EP3318332B1 - Pneumatic spraying assembly, restrictor for such an assembly and installation for projecting a coating product comprising such an assembly or such a restrictor - Google Patents

Pneumatic spraying assembly, restrictor for such an assembly and installation for projecting a coating product comprising such an assembly or such a restrictor Download PDF

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Publication number
EP3318332B1
EP3318332B1 EP17199970.9A EP17199970A EP3318332B1 EP 3318332 B1 EP3318332 B1 EP 3318332B1 EP 17199970 A EP17199970 A EP 17199970A EP 3318332 B1 EP3318332 B1 EP 3318332B1
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EP
European Patent Office
Prior art keywords
restrictor
coating product
sprayer
supply line
pressure
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.)
Active
Application number
EP17199970.9A
Other languages
German (de)
French (fr)
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EP3318332A1 (en
Inventor
Johan Le Cardinal
Thibault Cognon
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
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Exel Industries SA
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Filing date
Publication date
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Publication of EP3318332A1 publication Critical patent/EP3318332A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/004—Arrangements for controlling delivery; Arrangements for controlling the spray area comprising sensors for monitoring the delivery, e.g. by displaying the sensed value or generating an alarm
    • B05B12/006—Pressure or flow rate sensors
    • 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
    • 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
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • 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
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/007—At least a part of the apparatus, e.g. a container, being provided with means, e.g. wheels, for allowing its displacement relative to the ground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material

