EP2054161A1 - Automatic spray gun - Google Patents

Automatic spray gun

Info

Publication number
EP2054161A1
EP2054161A1 EP07803821A EP07803821A EP2054161A1 EP 2054161 A1 EP2054161 A1 EP 2054161A1 EP 07803821 A EP07803821 A EP 07803821A EP 07803821 A EP07803821 A EP 07803821A EP 2054161 A1 EP2054161 A1 EP 2054161A1
Authority
EP
European Patent Office
Prior art keywords
product
needle
elastic sealing
sprayed
pistol according
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
EP07803821A
Other languages
German (de)
French (fr)
Other versions
EP2054161B1 (en
Inventor
Patrick Ballu
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.)
Exel Industries SA
Original Assignee
Exel Industries 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 Exel Industries SA filed Critical Exel Industries SA
Publication of EP2054161A1 publication Critical patent/EP2054161A1/en
Application granted granted Critical
Publication of EP2054161B1 publication Critical patent/EP2054161B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/306—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a fluid
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
    • B05B7/1272—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated actuated by gas involved in spraying, i.e. exiting the nozzle, e.g. as a spraying or jet shaping gas

Definitions

  • the invention relates to an automatic spray gun for spraying a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent.
  • a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent.
  • the invention is particularly useful for high pressure and high frequency spraying of ultraviolet radiation curable paints.
  • This type of automatic pistol comprises a pressurized propellant gas chamber supplied with pressurized propellant gas, generally compressed air, and a product chamber fed with pressurized sprays.
  • a spray nozzle of the pressurized spray product is connected to the product chamber. The product is fed to the front of the gun and exits through a calibrated orifice of the nozzle.
  • a slide through the gas chambers and product and provided at its front end with a needle able to close said nozzle.
  • the opening of the needle is triggered by the action of the propellant, usually compressed air.
  • actuating means generally a pneumatic cylinder, adapted to move in translation to close off or disengage said nozzle.
  • the pneumatic cylinder comprises a piston biased in the closed position by a spring and moved into the open position by the propellant.
  • the propellant gas which is used for spraying, aids in the atomization of the product through the central orifice of the nozzle and forms a concentric jet of orientation formed by peripheral vents.
  • the surface of the slider is in contact with the product to be sprayed, which is often abrasive and / or corrosive, as is the case, for example, with enamel.
  • the sealing means may be static or deformable: the static means may be o-rings, scraper seals or similar chevron stops, while the deformable means may comprise a bellows, a membrane or other flexible surface mounted between a fixed part and a moving part of the gun.
  • the document FR 2 863 512 thus describes an automatic spray gun comprising a flexible bellows on the side of the chamber of product to be sprayed.
  • This flexible bellows is attached to the gun body at its rear end and has a movable front end forming a seal around the needle.
  • the needle comprises a shoulder cooperating with the seal formed by the front end of the bellows.
  • the gun of the document FR 2 863 512 has a bellows with turns whose surface is difficult to rinse and clean, especially in the recesses and recesses between the turns.
  • EP 1063018 is an automatic membrane gun in which the needle is secured to the membrane and passes therethrough, so as to be connected to a pulsation control member.
  • a first object of the invention is to improve the known state of the art, by providing a new automatic spray gun for the spraying of a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent. , easy to rinse and clean.
  • a second object of the invention is to provide a new automatic spray gun for spraying a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent, wherein the sealed oscillating means have a low surface in contact with the product to be sprayed.
  • a third object of the invention is to provide a new automatic spray gun for spraying a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent, wherein a protective coating of the oscillating means waterproof is no longer essential.
  • the invention relates to an automatic spray gun for spraying a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent, comprising a body with a front part defining a chamber of product to be sprayed and a rear part for controlling and admitting propellant, a spray head and a product ejection nozzle controlled by a displaceable needle, and means for controlling the displacement of the needle, an elastic sealing means surrounding the needle between the product to be sprayed and the propellant, being mounted clamped between the front and rear parts of the body, characterized in that the elastic sealing means has an elongated tabular conformation whose inner surface is adjusted to the diameters of the needle and a control slide mounted on the needle for the displacement thereof, to contain the pressure of the product to pulptimiser.
  • a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent
  • a body with a front part defining a chamber of
  • the elastic sealing means is fixed at its front end so as to trap it against a shoulder of the needle and to prestress in compression the elastic sealing means.
  • the elastic means is mounted clamped against a portion by screwing a cylindrical liner.
  • the cylindrical pinch sleeve of the elastic sealing means defines the product chamber to be sprayed.
  • the elastic sealing means has an external conformation continuously concave in contact with the product to be sprayed.
  • the stroke of the needle is small, of the order of several millimeters and the variation of the radial dimensions of the elastic sealing means is small, of the order of several tenths of a millimeter.
  • the elastic sealing means has a sleeve-shaped conformation, with a front part bulging radially internally and a rear part bulging radially outwardly.
  • the elastic sealing means is made of a perfluoroelastomer material.
  • control means cooperate with a mechanical shift corresponding to a game and ensuring the opening of the propellant gas before the opening of the product to be sprayed and the closure of the product to be sprayed before closing the propellant.
  • FIG. 1 schematically represents a view in longitudinal section in the direction of line H-II of FIG. FIG. 2 of an automatic pistol according to the invention.
