WO2023147275A1 - Dispositif de pulvérisation de poudre et procédé de mise en œuvre - Google Patents

Dispositif de pulvérisation de poudre et procédé de mise en œuvre Download PDF

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Publication number
WO2023147275A1
WO2023147275A1 PCT/US2023/061070 US2023061070W WO2023147275A1 WO 2023147275 A1 WO2023147275 A1 WO 2023147275A1 US 2023061070 W US2023061070 W US 2023061070W WO 2023147275 A1 WO2023147275 A1 WO 2023147275A1
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WO
WIPO (PCT)
Prior art keywords
tube
porous
adapter
flow channel
channel
Prior art date
Application number
PCT/US2023/061070
Other languages
English (en)
Inventor
Brian D. Mather
Original Assignee
Nordson Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nordson Corporation filed Critical Nordson Corporation
Publication of WO2023147275A1 publication Critical patent/WO2023147275A1/fr

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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
    • 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
    • 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
    • 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
    • B05B5/043—Discharge apparatus, e.g. electrostatic spray guns using induction-charging

Definitions

  • This disclosure relates generally to material application systems, more particularly, to a powder coating material spray device and method of implementation.
  • Material application systems are used to apply one or more materials in one or more layers to an object.
  • General examples are powder coating systems, as well as other particulate material application systems such as may be used in the food processing and chemical industries.
  • Spray gun as used herein includes any electrostatic spray device, whether or not hand-held, and whether or not configured in the shape of a pistol.
  • the spray gun can include a nozzle to shape the spray pattern of the gun. Pressurized air is also used to shape the spray pattern, referred hereafter as “pattern air.”.
  • Spray technology may include electrostatic and nonelectrostatic methods.
  • An aspect of the present disclosure provides a spray material tube assembly for use in a spray gun.
  • the spray material tube assembly comprises an outer tube and a porous tube.
  • the outer tube has an inner surface defining a tube channel extending through the outer tube from a proximal end of the outer tube to a distal end of the outer tube.
  • the porous tube is positioned within the tube channel between the proximal end and the distal end of the outer tube.
  • the porous tube has an outer porous surface and an opposing inner porous surface.
  • the porous tube defines a plurality of pores that fluidly connect the outer porous surface with the inner porous surface.
  • the outer porous surface defines a radially protruding portion and a radially recessed portion.
  • the radially protruding portion is in contact with the inner surface of the outer tube, and the radially recessed portion of the porous tube and the inner surface of the outer tube define a first air flow channel therebetween.
  • the inner porous surface defines an air and material flow channel extending through the porous tube from a proximal porous end to a distal porous end.
  • the inner porous surface is sized to receive a material tube within.
  • the inner surface of the outer tube and an outer surface of the material tube define a second air flow channel therebetween that extends between the proximal porous end of the porous tube and the proximal end of the outer tube.
  • the second air flow channel is in fluid communication with the air and material channel via the first air flow channel and the plurality of pores of the porous tube.
  • the material spray gun system comprises a spray gun and a spray material tube assembly.
  • the spray gun defines a tube receiving channel.
  • the spray material tube assembly is removably connected within the tube receiving channel.
  • the spray material tube assembly comprises an outer tube, a porous tube, and a material tube.
  • the outer tube has an inner surface that defines a tube channel extending through the outer tube from a proximal end to a distal end.
  • the porous tube is positioned within the tube channel between the proximal end and the distal end of the outer tube.
  • the porous tube has an outer porous surface and an opposing inner porous surface and defines a plurality of pores that fluidly connect the outer porous surface with the inner porous surface.
  • the outer porous surface has a radially recessed portion that is spaced away from the inner surface of the outer tube defining a first air flow channel therebetween.
  • the inner porous surface defines an air and material flow channel extending through the porous tube from a proximal porous end to a distal porous end.
  • the material tube is connected to the porous tube at the proximal porous end.
  • the inner surface of the outer tube and an outer surface of the material tube define a second air flow channel therebetween that extends between the proximal porous end of the porous tube and the proximal end of the outer tube.
  • the second air flow channel is in fluid communication with the air and material channel via the first air flow channel and plurality of pores of the porous tube.
  • Another aspect of the present disclosure provides a method for implementing a spray material tube assembly for use in a spray gun.
  • the method comprises: inserting a porous tube within a tube channel defined by an outer tube, the porous tube having an outer porous surface and an opposing inner porous surface, the porous tube defining a plurality of pores that fluidly connect the outer porous surface with the inner porous surface, the outer porous surface defining a radially protruding portion and a radially recessed portion, the radially protruding portion being in contact with an inner surface of the outer tube, and the radially recessed portion of the porous tube and the inner surface of the outer tube defining a first air flow channel therebetween, the inner porous surface defining an air and material flow channel extending through the porous tube from a proximal porous end to a distal porous end; and connecting a material tube to the proximal porous end of the porous tube, the inner surface of the outer tube and an outer surface of the material tube
  • FIG. 1 illustrates a schematic of an electrostatic spray coating device, according to an aspect of this disclosure.