Definitions

  • the invention relates to a pneumatic spraying assembly for coating product intended for use in a spraying installation for coating product, as well as a restrictor forming a spare part for such an assembly and to an installation for spraying coating product. comprising such a projector and / or such a restrictor.
  • a coating product spraying installation it is known practice to supply one or more manual or automatic projectors with a coating product under pressure, as well as with air for spraying this coating product.
  • a pump capable of delivering both air under pressure and the coating product under pressure.
  • each sprayer can be supplied by a hose of different length and / or diameter.
  • pressure regulators are mounted on the pump or the pump part which delivers the coating product under pressure. The regulators are used to avoid or limit the pressure fluctuations in a coating product supply pipe to the projector and to adjust the pressures in each pipe independently, in order to obtain iso pressure at each projector.
  • Certain coating products such as those used to apply a stain to wood, are very liquid, that is to say have a particularly low viscosity, close to that of water.
  • the supply pressure of the spraying zone of a projector must be low, in particular less than 0.5 bar.
  • a volume provided inside the body of a sprayer to supply this spraying zone must itself be at low pressure. This involves supplying the projector with a coating product at low pressure, which causes the regulator to operate outside its nominal pressure range, to the point that it is no longer efficient and no longer allows hide pump stroke reversals. This results in pressure fluctuations in the feed pipe to the projector, which leads to uneven application of the coating material.
  • the invention more particularly intends to remedy by proposing a new assembly for pneumatic spraying of coating product which makes it possible to supply a spraying zone with a coating product under low pressure, without the risk of operating. a pressure relief valve outside its operating range.
  • the invention relates to an assembly for pneumatic spraying of coating product
  • a pneumatic sprayer of coating product and a line for supplying this pneumatic sprayer from a source of pressurized coating product to which the supply line is connected by its upstream end
  • the pneumatic sprayer comprising a sprayer body and a valve for controlling the flow of the coating product to a spraying zone of this product, this valve itself comprising a needle of 'selective sealing of an outlet of an internal volume of the body of the projector and the projection assembly defining a flow path of the coating product, from the upstream end of the supply line to the internal volume outlet.
  • the flow path includes a feed line connecting member to the projector body, while a coating material flow restrictor is mounted on the coating material flow path to create a waste. load upstream of the outlet.
  • the restrictor is made of a material that is more flexible than the material of the connecting member, in particular of synthetic material.
  • the pressure drop created by the restrictor upstream of the projector makes it possible to maintain a relatively high pressure in the upstream part of the coating product supply line from the projector, while the pressure in the internal volume of the body of the sprayer may be sufficiently low, in particular less than 0.7 bar, to allow low pressure supply to the spraying zone.
  • a pressure regulator arranged at the outlet of a feed pump of the sprayer can be implemented in its nominal operating pressure range, so that it remains effective, even when the pressure of the sprayed coating product. is weak.
  • the fact that the restrictor is made of a material that is softer than the material of the connecting member promotes sealing.
  • the pressures indicated are relative and dynamic pressures, that is to say measured when the coating product circulates in the conduits and supply volume of the spray zone.
  • the invention relates to a restrictor forming a spare part for an assembly as mentioned above.
  • This restrictor is formed by a part which defines at least one calibrated flow conduit for coating product, the length of which is between 1 and 25 mm, preferably between 8 and 15 mm, more preferably of the order of 10 mm. , and whose maximum transverse dimension is less than 2 mm, preferably between 0.5 and 1.8 mm.
  • one end of the restrictor, which defines a mouth thereof is of frustoconical outer and inner shapes, with angles at the top of the same value. This allows the restrictor to take place in a conventional member for connecting the projector with the supply line.
  • the invention relates to a coating product spraying installation which comprises at least one coating product reservoir, at least one pneumatic coating product sprayer, a feed pump for at least one sprayer in coating product from the tank, as well as a supply line to the pneumatic projector from the pump.
  • the pneumatic projector and the supply line form an assembly as mentioned above and / or include a restrictor as mentioned above.
  • the restrictor makes it possible to create a controlled pressure drop and to obtain, within the installation, the same pressure in each projector, while using a single pressure regulator, even in the case where it there are several projectors connected to the same output of the regulator.
  • the pump is equipped, at the outlet, with a pressure regulator set to deliver the coating product to a supply line of the coating product sprayer, at a pressure of between 0.5 and 3 bars, while the pressure restrictor is configured to deliver the coating product to the outlet of the internal volume of the projector body under a pressure less than 1 bar, preferably between 0.3 and 0.7 bar.
  • Installation 2 shown in figure 1 is intended to coat objects O, such as wooden panels transported by a conveyor 4, with a liquid coating product stored in a tank 6.
  • the installation 2 comprises a projector 8 which is here formed by a pneumatic gun, of the “Airspray” type, intended to be handled by an operator.
  • the projector 8 is an automatic pneumatic Airspray type projector intended to be mounted on a support, possibly mobile, and controlled by an automatic device.
  • the installation 2 also comprises a pump 10 connected to the reservoir 6 by a suction tube 12.
  • the pump 10 is, moreover, connected to the projector 8 by a line 14 for supplying this projector with coating product under pressure.
  • a pressure regulator 16 is mounted at the outlet of the pump 10, on the side of the line 14, and makes it possible to regulate the pressure of the coating product circulating in this line, as a function of a set value adjusted by means of a button 18. Note 141 the upstream end of line 14 via which this line is connected to regulator 16.
  • the pump 10 delivers the coating product under a pressure of between 2 and 40 bars.
  • the pressure regulator is constructed so that the setpoint is between 0.5 and 3 bar. In other words, the regulated pressure in the pipe 14 can normally be set between 0.3 and 3 bar.
  • the pump 10 is connected to an air source 20 which may be a source of compressed air.
  • An air suction tube 22 connects the source 20 to the pump 10.
  • the lines 14 and 24 can be formed by flexible pipes.
  • the projector 8 comprises a body 82 on which is mounted a head or cap 84 immobilized by a nut 86, with the interposition of seals 88 and 90.
  • the head 84 is intended to deliver a flat jet and for this purpose comprises two horns, only one of which is visible at the bottom. figure 2 with the references 842.
  • the head is provided with air circulation channels coming from the pipe 24. Some of these channels are visible at figure 2 with the reference 844.
  • the body 82 is, for its part, provided with channels 824 for circulating air from a zone of connection of the pipe 24 on the body 82 and up to the head 84. Only one of these channels is visible at the bottom. figure 2 , it being specified that the number and the representation of the channels 824 and 844 are not limiting any more than their number.
  • the sprayer 8 comprises a valve 92 which makes it possible to control the output of coating product by means of a trigger 94.
  • the valve comprises a needle 96 and a nozzle 98 which defines a seat 981 on which the needle 96 comes into play. support in the closed configuration of the valve 92 shown in figures 2 , 5 and 6 .
  • the nozzle 98 cooperates with a jacket 100 disposed inside the body 2 to define a volume V82 internal to the body 82, which is intended to receive the coating product flowing towards an outlet orifice 982 of the nozzle 98. Downstream of this outlet orifice 982, there is formed a spraying zone Z8 of the sprayer 8 in which the coating product leaving the volume V82 through the orifice 982 is sprayed by the air coming from the channels 844 and shaped by the air coming from channels in the horns 842.
  • a connecting member 102 is mounted on the body 82 such that its internal volume V102 is in communication with the volume 82.
  • the member 102 is screwed onto the body 82.
  • This connecting member 102 is intended for to be connected to the downstream end 142 of the supply pipe 14. It thus constitutes part of an inlet connection for the coating product in the body 82, more particularly in the volume V82.
  • the member 102 is sometimes called “inlet connection”.
  • the connecting member 102 is equipped with an external thread 104 intended to cooperate with a nut 106 mounted to rotate freely around a connecting element 108 provided with a crenellated rod inserted and immobilized by cooperation of shapes in the end. downstream 142 of the supply line 14.
  • the elements 108 and 110 are visible at the figure 6 .
  • the connecting member 102 is provided with a mouth 112 of frustoconical shape converging towards the body 82. Furthermore, the connecting element 108 is provided with a front surface 114 also frustoconical and of geometry complementary to that of the mouthpiece 112.
  • a flow path C of coating material under pressure is defined between the end 141 of the line 14 and the orifice 982.
  • This flow path C comprises the internal volume of the pipe forming the supply line 14, the internal volume V102 of organ 102 and internal volume V82.
  • a restrictor 120 is mounted in the volume V102, that is to say within the flow path C, in order to create a pressure drop on the path of the coating product, upstream of the volume V82.
  • the restrictor 120 is in one piece and has a circular section. Its external surface 122 is complementary to the internal surface 103 of the member 102 which is also of circular section. We denote respectively X102 and X120 of the longitudinal and central axes of the parts 102 and 120.
  • the external surface 122 comprises a frustoconical section 122a of complementary shape to the mouth 112. In particular, the angle at the apex a122 of the section 122a is the same as the apex angle a112 of the mouth 112. This allows a surface support of the section 122a on the mouth 112.
  • the restrictor 120 comprises a downstream end 124 which has the smallest outside diameter of the restrictor 120 and which is intended to be engaged to the bottom of the volume V102 towards the volume V82.
  • the terminal surface 124a of the end 124 is in the form of an annular disc centered on the axis X120 of the restrictor 120 and pierced with an orifice 126 which constitutes the outlet of a calibrated duct 128 of circular section formed in the restrictor 120 and centered on the X120 axis.
  • the surface 124a participates in the limitation of the volume V82.
  • the upstream end of restrictor 120 opposite to the downstream end 124 and which defines a mouth 132 of this restrictor.
  • This mouthpiece is tapered in shape.
  • ⁇ 132 its angle at the top.
  • the angles ⁇ 122 and a132 have the same value.
  • the upstream end 130 of the restrictor 120 is of frustoconical exterior and interior shapes, with a constant thickness along its length except at the level of an end collar 134 which protrudes from the volume V102 in the mounted configuration of the restrictor 120 in the connecting member 102, as shown in figure 5 .
  • angles ⁇ 112, ⁇ 122 and ⁇ 130 can have a value of between 45 and 70 °, preferably equal to 60 °.
  • the restrictor 120 defines an internal volume V120, the diameter of which is denoted d120. This volume V120 forms a chamber for the passage of the coating product between the mouth 132 and the calibrated duct 128.
  • L128 denotes the length of duct 128 measured parallel to the axis X120.
  • the diameter of this duct is denoted by d128.
  • L128 and d128 are selected so as to create a significant pressure drop during the passage of the coating product from the volume V120 to the volume V82.
  • the length L128 is chosen between 1 and 25 mm, preferably between 8 and 15 mm, more preferably of the order of 10 mm, while the diameter d128 is chosen less than 2 mm, preferably between 0, 5 and 1.8 mm.
  • the diameter d128 is strictly less than the diameter d120 and the internal surface 123 of the restrictor 120 comprises a frustoconical section 123b converging towards the mouth 127 of the calibrated duct 128.
  • the frustoconical section 123B has the effect that the cross section of the flow path gradually decreases between that of the pipe forming the line 14, which is substantially equal to that of the interior volume V120, and that of the calibrated duct 128. This avoids creating nooks where the coating product could get stuck.
  • the duct 128 is not of circular section.
  • its maximum transverse dimension is selected as less than 2 mm, preferably between 0.5 and 1.8 mm.
  • its maximum transverse dimension is equal to the diameter d128 of this duct 128.
  • the apex half-angles ⁇ 102 and ⁇ 122 of the surfaces 102b and 122b are equal, with a value between 15 and 30 °, preferably equal to 20 °.
  • the restrictor 120 is made by molding, machining or 3D printing of a synthetic material that is softer than the material constituting the fitting 102.
  • the fitting 102 can be made of steel or brass, while the restrictor 102 is made of elastomer. This allows the restrictor 120 to adapt to the internal shape of the connecting member 102 and to ensure the seal between the parts 102 and 120.
  • the restrictor 120 can be made of metal, for example bronze.
  • the projector is in the configuration of the figure 5 where the outer surface 122 of the restrictor substantially matches the inner shape of the fitting 102, while the flange 134 projects from the volume V102.
  • the member 102 is configured to cooperate with the elements 106 and 108 both in the absence of the restrictor 120 and in the presence of the restrictor 120 in the volume V102.
  • the pressure P82 in the volume 82 can be much lower than the pressure P16 because a significant pressure drop is created by the restriction made up of the calibrated duct 128.
  • the diameter d128 of the duct 128 can be chosen equal to 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm or 1.8 mm, which makes it possible to adapt the pressure P82 to the nature of the coating product to be sprayed, in particular its viscosity.
  • the restrictor 120 constitutes a wearing part which can be mounted reversibly and without tools inside the connecting member 102 and which avoids the areas of retention of the coating product contained in its internal shape, in particular due to the progressive decrease in the passage section due to the frustoconical surface 123b.
  • No tools are required to install restrictor 120 into fitting 102 by pushing it in the direction of arrow F1.
  • a conventional wrench is sufficient to tighten the nut 106 on the connecting member 102.
  • the connecting member 102 can be integral with the body 82 or fixed to the latter other than by screwing.
  • the restrictor 120 can be integrated within the pipe constituting the supply line 14.
  • this restrictor is preferably integrated into the flow path of the coating product in an area close to the outlet orifice 982, that is to say at most near the downstream end 142 of line 14 or within projector 8, as in the two embodiments shown in the figures.
  • the installation of the restrictor 120 in the connection member 102, in the body 82 or elsewhere in the flow path C of the projector 8 therefore makes it possible to maintain a relatively high pressure P16 in a part upstream of the pipe which forms the pipe 14, while the pressure P82 of the coating product at the outlet of the volume V82 and the pressure of this product in the spraying zone Z8 are low and adapted to the viscosity of the sprayed coating product.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Nozzles (AREA)

Description

L'invention concerne un ensemble de projection pneumatique de produit de revêtement destiné à être utilisé dans une installation de projection de produit de revêtement, ainsi qu'un restricteur formant pièce détachée pour un tel ensemble et qu'une installation de projection de produit de revêtement comprenant un tel projecteur et/ou un tel restricteur.The invention relates to a pneumatic spraying assembly for coating product intended for use in a spraying installation for coating product, as well as a restrictor forming a spare part for such an assembly and to an installation for spraying coating product. comprising such a projector and / or such a restrictor.

