EP3019278B1 - Spray nozzle for electrostatic spraying of a coating product and facility for spraying - Google Patents

Spray nozzle for electrostatic spraying of a coating product and facility for spraying Download PDF

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Publication number
EP3019278B1
EP3019278B1 EP14738474.7A EP14738474A EP3019278B1 EP 3019278 B1 EP3019278 B1 EP 3019278B1 EP 14738474 A EP14738474 A EP 14738474A EP 3019278 B1 EP3019278 B1 EP 3019278B1
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EP
European Patent Office
Prior art keywords
needle
spray nozzle
raised
nozzle according
coating product
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
EP14738474.7A
Other languages
German (de)
French (fr)
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EP3019278A1 (en
Inventor
Patrick Ballu
Michel DI-GIOIA
Gilles GOISOT
Philippe Provenaz
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 Kremlin 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.)
Filing date
Publication date
Application filed by Sames Kremlin SAS filed Critical Sames Kremlin SAS
Priority to PL14738474T priority Critical patent/PL3019278T3/en
Publication of EP3019278A1 publication Critical patent/EP3019278A1/en
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Publication of EP3019278B1 publication Critical patent/EP3019278B1/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
    • 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
    • B05B5/0255—Discharge apparatus, e.g. electrostatic spray guns spraying and depositing by electrostatic forces only
    • 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
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
    • 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
    • B05B5/053—Arrangements for supplying power, e.g. charging power

