EP0216674B1 - Spraying device for spraying powder - Google Patents

Spraying device for spraying powder Download PDF

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Publication number
EP0216674B1
EP0216674B1 EP86401867A EP86401867A EP0216674B1 EP 0216674 B1 EP0216674 B1 EP 0216674B1 EP 86401867 A EP86401867 A EP 86401867A EP 86401867 A EP86401867 A EP 86401867A EP 0216674 B1 EP0216674 B1 EP 0216674B1
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EP
European Patent Office
Prior art keywords
sprayer according
casing
ejection orifice
cage
nozzle
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.)
Expired - Lifetime
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EP86401867A
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German (de)
French (fr)
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EP0216674A1 (en
Inventor
Jean-Yves Correard
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Sames SA
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Sames SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • B05B7/1445—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means involving vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
    • B06B1/186—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with rotary unbalanced masses

Definitions

  • the invention relates to a sprayer of powder coating product and relates more particularly to the improvement of the homogeneity of the powder jet.
  • Powder spraying is used in the most diverse industrial fields such as: insecticide spraying, the dispersion of mineral or organic additives on metal or plastic parts, during their preparation, to modify their characteristics, spraying additives on the surface of food products or the dispersion of hot melt paint powder on objects to be covered, before passing these objects through an oven. All these applications, and in particular the last mentioned, require a relatively homogeneous powder jet.
  • the powder is generally taken from a reservoir where it is maintained in the fluidized state by a gas stream, in practice air, distributed to the lower part of the reservoir, through a porous bottom wall.
  • a calibrated gas jet sent into a Venturi device, enables the gas-pulverulent mixture to be speeded up and transported, over several meters of pipe, to an ejection device or projector, often having the general shape a "pistol", to facilitate handling.
  • inhomogeneous powder projections are sometimes observed, which can be due to several factors such as in particular the concentration of the mixture and its speed of circulation in the pipe.
  • the flow of the mixture is only regular within a certain range of flow speeds, of the order of 7 to 15 m / s. Below a certain lower limit speed, the flow takes place in packets of powder.
  • a low speed flow also promotes powder deposits in the horizontal parts of the pipe and the projector. Thus, when the latter is held substantially horizontally by the user, which is most of the time the case, there is often an accumulation of powder inside the housing of the projector, which promotes inhomogeneous projection or even partial obturation. .
  • European patent document No. 0131 805 describes a powder spraying system of the type set out in the preamble of claim 1. Such a system incorporates a vibrator mounted on the tank where the air-powder mixture takes place. A coil surrounds the pipe connecting the tank to the projector a certain distance from the tank and the vibrator is coupled to this coil so as to avoid the formation of powder agglomerates in the lower part of the pipe, at the outlet of the tank.
  • the teaching of this document does not make it possible to re-homogenize the air-powder mixture on leaving the projector, especially if other bends have formed in the pipe between the tank and the projector.
  • the invention relates to a sprayer of powder coating product
  • a sprayer of powder coating product comprising a housing provided with a nozzle defining an ejection orifice, a section of flexible conduit communicating with the ejection orifice and connected to means for creating and circulating a mixture of gas and of said product and a means for imparting oscillations to said section, characterized in that said flexible pipe section is formed by the end part of a pipe which passes through the housing and opens into the ejection nozzle, said housing further comprising said means for printing oscillations.
  • the means for printing the oscillations on the aforementioned section may for example be a vibrator integral with the latter or an air flow device of the "Vortex" type arranged to impart an oscillating movement to said section.
  • a powder spraying installation comprising a powdered product projector 11 comprising a housing 12 provided at its front part with a nozzle 13 defining an ejection orifice 14.
  • the the housing is further extended at its lower part by a handle 15 or by means of attachment to a robot arm.
  • a pipe 16 is connected to the rear end of the projector. It is intended to convey an air-pulverulent product mixture taken from a reservoir 17 where said pulverulent product is maintained in the fluidized state by a continuous injection of air at the lower part of the reservoir, through a porous bottom wall. 18.
  • the sampling is carried out by means of a device 19 forming a Venturi, interposed between the pipe 16 and a conduit 19a immersed in the tank. Compressed air is injected into the device 19 through an inlet e.
  • the housing 12 contains means for agitating the mixture, located downstream of the ejection orifice 14 and more particularly constituted here by a section 20 of flexible conduit connected to the means for creating and circulating said mixture , described above and by a means for printing oscillations to said section.
  • the section 20 of flexible conduit is simply formed by the end part of the pipe 16 which passes longitudinally through the housing 12 while being immobilized in leaktight manner at its two ends between the rear wall 21 of the housing and the nozzle 13.
  • the means for printing oscillations on the section 20 is here a vibrator 22 mounted floating in the housing 12 and integral with this section 20.