  • FIG. 2 illustrates a schematic of a cross-sectional view of a portion of an electrostatic spray coating device, according to an aspect of this disclosure.
  • FIG. 3 illustrates a perspective view of a material delivery assembly, according to an aspect of this disclosure.
  • FIG. 4 illustrates a side view of the material delivery assembly shown in FIG. 3, according to an aspect of this disclosure.
  • FIG. 5 illustrates a cross-sectional view of the material delivery assembly taken along line 5-5 in FIG. 4, according to an aspect of this disclosure.
  • FIG. 6 illustrates a perspective view of an inlet adapter, according to an aspect of this disclosure.
  • FIG. 7 illustrates a side view of the inlet adapter shown in FIG. 6, according to an aspect of this disclosure.
  • FIG. 8 illustrates a cross-sectional view of the inlet adapter taken along line 8-8 in FIG. 7, according to an aspect of this disclosure.
  • FIG. 9 illustrates a perspective view of an outer tube, according to an aspect of this disclosure.
  • FIG. 10 illustrates a side view of the outer tube shown in FIG. 9, according to an aspect of this disclosure.
  • FIG. 11 illustrates a cross-sectional view of the outer tube taken along line 11- 11 in FIG. 10, according to an aspect of this disclosure.
  • FIG. 12 illustrates a perspective view of a transition, according to an aspect of this disclosure.
  • FIG. 13 illustrates a side view of the transition adapter shown in FIG. 12, according to an aspect of this disclosure.
  • FIG. 14 illustrates a cross-sectional view of the transition adapter taken along line 14-14 in FIG. 13, according to an aspect of this disclosure.
  • FIG. 15 illustrates a perspective view of a material tube, according to an aspect of this disclosure.
  • FIG. 16 illustrates a side view of the material tube shown in FIG. 15, according to an aspect of this disclosure.
  • FIG. 17 illustrates a cross-sectional view of the material tube taken along line 17-17 in FIG. 16, according to an aspect of this disclosure.
  • FIG. 18 illustrates a perspective view of a porous tube, according to an aspect of this disclosure.
  • FIG. 19 illustrates a side view of the porous tube shown in FIG. 18, according to an aspect of this disclosure.
  • FIG. 20 illustrates a cross-sectional view of the porous tube taken along line 20-20 in FIG. 19, according to an aspect of this disclosure.
  • FIG. 21 illustrates a close-up view of the material delivery assembly shown in box 21 in FIG. 5, according to an aspect of this disclosure.
  • FIG. 22 illustrates a close-up view of the material delivery assembly shown in box 22 in FIG. 5, according to an aspect of this disclosure.
  • the disclosure relates generally to a material delivery assembly or module for a spray coating system.
  • the material delivery module can be removably attached to a housing of a spray gun.
  • a powder delivery hose can be attached to the material delivery module using, for example, a hose barb feature of an inlet adapter of the module.
  • the powder delivery path can remain at the smaller diameter associated with high density (HD) material delivery.
  • Pattern air can enter the module via a cross-drill feature of the inlet adapter.
  • the air can flow through the module in a passage created between an outer diameter of a material tube and an inner diameter of an outer tube in which the material tube is positioned within.
  • the air can flow through the passage and to a porous tube toward a distal end of the module.
  • the porous tube can comprise, for example, a sintered plastic material or other material that allows the pattern air to pass through the porous tube into a flow path of the material.
  • the overall configuration of the HD material delivery module can allow the entire assembly to be removed from the spray gun without disassembling the spray gun.
  • FIG. 1 illustrates a schematic of a material spray system 100, according to an aspect of this disclosure.
  • the material spray system 100 may include a spray gun 102, which can be any spray gun design that is configured to receive a material delivery assembly 200 and perform a powder coating operation as described herein.
  • the spray gun 102 may receive a number of inputs, including pressurized air from an air supply 104, spray material from a spray material supply 106, and in the case of an electrostatic gun a power input from an external power supply 108.
  • the spray gun 102 can receive a flow of spray coating material through a feed hose 110 from the spray material supply 106 that may include a pump, a delivery system, and/or the like.
  • the spray material supply 106 provides powder in dense phase, meaning that the material flow through the feed hose 110 into the material delivery assembly positioned in the spray gun 102 can include a rich mixture of powder and air, with a high ratio of powder to air.
  • dense phase is meant that the air present in the material flow is about the same as the amount of air used to fluidize the material at the spray material supply 106, such as a feed hopper.
  • dense phase and “high density” are used to convey the idea of a low or lower air volume mode of material flow in a pneumatic conveying system where not all of the material particles are carried in suspension.
  • the spray material is forced along a flow passage by significantly less air volume, with the material flowing more in the nature of plugs that push each other along the passage, somewhat analogous to pushing the plugs as a piston through the passage. With smaller cross-sectional passages, this movement can be affected under lower pressures.
  • the spray gun 102 includes a nozzle assembly 112.