  • FIG. 2 schematically represents a view from above in the direction of the arrow I of FIG. 1 of an automatic pistol according to the invention.
  • an automatic pistol according to the invention comprises a front portion and a rear portion Ib, at least one of which, or Ib, is made of light metal.
  • the front portion 1c contains a cylindrical sleeve 2 made of abrasion resistant material, for example stainless steel, which screwably receives a spray head 3.
  • a cylindrical sleeve 2 made of abrasion resistant material, for example stainless steel, which screwably receives a spray head 3.
  • the spray head 3 has a central orifice 3a and a plurality of peripheral orifices 3b or 3c. Through the product outlet orifice 3a and the thrust-gas outlet orifices 3b or 3c, spraying of the product is obtained by spraying the product fed into the gun under constant pressure, in combination with a spraying air supply which in addition to spraying, it makes it possible to adjust the shape and / or the dimensions of the jet of sprayed product.
  • the spray gun according to the invention comprises means for supplying spray air opening near the spray nozzle 4 to improve the spray and to form the jet of the product.
  • the atomizing air is supplied independently of the product outlet by means of a mechanical shift which feeds the atomizing air into an annular chamber formed in the spray head and which communicates with the first set of orifices 3b. or air nozzles opening close to the outlet 3a of the nozzle 4 and with a second set of orifices 3c located in a ring placed at the front end of the gun body.
  • This arrangement allows the orifices of this second set of orifices 3c to direct the spray air jets at a much greater angle to the jet of the product exiting the nozzle 4.
  • the nozzle 4 is shaped as a ball valve 5 constituting an interchangeable module by screwing into the cylindrical jacket 2.
  • the product to be sprayed is fed under constant pressure through a pipe into a feed chamber 7 of product arranged in the front part of the gun and having a substantially cylindrical ring shape and opening directly into a central channel 8 of the spray head 3 which connects the product supply chamber 7 to a spray nozzle 4.
  • the automatic gun uses a needle 9 which closes the outlet of the product through the nozzle 4.
  • the withdrawal of the needle 9 to clear this outlet is controlled by pneumatic control means acting on the piston 10 of a cylinder 11 moving the needle 9 rearwardly.
  • pneumatic control means acting on the piston 10 of a cylinder 11 moving the needle 9 rearwardly.
  • a return spring 12 acts on the piston 10 in the opposite direction to move the needle 9 forward to close the outlet of the product.
  • the spray gun is also provided with means for supplying spray air opening near the spray nozzle 4.
  • These spray air supply means comprise a compressed air pipe connected to an air duct opening into a generally circular air inlet chamber 17 arranged around a valve 16 in the rear part Ib of the body. of the pistol.
  • This air inlet chamber 17 is, via successive annular passages 18 in communication and which extend in the rear parts Ib and before the body, connected to an outer circular chamber 19 arranged in the head 3 spray.
  • This outer chamber 19 is in communication with the atmosphere through the orifices 3b or 3c opening to the front face of the spray head 4.
  • the control piston 10 of the needle 9 is surrounded by a piston 10a coaxial with the piston 10 and prestressed by position closed by a spring 12a.
  • the front end of the piston 10a tapers to form a valve valve 16 applied to a seat, formed in or secured to the rear portion Ib, by the pressure of the spring 12a.
  • a predetermined set of displacements is provided between the piston 10 and the piston 10a, so that the movement of the piston 10 is controlled in both directions with a shift by a movement of the piston 10a, at the opening as at the closing.
  • the connection between the needle 9 and the piston 10 is provided by a connecting slider 14 passing through the front and rear portions Ib of the gun body.
  • the slider 14 is shaped as a rod screwed at its front end to the needle 9 and secured at its rear end to the piston 10 and to a support plate of the spring 12.
  • the slider 14 is mounted on the needle 9 so as to trap a conformation before 13a of a resilient sealing member 13 against a shoulder 9a of the needle 9 and to prestress in compression the sealing member 13.
  • the rear end 13b of the elastic sealing member 13 is clamped between the front portion or the liner 2 of stainless steel and the rear portion Ib of the gun body, to ensure a recess and a static seal.
  • the elongation and shortening of the member 13 can be performed at high operating frequencies, close to 2 Hz, while ensuring a lifetime of 10 million cycles at high pressures of the order of 120 bar.
  • the elastic sealing member 13 has an elongated tubular conformation, whose inner surface is adjusted to the diameters of the needle and the slide, to contain the pressure exerted by the product to be sprayed on the outer surface of the member 13.
  • the elongate sealing member 13 is constituted in the form of a tubular sleeve with two ends 13a, 13b bulged.
  • the front end 13a is bulged radially internally, while the rear end 13b is bulged radially outwardly.
  • the stroke of the needle 9 is low, of the order of two millimeters.
  • the variation of the radial dimensions is even smaller of the order of one tenth of a millimeter, which allows the use at high operating frequencies, of the order of 2 Hz.
  • the continuously concave shape of the outer surface of the sealing member 13 facilitates the rinsing and cleaning of this outer surface and eliminates the rinsing and cleaning difficulties encountered with the bellows and membranes of the prior art.
  • the substantially cylindrical shape of the outer surface of the sleeve 13 also reduces the area in contact with the product to be sprayed, compared with the bellows and membranes of the prior art.
  • the material used for the manufacture of the sleeve 13 may be a polyurethane, in the case of a specification of resistance to water-soluble products.
  • Polyurethanes are economical and easy to form, preferably by molding, or possibly by machining.
  • the sleeve 13 may be made of perfluoroelastomer material with high chemical inertness.
  • a perfluoroelastomer used is a perfluoroelastomer specially formulated for high pressure medium and explosive decompression conditions, which is satisfactory.
  • the material used for the sleeve 13 may be modified without departing from the scope of the present invention and may optionally be composed of a metallic or non-metallic material.