  • the vibrator 22 is, according to the example, a pneumatic ball vibrator 23. It comprises an annular cage 24 surrounding the section and attached to it. The ball 23 is subject to move inside the cage. A very flexible conduit 25 connected to a source of compressed air (not shown) opens into this cage, approximately tangentially, for injecting air therein in a direction suitable for setting the ball in motion in said cage. This movement causes a circular oscillation of the section 20 of flexible conduit and of the cage itself.
  • the amplitude of the vibrations is high in the section 20, the possibly more concentrated powdered nets will follow trajectories induced by the movement, substantially describing propellers whose pitch is defined by the operating conditions, in particular the speed of the mixture and the speed of rotation of the flexible pipe section.
  • the homogeneity of the jet at the outlet will be significantly improved. If the amplitude of the vibrations is low, we will observe a resuspension of the particles and consequently, here again, a better homogeneity of the jet.
  • the two phenomena course deviation and resuspension
  • the projector further comprises a deflector 26, known per se, located in the axial extension of the ejection orifice 14 and mainly intended to burst the jet to give it a desired opening.
  • FIGs 4 and 5 illustrate a variant of the means for printing oscillations on the section 20.
  • the ball vibrator is here replaced by an annular cavity 28 defined in an annular body 29 fixed to the internal wall of the housing.
  • the section 20 of flexible conduit whose outside diameter is significantly less than the internal diameter of the annular body 29, passes axially through the latter.
  • the cavity 28 communicates by a pipe 30 with a source of compressed air, not shown.
  • the internal side wall 31 of the body 29 is pierced with holes 32 regularly distributed circumferentially in a plane and opening in an inclined manner in the direction of the flexible duct section.
  • This arrangement gives rise to a vortex circulation of the air leaving the cavity 28, of the Vortex type, causing a circular oscillation of the section 20 according to a mode analogous to that of the example in FIG. 1.
  • This arrangement presents the advantage of allowing a more compact housing to be produced for a given oscillation amplitude of the flexible duct section.
  • the air exiting from the ball vibrator can be reused to supply another arrangement capable of defining a vortex type vortex circulation but this time defined at the front of the housing, in the vicinity of the nozzle 13, for example by a set of holes 35 regularly distributed circumferentially tangent to a cylinder and inclined by relative to the axis, that is to say practically in the form of propeller portions, to allow the air to escape towards the outside, at the rear of the nozzle, by creating a circulation eddy contributing in a known way to homogenize the powder jet.
  • the efficiency of this arrangement is significantly improved due to the relative homogeneity of the mixture obtained by the implementation of the invention.
  • the holes 35 can also be slightly inclined in the direction of the axis of the powder jet.
  • FIG. 3 represents another variant in which the similar structural elements bear the same numerical references.
  • the nozzle 13 and consequently the ejection orifice 14 have a larger diameter than the external diameter of the section 20 of flexible conduit and the end 20a of the latter is free of movement in the vicinity of the orifice 14.
  • the means for printing oscillations on the section 20 is here the ball vibrator described with reference to Figure 1 but it is obvious that this vibrator can be replaced by the arrangement of Figures 4 and 5.
  • the section of the nozzle 13 and the ejection orifice 14 may be between 2 and 4 times larger than that of the section 20. The operation is similar to that which has been described with reference to FIG.
  • the ejection orifice 14 does not necessarily have a circular contour. This contour can be oblong and such that at least its largest transverse dimension is greater than the diameter of the section 20, this arrangement producing a flatter jet.
  • the means for imparting vibrations to the section 20 has not been shown but may be, for example, a mechanical vibrator similar to that which is described in FIGS. 1 to 3 or a pneumatic system such as that described in FIGS. 4 and 5.
  • the projector is equipped with removable and interchangeable parts facilitating the assembly and disassembly of the section 20, either to allow its replacement when it is used, or to allow it to replace a section of different diameter, depending on the order of magnitude of the flow rates desired by the user.
  • the projector has a removable connection tip 36, arranged in a cavity 37 of its rear wall.
  • This end piece externally comprises a threaded cylindrical part 38 screwed into a corresponding threaded portion of the cavity 37.
  • the threaded part 38 is extended by a frustoconical part 39 which is itself positioned in a frustoconical part complementary to the cavity 37.
  • the frustoconical part 39 is extended by a cylindrical tubular end 40.
  • a channel 41 passes axially through the end piece 36.
  • the end piece 36 is screwed into the cavity 37, the expanded wall of the section 20 ensuring the seal by being compressed between the two aforementioned frustoconical parts.
  • the end piece 36 is also interchangeable with others, different by the diameter of the channel 41 so as to adapt to the diameter of the flexible section chosen.
  • a nozzle 41 also removable and interchangeable, comprising an axial passage 42 suitable for receiving the other end of the flexible duct section 20.
  • This nozzle comprises, externally, a threaded part and is mounted by screwing into the threaded end of the housing. It comes to bear on an internal transverse wall 44 thereof, by means of an annular seal 45 of flexible and deformable material (foam rubber for example) which, by deforming, ensures both the maintenance of the section of flexible pipe in the nozzle, the sealing of the assembly and the damping of the vibrations transmitted by said section to the housing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

L'invention se rapporte à un projecteur de produit de revêtement pulvérulent et concerne plus particulièrement l'amélioration de l'homogénéité du jet de poudre.The invention relates to a sprayer of powder coating product and relates more particularly to the improvement of the homogeneity of the powder jet.