  • the nozzle assembly 112 can produce a desired spray pattern of a spray coating material and air combination P.
  • the nozzle assembly 112 can be one of a variety of nozzle assemblies used for forming spray patterns of spray coating material and air.
  • the external power supply 108 can power an electrode (not shown) positioned within or in close proximity to the nozzle assembly 112 of the spray gun 102. It will be appreciated that the external power supply 108 can be external to the spray gun 102 or be located internally within the spray gun 102. Either or both of the external power supply 108 and the internal power supply (not shown) can provide the power to the electrode.
  • the external power supply 108 can be connected to the spray gun 102 by, for example, a high voltage cable 114.
  • the spray material supply 106 is connected to the spray gun 102 by, for example, the feed hose 110.
  • the feed hose 110 can include, for example, a tube or other conduit.
  • the spray material supply 106 supplies the spray material to the spray gun 102 that is applied to a spray part 101.
  • the material can include, for example, a powder, a liquid, combinations thereof, or still other material for coating the spray part 101.
  • the air supply 104 is connected to the spray gun 102 by, for example, a tube, a hose, and/or other conduit, hereinafter referenced as an air tube 116 for brevity.
  • the air supply 104 supplies air to the spray gun 102 that is combined with the spray material from the spray material supply 106 within the material delivery assembly 200 positioned within the spray gun 102, as further described below.
  • the combination of the air and spray material P is sprayed through the nozzle assembly 112 of the spray gun 102 onto the spray part 101 to apply a coating onto the spray part 101 .
  • the air and spray material can be in electrical contact with the electrode.
  • the spray part 101 is grounded.
  • FIG. 2 illustrates a cross section of the material spray system 100 defined by box 2 shown in FIG. 1 , according to an aspect of this disclosure.
  • the spray gun 102 further includes a spray body 120 and a bulkhead 122 connected to the spray body 120.
  • the bulkhead 122 can be formed as part of the spray body 120 to form a single unitary part, or the bulkhead 122 can be a separate component that is connected to the spray body 120.
  • the bulkhead 122 is configured to receive an electrode air wash fitting 126 and a pattern air inlet fitting 128.
  • the electrode air wash fitting 126 can connect an electrode air tube to the spray gun 102.
  • the pattern air inlet fitting 128 can connect the air tube 116 to the spray gun 102.
  • the electrode air wash fitting 126 and the pattern air inlet fitting 128 can be threadedly connected to the bulkhead 122. It will be appreciated that the electrode air wash fitting 126 can be connected to the pattern air inlet fitting 128 by other means, including, for example, glue, welding, snap fit, or still other connection means.
  • the bulkhead 122 may have a first inner surface 130 and a second inner surface 132.
  • the first inner surface 130 defines an air inlet channel 134.
  • the air inlet channel 134 is in fluid communication with the air supply 104 via the air tube 116.
  • the second inner surface 132 defines a first portion 136 of a tube receiving channel 140.
  • the spray body 120 has a tube third inner surface 138 that defines a second portion (not labeled) of the tube receiving channel 140.
  • the tube receiving channel 140 extends through the spray gun 102 from a proximal end of the spray gun 102 to a distal end of the spray gun 102 along a spray gun axis A.
  • the bulkhead 122 further includes a hole 144 that extends between the first inner surface 130 and the second inner surface 132.
  • the hole 144 fluidly connects the first portion 136 of the tube receiving channel 140 with the air inlet channel 134.
  • the hole 144 can be formed by, for example, a cross-drill through a wall of the bulkhead 122 and through the air inlet channel 134.
  • the cross-drill can form a second hole (not labeled) on an opposing side of the air inlet channel 134 from the hole 144.
  • the second hole can include a plug 146 to prevent air from escaping from the air inlet channel 134 to an exterior of the bulkhead 122.
  • the hole 144 can include a single hole between the first inner surface 130 and the second inner surface 132.
  • the hole 144 can include plural holes that fluidly connect the first portion 136 of the tube receiving channel 140 with the air inlet channel 134.
  • the second inner surface 132 of the bulkhead 122 defines a groove 150 that extends circumferentially about the spray gun axis A.
  • the groove 150 is recessed within a wall of the bulkhead 122 such that a cross-sectional dimension of the second inner surface 132 proximal to the groove 150 may be less than a cross-sectional dimension of the groove 150, and a cross-sectional dimension of the second inner surface 132 distal to the groove 150 may be less than the cross-sectional dimension of the groove 150.
  • the hole 144 may extend from the first inner surface 130 to the groove 150 defined by the second inner surface 132, thereby fluidly connecting the air inlet channel 134 to the first portion 136 of a tube receiving channel 140 via the hole 144 and the groove 150.
  • FIGS. 3-5 illustrate a perspective view of a material delivery assembly 300, a side view of the material delivery assembly 300, and a cross-sectional view of the material delivery assembly 300 taken along line 5-5 in FIG. 4, respectively, according to aspects of this disclosure.
