EP2424677A1 - Dispositif et procede de pulverisation - Google Patents
Dispositif et procede de pulverisationInfo
- Publication number
- EP2424677A1 EP2424677A1 EP10723724A EP10723724A EP2424677A1 EP 2424677 A1 EP2424677 A1 EP 2424677A1 EP 10723724 A EP10723724 A EP 10723724A EP 10723724 A EP10723724 A EP 10723724A EP 2424677 A1 EP2424677 A1 EP 2424677A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- tube
- powder
- tunnels
- deflector
- 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.)
- Withdrawn
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
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
-
- 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
- B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
- B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
- B05B1/265—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being symmetrically deflected about the axis of the nozzle
-
- 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
- B05B1/28—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with integral means for shielding the discharged liquid or other fluent material, e.g. to limit area of spray; with integral means for catching drips or collecting surplus 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
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
- B05B12/1472—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet separate supply lines supplying different materials to separate outlets of the spraying apparatus
-
- 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
- B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
- B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
- B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
-
- 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
- B05B7/10—Spray pistols; Apparatus for discharge producing a swirling 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
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
- B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1481—Spray pistols or apparatus for discharging particulate material
- B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
- B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/14—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying for coating elongate material
- C23C4/16—Wires; Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/001—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means incorporating means for heating or cooling, e.g. the material to be sprayed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
- B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/12—Plant for applying liquids or other fluent materials to objects specially adapted for coating the interior of hollow bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/16—Arrangements for supplying liquids or other fluent material
- B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
Definitions
- the present invention relates to the field of high-speed spraying of pulverulent products, in order to produce coatings for objects, in particular metal objects.
- the present invention relates to a spray nozzle, to a spray device comprising such a nozzle, and to a spraying process involving such a device.
- Spraying techniques are also known. They advantageously make it possible to independently treat each wall of a tube. For example, it is possible to cover only the inner wall of said tube.
- electrostatic powdering the powder is charged with static electricity by passing it through a gun made of a suitable material.
- This is particularly the phenomenon of triboelectrification, which corresponds to an electron transfer between two surfaces contacted, said surfaces being formed of different types of materials.
- the powder thus charged is then projected onto the object to be covered, this object being connected to a zero potential.
- a layer of powder is formed on the object, said layer being maintained by the triboelectric charges.
- the coated object is then placed in an oven at a temperature above the melting temperature of the powder. The filming of said powder then forms a homogeneous coating.
- hot dusting Another technique, known as hot dusting, consists of heating the object to be coated at a temperature above the melting temperature of the powder. The powder is then sprayed on the object, melts immediately on contact and films.
- the spraying devices described in these documents comprise a spray nozzle.
- This nozzle has the function of forming a jet of powder mixed with a fluid, said fluid being most often compressed air.
- the configuration of the spray nozzle is a determining factor for the shape of the powder jet. Said form of the powder jet influences the characteristics of the coating layer, in particular the homogeneity and the thickness of said layer.
- FR2185938 describes for example a nozzle for obtaining a fan-shaped flat stream.
- This form of jet has particular interest for the recovery of parts with elongated recesses.
- This form of jet in two dimensions, is however not suitable for spraying the inside of a cylindrical tube.
- This type of surface requires a projection in three dimensions.
- US5173327 discloses a nozzle for obtaining a conical shaped jet, adapted to the coating of the inside of a tube.
- This nozzle comprises a feed channel connected to a plurality of outlet pipes arranged in a cone.
- This type of configuration induces pressure differences along the path of the powder, these differences may cause an irregularity of the jet.
- the powder flow rate is limited by the diameter of the single feed channel.
- An object of the invention is indeed a spray nozzle for powdery solid products intended for coating objects, said nozzle comprising a body of substantially cylindrical shape, characterized in that the body is traversed from one side to the other by at least two tunnels isolated from each other, each tunnel developing helically around a main axis of the nozzle.
- the expression “from side to side” means that the ends of the tunnels open on walls oriented substantially perpendicular to the main axis of the nozzle. More specifically, for a substantially cylindrical body, the ends of the tunnels are located on bases of the cylinder and not on a lateral surface of said cylinder.
