EP0553052A1 - Gun for electrostatic spraying of powders of different colours and characteristics - Google Patents
Gun for electrostatic spraying of powders of different colours and characteristics Download PDFInfo
- Publication number
- EP0553052A1 EP0553052A1 EP93500006A EP93500006A EP0553052A1 EP 0553052 A1 EP0553052 A1 EP 0553052A1 EP 93500006 A EP93500006 A EP 93500006A EP 93500006 A EP93500006 A EP 93500006A EP 0553052 A1 EP0553052 A1 EP 0553052A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gun
- nozzle
- rod
- conduit
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000843 powder Substances 0.000 title claims description 13
- 238000007590 electrostatic spraying Methods 0.000 title claims description 5
- 239000003086 colorant Substances 0.000 title claims description 4
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 9
- 239000012777 electrically insulating material Substances 0.000 claims abstract description 3
- 230000005686 electrostatic field Effects 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims 1
- 239000006185 dispersion Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 239000012254 powdered material Substances 0.000 claims 1
- 239000003973 paint Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 239000000049 pigment Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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
- B05B5/053—Arrangements for supplying power, e.g. charging power
- B05B5/0531—Power generators
-
- 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
- B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
- B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
Definitions
- the present invention relates to a gun for electrostatic spraying of powder materials, in particular powder paint of various colors and characteristics, including metallic pigment paint powder for metallic paint applications.
- the proposed spray gun has been designed to simplify the tasks of color change as much as possible, by replacing, essentially, a single piece, which consists of a nozzle, at low cost, quick and very simple assembly and disassembly, associated with body of the gun barrel, having the particularity that this nozzle has a lateral opening for the arrangement, by means of a coupling piece or connection of the supply pipe of the powder-air mixture, which, thus penetrates directly to inside this nozzle and is electrostatically charged outside its axial passage duct.
- the inlet and conduction pipe of the air-powder mixture extends through the body of the spray gun, as can be seen in European patent EP 110 753, property of the depositor, which involves manufacturing the body of the complex pistol, because it is necessary to construct, inside, said duct for circulation of the powder-air stream.
- the powder-air mixture when it passes through the body thereof, also circulates near the high voltage generator block, formed, conventionally, by a transformer and an oscillator associated with a voltage multiplier circuit, with which, if the powder contains metallic pigments, this proximity alters the conditions of electrostatic charge of this current of powder-air.
- Patent EP 164 837 which relates to an electrostatic spray gun, proposes an exchangeable barrel section, very complex and even, at its terminal section, near the spraying area, two sockets and differentiated conduits for the supply and circulation of pressurized air and fluidized powder paint also by pressurized air, respectively.
- Said terminal portion is, moreover, very bulky with a larger section than the rest of the barrel, which makes its use difficult in the case where it must be inserted in recesses or tubular bodies.
- the object of the invention is the construction of a gun which can be applied to powder coating materials of various colors and characteristics, including conductive pigments (metallic paint), having the particularity, in addition to fulfilling conditions of simplicity aiding in the change of color, or, in the case of wear of the spraying section, of ensuring complete separation from the transport and circulation section of the powder-air mixture to the spraying and electrostatic charge zone, with respect to the source of generation of said electrostatic charge.
- conductive pigments metallic paint
- Said high voltage generator block placed in the body of the gun and advantageously formed by several independent modules (see EP 110 753, cited) comprises in combination an oscillator and a transformer which convert a direct current of low voltage, supplied to the gun through a low voltage conductor cable, at a high frequency intermediate voltage, and a voltage multiplier circuit which, in turn, transforms said high frequency current into a high voltage direct current for application to one or more field generator electrodes electrostatic.
- the assembly proposes for this purpose the use of spray nozzles which can be replaced, very simple, easy to clean and of low cost, and therefore, easy to replace after a certain time of using them, or in the case of a color change (by providing, alternatively for cleaning, a nozzle for each color, for example), comprising a tubular body provided with a flange which abuts at the front end of the main body of the pistol and provided with a wick which extends it axially behind, and which fits, (or alternatively is screwed), into a housing of said pistol body, at the bottom of which there are means for the electrical connection to the high voltage source to generate the electrostatic field.
- the tubular body of the nozzle has a first conduit of large passage and uniform section, which largely surrounds a fixed central rod, deflector holder and finished in a frustoconical flare.
- a tubular section such as a screw connection, acting as connector for connection of the end of a flexible pipe for circulation of the powder-air mixture to be sprayed which in this way has direct access to a zone remote from the electrostatic charge generation block, and having free passage through this first, wide conduit, which is favored by the inclination of said lateral opening, the air-powder stream opening, at the end portion thereof, abutting against the deflector.
- An electrode for electrostatic charge extends through the center of the rod completely electrically insulated, or along the walls of the tubular body, also made of electrically insulating material, according to two possible embodiments of the object of the invention, and emerges outside the first nozzle duct in the electrostatic spraying area.
- the first conduit extends into a second axial conduit to said wick, with reduced passage, through which and adjusted under pressure is inserted the rear section of said insulating rod finished in a deflector body, also electrically insulating, which is arranged in front of the free end, distal of said wick of the tubular body, with the possibility of axial movement relative to the rod, to thus vary the amplitude of the spray field, by controlling the concentration of the electrostatic field produced by the electrode which is arranged near this zone, outside the body of the nozzle.