  • the material delivery assembly 300 is sized and configured to be inserted into the tube receiving channel 140 of the spray gun 102.
  • the material delivery assembly 300 can be removably connected to the spray gun 102, such that the entire implementation of the material delivery assembly 300 can be removed from the spray gun 102 as a single part without disassembling the spray gun 102.
  • the time for maintenance, repair, assembly, disassembly, and/or the like may be reduced.
  • the material delivery assembly 300 extends from a proximal end 302 to a distal end 304 along an assembly axis B.
  • the material delivery assembly 300 may include an inlet adapter 306, an outer tube 308, a transition adapter 310, a material tube 312, and a porous tube 314. It will be appreciated that the material delivery assembly 300 can include fewer or more parts.
  • the proximal end 302 of the of the material delivery assembly 300 is connectable to the air tube 116.
  • the distal end 304 of the material delivery assembly 300 is connectable to the nozzle assembly 112.
  • the distal end 304 can also be connectable to, for example, an electrode assembly or other component used in the process of spray coating.
  • One or more of the connections may be direct connections or there may be one or more intervening components.
  • One or more of the connections may include thread arrangements, press fit arrangements, interference fit arrangements, fastening arrangements, adhesives, and/or the like.
  • the material delivery assembly 300 is removably connected to the spray gun 102 via a seal (not shown) that is installed onto the distal end of the transition adapter 310 into a radial groove or second transition groove 388 (see FIG. 14).
  • This seal has an outer diameter that is greater than the diameter of an outer transition surface 376 of the transition adapter 310. This difference in outer diameter provides a shoulder that is adjacent to another shoulder that is formed in a tube third inner surface 138 (e.g. tube receiving channel) in the spray body 120 of spray gun 102.
  • the material delivery assembly 300 is inserted into the spray gun 102 from the distal end when the spray nozzle assembly 112 has been removed. Installing the spray nozzle assembly 112 onto the spray gun 102 secures the material delivery assembly 300 into the spray gun 102.
  • FIGS. 6-8 illustrate a perspective view of the inlet adapter 306, a side view of the inlet adapter 306, and a cross-sectional view of the inlet adapter 306 taken along line 8-8 in FIG. 7, respectively, according to aspects of this disclosure.
  • the inlet adapter 306 may be connected to a proximal outer tube end 350 of the outer tube 308.
  • the connection may be a direct connection or there may be one or more intervening components.
  • the connection may include barb arrangements, thread arrangements, press fit arrangements, fastening arrangements, interference fit arrangements, adhesives, and/or the like.
  • the inlet adapter 306 extends from a proximal adapter end 320 to a distal adapter end 322 along an adapter axis B’.
  • the inlet adapter 306 has an inner adapter surface 324 and an opposing outer adapter surface 326.
  • the inner adapter surface 324 may extend about the adapter axis B’ through the inlet adapter 306 to define an adapter channel 328.
  • the adapter channel 328 may extend through the inlet adapter 306 from the proximal adapter end 320 to the distal adapter end 322.
  • the inner adapter surface 324 may include a first surface portion 330, a second surface portion 332, and a third surface portion 334.
  • the first surface portion 330 may extend from the proximal adapter end 320 to the second surface portion 332.
  • the second surface portion 332 may extend from the first surface portion 330 to the third surface portion 334.
  • the third surface portion 334 may extend from the second surface portion 332 to the distal adapter end 322.
  • the first surface portion 330 may have a cross-sectional dimension that is less than a cross-sectional dimension of the second surface portion 332.
  • the cross-sectional dimension of the second surface portion 332 may be less than a cross-sectional dimension of the third surface portion 334.
  • first surface portion 330, the second surface portion 332, and the third surface portion 334 can be substantially cylindrical and have respective first, second, and third diameters Di , D2, and D3.
  • the third diameter D3 may be greater than the second diameter D2, and second diameter D2 may be greater than the first diameter Di.
  • the inner adapter surface 324 may further include a receiving body shoulder 336 formed between the first surface portion 330 and the second surface portion 332.
  • the receiving body shoulder 336 can be angularly offset from, such as substantially perpendicular to, the adapter axis B’.
  • the receiving body shoulder 336 can have a conical shape, curved shape, and/or other shape.
  • the second surface portion 332 and the third surface portion 334 may be sized to receive the material tube 312 within the adapter channel 328 such that a proximal material tube end 392 of the material tube 312 contacts and/or abuts the receiving body shoulder 336.
  • the outer adapter surface 326 can include a first adapter groove 338, a second adapter groove 340, and a protrusion 342.
  • the first adapter groove 338 and the second adapter groove 340 may extend circumferentially about inlet adapter 306.
  • the first adapter groove 338 and the second adapter groove 340 may be sized and configured to receive respective O-rings or other seal for forming fluid tight and/or air tight seals.
