance between the respective intermediate channel and the air inlet, input line or upstream intermediate channel, the nearest.
  • an intermediate channel may have a debiting section greater than that of its neighbor overall, especially if it is placed further from the air inlet. Such dimensioning ensures a relatively uniform distribution of air flows flowing in the intermediate channels of the same set.
  • the intermediate chambers and the intermediate channels are formed in one or more porous part (s), composed of one or more porous material (s), such as a polymer foam, a sintered piece of plastic or metal material or any other material of sufficient porosity, the cavities and the connections between them form the intermediate chambers and the successive intermediate channels.
  • This porous piece is attached to a non-porous part, such as the inner part 20 mentioned above.
  • the intermediate chambers and the intermediate channels may then have irregular geometries, since they respectively consist of cavities or porosities of the porous part.
  • the porosity of the part is expected to be less important near the pipe (s) of entry and more important far from the pipe (s). (s) entry.
  • the invention is also applicable in the case of a projector comprising several groups of output channels, each ejecting a generally annular skirt air.
  • a projector then comprises two disjoint groups each comprising one or more inlet ducts, at least two intermediate chambers, sets of intermediate ducts, outlet ducts and outlet ducts.
  • the invention has been shown with a rotary sprayer provided with a bowl 1 rotating about the axis X 1 . However, it is applicable to a sprayer or a fixed nozzle projector, this nozzle being centered on a spraying axis. Although described with reference to a liquid product projector, the invention is applicable to powder product projectors.

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  • Electrostatic Spraying Apparatus (AREA)

Description

La présente invention concerne un projecteur rotatif de produit de revêtement comportant des canaux de sorties répartis autour de l'axe de pulvérisation de façon à éjecter de l'air pour conformer le jet de produit de revêtement.The present invention relates to a rotary coating product projector having outlet channels distributed about the spray axis so as to eject air to form the coating product stream.

Dans la présente demande, par produit de revêtement on désigne tout produit, sous forme liquide ou pulvérulente, destiné à être projeté vers un objet à revêtir, par exemple un apprêt, une peinture ou un vernis.In the present application, coating product means any product, in liquid or powder form, intended to be projected to an object to be coated, for example a primer, paint or varnish.

US-A-4 776 520 décrit un projecteur rotatif de peinture liquide comportant un corps comprenant une partie interne principale et une partie externe fixée sur la partie interne, en l'occurrence par vissage. Le projecteur rotatif de US-A-4 776 520 comporte en outre un organe de pulvérisation du produit de revêtement et une turbine. L'organe de pulvérisation est agencé à une extrémité aval du corps de façon à former un jet de peinture, lorsqu'il est entraîné en rotation par la turbine. Des canaux de sortie sont ménagés dans le corps, uniformément autour de l'axe de rotation. Les canaux de sortie ont pour fonction d'éjecter de l'air pour conformer le jet de peinture, ces jets d'air sont usuellement appelés air « de jupe ». Le projecteur rotatif comporte aussi une chambre de sortie qui est formée dans le corps et qui s'étend autour de l'axe de rotation. La chambre de sortie communique avec chaque canal de sortie. En amont de la chambre de sortie, une conduite d'entrée est ménagée dans le corps de façon à alimenter en air comprimé la chambre de sortie, donc les canaux de sortie. US-A-4,776,520 discloses a rotating liquid paint projector comprising a body comprising a main internal portion and an outer portion fixed on the inner part, in this case by screwing. The rotating projector of US-A-4,776,520 further comprises a spraying member of the coating product and a turbine. The spraying member is arranged at a downstream end of the body so as to form a paint jet, when it is rotated by the turbine. Outlet channels are provided in the body, uniformly about the axis of rotation. The exit channels have the function of ejecting air to conform the spray of paint, these air jets are usually called "skirt" air. The rotating projector also has an exit chamber that is formed in the body and extends around the axis of rotation. The output chamber communicates with each output channel. Upstream of the outlet chamber, an inlet pipe is formed in the body so as to supply compressed air to the outlet chamber, and thus to the outlet channels.

On constate une répartition inégale, autour de l'axe de rotation, des débits d'air de jupe s'écoulant dans chacun des canaux de sortie. En effet, une seule conduite d'entrée amène l'air dans la chambre de sortie annulaire. Or, cette chambre de sortie annulaire génère des pertes de charge qui augmentent avec la distance à la conduite d'entrée. Cette répartition inégale des débits d'air risque, si elle n'est pas maîtrisée, de provoquer une dissymétrie non voulue dans le jet de produit de revêtement, donc dans l'épaisseur de la couche de produit de revêtement déposée sur l'objet à revêtir, en particulier lorsque le projecteur rotatif se déplace en regard de l'objet à revêtir.There is an uneven distribution around the axis of rotation of skirt air flow flowing in each of the outlet channels. Indeed, a single inlet conduit brings the air into the annular outlet chamber. However, this annular outlet chamber generates pressure losses that increase with the distance to the inlet pipe. This uneven distribution of air flow rates, if not controlled, may cause an unintended dissymmetry in the coating product jet, and therefore in the thickness of the layer of coating product deposited on the object to be deposited. cover, especially when the rotating searchlight is moving opposite the object to be coated.

Il est également connu de JP-A-09192545 , qui révèle les caractéristiques de la préambule de la revendication 1, d'utiliser deux chambres intermédiaires sur le trajet d'écoulement de l'air de jupe, mais cet écoulement peut demeurer dissymétrique en sortie.It is also known to JP-A-09192545 , which discloses the features of the preamble of claim 1, to use two intermediate chambers in the flow path of the skirt air, but this flow can remain asymmetrical output.

La présente invention vise notamment à remédier à ces inconvénients, en proposant un projecteur rotatif réalisant une répartition maîtrisée, par exemple de façon égale et symétrique de l'air de jupe autour de l'axe de pulvérisation, avec une consommation d'air limitée.The present invention aims in particular to remedy these drawbacks, by proposing a rotating projector achieving a controlled distribution, for example of Equal and symmetrical way of skirt air around the spray axis, with limited air consumption.

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

  • un corps comprenant une partie interne et une partie externe ;
  • un organe de pulvérisation du produit de revêtement, agencé à une extrémité aval du corps pour former un jet de produit de revêtement, l'organe de pulvérisation étant centré sur un axe de pulvérisation ;
  • des canaux de sortie répartis autour de l'axe de pulvérisation, chaque canal de sortie étant ménagé dans le corps de façon à éjecter de l'air pour conformer le jet de produit de revêtement ;
  • au moins une chambre de sortie formée entre la partie interne et la partie externe, la chambre de sortie s'étendant autour de l'axe de pulvérisation, la chambre de sortie communiquant avec les canaux de sortie ;
  • au moins une conduite d'entrée ménagée dans le corps, la conduite d'entrée étant destinée à alimenter en air les canaux de sortie.
  • au moins deux chambres intermédiaires juxtaposées suivant l'axe de pulvérisation, chaque chambre intermédiaire étant formée entre la partie interne et la partie externe, chaque chambre intermédiaire s'étendant autour de l'axe de pulvérisation, au moins une conduite d'entrée communiquant avec la chambre intermédiaire la plus éloignée axialement de l'organe de pulvérisation ;
  • des canaux intermédiaires formés entre la partie interne et la partie externe, deux chambres intermédiaires juxtaposées étant reliées par un ensemble de canaux intermédiaires, les canaux intermédiaires d'un même ensemble étant répartis autour de l'axe de pulvérisation ;
  • des conduites de sortie s'étendant entre la chambre intermédiaire la plus proche axialement de l'organe de pulvérisation et la chambre de sortie, les conduites de sortie étant réparties autour de l'axe de pulvérisation.
For this purpose, the subject of the invention is a coating product projector comprising:
  • a body comprising an inner portion and an outer portion;
  • a spraying member of the coating material, arranged at a downstream end of the body to form a coating product stream, the spraying member being centered on a spraying axis;
  • outlet channels distributed about the spray axis, each outlet channel being formed in the body so as to eject air to form the coating product stream;
  • at least one exit chamber formed between the inner portion and the outer portion, the exit chamber extending about the spray axis, the exit chamber communicating with the exit channels;
  • at least one inlet pipe formed in the body, the inlet pipe being intended to supply air to the outlet channels.
  • at least two intermediate chambers juxtaposed along the spraying axis, each intermediate chamber being formed between the inner part and the outer part, each intermediate chamber extending around the spraying axis, at least one inlet pipe communicating with the intermediate chamber farthest axially from the spray member;
  • intermediate channels formed between the inner portion and the outer portion, two juxtaposed intermediate chambers being connected by a set of intermediate channels, the intermediate channels of the same set being distributed around the spray axis;
  • outlet ducts extending between the axially nearest intermediate chamber of the spraying member and the outlet chamber, the outlet ducts being distributed around the spraying axis.

