EP1503862A1 - Pump for powder products - Google Patents

Pump for powder products

Info

Publication number
EP1503862A1
EP1503862A1 EP03709551A EP03709551A EP1503862A1 EP 1503862 A1 EP1503862 A1 EP 1503862A1 EP 03709551 A EP03709551 A EP 03709551A EP 03709551 A EP03709551 A EP 03709551A EP 1503862 A1 EP1503862 A1 EP 1503862A1
Authority
EP
European Patent Office
Prior art keywords
pump
powder
products according
nozzles
pumping part
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
Application number
EP03709551A
Other languages
German (de)
French (fr)
Other versions
EP1503862B1 (en
Inventor
Philippe Zimmermann
Joseph Ruegg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pomtava SA
Original Assignee
Pomtava SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pomtava SA filed Critical Pomtava SA
Publication of EP1503862A1 publication Critical patent/EP1503862A1/en
Application granted granted Critical
Publication of EP1503862B1 publication Critical patent/EP1503862B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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

Definitions

  • the present invention relates to a pump for powdery products, in particular for powders used in painting.
  • powder to be applied to an object to be painted is more and more common, in particular for important metallic parts, like frames of machines or car bodies.
  • paint in powder form is introduced into a jet of pressurized air and is sprayed onto the part to be painted, against which it adheres by electrostatic effect.
  • the powder layer is then polymerized, by heating or any other suitable means, so as to permanently adhere the powder against the part.
  • the present invention relates to a pump making it possible to withdraw the powder from a stock of powder and to introduce it into a flow of air under pressure, in order to project it against the part to be painted.
  • a first object of the invention is therefore to propose a pump for powdered products which is improved compared to known pumps and devices, that is to say which does not have their drawbacks.
  • Another object of the invention is to provide a pump for pulverulent products which is of simple and compact, light design and construction, which can be placed in the immediate vicinity of the projection device.
  • Another object of the invention is to provide a pump for powdery products capable of spraying a powdery product in a regular, continuous and exactly dosed manner.
  • Yet another object of the invention is to provide a pump for pulverulent products capable of thinning the powder before it is introduced into the flow of transport air.
  • FIG. 1 is a schematic representation of a powder painting installation showing the integration of a pump according to the invention in said installation
  • FIG. 2 is a schematic longitudinal section of a body of a pump according to the invention
  • FIG. 3 is a cross section along the line III-III of the preceding figure
  • FIG. 4 is a cross section along the line IV-IV of FIG. 2,
  • FIG. 4a is a partial enlarged view of FIG. 4,
  • FIG. 5 is a cross section along the line V-V of FIG. 2.
  • the powder paint installation 1 shown diagrammatically in FIG. 1 comprises a device 2 making it possible to project a jet of powder paint via a pipe 3 and a projection device 30, like a spray gun, against an object to be painted 4.
  • the device 2 is supplied with powder 5 either by gravity from a hopper 50 or, as shown in broken lines, by suction from a tank 51.
  • the device 2, capable of fulfilling the functions described above, represents the pump for powdery products according to the invention.
  • FIG. 2 shows a view in longitudinal section of a pump for powdery products 2 according to an embodiment of the invention.
  • the pump 2 as shown here consists of a pump body 20, a hopper support part 21, and a collecting part 22, these three elements being fixed together by known means, shown diagrammatically at 23.
  • the pump body 20 comprises a first cylindrical hollow housing 200, intended to receive, in the embodiment shown, a pumping part 24, here a gear wheel, which gear is driven in rotation by a shaft 240 extending into a second hollow housing 201, coaxial with the first hollow housing 200 and comprising the means for rotating the shaft 240, for example one or more bearings 241.
  • the shaft 240 is connected to the means for supplying mechanical energy 62 supplied and regulated by the control unit 6 seen above.
  • the bottom face 202 of the first hollow housing 200 comprises a plurality of injection nozzles 203 arranged side by side on a portion of an interior perimeter of said housing. These injection nozzles 203 communicate with an injection chamber 204 arranged in the pump body 20, itself connected by a pipe to a pressurized gas inlet 631, as seen in FIG. 2.
  • the body 20 also comprises a powder supply conduit 205, connected to a corresponding conduit of the hopper support part 21 and opening into the bottom opening of the hopper 50.
  • the other end of the powder supply conduit 205 opens into the upper part of the first hollow housing 200.
  • the conduit 205 therefore puts the first hollow housing 200 into communication with the powder supply hopper 50.
  • the body 20 is still traversed by a pipe 206 connected on the one hand to a second inlet for pressurized gas 632 and opening on the other hand into a collecting chamber 220, arranged in the collecting piece 22.
  • This collecting chamber 220 is connected by a pipe 221 to the pipe 3 for spraying powder paint.
  • FIG. 4 shows the gear 24 in its housing 200. It can be seen in FIG. 4a that, in the embodiment shown, the angular distance separating each nozzle 203 corresponds to a toothing pitch of the gear 24.
  • FIG. 5 shows the face of the collecting piece 22 applied against the pump body 20.
  • the shape of the collecting chamber 220 is determined so as to be able to collect with maximum efficiency the powder blown by the injection nozzles 203 and to mix it intimately with the flow of transport air from line 206.
  • the shape shown here is one of several possible shapes.
  • the hopper 50 is first of all filled with powder, the latter first flowing by gravity through the line 205 to fill the spaces between the teeth of the gear 24 arranged opposite the outlet of the line 205 in the first accommodation 200.
  • the motorized means 60 for example an electric motor, are put into action to drive the gear 24 in clockwise rotation in FIG. 4, via the means of transmission of the mechanical energy 62 and of the shaft 240.
  • the speed of rotation of the gear 24 is relatively low, so that the interdental spaces of the gear 24 are correctly filled with powder when they pass in front of the outlet of the pipe 205.
  • the control unit 6 supplies the injection chamber 204 via a first pipe 631, with a gas, preferably air, with a first flow rate and under a first pressure. This gas then passes through the injection nozzles 203 to expel the powder contained between the teeth of the gear 24. For a determined interdental space, which is filled with powder during its passage opposite the outlet of the pipe 205 , and which arrives in front of the first nozzle
  • control unit 6 supplies the line 206, via a second line 632, with a gas, preferably air, with a second flow rate and under a second pressure.
  • a gas preferably air
  • This gas flow is introduced into the collecting chamber 220, in order to mix intimately with the powder which has been simultaneously introduced therein, as described above, then transport it, via pipes 221 and 3 to the projection device 30.
  • the pulsation effect can be eliminated by providing a series of nozzles 203, of gas passage cross section under equal or increasing pressure, but arranged so that they are never simultaneously uncovered by a gear tooth identically; for example for a determined angular position of the gear, there would be the first nozzle completely uncovered, the last nozzle completely covered, the intermediate nozzles being partially and progressively covered.
  • This constructive arrangement can be combined with a straight or helical shape of the teeth of the gear 24.
  • the elimination of the pulsating effect can be obtained by a combination of the various means. described above, number, spacing and section of the nozzles, shape of the gear and shape of the collecting chamber.
  • Pump 2 has been described and shown as being supplied from above, by gravity from a hopper. It would also be possible to turn the pump over and feed it from below, by suction from a tank, as shown in broken lines in FIG. 1. In this case, an auxiliary pumping means, not shown in the figure can be used to supply the pump 2 with powdery product.
  • the pump 2 comprises means, taking a portion of the pressurized gas introduced into the first housing 200 and sending it towards the hopper, via the line 205. There is thus a slight flow of gas, preferably air, brewing the powder contained in the hopper in order to fluidize it and prevent the formation of a blocking vault.
  • These means may consist, for example, of grooves 25 arranged radially on one or both lateral faces of the gear 24, as seen in FIG.
  • this pump has been described using a gear as a pumping means; in fact the pumping part 24 can consist of any member of revolution comprising a plurality of chambers, regularly distributed over its outer periphery, each of the chambers being able to be individually filled with powder in a radial direction and emptied of its powder in an axial direction or slightly inclined relative to this axial direction, as in the case of the helical toothing of the gear.
  • the gear shown in the figures is therefore only one possible embodiment of this pumping part.
  • the granulometry of the powder as well as the desired powder flow rate on the object to be painted are the main parameters enabling the gas pressures, preferably compressed air, introduced by the lines 631 and 632 to be adjusted, as well as the speed of rotation of the pumping part, these quantities being regulated by the control unit 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Cyclones (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Air Transport Of Granular Materials (AREA)