Dans une installation de projection de produit de revêtement, il est connu d'alimenter un ou plusieurs projecteurs manuel ou automatique avec un produit de revêtement sous pression, ainsi qu'avec de l'air de pulvérisation de ce produit de revêtement. Pour ce faire, il est connu d'utiliser une pompe capable de délivrer à la fois l'air sous pression et le produit de revêtement sous pression. Dans certains cas il y peut y avoir plusieurs pulvérisateurs. Dans ce cas, chaque pulvérisateur peut être alimenté par un tuyau de longueur et/ou de diamètre différent. Dans ce genre d'installation, afin d'avoir le même débit à chaque projecteur, des régulateurs de pression sont montés sur la pompe ou la partie de pompe qui délivre le produit de revêtement sous pression. Les régulateurs sont utilisés pour éviter ou limiter les fluctuations de pression dans un tuyau d'alimentation du projecteur en produit de revêtement et d'ajuster les pressions dans chaque tuyau de façon indépendante, afin d'obtenir une iso pression au niveau de chaque projecteur.In a coating product spraying installation, it is known practice to supply one or more manual or automatic projectors with a coating product under pressure, as well as with air for spraying this coating product. To do this, it is known to use a pump capable of delivering both air under pressure and the coating product under pressure. In some cases there may be more than one sprayer. In this case, each sprayer can be supplied by a hose of different length and / or diameter. In this type of installation, in order to have the same flow rate for each projector, pressure regulators are mounted on the pump or the pump part which delivers the coating product under pressure. The regulators are used to avoid or limit the pressure fluctuations in a coating product supply pipe to the projector and to adjust the pressures in each pipe independently, in order to obtain iso pressure at each projector.

Certains produits de revêtement tels que ceux utilisés pour appliquer une teinte sur du bois, sont très liquides, c'est-à-dire présentent une viscosité particulièrement faible, proche de celle de l'eau. Pour appliquer de tels produits de revêtement, la pression d'alimentation de la zone de pulvérisation d'un projecteur doit être faible notamment inférieure à 0,5 bar. Dans ces conditions, un volume prévu à l'intérieur du corps d'un projecteur pour alimenter cette zone de pulvérisation doit lui-même être à une pression faible. Ceci implique d'alimenter le projecteur avec un produit de revêtement sous faible pression, ce qui amène le régulateur à fonctionner en dehors de sa plage nominale de pression, au point qu'il n'est plus efficace et qu'il ne permet plus de masquer les inversions de course de la pompe. Il en résulte des fluctuations de pression dans le tuyau d'alimentation du projecteur, ce qui conduit à une application irrégulière du produit de revêtement.Certain coating products, such as those used to apply a stain to wood, are very liquid, that is to say have a particularly low viscosity, close to that of water. To apply such coating products, the supply pressure of the spraying zone of a projector must be low, in particular less than 0.5 bar. Under these conditions, a volume provided inside the body of a sprayer to supply this spraying zone must itself be at low pressure. This involves supplying the projector with a coating product at low pressure, which causes the regulator to operate outside its nominal pressure range, to the point that it is no longer efficient and no longer allows hide pump stroke reversals. This results in pressure fluctuations in the feed pipe to the projector, which leads to uneven application of the coating material.

Il est par ailleurs connu de US-A-2 504 117 d'alimenter un projecteur à partir de deux sources de produit de revêtement, en interposant sur chaque ligne d'alimentation on cylindre vissé dans un raccord double taraudé. Ce système est onéreux et complexe à utiliser.It is also known to US-A-2 504 117 to supply a projector from two sources of coating product, by interposing on each supply line a cylinder screwed into a double threaded connection. This system is expensive and complex to use.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un nouvel ensemble de projection pneumatique de produit de revêtement qui permet d'alimenter une zone de pulvérisation avec un produit de revêtement sous faible pression, sans risque de faire fonctionner un limiteur de pression en dehors de sa plage de fonctionnement.It is to these drawbacks that the invention more particularly intends to remedy by proposing a new assembly for pneumatic spraying of coating product which makes it possible to supply a spraying zone with a coating product under low pressure, without the risk of operating. a pressure relief valve outside its operating range.

A cet effet, l'invention concerne un ensemble de projection pneumatique de produit de revêtement comprenant un projecteur pneumatique de produit de revêtement et une ligne d'alimentation de ce projecteur pneumatique à partir d'une source de produit de revêtement sous pression à laquelle la ligne d'alimentation est raccordée par son extrémité amont, le projecteur pneumatique comprenant un corps de projecteur et une vanne de contrôle de l'écoulement du produit de revêtement vers une zone de pulvérisation de ce produit, cette vanne comprenant elle-même un pointeau d'obturation sélective d'un orifice de sortie d'un volume interne du corps du projecteur et l'ensemble de projection définissant un chemin d'écoulement du produit de revêtement, de l'extrémité amont de la ligne d'alimentation jusqu'à l'orifice de sortie du volume interne. Le chemin d'écoulement inclut un organe de raccordement de la ligne d'alimentation sur le corps du projecteur, alors qu'un restricteur d'écoulement du produit de revêtement est monté sur le chemin d'écoulement du produit de revêtement pour créer une perte de charge en amont de l'orifice de sortie. Conformément à l'invention, le restricteur est réalisé dans un matériau plus souple que le matériau de l'organe de raccordement, notamment en matériau synthétique.To this end, the invention relates to an assembly for pneumatic spraying of coating product comprising a pneumatic sprayer of coating product and a line for supplying this pneumatic sprayer from a source of pressurized coating product to which the supply line is connected by its upstream end, the pneumatic sprayer comprising a sprayer body and a valve for controlling the flow of the coating product to a spraying zone of this product, this valve itself comprising a needle of 'selective sealing of an outlet of an internal volume of the body of the projector and the projection assembly defining a flow path of the coating product, from the upstream end of the supply line to the internal volume outlet. The flow path includes a feed line connecting member to the projector body, while a coating material flow restrictor is mounted on the coating material flow path to create a waste. load upstream of the outlet. According to the invention, the restrictor is made of a material that is more flexible than the material of the connecting member, in particular of synthetic material.

Grâce à l'invention, la perte de charge créée par le restricteur en amont du projecteur permet de conserver une pression relativement élevée dans la partie amont de la ligne d'alimentation du projecteur en produit de revêtement, alors que la pression dans le volume interne du corps du projecteur peut être suffisamment basse, notamment inférieure à 0,7 bar, pour permettre une alimentation à basse pression de la zone de pulvérisation. Ainsi, un régulateur de pression disposé en sortie d'une pompe d'alimentation du projecteur peut être mis en œuvre dans sa plage nominale de pression de fonctionnement, de sorte qu'il demeure efficace, alors même que la pression du produit de revêtement pulvérisé est faible. Le fait que le restricteur est réalisé dans un matériau plus souple que le matériau de l'organe de raccordement favorise l'étanchéité.Thanks to the invention, the pressure drop created by the restrictor upstream of the projector makes it possible to maintain a relatively high pressure in the upstream part of the coating product supply line from the projector, while the pressure in the internal volume of the body of the sprayer may be sufficiently low, in particular less than 0.7 bar, to allow low pressure supply to the spraying zone. Thus, a pressure regulator arranged at the outlet of a feed pump of the sprayer can be implemented in its nominal operating pressure range, so that it remains effective, even when the pressure of the sprayed coating product. is weak. The fact that the restrictor is made of a material that is softer than the material of the connecting member promotes sealing.

Dans la présente description et dans les revendications ci jointes, les pressions indiquées sont des pressions relatives et dynamiques, c'est-à-dire mesurées quand le produit de revêtement circule dans les conduits et volume d'alimentation de la zone de pulvérisation.In the present description and in the appended claims, the pressures indicated are relative and dynamic pressures, that is to say measured when the coating product circulates in the conduits and supply volume of the spray zone.

