EP1503862B1 - Pump for powder products - Google Patents

Pump for powder products Download PDF

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Publication number
EP1503862B1
EP1503862B1 EP03709551A EP03709551A EP1503862B1 EP 1503862 B1 EP1503862 B1 EP 1503862B1 EP 03709551 A EP03709551 A EP 03709551A EP 03709551 A EP03709551 A EP 03709551A EP 1503862 B1 EP1503862 B1 EP 1503862B1
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EP
European Patent Office
Prior art keywords
powder
pump
powder products
pumping part
nozzles
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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
Application number
EP03709551A
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German (de)
French (fr)
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EP1503862A1 (en
Inventor
Philippe Zimmermann
Joseph Ruegg
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Pomtava SA
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Pomtava SA
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Publication date
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Publication of EP1503862A1 publication Critical patent/EP1503862A1/en
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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

Definitions

  • the present invention relates to a pump for powdery products according to US Pat. No. 2,890,079, in particular for powders used in painting.
  • the present invention relates to a pump for taking the powder from a powder stock and to introduce it into a stream of air under pressure, in order to project it against the piece to be painted.
  • piston, membrane or US-2,890,079 devices tend to project a jet of powder in pulsating 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 spray gun.
  • a first object of the invention is therefore to provide a pump for powdered products improved over known pumps and devices, that is to say not having their disadvantages.
  • Another object of the invention is to provide a pump for powdery products which is of simple design and construction, compact and lightweight, which can be arranged in the immediate vicinity of the projection device.
  • Another object of the invention is to propose a pump for pulverulent 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 fluidifying the powder before it is introduced into the transport air stream.
  • the installation of powder paint 1 shown schematically in Figure 1 comprises a device 2 for projecting a spray of powder paint via a pipe 3 and a projection device 30, such as a pistol, against an object to be painted.
  • device 2 is fed 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 performing the functions described above, represents the pump for powdery products according to the invention.
  • FIG. 2 shows a longitudinal sectional view of a pump for pulverulent products 2 according to one embodiment of the invention.
  • the pump as represented here, consists of a pump body 20, a hopper support part 21, and a collecting piece 22, these three elements being fixed together by known means, schematized at 23.
  • the pump body 20 comprises a first cylindrical hollow housing 200, intended to receive, in the embodiment shown, a pumping member 24, here a gear wheel, which gear is rotated by a shaft 240. extending into a second hollow housing 201, coaxial with the first hollow housing 200 and having the means for rotating the shaft 240, for example one or more bearings 241.
  • the shaft 240 is connected to the supply means of 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 inner 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 duct 205, connected to a corresponding duct of the hopper support part 21 and opening into the bottom opening of the hopper 50.
  • the other end of the powder supply duct 205 opens into the upper part of the first hollow housing 200.
  • the conduit 205 thus communicates the first hollow housing 200 with the powder feed hopper 50.
  • the body 20 is still traversed by a pipe 206 connected on the one hand to a second inlet of pressurized gas 632 and opening on the other hand into a collecting chamber 220, arranged in the collecting part 22.
  • This collecting chamber 220 is connected by a pipe 221 to the pipe 3 powder paint projection.
  • FIGS. 3, 4, 4a and 5 are cross-sections taken respectively along the lines III-III, IV-IV and V-V of FIG. 2.
  • 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 gear pitch of the gear 24.
  • FIG. 5 shows the face of the collecting part 22 applied against the pump body 20.
  • the collecting chamber 220 is determined so as to be able to collect with maximum efficiency the powder blown through the injection nozzles 203 and intimately mixing it with the transport air stream from line 206.
  • the shape shown here is one of several possible forms.