Abstract

The invention concerns a pump for powder products comprising a pump body (2) including a hollow housing (200) wherein a pumping component (24) is rotated. Powder is introduced radially into chambers provided on the periphery of the pumping component, said powder being then axially driven by nozzles (203) emerging in the hollow housing. The powder is then mixed with an air stream under pressure in a collecting chamber (220), the powder-loaded air stream being then sent towards the user.

Description

Pompe pour produits pulvérulents Pump for powdery products
La présente invention concerne une pompe pour produits pulvérulents, notamment pour des poudres utilisées en peinture.The present invention relates to a pump for powdery products, in particular for powders used in painting.
L'utilisation de poudre, pour être appliquée sur un objet à peindre est de plus en plus courante, en particulier pour des pièces métalliques importantes, comme des bâtis de machines ou des carrosseries d'automobiles. Par ce procédé connu, de la peinture sous forme pulvérulente est introduite dans un jet d'air sous pression et est projetée sur la pièce à peindre, contre laquelle elle adhère par effet électrostatique. La couche de poudre est ensuite polymérisée, par chauffage ou tout autre moyen adéquat, de manière à faire adhérer définitivement la poudre contre la pièce.The use of powder, to be applied to an object to be painted is more and more common, in particular for important metallic parts, like frames of machines or car bodies. By this known method, paint in powder form is introduced into a jet of pressurized air and is sprayed onto the part to be painted, against which it adheres by electrostatic effect. The powder layer is then polymerized, by heating or any other suitable means, so as to permanently adhere the powder against the part.
Dans le cadre de ce procédé de peinture, la présente invention concerne une pompe permettant de prélever la poudre d'un stock de poudre et de l'introduire dans un flux d'air sous pression, afin de la projeter contre la pièce à peindre.In the context of this painting process, the present invention relates to a pump making it possible to withdraw the powder from a stock of powder and to introduce it into a flow of air under pressure, in order to project it against the part to be painted.
Divers dispositifs ont déjà été proposés à cet effet, celui rencontré le plus couramment étant un dispositif comprenant un tube de Venturi, comme décrit par exemple dans EP-A-0.412.289. L'inconvénient majeur des dispositifs de ce type est l'usure du tube Venturi provoquée par abrasion lors du passage des grains de poudre. Très rapidement cette usure provoque une diminution importante du débit de poudre de ces dispositifs. US-B-6.200.111 décrit un dispositif de pompe a pistons pouvant transporter des produits pulvérulents. L'inconvénient de cette pompe est que le frottement du piston provoque un échauffement pouvant polymériser la poudre à l'intérieur du piston, amenant à son blocage. D'autres dispositifs comme des pompes à membranes ont été proposés, ces dispositifs étant généralement de construction ou d'emploi assez complexe. Par ailleurs les dispositifs à piston ou à membrane ont tendance à projeter un jet de poudre sous forme puisante plutôt que continue. Certains des dispositifs proposés sont lourds et encombrants, ce qui fait qu'il est difficile de les disposer à proximité immédiate du dispositif de projection, par exemple du pistolet de peinture.Various devices have already been proposed for this purpose, the one most commonly encountered being a device comprising a Venturi tube, as described for example in EP-A-0.412.289. The major drawback of devices of this type is the wear of the Venturi tube caused by abrasion during the passage of the grains of powder. Very quickly, this wear causes a significant reduction in the powder flow rate of these devices. US-B-6.200.111 describes a piston pump device which can transport powdery products. The disadvantage of this pump is that the friction of the piston causes heating which can polymerize the powder inside the piston, leading to its blocking. Other devices such as diaphragm pumps have been proposed, these devices generally being of rather complex construction or use. Furthermore, piston or membrane devices tend to project a jet of powder in a pulsing rather than continuous form. Some of the proposed devices are heavy and bulky, which makes it difficult to arrange them in the immediate vicinity of the projection device, for example the paint spray gun.
Un premier but de l'invention est donc de proposer une pompe pour produits pulvérulents améliorée par rapport aux pompes et dispositifs connus, c'est-à-dire ne comportant pas leurs inconvénients.A first object of the invention is therefore to propose a pump for powdered products which is improved compared to known pumps and devices, that is to say which does not have their drawbacks.
Un autre but de l'invention est de proposer une pompe pour produits pulvérulents qui soit de conception et de construction simple, compacte et légère, pouvant être disposée à proximité immédiate du dispositif de projection.Another object of the invention is to provide a pump for pulverulent products which is of simple and compact, light design and construction, which can be placed in the immediate vicinity of the projection device.
Un autre but de l'invention est de proposer une pompe pour produits pulvérulents apte à projeter un produit pulvérulent de manière régulière, continue et exactement dosée.Another object of the invention is to provide a pump for powdery products capable of spraying a powdery product in a regular, continuous and exactly dosed manner.
Encore un autre but de l'invention est de proposer une pompe pour produits pulvérulents apte à fluidifier la poudre avant son introduction dans le flux d'air de transport.Yet another object of the invention is to provide a pump for pulverulent products capable of thinning the powder before it is introduced into the flow of transport air.
Ces différents buts sont obtenus par une pompe pour produits pulvérulents telle que décrite dans la revendication indépendante. D'autres formes d'exécution et variantes sont décrites dans les revendications dépendantes.These various aims are obtained by a pump for pulverulent products as described in the independent claim. Other embodiments and variants are described in the dependent claims.