Le projecteur se caractérise en ce que :

  • il comporte entre trois et huit chambres intermédiaires juxtaposées suivant l'axe de pulvérisation et
  • les canaux intermédiaires appartenant à un même ensemble occupent des positions angulaires autour de l'axe de pulvérisation qui sont décalées angulairement autour de l'axe de pulvérisation par rapport aux canaux intermédiaires appartenant à un ensemble juxtaposé.
The projector is characterized in that:
  • it comprises between three and eight intermediate chambers juxtaposed along the spraying axis and
  • the intermediate channels belonging to the same set occupy angular positions around the spray axis which are angularly offset about the spray axis relative to the intermediate channels belonging to a juxtaposed set.

Grâce à l'invention, les deux chambres et les canaux intermédiaires permettent de répartir l'écoulement d'air vers la chambre de sortie, de façon maîtrisée, autour de l'axe de pulvérisation.Thanks to the invention, the two chambers and the intermediate channels make it possible to distribute the flow of air towards the outlet chamber, in a controlled manner, around the spraying axis.

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

  • le rapport entre le nombre de conduites de sortie et le nombre de canaux intermédiaires appartenant à l'ensemble reliant les deux chambres intermédiaires les plus proches axialement de l'organe de pulvérisation est supérieur ou égal à 0,25 ;
  • le nombre de conduites de sortie est supérieur ou égal à 4, de préférence à 8 ;
  • les canaux intermédiaires appartenant à un même ensemble sont répartis autour de l'axe de pulvérisation et les conduites de sortie sont réparties autour de l'axe ;
  • le nombre de conduites de sortie est supérieur à 4, de préférence égal à 8 ; le rapport entre le nombre de canaux intermédiaires appartenant à l'ensemble reliant les deux chambres intermédiaires les plus proches axialement de l'organe de pulvérisation et le nombre de canaux intermédiaires appartenant à l'ensemble reliant les deux chambres intermédiaires les plus éloignées axialement de l'organe de pulvérisation est compris entre 1,5 et 10, de préférence égal à 2 ;
  • une section débitante totale des canaux intermédiaires appartenant à un ensemble reliant deux chambres intermédiaires éloignées axialement de l'organe de pulvérisation est inférieure ou égale à une section débitante totale des canaux intermédiaires appartenant à un ensemble reliant deux chambres intermédiaires plus proches axialement de l'organe de pulvérisation ;
  • les canaux intermédiaires d'un même ensemble ont des sections débitantes respectives sensiblement identiques et les conduites de sortie ont des sections débitantes respectives sensiblement identiques ;
la section débitante totale des conduites de sortie est supérieure ou égale à la section débitante totale de la ou des conduite(s) d'entrée, la section débitante totale des conduites de sortie est supérieure ou égale à une section débitante totale des canaux intermédiaires appartenant à un même ensemble et en ce qu'une section débitante totale des canaux intermédiaires appartenant à un même ensemble est supérieure ou égale à la section débitante totale de la ou des conduite(s) d'entrée ;
  • les chambres intermédiaires et la chambre de sortie présentent chacune une forme globalement annulaire à symétrie de révolution autour de l'axe de pulvérisation ;
  • chaque chambre intermédiaire est constituée par une gorge annulaire et chaque canal intermédiaire est constitué par une encoche s'étendant parallèlement à l'axe de pulvérisation ; chaque gorge et chaque encoche est formée par un évidement respectif réalisé en creux sur la partie interne et/ou sur la partie externe, et la partie externe et la partie interne ont des formes globalement complémentaires entre elles, de façon à recouvrir totalement chaque évidement ;
  • le projecteur comprend au moins une bague mobile en rotation autour de l'axe de pulvérisation et un ensemble de canaux intermédiaires est réalisé dans ladite bague mobile ;
  • chaque chambre intermédiaire et chaque canal intermédiaire sont formés par des cavités d'une pièce poreuse.
According to other advantageous but optional features of the invention, taken alone or in any technically permissible combination:
  • the ratio between the number of outlet ducts and the number of intermediate ducts belonging to the assembly connecting the two intermediate chambers axially closest to the spray member is greater than or equal to 0.25;
  • the number of outlet ducts is greater than or equal to 4, preferably 8;
  • the intermediate channels belonging to the same set are distributed around the spray axis and the outlet pipes are distributed around the axis;
  • the number of outlet ducts is greater than 4, preferably 8; the ratio between the number of intermediate channels belonging to the assembly connecting the two intermediate chambers axially closest to the atomizer member and the number of intermediate channels belonging to the assembly connecting the two intermediate chambers furthest away axially from the spraying member is between 1.5 and 10, preferably 2;
  • a total flow section of the intermediate channels belonging to an assembly connecting two intermediate chambers axially distant from the spray member is less than or equal to a total flow section of the intermediate channels belonging to an assembly connecting two intermediate chambers axially closer to the organ spraying;
  • the intermediate channels of one and the same assembly have respective substantially equal flow-rate sections and the outlet lines have respective substantially equal flow-rate sections;
the total flow section of the outlet pipes is greater than or equal to the total flow section of the inlet pipe (s); total discharge section of the outlet ducts is greater than or equal to a total debiting section of the intermediate ducts belonging to the same set and in that a total debiting section of the intermediate ducts belonging to the same set is greater than or equal to the total debiting section the entry pipe (s);
  • the intermediate chambers and the outlet chamber each have a generally annular shape with symmetry of revolution about the spray axis;
  • each intermediate chamber is constituted by an annular groove and each intermediate channel is constituted by a notch extending parallel to the spray axis; each groove and notch is formed by a respective hollow recess on the inner portion and / or the outer portion, and the outer portion and the inner portion have generally complementary shapes therebetween, so as to completely cover each recess;
  • the projector comprises at least one ring rotatable about the spray axis and a set of intermediate channels is formed in said movable ring;
  • each intermediate chamber and each intermediate channel are formed by cavities of a porous piece.

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 tronquée d'un projecteur rotatif conforme à un premier mode de réalisation de 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 en perspective avec arraché, selon un angle différent de celle de la figure 2, de la partie du projecteur de la figure 2 ;
  • la figure 4 est une coupe schématique de principe suivant le plan IV à la figure 2 ;
  • la figure 5 est une coupe schématique de principe suivant le plan V à la figure 2 ;
  • la figure 6 est une coupe analogue à la figure 4 faite dans un projecteur conforme à un deuxième mode de réalisation de l'invention ; et
  • la figure 7 est une coupe analogue à la figure 5 faite dans le projecteur de la figure 6.
The invention will be well understood and its advantages will also emerge in the light of the description which follows, given solely by way of nonlimiting example and with reference to the appended drawings, in which:
  • the figure 1 is a truncated perspective view of a rotating projector according to a first embodiment of the invention;
  • the figure 2 is a perspective view, on a larger scale and at an angle different from that of the figure 1 , part of the projector of the figure 1 ;
  • the figure 3 is a perspective view with ripped off, at an angle different from that of the figure 2 , from the projector part of the figure 2 ;
  • the figure 4 is a schematic sectional view along plane IV at the figure 2 ;
  • the figure 5 is a schematic sectional view along the plane V to the figure 2 ;
  • the figure 6 is a cut similar to the figure 4 made in a projector according to a second embodiment of the invention; and
  • the figure 7 is a cut similar to the figure 5 made in the projector of the figure 6 .

La figure 1 montre un projecteur rotatif P, pour la projection de produit de revêtement liquide, qui comporte un organe de pulvérisation du produit de revêtement, ci-après dénommé bol 1 selon son appellation usuelle donnée en raison de sa forme. Le bol 1 est agencé à une extrémité aval d'un corps 50. 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 comprenant une turbine T à air comprimé, dont l'enveloppe est symbolisée en traits mixtes sur la figure 1. L'axe X1 constitue donc l'axe de rotation du bol 1. L'axe X1 forme un axe de pulvérisation pour le projecteur P.The figure 1 shows a rotating projector P, for the projection of liquid coating product, which comprises a spraying member of the coating product, hereinafter referred to as bowl 1 according to its usual name given due to its shape. The bowl 1 is arranged at a downstream end of a body 50. The bowl 1 is shown in a spray position, where it is rotated at high speed around an axis X 1 by drive means comprising a compressed air turbine T, whose envelope is symbolized in phantom on the figure 1 . The axis X 1 thus constitutes the axis of rotation of the bowl 1. The axis X 1 forms a spraying axis for the projector P.