La projection de poudre est utilisée dans les domaines industriels les plus divers tels que: la pulvérisation d'insecticide, la dispersion d'additifs minéraux ou organiques sur des pièces métalliques ou de matière plastique, lors de leur élaboration, pour en modifier les caractéristiques, la pulvérisation d'ad- juvents à la surface de produits alimentaires ou encore la dispersion de poudre de peinture thermofu- sible sur des objets à recouvrir, préalablement au passage de ces objets dans un four. Toutes ces applications et notamment la dernière citée, nécessitent un jet de poudre relativement homogène. La poudre est généralement prélevée dans un réservoir où elle est maintenue à l'état fluidisé par un courant gazeux, en pratique de l'air, distribué à la partie inférieure du réservoir, au travers d'une paroi de fond poreuse. Un jet de gaz calibré, envoyé dans un dispositif de Venturi, permet la mise en vitesse et le transport du mélange gaz-produit pulvérulent, sur plusieurs mètres de tuyau, jusqu'à un dispositif d'éjection ou projecteur, ayant souvent la forme générale d'un "pistolet", pour en faciliter le maniement. Dans ce type d'installation, on constate parfois des projections de poudre inhomogènes, qui peuvent être dues à plusieurs facteurs comme notamment la concentration du mélange et sa vitesse de circulation dans le tuyau. Tout d'abord, l'écoulement du mélange n'est régulier que dans une certaine plage de vitesses d'écoulement, de l'ordre de 7 à 15 m/s. En-dessous d'une certaine vitesse limite inférieure, l'écoulement se fait par paquets de poudre. Un écoulement à faible vitesse favorise aussi les dépôts de poudre dans les parties horizontales du tuyau et du projecteur. Ainsi, lorsque ce dernier est maintenu sensiblement horizontalement par l'utilisateur, ce qui est la plupart du temps le cas, on observe souvent une accumulation de poudre à l'intérieur du boîtier du projecteur, ce qui favorise une projection inhomogène voire une obturation partielle.Powder spraying is used in the most diverse industrial fields such as: insecticide spraying, the dispersion of mineral or organic additives on metal or plastic parts, during their preparation, to modify their characteristics, spraying additives on the surface of food products or the dispersion of hot melt paint powder on objects to be covered, before passing these objects through an oven. All these applications, and in particular the last mentioned, require a relatively homogeneous powder jet. The powder is generally taken from a reservoir where it is maintained in the fluidized state by a gas stream, in practice air, distributed to the lower part of the reservoir, through a porous bottom wall. A calibrated gas jet, sent into a Venturi device, enables the gas-pulverulent mixture to be speeded up and transported, over several meters of pipe, to an ejection device or projector, often having the general shape a "pistol", to facilitate handling. In this type of installation, inhomogeneous powder projections are sometimes observed, which can be due to several factors such as in particular the concentration of the mixture and its speed of circulation in the pipe. First of all, the flow of the mixture is only regular within a certain range of flow speeds, of the order of 7 to 15 m / s. Below a certain lower limit speed, the flow takes place in packets of powder. A low speed flow also promotes powder deposits in the horizontal parts of the pipe and the projector. Thus, when the latter is held substantially horizontally by the user, which is most of the time the case, there is often an accumulation of powder inside the housing of the projector, which promotes inhomogeneous projection or even partial obturation. .

Par ailleurs, il est néanmoins avantageux de maintenir une vitesse d'écoulement relativement faible pour obtenir un jet assez large et lent, ce qui réduit l'usure de la buse, évite de "souffler" la poudre sur la zone à recouvrir et permet une meilleure charge électrique des particules lorsque le projecteur est du type électrostatique. On ne peut donc pas augmenter sans inconvénient la vitesse de circulation du mélange dans le tuyau. Enfin, une autre cause de "défluidisation" de la poudre (donc d'inhomogénéité de projection) pendant son transfert du réservoir au projecteur, est la force centrifuge créée dans les courbes du tuyau. Cette force centrifuge a en effet tendance à séparer le gaz de transport et la poudre de sorte que des filets de poudre se concentrent dans tous les extérieurs de courbes. Notamment, lorsque le projecteur de produit pulvérulent est maintenu horizontalement, comme mentionné précédemment, le tuyau qui se raccorde à l'arrière de ce projecteur dessine un coude dans un plan sensiblement vertical. La poudre se concentre dans le haut de ce coude, immédiatement à l'arrière du projecteur et dans bien des cas, on observe une éjection de poudre non homogène.Furthermore, it is nevertheless advantageous to maintain a relatively low flow speed in order to obtain a fairly wide and slow jet, which reduces the wear of the nozzle, avoids "blowing" the powder onto the area to be covered and allows a better electrical charge of the particles when the headlamp is of the electrostatic type. It is therefore not possible to increase the circulation speed of the mixture in the pipe without inconvenience. Finally, another cause of "defluidization" of the powder (and therefore of non-uniformity of projection) during its transfer from the reservoir to the projector, is the centrifugal force created in the curves of the pipe. This centrifugal force indeed tends to separate the transport gas and the powder so that the powder streams are concentrated in all of the curve exteriors. In particular, when the spray of powdered product is held horizontally, as mentioned above, the pipe which is connected to the rear of this sprayer draws a bend in a substantially vertical plane. The powder is concentrated at the top of this elbow, immediately behind the projector and in many cases, there is an ejection of non-homogeneous powder.