La construction et le fonctionnement d'une forme d'exécution d'une pompe pour produits pulvérulents selon l'invention sont décrits ci- dessous, cette description étant à considérer en regard du dessin annexé comportant les figures où :The construction and operation of an embodiment of a pump for powdery products according to the invention are described below, this description being to be considered with regard to the appended drawing comprising the figures where:
la figure 1 est une représentation schématique d'une installation de peinture à poudre montrant l'intégration d'une pompe selon l'invention dans ladite installation,FIG. 1 is a schematic representation of a powder painting installation showing the integration of a pump according to the invention in said installation,
la figure 2 est une coupe longitudinale schématique d'un corps d'une pompe selon l'invention, la figure 3 est une coupe transversale selon la ligne lll-lll de la figure précédente,FIG. 2 is a schematic longitudinal section of a body of a pump according to the invention, FIG. 3 is a cross section along the line III-III of the preceding figure,
la figure 4 est une coupe transversale selon la ligne IV-IV de la figure 2,FIG. 4 is a cross section along the line IV-IV of FIG. 2,
la figure 4a est une vue partielle agrandie de la figure 4, etFIG. 4a is a partial enlarged view of FIG. 4, and
la figure 5 est une coupe transversale selon la ligne V-V de la figure 2.FIG. 5 is a cross section along the line V-V of FIG. 2.
L'installation de peinture à poudre 1 représentée schématiquement sur la figure 1 comprend un dispositif 2 permettant de projeter un jet de peinture en poudre via une canalisation 3 et un dispositif de projection 30, comme un pistolet, contre un objet à peindre 4. Le dispositif 2 est alimenté en poudre 5 soit par gravité à partir d'une trémie 50, soit, comme représenté en traits discontinus, par aspiration à partir d'une cuve 51. Une unité de commande et de régulation 6, alimentée en énergie mécanique par un moyen motorisé 60 et en pression pneumatique à partir d'un réseau de gaz sous pression 61, fournit au dispositif 2 l'énergie mécanique 62 ainsi que la pression de gaz 63, régulées nécessaires au fonctionnement du dispositif 2 pour la projection d'un flux continu de gaz sous pression transportant une quantité déterminée de peinture en poudre vers l'objet à peindre 4. Le dispositif 2, apte à remplir les fonctions décrites ci-dessus, représente la pompe pour produits pulvérulents selon l'invention.The powder paint installation 1 shown diagrammatically in FIG. 1 comprises a device 2 making it possible to project a jet of powder paint via a pipe 3 and a projection device 30, like a spray gun, against an object to be painted 4. The device 2 is supplied with powder 5 either by gravity from a hopper 50 or, as shown in broken lines, by suction from a tank 51. A control and regulation unit 6, supplied with mechanical energy by motorized means 60 and under pneumatic pressure from a network of pressurized gases 61, supplies the device 2 with mechanical energy 62 as well as the gas pressure 63, regulated necessary for the operation of the device 2 for the projection of a continuous flow of pressurized gas transporting a determined quantity of powder paint to the object to be painted 4. The device 2, capable of fulfilling the functions described above, represents the pump for powdery products according to the invention.
La figure 2 montre une vue en coupe longitudinale d'une pompe pour produits pulvérulents 2 selon une forme d'exécution de l'invention. La pompe 2, telle que représentée ici est constituée d'un corps de pompe 20, d'une pièce support de trémie 21, et d'une pièce collectrice 22, ces trois éléments étant fixés ensemble par des moyens connus, schématisés en 23. Le corps de pompe 20 comprend un premier logement creux cylindrique 200, destiné à recevoir, dans la forme d'exécution représentée, une pièce de pompage 24, ici une roue d'engrenage, lequel engrenage est entraîné en rotation par un arbre 240 se prolongeant dans un deuxième logement creux 201, coaxial avec le premier logement creux 200 et comportant les moyens d'appui en rotation de l'arbre 240, par exemple un ou plusieurs roulements 241. L'arbre 240 est relié aux moyens de fourniture d'énergie mécanique 62 alimentés et régulés par l'unité de commande 6 vue plus haut.FIG. 2 shows a view in longitudinal section of a pump for powdery products 2 according to an embodiment of the invention. The pump 2, as shown here consists of a pump body 20, a hopper support part 21, and a collecting part 22, these three elements being fixed together by known means, shown diagrammatically at 23. The pump body 20 comprises a first cylindrical hollow housing 200, intended to receive, in the embodiment shown, a pumping part 24, here a gear wheel, which gear is driven in rotation by a shaft 240 extending into a second hollow housing 201, coaxial with the first hollow housing 200 and comprising the means for rotating the shaft 240, for example one or more bearings 241. The shaft 240 is connected to the means for supplying mechanical energy 62 supplied and regulated by the control unit 6 seen above.
La face de fond 202 du premier logement creux 200, plus particulièrement visible sur la figure 3, comprend une pluralité de buses d'injection 203 disposées côte à côte sur une portion d'un périmètre intérieur dudit logement. Ces buses d'injection 203 communiquent avec une chambre d'injection 204 aménagée dans le corps de pompe 20, elle- même reliée par une canalisation à une entrée de gaz sous pression 631 , comme on le voit à la figure 2.The bottom face 202 of the first hollow housing 200, more particularly visible in FIG. 3, comprises a plurality of injection nozzles 203 arranged side by side on a portion of an interior perimeter of said housing. These injection nozzles 203 communicate with an injection chamber 204 arranged in the pump body 20, itself connected by a pipe to a pressurized gas inlet 631, as seen in FIG. 2.
Le corps 20 comprend encore un conduit d'alimentation en poudre 205, reliée à un conduit correspondant de la pièce support de trémie 21 et débouchant dans l'ouverture de fond de la trémie 50. L'autre extrémité du conduit d'alimentation en poudre 205 débouche dans la partie supérieure du premier logement creux 200. Le conduit 205 met donc en communication le premier logement creux 200 avec la trémie d'alimentation en poudre 50.The body 20 also comprises a powder supply conduit 205, connected to a corresponding conduit of the hopper support part 21 and opening into the bottom opening of the hopper 50. The other end of the powder supply conduit 205 opens into the upper part of the first hollow housing 200. The conduit 205 therefore puts the first hollow housing 200 into communication with the powder supply hopper 50.