  • the outer adapter surface 326 protrudes radially outward at the protrusion 342 such that a cross-sectional dimension of the outer adapter surface 326 proximal to the protrusion may be less than a cross-sectional dimension of the protrusion 342, and a cross-sectional dimension of the outer adapter surface 326 distal to the protrusion 342 may be less than the cross-sectional dimension of the protrusion 342.
  • the outer adapter surface 326 further may include a tube connect portion 346.
  • the tube connect portion 346 can include a barb 348 or other structure for retaining the spray material tube or feed hose 110 on the inlet adapter 306.
  • the inlet adapter 306 may define at least one hole 344 positioned between the proximal adapter end 320 and the distal adapter end 322.
  • the at least one hole 344 may extend from the outer adapter surface 326 to the inner adapter surface 324 to fluidly connect the outer adapter surface 326 to the adapter channel 328.
  • the at least one hole 344 may open to the adapter channel 328 at the third surface portion 334.
  • the at least one hole 344 may be positioned axially between the first adapter groove 338 and the protrusion 342.
  • the at least one hole 344 includes a plurality of holes.
  • the plurality of holes can be spaced circumferentially about the inlet adapter 306 equidistant from each of the other plurality of holes.
  • the plurality of holes can also be axially aligned with each of the other plurality of holes.
  • the plurality of holes can be formed by cross-drilling through the inlet adapter. For example, to form two holes of the plurality of holes, a drill can be inserted through a first location on the outer adapter surface 326, pass through the adapter axis B’, and through a second location on the outer adapter surface 326.
  • the two formed holes may be positioned 180° from one another about the adapter axis B’. Additional holes of the plurality of holes can be formed similarly.
  • FIGS. 9-11 illustrate a perspective view of the outer tube 308, a side view of the outer tube 308, and a cross-sectional view of the outer tube 308 taken along line I ll i in FIG. 10, respectively, according to aspects of this disclosure.
  • the outer tube 308 may extend from the proximal outer tube end 350 to a distal outer tube end 352 along an outer tube axis B”.
  • the outer tube 308 may have an inner tube surface 354 and an opposing outer adapter surface 356.
  • the inner tube surface 354 may extend about the outer tube axis B” through the outer tube 308 to define an outer tube channel 358.
  • the outer tube channel 358 may extend through the inlet adapter 306 from the proximal outer tube end 350 to the distal outer tube end 352.
  • the inner tube surface 354 can define an inlet adapter receiving portion 360.
  • the inlet adapter receiving portion 360 may extend from the proximal outer tube end 350 toward the distal outer tube end 352.
  • the inner tube surface 354 of the inlet adapter receiving portion 360 can define progressively decreasing cross-sectional dimensions from the proximal outer tube end 350 toward the distal outer tube end 352.
  • the inlet adapter receiving portion 360 may be sized and configured to receive the inlet adapter 306 at least partially within.
  • the distal adapter end 322 of the inlet adapter 306 may be sized and configured to be received within the inlet adapter receiving portion 360 up until the proximal outer tube end 350 abuts against the protrusion 342 of the inlet adapter 306.
  • the contact between the proximal outer tube end 350 and the protrusion 342 may prevent the inlet adapter 306 from moving further within the outer tube 308 toward the distal outer tube end 352.
  • the outer tube 308 can be fluidly sealed to the inlet adapter by an O-ring 341 (see FIG. 21) or other type of seal positioned within the second adapter groove 340 of the inlet adapter 306.
  • the inner tube surface 354 can further define a transition adapter receiving portion 362.
  • the transition adapter receiving portion 362 is sized and configured to receive the transition adapter 310 at least partially within.
  • the transition adapter receiving portion 362 is configured substantially similar to the inlet adapter receiving portion 360 such that the transition adapter receiving portion 362 is a mirror image of the inlet adapter receiving portion 360 about a center of the outer tube 308 along the outer tube axis B”. It will be appreciated that the transition adapter receiving portion 362 can include other sizes and configurations for connecting to the transition adapter 310.
  • FIGS. 12-14 illustrate a perspective view of the transition adapter 310, a side view of the transition adapter 310, and a cross-sectional view of the transition adapter 310 taken along line 14-14 in FIG. 13, respectively, according to aspects of this disclosure.
  • the transition adapter 310 may be connected to the distal outer tube end 352 of the outer tube 308.
  • the transition adapter 310 extends from a proximal transition end 370 to a distal transition end 372 along a transition axis B’”.
  • the transition adapter 310 may have an inner transition surface 374 and the opposing outer transition surface 376.
  • the inner transition surface 374 extend about the transition axis B’” through the transition adapter 310 to define a transition channel 378.
  • the transition channel 378 may extend through the transition adapter 310 from the proximal transition end 370 to the distal transition end 372.
  • the inner transition surface 374 includes a first surface portion 380 and a second surface portion 382.
  • the first surface portion 380 may extend from the proximal transition end 370 to the second surface portion 382.
  • the second surface portion 382 may extend from the first surface portion 380 to the distal transition end 372.
  • the second surface portion 382 can include a frustoconical interior shape. The frustoconical shape increases in cross-sectional dimension from a proximal end of the second surface portion 382 to the distal transition end 372.