Pour lutter contre tous ces phénomènes, on a déjà proposé de placer un déflecteur sur l'axe de l'orifice d'éjection. Celui-ci a en outre l'avantage d'élargir le jet de poudre mais les pontets de raccordement de ce déflecteur à l'extrémité du projecteur sont une source supplémentaire d'inhomogénéité de projection. On a aussi proposé de créer un jet d'air tourbillonnaire du type "Vortex" au voisinage de l'orifice d'éjection. Le fonctionnement de tels systèmes repose principalement sur la création de turbulences dans le jet de poudre. Celles-ci augmentent l'usure de la buse et induisent des pertes de charges importantes qui limitent le débit de poudre et favorisent l'usure.To combat all these phenomena, it has already been proposed to place a deflector on the axis of the ejection orifice. This also has the advantage of widening the powder jet, but the connecting bridges of this deflector at the end of the projector are an additional source of projection inhomogeneity. It has also been proposed to create a vortex air jet of the "Vortex" type in the vicinity of the ejection orifice. The operation of such systems is mainly based on the creation of turbulence in the powder jet. These increase the wear of the nozzle and induce significant pressure drops which limit the powder flow and promote wear.

Le document de brevet européen N° 0131 805 décrit un système de projection de poudre du type énoncé dans le préambule de la revendication 1. Un tel système incorpore un vibrateur monté sur la cuve où s'effectue le mélange air-poudre. Un serpentin entoure le tuyau reliant la cuve au projecteur sur une certaine distance à partir de la cuve et le vibrateur est couplé à ce serpentin de façon à éviter la formation d'agglomérats de poudre dans la partie inférieure du tuyau, à la sortie de la cuve. Cependant, l'enseignement de ce document ne permet pas de réhomogénéiser le mélange air-poudre à sa sortie du projecteur, notamment si d'autres coudes se sont formés dans le tuyau entre la cuve et le projecteur.European patent document No. 0131 805 describes a powder spraying system of the type set out in the preamble of claim 1. Such a system incorporates a vibrator mounted on the tank where the air-powder mixture takes place. A coil surrounds the pipe connecting the tank to the projector a certain distance from the tank and the vibrator is coupled to this coil so as to avoid the formation of powder agglomerates in the lower part of the pipe, at the outlet of the tank. However, the teaching of this document does not make it possible to re-homogenize the air-powder mixture on leaving the projector, especially if other bends have formed in the pipe between the tank and the projector.

L'invention concerne un projecteur de produit de revêtement pulvérulent comprenant un boîtier muni d'une buse définissant un orifice d'éjection, un tronçon de conduit souple communiquant avec l'orifice d'éjection et relié à des moyens pour créer et faire circuler un mélange de gaz et dudit produit et un moyen pour imprimer des oscillations audit tronçon, caractérisé en ce que ledit tronçon de conduit souple est formé par la partie terminale d'un conduit qui traverse le boîtier et débouche dans la buse d'éjection, ledit boîtier comportant en outre ledit moyen pour imprimer des oscillations.The invention relates to a sprayer of powder coating product comprising a housing provided with a nozzle defining an ejection orifice, a section of flexible conduit communicating with the ejection orifice and connected to means for creating and circulating a mixture of gas and of said product and a means for imparting oscillations to said section, characterized in that said flexible pipe section is formed by the end part of a pipe which passes through the housing and opens into the ejection nozzle, said housing further comprising said means for printing oscillations.

Le moyen pour imprimer les oscillations au tronçon précité peut par exemple être un vibreur solidaire de celui-ci ou un dispositif d'écoulement d'air du type à "Vortex" agencé pour imprimer un mouvement oscillant audit tronçon.The means for printing the oscillations on the aforementioned section may for example be a vibrator integral with the latter or an air flow device of the "Vortex" type arranged to impart an oscillating movement to said section.

L'invention apparaîtra plus clairement à la lumière de la description qui va suivre de plusieurs modes de réalisation d'un agencement conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels:

  • - la figure 1 représente une installation de projection de produit pulvérulent incluant un projecteur conforme à l'invention;
  • - la figure 2 illustre le fonctionnement du projecteur de la figure 1 ;
  • - la figure 3 illustre un second mode de réalisation d'un projecteur de produit pulvérulent conforme à l'invention, en fonctionnement ;
  • - la figure 4 est une vue de détail d'une autre variante ;
  • - la figure 5 est une coupe V-V de la figure 4; et
  • - la figure 6 illustre un troisième mode de réalisation d'un projecteur de produit pulvérulent conforme à l'invention.
The invention will appear more clearly in the light of the following description of several embodiments of an arrangement in accordance with its principle, given solely by way of example and made with reference to the appended drawings in which:
  • - Figure 1 shows an installation for spraying powdery product including a projector according to the invention;
  • - Figure 2 illustrates the operation of the projector of Figure 1;
  • - Figure 3 illustrates a second embodiment of a pulverulent product projector according to the invention, in operation;
  • - Figure 4 is a detail view of another variant;
  • - Figure 5 is a section VV of Figure 4; and
  • - Figure 6 illustrates a third embodiment of a powdered product projector according to the invention.