Selon des aspects avantageux mais non obligatoires de l'invention, un tel ensemble peut incorporer une ou plusieurs des caractéristiques suivantes prises dans toute combinaison techniquement admissible :

  • L'organe de raccordement est configuré pour, en l'absence du restricteur, coopérer avec un mécanisme disposé en sortie de la ligne d'alimentation afin de raccorder le projecteur à la ligne d'alimentation, alors que l'organe de raccordement est configuré pour coopérer également avec ce mécanisme lorsque le restricteur est monté dans le raccord d'arrivée du produit.
  • Le restricteur présente une embouchure de même géométrie que la géométrie d'une embouchure de l'organe de raccordement.
  • Le restricteur est monté de façon réversible dans le volume interne du corps du projecteur ou dans l'organe de raccordement.
According to advantageous but not mandatory aspects of the invention, such an assembly can incorporate one or more of the following characteristics taken in any technically admissible combination:
  • The connection member is configured to, in the absence of the restrictor, cooperate with a mechanism arranged at the outlet of the supply line in order to connect the projector to the supply line, while the connection member is configured. to also cooperate with this mechanism when the restrictor is mounted in the product inlet fitting.
  • The restrictor has a mouth of the same geometry as the geometry of a mouth of the connecting member.
  • The restrictor is reversibly mounted in the internal volume of the body of the projector or in the connection member.

Selon un autre aspect, l'invention concerne un restricteur formant pièce détachée pour un ensemble tel que mentionné ci-dessus. Ce restricteur est formé par une pièce qui définit au moins un conduit calibré d'écoulement de produit de revêtement dont la longueur est comprise entre 1 et 25 mm, de préférence entre 8 et 15 mm, de préférence encore de l'ordre de 10 mm, et dont la dimension transversale maximale est inférieure à 2 mm, de préférence comprise entre 0,5 et 1,8 mm. En outre, une extrémité du restricteur, qui en définit une embouchure, est de formes extérieure et intérieure tronconiques, avec des angles au sommet de même valeur. Ceci permet au restricteur de prendre place dans un organe classique de raccordement du projecteur avec la ligne d'alimentation.According to another aspect, the invention relates to a restrictor forming a spare part for an assembly as mentioned above. This restrictor is formed by a part which defines at least one calibrated flow conduit for coating product, the length of which is between 1 and 25 mm, preferably between 8 and 15 mm, more preferably of the order of 10 mm. , and whose maximum transverse dimension is less than 2 mm, preferably between 0.5 and 1.8 mm. In addition, one end of the restrictor, which defines a mouth thereof, is of frustoconical outer and inner shapes, with angles at the top of the same value. This allows the restrictor to take place in a conventional member for connecting the projector with the supply line.

Selon encore un autre aspect, l'invention concerne une installation de projection de produit de revêtement qui comprend au moins un réservoir de produit de revêtement, au moins un projecteur pneumatique de produit de revêtement, une pompe d'alimentation pour au moins un projecteur en produit de revêtement à partir du réservoir, ainsi qu'une ligne d'alimentation du projecteur pneumatique à partir de la pompe. Conformément à l'invention, le projecteur pneumatique et la ligne d'alimentation forment un ensemble tel que mentionné ci-dessus et/ou comprennent un restricteur tel que mentionné ci-dessus.According to yet another aspect, the invention relates to a coating product spraying installation which comprises at least one coating product reservoir, at least one pneumatic coating product sprayer, a feed pump for at least one sprayer in coating product from the tank, as well as a supply line to the pneumatic projector from the pump. In accordance with the invention, the pneumatic projector and the supply line form an assembly as mentioned above and / or include a restrictor as mentioned above.

Grâce à l'invention, le restricteur permet de créer une perte de charge maitrisée et d'obtenir, au sein de l'installation, la même pression dans chaque projecteur, tout en utilisant un seul régulateur de pression, même dans le cas où il y a plusieurs projecteurs branchés sur la même sortie du régulateur.Thanks to the invention, the restrictor makes it possible to create a controlled pressure drop and to obtain, within the installation, the same pressure in each projector, while using a single pressure regulator, even in the case where it there are several projectors connected to the same output of the regulator.

De façon avantageuse, la pompe est équipée, en sortie, d'un régulateur de pression réglé pour délivrer le produit de revêtement à une ligne d'alimentation du projecteur de produit de revêtement, sous une pression comprise entre 0,5 et 3 bars, alors que le restricteur de pression est configuré pour délivrer le produit de revêtement à l'orifice de sortie du volume interne du corps du projecteur sous une pression inférieure à 1 bar, de préférence entre 0,3 et 0,7 bar.Advantageously, the pump is equipped, at the outlet, with a pressure regulator set to deliver the coating product to a supply line of the coating product sprayer, at a pressure of between 0.5 and 3 bars, while the pressure restrictor is configured to deliver the coating product to the outlet of the internal volume of the projector body under a pressure less than 1 bar, preferably between 0.3 and 0.7 bar.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaitront plus clairement à la lumière de la description qui va suivre d'un mode de réalisation d'un ensemble de projection, d'un restricteur et d'une installation de projection de produit de revêtement conformes à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est une représentation schématique en perspective d'une installation de projection de produit de revêtement conforme à l'invention,
  • la figure 2 est une coupe longitudinale de la partie avant d'un projecteur appartenant à un ensemble de projection conforme à l'invention appartenant à l'installation de la figure 1,
  • la figure 3 est une vue de côté d'un restricteur destiné à être utilisé avec le projecteur de la figure 2,
  • la figure 4 est une coupe selon la ligne IV-IV à la figure 3,
  • la figure 5 est une coupe analogue à la figure 2 lorsque le projecteur est équipé du restricteur des figures 3 et 4 et
  • la figure 6 est une coupe analogue aux figures 2 et 5 lorsque le projecteur équipé du restricteur est raccordé à un tuyau d'alimentation en produit de revêtement.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of an embodiment of a projection assembly, of a restrictor and of an installation of. projection of coating product in accordance with its principle, given only by way of example and made with reference to the appended drawings in which:
  • the figure 1 is a schematic perspective representation of a coating product spraying installation according to the invention,
  • the figure 2 is a longitudinal section of the front part of a projector belonging to a projection assembly according to the invention belonging to the installation of the figure 1 ,
  • the figure 3 is a side view of a restrictor intended for use with the projector in the figure 2 ,
  • the figure 4 is a section along line IV-IV at the figure 3 ,
  • the figure 5 is a cut similar to the figure 2 when the projector is equipped with the figures 3 and 4 and
  • the figure 6 is a cut similar to figures 2 and 5 when the projector equipped with the restrictor is connected to a coating product supply pipe.

L'installation 2 représentée à la figure 1 est destinée à revêtir des objets O, tels que des panneaux de bois transportés par un convoyeur 4, avec un produit de revêtement liquide stocké dans un réservoir 6.Installation 2 shown in figure 1 is intended to coat objects O, such as wooden panels transported by a conveyor 4, with a liquid coating product stored in a tank 6.

Pour ce faire, l'installation 2 comprend un projecteur 8 qui est ici formé par un pistolet pneumatique, de type « Airspray », destiné à être manipulé par un opérateur.To do this, the installation 2 comprises a projector 8 which is here formed by a pneumatic gun, of the “Airspray” type, intended to be handled by an operator.

En variante non représentée, le projecteur 8 est un projecteur de type Airspray pneumatique automatique destiné à être monté sur un support, éventuellement mobile, et commandé par un automate.In a variant not shown, the projector 8 is an automatic pneumatic Airspray type projector intended to be mounted on a support, possibly mobile, and controlled by an automatic device.