  • the first surface portion 380 can have a cross-sectional dimension that is greater than a cross-sectional dimension of the second surface portion 382 at the proximal end of the second surface portion 382 to define a receiving body shoulder 384 formed between the first surface portion 380 and the second surface portion 382.
  • the receiving body shoulder 384 can be angularly offset from, such as substantially perpendicular to, the transition axis B’”.
  • the receiving body shoulder 384 can have a conical shape, curved shape, or other shape.
  • the first surface portion 380 may be sized and configured to receive the porous tube 314 within the transition channel 378 such that a distal porous end 404 of the porous tube 314 contacts and/or abuts the receiving body shoulder 384.
  • the outer transition surface 376 can include a first transition groove 386, a second transition groove 388, and an outer transition shoulder 390.
  • the first transition groove 386 and the second transition groove 388 may extend circumferentially about transition adapter 310.
  • the first transition groove 386 and the second transition groove 388 may be sized and configured to receive respective O-rings or other seal for forming fluid tight and/or air tight seals.
  • the outer transition shoulder 390 may be positioned on the outer transition surface 376 such that when the transition adapter 310 is connected to the outer tube 308, the distal outer tube end 352 contacts and/or abuts against the outer transition shoulder 390, thereby preventing the transition adapter 310 from sliding toward the proximal outer tube end 350 of the outer tube 308.
  • connection may be a direct connection or there may be one or more intervening components.
  • the connection may include barb arrangements, thread arrangements, press fit arrangements, fastening arrangements, adhesives, interference fit arrangements, and/or the like.
  • FIGS. 15-17 illustrate a perspective view of the material tube 312, a side view of the material tube 312, and a cross-sectional view of the material tube 312 taken along line 17-17 in FIG. 16, respectively, according to aspects of this disclosure.
  • the material tube 312 may extend from the proximal material tube end 392 to a distal material tube end 394 along a material tube axis B””.
  • the material tube 312 may have an inner material surface 396 and an opposing outer material surface 398.
  • the inner material surface 396 may extend about the material tube axis B”” through the material tube 312 to define a material channel 399.
  • the material channel 399 may extend through the material tube 312 from the proximal material tube end 392 to the distal material tube end 394.
  • the material tube 312 may be sized and configured to be positioned within the outer tube channel 358 of the outer tube 308.
  • the material tube 312 can extend from the inlet adapter 306 connected to the proximal outer tube end 350 of the outer tube 308 to the porous tube 314 positioned within the outer tube channel 358 of the outer tube 308.
  • the inner material surface 396 can have an inner cross-sectional dimension D4. In an aspect, the inner cross-sectional dimension D4 is uniform along a length of the material tube from the proximal material tube end 392 to the distal material tube end 394.
  • FIGS. 18-20 illustrate a perspective view of the porous tube 314, a side view of the porous tube 314, and a cross-sectional view of the porous tube 314 taken along line 20-20 in FIG. 19, respectively, according to aspects of this disclosure.
  • the porous tube 314 may be positioned within outer tube channel 358 of the outer tube 308.
  • the porous tube 314 may extend from a proximal porous end 402 to the distal porous end 404 along a porous axis B’””.
  • the porous tube 314 may have an inner porous surface 406 and an opposing outer porous surface 408.
  • the inner porous surface 406 extends about the porous axis B’”” through the porous tube 314 to define a porous channel 410.
  • the porous channel 410 may extend through the porous tube 314 from the proximal porous end 402 to the distal porous end 404.
  • the porous tube 314 can comprise, for example, a plastic material, a synthetic material, a sintered plastic material, and/or the like. It will be appreciated that the porous tube 314 can comprise other materials that allow air to pass through the porous tube 314 from the outer porous surface 408 to the inner porous surface 406 and into the porous channel 410.
  • the porous tube 314 may define a plurality of pores that fluidly connect the outer porous surface 408 with the inner porous surface 406.
  • the inner porous surface 406 may include a first surface portion 412 and a second surface portion 414.
  • the first surface portion 412 may extend from the proximal porous end 402 to the second surface portion 414.
  • the second surface portion 414 may extend from the first surface portion 412 to the distal porous end 404.
  • the first surface portion 412 may have a cross-sectional dimension that is greater than a cross-sectional dimension of the second surface portion 414.
  • the first surface portion 412 and the second surface portion 414 can be substantially cylindrical and have respective first and second diameters Ds and De. The first diameter Ds may be greater than the second diameter De.
  • the inner porous surface 406 further includes a receiving body shoulder 416 formed between the first surface portion 412 and the second surface portion 414.
  • the receiving body shoulder 416 can be angularly offset from, such as substantially perpendicular to, the porous axis B’””.
  • the receiving body shoulder 416 can have a conical shape, curved shape, or other shape.
  • the first surface portion 412 may be sized and configured to receive the material tube 312 within the porous channel 410 such that the distal material tube end 394 of the material tube 312 contacts and/or abuts the receiving body shoulder 416.