En se reportant plus particulièrement aux figures 1 et 2, on a représenté une installation de projection de poudre comprenant un projecteur de produit pulvérulent 11 comportant un boîtier 12 muni à sa partie avant d'une buse 13 définissant un orifice d'éjection 14. Le boîtier est en outre prolongé à sa partie inférieure par une poignée 15 ou par un moyen d'accrochage à un bras de robot. Un tuyau 16 se raccorde à l'extrémité arrière du projecteur. Il est destiné à véhiculer un mélange air-produit pulvérulent prélevé dans un réservoir 17 où ledit produit pulvérulent est maintenu à l'état fluidisé par une injection continue d'air à la partie inférieure du réservoir, au travers d'une paroi de fond poreuse 18. Le prélèvement s'effectue au moyen d'un dispositif 19 formant Venturi, intercalé entre le tuyau 16 et un conduit 19a plongeant dans le réservoir. De l'air comprimé est injecté dans le dispositif 19 par une entrée e.Referring more particularly to Figures 1 and 2, there is shown a powder spraying installation comprising a powdered product projector 11 comprising a housing 12 provided at its front part with a nozzle 13 defining an ejection orifice 14. The the housing is further extended at its lower part by a handle 15 or by means of attachment to a robot arm. A pipe 16 is connected to the rear end of the projector. It is intended to convey an air-pulverulent product mixture taken from a reservoir 17 where said pulverulent product is maintained in the fluidized state by a continuous injection of air at the lower part of the reservoir, through a porous bottom wall. 18. The sampling is carried out by means of a device 19 forming a Venturi, interposed between the pipe 16 and a conduit 19a immersed in the tank. Compressed air is injected into the device 19 through an inlet e.

Selon l'invention, le boîtier 12 renferme des moyens d'agitation du mélange, situés en aval de l'orifice d'éjection 14 et plus particulièrement constitués ici par un tronçon 20 de conduit souple connecté aux moyens pour créer et faire circuler ledit mélange, décrits ci-dessus et par un moyen pour imprimer des oscillations audit tronçon. Dans l'exemple, le tronçon 20 de conduit souple est simplement formé par la partie terminale du tuyau 16 qui traverse longitudinalement le boîtier 12 en étant immobilisé de façon étanche à ses deux extrémités entre la paroi arrière 21 du boîtier et la buse 13. Pour obtenir des oscillations relativement importantes du tronçon 20, ce dernier n'est pas tendu entre ses deux points d'ancrage au repos (figure 1). Le moyen pour imprimer des oscillations au tronçon 20 est ici un vibreur 22 monté flottant dans le boîtier 12 et solidaire de ce tronçon 20. Le vibreur 22 est selon l'exemple un vibreur pneumatique à bille 23. Il comporte une cage annulaire 24 entourant le tronçon et fixée à celui-ci. La bille 23 est assujettie à se déplacer à l'intérieur de la cage. Un conduit très souple 25 relié à une source d'air comprimé (non représentée) débouche dans cette cage, approximativement tangentiellement, pour y injecter de l'air suivant une direction propre à mettre la bille en mouvement dans ladite cage. Ce mouvement provoque une mise en oscillation circulaire du tronçon 20 de conduit souple et de la cage elle-même.According to the invention, the housing 12 contains means for agitating the mixture, located downstream of the ejection orifice 14 and more particularly constituted here by a section 20 of flexible conduit connected to the means for creating and circulating said mixture , described above and by a means for printing oscillations to said section. In the example, the section 20 of flexible conduit is simply formed by the end part of the pipe 16 which passes longitudinally through the housing 12 while being immobilized in leaktight manner at its two ends between the rear wall 21 of the housing and the nozzle 13. For obtain relatively large oscillations of the section 20, the latter is not stretched between its two anchor points at rest (Figure 1). The means for printing oscillations on the section 20 is here a vibrator 22 mounted floating in the housing 12 and integral with this section 20. The vibrator 22 is, according to the example, a pneumatic ball vibrator 23. It comprises an annular cage 24 surrounding the section and attached to it. The ball 23 is subject to move inside the cage. A very flexible conduit 25 connected to a source of compressed air (not shown) opens into this cage, approximately tangentially, for injecting air therein in a direction suitable for setting the ball in motion in said cage. This movement causes a circular oscillation of the section 20 of flexible conduit and of the cage itself.

Ainsi, si l'amplitude des vibrations est forte dans le tronçon 20, les filets éventuellement plus concentrés en poudre vont suivre des trajectoires induites par le mouvement, en décrivant sensiblement des hélices dont le pas est défini par les conditions de fonctionnement, notamment la vitesse du mélange et la vitesse de rotation du tronçon de conduit souple. L'homogénéité du jet à la sortie en sera nettement améliorée. Si l'amplitude des vibrations est faible, on observera une remise en suspension des particules et par conséquent, là encore, une meilleure homogénéité du jet. Les deux phénomènes (déviation de trajectoire et remise en suspension) coexistent généralement.Thus, if the amplitude of the vibrations is high in the section 20, the possibly more concentrated powdered nets will follow trajectories induced by the movement, substantially describing propellers whose pitch is defined by the operating conditions, in particular the speed of the mixture and the speed of rotation of the flexible pipe section. The homogeneity of the jet at the outlet will be significantly improved. If the amplitude of the vibrations is low, we will observe a resuspension of the particles and consequently, here again, a better homogeneity of the jet. The two phenomena (course deviation and resuspension) generally coexist.

Selon l'exemple, le projecteur comporte en outre un déflecteur 26, connu en soi, situé dans le prolongement axial de l'orifice d'éjection 14 et principalement destiné à faire éclater le jet pour lui donner une ouverture voulue.According to the example, the projector further comprises a deflector 26, known per se, located in the axial extension of the ejection orifice 14 and mainly intended to burst the jet to give it a desired opening.