- Said nozzle is fixed to the main body of the gun, in a possible implementation, by means of a nut member which is screwed, in a threaded section existing at the front end of said gun body.
- the second duct of the tubular body has a tubular sheath or cover, or a covering of its internal walls acting as a seal, when it is crossed with the deflector holder rod.
- the nozzle explained will be subdivided into two half-pieces that can be coupled by screwing them, one carrying the first duct with its lateral opening and the second , comprising the drill bit for the connection to the body of the gun with a blind axial hole or right through, for fixing the end of the deflector holder rod.
- Figure 1 is a side elevational view, with partial cross section of a gun, constructed according to the invention, and which includes as a characteristic part a nozzle which is illustrated in its mounting situation on the gun, and externally thereto ci, in two alternative implementations in FIGS. 1a and 1b, as well as coupling parts or fittings which couple to this nozzle, for connection of a pipe carrying the powder-air mixture.
- Figure 2 is a sectional view of a possible implementation of the object of the invention, in which the high voltage generator block is formed by several sub-modules, inserted in an axial housing in the barrel of the barrel of the gun, such as described in the Spanish utility model No. 264765 cited.
- Figure 3 illustrates an elevational view with partial section of the front section of the gun, with an alternative attachment of the deflector holder rod to the body of the nozzle.
- Figure 4 shows an elevational view of the gun, which includes a portion of the powder-air mixture supply pipe, connected to the body of the nozzle by a connection fitting, as described.
- Figure 5 is a side elevational view, with partial cross section of a gun, constructed according to a variant of the invention with a hollow rod and a duct for the supply of air to its interior
- the gun comprises a main body -30- made of electro-insulating material, which internally houses a set of elements linked together to generate the electrostatic field, supplied by a low voltage cable.
- -31- i.e. a low to high voltage transformer -12-, associated with an oscillator (included or not inside the handle -37-), the output of this transformer -12- remaining connected to a high voltage multiplier --10-, -11-.
- this transformer -12- forms a first module -32-, and the voltage multiplier a second module -19- mounted axially inside a tubular housing -18- of the gun body, of insulating material, so they can be replaced separately, and are delimited by a closure cover -25-, in accordance with the construction of the example of the cited utility model No. 264,765.
- a cover -13- further allows access to the transformer -12-.
- the multiplier -10-, - 11- is connected through a conductive cable -33- to a contact socket -8- (Fig.1), -20- (Fig.2), hence an electrode -1 -, -34- will take high-voltage current, said electrode being installed on the nozzle -4-via a conductor -1a- (Fig 1) axial to a rod -2- carrying a deflector -3- , both electrically insulating, or else via a conductor -23- (Fig 2) which extends through the walls of the nozzle -22-.
- the invention proposes, in essence (see Figures 1a and 1b), a nozzle -4- (Fig 1), -22- (Fig.2), -50- (Fig.3) extremely simple, having a first conduit -41-, a second conduit -42- for fixing or passing the rod -2- carrying the deflector, the first conduit -41- having a lateral opening -43- for the connection of a coupling part, such as a connector, -14a-, -14b-, for connecting a flexible hose -35- for the circulation of the powder-air mixture, which arrives at said nozzle -4-, -22- - 50-, at a point distant from the high voltage current generation source, for the formation of the electrostatic field.
- a coupling part such as a connector, -14a-, -14b-
- the rod -2- in the implementation illustrated in Figure 1 is arranged through the conduit -42-, adjusted and, preferably, with the interposition of a seal -6- sealing-fixing and present at its distal end portion of the deflector, a threaded section -7-, conductive, forming a contact which is screwed and remains opposite, end-to-end, a second contact -8- which remains connected to the conductor - 33- which connects to the high voltage multiplier -10-, -11-.
- FIG. 3 there is illustrated on a larger scale an alternative implementation of a nozzle -50- which can be replaced, as proposed by the invention, in which the rod -52- carrying, at its free end, the deflector -3- remains fixed by its internal end in a blind perforation -53- from the bottom of the second axial duct to the body of the nozzle; we observe the coupling part or fitting -54- connected to the lateral opening, the electrodes -51- which are connected, through the conductor -56- to contacts -59- opposite a conductive ring - 55-.
- the section of the wick (44) for coupling to the body of the gun -30- comprises a threaded portion -57- which couples by screwing it into the housing -58- before the body of the gun -30- , also internally threaded inside.
- the part -49- coaxial with the nozzle, having an internal thread -60-, is screwed on the front section of the body of the gun and retains a flange -61- of the body of the nozzle serving as a stop.
- the parts -5-, -49- could be a simple socket coaxially coupled, the section -48- screwed from its rear wick -44- of coupling making l 'office connecting the nozzle to the gun body.
- the design of the cited nozzle is extremely simple and inexpensive, and its assembly or replacement involves only the manipulation of the nut -5- -49-, (or possibly unscrew the nozzle -22-, -50) and we can therefore use a nozzle for each color or replace it in the case of wear after a certain time of use.
- the nozzle is made according to the example of FIG. 1b, that is to say by means of two half-pieces -4a- and -4b- which can be coupled by screwing them, the only part to be replaced, for the replacement or cleaning, will be that before -4a- constituted by a simple hose with an inclined lateral opening -43-, greatly simplifying the maintenance costs of the gun.