L'installation 2 comprend également une pompe 10 reliée au réservoir 6 par un tube d'aspiration 12. La pompe 10 est, par ailleurs, reliée au projecteur 8 par une ligne 14 d'alimentation de ce projecteur en produit de revêtement sous pression. Un régulateur de pression 16 est monté en sortie de la pompe 10, du côté de la ligne 14, et permet de réguler la pression du produit de revêtement circulant dans cette ligne, en fonction d'une valeur de consigne réglée au moyen d'un bouton 18. On note 141 l'extrémité amont de la ligne 14 par laquelle cette ligne est raccordée sur le régulateur 16.The installation 2 also comprises a pump 10 connected to the reservoir 6 by a suction tube 12. The pump 10 is, moreover, connected to the projector 8 by a line 14 for supplying this projector with coating product under pressure. A pressure regulator 16 is mounted at the outlet of the pump 10, on the side of the line 14, and makes it possible to regulate the pressure of the coating product circulating in this line, as a function of a set value adjusted by means of a button 18. Note 141 the upstream end of line 14 via which this line is connected to regulator 16.

La pompe 10 délivre le produit de revêtement sous une pression comprise entre 2 et 40 bars. Le régulateur de pression est construit de façon à ce que la valeur de consigne soit comprise entre 0,5 et 3 bars. En d'autres termes, la pression régulée dans le tuyau 14 peut normalement être réglée entre 0,3 et 3 bars.The pump 10 delivers the coating product under a pressure of between 2 and 40 bars. The pressure regulator is constructed so that the setpoint is between 0.5 and 3 bar. In other words, the regulated pressure in the pipe 14 can normally be set between 0.3 and 3 bar.

Par ailleurs, la pompe 10 est reliée à une source d'air 20 qui peut être une source d'air comprimé. Un tube d'aspiration d'air 22 relie la source 20 à la pompe 10.Furthermore, the pump 10 is connected to an air source 20 which may be a source of compressed air. An air suction tube 22 connects the source 20 to the pump 10.

Une ligne 24 d'alimentation du projecteur 8 en air relie la pompe 10 au projecteur 8. Un régulateur 26 est monté en sortie de la pompe 10, au départ de la ligne 24, et permet de régler la pression d'air dans ce tuyau 24 au moyen d'un bouton de commande 28.A line 24 for supplying the projector 8 with air connects the pump 10 to the projector 8. A regulator 26 is mounted at the outlet of the pump 10, at the start of the line 24, and makes it possible to adjust the air pressure in this pipe. 24 by means of a control button 28.

En pratique, dans le cas représenté du projecteur 8 de type pistolet, les lignes 14 et 24 peuvent être formées par des tuyaux souples.In practice, in the case shown of the sprayer 8 of the gun type, the lines 14 and 24 can be formed by flexible pipes.

Comme visible notamment à la figure 2, le projecteur 8 comprend un corps 82 sur lequel est montée une tête ou chapeau 84 immobilisée par un écrou 86, avec interposition de joints d'étanchéité 88 et 90.As visible in particular at the figure 2 , the projector 8 comprises a body 82 on which is mounted a head or cap 84 immobilized by a nut 86, with the interposition of seals 88 and 90.

Dans l'exemple, la tête 84 est destinée à délivrer un jet plat et comprend à cet effet deux cornes, dont une seule est visible à la figure 2 avec les références 842. La tête est pourvue de canaux de circulation d'air provenant du tuyau 24. Certains de ces canaux sont visibles à la figure 2 avec la référence 844.In the example, the head 84 is intended to deliver a flat jet and for this purpose comprises two horns, only one of which is visible at the bottom. figure 2 with the references 842. The head is provided with air circulation channels coming from the pipe 24. Some of these channels are visible at figure 2 with the reference 844.

Le corps 82 est, quant à lui, pourvu de canaux 824 de circulation d'air à partir d'une zone de raccordement du tuyau 24 sur le corps 82 et jusque dans la tête 84. Un seul de ces canaux est visible à la figure 2, étant précisé que le nombre et la représentation des canaux 824 et 844 ne sont pas limitatifs pas plus que leur nombre.The body 82 is, for its part, provided with channels 824 for circulating air from a zone of connection of the pipe 24 on the body 82 and up to the head 84. Only one of these channels is visible at the bottom. figure 2 , it being specified that the number and the representation of the channels 824 and 844 are not limiting any more than their number.

Par ailleurs, le pulvérisateur 8 comprend une vanne 92 qui permet de contrôler la sortie de produit de revêtement au moyen d'une gâchette 94. La vanne comprend un pointeau 96 et une buse 98 qui définit un siège 981 sur lequel le pointeau 96 vient en appui en configuration fermée de la vanne 92 représentée aux figures 2, 5 et 6.Furthermore, the sprayer 8 comprises a valve 92 which makes it possible to control the output of coating product by means of a trigger 94. The valve comprises a needle 96 and a nozzle 98 which defines a seat 981 on which the needle 96 comes into play. support in the closed configuration of the valve 92 shown in figures 2 , 5 and 6 .

La buse 98 coopère avec une chemise 100 disposé à l'intérieur du corps 2 pour définir un volume V82 interne au corps 82, qui est destiné à recevoir le produit de revêtement s'écoulant vers un orifice de sortie 982 de la buse 98.. En aval de cet orifice de sortie 982, il est formé une zone de pulvérisation Z8 du projecteur 8 dans laquelle le produit de revêtement sortant du volume V82 par l'orifice 982 est pulvérisé par l'air provenant des canaux 844 et conformé par l'air provenant des canaux ménagés dans les cornes 842.The nozzle 98 cooperates with a jacket 100 disposed inside the body 2 to define a volume V82 internal to the body 82, which is intended to receive the coating product flowing towards an outlet orifice 982 of the nozzle 98. Downstream of this outlet orifice 982, there is formed a spraying zone Z8 of the sprayer 8 in which the coating product leaving the volume V82 through the orifice 982 is sprayed by the air coming from the channels 844 and shaped by the air coming from channels in the horns 842.

Un organe de raccordement 102 est monté sur le corps 82 de telle façon que son volume intérieur V102 est en communication avec le volume 82. Dans l'exemple, l'organe 102 est vissé sur le corps 82. Cet organe de raccordement 102 est destiné à être raccordé à l'extrémité aval 142 de la conduite d'alimentation 14. Il constitue ainsi une partie d'un raccord d'arrivée du produit de revêtement dans le corps 82, plus particulièrement dans le volume V82. On appelle parfois l'organe 102 « raccord d'arrivée ».A connecting member 102 is mounted on the body 82 such that its internal volume V102 is in communication with the volume 82. In the example, the member 102 is screwed onto the body 82. This connecting member 102 is intended for to be connected to the downstream end 142 of the supply pipe 14. It thus constitutes part of an inlet connection for the coating product in the body 82, more particularly in the volume V82. The member 102 is sometimes called “inlet connection”.

L'organe de raccordement 102 est équipé d'un filetage externe 104 destiné à coopérer avec un écrou 106 monté libre en rotation autour d'un élément de raccord 108 pourvu d'une tige crénelée introduite et immobilisée par coopération de formes dans l'extrémité aval 142 de la conduite d'alimentation 14. Les éléments 108 et 110 sont visibles à la figure 6.The connecting member 102 is equipped with an external thread 104 intended to cooperate with a nut 106 mounted to rotate freely around a connecting element 108 provided with a crenellated rod inserted and immobilized by cooperation of shapes in the end. downstream 142 of the supply line 14. The elements 108 and 110 are visible at the figure 6 .

L'organe de raccord 102 est pourvu d'une embouchure 112 de forme tronconique convergente en direction du corps 82. Par ailleurs, l'élément de raccord 108 est pourvu d'une surface avant 114 également tronconique et de géométrie complémentaire de celle de l'embouchure 112.The connecting member 102 is provided with a mouth 112 of frustoconical shape converging towards the body 82. Furthermore, the connecting element 108 is provided with a front surface 114 also frustoconical and of geometry complementary to that of the mouthpiece 112.

Il est ainsi possible de raccorder fluidiquement l'organe 102 et l'élément 108 en mettant en appui la surface 114 sur l'embouchure 112 et en vissant l'écrou 106 sur le filetage 104. Cette configuration n'est pas représentée sur les figures mais se déduit de la géométrie des pièces 102, 106 et 108. L'organe 102 et l'élément 108 forment donc deux parties d'un raccord d'alimentation du projecteur 8 en produit de revêtement.It is thus possible to fluidly connect the member 102 and the element 108 by resting the surface 114 on the mouth 112 and by screwing the nut 106 on the thread 104. This configuration is not shown in the figures. but is deduced from the geometry of the parts 102, 106 and 108. The member 102 and the element 108 therefore form two parts of a connection for supplying the projector 8 with coating product.