Le corps 20 est encore traversé par une conduite 206 reliée d'une part à une deuxième entrée de gaz sous pression 632 et débouchant d'autre part dans une chambre collectrice 220, aménagée dans la pièce collectrice 22. Cette chambre collectrice 220 est reliée par une conduite 221 à la canalisation 3 de projection de peinture en poudre.The body 20 is still traversed by a pipe 206 connected on the one hand to a second inlet for pressurized gas 632 and opening on the other hand into a collecting chamber 220, arranged in the collecting piece 22. This collecting chamber 220 is connected by a pipe 221 to the pipe 3 for spraying powder paint.
Des détails de construction des éléments décrits ci-dessus sont visibles aux figures 3, 4, 4a et 5, qui sont des coupes transversales prises respectivement selon les lignes lll-lll, IV-IV et V-V de la figure 2.Construction details of the elements described above are visible in Figures 3, 4, 4a and 5, which are cross sections taken respectively along lines III-III, IV-IV and V-V in Figure 2.
Sur la figure 3, on voit la forme particulière donnée à la canalisation 205 à son débouché dans le premier logement creux 200 pour cette forme d'exécution du corps de pompe 2. Partant du fait que l'engrenage 24, visible sur la figure 4, tourne dans le sens horaire, cette forme particulière permet une meilleure répartition de la poudre entre les différentes dents de l'engrenage 24, comme on va le voir ci-après. On remarque encore les différentes buses d'injection 203, cinq dans l'exemple représenté, réparties sur une portion, ici environ % de cadran, d'un périmètre intérieur du logement creux. De préférence, la portion de périmètre occupée par les buses d'injection 203 est directement opposée à la portion de périmètre sur laquelle débouche la canalisation 205. De préférence, et comme on le voit particulièrement sur la figure 4a, les buses 203 ont chacune un diamètre différent, respectivement une section de passage du gaz sous pression différente, le diamètre, respectivement la section, allant en s'agrandissant dans le sens de rotation de l'engrenage 24, soit dans le sens horaire pour la forme d'exécution représentée ici.In Figure 3, we see the particular shape given to the pipe 205 at its outlet in the first hollow housing 200 for this embodiment of the pump body 2. Starting from the fact that the gear 24, visible in Figure 4 , turns clockwise, this particular shape allows a better distribution of the powder between the different teeth of the gear 24, as will be seen below. We also note the different injection nozzles 203, five in the example shown, distributed over a portion, here about% of the dial, of an inner perimeter of the hollow housing. Preferably, the perimeter portion occupied by the injection nozzles 203 is directly opposite the perimeter portion on which the pipe 205 opens. Preferably, and as can be seen particularly in FIG. 4a, the nozzles 203 each have a different diameter, respectively a section of passage of the gas under different pressure, the diameter, respectively the section, increasing in the direction of rotation of the gear 24, or in the clockwise direction for the embodiment shown here .
La figure 4 montre l'engrenage 24 dans son logement 200. On voit sur la figure 4a, que, dans la forme d'exécution représentée, la distance angulaire séparant chaque buse 203 correspond à un pas de denture de l'engrenage 24.FIG. 4 shows the gear 24 in its housing 200. It can be seen in FIG. 4a that, in the embodiment shown, the angular distance separating each nozzle 203 corresponds to a toothing pitch of the gear 24.
La figure 5 montre la face de la pièce collectrice 22 appliquée contre le corps de pompe 20. On distingue la chambre collectrice 220 et la conduite 221. La forme de là chambre collectrice 220 est déterminée de manière à pouvoir collecter avec le maximum d'efficacité la poudre soufflée par les buses d'injection 203 et à la mélanger de manière intime avec le flux d'air de transport en provenance de conduite 206. La forme représentée ici est une parmi plusieurs formes possibles.FIG. 5 shows the face of the collecting piece 22 applied against the pump body 20. A distinction is made between the collecting chamber 220 and the pipe 221. The shape of the collecting chamber 220 is determined so as to be able to collect with maximum efficiency the powder blown by the injection nozzles 203 and to mix it intimately with the flow of transport air from line 206. The shape shown here is one of several possible shapes.
Le fonctionnement de la pompe pour produits pulvérulents, dont les détails de construction d'une forme d'exécution particulière viennent d'être décrits, peut maintenant être précisé.The operation of the pump for pulverulent products, the construction details of which have been described above, can now be explained.
La trémie 50 est tout d'abord remplie de poudre, celle-ci s'écoulant tout d'abord par gravité à travers la conduite 205 pour remplir les espaces entre les dents de l'engrenage 24 disposés en regard du débouché de la conduite 205 dans le premier logement 200. Par l'intermédiaire de l'unité de commande 6, les moyens motorisés 60, par exemple un moteur électrique, sont mis en action pour entraîner l'engrenage 24 en rotation selon le sens horaire de la figure 4, par l'intermédiaire des moyens de transmission de l'énergie mécanique 62 et de l'arbre 240. La vitesse de rotation de l'engrenage 24 est relativement faible, de manière à ce que les espaces interdentaires de l'engrenage 24 se remplissent correctement de poudre lors de leur passage devant le débouché de la conduite 205.The hopper 50 is first of all filled with powder, the latter first flowing by gravity through the line 205 to fill the spaces between the teeth of the gear 24 arranged opposite the outlet of the line 205 in the first accommodation 200. By via the control unit 6, the motorized means 60, for example an electric motor, are put into action to drive the gear 24 in clockwise rotation in FIG. 4, via the means of transmission of the mechanical energy 62 and of the shaft 240. The speed of rotation of the gear 24 is relatively low, so that the interdental spaces of the gear 24 are correctly filled with powder when they pass in front of the outlet of the pipe 205.