- the terms “inlet” or “inlet end” of the nozzle, and the terms “outlet” or “outlet end” of the nozzle designate said walls substantially perpendicular to the main axis of the nozzle.
- the helicoidal shape of the powder projection tunnels makes it possible, at the outlet of the nozzle, to give said powder a direction with a lateral component.
- the powder is projected towards the inner wall of said tube, obliquely to the axis of the tube.
- Another object of the invention is indeed a device for spraying powdery solid products intended for coating objects, comprising a projection nozzle as described above, characterized in that each of the tunnels is connected, as input to the nozzle, to an individual supply fluid mixture / solid (s) powder (s).
- the fluid is compressed air.
- each power supply being autonomous and each tunnel being independent until the exit of the nozzle, it is possible to feed each tunnel with a different powder.
- a different color powder For example, it is possible to feed each tunnel with a different color powder.
- This aspect of the invention makes it possible to carry out coin recovery studies by visualizing, thanks to the different colors, the amplitude of said overlap. It is therefore easier to optimize the device and the projection method for a tube of given diameter.
- the body of the nozzle is traversed right through by a central orifice, substantially coaxial with said body. This orifice is particularly intended to be supplied with fluid.
- the central orifice is connected, at the inlet of the nozzle, to an individual supply of fluid, for example compressed air.
- a preferred form of the invention provides a baffle at the nozzle outlet.
- a portion of said deflector is substantially cone-shaped coaxial with the body, the cone truncated flaring away from the body along the main axis of the nozzle.
- Such a deflector is preferably fitted into the central orifice.
- the body of the nozzle is traversed by at least one tube, a first end of said tube opening inside the central orifice, a second end of said tube opening out of the body , an average section area of said tube being at most equal to 25% of a mean cross-sectional area of a tunnel.
- This or these tubes can lead out of the nozzle. They can be fed by fluid flows from the central orifice.
- a portion of these tubes has a helical shape, similar to the shape of the tunnels.
- a nozzle according to the invention can be adapted to hot powdering as to electrostatic powdering.
- the body of the nozzle in a material that can generate a triboelectric charge exchange with the powder material or materials.
- the polytetrafluoroethylene (PTFE) nozzle can be produced.
- the nozzle In the case of hot powdering, the nozzle is in particular placed inside a tube heated to a temperature above the temperature melting of the powder. The nozzle itself must therefore be able to withstand such a high temperature.
- the nozzle is made of a material of high melting point, such as a metal.
- the nozzle is made of polyamide type polymer material. This type of material is likely to melt at the temperature inside the tube.
- the body of the nozzle is provided with a cooling cage.
- a cooling cage consists of an envelope covering an external lateral surface of the body of the nozzle.
- said envelope is perforated with at least one hole; said hole is located opposite a space between the outer lateral surface of the body of the nozzle and an inner lateral surface of the casing, said space being facing a second end of a tube.
- a tube may be powered by a flow of air from the central orifice. This air flow, circulating in the space between the two surfaces, convectively cools the casing and the body of the nozzle.
- the casing keeps the body of the nozzle at a lower temperature than that of the interior of the object to be sprayed.
- the nozzle is provided with a tubular nozzle at its inlet end, said nozzle being fitted into a portion of the central orifice, a side wall of the nozzle being perforated with at least one channel, an end of said channel being coplanar at a first end of a tube in a plane perpendicular to the main axis of the nozzle.
- a nozzle has the function of distributing the air flows between the various tubes opening into the central orifice, in particular between the tubes modulating the paths of the powder and those feeding the cooling cage.
- the various elements of the nozzle can be made of different materials and according to different methods.
- a laser sintering method or laser sintering, is particularly advantageous for producing the body of the nozzle.
- the presence of helical tunnels makes it difficult to machine such a part.
- Laser sintering makes it possible to produce a one-piece body.
- the tip and the deflector can also be made by laser sintering.
- a laser sintering method is described in particular in FR2828422. This method involves a computer controlled device for making three-dimensional objects layer by layer from a laser fusible powder. A laser irradiates selected locations of each layer to melt the powder.