Le corps 50 est fixe, c'est-à-dire qu'il ne tourne pas autour de l'axe X1. Le corps 50 peut être monté sur une embase 60 du projecteur P qui est partiellement symbolisée en traits mixtes à la figure 1 et qui est elle-même destinée à être montée sur un poignet d'un bras de robot multiaxes non représenté. Le corps 50 comprend une partie interne 20 et une partie externe 70. La partie externe 70 est usuellement appelée jupe. La partie externe 70 et la partie interne 20 sont solidaires, c'est-à-dire monobloc ou rapportée l'une sur l'autre. La partie externe 70 est en l'occurrence solidarisée à la partie interne 20, par exemple par vissage. La partie externe 70 présente globalement la forme d'une ogive tronquée convergeant vers l'extrémité aval du corps 50.The body 50 is fixed, that is to say, it does not rotate around the axis X 1 . The body 50 can be mounted on a base 60 of the projector P which is partially symbolized in phantom at the figure 1 and which is itself intended to be mounted on a wrist of a multiaxis robot arm not shown. The body 50 comprises an inner portion 20 and an outer portion 70. The outer portion 70 is usually called skirt. The outer portion 70 and the inner portion 20 are integral, that is to say one-piece or attached to one another. The outer portion 70 is in this case secured to the inner portion 20, for example by screwing. The outer portion 70 generally has the shape of a truncated ogive converging towards the downstream end of the body 50.

Dans la présente demande, l'adjectif « interne » désigne un élément relativement proche de l'axe X1 ou orienté vers l'axe X1, tandis que l'adjectif « externe » désigne un élément qui en est plus éloigné ou orienté de façon opposée à l'axe X1. Dans la présente demande, l'adjectif « proximal » désigne un élément relativement proche de l'embase 60, tandis que l'adjectif « distal » désigne un élément qui en est plus éloigné.In the present application, the adjective "internal" designates an element relatively close to the axis X 1 or oriented towards the axis X 1 , while the adjective "external" designates an element that is further away or oriented from opposite to the X axis 1 . In the present application, the adjective "proximal" designates an element relatively close to the base 60, while the adjective "distal" designates an element that is more distant.

Le bol 1 a une forme concave qui présente une symétrie de révolution autour de l'axe X1. Comme cela est connu en soi, le bol 1 permet de pulvériser le produit de revêtement en fines gouttelettes. L'ensemble de ces gouttelettes forme un jet de produit J1, représenté en traits mixtes à la figure 1, qui quitte le bol 1 et se dirige vers un objet à revêtir, non représenté, sur lequel le jet de produit J1 forme un impact.The bowl 1 has a concave shape which has a symmetry of revolution about the axis X 1 . As is known per se, the bowl 1 makes it possible to spray the coating product into fine droplets. All of these droplets form a jet of product J 1 , shown in phantom at the figure 1 , which leaves the bowl 1 and goes to an object to be coated, not shown, on which the jet of product J 1 forms an impact.

Pour conformer le jet de produit J42, le projecteur P comporte des canaux de sortie 41 qui sont répartis autour de l'axe X1 et qui débouchent à l'extrémité aval du corps 50 sur des orifices 42. En fonctionnement, il sort un jet d'air J1 de chaque orifice 42 prolongeant un canal de sortie 41. Les jets d'air J1 permettent de conformer le jet de produit J1 et de le guider vers l'objet à revêtir. Chaque canal de sortie 41 est ménagé dans le corps 50, c'est-à-dire dans la partie interne 20 ou dans la partie externe 70. En l'occurrence, chaque canal de sortie 41 est percé dans la portion aval de la partie distale 40. En pratique, chaque canal de sortie peut être réalisé différemment.In order to conform to the jet of product J 42 , the projector P has outlet channels 41 which are distributed around the axis X 1 and which open at the downstream end of the body 50 on orifices 42. In operation, it leaves a air jet J 1 of each orifice 42 extending an outlet channel 41. The jets of air J 1 make it possible to conform the jet of product J 1 and to guide it towards the object to be coated. Each outlet channel 41 is formed in the body 50, that is to say in the inner portion 20 or in the outer portion 70. In this case, each outlet channel 41 is drilled in the downstream portion of the portion In practice, each output channel can be made differently.

Pour amener l'air comprimé aux canaux des sorties 41, une chambre de sortie 324 est formée, à l'extrémité aval de la partie interne 20, entre la partie interne 20 et la partie externe 70. La chambre de sortie 324 présente une forme annulaire à symétrie de révolution qui s'étend autour de l'axe X1 et juste en amont des canaux de sortie 41. La chambre de sortie 324 communique avec les canaux de sortie 41.To bring the compressed air to the channels of the outlets 41, an outlet chamber 324 is formed, at the downstream end of the inner portion 20, between the inner portion 20 and the outer portion 70. The outlet chamber 324 has a shape rotationally symmetrical ring which extends around the axis X 1 and just upstream of the outlet channels 41. The outlet chamber 324 communicates with the outlet channels 41.

De plus, le projecteur P comporte deux conduites d'entrée 201 et 202 qui sont ménagées dans le corps 50 de façon à alimenter en air la chambre de sortie 324, donc les canaux de sortie 42.In addition, the projector P has two inlet ducts 201 and 202 which are formed in the body 50 so as to supply air to the outlet chamber 324, and thus to the outlet channels 42.

Dans la présente demande, les termes « entrée », « sortie », « amont » et « aval » sont employés par référence au sens général d'écoulement de l'air comprimé dans le projecteur P, depuis l'interface entre le projecteur P et l'embase 60, qui définit une entrée amont, jusqu'aux canaux de sortie 42 qui définissent des sorties aval.In the present application, the terms "input", "output", "upstream" and "downstream" are used by reference to the general direction of flow of compressed air in the projector P, from the interface between the projector P and the base 60, which defines an upstream input, to the output channels 42 which define downstream outputs.

Comme le montre la figure 2, la partie interne 20 se compose globalement d'une portion proximale 203 de forme sensiblement cylindrique à base circulaire d'axe X1, et d'une portion distale 204 de forme globalement tronconique et dont l'encombrement est inférieur à celui de la portion proximale 203. La partie interne 20 est tubulaire de façon à loger la turbine T.As shown in figure 2 , the inner portion 20 is generally composed of a proximal portion 203 of substantially cylindrical shape with a circular base of axis X 1 , and a distal portion 204 of generally frustoconical shape and whose size is smaller than that of the portion 203. The inner portion 20 is tubular so as to house the turbine T.

Dans la présente demande, par « chambre » on désigne une enceinte, c'est-à-dire un volume creux et entièrement délimité par des parois. Une telle chambre présente des ouvertures permettant l'entrée et la sortie de fluide respectivement dans et hors de la chambre.In the present application, "chamber" means an enclosure, that is to say a hollow volume and entirely delimited by walls. Such a chamber has openings for the entry and exit of fluid respectively in and out of the chamber.

Dans la présente demande, les termes « relier », « connecter », « communiquer » font référence à la communication de fluide, en particulier d'air comprimé, c'est-à-dire à un lien qui permet à un fluide, gazeux ou liquide, de s'écouler ou de circuler entre deux ou plusieurs points ou pièces. Un tel lien peut être direct ou indirect, c'est-à-dire réalisé par un conduit, un tuyau, une canalisation etc. De même, les noms dérivés de ces verbes, tels que « connexion » et « raccordement » concernent une telle communication de fluide.In the present application, the terms "connect", "connect", "communicate" refer to the communication of fluid, in particular compressed air, that is to say to a link that allows a fluid, gaseous or liquid, to flow or flow between two or more points or parts. Such a link can be direct or indirect, that is to say realized by a pipe, a pipe, a pipe and so on. Similarly, the nouns derived from these verbs, such as "connection" and "connection" relate to such fluid communication.

Dans la présente demande, les termes, « alimenter », « injecter », « éjecter » font référence à un écoulement de fluide, en particulier d'air comprimé.In the present application, the terms "feed", "inject", "eject" refer to a flow of fluid, in particular compressed air.

Comme le montrent les figures 1 et 3, les conduites d'entrée 201 et 202 s'étendent à travers l'épaisseur de la portion proximale 203 et suivant l'axe X1. Les conduites d'entrée 201 et 202 sont ici diamétralement opposées par rapport à l'axe X1. Alternativement, les conduites d'entrée peuvent occuper d'autres positions angulaires autour de l'axe de pulvérisation. En amont, les conduites d'entrée 201 sont connectées à une conduite d'alimentation en air comprimé non représentée.As shown by figures 1 and 3 the inlet ducts 201 and 202 extend through the thickness of the proximal portion 203 and along the axis X 1 . The inlet ducts 201 and 202 are here diametrically opposite with respect to the axis X 1 . Alternatively, the inlet ducts may occupy other angular positions around the spray axis. Upstream, the inlet pipes 201 are connected to a compressed air supply pipe not shown.