Definitions

  • the invention relates to an electrostatic spraying spray of coating product, and to a coating product spraying installation comprising such a sprayer.
  • An electrostatic coating sprayer for coating product electrostatically charges a coating material and provides a good transfer rate of the coating product to the substrate to be coated.
  • one end of a sprayer needle is raised to a high voltage of 10 to 200 kilo volts (kV), using a high voltage unit included in the sprayer.
  • a persistent issue for an electrostatic coating sprayer is to limit the length, bulk and overall weight of the sprayer to improve handling.
  • the choice of these parameters is dictated by the fact that a trigger and a rear part of the sprayer must be at the potential of the earth when, in order to load the coating product, one end of a needle of a sprayer is worn. at high voltage.
  • electrostatic spraying sprayers known coating product such as that described in the document WO-A2-01 / 66261 , are long, so difficult to handle.
  • the air confined between the needle and its housing in the nozzle of the sprayer ionizes rapidly, which generates the production of ozone, which corrodes the surrounding materials and ends up causing holes and electrical rampages that can be dangerous.
  • the invention more particularly intends to remedy by proposing an electrostatic spraying spray of coating product that is easy to handle and whose safety is improved.
  • the invention relates to an electrostatic spraying spray of coating product according to claim 1.
  • the first machining operations in the needle make it possible to produce lighter, smaller, more manageable sprayers whose safety during their operation is increased, since these first machining operations make it possible to increase the distance of electrical ramping for the same length of the barrel and the needle and thus improve the resistance of the sprayer to these ramps.
  • These reliefs make it possible to increase the electric creep distance, they also make it possible to produce sprayers of smaller dimensions than theoretically allow the intrinsic qualities of the materials used.
  • such an electrostatic coating product sprayer may incorporate one or more of the optional features of claims 2 to 12.
  • the invention also relates to a coating product spraying installation according to claim 13.
  • the installation 100 represented at figure 1 allows the electrostatic coating of an object not shown.
  • This installation 100 comprises an electrostatic spray gun 1 of coating product supplied with coating material, from a tank 20 of coating product, by a pipe 21.
  • the gun 1 is also connected to a source of pressurized air, through a pipe 31.
  • the air from the source 30 is used to spray the coating product by driving it from the gun 1 towards the gun. object to be coated.
  • a housing located in a gun 13 of the gun 1 in which a needle 3 slides, when an operator presses a trigger 6 or releases the trigger 6 of the gun 1.
  • the housing 4 defines a surface S4 translational guide of the needle 3 along a longitudinal axis Y4 of the housing 4.
  • the surface S4 is cylindrical with a circular base.
  • the needle 3 has a generally cylindrical shape except at a front end 3a, positioned near a spray outlet S of the coating product, which forms a triangular tip.
  • the needle 3 also comprises a rear portion 3c connected to the trigger 6 and a central portion 3b between the front end 3a and the rear portion 3c. It is through the link between the rear part 3c and the trigger 6 that the movement of the needle 3 is controlled.
  • the needle 3 consists of three different materials in three different parts.
  • the end 3a of the needle 3, intended to be raised to a high potential, is made of a first electrically conductive material of high Shore hardness, in particular greater than or equal to 55 HRC.
  • the end 3a is represented by an area comprising points at figures 1 , 2 and 3 .
  • the central part 3b of the needle is made of a second insulating material, while the rear part 3c of the needle 3, corresponding to the part of the needle 3 hatched with the figures 1 , 2 and 3 , is made of an electrically conductive and hard material.
  • the materials of parts 3a and 3b may be the same or different.
  • the housing 4 for receiving the needle 3 comprises a first groove 4a located on the outlet side S and the end 3a, at the connection between the end 3a and the central part 3b of the needle 3.
  • a first seal 41 is disposed in the groove 4a, around the needle 3 with which it is in sliding contact.
  • This seal 41 ensures a seal of the housing 4, vis-à-vis elements external to the gun 1 and vis-à-vis the coating product which, during the spraying of coating product, leads through the conduit 2 at the end 3a of the needle 3.
  • the housing 4 comprises a second groove 4b located on the side of the trigger 6 and the rear portion 3c, opposite the first groove 4a.
  • a second seal 42 is disposed in the groove 4b, around the needle 3 with which it is in sliding contact.
  • This second seal 4b provides a good seal of the housing 4 vis-à-vis the intrusion of bodies or products from the outside such as dust, solvents, paint residue.
  • the materials of the joints 41 and 42 are adapted to the (x) material (s) constituting the end 3a and the rear portion 3c to ensure a tight support of the needle 3 against these seals.
  • This duct 5 comprises a first section 5a and a second section 5b between which is a valve 7 for controlling the flow of air.
  • the second section 5b opens near the end 3a of the needle 3 at the outlet S.
  • the air valve 7 comprises a valve 7a adapted to bear against a seat 7b, of corresponding shape, under the effect of a return force R exerted by a spring 50 held in position by a plug 51 forming a point fixed support for this spring 50.
  • the valve 7a is integral in translation with the needle 3.
  • the spring 50 keeps the needle 3 in a position preventing the circulation of the coating product, the conduit 2 to the output S, when no force is exerted on the trigger 6 of the gun 1.
  • the end 3a of the needle 3 is shaped to bear against a seat 33 of corresponding shape under the effect
  • the needle 3 and the seat 33 together form a valve 63 for controlling the flow of coating product.
  • the needle 3 forms the movable valve of the valve 63.
  • the trigger 6 is articulated on a body 15 of the pistol about an axis X6 perpendicular to the axis Y4. It allows the opening and closing of the air valve 7, as well as the movements of the needle 3 parallel to the axis Y4. More specifically, the trigger 6 is in abutment against the valve 7a and, when it undergoes a force opposite to the return force R, to exert on the valve 7a a force opposite to the return force R to shift axially, along the axis Y4, the valve 7a with respect to its seat 7b. This makes it possible to set the needle 3 in motion parallel to the axis Y4.
  • the spring 50 pushes the valve 7b and the needle 3 towards, respectively, the interruption position of the air flow duct 5 and the coating product duct 2.
  • the trigger 6 allows thus to control the circulation of coating product and pressurized air in the circulation ducts 2 and 5.
  • the gun 1 is also connected to a high-voltage generator 10, by an electric cable 11 which makes it possible to supply power to a high voltage unit 12, arranged in the barrel 13 of the gun 1.
  • the generator 10 is itself supplied with current from the mains by means of a cable 17.
  • the high voltage unit 12 makes it possible to bring to a high voltage, that is to say to a potential whose absolute value is between 10 kV and 200 kV, the end 3a of the needle 3 to which it is electrically connected by means not shown.
  • first machining 8 are regularly formed on the outer contour of the central portion 3b of the needle 3, opposite the housing 4, along the needle 3, first machining 8 are regularly formed.
  • the central portion 3b has a cylindrical envelope surface S3b with a circular base of diameter D3.
  • the first machinations 8 form recessed portions, with respect to the envelope surface S3b of the needle 3, which have a diameter D8 less than the diameter D3 of the envelope surface S3b.
  • the diameter D8 of the recessed portions formed by the first machining operations 8 is preferably between 15% and 60%, of the diameter D3 of the envelope surface S3b.
  • U8 is a length, measured parallel to the axis Y4, on which each first machining 8 extends.
  • second machining operations 9 are arranged opposite the first machining operations 8.
  • the second machining operations 9 form recessed portions with respect to the guide surface S4 of the needle 3.
  • the diameter D9 of the parts hollow formed by the second machining 9 is greater than the diameter D4 of the surface S4 for receiving and guiding the needle 3.
  • the diameter D9 of the recessed portions is preferably between 101% and 200% of the diameter D4 of the surface S4.
  • U9 is a length, measured parallel to the axis Y4, on which each second machining 9 extends.
  • Each first machining 8 extends parallel to the axis Y4 along the length U8.
  • the sum of the lengths U8 over which each first machining 8 extends is between 10% and 50% of the length U3b of the central part 3b of the needle 3, measured parallel to the axis Y4.
  • Each second machining 9 extends over a length U9 greater than the length U8.
  • the length U9 is between 120% and 200% of the length U8.
  • the first machining operations 8 and the second machining operations 9 make it possible to increase the electrical ramping distance, compared to a configuration where the needle and the housing do not include machining, and thus to prevent the trigger 6 or a part 16 rear of the gun 1 is at a potential different from that of the earth when the end 3a of the needle 3 is raised to high voltage.
  • the second machining 9 are formed on a length U9 greater than the length U8 on which are formed the first machining 8, regardless of the position of the needle 3 in the housing 4, the electrical creep distance does not change not.
  • a volume V1 left free between the needle 3 and its housing 4 is filled with an electrically insulating product.
  • This product may be, for example, dielectric grease. It allows by its properties, to increase the length of the ramping path between the front end 3a and the rear part 3c and, thus, to make a gun 13 shorter than would allow the intrinsic qualities of the materials used for the barrel 13 and the needle 3.
  • this electrically insulating product prevents any formation of ozone. Indeed, in the absence of this insulating product, the air confined between the needle 3 and its housing 4 in the barrel 13 ionizes rapidly, which generates ozone. Gold is a harmful gas for health and corrodes the components of the needle 3 and its housing 4, which eventually cause electrical rampages that can reach the hand of the operator in the case of a pistol 1 manual.
  • a needle 203 is generally similar to the needle 3 of the first embodiment but includes first different machining 208.
  • the first machining 208 form helical recessed portions, with respect to the envelope surface S203b of the central portion 203b of the needle 203, around the central portion 203b.
  • the first machining thus form a first hollow propeller with respect to the envelope surface S203b of the central portion 203b of the needle 203.
  • a needle 303 is generally similar to the needle 203 of the second embodiment but comprises first reliefs 308 different from the first machining operations 208.
  • the elements similar to those of the first embodiment bear the same references. digital. In the following, we will describe what distinguishes the third embodiment of the first embodiment.
  • the first reliefs 308 form a helix positioned around a central portion 303b of the needle 303. More specifically, the central portion 303b comprises a generally cylindrical portion 314 and the first reliefs 308 project from the cylindrical portion 314. D314 the diameter of the cylindrical portion 314 and D308 the diameter of the first relief 308.
  • the diameter D308 of the helix formed by the first relief 308 is greater than the diameter D314 of the cylindrical portion 314.
  • the diameter D308 is between 15% and 60% of the diameter D314.
  • the housing of the barrel 13 comprises second machining 309 which form opposite the first reliefs 308, with respect to a surface S4 for guiding the needle 303, a second hollow propeller.
  • U308 denotes a first width, measured along the longitudinal axis Y4, of the projecting helix 308.
  • the first width U308 is generally constant around the central portion 303b.
  • U309 denotes a second width, measured along the longitudinal axis Y4, of the second hollow propeller 309.
  • the second width U309 is generally constant along the housing 4.
  • the protruding helix 308 and the second recessed helix 309 are of complementary shapes so that the protruding helix 308 is adapted to be screwed into the second hollow helix 309.
  • the projecting helix 308 and the second hollow propeller 309 are of the same direction.
  • the first width U308 is between 10% and 50% of the second width U309. More specifically, the second width U309 is greater than the first width U308 so that the second width U309 is greater than the sum of the first width U308 and a longitudinal displacement in translation of the needle 303.
  • the longitudinal displacement in translation of the needle 303 corresponds to the distance traveled by the needle 303 along the longitudinal axis Y4, between the position of the needle 303 when the trigger 6 of the pistol 1 is released and the position of the needle 303 when the trigger 6 is fully engaged.
  • first and second machining form recessed portions of any shape.
  • the needle 203 comprises a single first machining forming the first hollow propeller.
  • the needle 303 comprises a single first relief forming a protruding helix.
  • the machining is not arranged regularly along the central portion 3b of the needle 3 and the housing 4.
  • the generator 10 is supplied with current from an autonomous source.
  • the housing 4 comprises a single second machining forming the second hollow propeller.
  • the projecting helix 308 and the second recessed helix 309 of the third embodiment are of opposite directions.
  • the needle and its housing are of complementary shape but not of cylindrical shape.
  • the hollow parts are formed by projecting elements of the needle 3 and the housing 4.
  • these elements are either integral with the needle 3 or the housing 4, or parts reported on the needle 3 or the housing 4.
  • gun 1 shown is a manual electrostatic spray coating product sprayer.
  • this gun is an automatic coating product sprayer.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)

Description

L'invention a trait à un pulvérisateur de projection électrostatique de produit de revêtement, ainsi qu'à une installation de projection de produit de revêtement comprenant un tel pulvérisateur.The invention relates to an electrostatic spraying spray of coating product, and to a coating product spraying installation comprising such a sprayer.