Landscapes

  • Nozzles (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

An automatic spray gun includes a nozzle (4) for ejecting the product that is to be sprayed, controlled by a needle valve (9), and means (14, 10) for controlling the movement of the needle (9). A tabular elastic sealing means (13) surrounds the needle valve (9) and is mounted trapped between the front (1a) and rear (1b) parts of the body. The interior surface of the tabular means (13) is tailored to the diameters of the needle valve (9) and of a control slide (14) mounted on the needle valve in order to move the needle thereof.

Description

PISTOLET AUTOMATIQUE DE PULVERISATION AUTOMATIC SPRAY GUN
L'invention est relative à un pistolet automatique pour la pulvérisation d'un produit tel qu'une peinture abrasive, une laque, un émail, hydrosoluble ou dissous dans un solvant. L'invention est particulièrement utile pour la pulvérisation à haute pression et à fréquence élevée de peintures réticulables au rayonnement ultraviolet.The invention relates to an automatic spray gun for spraying a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent. The invention is particularly useful for high pressure and high frequency spraying of ultraviolet radiation curable paints.
Ce genre de pistolet automatique comporte une chambre à gaz propulseur sous pression alimentée en gaz propulseur sous pression, généralement de l'air comprimé, et une chambre de produit alimentée en produit à pulvériser sous pression. Une buse de pulvérisation du produit à pulvériser sous pression est reliée à la chambre de produit. Le produit est alimenté à l'avant du pistolet et sort par un orifice calibré de la buse.This type of automatic pistol comprises a pressurized propellant gas chamber supplied with pressurized propellant gas, generally compressed air, and a product chamber fed with pressurized sprays. A spray nozzle of the pressurized spray product is connected to the product chamber. The product is fed to the front of the gun and exits through a calibrated orifice of the nozzle.
De plus, à l'intérieur du pistolet est prévu un coulisseau traversant les chambres de gaz et de produit et pourvu à son extrémité avant d'un pointeau apte à obturer ladite buse.In addition, inside the gun is provided a slide through the gas chambers and product and provided at its front end with a needle able to close said nozzle.
L'ouverture du pointeau est déclenchée par l'action du gaz propulseur, généralement de l'air comprimé.The opening of the needle is triggered by the action of the propellant, usually compressed air.
A son extrémité arrière, le coulisseau est rendu solidaire de moyens d'actionnement, généralement un vérin pneumatique, aptes à le déplacer en translation pour obturer ou dégager ladite buse. Le vérin pneumatique comporte un piston rappelé en position de fermeture par un ressort et déplacé en position d'ouverture par le gaz propulseur.At its rear end, the slider is secured to actuating means, generally a pneumatic cylinder, adapted to move in translation to close off or disengage said nozzle. The pneumatic cylinder comprises a piston biased in the closed position by a spring and moved into the open position by the propellant.
Pour éviter que, le long du coulisseau, du gaz propulseur passe de la chambre de gaz à la chambre de produit et, inversement, que du produit à pulvériser passe de la chambre de produit à la chambre de gaz, on prévoit des moyens oscillants étanches traversés par ledit coulisseau.In order to prevent propellant passing along the slide from the gas chamber to the product chamber and, conversely, that the product to be sprayed passes from the product chamber to the gas chamber, tight oscillating means are provided. traversed by said slider.
Pendant la pulvérisation du produit, le gaz propulseur, dédié à la pulvérisation, aide à l'atomisation du produit par l'orifice central de la buse et forme un jet concentrique d'orientation formé par des évents périphériques.During the spraying of the product, the propellant gas, which is used for spraying, aids in the atomization of the product through the central orifice of the nozzle and forms a concentric jet of orientation formed by peripheral vents.
Dans un tel pistolet automatique connu, ledit coulisseau coulisse à chaque fois qu'il est nécessaire d'ouvrir et de fermer la buse. De manière connue, un décalage est prévu pour ouvrir l'air de pulvérisation avant l'éjection du produit et pour assurer l'obturation de la buse avant la fermeture de l'air de pulvérisation.In such a known automatic gun, said slide slides whenever it is necessary to open and close the nozzle. In known manner, an offset is provided to open the spray air before ejection of the product and to ensure the closure of the nozzle before closing the spray air.
Du côté de la buse, la surface du coulisseau est au contact du produit à pulvériser, qui est souvent abrasif et/ou corrosif, comme cela est par exemple le cas pour l'émail.On the side of the nozzle, the surface of the slider is in contact with the product to be sprayed, which is often abrasive and / or corrosive, as is the case, for example, with enamel.
Les moyens d'étanchéité peuvent être statiques ou déformables : les moyens statiques peuvent être des joints toriques, des joints racleurs ou arrêts analogues à chevrons, tandis que les moyens déformables peuvent comporter un soufflet, une membrane ou autre surface flexible montée entre une partie fixe et une partie mobile du pistolet.The sealing means may be static or deformable: the static means may be o-rings, scraper seals or similar chevron stops, while the deformable means may comprise a bellows, a membrane or other flexible surface mounted between a fixed part and a moving part of the gun.