Comme le montrent les figures 1 et 2, trois chambres intermédiaires 210, 230 et 250 sont juxtaposées suivant l'axe X1 au niveau de la portion proximale 203 et entre les conduites d'entrée 201 et 202, d'une part, et la portion distale 204, d'autre part. Chaque chambre intermédiaire 210, 230 ou 250 a une forme globalement annulaire à base circulaire autour de l'axe X1. Ainsi, chaque chambre intermédiaire 210, 230 ou 250 s'étend autour de l'axe X1. Chaque chambre intermédiaire 210, 230 ou 250 est formée entre la partie interne 20 et la partie externe 70. La conduite d'entrée 201 débouche dans la chambre intermédiaire 210 qui est la plus éloignée axialement du bol 1.As shown by figures 1 and 2 three intermediate chambers 210, 230 and 250 are juxtaposed along the axis X 1 at the proximal portion 203 and between the inlet lines 201 and 202, on the one hand, and the distal portion 204, on the other hand . Each intermediate chamber 210, 230 or 250 has a generally annular shape with a circular base around the axis X 1 . Thus, each intermediate chamber 210, 230 or 250 extends around the axis X 1 . Each room intermediate 210, 230 or 250 is formed between the inner portion 20 and the outer portion 70. The inlet pipe 201 opens into the intermediate chamber 210 which is the furthest axially from the bowl 1.

Dans la présente demande, les termes « axial », « radial », « axialement » et « radialement » sont employés par référence à l'axe X1 qui est l'axe de rotation du bol du projecteur rotatif.In the present application, the terms "axial", "radial", "axially" and "radially" are used with reference to the axis X 1 which is the axis of rotation of the bowl of the rotating projector.

Les chambres intermédiaires 210, 230 et 250 sont parallèles entre elles. Les chambres intermédiaires 210 et 230 sont séparées par une première nervure 220 qui a une forme globalement annulaire à base circulaire autour de l'axe X1. Les chambres intermédiaires 230 et 250 sont séparées par une deuxième nervure 240 qui a une forme globalement annulaire à base circulaire autour de l'axe X1. Le diamètre externe de la première nervure 220 et de la deuxième nervure 240 correspond au diamètre externe de la partie proximale 203 et au diamètre interne de la partie externe 70. Ainsi, les surfaces radiales externes de la première nervure 220 et de la deuxième nervure 240 portent contre la surface cylindrique interne de la partie externe, ce qui rend leur interface sensiblement étanche à l'air comprimé.The intermediate chambers 210, 230 and 250 are parallel to each other. The intermediate chambers 210 and 230 are separated by a first rib 220 which has a generally annular shape with a circular base around the axis X 1 . The intermediate chambers 230 and 250 are separated by a second rib 240 which has a generally annular shape with a circular base around the axis X 1 . The outer diameter of the first rib 220 and the second rib 240 corresponds to the outer diameter of the proximal portion 203 and the inner diameter of the outer portion 70. Thus, the outer radial surfaces of the first rib 220 and the second rib 240 bear against the inner cylindrical surface of the outer portion, which makes their interface substantially airtight.

Dans la première nervure 220 sont ménagés quatre canaux intermédiaires 221, 222, 223 et 224, visibles aux figures 4 et 5 et, pour deux d'entre eux, aux figures 2 et 3. Ces quatre canaux intermédiaires 221 à 224 s'étendent parallèlement à l'axe X1 entre les chambres intermédiaires 210 et 230. Ces quatre canaux intermédiaires 221 à 224 débouchent donc, d'une part, dans la chambre intermédiaire 210 et, d'autre part, dans la chambre intermédiaire 230. En pratique, les canaux intermédiaires s'étendent suivant une direction à composante axiale, cette direction pouvant être non parallèle à l'axe de pulvérisation.In the first rib 220 are formed four intermediate channels 221, 222, 223 and 224, visible to the Figures 4 and 5 and, for two of them, to figures 2 and 3 . These four intermediate channels 221 to 224 extend parallel to the axis X 1 between the intermediate chambers 210 and 230. These four intermediate channels 221 to 224 thus open on the one hand into the intermediate chamber 210 and, on the other hand, In practice, the intermediate channels extend in an axial component direction, this direction possibly being non-parallel to the spray axis.

De même, dans la deuxième nervure 240 sont ménagés huit canaux intermédiaires 241, 242, 243, 244, 245, 246, 247 et 248, visibles aux figures 4 et 5 et, pour quatre d'entre eux, aux figures 2 et 3. Les canaux intermédiaires 241 à 248 s'étendent parallèlement à l'axe X1 entre les chambres intermédiaires 230 et 250. Chaque canal intermédiaire 241, 242, 243, 244, 245, 246, 247 ou 248 débouche donc dans la chambre intermédiaire 230 et dans la chambre intermédiaire 250.Similarly, in the second rib 240 are formed eight intermediate channels 241, 242, 243, 244, 245, 246, 247 and 248, visible to Figures 4 and 5 and, for four of them, figures 2 and 3 . The intermediate channels 241 to 248 extend parallel to the axis X 1 between the intermediate chambers 230 and 250. Each intermediate channel 241, 242, 243, 244, 245, 246, 247 or 248 therefore opens into the intermediate chamber 230 and in the intermediate chamber 250.

Les canaux intermédiaires 221 à 224 forment un premier ensemble de canaux intermédiaires. Les chambres intermédiaires 210 et 230 sont donc reliées par le premier ensemble de canaux intermédiaires, à savoir les canaux intermédiaires 221 à 224. Les canaux intermédiaires 241 à 248 forment un deuxième ensemble de canaux intermédiaires. Les chambres intermédiaires 230 et 250 sont donc reliées par le deuxième ensemble de canaux intermédiaires, à savoir les canaux intermédiaires 241 à 248. Ainsi, deux chambres intermédiaires juxtaposées, suivant l'axe X1, sont reliées par un ensemble de canaux intermédiaires.Intermediate channels 221 to 224 form a first set of intermediate channels. The intermediate chambers 210 and 230 are thus connected by the first set of intermediate channels, namely the intermediate channels 221 to 224. The intermediate channels 241 to 248 form a second set of intermediate channels. The intermediate chambers 230 and 250 are thus connected by the second set of intermediate channels, namely the intermediate channels 241 to 248. Thus, two intermediate chambers juxtaposed along the axis X 1 , are connected by a set of intermediate channels.

Le rapport entre le nombre de canaux intermédiaires 241 à 248, qui appartiennent au deuxième ensemble reliant les chambres intermédiaires 230 et 250, les plus proches axialement du bol, et le nombre de canaux intermédiaires 221 à 224, qui appartiennent au premier ensemble reliant les chambres intermédiaires 210 et 230, les plus éloignées axialement du bol, vaut ici 2, car il y a quatre canaux intermédiaires 221 à 224 et huit canaux intermédiaires 241 à 248.The ratio between the number of intermediate channels 241 to 248, which belong to the second set connecting the intermediate chambers 230 and 250, the axially closest to the bowl, and the number of intermediate channels 221 to 224, which belong to the first set connecting the chambers Intermediates 210 and 230, the furthest axially from the bowl, is here 2 because there are four intermediate channels 221 to 224 and eight intermediate channels 241 to 248.

En pratique, ce rapport entre les nombres de canaux intermédiaires appartenant aux ensembles reliant respectivement les deux chambres intermédiaires les plus proches axialement du bol et les deux chambres intermédiaires les plus éloignées axialement du bol est compris entre 1,5 et 10, de préférence 2.In practice, this ratio between the numbers of intermediate channels belonging to the assemblies respectively connecting the two intermediate chambers axially closest to the bowl and the two intermediate chambers furthest from the bowl axially is between 1.5 and 10, preferably 2.

Chaque canal intermédiaire 221 à 224 et 241 à 248 est constitué par une encoche qui s'étend parallèlement à l'axe X1. Chacune de ces encoches est formée par évidement respectif qui est réalisé en creux sur la surface externe de la partie interne 20. Les canaux intermédiaires 221 à 224 et 241 à 248 permettent l'écoulement d'air entre les chambres intermédiaires 210, 230 et 250.Each intermediate channel 221 to 224 and 241 to 248 is constituted by a notch which extends parallel to the axis X 1 . Each of these notches is formed by respective recess which is made recessed on the outer surface of the inner portion 20. The intermediate channels 221 to 224 and 241 to 248 allow the flow of air between the intermediate chambers 210, 230 and 250 .