- the pistol incorporates a rod -36- to fix a part of the body of the pipe -35-, near the base of the handle -37- of the pistol.
- the wick -44- at the rear of the nozzle body -22- which couples to the gun body includes, as in Figure 3, a threaded section -21- which is screwed in a front recess of the gun body where the connectors -26- are defined for the connection of the electrodes -34-.
- FIG. 5 shows an alternative embodiment of the gun according to the invention which comprises an independent duct -39- for supplying pressurized air, which passes through the body of the gun -30- and is connected end to end through a electrical contact element -8- with the rear end of a hollow rod -29-, support for a deflector (3), with an electrode (1) axial to the central conduit - 39- opening into the extreme zone of the rod -29- beyond the deflector cone -3-.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
La présente invention concerne un pistolet pour pulvérisation électrostatique de matériaux en poudre, notamment de la peinture en poudre de diverses couleurs et caractéristiques, y compris de la poudre de peinture à pigments métalliques pour applications de peinture métallisée.The present invention relates to a gun for electrostatic spraying of powder materials, in particular powder paint of various colors and characteristics, including metallic pigment paint powder for metallic paint applications.
Le pistolet proposé a été conçu pour simplifier au maximum les tâches de changement de couleur, par le remplacement, essentiellement, d'une seule pièce, qui consiste en une tuyère, à faible coût, à montage et démontage rapides et très simples, associée au corps du canon du pistolet, ayant la particularité que cette tuyère comporte une ouverture latérale pour l'agencement, au moyen d'une pièce d'accouplement ou de raccordement du tuyau d'amenée du mélange poudre-air, qui, ainsi pénètre directement à l'intérieur de cette tuyère et est électrostatiquement chargée à l'extérieur de son conduit de passage axial.The proposed spray gun has been designed to simplify the tasks of color change as much as possible, by replacing, essentially, a single piece, which consists of a nozzle, at low cost, quick and very simple assembly and disassembly, associated with body of the gun barrel, having the particularity that this nozzle has a lateral opening for the arrangement, by means of a coupling piece or connection of the supply pipe of the powder-air mixture, which, thus penetrates directly to inside this nozzle and is electrostatically charged outside its axial passage duct.
Conventionnellement, dans les pistolets pour pulvérisation électrostatique de peinture en poudre, le tuyau d'entrée et de conduction du mélange air-poudre, s'étend à travers le corps du pistolet, tel que l'on peut voir dans le brevet européen EP 110 753, propriété du déposant, ce qui comporte une fabrication du corps du pistolet complexe, car il faut construire, à son intérieur, ledit conduit pour circulation du courant de poudre-air. Pour le reste, dans ce pistolet, et dans la plupart des pistolets connus, le mélange poudre-air, lorsqu'il passe à travers le corps de celui-ci, circule également à proximité du bloc générateur de haute tension, formé, conventionnellement, par un transformateur et un oscillateur associés à un circuit multiplicateur de tension, avec quoi, si la poudre contient des pigments métalliques, cette proximité altère les conditions de charge électrostatique de ce courant de poudre-air.Conventionally, in spray guns for electrostatic spraying of powder paint, the inlet and conduction pipe of the air-powder mixture extends through the body of the spray gun, as can be seen in European patent EP 110 753, property of the depositor, which involves manufacturing the body of the complex pistol, because it is necessary to construct, inside, said duct for circulation of the powder-air stream. For the rest, in this pistol, and in most of the known pistols, the powder-air mixture, when it passes through the body thereof, also circulates near the high voltage generator block, formed, conventionally, by a transformer and an oscillator associated with a voltage multiplier circuit, with which, if the powder contains metallic pigments, this proximity alters the conditions of electrostatic charge of this current of powder-air.
Le brevet EP 164 837, qui concerne un pistolet de pulvérisation électrostatique, propose une section de canon échangeable, très complexe et même, à sa section terminale, à proximité de la zone de pulvérisation, deux prises et des conduits différenciés pour l'amenée et la circulation de l'air sous pression et de peinture en poudre fluidifiée également par air sous pression, respectivement. Ladite portion terminale est, de plus, très volumineuse avec une plus grande section que le reste du canon, ce qui rend son emploi difficile dans le cas où elle doit être insérée dans des évidements ou des corps tubulaires.Patent EP 164 837, which relates to an electrostatic spray gun, proposes an exchangeable barrel section, very complex and even, at its terminal section, near the spraying area, two sockets and differentiated conduits for the supply and circulation of pressurized air and fluidized powder paint also by pressurized air, respectively. Said terminal portion is, moreover, very bulky with a larger section than the rest of the barrel, which makes its use difficult in the case where it must be inserted in recesses or tubular bodies.