Un pulvérisateur de projection électrostatique de produit de revêtement permet de charger électrostatiquement un produit de revêtement et offre un bon taux de transfert du produit de revêtement sur le support à recouvrir. Lorsque le produit de revêtement est destiné à être chargé, une extrémité d'une aiguille du pulvérisateur est portée à une haute tension pouvant aller de 10 à 200 Kilo volts (kV), à l'aide d'une unité à haute tension comprise dans le pulvérisateur.An electrostatic coating sprayer for coating product electrostatically charges a coating material and provides a good transfer rate of the coating product to the substrate to be coated. When the coating material is to be loaded, one end of a sprayer needle is raised to a high voltage of 10 to 200 kilo volts (kV), using a high voltage unit included in the sprayer.

Un enjeu persistant pour un pulvérisateur de projection électrostatique de produit de revêtement est de limiter la longueur, l'encombrement et le poids général du pulvérisateur pour en améliorer la maniabilité. Le choix de ces paramètres est dicté par le fait qu'une gâchette et une partie arrière du pulvérisateur doivent être obligatoirement au potentiel de la terre lorsque, afin de charger le produit de revêtement, une extrémité d'une aiguille d'un pulvérisateur est portée à la haute tension.A persistent issue for an electrostatic coating sprayer is to limit the length, bulk and overall weight of the sprayer to improve handling. The choice of these parameters is dictated by the fact that a trigger and a rear part of the sprayer must be at the potential of the earth when, in order to load the coating product, one end of a needle of a sprayer is worn. at high voltage.

Il est ainsi connu des documents WO-A2-01/66261 , DE-A-4106564 , JP-A-2008290046 et US-A1-2012/031329 un pulvérisateur de projection électrostatique qui comprend une aiguille formant un clapet mobile d'une vanne de contrôle de la pulvérisation de produit de revêtement et une unité haute tension apte à porter à la haute tension une extrémité avant de l'aiguille. Cependant, dans le domaine de la projection de produit de revêtement au moyen d'un pulvérisateur de projection électrostatique, la norme FM7260, qui est la plus contraignante à l'heure actuelle, préconise d'observer aucun rampage électrique le long d'une aiguille ou d'un canon du pulvérisateur, lorsqu'on applique à une extrémité de l'aiguille, pendant une minute, une tension égale à 1,5 fois la tension maximale que peut générer une unité haute tension comprise dans le pulvérisateur. Ainsi, les pulvérisateurs de projection électrostatique de produit de revêtement connus, tel que celui décrit dans le document WO-A2-01/66261 , sont longs, donc difficiles à manier. De plus, dans ce type de pulvérisateur, l'air confiné entre l'aiguille et son logement dans le canon du pulvérisateur s'ionise rapidement, ce qui génère la production d'ozone, qui corrode les matériaux environnants et finit par provoquer des perçages et des rampages électriques qui peuvent être dangereux.It is thus known from the documents WO-A2-01 / 66261 , DE-A-4106564 , JP-A-2008290046 and US-A1-2012 / 031329 an electrostatic spraying sprayer which comprises a needle forming a movable valve of a coating product spray control valve and a high voltage unit adapted to bring a forward end of the needle to the high voltage. However, in the field of projection of coating material by means of an electrostatic spraying device, the FM7260 standard, which is the most restrictive at the present time, recommends observing no electric ramping along a needle. or a spray gun, when a voltage equal to 1.5 times the maximum voltage a high-voltage unit in the sprayer can generate at one end of the needle. Thus, electrostatic spraying sprayers known coating product, such as that described in the document WO-A2-01 / 66261 , are long, so difficult to handle. In addition, in this type of sprayer, the air confined between the needle and its housing in the nozzle of the sprayer ionizes rapidly, which generates the production of ozone, which corrodes the surrounding materials and ends up causing holes and electrical rampages that can be dangerous.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un pulvérisateur de projection électrostatique de produit de revêtement facile à manipuler et dont la sécurité est améliorée.It is these drawbacks that the invention more particularly intends to remedy by proposing an electrostatic spraying spray of coating product that is easy to handle and whose safety is improved.

A cet effet, l'invention concerne un pulvérisateur de projection électrostatique de produit de revêtement selon la revendication 1.For this purpose, the invention relates to an electrostatic spraying spray of coating product according to claim 1.

Grâce à l'invention, les premiers usinages ménagés dans l'aiguille permettent de réaliser des pulvérisateurs plus légers, plus petits, plus maniables et dont la sécurité au cours de leur fonctionnement est augmentée, puisque ces premiers usinages permettent d'augmenter la distance de rampage électrique pour une même longueur du canon et de l'aiguille et ainsi d'améliorer la résistance du pulvérisateur à ces rampages. Ces reliefs permettent d'augmenter la distance de rampage électrique, ils permettent aussi de réaliser des pulvérisateurs de dimensions inférieures à ce que permettent théoriquement les qualités intrinsèques des matériaux mis en œuvre.Thanks to the invention, the first machining operations in the needle make it possible to produce lighter, smaller, more manageable sprayers whose safety during their operation is increased, since these first machining operations make it possible to increase the distance of electrical ramping for the same length of the barrel and the needle and thus improve the resistance of the sprayer to these ramps. These reliefs make it possible to increase the electric creep distance, they also make it possible to produce sprayers of smaller dimensions than theoretically allow the intrinsic qualities of the materials used.

Selon des aspects avantageux mais non obligatoires de l'invention, un tel pulvérisateur électrostatique de produit de revêtement peut incorporer une ou plusieurs des caractéristiques optionnelles des revendications 2 à 12.According to advantageous but not obligatory aspects of the invention, such an electrostatic coating product sprayer may incorporate one or more of the optional features of claims 2 to 12.

L'invention concerne également une installation de projection de produit de revêtement selon la revendication 13.The invention also relates to a coating product spraying installation according to claim 13.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaitront plus clairement à la lumière de la description qui va suivre de deux modes de réalisation d'un pistolet de projection électrostatique de produit de revêtement et d'une installation conforme à son principe, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés dans lesquels :

  • la figure 1 est une représentation schématique, en coupe, d'une installation comprenant un pistolet conforme à un premier mode de réalisation de l'invention ;
  • la figure 2 est une représentation partielle, à plus grande échelle, du détail II de la figure 1,
  • la figure 3 est une représentation en perspective d'une aiguille du pistolet des figures 1 et 2,
  • la figure 4 est une représentation en perspective d'une aiguille d'un pistolet conforme à un deuxième mode de réalisation,
  • la figure 5 est une représentation partielle d'un canon d'un pistolet conforme à un troisième mode de réalisation de l'invention,
  • la figure 6 est une représentation à plus grande échelle du détail VI de la figure 5.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of two embodiments of an electrostatic spray gun coating product and a facility according to its principle, given purely by way of example and with reference to the appended drawings in which:
  • the figure 1 is a schematic representation, in section, of an installation comprising a gun according to a first embodiment of the invention;
  • the figure 2 is a partial representation, on a larger scale, of detail II of the figure 1 ,
  • the figure 3 is a perspective representation of a pistol needle figures 1 and 2 ,
  • the figure 4 is a perspective representation of a needle of a pistol according to a second embodiment,
  • the figure 5 is a partial representation of a gun barrel according to a third embodiment of the invention,
  • the figure 6 is an enlarged representation of detail VI of the figure 5 .