L'unité de commande 6 alimente la chambre d'injection 204 par l'intermédiaire d'une première conduite 631 , d'un gaz, de préférence de l'air, avec un premier débit et sous une première pression. Ce gaz passe ensuite par les buses d'injection 203 pour chasser la poudre contenue entre les dents de l'engrenage 24. Pour un espace interdentaire déterminé, qui s'est rempli de poudre lors de son passage en face du débouché de la conduite 205, et qui arrive en face de la première buseThe control unit 6 supplies the injection chamber 204 via a first pipe 631, with a gas, preferably air, with a first flow rate and under a first pressure. This gas then passes through the injection nozzles 203 to expel the powder contained between the teeth of the gear 24. For a determined interdental space, which is filled with powder during its passage opposite the outlet of the pipe 205 , and which arrives in front of the first nozzle
203, celle dont le diamètre et le plus faible, seule une petite portion de la poudre contenu dans cet espace interdentaire est chassée vers la chambre collectrice 220, vu le faible débit de cette buse. En passant ensuite en face de la 2è e buse, dont le diamètre, respectivement le débit de gaz est plus important, une portion plus importante du volume de poudre sera chassé vers la chambre collectrice 220. Il en va de même pour le passage de l'espace interdentaire considéré en face des buses suivantes, jusqu'à la dernière buse, de fort diamètre et de fort débit, qui nettoie complètement l'espace interdentaire de tout reste de poudre. L'espace interdentaire en question ira ensuite se recharger lors de son passage devant le débouché de la conduite 205. La même opération se poursuit pour chacun des espaces interdentaires successifs.203, the one whose diameter and the smallest, only a small portion of the powder contained in this interdental space is expelled towards the collecting chamber 220, given the low flow rate of this nozzle. Then passing in front of the nozzle 2 è e, the diameter, respectively the gas flow rate is greater, a larger portion of the volume of powder will be driven to the collection chamber 220. The same applies to the transition from the interdental space considered opposite the following nozzles, up to the last nozzle, of large diameter and high flow rate, which completely cleans the interdental space of any powder residue. The interdental space in question will then recharge when it passes in front of the outlet of line 205. The same operation continues for each of the successive interdental spaces.
Simultanément, l'unité de commande 6 alimente la conduite 206, par l'intermédiaire d'une deuxième conduite 632, d'un gaz, de préférence de l'air, avec un deuxième débit et sous une deuxième pression. Ce flux gazeux est introduit dans la chambre collectrice 220, afin de se mélanger intimement à la poudre qui y a été simultanément introduite, comme décrit ci-dessus, puis de la transporter, via les canalisations 221 et 3 vers le dispositif de projection 30.Simultaneously, the control unit 6 supplies the line 206, via a second line 632, with a gas, preferably air, with a second flow rate and under a second pressure. This gas flow is introduced into the collecting chamber 220, in order to mix intimately with the powder which has been simultaneously introduced therein, as described above, then transport it, via pipes 221 and 3 to the projection device 30.
Ainsi, en alimentant la pompe 2 en poudre, et en lui fournissant une énergie mécanique et en l'alimentant par un gaz sous deux débits et deux pressions, il est possible de pomper et projeter un produit pulvérulent, en particulier dans une installation de peinture à poudre.Thus, by supplying the pump 2 with powder, and by supplying it with mechanical energy and by supplying it with a gas at two flow rates and two pressures, it is possible to pump and spray a pulverulent product, in particular in a painting installation. to powder.
Vu la faible vitesse de rotation de l'engrenage 24, si on n'avait qu'une seule buse d'injection 203, la projection de poudre vers la chambre collectrice 220 puis vers le dispositif de projection 30 se ferait de manière puisée, le jet de gaz en provenance de la buse 203 étant régulièrement interrompu par le passage d'une dent de l'engrenage. La présence de plusieurs buses successives permet de s'affranchir de cet effet de pulsation et de délivrer un jet de poudre continu et constant.Given the low speed of rotation of the gear 24, if there was only one injection nozzle 203, the projection of powder to the collecting chamber 220 and then to the projection device 30 would be pulsed, the gas jet from the nozzle 203 being regularly interrupted by the passage of a tooth of the gear. The presence of several successive nozzles eliminates this pulsating effect and delivers a continuous and constant powder jet.
La nécessité de délivrer un jet de poudre dont le débit est continu et constant amène à prendre des précautions particulières pour la conception et la construction du système de buses 203, de la pièce de pompage 24 ainsi que de la chambre collectrice 220. Relativement à la forme d'exécution décrite ci-dessus avec la multiplication du nombre de buses 203 espacées de manière à être simultanément découvertes par les dents de l'engrenage, on peut encore améliorer l'effet continu du jet de poudre en prévoyant un engrenage 24 à denture hélicoïdale. Selon encore une autre forme d'exécution, l'effet de pulsation peut être éliminé en prévoyant une série de buses 203, de section de passage de gaz sous pression égale ou croissante, mais disposées de manière à ce qu'elles ne soient jamais simultanément découvertes par une dent de l'engrenage de manière identique ; par exemple pour une position angulaire déterminée de l'engrenage, on aurait la première buse entièrement découverte, la dernière buse complètement couverte, les buses intermédiaires étant partiellement et progressivement couvertes. Cette disposition constructive peut être combinée avec une forme droite ou hélicoïdale des dents de l'engrenage 24. L'élimination de l'effet de pulsation peut être obtenu par une combinaison des différents moyens décrits ci-dessus, nombre, espacement et section des buses, forme de l'engrenage et forme de la chambre collectrice.The need to deliver a jet of powder whose flow is continuous and constant leads to taking special precautions