L'objet de l'invention est la construction d'un pistolet qui peut être appliquée à des matériaux de revêtement en poudre de diverses couleurs et caractéristiques, y compris des pigments conducteurs (peinture métallisée), ayant la particularité, en plus de remplir des conditions de simplicité aidant au changement de couleur, ou, dans le cas d'usure de la section de pulvérisation, d'assurer une séparation complète de la section de transport et de circulation du mélange poudre-air jusqu'à la zone de pulvérisation et de charge électrostatique, par rapport à la source de génération de ladite charge électrostatique. Ledit bloc générateur de haute tension, placé dans le corps du pistolet et avantageusement formé par plusieurs modules indépendants (voir EP 110 753, cité) comprend en combinaison un oscillateur et un transformateur qui convertissent un courant continu de basse tension, fournit au pistolet à travers un câble conducteur de basse tension, à une tension intermédiaire de haute fréquence, et un circuit multiplicateur de tension qui, à son tour, transforme ledit courant de haute fréquence en un courant continu de haute tension pour application à un ou plusieurs électrodes générateurs de champ électrostatique.The object of the invention is the construction of a gun which can be applied to powder coating materials of various colors and characteristics, including conductive pigments (metallic paint), having the particularity, in addition to fulfilling conditions of simplicity aiding in the change of color, or, in the case of wear of the spraying section, of ensuring complete separation from the transport and circulation section of the powder-air mixture to the spraying and electrostatic charge zone, with respect to the source of generation of said electrostatic charge. Said high voltage generator block, placed in the body of the gun and advantageously formed by several independent modules (see EP 110 753, cited) comprises in combination an oscillator and a transformer which convert a direct current of low voltage, supplied to the gun through a low voltage conductor cable, at a high frequency intermediate voltage, and a voltage multiplier circuit which, in turn, transforms said high frequency current into a high voltage direct current for application to one or more field generator electrodes electrostatic.
L'ensemble, conformément à l'invention, propose à cette fin l'utilisation de tuyères de pulvérisation pouvant être rechangées, très simples, facile à nettoyer et de faible coût, et donc, faciles à remplacer après un certain temps de les utiliser, ou dans le cas de changement de couleur (en prévoyant, alternativement à son nettoyage, une tuyère pour chaque couleur, par exemple), comportant un corps tubulaire muni d'une collerette qui fait butée à l'extrémité avant du corps principal du pistolet et muni d'une mèche qui le prolonge axialement en arrière, et qui s'emboîte, (ou alternativement est vissée), dans un logement dudit corps du pistolet, au fond duquel existent des moyens pour le branchement électrique à la source de haute tension pour générer le champ électrostatique. Le corps tubulaire de la tuyère présente un premier conduit de vaste passage et à section uniforme, qui entoure largement une tige centrale fixe, porte-déflecteur et fini en un évasement tronconique. Latéralement audit corps tubulaire de la tuyère, il existe une ouverture latérale inclinée qui communique avec ledit conduit principal, auquel est relié un tronçon tubulaire tel qu'un raccord vissé, faisant office de connecteur de raccordement de l'extrémité d'un tuyau souple pour la circulation du mélange de poudre-air à pulvériser qui de cette façon a directement accès à une zone éloignée du bloc de génération de charge électrostatique, et ayant le passage libre à travers ce premier conduit, large, qui est favorisé par l'inclinaison de ladite ouverture latérale, le courant d'air-poudre s'ouvrant, à la portion d'extrémité de celui-ci, en butant contre le déflecteur. Un électrode pour charge électrostatique, s'étend à travers le centre de la tige complètement isolé électriquement, ou le long des parois du corps tubulaire, également en matériau isolant électrique, selon deux réalisations possibles de l'objet de l'invention, et émerge à l'extérieur du premier conduit de la tuyère dans la zone de pulvérisation électrostatique. Ainsi, il est évité que dans le cas où l'on employerait des pigments conducteurs il se produise une décharge à masse du champ électrostatique à travers le courant d'air-poudre circulant à proximité ou en contact avec les électrodes de charge. Dans une réalisation possible de l'invention, le premier conduit se prolonge en un deuxième conduit axial à ladite mèche, à passage réduit, à travers lequel et ajustée sous pression est insérée la section arrière de ladite tige isolante finie en un corps déflecteur, également électro-isolant, qui est aménagé devant l'extrémité libre, distale de ladite mèche du corps tubulaire, avec possibilité de mouvement axial par rapport à la tige, pour varier ainsi l'amplitude du champ de pulvérisation, en contrôlant la concentration du champ électrostatique produit par l'électrode qui est aménagé à proximité de cette zone, extérieure au corps de la tuyère. Ladite tuyère est fixée au corps principal du pistolet, dans une mise en oeuvre possible, par l'intermédiaire d'un membre d'écrou qui se visse, dans une section filetée existant à l'extrémité avant dudit corps de pistolet.The assembly, in accordance with the invention, proposes for this purpose the use of spray nozzles which can be replaced, very simple, easy to clean and of low cost, and therefore, easy to replace after a certain time of using them, or in the case of a color change (by providing, alternatively for cleaning, a nozzle for each color, for example), comprising a tubular body provided with a flange which abuts at the front end of the main body of the pistol and provided with a wick which extends it axially behind, and which fits, (or alternatively is screwed), into a housing of said pistol body, at the bottom of which there are means for the electrical connection to the high voltage source to generate the electrostatic field. The tubular body of the nozzle has a first conduit of large passage and uniform section, which largely surrounds a fixed central rod, deflector holder and finished in a frustoconical flare. Laterally to said tubular body of the nozzle, there is an inclined lateral opening which communicates with said main duct, to which is connected a tubular section such as a screw connection, acting as connector for connection of the end of a flexible pipe for circulation of the powder-air mixture to be sprayed which in this way has direct access to a zone remote from the electrostatic charge generation block, and having free passage through this first, wide conduit, which is favored by the inclination of said lateral opening, the air-powder stream opening, at the end portion thereof, abutting against the deflector. An electrode for electrostatic charge, extends through the center of the rod completely electrically insulated, or along the walls of the tubular body, also made of electrically insulating material, according to two possible embodiments of the object of the invention, and emerges outside the first nozzle duct in the electrostatic spraying area. Thus, it is avoided that in the case where conductive pigments are used, there occurs a mass discharge of the electrostatic field through the air-powder current circulating near or in contact with the charging electrodes. In a possible embodiment of the invention, the first conduit extends into a second axial conduit to said wick, with reduced passage, through which and adjusted under pressure is inserted the rear section of said insulating rod finished in a deflector body, also electrically insulating, which is arranged in front of the free end, distal of said wick of the tubular body, with the possibility of axial movement relative to the rod, to thus vary the amplitude of the spray field, by controlling the concentration of the electrostatic field produced by the electrode which is arranged near this zone, outside the body of the nozzle. Said nozzle is fixed to the main body of the gun, in a possible implementation, by means of a nut member which is screwed, in a threaded section existing at the front end of said gun body.