Le document FR 2 863 512 décrit ainsi un pistolet automatique de pulvérisation comportant un soufflet souple du côté de la chambre de produit à pulvériser. Ce soufflet souple est fixé au corps du pistolet à son extrémité arrière et comporte une extrémité avant mobile formant un joint autour de l'aiguille. L'aiguille comporte un épaulement coopérant avec le joint formé par l'extrémité avant du soufflet.The document FR 2 863 512 thus describes an automatic spray gun comprising a flexible bellows on the side of the chamber of product to be sprayed. This flexible bellows is attached to the gun body at its rear end and has a movable front end forming a seal around the needle. The needle comprises a shoulder cooperating with the seal formed by the front end of the bellows.
Le pistolet du document FR 2 863 512 comporte cependant un soufflet à spires dont la surface est difficile à rincer et à nettoyer, en particulier dans les creux et recoins compris entre les spires. On connaît également du document EP 1063018 un pistolet automatique à membrane dans lequel le pointeau est solidaire de la membrane et traverse celle-ci, de manière à être relié à un organe de commande de pulsation.The gun of the document FR 2 863 512, however, has a bellows with turns whose surface is difficult to rinse and clean, especially in the recesses and recesses between the turns. Also known from EP 1063018 is an automatic membrane gun in which the needle is secured to the membrane and passes therethrough, so as to be connected to a pulsation control member.
Cependant, en raison de la surface importante de la membrane en contact avec le produit, il est nécessaire de la protéger par un revêtement, par exemple par une couche de polytétrafluoréthylène.However, because of the large surface area of the membrane in contact with the product, it is necessary to protect it by a coating, for example by a layer of polytetrafluoroethylene.
Un premier but de l'invention est de perfectionner l'état de la technique connu, en fournissant un nouveau pistolet automatique pour la pulvérisation d'un produit tel qu'une peinture abrasive, une laque, un émail, hydrosoluble ou dissous dans un solvant, facile à rincer et à nettoyer. Un deuxième but de l'invention est de fournir un nouveau pistolet automatique pour la pulvérisation d'un produit tel qu'une peinture abrasive, une laque, un émail, hydrosoluble ou dissous dans un solvant, dans lequel les moyens oscillants étanches présentent une faible surface au contact du produit à pulvériser. Un troisième but de l'invention est de fournir un nouveau pistolet automatique pour la pulvérisation d'un produit tel qu'une peinture abrasive, une laque, un émail, hydrosoluble ou dissous dans un solvant, dans lequel un revêtement de protection des moyens oscillants étanches n'est plus indispensable.A first object of the invention is to improve the known state of the art, by providing a new automatic spray gun for the spraying of a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent. , easy to rinse and clean. A second object of the invention is to provide a new automatic spray gun for spraying a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent, wherein the sealed oscillating means have a low surface in contact with the product to be sprayed. A third object of the invention is to provide a new automatic spray gun for spraying a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent, wherein a protective coating of the oscillating means waterproof is no longer essential.
L'invention a pour objet un pistolet automatique pour la pulvérisation d'un produit tel qu'une peinture abrasive, une laque, un émail, hydrosoluble ou dissous dans un solvant, comportant un corps avec une partie avant définissant une chambre de produit à pulvériser et une partie arrière de commande et d'admission de gaz propulseur, une tête de pulvérisation et une buse d'éjection de produit commandée par un pointeau déplaçable, ainsi que des moyens de commande de déplacement du pointeau, un moyen élastique d'étanchéité entourant le pointeau entre le produit à pulvériser et le gaz propulseur, en étant monté pincé entre les parties avant et arrière du corps, caractérisé par le fait que le moyen élastique d'étanchéité présente une conformation tabulaire allongée dont la surface intérieure est ajustée aux diamètres du pointeau et d'un coulisseau de commande monté sur le pointeau pour le déplacement de celui-ci, pour contenir la pression du produit à pulvériser.The invention relates to an automatic spray gun for spraying a product such as an abrasive paint, a lacquer, an enamel, water-soluble or dissolved in a solvent, comprising a body with a front part defining a chamber of product to be sprayed and a rear part for controlling and admitting propellant, a spray head and a product ejection nozzle controlled by a displaceable needle, and means for controlling the displacement of the needle, an elastic sealing means surrounding the needle between the product to be sprayed and the propellant, being mounted clamped between the front and rear parts of the body, characterized in that the elastic sealing means has an elongated tabular conformation whose inner surface is adjusted to the diameters of the needle and a control slide mounted on the needle for the displacement thereof, to contain the pressure of the product to pulp vériser.
Selon d'autres caractéristiques alternatives de l'invention : le moyen élastique d'étanchéité est fixé à son extrémité avant de manière à emprisonner celle-ci contre un épaulement du pointeau et à précontraindre en compression le moyen élastique d'étanchéité. le moyen élastique est monté pincé contre une partie par vissage d'une chemise cylindrique. la chemise cylindrique de pincement du moyen élastique d'étanchéité définit la chambre de produit à pulvériser. le moyen élastique d'étanchéité présente une conformation externe continûment concave au contact du produit à pulvériser. la course du pointeau est faible, de l'ordre de plusieurs millimètres et la variation des dimensions radiales du moyen élastique d'étanchéité est faible, de l'ordre de plusieurs dixièmes de millimètre. le moyen élastique d'étanchéité présente une conformation en manchon, avec une partie avant renflée radialement intérieurement et une partie arrière renflée radialement extérieurement. le moyen élastique d'étanchéité est fabriqué