  • the hopper 50 is first filled with powder, the latter flowing first by gravity through the pipe 205 to fill the spaces between the teeth of the gear 24 arranged opposite the outlet of the pipe 205 in the first housing 200.
  • the motorized means 60 for example an electric motor, are actuated to drive the gear 24 in rotation in the clockwise direction of FIG. 4, by means of transmission of the mechanical energy 62 and the shaft 240.
  • the speed of rotation of the gear 24 is relatively low, so that the interdental spaces of the gear 24 are filled correctly with powder when they pass in front of them. the outlet of driving 205.
  • the control unit 6 supplies the injection chamber 204 through a first conduit 631, a gas, preferably air, with a first flow 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.
  • a gas preferably air
  • This gas then passes through the injection nozzles 203 to expel the powder contained between the teeth of the gear 24.
  • the one whose diameter and the weakest only a small portion of the powder contained in this interdental space is driven to the collector chamber 220, given the low flow rate of this nozzle.
  • the diameter, the gas flow rate respectively is larger, a larger portion of the volume of powder will be driven to the collection chamber 220.
  • control unit 6 supplies the pipe 206, via a second pipe 632, with a gas, preferably air, with a second flow and under a second pressure.
  • a gas preferably air
  • This gaseous flow is introduced into the collecting chamber 220 so as to intimately mix with the powder which has been simultaneously introduced therein, as described above, then to transport it via the pipes 221 and 3 to the projection device 30.
  • the powder projection to the collection chamber 220 and then to the projection device 30 would be pulsed, the jet of gas from the nozzle 203 being regularly interrupted by the passage of a tooth of the gear.
  • the presence of several successive nozzles makes it possible to overcome this pulsating effect and to deliver a continuous and constant powder jet.
  • the pulsating effect can be eliminated by providing a series of nozzles 203 of gas passage section under equal or increasing pressure, but arranged so that they are never simultaneously discovered by a tooth of the gear in an identical manner; for example for a given angular position of the gear, it would have 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 different means. described above, number, spacing and section of the nozzles, shape of the gear and shape of the collecting chamber.
  • the pump 2 has been described and shown as fed from the top, by gravity from a hopper. It would also be possible to return the pump and feed from below, by suction from a tank, as shown in broken lines in Figure 1. In this case, an auxiliary pumping means, not shown on the figure can be used to supply the pump 2 with a 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 pipe 205. There is thus a slight flow of gas, preferably air, brewing the powder contained in the hopper to fluidize and prevent the formation of a blocking vault.
  • These means may consist for example of grooves 25 arranged radially on one or both side faces of the gear 24, as seen in Figure 4, or one or more radial holes made in the gear 24, or one or more grooves 26 arranged on the bottom of the first housing 200, as seen in Figure 3, or one or more grooves 27 arranged on the face of the collector piece 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.
  • this pump has been described using a gear as a pumping means; in fact the pumping part 24 may consist of any organ of revolution comprising a plurality of chambers, regularly spaced on its outer periphery, each of the chambers being adapted 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 teeth of the gear.
  • the gear shown in the figures is therefore only one possible embodiment of this pumping piece.
  • the particle size of the powder as well as the desired powder flow rate on the object to be painted are the main parameters making it possible to regulate the gas pressures, preferably compressed air, introduced by lines 631 and 632 as well as the speed of rotation of the pumping part, these quantities being regulated by the control unit 6.

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

La présente invention concerne une pompe pour produits pulvérulents selon US-2 890 079 notamment pour des poudres utilisées en peinture.The present invention relates to a pump for powdery products according to US Pat. No. 2,890,079, 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 becoming more common, especially for large metal parts, such as machine frames or car bodies. By this known method, paint in powder form is introduced into a jet of pressurized air and is projected onto the piece 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 workpiece.