L'installation 100 représentée à la figure 1 permet le revêtement par voie électrostatique d'un objet non représenté. Cette installation 100 comprend un pistolet 1 de projection électrostatique de produit de revêtement alimenté en produit de revêtement, à partir d'un réservoir 20 de produit de revêtement, par un tuyau 21.The installation 100 represented at figure 1 allows the electrostatic coating of an object not shown. This installation 100 comprises an electrostatic spray gun 1 of coating product supplied with coating material, from a tank 20 of coating product, by a pipe 21.

Le pistolet 1 est également relié à une source 30 d'air sous pression, par un tuyau 31. L'air provenant de la source 30 est utilisé pour pulvériser le produit de revêtement en l'entrainant à partir du pistolet 1 en direction de l'objet à revêtir.The gun 1 is also connected to a source of pressurized air, through a pipe 31. The air from the source 30 is used to spray the coating product by driving it from the gun 1 towards the gun. object to be coated.

On note 2 un conduit de circulation de produit de revêtement à l'intérieur du pistolet 1.There is 2 a coating product circulation duct inside the gun 1.

On note 4 un logement situé dans un canon 13 du pistolet 1 dans lequel une aiguille 3 coulisse, lorsqu'un opérateur appuie sur une gâchette 6 ou relâche la gâchette 6 du pistolet 1. Le logement 4 définit une surface S4 de guidage en translation de l'aiguille 3 suivant un axe longitudinal Y4 du logement 4. La surface S4 est cylindrique à base circulaire.Note 4 a housing located in a gun 13 of the gun 1 in which a needle 3 slides, when an operator presses a trigger 6 or releases the trigger 6 of the gun 1. The housing 4 defines a surface S4 translational guide of the needle 3 along a longitudinal axis Y4 of the housing 4. The surface S4 is cylindrical with a circular base.

L'aiguille 3 a une forme globalement cylindrique sauf au niveau d'une extrémité avant 3a, positionnée à proximité d'une sortie S de pulvérisation du produit de revêtement, qui forme une pointe triangulaire. L'aiguille 3 comprend aussi une partie arrière 3c reliée à la gâchette 6 et une partie centrale 3b comprise entre l'extrémité avant 3a et la partie arrière 3c. C'est par le lien entre la partie arrière 3c et la gâchette 6 que le mouvement de l'aiguille 3 est commandé.The needle 3 has a generally cylindrical shape except at a front end 3a, positioned near a spray outlet S of the coating product, which forms a triangular tip. The needle 3 also comprises a rear portion 3c connected to the trigger 6 and a central portion 3b between the front end 3a and the rear portion 3c. It is through the link between the rear part 3c and the trigger 6 that the movement of the needle 3 is controlled.

L'aiguille 3 est constituée de trois matériaux différents en trois parties différentes. L'extrémité 3a de l'aiguille 3, destinée à être portée à un haut potentiel, est constituée d'un premier matériau électriquement conducteur de grande dureté Shore, notamment supérieure ou égal à 55 HRC. L'extrémité 3a est représentée par une zone comprenant des points aux figures 1, 2 et 3. La partie centrale 3b de l'aiguille est constituée d'un deuxième matériau isolant, alors que la partie arrière 3c de l'aiguille 3, correspondant à la partie de l'aiguille 3 hachurée aux figures 1, 2 et 3, est constituée d'un matériau électriquement conducteur et dur. Les matériaux des parties 3a et 3b peuvent être identiques ou différents.The needle 3 consists of three different materials in three different parts. The end 3a of the needle 3, intended to be raised to a high potential, is made of a first electrically conductive material of high Shore hardness, in particular greater than or equal to 55 HRC. The end 3a is represented by an area comprising points at figures 1 , 2 and 3 . The central part 3b of the needle is made of a second insulating material, while the rear part 3c of the needle 3, corresponding to the part of the needle 3 hatched with the figures 1 , 2 and 3 , is made of an electrically conductive and hard material. The materials of parts 3a and 3b may be the same or different.

Le logement 4 de réception de l'aiguille 3 comprend une première gorge 4a située du côté de la sortie S et de l'extrémité 3a, au niveau de la liaison entre l'extrémité 3a et la partie centrale 3b de l'aiguille 3. Un premier joint 41 est disposé dans la gorge 4a, autour de l'aiguille 3 avec laquelle il est en contact glissant. Ce joint 41 assure une étanchéité du logement 4, vis-à-vis d'éléments extérieurs au pistolet 1 et vis-à-vis du produit de revêtement qui, lors de la pulvérisation de produit de revêtement, débouche par le conduit 2 au niveau de l'extrémité 3a de l'aiguille 3. De plus, le logement 4 comprend une deuxième gorge 4b située du côté de la gâchette 6 et de la partie arrière 3c, à l'opposé de la première gorge 4a. Un deuxième joint 42 est disposé dans la gorge 4b, autour de l'aiguille 3 avec laquelle il est en contact glissant. Ce deuxième joint 4b offre une bonne étanchéité du logement 4 vis-à-vis de l'intrusion de corps ou produits venant de l'extérieur tels que des poussières, solvants, résidus de peinture. Les matériaux des joints 41 et 42 sont adaptés au(x) matériau(x) composant l'extrémité 3a et la partie arrière 3c pour garantir un appui étanche de l'aiguille 3 contre ces joints.The housing 4 for receiving the needle 3 comprises a first groove 4a located on the outlet side S and the end 3a, at the connection between the end 3a and the central part 3b of the needle 3. A first seal 41 is disposed in the groove 4a, around the needle 3 with which it is in sliding contact. This seal 41 ensures a seal of the housing 4, vis-à-vis elements external to the gun 1 and vis-à-vis the coating product which, during the spraying of coating product, leads through the conduit 2 at the end 3a of the needle 3. In addition, the housing 4 comprises a second groove 4b located on the side of the trigger 6 and the rear portion 3c, opposite the first groove 4a. A second seal 42 is disposed in the groove 4b, around the needle 3 with which it is in sliding contact. This second seal 4b provides a good seal of the housing 4 vis-à-vis the intrusion of bodies or products from the outside such as dust, solvents, paint residue. The materials of the joints 41 and 42 are adapted to the (x) material (s) constituting the end 3a and the rear portion 3c to ensure a tight support of the needle 3 against these seals.

