Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/02—Spray pistols; Apparatus for discharge
  • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
  • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
  • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
  • B05B7/068—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet the annular gas outlet being supplied by a gas conduit having an axially concave curved internal surface just upstream said outlet
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
  • B05B15/60—Arrangements for mounting, supporting or holding spraying apparatus
  • B05B15/65—Mounting arrangements for fluid connection of the spraying apparatus or its outlets to flow conduits
• • 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
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
  • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
  • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
  • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
  • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice

Definitions

• the present invention concerns a painting gun, in particular a spray gun provided with an improved nozzle.
• the known painting systems usually comprise at least one painting gun configured to spray a painting fluid onto an object to be painted.
• Said gun which is a spray gun, therefore comprises an opening for the outflow of said painting fluid, usually pressurized, directed towards the object to be painted.
• the painting fluid coming from the nozzle is mixed with pressurized air, channelled between the nozzle and a spray head, to allow spraying towards the object to be painted.
• the known systems have multiple problems due to non-optimal mixing of the painting fluid with the pressurized air. Said non-optimal mixing affects the painting quality.
• the object of the present invention is to meet the above needs in an optimized inexpensive manner.
• Figure 1 illustrates a portion of a painting system 1 comprising at least one painting assembly 2 each provided with a painting gun 3.
• the figure illustrated shows a single painting assembly 2, for the sake of simplicity.
• the painting gun 3 extends along a longitudinal axis A.
• the painting gun 3 defines a casing 4, preferably cylindrically shaped and configured to delimit an inner space 5 adapted to house a flow regulation system 6 for regulating the painting fluid as described below.
• the flow regulation system 6 comprises a rod 7 configured to open or close the free section of an opening 8, preferably defined as outlet section of a nozzle assembly 9.
• the opening 8 is fluidically connected to the inner space 5 and to a painting fluid source, as known per se.
• the rod 7 is connected to adjustment means (not illustrated) configured to adjust the maximum vertical position of travel along the axis A of said rod 7 as described below.
• the rod 7 further comprises a main body 7' and a tip 7" extending from the main body 7' and configured to selectively cooperate in contact with the opening 8 as described below.
• the nozzle assembly 9 essentially comprises a nozzle 10 and a spray head 11 fixed to the casing 4 as better described below.
• nozzle 10 (illustrated externally in figures 2 and 3 and internally in figures 5 and 6 ) it essentially comprises a hollow tubular body along the axis A - i.e. defining an inner space 10e - provided with a coupling portion 10a configured to allow coupling of the nozzle relative to the casing 4 and an end portion 10b extending axially along the axis A on the opposite side of the coupling portion 10a and defining the opening 8.
• the coupling portion 10a advantageously comprises a threaded portion adapted to cooperate with a respective threaded portion provided in the space 5.
• Inner space 10e is therefore fluidly connected to space 5, i.e. to source of painting fluid.
• the nozzle 10 further comprises a plurality of cantilevered portions 10c, in particular four cantilevered portions 10c, extending from the hollow tubular body, advantageously at the connection between the end portion 10b and the coupling portion 10a, relative to the longitudinal extension along the axis A of the nozzle 10.
• the cantilevered portions 10c comprise a portion 10c' radial to the hollow tubular body and extending perpendicular to the axis A from the outer surface of the latter and an axial portion 10c" extending parallel to the longitudinal axis A starting from the radial ends of the end portions 10b.
• the axial portion 10c" has a substantially triangular shape where one outer side is substantially parallel to the longitudinal axis A and one inner side is inclined relative to the axis A. In particular, said side is inclined so as to increase the radial distance relative to the end portion 10b being closer in the direction of the opening 8.
• the cantilevered portions 10c in particular the radial portions 10c', are perpendicular to one another and coupled by a radius of approximately 10mm to the hollow tubular body of the nozzle 10 where preferably the centre of said radius belongs to the outer perimeter of the cantilevered portions 10c.