en un matériau élastomère perfluoré. des moyens de commande coopèrent avec un décalage mécanique correspondant à un jeu et assurant l'ouverture du gaz propulseur avant l'ouverture du produit à pulvériser et la fermeture du produit à pulvériser avant la fermeture du gaz propulseur.According to other alternative features of the invention: the elastic sealing means is fixed at its front end so as to trap it against a shoulder of the needle and to prestress in compression the elastic sealing means. the elastic means is mounted clamped against a portion by screwing a cylindrical liner. the cylindrical pinch sleeve of the elastic sealing means defines the product chamber to be sprayed. the elastic sealing means has an external conformation continuously concave in contact with the product to be sprayed. the stroke of the needle is small, of the order of several millimeters and the variation of the radial dimensions of the elastic sealing means is small, of the order of several tenths of a millimeter. the elastic sealing means has a sleeve-shaped conformation, with a front part bulging radially internally and a rear part bulging radially outwardly. the elastic sealing means is made of a perfluoroelastomer material. control means cooperate with a mechanical shift corresponding to a game and ensuring the opening of the propellant gas before the opening of the product to be sprayed and the closure of the product to be sprayed before closing the propellant.
L'invention sera mieux comprise grâce à la description qui va suivre donnée à titre d'exemple non limitatif en référence aux dessins annexés dans lesquels : la figure 1 représente schématiquement une vue en coupe longitudinale dans le sens de la ligne H-II de la figure 2 d'un pistolet automatique selon l'invention. la figure 2 représente schématiquement une vue de dessus dans le sens de la flèche I de la figure 1 d'un pistolet automatique selon l'invention.The invention will be better understood from the following description given by way of non-limiting example with reference to the accompanying drawings, in which: FIG. 1 schematically represents a view in longitudinal section in the direction of line H-II of FIG. FIG. 2 of an automatic pistol according to the invention. FIG. 2 schematically represents a view from above in the direction of the arrow I of FIG. 1 of an automatic pistol according to the invention.
En référence à la figure 1, un pistolet automatique selon l'invention comporte une partie avant la et une partie arrière Ib, dont au moins l'une, la ou Ib, est réalisée en métal léger.Referring to Figure 1, an automatic pistol according to the invention comprises a front portion and a rear portion Ib, at least one of which, or Ib, is made of light metal.
La partie avant la contient une chemise 2 cylindrique en matériau résistant à l'abrasion, par exemple en acier inoxydable, qui reçoit par vissage une tête 3 de pulvérisation.The front portion 1c contains a cylindrical sleeve 2 made of abrasion resistant material, for example stainless steel, which screwably receives a spray head 3.
La tête 3 de pulvérisation comporte un orifice central 3a et plusieurs orifices 3b ou 3c périphériques. Grâce à l'orifice 3a de sortie du produit et aux orifices 3b ou 3c de sortie de gaz propulseur, la pulvérisation du produit est obtenue par pulvérisation du produit alimenté dans le pistolet sous pression constante, en combinaison avec une alimentation en air de pulvérisation qui, outre la pulvérisation, permet de régler la forme et/ou les dimensions du jet de produit pulvérisé. Le pistolet de pulvérisation selon l'invention comporte des moyens d'alimentation en air de pulvérisation débouchant à proximité de la buse 4 de pulvérisation pour améliorer la pulvérisation et pour former le jet du produit.The spray head 3 has a central orifice 3a and a plurality of peripheral orifices 3b or 3c. Through the product outlet orifice 3a and the thrust-gas outlet orifices 3b or 3c, spraying of the product is obtained by spraying the product fed into the gun under constant pressure, in combination with a spraying air supply which in addition to spraying, it makes it possible to adjust the shape and / or the dimensions of the jet of sprayed product. The spray gun according to the invention comprises means for supplying spray air opening near the spray nozzle 4 to improve the spray and to form the jet of the product.
L'air de pulvérisation est alimenté indépendamment de la sortie du produit à l'aide d'un décalage mécanique qui alimente l'air de pulvérisation dans une chambre annulaire formée dans la tête de pulvérisation et qui communique avec le premier jeu d'orifices 3b ou ajutages d'air débouchant tout près de la sortie 3a de la buse 4 et avec un deuxième jeu d'orifices 3c situé dans une couronne placée à l'extrémité avant du corps du pistolet. Cet agencement permet aux orifices de ce deuxième jeu d'orifices 3c de diriger les jets d'air de pulvérisation sous un angle beaucoup plus grand vers le jet du produit sortant de la buse 4.The atomizing air is supplied independently of the product outlet by means of a mechanical shift which feeds the atomizing air into an annular chamber formed in the spray head and which communicates with the first set of orifices 3b. or air nozzles opening close to the outlet 3a of the nozzle 4 and with a second set of orifices 3c located in a ring placed at the front end of the gun body. This arrangement allows the orifices of this second set of orifices 3c to direct the spray air jets at a much greater angle to the jet of the product exiting the nozzle 4.
La buse 4 est conformée en clapet à bille 5 constituant un module interchangeable par vissage dans la chemise 2 cylindrique.The nozzle 4 is shaped as a ball valve 5 constituting an interchangeable module by screwing into the cylindrical jacket 2.