for the design and construction of the nozzle system 203, the pumping part 24 as well as the collecting chamber 220. Relative to the embodiment described above with the multiplication of the number of nozzles 203 spaced so as to be simultaneously discovered by the teeth of the gear, it is possible to further improve the continuous effect of the powder jet by providing a gear 24 with teeth helical. According to yet another embodiment, the pulsation effect can be eliminated by providing a series of nozzles 203, of gas passage cross section under equal or increasing pressure, but arranged so that they are never simultaneously uncovered by a gear tooth identically; for example for a determined angular position of the gear, there would be the first nozzle completely uncovered, the last nozzle completely covered, the intermediate nozzles being partially and progressively covered. This constructive arrangement can be combined with a straight or helical shape of the teeth of the gear 24. The elimination of the pulsating effect can be obtained by a combination of the various means. described above, number, spacing and section of the nozzles, shape of the gear and shape of the collecting chamber.
La pompe 2 a été décrite et représentée comme étant alimentée par le haut, par gravité à partir d'une trémie. Il serait tout aussi possible de retourner la pompe et de l'alimenter par le bas, par aspiration à partir d'une cuve, comme représenté en traits discontinus sur la figure 1. Dans ce cas, un moyen auxiliaire de pompage, non représenté sur la figure, peut être utilisé pour alimenter la pompe 2 en produit pulvérulent.Pump 2 has been described and shown as being supplied from above, by gravity from a hopper. It would also be possible to turn the pump over and feed it from below, by suction from a tank, as shown in broken lines in FIG. 1. In this case, an auxiliary pumping means, not shown in the figure can be used to supply the pump 2 with powdery product.
Pour le cas où l'alimentation en poudre se fait par gravitation à partir d'une trémie, on peut rencontrer le phénomène connu de formation d'une voûte sur la partie inférieure de la trémie, amenant à une rupture d'alimentation en poudre de la pompe 2. Afin d'éviter ceci, la pompe 2 comprend des moyens, prélevant une portion du gaz sous pression introduit dans le premier logement 200 et l'envoyant en direction de la trémie, via la conduite 205. On a ainsi un léger flux de gaz, de préférence d'air, venant brasser la poudre contenue dans la trémie afin de la fluidifier et d'empêcher la formation d'une voûte de blocage. Ces moyens peuvent être constitués par exemple de rainures 25 aménagées radialement sur une ou les deux faces latérales de l'engrenage 24, comme on le voit à la figure 4, ou de un ou plusieurs percement radiaux effectués dans l'engrenage 24, ou d'une ou plusieurs rainures 26 aménagées sur le fond du premier logement 200, comme on le voit à la figure 3, ou de une ou plusieurs rainure 27 aménagées sur la face de la pièce collectrice 22 en contact avec le corps de pompe 20, toutes ces rainures débouchant dans la conduite 205. Un ou plusieurs des moyens décrits ci-dessus peuvent être combinés.In the case where the powder feed is done by gravitation from a hopper, we can meet the known phenomenon of formation of a vault on the lower part of the hopper, leading to a break in the powder feed of the pump 2. In order to avoid this, the pump 2 comprises means, taking a portion of the pressurized gas introduced into the first housing 200 and sending it towards the hopper, via the line 205. There is thus a slight flow of gas, preferably air, brewing the powder contained in the hopper in order to fluidize it and prevent the formation of a blocking vault. These means may consist, for example, of grooves 25 arranged radially on one or both lateral faces of the gear 24, as seen in FIG. 4, or of one or more radial holes made in the gear 24, or d one or more grooves 26 arranged on the bottom of the first housing 200, as seen in Figure 3, or one or more groove 27 arranged on the face of the manifold 22 in contact with the pump body 20, all these grooves opening into the pipe 205. One or more of the means described above can be combined.
La description ci-dessus concerne une forme d'exécution particulière de l'invention ; il est évident que des variantes de construction peuvent être envisagées relativement à ce qui a été décrit. En particulier, cette pompe a été décrite utilisant un engrenage comme moyen de pompage ; en fait la pièce de pompage 24 peut être constituée de tout organe de révolution comprenant une pluralité de chambres, régulièrement réparties sur son pourtour extérieur, chacune des chambres étant apte à être individuellement remplie de poudre selon une direction radiale et vidée de sa poudre selon une direction axiale ou légèrement inclinée relativement à cette direction axiale, comme dans le cas de la denture hélicoïdale de l'engrenage. L'engrenage montré sur les figures n'est donc qu'une forme d'exécution possible de cette pièce de pompage.The above description relates to a particular embodiment of the invention; it is obvious that construction variants can be envisaged in relation to what has been described. In particular, this pump has been described using a gear as a pumping means; in fact the pumping part 24 can consist of any member of revolution comprising a plurality of chambers, regularly distributed over its outer periphery, each of the chambers being able to be individually filled with powder in a radial direction and emptied of its powder in an axial direction or slightly inclined relative to this axial direction, as in the case of the helical toothing of the gear. The gear shown in the figures is therefore only one possible embodiment of this pumping part.
La granulométrie de la poudre ainsi que le débit de poudre désiré sur l'objet à peindre sont les paramètres principaux permettant de régler les pressions de gaz, de préférence d'air comprimé, introduites par les conduites 631 et 632 de même que la vitesse de rotation de la pièce de pompage, ces grandeurs étant réglées par l'unité de commande 6. The granulometry of the powder as well as the desired powder flow rate on the object to be painted are the main parameters enabling the gas pressures, preferably compressed air, introduced by the lines 631 and 632 to be adjusted, as well as the speed of rotation of the pumping part, these quantities being regulated by the control unit 6.