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.As part of this painting process, the present invention relates to a pump for taking the powder from a powder stock and to introduce it into a stream of air under pressure, in order to project it against the piece 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, à membrane ou selon US-2 890 079 ont tendance à projeter un jet de poudre sous forme pulsante 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 most commonly encountered being a device comprising a Venturi tube, as described for example in EP-A-0.412.289. The major disadvantage of devices of this type is the wear of the Venturi tube caused by abrasion during the passage of the powder grains. Very quickly this wear causes a significant decrease in the powder flow of these devices. US Pat. No. 6,200,111 describes a piston pump device that can carry powdery products. The disadvantage of this pump is that the friction of the piston causes a heating that can polymerize the powder inside the piston, leading to its blockage. Other devices such as diaphragm pumps have been proposed, these devices being generally of construction or of rather complex use. In addition, piston, membrane or US-2,890,079 devices tend to project a jet of powder in pulsating 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 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 provide a pump for powdered products improved over known pumps and devices, that is to say not having their disadvantages.

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 powdery products which is of simple design and construction, compact and lightweight, which can be arranged 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 propose a pump for pulverulent 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 fluidifying the powder before it is introduced into the transport air stream.

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 different purposes are obtained by a pump for pulverulent products as described in the independent claim. Other embodiments and variations 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 :

  • 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,
  • 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 III-III de la figure précédente,
  • la figure 4 est une coupe transversale selon la ligne IV-IV de la figure 2,
  • la figure 4a est une vue partielle agrandie de la figure 4, et
  • la figure 5 est une coupe transversale selon la ligne V-V de la figure 2.
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 reference to the attached drawing comprising the figures in which:
  • FIG. 1 is a schematic representation of a powder paint 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 an enlarged partial view of FIG. 4, and
  • FIG. 5 is a cross-section along the line VV 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 installation of powder paint 1 shown schematically in Figure 1 comprises a device 2 for projecting a spray of powder paint via a pipe 3 and a projection device 30, such as a pistol, against an object to be painted. device 2 is fed 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 a motorized means 60 and pneumatically pressure from a network of pressurized gas 61, provides the device 2 the mechanical energy 62 and the gas pressure 63, regulated necessary for the operation of the device 2 for the projection of a continuous flow of pressurized gas carrying a determined quantity of powder paint to the object to be painted 4. The device 2, capable of performing 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.Figure 2 shows a longitudinal sectional view of a pump for pulverulent products 2 according to one embodiment of the invention. The pump 2, as represented here, consists of a pump body 20, a hopper support part 21, and a collecting piece 22, these three elements being fixed together by known means, schematized at 23. The pump body 20 comprises a first cylindrical hollow housing 200, intended to receive, in the embodiment shown, a pumping member 24, here a gear wheel, which gear is rotated by a shaft 240. extending into a second hollow housing 201, coaxial with the first hollow housing 200 and having the means for rotating the shaft 240, for example one or more bearings 241. The shaft 240 is connected to the supply means of 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 Figure 3, comprises a plurality of injection nozzles 203 arranged side by side on a portion of an inner 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 duct 205, connected to a corresponding duct of the hopper support part 21 and opening into the bottom opening of the hopper 50. The other end of the powder supply duct 205 opens into the upper part of the first hollow housing 200. The conduit 205 thus communicates the first hollow housing 200 with the powder feed 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 of pressurized gas 632 and opening on the other hand into a collecting chamber 220, arranged in the collecting part 22. This collecting chamber 220 is connected by a pipe 221 to the pipe 3 powder paint projection.

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 III-III, IV-IV et V-V de la figure 2.Construction details of the elements described above are visible in FIGS. 3, 4, 4a and 5, which are cross-sections taken respectively along the lines III-III, IV-IV and V-V of FIG. 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. Based on the fact that the gear 24, visible in Figure 4 , turn 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 still note the different injection nozzles 203, five in the example shown, distributed over a portion, here about% dial, an inner perimeter of the hollow housing. Preferably, the perimeter portion occupied by the injection nozzles 203 is directly opposed to 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 passage section of the gas under different pressure, the diameter, respectively the section, becoming enlarged 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 gear 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 la 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 part 22 applied against the pump body 20. There is a distinction 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 through the injection nozzles 203 and intimately mixing it with the transport air stream from line 206. The shape shown here is one of several possible forms.