Chaque chambre intermédiaire 210, 230 ou 250 est constituée par une gorge dont la section transversale à l'axe X1 est tubulaire à base circulaire. Chacune de ces gorges est formée par un évidement respectif qui est réalisé en creux sur la surface externe de la partie interne 20. Les chambres intermédiaires 210, 230 et 250 conduisent l'écoulement d'air entre la conduite d'entrée 201 et des conduites de sortie 261, 262, 263, 268 et équivalents décrites ci-après.Each intermediate chamber 210, 230 or 250 is constituted by a groove whose cross section to the axis X 1 is tubular with a circular base. Each of these grooves is formed by a respective recess which is hollowed out on the outer surface of the inner portion 20. The intermediate chambers 210, 230 and 250 conduct the flow of air between the inlet pipe 201 and pipes output 261, 262, 263, 268 and equivalents described hereinafter.

La partie externe 70 a une forme globalement complémentaire à la forme de la partie interne 20. Ces formes complémentaires de la partie externe et de la partie interne 20 sont déterminées de sorte que la partie externe recouvre totalement chacun des évidements de la partie interne 20, c'est-à-dire chaque chambre intermédiaire 210, 230 ou 250 et chaque canal intermédiaire 241 à 248. En d'autres termes, les chambres intermédiaires 210, 230 et 250 et les canaux intermédiaires 221 à 224 et 241 à 248 sont ainsi formés entre la partie interne 20 et la partie externe 70.The outer portion 70 has a shape generally complementary to the shape of the inner portion 20. These complementary shapes of the outer portion and the inner portion 20 are determined so that the outer portion completely covers each of the recesses of the inner portion 20, that is to say each intermediate chamber 210, 230 or 250 and each intermediate channel 241 to 248. In other words, the intermediate chambers 210, 230 and 250 and the intermediate channels 221 to 224 and 241 to 248 are thus formed between the inner portion 20 and the outer portion 70.

Par ailleurs, dans le premier mode de réalisation illustré aux figures 1 à 5, le projecteur rotatif P comporte huit conduites de sortie, dont quatre sont visibles aux figures 2 et 3 avec les références 261, 262, 263 et 268. Comme le montre la figure 2, chaque conduite de sortie 261, 262, 263, 268 ou équivalent s'étend dans la partie interne 20, entre la chambre de sortie 324 et la chambre intermédiaire 250 qui est la plus proche axialement du bol 1. Comme les canaux intermédiaires 221 à 224 et 241 à 248, les conduites de sortie 261, 262, 263, 268 et équivalents sont reparties uniformément autour de l'axe X1.Moreover, in the first embodiment illustrated in Figures 1 to 5 , the rotating projector P has eight outlet pipes, four of which are visible at figures 2 and 3 with references 261, 262, 263 and 268. As shown in figure 2 each outlet line 261, 262, 263, 268 or equivalent extends into the inner portion 20, between the outlet chamber 324 and the intermediate chamber 250 which is the closest axially of the bowl 1. As the intermediate channels 221 to 224 and 241 to 248, the outlet ducts 261, 262, 263, 268 and equivalents are distributed uniformly around the axis X 1 .

Comme cela apparaît plus particulièrement pour la conduite de sortie 268 à la figure 3, chaque conduite de sortie 261, 262, 263, 268 ou équivalent est composée d'un tronçon radial 268.1 et d'un tronçon axial 268.2 qui sont percés dans la partie distale 204. Les tronçons radiaux et axiaux des conduites de sortie 261, 262, 263, 268 et équivalents sont cylindriques et ont des diamètres respectivement identiques entre eux.As appears more particularly for the outlet pipe 268 at the figure 3 , each outlet pipe 261, 262, 263, 268 or equivalent is composed of a radial section 268.1 and an axial section 268.2 which are drilled in the distal portion 204. The radial and axial sections of the outlet pipes 261, 262 , 263, 268 and the like are cylindrical and have diameters respectively identical to each other.

Pour uniformiser les débits d'air s'écoulant des canaux de sortie de type 41, le corps 50 est structuré de façon à égaliser les pressions d'air régnant autour de l'axe X1 dans la chambre de sortie 324. Dans ce but, les canaux intermédiaires d'un même ensemble sont répartis autour de l'axe X1. Par « répartis » on désigne des canaux intermédiaires distribués sur toute la circonférence de la première nervure 220 ou de la deuxième nervure 240. En d'autres termes, les canaux intermédiaires d'un même ensemble ne sont pas concentrés dans un secteur angulaire étroit, mais au contraire « étalés » autour de l'axe X1.To standardize the flow rates of air flowing from the type 41 outlet channels, the body 50 is structured so as to equalize the air pressures prevailing around the axis X 1 in the outlet chamber 324. For this purpose , the intermediate channels of the same set are distributed around the axis X 1 . "Distributed" means intermediate channels distributed over the entire circumference of the first rib 220 or the second rib 240. In other words, the intermediate channels of the same set are not concentrated in a narrow angular sector, but instead "spread" around the axis X 1 .

Plus particulièrement, dans le mode de réalisation illustré aux figures 2 à 5, les canaux intermédiaires, 221 à 224 ou 241 à 248, d'un même ensemble sont répartis uniformément autour de l'axe X1, si bien que deux canaux intermédiaires successifs suivant une direction circonférentielle sont séparés d'un angle constant. Deux canaux intermédiaires 221 à 224 voisins forment un angle A d'environ 90°. En pratique, l'angle A est compris entre 60° et 120 °. Deux canaux intermédiaires 241 à 248 voisins forment un angle B d'environ 45°. En pratique, l'angle B est compris entre 30°et 60°.More particularly, in the embodiment illustrated in Figures 2 to 5 , the intermediate channels 221 to 224 or 241 to 248 of the same set are uniformly distributed around the axis X 1 , so that two intermediate channels successive ones in a circumferential direction are separated by a constant angle. Two intermediate channels 221 to 224 neighbors form an angle A of about 90 °. In practice, the angle A is between 60 ° and 120 °. Two intermediate channels 241 to 248 neighbors form an angle B of about 45 °. In practice, the angle B is between 30 ° and 60 °.

Le nombre de conduites de sorties 261, 262, 263, 268 et équivalents, à savoir huit, est ici égal au nombre de canaux intermédiaires 241 à 248 appartenant au deuxième ensemble qui relient les chambres intermédiaires 230 et 250, lesquelles sont les plus proches axialement du bol 1. Le rapport entre le nombre de conduites de sortie 261, 262, 263, 268 et équivalents et le nombre de canaux intermédiaires 241 à 248 vaut donc 1.The number of output lines 261, 262, 263, 268 and equivalents, namely eight, is here equal to the number of intermediate channels 241 to 248 belonging to the second set which connect the intermediate chambers 230 and 250, which are the closest axially of the bowl 1. The ratio between the number of outlet pipes 261, 262, 263, 268 and equivalents and the number of intermediate channels 241 to 248 is therefore 1.

En pratique, le nombre de conduites de sortie est supérieur ou égal à quatre et le rapport entre le nombre de conduites de sortie et le nombre de canaux intermédiaires appartenant à l'ensemble reliant les deux chambres intermédiaires les plus proches axialement de l'organe de pulvérisation, c'est-à-dire l'ensemble « aval », est supérieur à ou égal à 0,25. Ce rapport vaut 0,25 lorsqu'on a, par exemple, quatre conduites de sortie et trente-deux canaux intermédiaires appartenant à l'ensemble « aval ». Un tel rapport permet d'égaliser les pressions d'air dans la chambre intermédiaire 250, c'est-à-dire en amont des conduites de sortie 261, 262, 263, 268 et équivalent.In practice, the number of outlet ducts is greater than or equal to four and the ratio between the number of outlet ducts and the number of intermediate ducts belonging to the assembly connecting the two intermediate chambers closest axially to the control unit. spray, that is to say the "downstream" set, is greater than or equal to 0.25. This ratio is 0.25 when, for example, there are four outlet pipes and thirty-two intermediate channels belonging to the "downstream" assembly. Such a ratio makes it possible to equalize the air pressures in the intermediate chamber 250, that is to say upstream of the outlet pipes 261, 262, 263, 268 and equivalent.

Pour assurer une répartition relativement uniforme des débits d'air s'écoulant dans les canaux intermédiaires 221 à 224 et 241 à 248, les canaux intermédiaires d'un même ensemble, premier ou deuxième, ont des sections débitantes sensiblement identiques.To ensure a relatively uniform distribution of the flow rates of air flowing in the intermediate channels 221 to 224 and 241 to 248, the intermediate channels of the same set, first or second, have substantially identical flow sections.