Le produit à pulvériser est alimenté sous pression constante par un tuyau dans une chambre d'amenée 7 de produit aménagée dans la partie avant du pistolet et ayant une forme sensiblement en anneau cylindrique et débouchant directement dans un canal central 8 de la tête 3 de pulvérisation qui relie la chambre d'amenée 7 de produit à une buse 4 de pulvérisation.The product to be sprayed is fed under constant pressure through a pipe into a feed chamber 7 of product arranged in the front part of the gun and having a substantially cylindrical ring shape and opening directly into a central channel 8 of the spray head 3 which connects the product supply chamber 7 to a spray nozzle 4.
Pour régler l'amenée du produit vers la buse 4 et surtout pour couper cette amenée lorsque le pistolet n'est plus actionné, le pistolet automatique selon l'invention utilise un pointeau 9 qui obture la sortie du produit au travers de la buse 4.To regulate the supply of the product to the nozzle 4 and especially to cut this supply when the gun is no longer actuated, the automatic gun according to the invention uses a needle 9 which closes the outlet of the product through the nozzle 4.
Le retrait du pointeau 9 pour dégager cette sortie est commandé par des moyens de commande pneumatiques qui agissent sur le piston 10 d'un vérin 11 déplaçant le pointeau 9 vers l'arrière. Lorsque les moyens de commande pneumatiques ne sont plus actionnés, un ressort 12 de rappel agit sur le piston 10 dans le sens opposé pour déplacer le pointeau 9 vers l'avant afin de fermer la sortie du produit.The withdrawal of the needle 9 to clear this outlet is controlled by pneumatic control means acting on the piston 10 of a cylinder 11 moving the needle 9 rearwardly. When the pneumatic control means are no longer actuated, a return spring 12 acts on the piston 10 in the opposite direction to move the needle 9 forward to close the outlet of the product.
Lorsque le piston 10 est repoussé par une pulsation d'air de commande vers l'arrière, en comprimant le ressort 12 jusqu'à sa position reculée, l'extrémité du pointeau 9 libère la bille 5 et dégage l'accès à la buse 4 de pulvérisation pour le produit sous pression qui passe de la chambre d'entrée 7 de produit à la buse 4 par l'espacement annulaire défini entre la paroi interne du canal central 8 et la face externe du pointeau 9.When the piston 10 is pushed by a control air pulsation towards the rear, by compressing the spring 12 to its retracted position, the end of the needle 9 releases the ball 5 and releases the access to the nozzle 4 for spraying the product under pressure which passes from the product inlet chamber 7 to the nozzle 4 by the spacing ring defined between the inner wall of the central channel 8 and the outer face of the needle 9.
Afin d'améliorer la pulvérisation et de mieux former le jet de produit pulvérisé qui sort de la buse 4 de pulvérisation, le pistolet est également pourvu de moyens d'alimentation en air de pulvérisation débouchant à proximité de la buse 4 de pulvérisation. Ces moyens d'alimentation en air de pulvérisation comportent un tuyau d'air comprimé connecté à un conduit d'air débouchant dans une chambre d'entrée d'air globalement circulaire 17 aménagée autour d'une vanne 16 dans la partie arrière Ib du corps du pistolet. Cette chambre d'entrée d'air 17 est, par l'intermédiaire de passages annulaires 18 successifs en communication et qui s'étendent dans les parties arrière Ib et avant la du corps, reliée à une chambre circulaire externe 19 aménagée dans la tête 3 de pulvérisation. Cette chambre externe 19 est en communication avec l'atmosphère par les orifices 3b ou 3c débouchant à la face avant de la tête de pulvérisation 4. Le piston 10 de commande du pointeau 9 est entouré par un piston 10a coaxial au piston 10 et précontraint en position fermée par un ressort 12a.In order to improve the spraying and to better form the jet of sprayed product coming out of the spray nozzle 4, the spray gun is also provided with means for supplying spray air opening near the spray nozzle 4. These spray air supply means comprise a compressed air pipe connected to an air duct opening into a generally circular air inlet chamber 17 arranged around a valve 16 in the rear part Ib of the body. of the pistol. This air inlet chamber 17 is, via successive annular passages 18 in communication and which extend in the rear parts Ib and before the body, connected to an outer circular chamber 19 arranged in the head 3 spray. This outer chamber 19 is in communication with the atmosphere through the orifices 3b or 3c opening to the front face of the spray head 4. The control piston 10 of the needle 9 is surrounded by a piston 10a coaxial with the piston 10 and prestressed by position closed by a spring 12a.
L'extrémité avant du piston 10a va en se rétrécissant pour former une vanne 16 à soupape appliquée sur un siège, formé dans ou solidaire de la partie arrière Ib, par la pression du ressort 12a. Un jeu prédéterminé j de déplacement est prévu entre le piston 10 et le piston 10a, de manière que le mouvement du piston 10 soit commandé dans les deux sens avec un décalage par un mouvement du piston 10a, à l'ouverture comme à la fermeture.The front end of the piston 10a tapers to form a valve valve 16 applied to a seat, formed in or secured to the rear portion Ib, by the pressure of the spring 12a. A predetermined set of displacements is provided between the piston 10 and the piston 10a, so that the movement of the piston 10 is controlled in both directions with a shift by a movement of the piston 10a, at the opening as at the closing.
La liaison entre le pointeau 9 et le piston 10 est assurée par un coulisseau 14 de liaison traversant les parties avant la et arrière Ib du corps du pistolet. Le coulisseau 14 est conformé en tige vissée à son extrémité avant sur le pointeau 9 et solidarisée à son extrémité arrière au piston 10 et à un plateau d'appui du ressort 12.The connection between the needle 9 and the piston 10 is provided by a connecting slider 14 passing through the front and rear portions Ib of the gun body. The slider 14 is shaped as a rod screwed at its front end to the needle 9 and secured at its rear end to the piston 10 and to a support plate of the spring 12.