- Various materials can be used for laser sintering, in particular PTFE, polyetherketone, polyetheretherketone or PEEK, polyetherketoneketone or PEKK, polyetheretherketoneketone, fluoropolymers such as polyvinylidene fluoride or PVDF and polyamides such as polyamide 11 or polyamide 12.
- Certain metals such as aluminum, or metal alloys such as steel or copper alloys, can also be used.
- Materials used for the manufacture of the nozzle according to the invention may further comprise fillers such as inorganic or organic fillers, fibers, balls or particles of glass, carbon, boron, ceramic, powder aluminum, nano-fillers, nano-clays or carbon nano-tubes. These fillers make it possible to improve mechanical properties, such as the breaking stress and elongation at break, of a nozzle made by melting powder. Powdered materials used for the manufacture of the nozzle according to the invention may further comprise additives.
- fluidization agents such as silica powder; anti-UV agents; antioxidants; dyes; pigments; bactericides; flameproofing agents, in particular those based on phosphorus, such as an organic phosphinate of a metal and / or ammonium polyphosphate.
- the body of the nozzle is made of a material chosen from a polyamide, PTFE, PEEK, PEKK and PVDF. These materials have a relatively low density. As will be developed later, a low weight nozzle has advantages during the implementation of the spray.
- the body of the nozzle is made of metal.
- Metal is particularly preferred for nozzles for the internal coating of small diameter tubes by hot powdering. Indeed, the temperatures prevailing inside the tubes to be coated may be too high for a polyamide nozzle, despite the presence of a cooling system. This is particularly the case when the diameter of the tube is close to that of the nozzle used.
- the invention also relates to a method of coating the interior of a tubular object, comprising a step in which a powdery solid is sprayed inside said tubular object by a device as described above, the projection nozzle being moved axially inside the tubular object, or the tubular object being moved axially around the nozzle.
- it is indeed unnecessary to print a rotational movement to the tube or the nozzle to ensure a homogeneous recovery of the inside of the tube. Axial displacement is sufficient.
- the relative speed of movement of the nozzle relative to the tube, the diameter of the tube and the fluid pressure condition the thickness of the deposited powder layer.
- Figure 1 is a perspective view of an axial section of the body of a nozzle according to one embodiment of the invention
- Figure 2 a view of the outlet end of said nozzle body
- Figure 3 is an axial sectional view of a nozzle according to one embodiment of the invention.
- Figure 4 a diagram of a spraying device according to one embodiment of the invention
- Figure 5 a graph showing the speed of displacement of a tube relative to said device as a function of the internal diameter of said tube, to obtain a coating of given thickness, by a method according to one embodiment of the invention.
- Figure 1 is a perspective view of an axial section of a body 2 of a nozzle 1 according to one embodiment of the invention.
- the external shape of the body 2 is substantially cylindrical in revolution along an axis 3.
- the body 2 of the nozzle has an inlet end 4 and an outlet end 5.
- the body 2 is traversed right through by tunnels 6, whose The ends open respectively to the inlet end 4 and the outlet end 5.
- the tunnels 6 are of identical shape and size. They are arranged in a symmetry of rotation with respect to the axis 3.
- the tunnels 6 develop by forming circular helices, of identical pitch, about the axis 3.
- the tunnels 6 have a substantially elliptical section.
- the number of tunnels 6 depends in particular on the internal diameter of the tubular pieces that the nozzle 1 is intended to coat. For tubular pieces of small diameter, two tunnels 6 may be sufficient.
- the number of tunnels 6 is between three and sixteen.
- each of the tunnels 6 is extended by a nozzle 7, which makes it possible to connect said tunnel 6 to a supply of fluid / solid powder mixture.
- Each endpiece 7 is oriented parallel to the axis 3 of the body 2. Upon entering the nozzle 1, a flow of fluid mixture / solid (s) powder (s) moves in the direction of the axis
- an angle formed by the axis 3 and by a tangent of a tunneling curve of a tunnel 6 helical is between
- the body 2 is furthermore traversed right through by a central orifice 8, substantially coaxial with said body 2.
- the orifice 8 may have a shape and a diameter that vary along its length, said length being included between the inlet 4 and the outlet 5 of the nozzle.
- the orifice 8 has a substantially cylindrical portion 9, located near the outlet 5 of the nozzle.