• the nozzle 10 further comprises a gripping portion 10d extending between the end portion 10b and the cantilevered portions 10c and having a substantially polygonal shape, such as hexagonal, adapted to be coupled to a gripping element adapted for the purpose.
• the end portion 7' of the rod 7 has a substantially conical shape, advantageously with cone angle of 21° relative to the longitudinal axis A.
• the end portion 10b has a tapered shape tapering from the coupling portion 10a towards the opening 8 where it has minimum diameter.
• it has a substantially conical shape, advantageously frustoconical.
• the end portion 10b defines in the inner space 10e a cylindrical hollow end portion 15 defining at one end the opening 8 and a conical hollow portion 16 connected to an end in continuity with the hollow end portion 15.
• the hollow end portion 15 advantageously has a diameter greater than the smaller diameter of the end portion 7" of the rod 7.
• the conical hollow portion 16 advantageously has a cone angle of 24°.
• the spray head 11 comprises a coupling portion 11a configured to cooperate with the casing 4 to allow coupling of the spray head 11 to the casing 4.
• the coupling portion 11a is coupled to the casing 4 by means of a ring nut 20 adapted to lock the coupling portion 11a to the casing 4.
• the spray head 11 comprises a main body having substantially hollow and annular shape so as to be housed around the nozzle 10 coaxially to the axis A.
• it defines an opening 21, advantageously coaxial with the opening 8 from an end portion 11b opposite to the coupling portion along the axis A.
• the spray head 11 also defines a protuberance 11c extending longitudinally along the axis A beyond the end portion 11b and extending circumferentially, at least partially, around the axis A so as to delimit a space 22 facing the opening 21.
• the protuberance 11c further defines a plurality of channels 23 fluidically connected to a source of pressurized air connected by means of appropriate ducts provided in the casing 4 to the channels 23.
• the latter are configured to introduce said pressurized air into the space 22, namely towards the openings 8 and 21.
• the spray head 11 defines cooperation portions 11d configured to be facing the axial portions 10c" of the cantilevered portions 10c of the nozzle 10 and cooperate in contact with them.
• the cooperation portions 11d have a circular, advantageously spherical, shape preferably with radius of 16 mm, relative to those of the inclined wall of the axial portion 11c" of the cantilevered portions 11c. In this way, the cooperation portions 11d and the cantilevered portions 11c are in contact along a contact circumference between the spray head 11 and the nozzle 10.
• the main body of the spray head 11 defines with the nozzle 10 a chamber 25 axially delimited along the axis A on one side by the end portion 10b of the nozzle 10 and communicating with the source of pressurized air by means of the lobed openings 13, on the opposite side axially delimited by the end portion 11b and communicating with the outside via the opening 21 and radially delimited by part of the cantilevered portions 10c of the nozzle 10 and the main body of the spray head.
• the main body of the spray head 11 defines a chamber 25 having substantially spherical shape centered on the longitudinal axis A, advantageously with radius of approximately 10mm.
• the nozzle 10 extends along the axis A so that the openings 8 of the nozzle 10 and the opening 21 of the spray head are at the same distance along the axis A, namely contained in the same plane.
• the pressurized air flows from the lobed openings 13 into the chamber 25 and out of the opening 21.
• the pressurized air flows from the ducts 23 towards the space 22.
• the painting fluid is sprayed in the same space, passing through the opening 8. In particular, coming from the space 5, it passes ( figure 5 ) between the tip 7" and the conical 16 and cylindrical 15 portions, accelerating and flowing out of the opening 8.
• Optimal mixing of the painting mixture is obtained in the space 22 due to the high speeds reached by the pressurized air and the painting fluid.
• the pressurized air flows in large quantities into the space 25, aiding mixing with the painting fluid.
• the cantilevered portions 10c cooperate with the spray head 11 so as to centre it, facilitating assembly of the spray gun 2.
• the spherical shape of the main body of the spray head substantially spherical, improves channeling of the pressurized air flow towards the opening 21.

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• 2022
  • 2022-07-18 IT IT102022000015067A patent/IT202200015067A1/it unknown
• 2023
  • 2023-07-17 EP EP25209526.0A patent/EP4656295A3/de active Pending
  • 2023-07-17 EP EP23185792.1A patent/EP4309800B1/de active Active

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