Dans l'exemple des figures 4 et 5, la section débitante de chaque canal intermédiaire 221 à 224 est approximativement rectangulaire, de largeur l221 et de hauteur h221. La largeur l221 vaut environ 4 mm. La hauteur h221 vaut environ 2 mm.In the example of Figures 4 and 5 , the flow section of each intermediate channel 221 to 224 is approximately rectangular, of width l 221 and height h 221 . The width l 221 is about 4 mm. The height h 221 is approximately 2 mm.

De même, les canaux intermédiaires 241 à 248 du deuxième ensemble ont des sections débitantes identiques entre elles, de forme approximativement rectangulaire, de largeur l242 et de hauteur h242. En pratique, les canaux intermédiaires d'un même ensemble peuvent avoir des formes quelconques.Similarly, the intermediate channels 241 to 248 of the second set have flow sections identical to each other, of approximately rectangular shape, of width L 242 and height H 242 . In practice, the intermediate channels of the same set may have any shape.

La figure 3 illustre les écoulements d'air par des flèches incurvées. Comme le montrent ces flèches, un projecteur rotatif conforme à l'invention permet de répartir uniformément pressions et débits d'air depuis les conduites d'entrée 201 et 202 jusqu'à la chambre de sortie 324.The figure 3 illustrates the air flows by curved arrows. As shown by these arrows, a rotating projector according to the invention makes it possible to evenly distributing pressures and airflows from the inlet lines 201 and 202 to the outlet chamber 324.

Comme le montre la figure 4, les canaux intermédiaires 221 à 224, du premier ensemble occupent des positions angulaires symétriques autour de l'axe X1, puisqu'ils sont séparés deux à deux successivement par l'angle A constant. Comme le montre la figure 5, les canaux intermédiaires 241 à 248 du deuxième ensemble occupent des positions angulaires symétriques autour de l'axe X1, car ils sont séparés deux à deux successivement par l'angle B constant.As shown in figure 4 , the intermediate channels 221 to 224 of the first set occupy symmetrical angular positions around the axis X 1 , since they are separated successively by the constant angle A in pairs. As shown in figure 5 , the intermediate channels 241 to 248 of the second set occupy symmetrical angular positions around the axis X 1 , because they are separated successively by the constant angle B in pairs.

De plus, les canaux intermédiaires 221 à 224 occupent chacun une position angulaire qui est décalée par rapport à la conduite d'entrée 201. En d'autres termes, la conduite d'entrée 201 et l'un des canaux intermédiaires 221 à 224 forme un angle C sur l'axe X1 non nul et qui vaut environ 45°.In addition, the intermediate channels 221 to 224 each occupy an angular position which is offset from the inlet line 201. In other words, the inlet line 201 and one of the intermediate channels 221 to 224 form an angle C on the axis X 1 non-zero and which is about 45 °.

La position angulaire d'un canal intermédiaire est définie dans un plan orthogonal à l'axe X1 et en référence à un axe sensiblement médian de ce canal intermédiaire, un tel axe étant représenté en traits mixtes sur les figures 4 et 5 The angular position of an intermediate channel is defined in a plane orthogonal to the axis X 1 and with reference to a substantially median axis of this intermediate channel, such an axis being represented in phantom on the Figures 4 and 5

Comme le montre la figure 5, les canaux intermédiaires 241 à 248 occupent chacun une position angulaire décalée par rapport aux canaux intermédiaires 221 à 224. En d'autres termes, un canal intermédiaire 241 à 248 et un canal intermédiaire 221 à 224 voisins forment un angle D sur l'axe X1 non nul et qui vaut environ 22,5°.As shown in figure 5 , the intermediate channels 241 to 248 each occupy an angular position offset from the intermediate channels 221 to 224. In other words, an intermediate channel 241 to 248 and an intermediate channel 221 to 224 neighbors form an angle D on the axis X 1 not zero and which is about 22.5 °.

Ainsi, les chambres intermédiaires 210, 230 et 250 et les canaux intermédiaires 221 à 224 et 241 à 248 définissent une sorte de labyrinthe qui contraint l'air injecté par la conduite d'entrée 201 à se répartir uniformément autour de l'axe X1.Thus, the intermediate chambers 210, 230 and 250 and the intermediate channels 221 to 224 and 241 to 248 define a kind of labyrinth which forces the air injected by the inlet pipe 201 to be distributed uniformly about the axis X 1 .

Par ailleurs, la section débitante totale des canaux de sortie 42 est supérieure ou égale à la section débitante totale des conduites d'entrée 201 et 202. De plus, la section débitante totale des canaux de sortie est supérieure ou égale à une section débitante totale des canaux intermédiaires 221 à 224 ou 241 à 248 appartenant à un même ensemble, premier ou deuxième. De plus, la section débitante totale des canaux intermédiaires 221 à 224 ou 241 à 248 appartenant à un même ensemble, premier ou deuxième, est supérieure ou égale, à la section débitante totale de la conduite d'entrée 201.Furthermore, the total flow section of the outlet channels 42 is greater than or equal to the total flow section of the inlet pipes 201 and 202. In addition, the total flow section of the outlet channels is greater than or equal to a total flow section. intermediate channels 221 to 224 or 241 to 248 belonging to the same set, first or second. In addition, the total flow section of the intermediate channels 221 to 224 or 241 to 248 belonging to the same set, first or second, is greater than or equal to the total flow section of the inlet pipe 201.

Par « section débitante » on désigne la section à travers laquelle peut s'écouler de l'air comprimé. Par « section débitante totale » on désigne la somme des sections débitantes unitaires de plusieurs éléments identiques entre eux, tels que les canaux intermédiaires d'un même ensemble ou les conduites de sortie.By "flow section" is meant the section through which compressed air can flow. By "total flow section" is meant the sum of the unit flow sections of several elements identical to each other, such as the intermediate channels of the same set or the outlet pipes.

Plus généralement, la section débitante totale augmente, d'amont en aval, à chaque composant « débitant » du labyrinthe, ce qui limite les pertes de charge et évite une augmentation locale de la pression d'air qui tendrait à déséquilibrer l'air de jupe.More generally, the total flow section increases, from upstream to downstream, to each "flow" component of the labyrinth, which limits the pressure drops and avoids a local increase in air pressure which tends to unbalance the air in the air. skirt.

Dans ce but, la section débitante totale, soit 4.l221.h221, des canaux intermédiaires 221 à 224 du premier ensemble, lequel relie les chambres intermédiaires 210 et 230 les plus éloignées axialement du bol 1, est inférieure à la section débitante totale, soit 8.l241.h241, des canaux intermédiaires 241 à 248 du deuxième ensemble, lequel relie les chambres intermédiaires 230 et 250 les plus proches axialement du bol 1.For this purpose, the total flow section or .h 4.l 221 221, of the intermediate channels 221 to 224 of the first set, which connects the intermediate chambers 210 and 230 farthest axially from the bowl 1 is smaller than the flow section 8. I 241 .h 241 , intermediate channels 241 to 248 of the second set, which connects the intermediate chambers 230 and 250 the axially closest to the bowl 1.

Par ailleurs, le projecteur rotatif comporte en outre un organe de déflexion d'air qui est situé dans la chambre de sortie 324 et qui permet aussi d'améliorer l'uniformité des pressions d'air autour de l'axe X1.Furthermore, the rotating projector further comprises an air deflection member which is located in the outlet chamber 324 and which also improves the uniformity of the air pressures around the axis X 1 .

Le corps représenté aux figures 2 à 5 comporte trois chambres intermédiaires 210, 230 et 250. En pratique, le nombre de chambres intermédiaires est compris entre trois et huit.The body represented Figures 2 to 5 has three intermediate chambers 210, 230 and 250. In practice, the number of intermediate chambers is between three and eight.

Les figure 6 et 7 montrent une partie d'une variante au projecteur des figures 1 à 5, cette variante ne faisant pas partie de l'invention, dans lequel, le corps comporte une seule conduite d'entrée 601 et deux chambres juxtaposées. Le premier ensemble de canaux intermédiaires comprend alors deux canaux intermédiaires 621 et 622 qui sont diamétralement opposés et qui sont décalés, dans un plan transversal à l'axe de pulvérisation X6, d'un angle C6, analogue à l'angle C, d'environ 90° par rapport à la conduite d'entrée 601. Le deuxième ensemble de canaux intermédiaires comprend quatre canaux intermédiaires 641, 642, 643 et 644 deux à deux séparés d'un angle B6, analogue à l'angle B, d'environ 90° et répartis angulairement entre les canaux intermédiaires 621 et 622 du premier ensemble, l'angle de décalage D6 analogue à l'angle D valant environ 45°. Ainsi, on distribue uniformément les pressions et débits d'air entre chacun des canaux intermédiaires, ce qui réalise un air de jupe équilibré ou symétrique.The figure 6 and 7 show a part of a variant to the projector of Figures 1 to 5 , this variant not forming part of the invention, wherein the body comprises a single inlet pipe 601 and two juxtaposed chambers. The first set of intermediate channels then comprises two intermediate channels 621 and 622 which are diametrically opposed and which are offset, in a plane transverse to the spraying axis X 6 , by an angle C 6 , similar to the angle C, approximately 90 ° with respect to the inlet line 601. The second set of intermediate channels comprises four intermediate channels 641, 642, 643 and 644 separated in pairs from an angle B 6 , similar to the angle B, about 90 ° and angularly distributed between the intermediate channels 621 and 622 of the first set, the angle of offset D 6 analogous to the angle D is about 45 °. Thus, it distributes uniformly the pressures and air flows between each of the intermediate channels, which achieves a balanced or symmetrical skirt air.