- the orifice 8 further comprises a substantially cylindrical portion 10 located near the inlet 4 of the nozzle. Parts 9 and 10 have different average diameters.
- the internal surfaces of the parts 9 and 10 have a complementary shape of parts that can fit into said parts 9 and 10. These parts will be described later.
- an internal diameter of said orifice remains between 20% and 60% of an external diameter of the body 2.
- the helical tunnels 6 develop in a space between the orifice 8 and an outer side surface 11 1 of the body 2.
- the body 2 is further traversed by tubes (12, 13).
- a first end 14 of said tubes opens into the central orifice 8, more particularly at the portion 10.
- a portion 15 of the tubes (12, 13) is substantially rectilinear, oriented perpendicular to the axis 3. Said part 15 ends with a bend 16, from which the tube 12 or 13 develops forming a circular helix around the axis 3, towards the outlet 5 of the body 2.
- the helix formed by a tube 12 or 13 has a pitch substantially equal to the pitch of the helix formed by a tunnel 6.
- An outer tube 12 develops in a space between the tunnels 6 and the surface 1 1 external side of the body.
- An inner tube 13 develops in a space between the tunnels 6 and the central orifice 8.
- FIG. 2 is a view of the outlet end of the body 2.
- the output ends 17 of the tunnels 6, the outlet ends 18 of the outer tubes 12 and the outlet ends 19 of the inner tubes 13 are distinguished.
- the ends 19, 17 and 18 are respectively arranged in three concentric circles of increasing radius.
- Tubes (12, 13) are intended to be supplied with fluid, via the central orifice 8. Fluid flows, in particular compressed air, coming out of the tubes (12, 13) serve to modulate the trajectory of the fluid / powder mixture flows leaving the tunnels 6.
- the nozzle may comprise a part, described below, whose function is to manage the fluid supply of the tubes (12, 13).
- the number of outer tubes 12 and the number of inner tubes 13 are equal to the number of tunnels 6.
- the ends (18, 19) of said tubes are arranged staggered with respect to the exit ends 17 of the tunnels 6. Such an arrangement is shown in FIG. 2.
- An average cross-sectional area of a tube 12 or 13 is significantly smaller than an average section surface 21 of a tunnel 6.
- An average surface area 20 is in particular less than or equal to 25% of an average surface area.
- an average surface area 20 is less than or equal to 15% of an average area 21.
- Figure 3 is an axial sectional view of a nozzle 1 according to one embodiment of the invention.
- the nozzle 1 comprises in particular a body 2 as shown in FIGS. 1 and 2.
- the external lateral surface 11 of the body 2 is surrounded by an envelope 24, which conforms to a portion of said surface 11.
- a space here a groove 23, is between another part of the surface 11 and an inner surface of the 24.
- the groove 23 traverses the surface 1 1 in a direction parallel to the axis 3. It is however possible to give a different shape to said groove.
- the surface 11 may also comprise a plurality of grooves 23.
- the space between the surface 11 and the envelope 24 may also be around the body 2, for example symmetrically about the axis 3.
- space can be formed by a hollow in the surface 1 1, such as the groove 23.
- Said space can also be formed by a recess in the inner surface of the casing 24.
- the body 2 is traversed by a tube 22, said tube being substantially perpendicular to the axis 3.
- a first end of the tube 22 opens into the central orifice 8, at the portion 10.
- the tube 22 opens on the space between the surface 1 1 and the envelope 24.
- the tube 22 opens in particular on the groove 23 formed in the surface January 1.
- the casing 24 has a hole 25, located opposite the groove 23.
- a fluid such as compressed air, coming from the central orifice 8, can pass through the tube 22.
- the fluid then flows into the groove 23, contact of an inner surface of the envelope 24.
- a heat transfer can therefore take place between the fluid and the envelope 24, and between the fluid and the surface 11 of the body 2.
- the fluid then leaves the nozzle 1 through the hole 25 in the envelope 24.
- the envelope 24 and the body 2 can be cooled by convection.
- the cooled envelope 24 then contributes to cooling the body 2.
- the envelope 24 fulfills the function of cooling cage of the nozzle 1.
- Various materials can be used to make the envelope 24.
- said envelope is made of metal.