Dans une mise en oeuvre de l'invention qui sera montrée dans des exemples, le deuxième conduit du corps tubulaire présente une gaine ou housse tubulaire, ou un revêtement de ses parois intérieures faisant office de joint d'étanchéité, lorsqu'on le traverse avec la tige porte-déflecteur.In an implementation of the invention which will be shown in examples, the second duct of the tubular body has a tubular sheath or cover, or a covering of its internal walls acting as a seal, when it is crossed with the deflector holder rod.
Cette mise en oeuvre implique que, même si on utilise des matériaux en poudre très agressifs, par exemple avec des particules en verre, qui avec l'usage ont tendance à détériorer le conduit à travers lequel elles circulent, dans le cas présent, il suffira de remplacer la tuyère, car il s'agit d'une pièce à très faible coût, spécialement si l'électrode est agencé à travers 'le corps de la tige portant le déflecteur, qui pourra être réutilisé dans la nouvelle tuyère.This implementation implies that, even if very aggressive powder materials are used, for example with glass particles, which with use tend to deteriorate the conduit through which they circulate, in this case, it will be enough to replace the nozzle, because it is a very inexpensive part, especially if the electrode is arranged through the body of the rod carrying the deflector, which can be reused in the new nozzle.
Pour que le nettoyage soit encore plus simple et facile, ou bien rendre le rechange possible, la tuyère expliquée se fera sous-divisée en deux demi-pièces accouplables en les vissant, l'une portant le premier conduit avec son ouverture latérale et la deuxième, comportant la mèche pour la liaison au corps du pistolet avec un orifice axial aveugle ou de part en part, pour la fixation de l'extrémité de la tige porte-déflecteur.To make cleaning even simpler and easier, or to make replacement possible, the nozzle explained will be subdivided into two half-pieces that can be coupled by screwing them, one carrying the first duct with its lateral opening and the second , comprising the drill bit for the connection to the body of the gun with a blind axial hole or right through, for fixing the end of the deflector holder rod.
Un pistolet pour pulvérisation électrostatique selon l'invention sera décrit à la suite, au titre d'exemple et se rapportant à des feuilles de dessins.An electrostatic spray gun according to the invention will be described below, by way of example and referring to sheets of drawings.
La figure 1 est une vue en élévation latérale, avec section transversale partielle d'un pistolet, construit selon l'invention, et qui inclut comme partie caractéristique une tuyère qui est illustrée dans sa situation de montage sur le pistolet, et extérieurement à celui-ci, dans deux mises en oeuvre alternatives dans les figures 1a et 1b, ainsi que des pièces d'accouplement ou raccords qui s'accouplent à cette tuyère, pour raccordement d'un tuyau portant le mélange poudre-air.Figure 1 is a side elevational view, with partial cross section of a gun, constructed according to the invention, and which includes as a characteristic part a nozzle which is illustrated in its mounting situation on the gun, and externally thereto ci, in two alternative implementations in FIGS. 1a and 1b, as well as coupling parts or fittings which couple to this nozzle, for connection of a pipe carrying the powder-air mixture.
La figure 2 est une vue en coupe d'une mise en oeuvre possible de l'objet de l'invention, dans laquelle le bloc générateur de haute tension est formé par plusieurs sous-modules, insérés dans un logement axial au corps du canon du pistolet, tel comme il est décrit dans le modèle d'utilité espagnol cité nº 264.765.Figure 2 is a sectional view of a possible implementation of the object of the invention, in which the high voltage generator block is formed by several sub-modules, inserted in an axial housing in the barrel of the barrel of the gun, such as described in the Spanish utility model No. 264765 cited.
La figure 3 illustre une vue en élévation avec coupe partielle de la section avant du pistolet, avec une fixation alternative de la tige porte-déflecteur au corps de la tuyère.Figure 3 illustrates an elevational view with partial section of the front section of the gun, with an alternative attachment of the deflector holder rod to the body of the nozzle.
La figure 4 montre une vue en élévation du pistolet, qui inclut une portion du tuyau d'amenée du mélange poudre-air, relié au corps de la tuyère par un raccord de branchement, conformément à ce qui est décrit.Figure 4 shows an elevational view of the gun, which includes a portion of the powder-air mixture supply pipe, connected to the body of the nozzle by a connection fitting, as described.