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 powdery products, the details of construction of a particular embodiment have just been described, can now be specified.

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 filled with powder, the latter flowing first by gravity through the pipe 205 to fill the spaces between the teeth of the gear 24 arranged opposite the outlet of the pipe 205 in the first housing 200. By by means of the control unit 6, the motorized means 60, for example an electric motor, are actuated to drive the gear 24 in rotation in the clockwise direction of FIG. 4, by means of transmission of the mechanical energy 62 and the shaft 240. The speed of rotation of the gear 24 is relatively low, so that the interdental spaces of the gear 24 are filled correctly with powder when they pass in front of them. the outlet of driving 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 buse 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 2ème 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.The control unit 6 supplies the injection chamber 204 through a first conduit 631, a gas, preferably air, with a first flow 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 has filled with powder when it passes in front of the outlet of the pipe 205 , and which comes opposite the first nozzle 203, the one whose diameter and the weakest, only a small portion of the powder contained in this interdental space is driven to the collector chamber 220, given the low flow rate of this nozzle. Then passing in front of the 2 nd nozzle, the diameter, the gas flow rate respectively is larger, a larger portion of the volume of powder will be driven to the collection chamber 220. The same applies to the transition from interdental space considered in front of the following nozzles, until the last nozzle, large diameter and high flow, which completely cleans the interdental space of any powder remains. The interdental space in question will then be recharged during its passage in front of the outlet of the pipe 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 pipe 206, via a second pipe 632, with a gas, preferably air, with a second flow and under a second pressure. This gaseous flow is introduced into the collecting chamber 220 so as to intimately mix with the powder which has been simultaneously introduced therein, as described above, then to transport it via the 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 supplying it with a gas at two flow rates and two pressures, it is possible to pump and spray a powdery product, in particular in a paint installation. 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 pulsée, 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 rotational speed of the gear 24, if there was only one injection nozzle 203, the powder projection to the collection chamber 220 and then to the projection device 30 would be pulsed, the jet of gas from the nozzle 203 being regularly interrupted by the passage of a tooth of the gear. The presence of several successive nozzles makes it possible to overcome this pulsating effect and to deliver 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 rate is continuous and constant leads to take special precautions for the design and construction of the nozzle system 203, the pumping member 24 and 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 gear teeth, one can further improve the continuous effect of the powder jet by providing a gear 24 toothed helical. According to yet another embodiment, the pulsating effect can be eliminated by providing a series of nozzles 203 of gas passage section under equal or increasing pressure, but arranged so that they are never simultaneously discovered by a tooth of the gear in an identical manner; for example for a given angular position of the gear, it would have 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 different 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.The pump 2 has been described and shown as fed from the top, by gravity from a hopper. It would also be possible to return the pump and feed from below, by suction from a tank, as shown in broken lines in Figure 1. In this case, an auxiliary pumping means, not shown on the figure can be used to supply the pump 2 with a 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 powder feeding is done by gravitation from a hopper, one can encounter the known phenomenon of forming a vault on the lower part of the hopper, leading to a breakage of feed powder. 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 pipe 205. There is thus a slight flow of gas, preferably air, brewing the powder contained in the hopper to fluidize and prevent the formation of a blocking vault. These means may consist for example of grooves 25 arranged radially on one or both side faces of the gear 24, as seen in Figure 4, or one or more radial holes made in the gear 24, or one or more grooves 26 arranged on the bottom of the first housing 200, as seen in Figure 3, or one or more grooves 27 arranged on the face of the collector piece 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 alternative constructions can be envisaged with respect 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 may consist of any organ of revolution comprising a plurality of chambers, regularly spaced on its outer periphery, each of the chambers being adapted 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 teeth of the gear. The gear shown in the figures is therefore only one possible embodiment of this pumping piece.

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 particle size of the powder as well as the desired powder flow rate on the object to be painted are the main parameters making it possible to regulate the gas pressures, preferably compressed air, introduced by lines 631 and 632 as well as the speed of rotation of the pumping part, these quantities being regulated by the control unit 6.