Un chemin d'écoulement C de produit de revêtement sous pression est défini entre l'extrémité 141 de la ligne 14 et l'orifice 982. Ce chemin d'écoulement C comprend le volume interne du tuyau formant la ligne d'alimentation 14, le volume interne V102 de l'organe 102 et le volume interne V82.A flow path C of coating material under pressure is defined between the end 141 of the line 14 and the orifice 982. This flow path C comprises the internal volume of the pipe forming the supply line 14, the internal volume V102 of organ 102 and internal volume V82.

Conformément à l'invention, un restricteur 120 est monté dans le volume V102, c'est-à-dire au sein du chemin d'écoulement C, afin de créer une perte de charge sur le trajet du produit de revêtement, en amont du volume V82.According to the invention, a restrictor 120 is mounted in the volume V102, that is to say within the flow path C, in order to create a pressure drop on the path of the coating product, upstream of the volume V82.

Le restricteur 120 est monobloc et à section circulaire. Sa surface externe 122 est complémentaire de la surface interne 103 de l'organe 102 qui est également à section circulaire. On note respectivement X102 et X120 des axes longitudinaux et centraux des pièces 102 et 120. La surface externe 122 comprend une section tronconique 122a de forme complémentaire de l'embouchure 112. En particulier, l'angle au sommet a122 de la section 122a est le même que l'angle au sommet a112 de l'embouchure 112. Ceci permet un appui surfacique de la section 122a sur l'embouchure 112.The restrictor 120 is in one piece and has a circular section. Its external surface 122 is complementary to the internal surface 103 of the member 102 which is also of circular section. We denote respectively X102 and X120 of the longitudinal and central axes of the parts 102 and 120. The external surface 122 comprises a frustoconical section 122a of complementary shape to the mouth 112. In particular, the angle at the apex a122 of the section 122a is the same as the apex angle a112 of the mouth 112. This allows a surface support of the section 122a on the mouth 112.

Le restricteur 120 comprend une extrémité aval 124 qui présente le plus petit diamètre extérieur du restricteur 120 et qui est destinée à être engagée jusqu'au fond du volume V102 en direction du volume V82. La surface terminale 124a de l'extrémité 124 est en forme de disque annulaire centré sur l'axe X120 du restricteur 120 et percée d'un orifice 126 qui constitue le débouché d'un conduit calibré 128 à section circulaire ménagé dans le restricteur 120 et centré sur l'axe X120. La surface 124a participe à la limitation du volume V82.The restrictor 120 comprises a downstream end 124 which has the smallest outside diameter of the restrictor 120 and which is intended to be engaged to the bottom of the volume V102 towards the volume V82. The terminal surface 124a of the end 124 is in the form of an annular disc centered on the axis X120 of the restrictor 120 and pierced with an orifice 126 which constitutes the outlet of a calibrated duct 128 of circular section formed in the restrictor 120 and centered on the X120 axis. The surface 124a participates in the limitation of the volume V82.

On note 130 l'extrémité amont du restricteur 120, opposée à l'extrémité aval 124 et qui définit une embouchure 132 de ce restricteur. Cette embouchure est de forme tronconique. On note α132 son angle au sommet. Les angles α122 et a132 ont la même valeur. En d'autres termes, l'extrémité amont 130 du restricteur 120 est de formes extérieure et intérieure tronconiques, avec une épaisseur constante sur sa longueur sauf au niveau d'une collerette terminale 134 qui dépasse du volume V102 en configuration montée du restricteur 120 dans l'organe de raccordement 102, comme représenté à la figure 5.Note 130 the upstream end of restrictor 120, opposite to the downstream end 124 and which defines a mouth 132 of this restrictor. This mouthpiece is tapered in shape. We denote by α132 its angle at the top. The angles α122 and a132 have the same value. In other words, the upstream end 130 of the restrictor 120 is of frustoconical exterior and interior shapes, with a constant thickness along its length except at the level of an end collar 134 which protrudes from the volume V102 in the mounted configuration of the restrictor 120 in the connecting member 102, as shown in figure 5 .

En pratique, les angles α112, α122 et α130 peuvent avoir une valeur comprise entre 45 et 70°, de préférence égale à 60°.In practice, the angles α112, α122 and α130 can have a value of between 45 and 70 °, preferably equal to 60 °.

Entre l'embouchure 132 et le conduit 128, le long de l'axe X120, le restricteur 120 définit un volume intérieur V120 dont on note d120 le diamètre. Ce volume V120 forme une chambre de passage du produit de revêtement entre l'embouchure 132 et le conduit calibré 128.Between the mouth 132 and the duct 128, along the axis X120, the restrictor 120 defines an internal volume V120, the diameter of which is denoted d120. This volume V120 forms a chamber for the passage of the coating product between the mouth 132 and the calibrated duct 128.

On note L128 la longueur du conduit 128 mesurée parallèlement à l'axe X120. On note d128 le diamètre de ce conduit.L128 denotes the length of duct 128 measured parallel to the axis X120. The diameter of this duct is denoted by d128.

Ces dimensions L128 et d128 sont sélectionnées de façon à créer une perte de charge significative lors du passage du produit de revêtement du volume V120 vers le volume V82.These dimensions L128 and d128 are selected so as to create a significant pressure drop during the passage of the coating product from the volume V120 to the volume V82.

En pratique, la longueur L128 est choisie entre 1 et 25 mm, de préférence entre 8 et 15 mm, de préférence encore de l'ordre de 10 mm, alors que le diamètre d128 est choisi inférieur à 2 mm, de préférence entre 0,5 et 1,8 mm. Le diamètre d128 est strictement inférieur au diamètre d120 et la surface interne 123 du restricteur 120 comprend une section tronconique 123b convergente en direction de l'embouchure 127 du conduit calibré 128.In practice, the length L128 is chosen between 1 and 25 mm, preferably between 8 and 15 mm, more preferably of the order of 10 mm, while the diameter d128 is chosen less than 2 mm, preferably between 0, 5 and 1.8 mm. The diameter d128 is strictly less than the diameter d120 and the internal surface 123 of the restrictor 120 comprises a frustoconical section 123b converging towards the mouth 127 of the calibrated duct 128.

Dans l'exemple, la section tronconique 123B a pour effet que la section transversale du chemin d'écoulement décroit progressivement entre celle du tuyau formant la ligne 14, qui est sensiblement égale à celle du volume intérieur V120, et celle du conduit calibré 128. Ceci évite de créer des recoins où le produit de revêtement pourrait se bloquer.In the example, the frustoconical section 123B has the effect that the cross section of the flow path gradually decreases between that of the pipe forming the line 14, which is substantially equal to that of the interior volume V120, and that of the calibrated duct 128. This avoids creating nooks where the coating product could get stuck.

En variante, le conduit 128 n'est pas à section circulaire. Dans ce cas, on sélectionne sa dimension transversale maximale comme inférieure à 2 mm, de préférence comprise entre 0,5 et 1,8 mm. Dans le cas d'un conduit à section circulaire, sa dimension transversale maximale est égale au diamètre d128 de ce conduit 128.As a variant, the duct 128 is not of circular section. In this case, its maximum transverse dimension is selected as less than 2 mm, preferably between 0.5 and 1.8 mm. In the case of a duct with a circular section, its maximum transverse dimension is equal to the diameter d128 of this duct 128.