La figure 5 est une vue en élévation latérale, avec section transversale partielle d'un pistolet, construit selon une variante de l'invention avec une tige creuse et un conduit pour l'alimentation de l'air a son intérieurFigure 5 is a side elevational view, with partial cross section of a gun, constructed according to a variant of the invention with a hollow rod and a duct for the supply of air to its interior
Comme on peut voir sur la figure 1, le pistolet comprend un corps principal -30- en matériau électro - isolant, qui héberge intérieurement un ensemble d'éléments reliés entre eux pour générer le champ électrostatique, alimentés par un câble à basse tension -31-, c'est-à-dire un transformateur de basse à haute tension -12-, associé à un oscillateur (inclus ou non à l'intérieur de la poignée -37-), la sortie de ce transformateur -12- restant branchée à un multiplicateur de haute tension --10-, -11-. Tel que montre la figure 2, ce transformateur -12- forme un premier module -32-, et le multiplicateur de tension un deuxième module -19- montés axialement à l'intérieur d'un logement tubulaire -18- du corps du pistolet, en matériau isolant, de sorte qu'ils peuvent être remplacés séparément, et restent délimités par un couvercle de fermeture -25-, conformément à la construction de l'exemple du modèle d'utilité cité nº 264.765. Sur la figure 1, un couvercle -13- permet en outre l'accès au transformateur -12-. Le multiplicateur -10-, - 11-, est branché à travers un câble conducteur -33- à une douille de contact -8- (Fig.1), -20- (Fig.2), d'où un électrode -1-, -34- prendra le courant à haute tension, ledit électrode étant installé sur la tuyère -4-par l'intermédiaire d'un conducteur -1a- (Fig 1) axiale à une tige -2- portant un déflecteur -3-, tous deux électro-isolants, ou bien par l'intermédiaire d'un conducteur -23- (Fig 2) qui s'étend à travers les parois de la tuyère -22-. L'invention propose, en essence, (voir figures 1a et 1b), une tuyère -4- (Fig 1), -22- (Fig.2), -50- (Fig.3) extrêmement simple, ayant un premier conduit -41-, un deuxième conduit -42- pour la fixation ou le passage de la tige -2- portant le déflecteur, le premier conduit -41- possédant une ouverture latérale -43- pour la liaison d'une pièce d'accouplement, tel qu'un raccord, -14a-, -14b-, de raccordement d'un tuyau souple -35- pour la circulation du mélange poudre-air, qui arrive à ladite tuyère -4-, -22- - 50-, à un point éloigné de la source de génération de courant à haute tension, pour là formation du champ électrostatique. La tige -2- dans la mise en oeuvre illustrée sur la figure 1, est agencée à travers le conduit -42-, ajustée et, de préférence, avec l'interposition d'un joint -6- d'étanchéité-fixation et présente à sa portion d'extrémité distale du déflecteur, une section filetée -7-, conductrice, formant un contact qui se visse et reste en face, bout-à-bout, d'un deuxième contact -8- qui reste branché au conducteur -33- qui relie au multiplicateur de haute tension -10-, -11-.As can be seen in FIG. 1, the gun comprises a main body -30- made of electro-insulating material, which internally houses a set of elements linked together to generate the electrostatic field, supplied by a low voltage cable. -31-, i.e. a low to high voltage transformer -12-, associated with an oscillator (included or not inside the handle -37-), the output of this transformer -12- remaining connected to a high voltage multiplier --10-, -11-. As shown in FIG. 2, this transformer -12- forms a first module -32-, and the voltage multiplier a second module -19- mounted axially inside a tubular housing -18- of the gun body, of insulating material, so they can be replaced separately, and are delimited by a closure cover -25-, in accordance with the construction of the example of the cited utility model No. 264,765. In Figure 1, a cover -13- further allows access to the transformer -12-. The multiplier -10-, - 11-, is connected through a conductive cable -33- to a contact socket -8- (Fig.1), -20- (Fig.2), hence an electrode -1 -, -34- will take high-voltage current, said electrode being installed on the nozzle -4-via a conductor -1a- (Fig 1) axial to a rod -2- carrying a deflector -3- , both electrically insulating, or else via a conductor -23- (Fig 2) which extends through the walls of the nozzle -22-. The invention proposes, in essence (see Figures 1a and 1b), a nozzle -4- (Fig 1), -22- (Fig.2), -50- (Fig.3) extremely simple, having a first conduit -41-, a second conduit -42- for fixing or passing the rod -2- carrying the deflector, the first conduit -41- having a lateral opening -43- for the connection of a coupling part, such as a connector, -14a-, -14b-, for connecting a flexible hose -35- for the circulation of the powder-air mixture, which arrives at said nozzle -4-, -22- - 50-, at a point distant from the high voltage current generation source, for the formation of the electrostatic field. The rod -2- in the implementation illustrated in Figure 1, is arranged through the conduit -42-, adjusted and, preferably, with the interposition of a seal -6- sealing-fixing and present at its distal end portion of the deflector, a threaded section -7-, conductive, forming a contact which is screwed and remains opposite, end-to-end, a second contact -8- which remains connected to the conductor - 33- which connects to the high voltage multiplier -10-, -11-.