Claims (16)

  1. Pump for powder products comprising a pump body (2) including a hollow cylindrical housing (200) in which a pumping part (24) can be placed in rotation, said pumping part comprising a plurality of chambers evenly distributed on its outer surround, said chambers able to be individually filled with powder (5) in a radial direction and individually emptied of their powder content in a different direction to the filling direction, characterized in that the hollow cylindrical housing (200) comprises a plurality of injection nozzles (203) to inject a gas under a first pressure, said nozzles being distributed over one sector of a perimeter on a bottom face of said hollow cylindrical housing.
  2. Pump for powder products as in claim 1, characterized in that the emptying direction of said chambers is parallel to the rotation axis of the pumping part.
  3. Pump for powder products as in claim 1, characterized in that the emptying direction of said chambers is inclined with respect to the rotation axis of the pumping part.
  4. Pump for powder products as in any of the preceding claims, characterized in that the hollow cylindrical housing (200) is connected to a storage of paint (50;51) via a powder feed line (205), the outlet of said powder feed line in the hollow cylindrical housing being located on a sector portion of the periphery of the hollow housing.
  5. Pump for powder products as in claim 4, characterized in that the angular length of the sector portion of the periphery of the hollow housing forming the outlet of the powder feed line is at least equal to the angular length of the portion of outer surround occupied by a chamber on said pumping part.
  6. Pump for powder products as in any of the preceding claims, characterized in that the sector of a perimeter of the bottom surface of the hollow housing on which the injection nozzles (203) are distributed is diametrically opposite the sector portion of the periphery of the hollow housing forming the outlet of the powder feed line (205).
  7. Pump for powder products as in 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. Pump for powder products as in either 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 uncovered portions of each nozzle are different from each other.
  9. Pump for powder products as in any of claims 6 to 8, characterized in that the gas flow cross-section of each nozzle is different.
  10. Pump for powder products as in claim 9, characterized in that the cross-section of said nozzles increases in the direction in which the chambers of the pumping part pass in front of said nozzles.
  11. Pump for powder products as in any of the preceding claims, characterized in that the pump body also comprises a collector chamber (220) arranged facing the surface of the hollow housing lying opposite the surface provided with nozzles and facing said nozzles, said collector chamber also being supplied with gas under a second pressure by a supply pipe (206) so as to receive the powder expelled from the chambers of the pumping part by the nozzles, to mix this powder closely with said gas and then to project this gas flow containing powder towards a powder spray duct (3).
  12. Pump for powder products as in claim 4, characterized in that the stock of paint is arranged in a hopper (50) arranged above said pump body, the powder (5) flowing under gravity from the hopper via the powder feed line (205) towards the hollow housing, a means for conveying pressurized gas connecting the hollow housing to the bottom of the hopper.
  13. Pump for powder products as in claim 12, characterized in that the conveying means for pressurized gas comprises a plurality of grooves radially arranged on one or both front surfaces of the pumping part.
  14. Pump for powder products as in claim 12, characterized in that the means for conveying pressurized gas comprises a plurality of radial bores arranged in the pumping part.
  15. Pump for powder products as in claim 12, characterized in that the means for conveying pressurized gas comprises a plurality of grooves arranged on one or both front surfaces of the hollow housing.
  16. Use of a pump for powder products as in any of the preceding claims in an installation for powder paint.
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)

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

Family

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Application Number Title Priority Date Filing Date
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)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019110036A1 (en) * 2019-04-16 2020-10-22 Apeva Se Device and method for generating a powder conveyed in a fluid stream

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

Also Published As

Publication number Publication date
AU2003213976A1 (en) 2003-11-11
DE60306366D1 (en) 2006-08-03
DE60306366T2 (en) 2007-07-05
WO2003095099A1 (en) 2003-11-20
ATE330708T1 (en) 2006-07-15
EP1503862A1 (en) 2005-02-09

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