Les figures 4 et 5 illustrent une variante du moyen pour imprimer des oscillations au tronçon 20. Le vibreur à bille est ici remplacé par une cavité annulaire 28 définie dans un corps annulaire 29 fixé à la paroi interne du boîtier. Le tronçon 20 de conduit souple dont le diamètre extérieur est notablement inférieur au diamètre interne du corps annulaire 29, traverse axialement ce dernier. La cavité 28 communique par un tuyau 30 avec une source d'air comprimé, non représentée. La paroi latérale interne 31 du corps 29 est percée de trous 32 régulièrement répartis circonférentiellement dans un plan et débouchant de façon inclinée en direction du tronçon de conduit souple. Cet agencement donne naissance à une circulation tourbillonnaire de l'air sortant de la cavité 28, de type Vortex, entraînant une mise en oscillation circulaire du tronçon 20 suivant un mode analogue à celui de l'exemple de la figure 1. Cet agencement présente l'avantage de permettre de réaliser un boîtier plus compact pour une amplitude d'oscillation donnée du tronçon de conduit souple.Figures 4 and 5 illustrate a variant of the means for printing oscillations on the section 20. The ball vibrator is here replaced by an annular cavity 28 defined in an annular body 29 fixed to the internal wall of the housing. The section 20 of flexible conduit whose outside diameter is significantly less than the internal diameter of the annular body 29, passes axially through the latter. The cavity 28 communicates by a pipe 30 with a source of compressed air, not shown. The internal side wall 31 of the body 29 is pierced with holes 32 regularly distributed circumferentially in a plane and opening in an inclined manner in the direction of the flexible duct section. This arrangement gives rise to a vortex circulation of the air leaving the cavity 28, of the Vortex type, causing a circular oscillation of the section 20 according to a mode analogous to that of the example in FIG. 1. This arrangement presents the advantage of allowing a more compact housing to be produced for a given oscillation amplitude of the flexible duct section.

Il est à noter que dans le cas du mode de réalisation de la figure 1, éventuellement modifié conformément aux figures 4 et 5, l'air sortant du vibreur à bille (ou de la cavité annulaire qui vient d'être décrite) peut être réemployé pour alimenter un autre agencement susceptible de définir une circulation tourbillonnaire de type Vortex mais défini cette fois à l'avant du boîtier, au voisinage de la buse 13, par exemple par un ensemble de trous 35 régulièrement répartis circonférentiellement tangents à un cylindre et inclinés par rapport à l'axe, c'est-à-dire pratiquement en forme de portions d'hélice, pour permettre, à l'air de s'échapper vers l'extérieur, à l'arrière de la buse, en créant une circulation tourbillonnaire contribuant de façon connue à homogénéiser le jet de poudre. L'efficacité de cet agencement est nettement améliorée en raison de la relative homogénéité du mélange obtenue par la mise en oeuvre de l'invention. Les trous 35 peuvent aussi être légèrement inclinés en direction de l'axe du jet de poudre.It should be noted that in the case of the embodiment of FIG. 1, possibly modified in accordance with FIGS. 4 and 5, the air exiting from the ball vibrator (or from the annular cavity which has just been described) can be reused to supply another arrangement capable of defining a vortex type vortex circulation but this time defined at the front of the housing, in the vicinity of the nozzle 13, for example by a set of holes 35 regularly distributed circumferentially tangent to a cylinder and inclined by relative to the axis, that is to say practically in the form of propeller portions, to allow the air to escape towards the outside, at the rear of the nozzle, by creating a circulation eddy contributing in a known way to homogenize the powder jet. The efficiency of this arrangement is significantly improved due to the relative homogeneity of the mixture obtained by the implementation of the invention. The holes 35 can also be slightly inclined in the direction of the axis of the powder jet.

La figure 3 représente une autre variante dans laquelle les éléments de structure analogues portent les mêmes références numériques. Selon cette variante, la buse 13 et par conséquent l'orifice d'éjection 14 ont un diamètre plus important que le diamètre externe du tronçon 20 de conduit souple et l'extrémité 20a de ce dernier est libre de débattement au voisinage de l'orifice 14. Le moyen pour imprimer des oscillations au tronçon 20 est ici le vibreur à bille décrit en référence à la figure 1 mais il est bien évident que ce vibreur peut être remplacé par l'agencement des figures 4 et 5. La section de la buse 13 et de l'orifice d'éjection 14 peut être entre 2 et 4 fois plus grande que celle du tronçon 20. Le fonctionnement est semblable à celui qui a été décrit en référence à la figure 1, avec un jet de produit pulvérulent plus ouvert en raison du mouvement de l'extrémité libre du tronçon 20, comme illustré à la figure 3. Il est à noter que l'orifice d'éjection 14 n'a pas forcément un contour circulaire. Ce contour peut être oblong et tel qu'au moins sa plus grande dimension transversale soit supérieure au diamètre du tronçon 20, cet agencement produisant un jet plus plat.FIG. 3 represents another variant in which the similar structural elements bear the same numerical references. According to this variant, the nozzle 13 and consequently the ejection orifice 14 have a larger diameter than the external diameter of the section 20 of flexible conduit and the end 20a of the latter is free of movement in the vicinity of the orifice 14. The means for printing oscillations on the section 20 is here the ball vibrator described with reference to Figure 1 but it is obvious that this vibrator can be replaced by the arrangement of Figures 4 and 5. The section of the nozzle 13 and the ejection orifice 14 may be between 2 and 4 times larger than that of the section 20. The operation is similar to that which has been described with reference to FIG. 1, with a jet of pulp product verulent more open due to the movement of the free end of the section 20, as illustrated in FIG. 3. It should be noted that the ejection orifice 14 does not necessarily have a circular contour. This contour can be oblong and such that at least its largest transverse dimension is greater than the diameter of the section 20, this arrangement producing a flatter jet.