Pour installer le restricteur 120 dans le raccord d'arrivée 102, il suffit d'aligner les axes X120 et X102 du volume V102 et de pousser le restricteur 120 vers le volume V82 dans un sens d'enfoncement à l'intérieur du raccord 102, représenté par la flèche F1 à la figure 5, jusqu'à faire parvenir une deuxième section tronconique 122b de la surface 122 ainsi que la section 122a respectivement en appui surfacique sur une section tronconique 102b de la surface interne du raccord 102 et contre l'embouchure 112.To install the restrictor 120 in the inlet fitting 102, it suffices to align the axes X120 and X102 of the volume V102 and push the restrictor 120 towards the volume V82 in a direction of insertion inside the fitting 102, represented by the arrow F1 at the figure 5 , until a second frustoconical section 122b reaches the surface 122 as well as the section 122a respectively in surface bearing on a frustoconical section 102b of the internal surface of the connector 102 and against the mouth 112.

Les demi-angles au sommet β102 et β122 des surfaces 102b et 122b sont égaux, avec une valeur comprise entre 15 et 30°, de préférence égale à 20°.The apex half-angles β102 and β122 of the surfaces 102b and 122b are equal, with a value between 15 and 30 °, preferably equal to 20 °.

En pratique, le restricteur 120 est réalisé par moulage, usinage ou impression 3D d'un matériau synthétique plus souple que le matériau constitutif du raccord 102. Par exemple, le raccord 102 peut être réalisé en acier ou en laiton, alors que le restricteur 102 est réalisé en élastomère. Ceci permet au restricteur 120 de s'adapter à la forme intérieure de l'organe de raccordement 102 et d'assurer l'étanchéité entre les pièces 102 et 120.In practice, the restrictor 120 is made by molding, machining or 3D printing of a synthetic material that is softer than the material constituting the fitting 102. For example, the fitting 102 can be made of steel or brass, while the restrictor 102 is made of elastomer. This allows the restrictor 120 to adapt to the internal shape of the connecting member 102 and to ensure the seal between the parts 102 and 120.

En variante, le restricteur 120 peut être réalisé en métal, par exemple en bronze.As a variant, the restrictor 120 can be made of metal, for example bronze.

Au terme de l'introduction du restricteur 120 dans l'organe de raccordement 102, le projecteur est dans la configuration de la figure 5 où la surface externe 122 du restricteur épouse sensiblement la forme intérieure du raccord 102, alors que la collerette 134 dépasse du volume V102.At the end of the introduction of the restrictor 120 into the connection member 102, the projector is in the configuration of the figure 5 where the outer surface 122 of the restrictor substantially matches the inner shape of the fitting 102, while the flange 134 projects from the volume V102.

Il est alors possible de raccorder le tuyau 14 sur le projecteur 8 en introduisant la surface avant 114 de l'élément de raccord 108 dans l'embouchure 132 du restricteur 120, puis en vissant l'écrou 106 sur le filetage 104 de l'organe de raccordement 102. Ceci a pour effet de comprimer l'extrémité amont 130 du restricteur 120 entre l'embouchure 112 et la surface 114, ce qui assure une bonne étanchéité à l'interface entre l'organe 102 et l'élément 108. Dans ce cas, la longueur de prise entre le taraudage interne de l'écrou 106 et le filetage 104 est inférieure à la longueur de prise entre ce taraudage et ce filetage en l'absence du restricteur 120.It is then possible to connect the pipe 14 to the projector 8 by inserting the front surface 114 of the connecting element 108 into the mouth 132 of the restrictor 120, then by screwing the nut 106 onto the thread 104 of the member. connection 102. This has the effect of compressing the upstream end 130 of the restrictor 120 between the mouth 112 and the surface 114, which ensures a good seal at the interface between the member 102 and the element 108. In In this case, the engagement length between the internal thread of the nut 106 and the thread 104 is less than the engagement length between this internal thread and this thread in the absence of the restrictor 120.

Ainsi, l'organe 102 est configuré pour coopérer avec les éléments 106 et 108 à la fois en l'absence du restricteur 120 et en présence du restricteur 120 dans le volume V102.Thus, the member 102 is configured to cooperate with the elements 106 and 108 both in the absence of the restrictor 120 and in the presence of the restrictor 120 in the volume V102.

Dans la configuration de la figure 6, la pression dans le tuyau 14 et jusque dans le volume V120 est sensiblement égale à la pression P16 régulée par le régulateur 16, en considérant comme négligeables les pertes de charge dans la ligne d'alimentation 14.In the configuration of the figure 6 , the pressure in the pipe 14 and up to the volume V120 is substantially equal to the pressure P16 regulated by the regulator 16, considering the pressure drops in the supply line 14 as negligible.

La pression P82 dans le volume 82 peut être largement inférieure à la pression P16 car une perte de charge significative est créée par la restriction constituée du conduit calibré 128.The pressure P82 in the volume 82 can be much lower than the pressure P16 because a significant pressure drop is created by the restriction made up of the calibrated duct 128.

En pratique, le diamètre d128 du conduit 128 peut être choisi égal à 0,8 mm, 0,9 mm, 1 mm, 1,2 mm, 1,4 mm ou 1,8 mm, ce qui permet d'adapter la pression P82 à la nature du produit de revêtement qui doit être projeté, en particulier à sa viscosité.In practice, the diameter d128 of the duct 128 can be chosen equal to 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm or 1.8 mm, which makes it possible to adapt the pressure P82 to the nature of the coating product to be sprayed, in particular its viscosity.

L'utilisation du restricteur 120 permet que la pression P82 soit inférieure à 1 bar, par exemple entre 0,3 et 0,7 bars, alors que la pression P16 est comprise entre 0,5 et 3 bars.The use of the restrictor 120 allows the pressure P82 to be less than 1 bar, for example between 0.3 and 0.7 bars, while the pressure P16 is between 0.5 and 3 bars.

En pratique, le restricteur 120 constitue une pièce d'usure qui peut être montée de façon réversible et sans outil à l'intérieur de l'organe de raccordement 102 et qui évite les zones de rétention de produit de revêtement contenu de sa forme intérieure, notamment du fait de la décroissance progressive de la section de passage due à la surface tronconique 123b. Aucun outil n'est nécessaire pour installer le restricteur 120 dans le raccord 102 en le poussant dans le sens de la flèche F1. Il suffit d'une clé classique pour serrer l'écrou 106 sur l'organe de raccordement 102. Lorsqu'il convient de démonter le restricteur 120, il suffit de desserrer l'écrou 106 avec une clé, puis de tirer sur la collerette 134 parallèlement à l'axe X102, dans un sens d'éloignement par rapport au corps 82 inverse de celui de la flèche F1. Il est donc facile d'adapter la perte de charge créée par le restricteur 120, c'est-à-dire la pression P82 au sein du volume V82, en installant dans le volume V102 un restricteur 120 dont le conduit 128 présente une longueur et une dimension transversale maximale adaptées.In practice, the restrictor 120 constitutes a wearing part which can be mounted reversibly and without tools inside the connecting member 102 and which avoids the areas of retention of the coating product contained in its internal shape, in particular due to the progressive decrease in the passage section due to the frustoconical surface 123b. No tools are required to install restrictor 120 into fitting 102 by pushing it in the direction of arrow F1. A conventional wrench is sufficient to tighten the nut 106 on the connecting member 102. When it is necessary to disassemble the restrictor 120, it is sufficient to loosen the nut 106 with a wrench, then to pull on the collar 134 parallel to the axis X102, in a direction away from the body 82 opposite to that of the arrow F1. It is therefore easy to adapt the pressure drop created by the restrictor 120, that is to say the pressure P82 within the volume V82, by installing in the volume V102 a restrictor 120 whose duct 128 has a length and a maximum transverse dimension adapted.

Selon une variante non représentée de l'invention, l'organe de raccordement 102 peut être monobloc avec le corps 82 ou fixé sur celui-ci autrement que par vissage.According to a variant of the invention that is not shown, the connecting member 102 can be integral with the body 82 or fixed to the latter other than by screwing.

Selon un autre mode de réalisation non représenté de l'invention, le restricteur 120 peut être intégré au sein du tuyau constituant la ligne d'alimentation 14.According to another embodiment of the invention, not shown, the restrictor 120 can be integrated within the pipe constituting the supply line 14.