On note 5, un conduit de circulation d'air à l'intérieur du pistolet 1. Ce conduit 5 comprend un premier tronçon 5a et un deuxième tronçon 5b entre lesquels se trouve une vanne 7 de contrôle de l'écoulement de l'air. Le deuxième tronçon 5b débouche à proximité de l'extrémité 3a de l'aiguille 3 au niveau de la sortie S.There is 5, an air flow duct inside the gun 1. This duct 5 comprises a first section 5a and a second section 5b between which is a valve 7 for controlling the flow of air. The second section 5b opens near the end 3a of the needle 3 at the outlet S.

La vanne 7 d'air comprend un clapet 7a adapté pour venir en appui contre un siège 7b, de forme correspondante, sous l'effet d'un effort de rappel R exercé par un ressort 50 maintenu en position par un bouchon 51 formant un point fixe d'appui pour ce ressort 50. Le clapet 7a est solidaire en translation de l'aiguille 3. Ainsi, le ressort 50 permet de maintenir l'aiguille 3 dans une position empêchant la circulation du produit de revêtement, du conduit 2 vers la sortie S, lorsqu'aucun effort n'est exercé sur la gâchette 6 du pistolet 1. Plus précisément, l'extrémité 3a de l'aiguille 3 est de forme adaptée pour venir en appui contre un siège 33 de forme correspondante sous l'effet de l'effort de rappel R. Ainsi, l'aiguille 3 et le siège 33 forment ensemble une vanne 63 de contrôle de l'écoulement de produit de revêtement. L'aiguille 3 forme le clapet mobile de la vanne 63.The air valve 7 comprises a valve 7a adapted to bear against a seat 7b, of corresponding shape, under the effect of a return force R exerted by a spring 50 held in position by a plug 51 forming a point fixed support for this spring 50. The valve 7a is integral in translation with the needle 3. Thus, the spring 50 keeps the needle 3 in a position preventing the circulation of the coating product, the conduit 2 to the output S, when no force is exerted on the trigger 6 of the gun 1. More specifically, the end 3a of the needle 3 is shaped to bear against a seat 33 of corresponding shape under the effect Thus, the needle 3 and the seat 33 together form a valve 63 for controlling the flow of coating product. The needle 3 forms the movable valve of the valve 63.

La gâchette 6 est articulée sur un corps 15 du pistolet autour d'un axe X6 perpendiculaire à l'axe Y4. Elle permet l'ouverture et la fermeture de la vanne d'air 7, ainsi que les mouvements de l'aiguille 3 parallèlement à l'axe Y4. Plus précisément, la gâchette 6 est en appui contre le clapet 7a et permet, lorsqu'elle subit un effort opposé à l'effort de rappel R, d'exercer sur le clapet 7a un effort opposé à l'effort de rappel R pour décaler axialement, le long de l'axe Y4, le clapet 7a par rapport à son siège 7b. Ceci permet de mettre en mouvement l'aiguille 3 parallèlement à l'axe Y4. Lorsqu'on relâche la gâchette 6, le ressort 50 repousse le clapet 7b et l'aiguille 3 vers, respectivement, la position d'interruption du conduit de circulation d'air 5 et du conduit de produit de revêtement 2. La gâchette 6 permet ainsi de contrôler la circulation de produit de revêtement et d'air sous pression dans les conduits de circulation 2 et 5.The trigger 6 is articulated on a body 15 of the pistol about an axis X6 perpendicular to the axis Y4. It allows the opening and closing of the air valve 7, as well as the movements of the needle 3 parallel to the axis Y4. More specifically, the trigger 6 is in abutment against the valve 7a and, when it undergoes a force opposite to the return force R, to exert on the valve 7a a force opposite to the return force R to shift axially, along the axis Y4, the valve 7a with respect to its seat 7b. This makes it possible to set the needle 3 in motion parallel to the axis Y4. When releasing the trigger 6, the spring 50 pushes the valve 7b and the needle 3 towards, respectively, the interruption position of the air flow duct 5 and the coating product duct 2. The trigger 6 allows thus to control the circulation of coating product and pressurized air in the circulation ducts 2 and 5.

Le pistolet 1 est également relié à un générateur de haute tension 10, par un câble électrique 11 qui permet d'alimenter en courant une unité haute tension 12, disposée dans le canon 13 du pistolet 1. Le générateur 10 est lui-même alimenté en courant à partir du secteur, au moyen d'un câble 17.The gun 1 is also connected to a high-voltage generator 10, by an electric cable 11 which makes it possible to supply power to a high voltage unit 12, arranged in the barrel 13 of the gun 1. The generator 10 is itself supplied with current from the mains by means of a cable 17.

L'unité haute tension 12 permet de porter à une haute tension, c'est-à-dire à un potentiel dont la valeur absolue est comprise entre 10 kV et 200 kV, l'extrémité 3a de l'aiguille 3 à laquelle elle est raccordée électriquement par des moyens non représentés.The high voltage unit 12 makes it possible to bring to a high voltage, that is to say to a potential whose absolute value is between 10 kV and 200 kV, the end 3a of the needle 3 to which it is electrically connected by means not shown.

Sur le contour extérieur de la partie centrale 3b de l'aiguille 3, en regard du logement 4, le long de l'aiguille 3, des premiers usinages 8 sont régulièrement ménagés. La partie centrale 3b a une surface d'enveloppe S3b de forme cylindrique à base circulaire de diamètre D3. Les premiers usinages 8 forment des parties en creux, par rapport à la surface d'enveloppe S3b de l'aiguille 3, qui ont un diamètre D8 inférieur au diamètre D3 de la surface d'enveloppe S3b. Le diamètre D8 des parties en creux formées par les premiers usinages 8 est compris, de préférence, entre 15% et 60%, du diamètre D3 de la surface d'enveloppe S3b.On the outer contour of the central portion 3b of the needle 3, opposite the housing 4, along the needle 3, first machining 8 are regularly formed. The central portion 3b has a cylindrical envelope surface S3b with a circular base of diameter D3. The first machinations 8 form recessed portions, with respect to the envelope surface S3b of the needle 3, which have a diameter D8 less than the diameter D3 of the envelope surface S3b. The diameter D8 of the recessed portions formed by the first machining operations 8 is preferably between 15% and 60%, of the diameter D3 of the envelope surface S3b.

On note U8 une longueur, mesurée parallèlement à l'axe Y4, sur laquelle s'étend chaque premier usinage 8.U8 is a length, measured parallel to the axis Y4, on which each first machining 8 extends.