Le coulisseau 14 est monté sur le pointeau 9 de manière à emprisonner une conformation avant 13a d'un organe élastique d'étanchéité 13 contre un épaulement 9a du pointeau 9 et à précontraindre en compression l'organe 13 d'étanchéité. L'extrémité arrière 13b de l'organe élastique 13 d'étanchéité est pincée entre la partie avant la ou sa chemise 2 en acier inoxydable et la partie arrière Ib du corps du pistolet, pour assurer un encastrement et une étanchéité statique.The slider 14 is mounted on the needle 9 so as to trap a conformation before 13a of a resilient sealing member 13 against a shoulder 9a of the needle 9 and to prestress in compression the sealing member 13. The rear end 13b of the elastic sealing member 13 is clamped between the front portion or the liner 2 of stainless steel and the rear portion Ib of the gun body, to ensure a recess and a static seal.
Du fait de l'élasticité de l'organe 13 d'étanchéité, l'allongement et le raccourcissement de l'organe 13 peuvent s'effectuer à des fréquences d'actionnement élevées, voisines de 2Hz, tout en assurant une durée de vie de 10 millions de cycles à des pressions élevées de l'ordre de 120 bar.Due to the elasticity of the sealing member 13, the elongation and shortening of the member 13 can be performed at high operating frequencies, close to 2 Hz, while ensuring a lifetime of 10 million cycles at high pressures of the order of 120 bar.
Avantageusement, l'organe 13 élastique d'étanchéité présente une conformation tubulaire allongée, dont la surface intérieure est ajustée aux diamètres du pointeau et du coulisseau, pour contenir la pression exercée par le produit à pulvériser sur la surface extérieure de l'organe 13.Advantageously, the elastic sealing member 13 has an elongated tubular conformation, whose inner surface is adjusted to the diameters of the needle and the slide, to contain the pressure exerted by the product to be sprayed on the outer surface of the member 13.
De préférence, l'organe 13 allongé d'étanchéité est constitué sous forme d'un manchon tubulaire à deux extrémités 13 a, 13b renflées.Preferably, the elongate sealing member 13 is constituted in the form of a tubular sleeve with two ends 13a, 13b bulged.
L'extrémité avant 13a est renflée radialement intérieurement, tandis que l'extrémité arrière 13b, est renflée radialement extérieurement.The front end 13a is bulged radially internally, while the rear end 13b is bulged radially outwardly.
En raison du fait que l'action du pointeau 9 est de maintenir la bille 5 au contact de son siège ou d'autoriser son décollement, la course du pointeau 9 est faible, de l'ordre de deux millimètres.Due to the fact that the action of the needle 9 is to maintain the ball 5 in contact with its seat or to allow its detachment, the stroke of the needle 9 is low, of the order of two millimeters.
La variation des dimensions radiales est encore plus faible de l'ordre du dixième de millimètre, ce qui autorise l'emploi à des fréquences d'actionnement élevées, de l'ordre de 2Hz.The variation of the radial dimensions is even smaller of the order of one tenth of a millimeter, which allows the use at high operating frequencies, of the order of 2 Hz.
La forme continûment concave de la surface extérieure de l'organe 13 d'étanchéité facilite le rinçage et le nettoyage de cette surface extérieure et supprime les difficultés de rinçage et de nettoyage rencontrées avec les soufflets et membranes de l'art antérieur.The continuously concave shape of the outer surface of the sealing member 13 facilitates the rinsing and cleaning of this outer surface and eliminates the rinsing and cleaning difficulties encountered with the bellows and membranes of the prior art.
La forme sensiblement cylindrique de la surface extérieure du manchon 13 permet également de réduire, la surface au contact du produit à pulvériser, par comparaison avec les soufflets et membranes de l'art antérieur.The substantially cylindrical shape of the outer surface of the sleeve 13 also reduces the area in contact with the product to be sprayed, compared with the bellows and membranes of the prior art.
Le matériau utilisé pour la fabrication du manchon 13 peut être un polyuréthane, dans le cas d'une spécification de résistance aux produits hydrosolubles. Les polyuréthanes sont économiques et faciles à mettre en forme de préférence par moulage, ou éventuellement par usinage.The material used for the manufacture of the sleeve 13 may be a polyurethane, in the case of a specification of resistance to water-soluble products. Polyurethanes are economical and easy to form, preferably by molding, or possibly by machining.
Dans le cas d'une résistance à tous types de produits à pulvériser, hydrosolubles ou dissous dans un solvant, le manchon 13 peut être fabriqué en matériau élastomère perfluoré à grande inertie chimique.In the case of resistance to all types of spray products, water-soluble or dissolved in a solvent, the sleeve 13 may be made of perfluoroelastomer material with high chemical inertness.
Un élastomère perfluoré utilisé est un perfluoroélastomère spécialement formulé pour milieu de haute pression et conditions de décompression explosive, qui donne satisfaction.A perfluoroelastomer used is a perfluoroelastomer specially formulated for high pressure medium and explosive decompression conditions, which is satisfactory.
L'invention n'est pas limitée au mode de réalisation décrit, mais couvre au contraire toute modification de forme et toute variante de réalisation dans le cadre et l'esprit de l'invention.The invention is not limited to the embodiment described, but on the contrary covers any change of shape and any variant embodiment within the scope and spirit of the invention.
Ainsi, le matériau utilisé pour le manchon 13 peut être modifié sans sortir du cadre de la présente invention et peut éventuellement être composé à partir d'un matériau métallique ou non métallique. Thus, the material used for the sleeve 13 may be modified without departing from the scope of the present invention and may optionally be composed of a metallic or non-metallic material.