- the nozzle 1 is provided with a tubular endpiece 26, fitted into the portion 10 of the central orifice 8.
- the tip 26 is traversed by a main channel 27, coaxial with the body 2.
- the tip 26 is also traversed by secondary channels 28, perpendicular to the axis 3.
- One end of the channels 28 opens into the main channel 27, l other end opens into the portion 10 of the orifice 8.
- the secondary channels 28 are coplanar to the ends of tubes 12, 13 or 22.
- the central orifice 8 can be fed with fluid or not.
- the tubes 12, 13 or 22 are supplied with fluid or not, depending on the presence or absence of a channel 28 facing one end of said tubes.
- the tip 26 thus makes it possible to manage the distribution of fluid between the tubes (12, 13, 22).
- first tube ends 12 and / or 13 and / or 22 are coplanar in a plane perpendicular to the axis 3. Said ends open into a circular groove 29 formed in a surface of the part 10 of the orifice 8. Said groove may be coplanar with a channel 28. This groove 29 allows a same channel 28 to supply fluid to all the tubes 12 and / or 13 and / or 22 opening into said groove.
- Said tip may in particular be made by laser sintering, as well as the body 2.
- the materials suitable for laser sintering, previously mentioned, may be used.
- the nozzle 1 comprises a first deflector 30 at its outlet end.
- a deflector 30 is intended to orient the trajectory of the powder jet in the lateral direction.
- a deflector 30 comprises in particular a portion 31, substantially cylindrical, coaxial with the body 2, nested in the part 9 of the central orifice 8.
- the deflector also comprises a portion 32 in the form of a truncated cone coaxial with the body 2, said portion 32 extending the portion 31.
- the frustum of the portion 32 flares away as one moves away from the body 2 along the axis 3. It is possible to push more or less the cylindrical portion 31 in the orifice 8 of the body 2, in order to modulate the distance between the frustoconical portion 32 and the outlet end 5 of the nozzle.
- the frustoconical portion 32 is extended at its widest end by a substantially annular substantially plane portion 33, perpendicular to the axis 3. It is also possible to extend the portion 32 frustoconical by a cylindrical portion coaxial with the body 2, or by a curved portion outwardly of the truncated cone.
- the nozzle 1 with a second deflector.
- Part of such a second baffle has substantially the shape of a cone frustum coaxial with the body 2.
- Said body 2 is inside said truncated cone.
- Said truncated cone flares away from the flare of the portion 32 of the first deflector 30.
- the deflector 30 may in particular be made by machining, or by laser sintering.
- the deflector can be made of metal.
- the deflector 30 is made of a polymer such as a polyamide or PTFE. These materials are indeed lighter and more flexible than metal.
- FIG 4 shows a diagram of a spray device according to one embodiment of the invention.
- a spray device is particularly intended for coat the inside with tubular objects by hot powdering.
- This device 35 comprises in particular a nozzle 1 as described above.
- the device 35 further comprises a support rod 36, at one end of which is fixed the nozzle 1.
- the rod 36 is coaxial with the axis 3 of the nozzle 1.
- Various solutions can be adopted to secure the rod 36 and the nozzle 1.
- the nozzle 1 is fixed to the rod 36 via the nozzle 26.
- Said nozzle is fitted into a conduit 37 which passes through the rod 36.
- the duct 37, coaxial to the rod 36 and the nozzle 1, is intended to supply the central orifice 8 with compressed air.
- Pipes 41 intended to feed the tunnels 6 in a fluid / powder mixture, can also be integrated into the rod 36. This solution makes it possible to optimize a thermal protection of said ducts 41.
- the ducts 41 are external to the rod 36 and fixed to said rod over part of their length.
- the rod 36 has a length 38 greater than or equal to the length of a tube 39, whose interior is intended to be coated with powder by the device 35.
- the rod 36 and the tube 39 are arranged coaxial, along axis 3.
- the rod 36 is fixed to a support 40.
- the rod 36 is self-supporting, that is to say that it is cantilevered. It is also possible to provide the rod 36, close to the nozzle 1, legs that support the weight of said rod and the nozzle 1. Devices with such legs are known from the prior art. These legs usually rest on wheels. When the tube 39 moves during the coating, the rollers pass inside said tube and can damage the preparation of the surface to be coated.