Claims

Revendications claims
1. Pompe pour produits pulvérulents comprenant un corps de pompe (2) comprenant un logement cylindrique creux (200) dans lequel une pièce de pompage (24) est apte à être mise en rotation, ladite pièce de pompage comprenant une pluralité de chambres régulièrement réparties sur son pourtour extérieur, lesdites chambres étant aptes à être individuellement remplies de poudre (5) selon une direction radiale et individuellement vidées de leur contenu de poudre selon une direction différente de la direction de remplissage, caractérisée en ce que le logement cylindrique creux (200) comprend une pluralité de buses d'injection (203) d'un gaz sous une première pression, lesdites buses étant réparties sur un secteur d'un périmètre sur une face de fond dudit logement cylindrique creux.1. Pump for powdery products comprising a pump body (2) comprising a hollow cylindrical housing (200) in which a pumping part (24) is capable of being rotated, said pumping part comprising a plurality of regularly distributed chambers on its outer periphery, said chambers being able to be individually filled with powder (5) in a radial direction and individually emptied of their powder content in a direction different from the filling direction, characterized in that the hollow cylindrical housing (200 ) comprises a plurality of injection nozzles (203) of a gas under a first pressure, said nozzles being distributed over a sector of a perimeter on a bottom face of said hollow cylindrical housing.
2. Pompe pour produits pulvérulents selon la revendication 1 , caractérisée en ce que la direction de vidange desdites chambres est parallèle à l'axe de rotation de la pièce de pompage.2. Pump for powdery products according to claim 1, characterized in that the direction of emptying of said chambers is parallel to the axis of rotation of the pumping part.
3. Pompe pour produits pulvérulents selon la revendication 1 , caractérisée en ce que la direction de vidange desdites chambres est inclinée relativement à l'axe de rotation de la pièce de pompage.3. Pump for powdery products according to claim 1, characterized in that the direction of emptying of said chambers is inclined relative to the axis of rotation of the pumping part.
4. Pompe pour produits pulvérulents selon l'une des revendications précédentes, caractérisée en ce que le logement cylindrique creux (200) est relié à un stock de peinture (50 ; 51) par un conduit d'alimentation de poudre (205), le débouché dudit conduit d'alimentation de poudre dans le logement cylindrique creux ayant lieu sur une portion de secteur de la périphérie du logement creux.4. Pump for powdery products according to one of the preceding claims, characterized in that the hollow cylindrical housing (200) is connected to a paint stock (50; 51) by a powder supply conduit (205), the outlet of said powder supply duct in the hollow cylindrical housing taking place on a sector portion of the periphery of the hollow housing.
5. Pompe pour produits pulvérulents selon la revendication 4, caractérisée en ce que la longueur angulaire de la portion de secteur de la périphérie du logement creux constituant le débouché du conduit d'alimentation de poudre est au moins égale à la longueur angulaire de la portion du pourtour extérieur occupée par une chambre sur ladite pièce de pompage.5. Pump for pulverulent products according to claim 4, characterized in that the angular length of the sector portion of the periphery of the hollow housing constituting the outlet of the powder supply duct is at least equal to the angular length of the portion of the outer periphery occupied by a chamber on said pumping part.
6. Pompe pour produits pulvérulents selon l'une des revendications précédentes, caractérisée en ce que le secteur d'un périmètre de la surface de fond du logement creux sur lequel sont réparties les buses d'injection (203) est diamétralement opposé à la portion de secteur de la périphérie du logement creux constituant le débouché du conduit d'alimentation de poudre (205).6. Pump for powdery products according to one of the preceding claims, characterized in that the sector of a perimeter of the bottom surface of the hollow housing on which are distributed the injection nozzles (203) is diametrically opposite the portion sector of the periphery of the hollow housing constituting the outlet of the powder supply conduit (205).
7. Pompe pour produits pulvérulents selon la revendication 6, caractérisée en ce que l'espacement angulaire entre chaque buse d'injection correspond à l'espacement angulaire entre chaque chambre de la pièce de pompage.7. Pump for pulverulent products according to claim 6, characterized in that the angular spacing between each injection nozzle corresponds to the angular spacing between each chamber of the pumping part.
8. Pompe pour produits pulvérulents selon l'une des revendications 6 ou 7, caractérisée en ce que l'espacement angulaire entre chaque buse d'injection est déterminé de manière à ce que, pour chaque position angulaire de la pièce de pompage, les portions découvertes de chacune des buses soit différentes entre elles.8. Pump for powdery products according to one of claims 6 or 7, characterized in that the angular spacing between each injection nozzle is determined so that, for each angular position of the pumping part, the portions discoveries of each of the nozzles is different from each other.
9. Pompe pour produits pulvérulents selon l'une des revendications 6 à 8, caractérisée en ce que la section de passage de gaz de chacune des buses est différente.9. Pump for pulverulent products according to one of claims 6 to 8, characterized in that the gas passage section of each of the nozzles is different.
10. Pompe pour produits pulvérulents selon la revendication 9, caractérisée en ce que la section desdites buses va en croissant selon la direction de passage des chambres de la pièce de pompage devant lesdites buses.10. Pump for powdery products according to claim 9, characterized in that the section of said nozzles increases in the direction of passage of the chambers of the pumping part in front of said nozzles.
11. Pompe pour produits pulvérulents selon l'une des revendications précédentes, caractérisée en ce que le corps de pompe comprend en outre une chambre collectrice (220) disposée en regard de la face du logement creux opposée à celle munie des buses et en face desdites buses, ladite chambre collectrice étant en outre alimentée en gaz sous une deuxième pression par une conduite d'alimentation (206) de manière à recevoir la poudre chassée hors des chambres de la pièce de pompage par les buses, à mélanger de manière intime cette poudre audit gaz puis à projeter ce flux de gaz chargé de poudre vers une canalisation (3) de projection de poudre.11. Pump for pulverulent products according to one of the preceding claims, characterized in that the pump body further comprises a collecting chamber (220) disposed opposite the face of the hollow housing opposite to that provided with the nozzles and opposite said nozzles, said collecting chamber being further supplied with gas under a second pressure by a supply line ( 206) so as to receive the powder driven out of the chambers of the pumping part by the nozzles, to intimately mix this powder with said gas and then to project this flow of gas charged with powder towards a pipe (3) for spraying powder .
12. Pompe pour produits pulvérulents selon la revendication 4, caractérisée en ce que le stock de peinture est disposé dans une trémie (50) disposée au-dessus dudit corps de pompe, la poudre (5) s'écoulant par gravitation depuis la trémie, via le conduit d'alimentation de poudre (205) vers le logement creux, un moyen de conduite de gaz sous pression reliant le logement creux au fond de la trémie.12. Pump for pulverulent products according to claim 4, characterized in that the paint stock is disposed in a hopper (50) disposed above said pump body, the powder (5) flowing by gravity from the hopper, via the powder supply conduit (205) to the hollow housing, a pressurized gas conduit means connecting the hollow housing to the bottom of the hopper.
13. Pompe pour produits pulvérulents selon la revendication 12, caractérisée en ce que le moyen de conduite de gaz sous pression comprend une pluralité de rainures aménagées radialement sur une ou les deux faces frontales de la pièce de pompage.13. Pump for pulverulent products according to claim 12, characterized in that the pressurized gas pipe means comprises a plurality of grooves arranged radially on one or both front faces of the pumping part.
14. Pompe pour produits pulvérulents selon la revendication 12, caractérisée en ce que le moyen de conduite de gaz sous pression comprend une pluralité de perçages radiaux aménagés dans la pièce de pompage.14. Pump for powdery products according to claim 12, characterized in that the pressurized gas pipe means comprises a plurality of radial bores arranged in the pumping part.
15. Pompe pour produits pulvérulents selon la revendication 12, caractérisée en ce que le moyen de conduite de gaz sous pression comprend une pluralité de rainures aménagées sur une ou les deux faces frontales du logement creux.15. Pump for powdery products according to claim 12, characterized in that the pressurized gas pipe means comprises a plurality of grooves arranged on one or both end faces of the hollow housing.
16. Utilisation d'une pompe pour produits pulvérulents selon l'une des revendications précédentes dans une installation de peinture à poudre. 16. Use of a pump for powdery products according to one of the preceding claims in a powder paint installation.
EP03709551A 2002-05-14 2003-04-14 Pump for powder products Expired - Lifetime EP1503862B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH8032002 2002-05-14
CH803022002 2002-05-14
PCT/CH2003/000248 WO2003095099A1 (en) 2002-05-14 2003-04-14 Pump for powder products