Sur la variante de la figure 6, le moyen pour imprimer les vibrations au tronçon 20 n'a pas été représenté mais peut être, par exemple, un vibreur mécanique analogue à celui qui est décrit aux figures 1 à 3 ou un système pneumatique tel que celui qui est décrit sur les figures 4 et 5. Le projecteur est équipé de pièces amovibles et interchangeables facilitant le montage et le démontage du tronçon 20, soit pour permettre son remplacement lorsqu'il est usagé, soit pour permettre de lui substituer un tronçon de diamètre différent, en fonction de l'ordre de grandeur des débits souhaités par l'utilisateur.In the variant of FIG. 6, the means for imparting vibrations to the section 20 has not been shown but may be, for example, a mechanical vibrator similar to that which is described in FIGS. 1 to 3 or a pneumatic system such as that described in FIGS. 4 and 5. The projector is equipped with removable and interchangeable parts facilitating the assembly and disassembly of the section 20, either to allow its replacement when it is used, or to allow it to replace a section of different diameter, depending on the order of magnitude of the flow rates desired by the user.

Ainsi, le projecteur comporte un embout de raccordement 36, démontable, agencé dans une cavité 37 de sa paroi arrière. Cet embout comporte extérieurement une partie cylindrique filetée 38 vissée dans une portion taraudée correspondante de la cavité 37. La partie filetée 38 est prolongée par une partie tronconique 39 venant elle-même se positionner dans une partie tronconique complémentaire de la cavité 37. La partie tronconique 39 est prolongée par une extrémité tubulaire cylindrique 40. Un canal 41 traverse axialement l'embout 36. Au montage, le tronçon de tuyau souple 20 est forcé axialement sur l'extrémité tubulaire 40 jusqu'à ce qu'il recouvre au moins partiellement la partie tronconique 39 en s'élargissant. Après quoi, l'embout 36 est vissé dans la cavité 37, la paroi dilatée du tronçon 20 assurant l'étanchéité en étant comprimée entre les deux parties tronconiques précitées. L'embout 36 est aussi interchangeable avec d'autres, différents par le diamètre du canal 41 de façon à s'adapter au diamètre du tronçon souple choisi.Thus, the projector has a removable connection tip 36, arranged in a cavity 37 of its rear wall. This end piece externally comprises a threaded cylindrical part 38 screwed into a corresponding threaded portion of the cavity 37. The threaded part 38 is extended by a frustoconical part 39 which is itself positioned in a frustoconical part complementary to the cavity 37. The frustoconical part 39 is extended by a cylindrical tubular end 40. A channel 41 passes axially through the end piece 36. During assembly, the flexible pipe section 20 is forced axially on the tubular end 40 until it at least partially covers the frustoconical part 39 while widening. After which, the end piece 36 is screwed into the cavity 37, the expanded wall of the section 20 ensuring the seal by being compressed between the two aforementioned frustoconical parts. The end piece 36 is also interchangeable with others, different by the diameter of the channel 41 so as to adapt to the diameter of the flexible section chosen.

Au voisinage de l'orifice d'éjection 14, on prévoit une buse 41 également démontable et interchangeable, comportant un passage axial 42 propre à recevoir l'autre extrémité du tronçon de conduit souple 20. Cette buse comporte, extérieurement, une partie filetée et est montée par vissage dans l'extrémité taraudée du boîtier. Elle vient prendre appui sur une paroi transversale interne 44 de celui-ci, par l'intermédiaire d'un joint annulaire 45 en matériau souple et déformable (caoutchouc mousse par exemple) qui, en se déformant, assure à la fois le maintien du tronçon de tuyau souple dans la buse, l'étanchéité du montage et l'amortissement des vibrations transmises par ledit tronçon au boîtier. Ces vibrations sont encore amorties par un bloc de matériau souple 46 analogue, formant une partie de la poignée 15, au voisinage du raccordement de celle-ci au boîtier 12. Bien entendu, l'agencement de raccordement à l'arrière du boîtier peut être combiné avec le montage de la figure 3 où l'extrémité du tronçon de tuyau souple 20 est laissée libre. De même, le principe du bloc amortisseur dans la poignée est adaptable aux autres modes de réalisation.In the vicinity of the ejection orifice 14, there is provided a nozzle 41 also removable and interchangeable, comprising an axial passage 42 suitable for receiving the other end of the flexible duct section 20. This nozzle comprises, externally, a threaded part and is mounted by screwing into the threaded end of the housing. It comes to bear on an internal transverse wall 44 thereof, by means of an annular seal 45 of flexible and deformable material (foam rubber for example) which, by deforming, ensures both the maintenance of the section of flexible pipe in the nozzle, the sealing of the assembly and the damping of the vibrations transmitted by said section to the housing. These vibrations are further damped by a block of similar flexible material 46, forming a part of the handle 15, in the vicinity of the connection of the latter to the housing 12. Of course, the connection arrangement at the rear of the housing can be combined with the assembly of Figure 3 where the end of the flexible pipe section 20 is left free. Similarly, the principle of the damping block in the handle is adaptable to other embodiments.