- elements of the nozzle 1 are made of polymer, in particular polyamide.
- the body 2, the deflector 30 and the tip 26 may be made of polyamide 1 1. This material is relatively light.
- a nozzle as described above, made of polyamide 1 1 can weigh about 200 g. It is possible to the cane 36 of support such a weight while remaining coaxial with the tube 39, even when said rod has a length 38 important.
- the tunnels 6 of the nozzle 1 are supplied with a compressed air / powder mixture via the nozzles 7.
- Each tunnel 6 is individually powered by a conduit 41.
- Each conduit 41 is connected to a reserve 42 of powder.
- the powder is for example sampled by a vacuum suction system 43, traversed by a flow of compressed air and connected to the duct 41. It is possible to connect the different ducts 41 to the same store.
- each duct 41 has its own powder supply system 43.
- each tunnel 6 is supplied independently with a compressed air / powder mixture.
- the reserve 42 can consist of a bag of powder or a fluidized bed. Inside a fluidized bed is powder in a fluidized state, in the presence of a gas such as air.
- the powder used by the device 35 is of small particle size, for example 0.01 to 1 mm.
- the powder may in particular be a thermoplastic polymer such as polyamide 11.
- the tube 39 In order to coat the inside of a tube 39 with a thermoplastic film, the following method is used, for example: the tube 39, previously heated, is displaced along the axis 3 in the direction of the support 40 of the rod 36.
- tube 39 is for example displaced by means of a carriage 44 which rolls on rails 45.
- Said rails 45 are parallel to the axis 3 of the device 35.
- Compressed air is sent into the powder collection systems 43, as well as into the duct 37.
- a powder / compressed air mixture passes into the ducts 41, then into the end pieces 7, then into the helical tunnels 6 of the nozzle 1.
- the different streams of the tunnels 6 form, at the outlet of the nozzle, a conical jet which projects the powder on the inner wall 46 of the tube 39.
- Figure 5 shows a graph showing the speeds of displacement of the tube 39 as a function of the internal diameter of said tube, in order to obtain a coating of 150 ⁇ m of polyamide film 1 1.
- the device used is that represented in FIG. 4.
- the measurements are made at several pressures, the indicated pressure being the overall air pressure for the eight powder feeds of the nozzle 1.
- FIG. 5 shows that the larger the diameter of the tube 39, the slower the tube travel must be to obtain the desired film thickness.
- a nozzle according to the invention makes it possible to obtain a powerful and homogeneous jet of powder. It is therefore possible to move the tubes faster than in known devices, for the same thickness of coating desired.
- the device according to the invention offers a better productivity than spraying devices of the state of the art.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Nozzles (AREA)
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0952824A FR2944980B1 (fr) | 2009-04-29 | 2009-04-29 | Dispositif et procede de pulverisation |
PCT/FR2010/050775 WO2010125282A1 (fr) | 2009-04-29 | 2010-04-22 | Dispositif et procede de pulverisation |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2424677A1 true EP2424677A1 (fr) | 2012-03-07 |
Family
ID=41278138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10723724A Withdrawn EP2424677A1 (fr) | 2009-04-29 | 2010-04-22 | Dispositif et procede de pulverisation |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120058264A1 (fr) |
EP (1) | EP2424677A1 (fr) |
CA (1) | CA2758483A1 (fr) |
FR (1) | FR2944980B1 (fr) |