  • the outer porous surface 408 may include a radially protruding portion 418 and a radially recessed portion 420.
  • the radially protruding portion 418 may be spaced radially outward from the porous axis B’”” a distance greater than the radially recessed portion 420 is spaced from the porous axis B’””.
  • the protruding portion 418 may be sized and configured to contact the inner tube surface 354 of the outer tube 308. In an aspect, the contact between the protruding portion 418 and the inner tube surface 354 of the outer tube 308 comprises an interference fit.
  • the contact between the protruding portion 418 and the inner tube surface 354 of the outer tube 308 can secure the porous tube 314 within the outer tube 308 such that distal and proximal movement of the porous tube 314 relative to the outer tube 308 is substantially prevented.
  • the protruding portion 418 can include a plurality of radial fins 422.
  • the radial fins 422 can extend from the proximal porous end 402 toward the distal porous end 404.
  • Each of the radial fins 422 can be spaced circumferentially about the porous tube 314 equidistant from each of the other radial fins 422. Spacing each of the radial fins 422 at equal distances from each other can facilitate alignment of porous tube 314 within the inner tube surface 354 of the outer tube 308.
  • FIG. 21 illustrates a close-up view of the material delivery assembly 300 shown in box 21 in FIG. 5
  • FIG. 22 illustrates a close-up view of the material delivery assembly 300 shown in box 22 in FIG. 5.
  • the material delivery assembly 300 can be assembled and/or implemented by inserting the porous tube 314 into the outer tube channel 358 through the distal outer tube end 352 of the outer tube 308.
  • the transition adapter 310 can then be inserted into the outer tube channel 358 through the distal outer tube end 352 of the outer tube 308.
  • the transition adapter 310 can be inserted into the outer tube 308 until the distal outer tube end 352 abuts against the outer transition shoulder 390 of the transition adapter 310.
  • the distal porous end 404 of the porous tube 314 may be inserted into the transition channel 378 through the proximal transition end 370 of the transition adapter 310.
  • the porous tube 314 may be inserted into the transition adapter 310 until the distal porous end 404 abuts against the body shoulder 384 of the transition adapter 310. It will be appreciated that the porous tube 314 and the transition adapter 310 can be connected prior to connecting the porous tube 314 and the transition adapter 310 to the outer tube 308.
  • the material tube 312 may be connected to the porous tube 314 by inserting the material tube 312 through the proximal outer tube end 350 of the outer tube 308 until the distal material tube end 394 of the material tube 312 abuts against the receiving body shoulder 416 of the porous tube 314.
  • the inlet adapter 306 can be connected to the proximal material tube end 392 of the material tube 312 and to the proximal outer tube end 350 of the outer tube 308. It will be appreciated that the inlet adapter 306 and the material tube 312 can be connected prior to connecting the inlet adapter 306 to the outer tube 308.
  • the material tube 312 can be inserted into the inlet adapter 306 until the proximal material tube end 392 of the material tube 312 abuts against the body shoulder 336 of the inlet adapter 306. And the inlet adapter 306 can be inserted into the outer tube 308 until the proximal outer tube end 350 of the outer tube 308 abuts against the protrusion 342 of the inlet adapter 306.
  • a material channel 430 is defined by the first surface portion 330 of the inlet adapter 306 and the inner material surface 396 of the material tube 312.
  • An air and material flow channel 432 is defined by the second surface portion 414 of the porous tube 314 and the second surface portion 382 of the transition adapter 310.
  • the material channel 430 extends through the material delivery assembly 300 from the proximal end 302 to the air and material flow channel 432.
  • the air and material flow channel 432 extends through the material delivery assembly 300 from the material channel 430 to the distal end 304.
  • the first cross-sectional dimension Di of the inlet adapter 306 is substantially similar to the inner cross-sectional dimension D40f the material tube 312.
  • the first cross-sectional dimension Di of the inlet adapter 306 and the inner cross- sectional dimension D40f the material tube 312 can also be substantially similar to the second cross-sectional dimension De of the porous tube 314.
  • the similar cross- sectional dimensions of the inlet adapter 306, the material tube 312 and the porous tube 314 facilitate a uniform flow of material and the combination of material and air through the material delivery assembly 300.
  • the similar cross-section can also facilitate better color change performance of the material delivery assembly 300.
  • the radially recessed portion 420 of the outer porous surface 408 of the porous tube 314 and the inner tube surface 354 of the outer tube 308 define a first air flow channel 440 therebetween.
  • the first air flow channel 440 extends axially from the proximal porous end 402 of the porous tube 314 to the proximal transition end 370 of the transition adapter 310.
  • the first air flow channel 440 further extends circumferentially about the porous tube 314.
  • the first air flow channel 440 is in fluid communication with the air and material flow channel 432 via a pore flow path 433 through the plurality of pores of the porous tube 314.
  • the inner tube surface 354 of the outer tube 308 and the outer material surface 398 of the material tube 312 define a second air flow channel 442 therebetween.