Dans l'exemple décrit ci-dessus, la répartition des débits d'air de jupe autour de l'axe de pulvérisation est maîtrisée de façon uniforme et symétrique. Selon une variante non représentée, un projecteur conforme à l'invention comprend au moins une bague mobile en rotation autour de l'axe de pulvérisation. L'un des ensembles de canaux intermédiaires, donc une nervure de type 220 ou 240, est réalisé dans cette bague mobile.In the example described above, the distribution of skirt air flow around the spray axis is controlled uniformly and symmetrically. According to a variant not shown, a projector according to the invention comprises at least one ring movable in rotation about the spray axis. One of the sets of intermediate channels, so a rib type 220 or 240, is made in this movable ring.

Une telle bague mobile permet d'ajuster la position angulaire relative des canaux intermédiaires de cet ensemble par rapport aux canaux d'un ensemble juxtaposé, typiquement l'angle D ou D6. Ainsi, on maîtrise la répartition des débits d'air de jupe autour de l'axe de pulvérisation. Par exemple, si l'on place des canaux intermédiaires en regard d'autres canaux intermédiaires, on obtient une répartition inégale et maîtrisée des débits d'air autour de l'axe de pulvérisation. On peut ainsi générer un air de jupe de forme globalement elliptique et non plus circulaire comme dans la variante illustrée aux figures 1 à 7. On peut aussi prévoir plusieurs bagues mobiles en rotation indépendamment les unes des autres, pour ajuster les débits d'air de jupe.Such a movable ring makes it possible to adjust the relative angular position of the intermediate channels of this assembly with respect to the channels of a juxtaposed assembly, typically the angle D or D 6 . Thus, it controls the distribution of skirt air flow around the spray axis. For example, if intermediate channels are placed opposite other intermediate channels, an unequal and controlled distribution of the air flows around the spray axis is obtained. It is thus possible to generate a skirt air of globally elliptical shape and no longer circular, as in the variant illustrated in FIGS. Figures 1 to 7 . It is also possible to provide several rotating rings independently of each other, to adjust the skirt air flow rates.

Selon une autre variante non représentée, le corps peut comporter plusieurs chambres intermédiaires en forme de portions annulaires disjointes autour de l'axe de rotation.According to another variant not shown, the body may comprise a plurality of intermediate chambers in the form of annular portions disjoint around the axis of rotation.

Selon une autre variante non représentée, les gorges et encoches qui forment respectivement les chambres intermédiaires et les canaux intermédiaires sont réalisées dans la partie externe du corps, telle que la partie externe 70. Les chambres intermédiaires et les canaux intermédiaires sont alors recouverts par la partie interne de forme globalement complémentaire à la partie externe.According to another variant not shown, the grooves and notches which respectively form the intermediate chambers and the intermediate channels are formed in the outer part of the body, such as the outer part 70. The intermediate chambers and the intermediate channels are then covered by the part internal form globally complementary to the external part.

Selon une autre variante non représentée, le projecteur comprend deux ou plus conduites d'entrée qui injectent respectivement de l'air comprimé dans des chambres intermédiaires distinctes, par exemple la plus éloignée axialement du bol et celle qui lui est juxtaposée. De telles conduites d'entrée sont en tout cas destinées à alimenter en air les canaux de sortie, comme les conduites d'entrée 201 et 202.According to another variant not shown, the projector comprises two or more inlet pipes which respectively inject compressed air into separate intermediate chambers, for example the furthest axially from the bowl and that which is juxtaposed with it. Such inlet ducts are in any case intended to supply air to the outlet channels, such as the inlet ducts 201 and 202.

Selon une autre variante non représentée, les canaux intermédiaires d'un même ensemble, premier ou deuxième, peuvent avoir des sections débitantes respectives différentes. Dans ce cas, les sections débitantes respectives de chaque canal intermédiaire sont déterminées en fonction de la distance entre canal intermédiaire respectif et l'arrivée d'air, conduite d'entrée ou canal intermédiaire amont, la plus proche. Par exemple, un canal intermédiaire peut avoir une section débitante supérieure à celle de son voisin dans l'ensemble, notamment s'il est placé plus loin de l'arrivée d'air. Un tel dimensionnement assure une répartition relativement uniforme des débits d'air qui s'écoulent dans les canaux intermédiaires d'un même ensemble.According to another variant not shown, the intermediate channels of the same set, first or second, may have different respective flow sections. In this case, the respective debiting sections of each intermediate channel is determined as a function of the distance between the respective intermediate channel and the air inlet, input line or upstream intermediate channel, the nearest. For example, an intermediate channel may have a debiting section greater than that of its neighbor overall, especially if it is placed further from the air inlet. Such dimensioning ensures a relatively uniform distribution of air flows flowing in the intermediate channels of the same set.

Selon encore une autre variante non représentée, les chambres intermédiaires et les canaux intermédiaires sont formés dans une ou plusieurs pièce(s) poreuse(s), composée d'un ou plusieurs matériau(x) poreux, tel qu'une mousse de polymère, une pièce frittée en matériau plastique ou métallique ou tout autre matériau de porosité suffisante, dont les cavités et les connexions entre celles-ci forment les chambres intermédiaires et les canaux intermédiaires successifs . Cette pièce poreuse est rapportée sur une partie non poreuse, telle que la partie interne 20 mentionnée ci-dessus. Les chambres intermédiaires et les canaux intermédiaires peuvent alors avoir des géométries irrégulières, car ils sont respectivement constitués par des cavités ou des porosités de la pièce poreuse. Pour assurer la répartition des pressions et débits d'air dans les chambres intermédiaires et les canaux intermédiaires, la porosité de la pièce est prévue moins importante près de la ou des conduite(s) d'entrée et plus importante loin de la ou des conduite(s) d'entrée.According to yet another variant not shown, the intermediate chambers and the intermediate channels are formed in one or more porous part (s), composed of one or more porous material (s), such as a polymer foam, a sintered piece of plastic or metal material or any other material of sufficient porosity, the cavities and the connections between them form the intermediate chambers and the successive intermediate channels. This porous piece is attached to a non-porous part, such as the inner part 20 mentioned above. The intermediate chambers and the intermediate channels may then have irregular geometries, since they respectively consist of cavities or porosities of the porous part. To ensure the distribution of the air pressures and flows in the intermediate chambers and the intermediate channels, the porosity of the part is expected to be less important near the pipe (s) of entry and more important far from the pipe (s). (s) entry.

L'invention trouve aussi application dans le cas d'un projecteur comprenant plusieurs groupes de canaux de sortie, éjectant chacun un air de jupe globalement annulaire. Un tel projecteur comprend alors deux groupes disjoints comprenant chacun une(des) conduite(s) d'entrée, au moins deux chambres intermédiaires, des ensembles de canaux intermédiaires, des conduites de sortie et des canaux de sortie.The invention is also applicable in the case of a projector comprising several groups of output channels, each ejecting a generally annular skirt air. Such a projector then comprises two disjoint groups each comprising one or more inlet ducts, at least two intermediate chambers, sets of intermediate ducts, outlet ducts and outlet ducts.

L'invention a été représentée avec un pulvérisateur rotatif pourvu d'un bol 1 tournant autour de l'axe X1. Elle est toutefois applicable à un pulvérisateur ou à un projecteur à buse fixe, cette buse étant centrée sur un axe de pulvérisation. Bien que décrite en référence à un projecteur de produit liquide, l'invention est applicable aux projecteurs de produit pulvérulent.The invention has been shown with a rotary sprayer provided with a bowl 1 rotating about the axis X 1 . However, it is applicable to a sprayer or a fixed nozzle projector, this nozzle being centered on a spraying axis. Although described with reference to a liquid product projector, the invention is applicable to powder product projectors.