De même, dans le logement 4, des deuxièmes usinages 9 sont ménagés en regard des premiers usinages 8. Les deuxièmes usinages 9 forment des parties en creux par rapport à la surface S4 de guidage de l'aiguille 3. Le diamètre D9 des parties en creux formées par les deuxièmes usinages 9 est supérieur au diamètre D4 de la surface S4 de réception et de guidage de l'aiguille 3. Le diamètre D9 des parties en creux est compris de préférence entre 101% et 200% du diamètre D4 de la surface S4.Similarly, in the housing 4, second machining operations 9 are arranged opposite the first machining operations 8. The second machining operations 9 form recessed portions with respect to the guide surface S4 of the needle 3. The diameter D9 of the parts hollow formed by the second machining 9 is greater than the diameter D4 of the surface S4 for receiving and guiding the needle 3. The diameter D9 of the recessed portions is preferably between 101% and 200% of the diameter D4 of the surface S4.

On note U9 une longueur, mesurée parallèlement à l'axe Y4, sur laquelle s'étend chaque deuxième usinage 9.U9 is a length, measured parallel to the axis Y4, on which each second machining 9 extends.

Chaque premier usinage 8 s'étend parallèlement à l'axe Y4 sur la longueur U8. La somme des longueurs U8 sur lesquelles s'étend chaque premier usinage 8 est comprise entre 10% et 50% de la longueur U3b de la partie centrale 3b de l'aiguille 3, mesurée parallèlement à l'axe Y4.Each first machining 8 extends parallel to the axis Y4 along the length U8. The sum of the lengths U8 over which each first machining 8 extends is between 10% and 50% of the length U3b of the central part 3b of the needle 3, measured parallel to the axis Y4.

Chaque deuxième usinage 9 s'étend sur une longueur U9 supérieure à la longueur U8. De préférence la longueur U9 est comprise entre 120% et 200% de la longueur U8. Les premiers usinages 8 et les deuxièmes usinages 9 permettent d'augmenter la distance de rampage électrique, par rapport à une configuration où l'aiguille et le logement ne comprennent pas d'usinage, et ainsi d'empêcher que la gâchette 6 ou une partie 16 arrière du pistolet 1 soit à un potentiel différent de celui de la terre lorsque l'extrémité 3a de l'aiguille 3 est portée à la haute tension.Each second machining 9 extends over a length U9 greater than the length U8. Preferably the length U9 is between 120% and 200% of the length U8. The first machining operations 8 and the second machining operations 9 make it possible to increase the electrical ramping distance, compared to a configuration where the needle and the housing do not include machining, and thus to prevent the trigger 6 or a part 16 rear of the gun 1 is at a potential different from that of the earth when the end 3a of the needle 3 is raised to high voltage.

En outre, comme les deuxièmes usinages 9 sont ménagés sur une longueur U9 supérieure à la longueur U8 sur laquelle sont ménagés les premiers usinages 8, quelle que soit la position de l'aiguille 3 dans le logement 4, la distance de rampage électrique ne change pas.In addition, as the second machining 9 are formed on a length U9 greater than the length U8 on which are formed the first machining 8, regardless of the position of the needle 3 in the housing 4, the electrical creep distance does not change not.

Par ailleurs, un volume V1 laissé libre entre l'aiguille 3 et son logement 4 est rempli d'un produit électriquement isolant. Ce produit peut être, par exemple, de la graisse diélectrique. Il permet par ses propriétés, d'augmenter la longueur du chemin de rampage entre l'extrémité avant 3a et la partie arrière 3c et, ainsi, de réaliser un canon 13 plus court que ne le permettrait les qualités intrinsèques des matériaux utilisés pour le canon 13 et l'aiguille 3. De plus, ce produit électriquement isolant prévient toute formation d'ozone. En effet, en l'absence de ce produit isolant, l'air confiné entre l'aiguille 3 et son logement 4 dans le canon 13 s'ionise rapidement, ce qui génère de l'ozone. Or l'ozone est un gaz nocif pour la santé et corrode les matériaux composants l'aiguille 3 et son logement 4, ce qui finit par provoquer des rampages électriques qui peuvent atteindre la main de l'opérateur dans le cas d'un pistolet 1 manuel.Moreover, a volume V1 left free between the needle 3 and its housing 4 is filled with an electrically insulating product. This product may be, for example, dielectric grease. It allows by its properties, to increase the length of the ramping path between the front end 3a and the rear part 3c and, thus, to make a gun 13 shorter than would allow the intrinsic qualities of the materials used for the barrel 13 and the needle 3. In addition, this electrically insulating product prevents any formation of ozone. Indeed, in the absence of this insulating product, the air confined between the needle 3 and its housing 4 in the barrel 13 ionizes rapidly, which generates ozone. Gold is a harmful gas for health and corrodes the components of the needle 3 and its housing 4, which eventually cause electrical rampages that can reach the hand of the operator in the case of a pistol 1 manual.

Dans le deuxième mode de réalisation du pistolet représenté à la figure 4, une aiguille 203 est globalement similaire à l'aiguille 3 du premier mode de réalisation mais comprend des premiers usinages 208 différents.In the second embodiment of the gun shown in figure 4 a needle 203 is generally similar to the needle 3 of the first embodiment but includes first different machining 208.

Dans le deuxième mode de réalisation les éléments semblables à ceux du premier mode de réalisation portent les mêmes références numériques augmentées de 200.In the second embodiment the elements similar to those of the first embodiment bear the same numerical references increased by 200.

Dans ce qui suit on décrit ce qui distingue le deuxième mode de réalisation du premier mode de réalisation.In the following, we will describe what distinguishes the second embodiment of the first embodiment.

Ainsi, les premiers usinages 208 forment des parties en creux en forme d'hélice, par rapport à la surface d'enveloppe S203b de la partie centrale 203b de l'aiguille 203, autour de la partie centrale 203b. Les premiers usinages forment donc une première hélice en creux par rapport à la surface d'enveloppe S203b de la partie centrale 203b de l'aiguille 203. De même, des deuxièmes usinages ménagés dans le logement correspondant du canon, non représentés, forment en regard de ces premiers usinages 208, par rapport à la surface de guidage de l'aiguille 203, une deuxième hélice en creux.Thus, the first machining 208 form helical recessed portions, with respect to the envelope surface S203b of the central portion 203b of the needle 203, around the central portion 203b. The first machining thus form a first hollow propeller with respect to the envelope surface S203b of the central portion 203b of the needle 203. Similarly, second machining operations in the corresponding housing of the barrel, not shown, form opposite of these first machining 208, relative to the guide surface of the needle 203, a second hollow propeller.

Dans le troisième mode de réalisation du pistolet représenté aux figures 5 et 6, une aiguille 303 est globalement similaire à l'aiguille 203 du deuxième mode de réalisation mais comprend des premiers reliefs 308 différents des premiers usinages 208. Dans le troisième mode de réalisation, les éléments semblables à ceux du premier mode de réalisation portent les mêmes références numériques. Dans ce qui suit on décrit ce qui distingue le troisième mode de réalisation du premier mode de réalisation.In the third embodiment of the gun shown in Figures 5 and 6 a needle 303 is generally similar to the needle 203 of the second embodiment but comprises first reliefs 308 different from the first machining operations 208. In the third embodiment, the elements similar to those of the first embodiment bear the same references. digital. In the following, we will describe what distinguishes the third embodiment of the first embodiment.