  • the second air flow channel 442 extends axially from the distal adapter end 322 of the inlet adapter 306 to the proximal porous end 402 of the porous tube 314.
  • the second air flow channel 442 further extends circumferentially about the material tube 312.
  • the second air flow channel 442 is in fluid communication with the first air flow channel 440.
  • the third surface portion 334 of the inner adapter surface 324 of the inlet adapter 306 and the outer material surface 398 of the material tube 312 define a third air flow channel 444 therebetween.
  • the third air flow channel 444 extends axially from a distal end of the second surface portion 332 of the inlet adapter 306 to the distal adapter end 322 of the inlet adapter 306.
  • the third air flow channel 444 further extends circumferentially about the inlet adapter 306.
  • the third air flow channel 444 is in fluid communication with the second air flow channel 442.
  • the third air flow channel 444 is also in fluid communication with an exterior of the material delivery assembly 300 via the at least one hole 344 of the inlet adapter 306.
  • the material delivery assembly 300 is inserted into the tube receiving channel 140 of the spray gun 102.
  • the material delivery assembly 300 can be removably connected to the spray gun 102 so that the material delivery assembly 300 can be removed for, for example, maintenance, repair, and replacement.
  • the assembly axis B of the material delivery assembly 300 aligns with the spray gun axis A of the spray gun 102.
  • the material delivery assembly 300 is axially aligned with the spray gun 102 such that the at least one hole 344 of the inlet adapter 306 is in fluid communication with the groove 150 of the bulkhead 122.
  • the air supply 104 is in fluid communication with the first air flow channel 440, the second air flow channel 442, and the third air flow channel 444 of the material delivery assembly 300 via the hole 144 and the groove 150 of the bulkhead and the at least one hole 344 of the inlet adapter 306. With reference to arrows 450 in FIGS. 21 and 22, the air supply 104 supplies air through the at least one hole 344, the third air flow channel 444, the second air flow channel 442, the first air flow channel 440, the pore flow path 433, and into the air and material flow channel 432.
  • the spray material supply 106 is in fluid communication with the material channel 430 of the material delivery assembly 300 via the feed hose 110.
  • the spray material supply 106 supplies the material through the material channel 430 of the material delivery assembly 300 and into the air and material flow channel 432.
  • the air flowing through the plurality of pores of the porous tube 314 along the pore flow path 433 and the material flowing through the material channel 430 are combined in the air and material flow channel 432.
  • the air and material combination flow out of the porous tube 314 and into the transition adapter 310. After flowing through the transition adapter, the air and material combination flow through the nozzle assembly 112 of the spray gun 102.
  • the air and material combination also flows in proximity to the electrode or an electrode assembly such that the air and material combination is in electrical contact with the electrode.
  • the material delivery assembly 300 may relocate the porous tube 314 (e.g. diffuser assembly) closer to the front of the spray gun 102, just behind the electrode support assembly, while still maintaining serviceability of the assembly.
  • Locating the diffuser assembly to the front of the spray gun 102 benefits the customer in the following ways: (1) the ability to use less pattern air to create the fan pattern; (2) improve cleanability of the powder path by decreasing the surface area inside the gun that is in contact with powder downstream of the diffuser assembly; (3) locates the diffuser inside the gun to make the gun more compact; (4) maintains the serviceability of the module assembly.

Landscapes

  • Nozzles (AREA)

Abstract

Un ensemble de tubes de matériau de pulvérisation (312) comprend un tube externe (308) qui définit un canal de tube, et un tube poreux positionné à l'intérieur du canal de tube. Le tube poreux (314) présente une surface poreuse externe, une surface poreuse interne opposée qui définit un canal d'écoulement d'air et de matériau, et une pluralité de pores qui raccordent fluidiquement les surfaces poreuses externe et interne. Une partie radialement évidée du tube poreux (314) et la surface interne du tube externe (308) définissent un premier canal d'écoulement d'air entre elles. Le tube poreux (314) est dimensionné pour y recevoir un tube de matériau, de telle sorte que la surface interne du tube externe (308) et une surface externe du tube de matériau définissent un second canal d'écoulement d'air qui se trouve en communication fluidique avec le canal d'air et de matériau par l'intermédiaire du premier canal d'écoulement d'air et la pluralité de pores du tube poreux (314).
PCT/US2023/061070 2022-01-26 2023-01-23 Dispositif de pulvérisation de poudre et procédé de mise en œuvre WO2023147275A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263303185P 2022-01-26 2022-01-26
US63/303,185 2022-01-26

Publications (1)

Publication Number Publication Date
WO2023147275A1 true WO2023147275A1 (fr) 2023-08-03

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Application Number Title Priority Date Filing Date
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Country Link
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741508A (en) * 1952-05-03 1956-04-10 Columbia Cable & Electric Corp Spray nozzle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741508A (en) * 1952-05-03 1956-04-10 Columbia Cable & Electric Corp Spray nozzle

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