Sur la figure 3, il est illustré à une plus grande échelle une mise en oeuvre alternative d'une tuyère -50- qui peut être rechangée, comme propose l'invention, dans laquelle la tige -52- portant, à son extrémité libre, le déflecteur -3-, reste fixée par son extrémité interne dans une perforation aveugle -53- du fond du second conduit axial au corps de la tuyère; on y observe la pièce d'accouplement ou raccord -54- relié à l'ouverture latérale, les électrodes -51- qui sont reliés, à travers le conducteur -56- à des contacts -59- en face d'un anneau conducteur -55-. Dans cette réalisation, la section de la mèche (44) d'accouplement au corps du pistolet -30- comprend une portion filetée -57- qui s'accouple en la vissant dans le logement -58- avant du corps du pistolet -30-, également fileté à son intérieur de façon conjuguée. La pièce -49- coaxiale à la tuyère, ayant un filetage interne -60-, se visse sur la section avant du corps du pistolet et retient une collerette -61- du corps de la tuyère servant de butée. Dans cette réalisation, comme c'est le cas de la figure 2, les pièces -5-, -49- pourraient être une simple douille coaxialement accouplée, la section -48- vissée de sa mèche arrière -44- d'accouplement faisant l'office de liaison de la tuyère au corps du pistolet.In FIG. 3, there is illustrated on a larger scale an alternative implementation of a nozzle -50- which can be replaced, as proposed by the invention, in which the rod -52- carrying, at its free end, the deflector -3- remains fixed by its internal end in a blind perforation -53- from the bottom of the second axial duct to the body of the nozzle; we observe the coupling part or fitting -54- connected to the lateral opening, the electrodes -51- which are connected, through the conductor -56- to contacts -59- opposite a conductive ring - 55-. In this embodiment, the section of the wick (44) for coupling to the body of the gun -30- comprises a threaded portion -57- which couples by screwing it into the housing -58- before the body of the gun -30- , also internally threaded inside. The part -49- coaxial with the nozzle, having an internal thread -60-, is screwed on the front section of the body of the gun and retains a flange -61- of the body of the nozzle serving as a stop. In this embodiment, as is the case in FIG. 2, the parts -5-, -49- could be a simple socket coaxially coupled, the section -48- screwed from its rear wick -44- of coupling making l 'office connecting the nozzle to the gun body.
Comme on peut voir à la partie inférieure gauche de la figure 1, la conception de la tuyère citée est extrêmement simple et à faible coût, et son montage ou remplacement n'implique que la manipulation de l'écrou -5- -49-, (ou éventuellement dévisser la tuyère -22-, -50) et on peut donc employer une tuyère pour chaque couleur ou la remplacer dans le cas d'usure après un certain temps d'usage.As can be seen in the lower left-hand part of FIG. 1, the design of the cited nozzle is extremely simple and inexpensive, and its assembly or replacement involves only the manipulation of the nut -5- -49-, (or possibly unscrew the nozzle -22-, -50) and we can therefore use a nozzle for each color or replace it in the case of wear after a certain time of use.
Si la tuyère se fait selon l'exemple de la figure 1b, c'est-à-dire au moyen de deux demi-pièces -4a- et -4b- accouplables en les vissant, la seule pièce à remplacer, pour le rechange ou nettoyage, sera celle d'avant -4a- constituée par un simple tuyau avec une ouverture latérale inclinée -43-, en simplifiant énormément les coûts d'entretien du pistolet.If the nozzle is made according to the example of FIG. 1b, that is to say by means of two half-pieces -4a- and -4b- which can be coupled by screwing them, the only part to be replaced, for the replacement or cleaning, will be that before -4a- constituted by a simple hose with an inclined lateral opening -43-, greatly simplifying the maintenance costs of the gun.
Sur la figure 4, on observe que le pistolet incorpore une tige -36- pour fixer une partie du corps du tuyau -35-, près de la base de la poignée -37- du pistolet.In FIG. 4, it can be seen that the pistol incorporates a rod -36- to fix a part of the body of the pipe -35-, near the base of the handle -37- of the pistol.
On a indiqué également avec les références -15- la détente, -16- l'interrupteur d'actionnement, -17- un presse-étoupe, pour le câble d'alimentation -31-, et, (Fig 2), des connecteurs -24- d'alimentation à basse tension au transformateur -12-.Also indicated with the references -15- the trigger, -16- the actuation switch, -17- a cable gland, for the power cable -31-, and, (Fig 2), connectors -24- low voltage power supply to the transformer -12-.
Sur la figure 2, la mèche -44- à l'arrière du corps de la tuyère -22- qui s'accouple au corps du pistolet, comprend, de même que sur la figure 3, une section filetée -21- qui se visse dans un évidement avant du corps du pistolet où sont définis les connecteurs -26- pour le branchement des électrodes -34-.In Figure 2, the wick -44- at the rear of the nozzle body -22- which couples to the gun body, includes, as in Figure 3, a threaded section -21- which is screwed in a front recess of the gun body where the connectors -26- are defined for the connection of the electrodes -34-.