Les premiers reliefs 308 forment une hélice positionnée autour d'une partie centrale 303b de l'aiguille 303. Plus précisément, la partie centrale 303b comprend une portion 314 globalement cylindrique et les premiers reliefs 308 sont en saillie de la portion cylindrique 314. On note D314 le diamètre de la portion cylindrique 314 et D308 le diamètre du premier relief 308.The first reliefs 308 form a helix positioned around a central portion 303b of the needle 303. More specifically, the central portion 303b comprises a generally cylindrical portion 314 and the first reliefs 308 project from the cylindrical portion 314. D314 the diameter of the cylindrical portion 314 and D308 the diameter of the first relief 308.

Le diamètre D308 de l'hélice formée par le premier relief 308 est supérieur au diamètre D314 de la portion cylindrique 314. De préférence, le diamètre D308 est compris entre 15% et 60% du diamètre D314.The diameter D308 of the helix formed by the first relief 308 is greater than the diameter D314 of the cylindrical portion 314. Preferably, the diameter D308 is between 15% and 60% of the diameter D314.

De plus, de manière analogue à ce qui a été présenté pour le deuxième mode de réalisation, le logement du canon 13 comprend des deuxièmes usinages 309 qui forment en regard des premiers reliefs 308, par rapport à une surface S4 de guidage de l'aiguille 303, une deuxième hélice en creux.In addition, similarly to what has been presented for the second embodiment, the housing of the barrel 13 comprises second machining 309 which form opposite the first reliefs 308, with respect to a surface S4 for guiding the needle 303, a second hollow propeller.

On note U308 une première largeur, mesurée suivant l'axe longitudinal Y4, de l'hélice en saillie 308. La première largeur U308 est globalement constante autour de la partie centrale 303b.U308 denotes a first width, measured along the longitudinal axis Y4, of the projecting helix 308. The first width U308 is generally constant around the central portion 303b.

De même, on note U309 une deuxième largeur, mesurée suivant l'axe longitudinal Y4, de la deuxième hélice en creux 309. La deuxième largeur U309 est globalement constante le long du logement 4.Similarly, U309 denotes a second width, measured along the longitudinal axis Y4, of the second hollow propeller 309. The second width U309 is generally constant along the housing 4.

L'hélice en saillie 308 et la deuxième hélice en creux 309 sont de formes complémentaires de sorte que l'hélice en saillie 308 est apte à être vissé dans la deuxième hélice en creux 309. De plus, l'hélice en saillie 308 et la deuxième hélice en creux 309 sont de même sens.The protruding helix 308 and the second recessed helix 309 are of complementary shapes so that the protruding helix 308 is adapted to be screwed into the second hollow helix 309. In addition, the projecting helix 308 and the second hollow propeller 309 are of the same direction.

La première largeur U308 est comprise entre 10% et 50% de la deuxième largeur U309. Plus précisément, la deuxième largeur U309 est supérieure à la première largeur U308 de sorte que la deuxième largeur U309 est supérieure à la somme de la première largeur U308 et d'une course longitudinale en translation de l'aiguille 303. La course longitudinale en translation de l'aiguille 303 correspond à la distance parcourue par l'aiguille 303 suivant l'axe longitudinal Y4, entre la position de l'aiguille 303 lorsque la gâchette 6 du pistolet 1 est relâché et la position de l'aiguille 303 lorsque la gâchette 6 est complètement enclenchée.The first width U308 is between 10% and 50% of the second width U309. More specifically, the second width U309 is greater than the first width U308 so that the second width U309 is greater than the sum of the first width U308 and a longitudinal displacement in translation of the needle 303. The longitudinal displacement in translation of the needle 303 corresponds to the distance traveled by the needle 303 along the longitudinal axis Y4, between the position of the needle 303 when the trigger 6 of the pistol 1 is released and the position of the needle 303 when the trigger 6 is fully engaged.

En variante, les premiers et deuxièmes usinages forment des parties en creux de formes quelconques.Alternatively, the first and second machining form recessed portions of any shape.

Selon une autre variante, dans le deuxième mode de réalisation, l'aiguille 203 comprend un seul premier usinage formant la première hélice en creux.According to another variant, in the second embodiment, the needle 203 comprises a single first machining forming the first hollow propeller.

Selon une autre variante, dans le troisième mode de réalisation, l'aiguille 303 comprend un seul premier relief formant une hélice en saillie.According to another variant, in the third embodiment, the needle 303 comprises a single first relief forming a protruding helix.

Selon une autre variante, les usinages ne sont pas ménagés régulièrement le long de la partie centrale 3b de l'aiguille 3 et du logement 4.According to another variant, the machining is not arranged regularly along the central portion 3b of the needle 3 and the housing 4.

Selon une autre variante, le générateur 10 est alimenté en courant à partir d'une source autonome.According to another variant, the generator 10 is supplied with current from an autonomous source.

Selon une autre variante, dans le deuxième et le troisième mode de réalisation, le logement 4 comprend un seul deuxième usinage formant la deuxième hélice en creux.According to another variant, in the second and the third embodiment, the housing 4 comprises a single second machining forming the second hollow propeller.

Selon une autre variante, l'hélice en saillie 308 et la deuxième hélice en creux 309 du troisième mode de réalisation sont de sens inverses.According to another variant, the projecting helix 308 and the second recessed helix 309 of the third embodiment are of opposite directions.

Selon une autre variante, l'aiguille et son logement sont de forme complémentaire mais pas de forme cylindrique.According to another variant, the needle and its housing are of complementary shape but not of cylindrical shape.

Selon encore une autre variante, les parties en creux sont formées par des éléments en saillie de l'aiguille 3 et des logements 4. Dans ce cas, ces éléments sont, soit monobloc avec l'aiguille 3 ou le logement 4, soit des pièces rapportées sur l'aiguille 3 ou le logement 4.According to another variant, the hollow parts are formed by projecting elements of the needle 3 and the housing 4. In this case, these elements are either integral with the needle 3 or the housing 4, or parts reported on the needle 3 or the housing 4.

Sur la figure 1, le pistolet 1 représenté est un pulvérisateur manuel de projection électrostatique de produit de revêtement. En variante, ce pistolet est un pulvérisateur automatique de pulvérisation de produit de revêtement.On the figure 1 , gun 1 shown is a manual electrostatic spray coating product sprayer. Alternatively, this gun is an automatic coating product sprayer.

Les caractéristiques techniques du mode de réalisation et des variantes envisagées ci-dessus peuvent être combinées entre elles pour générer d'autres modes de réalisation.The technical features of the embodiment and variants contemplated above may be combined with one another to generate other embodiments.