Toutefois, ce restricteur est de préférence intégré au chemin d'écoulement du produit de revêtement dans une zone proche de l'orifice de sortie 982, c'est-à-dire au plus près de l'extrémité aval 142 de la ligne 14 ou au sein du projecteur 8, comme dans les deux modes de réalisation représentés sur les figures.However, this restrictor is preferably integrated into the flow path of the coating product in an area close to the outlet orifice 982, that is to say at most near the downstream end 142 of line 14 or within projector 8, as in the two embodiments shown in the figures.

Quel que soit le mode de réalisation, l'installation du restricteur 120 dans l'organe de raccordement 102, dans le corps 82 ou ailleurs dans le chemin d'écoulement C du projecteur 8 permet donc de maintenir une pression relativement élevée P16 dans une partie amont du tuyau qui forme la conduite 14, alors que la pression P82 du produit de revêtement en sortie du volume V82 et la pression de ce produit dans la zone de pulvérisation Z8 sont faibles et adaptées à la viscosité du produit de revêtement projeté.Whatever the embodiment, the installation of the restrictor 120 in the connection member 102, in the body 82 or elsewhere in the flow path C of the projector 8 therefore makes it possible to maintain a relatively high pressure P16 in a part upstream of the pipe which forms the pipe 14, while the pressure P82 of the coating product at the outlet of the volume V82 and the pressure of this product in the spraying zone Z8 are low and adapted to the viscosity of the sprayed coating product.

Ceci autorise l'alimentation de plusieurs projecteurs 8 à partir d'une même pompe 10 et sous une même pression, ce qui s'avère tout à fait avantageux en pratique, à la fois en termes d'encombrement, en termes de coût et en termes de maintenance.This allows the supply of several projectors 8 from the same pump 10 and under the same pressure, which turns out to be quite advantageous in practice, both in terms of size, in terms of cost and in terms of terms of maintenance.

Selon une variante non représentée de l'invention, celle-ci peut être mise en œuvre avec un projecteur électrostatique.According to a variant of the invention not shown, it can be implemented with an electrostatic projector.

Les modes de réalisation et les variantes envisagés ci-dessus peuvent être combinés entre eux pour générer de nouveaux modes de réalisation de l'invention.The embodiments and the variants considered above can be combined with one another to generate new embodiments of the invention.

Claims (8)

  1. A pneumatic spraying assembly for a coating product comprising a pneumatic coating product sprayer (8) and a supply line (14) for this pneumatic sprayer from a pressurized coating product source (10-16) to which the supply line is connected by its upstream end (141), the pneumatic sprayer comprising a sprayer body (82) and a control valve (92) for the flow of the coating product toward a spraying area (Z8) of this product, this valve in turn comprising a needle (96) selectively closing off an outlet orifice (982) of an inner volume (V82) of the body of the sprayer and the spraying assembly defining a flow path (C) for the coating product, from the upstream end (141) of the supply line (14) to the outlet orifice (982) of the inner volume (82), the flow path including a member (102) connecting the supply line (14) on the body (82) of the sprayer, whereas a flow restrictor (120) for the coating product is mounted on the flow path (C) of the coating product, in the connecting member, to create a pressure loss upstream from the outlet orifice (982), characterized in that the restrictor (120) is made from a material more flexible than the material of the coupling member (102), in particular a synthetic material.
  2. The assembly according to claim 1, characterized in that the connecting member (102) is configured so as, in the absence of the restrictor (120), to cooperate with a mechanism (106, 108) arranged at the outlet of the supply line (14) in order to connect the sprayer (8) to the supply line, and in that the connecting member (102) is configured also to cooperate with this mechanism (106, 108) when the restrictor (120) is mounted in the intake coupling of the product.
  3. The assembly according to claim 2, characterized in that the restrictor (120) has a mouth (132) with the same geometry (α132) as the geometry (α112) of a mouth (112) of the coupling member (102).
  4. The assembly according to one of the preceding claims, characterized in that the restrictor (120) is mounted reversibly in the inner volume (V82) or in the coupling member (102).
  5. The assembly according to one of the preceding claims, characterized in that the cross-section of the flow path (C) decreases gradually between that of a portion (14) situated upstream from the restrictor (120) and that of a calibrated pipe (128) formed by the restrictor.
  6. A restrictor forming a spare part for a pneumatic sprayer according to one of the preceding claims, characterized in that it is formed by a part that defines at least one calibrated pipe (128) for the flow of coating product having a length (L128) comprised between 1 and 25 mm, preferably between 8 and 15 mm, still more preferably about 10 mm, and the maximum transverse dimension (d128; e128) of which is less than 2 mm, preferably comprised between 0.5 and 1.8 mm and in that one end (130) of the restrictor (120), which defines a mouth (132) thereof, has frustoconical outer and inner shapes with apical angles (α122, a132) having the same value.
  7. An installation (2) for spraying a coating product, comprising at least:
    - at least one coating product reservoir (6),
    - at least one pneumatic coating product sprayer (8),
    - a supply pump (10) for supplying at least one sprayer with coating product from the reservoir, and
    - a supply line (14) supplying the pneumatic sprayer from the pump,
    characterized in that the pneumatic sprayer (8) and the supply line for an assembly according to one of claims 1 to 5, and/or comprise a restrictor (120) according to claim 6.
  8. The installation according to claim 7, characterized in that the pump (10) is equipped, at its outlet, with a pressure regulator (16) adjusted to deliver the coating product to the supply line (14), under a pressure (P16) comprised between 0.5 and 3 bars, and in that the pressure restrictor (120) is configured to deliver the coating product to the outlet orifice (982) under a pressure (P82) below 1 bar, preferably between 0.3 and 0.7 bars.
EP17199970.9A 2016-11-04 2017-11-03 Pneumatic spraying assembly, restrictor for such an assembly and installation for projecting a coating product comprising such an assembly or such a restrictor Active EP3318332B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1660689A FR3058331B1 (en) 2016-11-04 2016-11-04 PNEUMATIC SPRAYING ASSEMBLY, RESTRICTOR FOR SUCH ASSEMBLY AND COATING PRODUCT SPRAYING INSTALLATION COMPRISING SUCH ASSEMBLY OR SUCH RESTRICTOR

Publications (2)

Publication Number Publication Date
EP3318332A1 EP3318332A1 (en) 2018-05-09
EP3318332B1 true EP3318332B1 (en) 2020-09-16

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Application Number Title Priority Date Filing Date
EP17199970.9A Active EP3318332B1 (en) 2016-11-04 2017-11-03 Pneumatic spraying assembly, restrictor for such an assembly and installation for projecting a coating product comprising such an assembly or such a restrictor

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Country Link
US (1) US10315207B2 (en)
EP (1) EP3318332B1 (en)
JP (1) JP7114238B2 (en)
KR (1) KR102447021B1 (en)
CN (1) CN108014940B (en)
BR (1) BR102017023557A2 (en)
ES (1) ES2829327T3 (en)
FR (1) FR3058331B1 (en)
RU (1) RU2753345C2 (en)

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Publication number Priority date Publication date Assignee Title
DE102020002351A1 (en) * 2020-04-19 2021-10-21 Exel Industries Sa Print head with micro-pneumatic control unit

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Publication number Publication date
JP7114238B2 (en) 2022-08-08
FR3058331A1 (en) 2018-05-11
CN108014940A (en) 2018-05-11
EP3318332A1 (en) 2018-05-09
RU2753345C2 (en) 2021-08-13
BR102017023557A2 (en) 2018-05-29
US20180126397A1 (en) 2018-05-10
CN108014940B (en) 2021-05-28
KR20180050242A (en) 2018-05-14
US10315207B2 (en) 2019-06-11
ES2829327T3 (en) 2021-05-31
RU2017138269A3 (en) 2021-02-19
JP2018069238A (en) 2018-05-10
RU2017138269A (en) 2019-05-06
FR3058331B1 (en) 2023-05-19
KR102447021B1 (en) 2022-09-23

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