La figure 5 montre une réalisation alternative du pistolet selon l'invention lequel comporte un conduit -39- indépendant pour alimentation d'air sous pression, qui traverse le corps du pistolet -30- et se raccorde, bout à bout à travers d'un élément de contact électrique -8- avec l'extrémité arrière d'une tige -29- creuse, support d'un déflecteur (3), avec une électrode (1) axiale au conduit - 39- central débouchant dans la zone extrême de la tige -29- au delà du cône déflecteur -3-.FIG. 5 shows an alternative embodiment of the gun according to the invention which comprises an independent duct -39- for supplying pressurized air, which passes through the body of the gun -30- and is connected end to end through a electrical contact element -8- with the rear end of a hollow rod -29-, support for a deflector (3), with an electrode (1) axial to the central conduit - 39- opening into the extreme zone of the rod -29- beyond the deflector cone -3-.
L'objet de l'invention s'étend également aux variations de détail, qui n'altèrent pas son essentialité, résumée dans les revendications suivantes.The subject of the invention also extends to variations in detail, which do not alter its essentiality, summarized in the following claims.
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9200131A ES2053369B1 (en) | 1992-01-22 | 1992-01-22 | PISTOL FOR ELECTROSTATIC SPRAYING OF POWDERED MATERIAL OF DIFFERENT COLORS AND DIFFERENT CHARACTERISTICS. |
ES9200131 | 1992-01-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0553052A1 true EP0553052A1 (en) | 1993-07-28 |
EP0553052B1 EP0553052B1 (en) | 1996-12-18 |
Family
ID=8275816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19930500006 Expired - Lifetime EP0553052B1 (en) | 1992-01-22 | 1993-01-22 | Gun for electrostatic spraying of powders of different colours and characteristics |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0553052B1 (en) |
ES (2) | ES2053369B1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0813019A1 (en) * | 1996-06-12 | 1997-12-17 | ITW Gema AG | Hose coupling for powder spray apparatus |
JP2001129441A (en) * | 1999-09-16 | 2001-05-15 | Nordson Corp | Powder spray gun |
EP2050506A1 (en) * | 2007-10-19 | 2009-04-22 | Boxal Netherlands B.V. | Powder coating spraying apparatus |
CN111299000A (en) * | 2020-03-12 | 2020-06-19 | 宁波西敦医药包衣科技有限公司 | Dry powder coating electrostatic powder spraying system |
CN114134497A (en) * | 2021-11-30 | 2022-03-04 | 中冶京诚工程技术有限公司 | Nozzle for spraying powder and spraying device |
CN115608530A (en) * | 2022-09-28 | 2023-01-17 | 广东水电二局股份有限公司 | Array type spray head for melt-blown corrosion prevention of large-diameter steel pipe |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0164837B1 (en) * | 1984-05-10 | 1987-10-07 | Nordson Corporation | Electrostatic spray gun |
WO1989002315A1 (en) * | 1987-09-21 | 1989-03-23 | Nordson Corporation | Powder spray gun for quick color change systems |
US5056720A (en) * | 1990-09-19 | 1991-10-15 | Nordson Corporation | Electrostatic spray gun |
-
1992
- 1992-01-22 ES ES9200131A patent/ES2053369B1/en not_active Expired - Fee Related
-
1993
- 1993-01-22 ES ES93500006T patent/ES2097479T3/en not_active Expired - Lifetime
- 1993-01-22 EP EP19930500006 patent/EP0553052B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0164837B1 (en) * | 1984-05-10 | 1987-10-07 | Nordson Corporation | Electrostatic spray gun |
WO1989002315A1 (en) * | 1987-09-21 | 1989-03-23 | Nordson Corporation | Powder spray gun for quick color change systems |
US5056720A (en) * | 1990-09-19 | 1991-10-15 | Nordson Corporation | Electrostatic spray gun |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0813019A1 (en) * | 1996-06-12 | 1997-12-17 | ITW Gema AG | Hose coupling for powder spray apparatus |
JP2001129441A (en) * | 1999-09-16 | 2001-05-15 | Nordson Corp | Powder spray gun |
EP1084759A3 (en) * | 1999-09-16 | 2002-07-31 | Nordson Corporation | Powder spray gun |
EP2050506A1 (en) * | 2007-10-19 | 2009-04-22 | Boxal Netherlands B.V. | Powder coating spraying apparatus |
CN111299000A (en) * | 2020-03-12 | 2020-06-19 | 宁波西敦医药包衣科技有限公司 | Dry powder coating electrostatic powder spraying system |
CN114134497A (en) * | 2021-11-30 | 2022-03-04 | 中冶京诚工程技术有限公司 | Nozzle for spraying powder and spraying device |
CN114134497B (en) * | 2021-11-30 | 2024-01-26 | 中冶京诚工程技术有限公司 | Nozzle for spraying powder and spraying device |
CN115608530A (en) * | 2022-09-28 | 2023-01-17 | 广东水电二局股份有限公司 | Array type spray head for melt-blown corrosion prevention of large-diameter steel pipe |
CN115608530B (en) * | 2022-09-28 | 2023-09-05 | 广东水电二局股份有限公司 | Array type spray head for melt-blowing corrosion prevention of large-diameter steel pipe |
Also Published As
Publication number | Publication date |
---|---|
ES2053369A2 (en) | 1994-07-16 |
ES2053369B1 (en) | 1998-05-01 |
ES2053369R (en) | 1997-05-16 |
EP0553052B1 (en) | 1996-12-18 |
ES2097479T3 (en) | 1997-04-01 |
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