Claims (13)

  1. A spray nozzle (1) for electrostatically spraying a coating product comprising:
    - a needle (3, 203, 303) forming a moving shutter of a valve (63) for controlling the spraying of the coating product and positioned in a recess (4) of a barrel (13) of the spray nozzle, the recess (4) defining a guiding surface (S4) for guiding the axial translation of the needle (3, 203, 303) along a longitudinal axis (Y4) of the recess, the needle (3, 203, 303) comprising a front end (3a) having a shape suitable for abutting against a seat (33) in order to obstruct a duct (2) for the flow of the coating product, a rear portion (3c) which interacts with means (6) for controlling the translation of the needle (3, 203, 303), and a central portion (3b) comprised between the front end (3a) and the rear portion (3c),
    - a high-voltage unit (12) capable of applying a high voltage to the front end (3a) of the needle (3),
    characterized in that at least one first raised portion (8; 208; 308) is provided on the central portion (3b; 203b; 303b) of the needle, inside the recess (4), the first raised portion being capable of increasing the electric creepage distance along the central portion (3b).
  2. The spray nozzle according to claim 1, characterized in that several first raised portions (8; 208) are arranged on the central portion (3b; 203b) of the needle (3; 203) and in that the first raised portions (8; 208) form hollow portions relative to an envelope surface (S3b; S203b) of the central portion (3b; 203b) of the needle (3, 203).
  3. The spray nozzle according to one of the preceding claims, characterized in that the first raised portion(s) (208) form a first hollow spiral (208) relative to the envelope surface (S203b) of the central portion (203b) of the needle (203).
  4. The spray nozzle according to claim 1, characterized in that the central portion (303b) comprises a globally cylindrical portion (314) and the first raised portion(s) (308) form a protruding spiral (308) protruding from the cylindrical portion (314).
  5. The spray nozzle according to one of the preceding claims, characterized in that at least one second raised portion (9; 309) is arranged in the recess (4) and faces the first raised portion(s) (8; 208; 308).
  6. The spray nozzle according to claim 5, characterized in that several second raised portions (9; 309) are arranged in the recess (4), and in that the second raised portions (9; 309) form hollow portions relative to the guiding surface (S4) for guiding the needle (3; 203; 303).
  7. The spray nozzle according to one of claims 5 to 6, characterized in that the second raised portion(s) (309) form a second hollow spiral (309) relative to the guiding surface (S4) for guiding the needle (303).
  8. The spray nozzle according to claims 4 and 7, characterized in that the protruding spiral (308) and the second hollow spiral (309) are in the same direction, in that the protruding spiral has a globally constant first width (U308), measured along the longitudinal axis (Y4), in that the second hollow spiral has a globally constant second width (U309), measured along the longitudinal axis (Y4), and in that the first width (U308) is comprised between 10% and 50% of the second width (U309).
  9. The spray nozzle according to claims 4 and 7, characterized in that the protruding spiral (308) and the second hollow spiral (309) are in opposite directions.
  10. The spray nozzle according to claim 1 or 2, characterized in that the first raised portion(s) form portions (8) with a reduced diameter (D8) relative to the diameter (D3) of the envelope surface (S3b) of the central portion (3b) of the needle (3), in that the diameter (D8) of the first raised portions is comprised between 15% and 60% of the diameter (D3) of the envelope surface of the needle (3), and in that the sum of the lengths (U8), measured parallel to the longitudinal axis (Y4), over which each first raised portion (8) extends is comprised between 10% and 50% of the length (U3b), measured parallel to the longitudinal axis (Y4), of the central portion (3b) of the needle (3).
  11. The spray nozzle according to claim 5 or 6 and according to claim 10, characterized in that the second raised portions form machined portions (9) whereof the diameter (D9) is comprised between 101% and 200% of the diameter of the guiding surface (S4) for guiding the needle (3), and in that the length (U9), measured parallel to the longitudinal axis (Y4), over which each second raised portion (9) extends, is comprised between 120% and 200% of the length (U8) over which each first raised portion (8) extends.
  12. The spray nozzle according to one of the preceding claims, characterized in that a volume (V1) left free by the first (8; 208; 308) and second (9; 309) raised portions between the needle (3; 203; 303) and its recess (4) is filled with an electrically insulating product.
  13. A facility (100) for spraying a coating product comprising a power source (10), a reservoir (20) of coating product and at least one spray nozzle (1) for electrostatic spraying of a coating product, characterized in that the spray nozzle is according to one of the preceding claims.
EP14738474.7A 2013-07-09 2014-07-08 Spray nozzle for electrostatic spraying of a coating product and facility for spraying Active EP3019278B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14738474T PL3019278T3 (en) 2013-07-09 2014-07-08 Spray nozzle for electrostatic spraying of a coating product and facility for spraying

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1356727A FR3008328B1 (en) 2013-07-09 2013-07-09 ELECTROSTATIC COATING PRODUCT SPRAY SPRAYER AND COATING PRODUCT PROJECTION INSTALLATION COMPRISING SUCH A SPRAYER
PCT/EP2014/064554 WO2015004111A1 (en) 2013-07-09 2014-07-08 Spray nozzle for electrostatic spraying of a coating product and facility for spraying a coating product including such a spray nozzle

Publications (2)

Publication Number Publication Date
EP3019278A1 EP3019278A1 (en) 2016-05-18
EP3019278B1 true EP3019278B1 (en) 2019-10-30

Family

ID=49212925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14738474.7A Active EP3019278B1 (en) 2013-07-09 2014-07-08 Spray nozzle for electrostatic spraying of a coating product and facility for spraying

Country Status (12)

Country Link
US (1) US10549291B2 (en)
EP (1) EP3019278B1 (en)
JP (1) JP6411488B2 (en)
KR (1) KR102181164B1 (en)
CN (1) CN105377442B (en)
BR (1) BR112015032228A2 (en)
ES (1) ES2759866T3 (en)
FR (1) FR3008328B1 (en)
PL (1) PL3019278T3 (en)
PT (1) PT3019278T (en)
RU (1) RU2662503C2 (en)
WO (1) WO2015004111A1 (en)

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Also Published As

Publication number Publication date
BR112015032228A2 (en) 2017-07-25
EP3019278A1 (en) 2016-05-18
WO2015004111A1 (en) 2015-01-15
CN105377442B (en) 2018-04-20
PT3019278T (en) 2020-01-14
US10549291B2 (en) 2020-02-04
PL3019278T3 (en) 2020-05-18
KR20160030118A (en) 2016-03-16
US20160368007A1 (en) 2016-12-22
RU2662503C2 (en) 2018-07-26
FR3008328B1 (en) 2015-07-24
RU2016104058A3 (en) 2018-03-29
RU2016104058A (en) 2017-08-14
JP6411488B2 (en) 2018-10-24
FR3008328A1 (en) 2015-01-16
JP2016523706A (en) 2016-08-12
CN105377442A (en) 2016-03-02
KR102181164B1 (en) 2020-11-20
ES2759866T3 (en) 2020-05-12

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