Claims (11)

1. A sprayer for spraying a powder coating product comprising a casing (12) provided with a nozzle defining an ejection orifice, a portion (20) of flexible conduit communicating with the ejection orifice and connected to means (16, 17) for creating and circulating a mixture of gas and said product and a means (22, 29) for imparting oscillations to said portion, characterised in that said flexible conduit portion is formed by the terminal part of a conduit which passes through the casing (12) and opens in the ejection nozzle, said casing further comprising said means for imparting oscillations.
2. A sprayer according to claim 1 characterised in that said means for imparting oscillations to said portion comprises a vibrator (22) which is mounted floatingly in said casing and which is fixed with respect to said portion (20).
3. A sprayer according to claim 2 characterised in that said vibrator comprises an annular cage (24) which is disposed around said portion and which is fixed thereto, a ball (23) movable in the interior of said cage and means for injecting air into said cage in a direction such as to cause said ball to move in said cage.
4. A sprayer according to claim 1 characterised in that said means for imparting oscillations to said portion comprises an annular cavity (28) defined in an annular body (29) fixed to the internal wall of said casing and means for injecting air into said cavity, that said portion (20) passes axially through said annular body, the internal diameter of which is greater than that of said portion (20), and that the internal lateral wall (31) of said body is apertured with holes (32) opening inclinedly in the direction of said portion.
5. A sprayer according to one of claims 1 to 4 characterised in that said portion (20) is immobilised at two points within said casing, one of said points being disposed in the vicinity of said ejection orifice (14).
6. A sprayer according to one of claims 1 to 4 characterised in that said ejection orifice (14) has at least one dimension which is larger than the diameter of said portion (20) and that an end (20a) of the latter is free to move in the vicinity of said orifice (Figure 3).
7. A sprayer according to one of claims 3 and 4 characterised in that said casing comprises holes (35) which are disposed circumferentially and helically in the vicinity of said ejection orifice (4) for discharge of the compressed air injected into said cage or annular cavity, creating in known fashion a swirling jet of air to the rear of said ejection orifice.
8. A sprayer according to one of claims 1 to 5 characterised in that ejection orifice (14) is provided with a removable nozzle (41) comprising a passage (42) for receiving an end of said flexible conduit portion (20).
9. A sprayer according to claim 8 characterised in that said nozzle (41) bears against an internal transverse wall (44) of said casing by way of an annular gasket (45) of flexible and deformable material which provides for sealing, retaining and damping vibration in respect of said portion.
10. A sprayer according to one of claims 1 to 9 characterised in that it comprises a removable connecting end portion (36) which is fixed to its rear wall and that the corresponding end of said flexible conduit portion (20) is connected to a duct (41) defined in said end portion.
11. A sprayer according to one of claims 1 to 10 characterised in that it includes a handle (15) comprising at least one part of flexible material (46) for damping the vibration caused by the flexible conduit portion (20) being set in movement.
EP86401867A 1985-09-04 1986-08-25 Spraying device for spraying powder Expired - Lifetime EP0216674B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8513123 1985-09-04
FR8513123A FR2586592B1 (en) 1985-09-04 1985-09-04 METHOD FOR SPRAYING A POWDERY PRODUCT AND SPRAYER FOR A POWDERY PRODUCT USING SUCH A METHOD.

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EP0216674A1 EP0216674A1 (en) 1987-04-01
EP0216674B1 true EP0216674B1 (en) 1990-03-07

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EP86401867A Expired - Lifetime EP0216674B1 (en) 1985-09-04 1986-08-25 Spraying device for spraying powder

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US (1) US4795094A (en)
EP (1) EP0216674B1 (en)
JP (1) JPS6257666A (en)
DE (1) DE3669269D1 (en)
ES (1) ES2002280A6 (en)
FR (1) FR2586592B1 (en)

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JPH0745993Y2 (en) * 1990-12-27 1995-10-18 株式会社ピーエフユー Structure of front shield plate in printed circuit board unit
US5469993A (en) * 1993-12-02 1995-11-28 Monsanto Company Dispensing system
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US5520736A (en) * 1995-01-18 1996-05-28 Plastic Flamecoat Systems, Inc. Vent block for flame spray coating system
USD380148S (en) * 1995-07-19 1997-06-24 Monsanto Company Of St. Louis Dispensing system
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US8056830B1 (en) * 2009-01-02 2011-11-15 Jeff M Pedersen Spinner tip shower head
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FR2586592B1 (en) 1988-07-15
ES2002280A6 (en) 1988-08-01
DE3669269D1 (en) 1990-04-12
EP0216674A1 (en) 1987-04-01
FR2586592A1 (en) 1987-03-06
JPS6257666A (en) 1987-03-13
US4795094A (en) 1989-01-03

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