WO (1) | WO2010125282A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2971260B1 (fr) * | 2011-02-03 | 2021-02-19 | Peugeot Citroen Automobiles Sa | Procede de revetement d'un fut de carter cylindres par deplacement du cylindre le long de l'axe du fut, vehicule et machine correspondants |
US8544408B2 (en) * | 2011-03-23 | 2013-10-01 | Kevin Wayne Ewers | System for applying metal particulate with hot pressurized air using a venturi chamber and a helical channel |
US9027506B2 (en) * | 2011-05-02 | 2015-05-12 | Nordson Corporation | Dense phase powder coating system for containers |
RU2609481C1 (ru) * | 2012-12-31 | 2017-02-02 | 3М Инновейтив Пропертиз Компани | Устройство для нанесения покрытия на трубы на месте эксплуатации и связанные с ним способы |
US9610611B2 (en) * | 2014-02-12 | 2017-04-04 | Baker Hughes Incorporated | Method of lining an inner surface of a tubular and system for doing same |
CN107262320B (zh) * | 2017-06-26 | 2023-08-29 | 中信戴卡股份有限公司 | 一种混线式轮毂螺栓孔自动清粉系统及组合式清粉枪 |
US10583445B2 (en) | 2017-10-16 | 2020-03-10 | Kidde Technologies, Inc. | Cyclonic-aspirating cargo fire suppression nozzle |
US11148327B2 (en) | 2018-03-29 | 2021-10-19 | Baker Hughes, A Ge Company, Llc | Method for forming a mud motor stator |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2930121A1 (de) * | 1979-07-25 | 1981-02-05 | Gema Ag | Spruehverfahren und sprueheinrichtung, insbesondere zum sruehbeschichten von gegenstaenden mit pulver |
US6202945B1 (en) * | 1997-04-22 | 2001-03-20 | Kao Corporation | Method and apparatus for electrostatic powder coating |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2026348A (en) * | 1978-04-29 | 1980-02-06 | Mcarthur H | Spraying inside hollow bodies |
ES8200571A1 (es) * | 1980-01-04 | 1981-12-01 | Icab Ind Coating Ab | Disposicion relacionada con boquillas de rociadores de polvoo para la desintegracion y distribucion de particulas soli- das en forma de polvo dentro de una corriente gaseosa |
EP0093083B2 (fr) * | 1982-04-27 | 1993-11-24 | Siegfried Frei | Procédé pour appliquer une couche en poudre et appareil pour l'application de poudre |
DE8516746U1 (de) * | 1985-06-07 | 1985-08-29 | Vsesojuznyj naučno-issledovatel'skij, proektno-konstruktorskij i technologičeskij svetotechničeskij institut (VNISI), Moskau/Moskva | Vorrichtung zum Auftragen pulverförmiger Stoffe auf Werkstücke |
SE451954B (sv) * | 1985-10-18 | 1987-11-09 | Icab Ind Coating Ab | Pulverspruta med spiralformigt krokta laddningskanaler och en diffusoranordning placerad i handtagsdelen |
DE3731181A1 (de) * | 1987-09-17 | 1989-03-30 | Castolin Gmbh | Verfahren und vorrichtung zum beschichten von schwer zugaenglichen, hohlraeume ganz oder teilweise umschliessenden wandflaechen metallischer gegenstaende |
US4987001A (en) * | 1989-02-09 | 1991-01-22 | Nordson Corporation | Method and apparatus for coating the interior surface of hollow, tubular articles |
DE10138917A1 (de) * | 2001-08-08 | 2003-03-06 | Itw Gema Ag | Pulversprühbeschichtungsvorrichtung |
DE102005045176A1 (de) * | 2005-09-21 | 2007-03-22 | Ramseier Technologies Ag | Applikator |
EP2050506A1 (fr) * | 2007-10-19 | 2009-04-22 | Boxal Netherlands B.V. | Appareil de revêtement en poudre par pulvérisation |
-
2009
- 2009-04-29 FR FR0952824A patent/FR2944980B1/fr active Active
-
2010
- 2010-04-22 WO PCT/FR2010/050775 patent/WO2010125282A1/fr active Application Filing
- 2010-04-22 EP EP10723724A patent/EP2424677A1/fr not_active Withdrawn
- 2010-04-22 CA CA2758483A patent/CA2758483A1/fr not_active Abandoned
- 2010-04-22 US US13/266,289 patent/US20120058264A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2930121A1 (de) * | 1979-07-25 | 1981-02-05 | Gema Ag | Spruehverfahren und sprueheinrichtung, insbesondere zum sruehbeschichten von gegenstaenden mit pulver |