Claims (12)

  1. A coating material atomizer (P) comprising:
    • a body (50) comprising an inner portion (20) and an outer portion (70);
    • an atomizer member (1) for atomizing the coating material, which member is arranged at a downstream end of the body (50) so as to form a spray of coating material (J1), the atomizer member (1) being centered on a spraying axis (X1) ;
    • outlet channels (42) distributed about the spraying axis (X1), each outlet channel (42) being provided in the body (50) in such a manner as to eject air (J42) so as to shape the spray of coating material;
    • at least one outlet chamber (324) formed between the inner portion (20) and the outer portion (70), the outlet chamber (324) extending about the spraying axis (X1), the outlet chamber (324) communicating with the outlet channels (42);
    • at least one inlet duct (201) provided in the body, the inlet duct (201) being designed to feed air to the outlet channels (42);
    • at least two intermediate chambers (210, 230, 250) juxtaposed along the spraying axis (X1; X6), each intermediate chamber (210, 230, 250) being formed between the inner portion (20) and the outer portion (70), each intermediate chamber (210, 230, 250) extending about the spraying axis (X1; X6), at least one inlet duct (201) communicating with the intermediate chamber (210, 230, 250) that is axially furthest from the atomizer member (1) ;
    intermediate channels (221-224, 241-248; 621-622, 641-644) formed between the inner portion (20) and the outer portion (70), two juxtaposed intermediate chambers (210, 230, 250) being interconnected via a set of intermediate channels (221-224, 241-248; 621-622, 641-644), the intermediate channels (221-224, 241-248; 621-622, 641-644) of the same set being distributed about the spraying axis (X1; X6); and
    outlet ducts (261-268) extending between the intermediate chamber (210, 230, 250) that is axially closest to the atomizer member and the outlet chamber (324), the outlet ducts (261-268) being distributed about the spraying axis (X1; X6).
    said atomizer (P) being characterized in that
    • it includes between three and eight intermediate chambers (210, 230, 250) juxtaposed along the spraying axis (X1; X6) and
    • the intermediate channels (221-224, 241-248); 621-622, 641-644) belonging to the same set occupy angular positions about the spraying axis (X1; X6) that are offset angularly (D; D6) about the spraying axis (X1; X6) relative to the intermediate channels (221-224, 241-248; 621-622, 641-644) belonging to a juxtaposed set.
  2. An atomizer (P) according to claim 1, characterized in that the ratio between the number of outlet ducts (261-268) and the number of intermediate channels (241-248; 641-644) belonging to the set interconnecting the two intermediate chambers (230, 250) that are axially (X1; X6) closest to the atomizer member (1) is greater than or equal to 0.25.
  3. An atomizer (P) according to any preceding claim, characterized in that the number of outlet ducts (261-268) is greater than or equal to 4, and preferably greater than or equal to 8.
  4. An atomizer (P) according to any preceding claim, characterized in that the intermediate channels (221-224, 241-248; 621-622, 641-644) belonging to the same set are distributed about the spraying axis (X1; X6) and in that the outlet ducts (261-268) are distributed about the axis (X1; X6).
  5. An atomizer (P) according to claim 3, characterized in that the number of outlet ducts (261-268) is greater than 4, and preferably equal to 8, in that the ratio between the number of intermediate channels (241-248; 641-644) belonging to the set interconnecting the two intermediate chambers (230, 250) that are axially (X1; X6) closest to the atomizer member (1), and the number of intermediate channels (221-224; 621-622) belonging to the set interconnecting the two intermediate chambers (210, 230) that are axially (X1; X6) furthest from the atomizer member (1) lies in the range 1.5 to 10, and is preferably equal to 2.
  6. An atomizer (P) according to claim 3 or claim 4, characterized in that a total flow section of the intermediate channels (221-224; 621-622) belonging to a set interconnecting two intermediate chambers (210, 230) axially (X1; X6) further from the atomizer member (1) is less than or equal to a total flow section of the intermediate channels (241-248; 641-644) belonging to a set interconnecting two intermediate chambers (230, 250) axially (X1; X6) closer to the atomizer member (1).
  7. An atomizer (P) according to any preceding claim, characterized in that the intermediate channels (221-224, 241-248; 621-622, 641-644) of the same set have respective flow sections (ℓ221 × h221, ℓ242 × h242) that are substantially mutually identical, and in that the outlet ducts (261-268) have respective flow sections that are substantially mutually identical.
  8. An atomizer (P) according to any preceding claim, characterized in that the total flow section of the outlet ducts (261-268) is greater than or equal to the total flow section of the inlet duct(s) (201), in that the total flow section of the outlet ducts (261-268) is greater than or equal to a total flow section of the intermediate channels (221-224, 241-248; 621-622, 641-644) belonging to the same set, and in that the total flow section of the intermediate channels (221-224, 241-248; 621-622, 641-644) belonging to the same set is greater than or equal to the total flow section of the inlet duct(s) (201).
  9. An atomizer (P) according to any preceding claim, characterized in that the intermediate chambers (210, 230, 250) and the outlet chamber (324) are each of annular shape that is circularly symmetrical about the spraying axis (X1; X6).
  10. An atomizer (P) according to claim 9, characterized in that each intermediate chamber (210, 230, 250) is constituted by an annular groove, and in that each intermediate channel (221-224, 241-248; 621-622, 641-644) is constituted by a notch extending parallel to the spraying axis (X1; X6), in that each groove and each notch is formed by a respective recess in the inner portion (20) and/or in the outer portion (70), and in that the outer portion (70) and the inner portion (20) have overall shapes that are mutually complementary, so as to cover each recess entirely.
  11. An atomizer according to claim 1, characterized in that it further comprises at least one ring that is mounted to move in rotation about the spraying axis, and in that the set of intermediate channels is formed in said moving ring.
  12. An atomizer (P) according to any preceding claim, characterized in that each intermediate chamber (210, 230, 250) and each intermediate channel (221-224, 241-248; 621-622, 641-644) are formed by cavities in a porous part.
EP09801733.8A 2008-12-02 2009-12-01 Coating material ejector Active EP2361157B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09801733T PL2361157T3 (en) 2008-12-02 2009-12-01 Coating material ejector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0806770A FR2939056B1 (en) 2008-12-02 2008-12-02 COATING PRODUCT PROJECTOR
PCT/FR2009/052359 WO2010063943A1 (en) 2008-12-02 2009-12-01 Coating material ejector

Publications (2)

Publication Number Publication Date
EP2361157A1 EP2361157A1 (en) 2011-08-31
EP2361157B1 true EP2361157B1 (en) 2016-03-02

Family

ID=40847781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09801733.8A Active EP2361157B1 (en) 2008-12-02 2009-12-01 Coating material ejector

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US (1) US8590807B2 (en)
EP (1) EP2361157B1 (en)
JP (1) JP5698143B2 (en)
KR (1) KR101698432B1 (en)
CN (1) CN102281955B (en)
ES (1) ES2565841T3 (en)
FR (1) FR2939056B1 (en)
PL (1) PL2361157T3 (en)
WO (1) WO2010063943A1 (en)

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JP5748830B2 (en) * 2013-12-13 2015-07-15 施 顯照Ｈｓｉｅｎ−Ｃｈａｏ， ＳＨＩＨ Spray gun for painting
US10343178B2 (en) * 2014-01-29 2019-07-09 Honda Motor Co., Ltd. Rotary atomizing coating device and spray head
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FR3064198B1 (en) * 2017-03-23 2021-10-01 Air Liquide France Ind DEVICE FOR INJECTING A CRYOGENIC FLUID THROUGH THE BOTTOM OF A MIXER
IT201900021954A1 (en) 2019-11-22 2021-05-22 Demaclenko It S R L DISPENSER GROUP FOR ONE SNOW GENERATOR AND SNOW GENERATOR INCLUDING SAID DISPENSER GROUP
FR3117910B1 (en) * 2020-12-18 2023-04-07 Exel Ind Electrostatic powder coating robot, system and method
EP4190454B1 (en) * 2021-12-06 2025-11-19 coatingAI AG Coating production line system

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Also Published As

Publication number Publication date
US20110277685A1 (en) 2011-11-17
EP2361157A1 (en) 2011-08-31
KR101698432B1 (en) 2017-01-20
KR20110103985A (en) 2011-09-21
JP2012510363A (en) 2012-05-10
FR2939056A1 (en) 2010-06-04
CN102281955B (en) 2014-06-25
CN102281955A (en) 2011-12-14
ES2565841T3 (en) 2016-04-07
US8590807B2 (en) 2013-11-26
FR2939056B1 (en) 2011-01-07
WO2010063943A1 (en) 2010-06-10
JP5698143B2 (en) 2015-04-08
PL2361157T3 (en) 2016-08-31

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