Publications (2)

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EP1503862A1 true EP1503862A1 (en) 2005-02-09
EP1503862B1 EP1503862B1 (en) 2006-06-21

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EP03709551A Expired - Lifetime EP1503862B1 (en) 2002-05-14 2003-04-14 Pump for powder products

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EP (1) EP1503862B1 (en)
AT (1) ATE330708T1 (en)
AU (1) AU2003213976A1 (en)
DE (1) DE60306366T2 (en)
WO (1) WO2003095099A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020212319A1 (en) * 2019-04-16 2020-10-22 Apeva Se Device and method for producing a powder conveyed in a fluid flow

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH252408A (en) * 1946-09-13 1947-12-31 Omo Aktiengesellschaft Method and device for conveying mixtures containing sand and sand from a container to a spray gun.
US2890079A (en) * 1957-07-25 1959-06-09 Us Mineral Wool Company Method of and apparatus for spraying lightweight fibrous and granular particles
DE3926624A1 (en) 1989-08-11 1991-02-14 Gema Ransburg Ag ELECTROSTATIC POWDER COATING DEVICE
US6200111B1 (en) 1999-01-28 2001-03-13 John F. Foss Controllable high volume positive displacement pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03095099A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020212319A1 (en) * 2019-04-16 2020-10-22 Apeva Se Device and method for producing a powder conveyed in a fluid flow

Also Published As

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WO2003095099A1 (en) 2003-11-20
DE60306366T2 (en) 2007-07-05
AU2003213976A1 (en) 2003-11-11
EP1503862B1 (en) 2006-06-21
DE60306366D1 (en) 2006-08-03
ATE330708T1 (en) 2006-07-15

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