Claims

REVENDICATIONS
1. Pistolet automatique pour la pulvérisation d'un produit tel qu'une peinture abrasive, une laque, un émail, hydrosoluble ou dissous dans un solvant, comportant un corps avec une partie avant (la) définissant une chambre (7) de produit à pulvériser et une partie arrière (Ib) de commande et d'admission de gaz propulseur, une tête (3) de pulvérisation et une buse (4) d'éjection de produit commandée par un pointeau (9) déplaçable, ainsi que des moyens (14, 10) de commande de déplacement du pointeau (9), un moyen (13) élastique d'étanchéité entourant le pointeau (9) entre le produit à pulvériser et le gaz propulseur, en étant monté pincé entre les parties avant (la) et arrière (Ib) du corps, caractérisé par le fait que le moyen (13) élastique d'étanchéité présente une conformation tubulaire allongée dont la surface intérieure est ajustée aux diamètres du pointeau (9) et d'un coulisseau de commande (14) monté sur le pointeau (9) pour le déplacement de celui-ci, pour contenir la pression du produit à pulvériser. An automatic spray gun for spraying a product such as abrasive paint, lacquer, enamel, water-soluble or dissolved in a solvent, comprising a body with a front portion (1a) defining a chamber (7) of spraying and a propellant control and intake rear part (Ib), a spraying head (3) and a product ejection nozzle (4) controlled by a displaceable needle (9), and means ( 14, 10) for controlling movement of the needle (9), elastic sealing means (13) surrounding the needle (9) between the product to be sprayed and the propellant, being clamped between the front parts (1a). and rear (Ib) of the body, characterized in that the elastic sealing means (13) has an elongate tubular conformation whose inner surface is adjusted to the diameters of the needle (9) and a control slide (14). mounted on the needle (9) for the displacement of this it, to contain the pressure of the product to be sprayed.
2. Pistolet automatique selon la revendication 1, caractérisé par le fait que le moyen (13) élastique d'étanchéité est fixé à son extrémité avant (13a) de manière à emprisonner celle-ci contre un épaulement (9a) du pointeau (9) et à précontraindre en compression le moyen élastique d'étanchéité (13).2. Automatic pistol according to claim 1, characterized in that the elastic sealing means (13) is fixed at its front end (13a) so as to trap it against a shoulder (9a) of the needle (9). and prestressing in compression the elastic sealing means (13).
3. Pistolet automatique selon la revendication 1 ou 2, caractérisé par le fait que le moyen élastique (13) est monté pincé contre l'une desdites parties (la ou Ib) par vissage d'une chemise (2) cylindrique.3. Automatic pistol according to claim 1 or 2, characterized in that the elastic means (13) is mounted clamped against one of said parts (la or Ib) by screwing a sleeve (2) cylindrical.
4. Pistolet automatique selon la revendication 3, caractérisé par le fait que la chemise (2) cylindrique de pincement du moyen (13) élastique d'étanchéité définit la chambre (7) de produit à pulvériser. 4. Automatic pistol according to claim 3, characterized in that the sleeve (2) cylindrical clamping means (13) elastic sealing defines the chamber (7) of product to be sprayed.
5. Pistolet automatique selon l'une quelconque des revendications précédentes, caractérisé par le fait que le moyen (13) élastique d'étanchéité présente une conformation externe continûment concave au contact du produit à pulvériser.5. Automatic pistol according to any one of the preceding claims, characterized in that the means (13) elastic sealing has an external conformation continuously concave in contact with the product to be sprayed.
6. Pistolet automatique selon l'une quelconque des revendications précédentes, caractérisé par le fait que la course du pointeau (9) est faible, de l'ordre de plusieurs millimètres et caractérisé par le fait que la variation des dimensions radiales du moyen (13) élastique d'étanchéité est faible, de l'ordre de plusieurs dixièmes de millimètre.6. Automatic pistol according to any one of the preceding claims, characterized in that the stroke of the needle (9) is small, of the order of several millimeters and characterized in that the variation of the radial dimensions of the means (13) elastic sealing is low, of the order of several tenths of a millimeter.
7. Pistolet automatique selon l'une quelconque des revendications précédentes, caractérisé par le fait que le moyen (13) élastique d'étanchéité présente une conformation en manchon, avec une partie avant (la) renflée radialement intérieurement et une partie arrière (Ib) renflée radialement extérieurement.7. automatic pistol according to any one of the preceding claims, characterized in that the means (13) resilient sealing has a sleeve-shaped, with a front portion (la) bulged radially internally and a rear portion (Ib). bulging radially outwardly.
8. Pistolet automatique selon l'une quelconque des revendications précédentes, caractérisé par le fait que le moyen (13) élastique d'étanchéité est fabriqué en un matériau élastomère perfluoré. 8. Automatic pistol according to any one of the preceding claims, characterized in that the means (13) elastic sealing is made of a perfluoroelastomeric material.
9. Pistolet automatique selon l'une quelconque des revendications précédentes, caractérisé par le fait que des moyens (10, 10a) de commande coopèrent avec un décalage mécanique correspondant à un jeu (j) et assurant l'ouverture du gaz propulseur avant l'ouverture du produit à pulvériser et la fermeture du produit à pulvériser avant la fermeture du gaz propulseur. 9. automatic pistol according to any one of the preceding claims, characterized in that control means (10, 10a) cooperate with a mechanical shift corresponding to a game (j) and ensuring the opening of the propellant gas before the opening the product to be sprayed and closing the product to be sprayed before closing the propellant.
EP07803821A 2006-07-03 2007-06-29 Automatic spray gun Active EP2054161B1 (en)

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FR0606007A FR2903027B1 (en) 2006-07-03 2006-07-03 AUTOMATIC SPRAY GUN
PCT/FR2007/001112 WO2008003850A1 (en) 2006-07-03 2007-06-29 Automatic spray gun

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EP2054161A1 true EP2054161A1 (en) 2009-05-06
EP2054161B1 EP2054161B1 (en) 2012-02-01

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JP (1) JP5181256B2 (en)
CN (1) CN101489685B (en)
AT (1) ATE543574T1 (en)
ES (1) ES2380826T3 (en)
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WO (1) WO2008003850A1 (en)

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Publication number Publication date
ES2380826T3 (en) 2012-05-18
ATE543574T1 (en) 2012-02-15
FR2903027B1 (en) 2008-11-14
WO2008003850A1 (en) 2008-01-10
US8205807B2 (en) 2012-06-26
JP2009541048A (en) 2009-11-26
FR2903027A1 (en) 2008-01-04
EP2054161B1 (en) 2012-02-01
JP5181256B2 (en) 2013-04-10
CN101489685A (en) 2009-07-22
US20090283610A1 (en) 2009-11-19
CN101489685B (en) 2012-05-30

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