US6202945B1 (en) * | 1997-04-22 | 2001-03-20 | Kao Corporation | Method and apparatus for electrostatic powder coating |
Non-Patent Citations (1)
Title |
---|
See also references of WO2010125282A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2944980A1 (fr) | 2010-11-05 |
WO2010125282A1 (fr) | 2010-11-04 |
FR2944980B1 (fr) | 2012-12-14 |
CA2758483A1 (fr) | 2010-11-04 |
US20120058264A1 (en) | 2012-03-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2010125282A1 (fr) | Dispositif et procede de pulverisation | |
EP0312428B1 (fr) | Dispositif d'injection d'une charge d'hydrocarbures dans un réacteur de craquage catalytique | |
EP0755720B1 (fr) | Dispositif de pulvérisation d'un produit liquide | |
CA2976569A1 (fr) | Dispositif de mise en rotation d'un fluide a l'interieur d'une buse, ensemble comprenant un tel dispositif et dispositif d'application | |
WO2012076368A1 (fr) | Procede et dispositif de generation de gouttelettes a spectre granulometrique modulable | |
KR102577364B1 (ko) | 사이클론 냉각 효과를 가진 성형 후 냉각 방법 | |
TWI702088B (zh) | 霧化器及使用一對反向旋轉滾輪霧化一流體的方法 | |
JP2019529685A (ja) | 球状構造を有する粉状プラスチックの製造装置および製造方法 | |
EP3140031A1 (fr) | Dispositif d'injection, notamment pour injecter une charge d'hydrocarbures dans une unité de raffinage. | |
CN203999818U (zh) | 一种激光宽带熔覆光内送粉装置 | |
CN102274807A (zh) | 一种对磨削加工进行喷雾冷却的喷嘴 | |
FR2549743A1 (fr) | Dispositif et procede de projection pour former des refractaires | |
EP2202332B1 (fr) | Méthode d'accélération gazodynamique de matériaux en poudre et dispositif pour sa mise en oeuvre | |
EP1883478A1 (fr) | Buse a chambre tourbillonnaire | |
CA3031873A1 (fr) | Procede d'isolation d'un four par insufflation de matieres isolante sans ajout de liant, ni d'eau | |
EP3902650A1 (fr) | Tête optique d'impression 3d par projection de poudre | |
JP6272443B2 (ja) | 管の塗装装置および塗装方法 | |
EP2836309B1 (fr) | Projecteur rotatif et methode de pulverisation d'un produit de revetement | |
CN102500485A (zh) | 环形放电喷嘴 | |
CN107339157A (zh) | 定向流喷嘴旋流增强器 | |
LU86174A1 (fr) | Procede de formation d'une masse refractaire et lance de projection de particules refractaires et de particules oxydables exothermiquement | |
WO2020074590A1 (fr) | Injecteur d'alimentation de poudre | |
WO2015170039A1 (fr) | Dispositif d'injection, notamment pour injecter une charge d'hydrocarbures dans une unité de raffinage. | |
FR2752176A1 (fr) | Pulverisateur et procede pour ejecter un liquide sous forme de fines particules | |
EP0545782B1 (fr) | Dispositif pour répartir pneumatiquement des poudres dans une section annulaire et four l'utilisant |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20111006 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: THOMAS, ALINE Inventor name: FILOU, GREGORY Inventor name: HUZE, DENIS |
|
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: B05B 12/14 20060101AFI20130925BHEP Ipc: B05B 7/14 20060101ALI20130925BHEP Ipc: B05B 7/10 20060101ALI20130925BHEP Ipc: B05B 5/047 20060101ALN20130925BHEP Ipc: B05B 7/08 20060101ALI20130925BHEP Ipc: B05B 5/00 20060101ALN20130925BHEP Ipc: B05D 1/06 20060101ALI20130925BHEP Ipc: B05B 13/06 20060101ALI20130925BHEP Ipc: C23C 4/16 20060101ALI20130925BHEP Ipc: B05D 3/02 20060101ALI20130925BHEP Ipc: B05B 1/26 20060101ALI20130925BHEP Ipc: B05D 7/22 20060101ALI20130925BHEP Ipc: B05B 5/12 20060101ALN20130925BHEP Ipc: B05B 5/16 20060101ALN20130925BHEP Ipc: B05B 1/28 20060101ALI20130925BHEP Ipc: B05B 5/03 20060101ALN20130925BHEP |
|
INTG | Intention to grant announced |
Effective date: 20131025 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20131101 |