WO2025199571A1 - Appareil de distribution de fluide - Google Patents

Appareil de distribution de fluide

Info

Publication number
WO2025199571A1
WO2025199571A1 PCT/AU2025/050284 AU2025050284W WO2025199571A1 WO 2025199571 A1 WO2025199571 A1 WO 2025199571A1 AU 2025050284 W AU2025050284 W AU 2025050284W WO 2025199571 A1 WO2025199571 A1 WO 2025199571A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
airflow
passage
nozzle
delivery unit
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.)
Pending
Application number
PCT/AU2025/050284
Other languages
English (en)
Inventor
Andrew King
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
2 Drbh Pty Ltd
Original Assignee
2 Drbh Pty Ltd
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
Priority claimed from AU2024900828A external-priority patent/AU2024900828A0/en
Application filed by 2 Drbh Pty Ltd filed Critical 2 Drbh Pty Ltd
Publication of WO2025199571A1 publication Critical patent/WO2025199571A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0081—Apparatus supplied with low pressure gas, e.g. "hvlp"-guns; air supplied by a fan
    • 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
    • B05B1/3013—Lift valves
    • 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
    • B05B7/0081—Apparatus supplied with low pressure gas, e.g. "hvlp"-guns; air supplied by a fan
    • B05B7/0087—Atmospheric air being sucked by a gas stream, generally flowing through a venturi, at a location upstream or inside 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
    • B05B7/0869—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 the liquid or other fluent material being sucked or aspirated from an outlet orifice by another fluid, e.g. a gas, coming from another outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1209—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means for each liquid or other fluent material being manual and interdependent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
    • B05B7/2408—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle characterised by the container or its attachment means to the spray 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
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
    • B05B7/2416—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle characterised by the means for producing or supplying the atomising fluid, e.g. air hoses, air pumps, gas containers, compressors, fans, ventilators, their drives
    • B05B7/2418—Air pumps actuated by the operator, e.g. manually actuated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
    • B05B7/2435—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle the carried liquid and the main stream of atomising fluid being brought together by parallel conduits placed one inside the other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2478—Gun with a container which, in normal use, is located above the gun
    • 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

Definitions

  • the present invention relates to apparatus for dispensing fluids, such as for example liquids or aerosols including paint, sealers, primers, lacquers and other flowable substances such as powders.
  • fluids such as for example liquids or aerosols including paint, sealers, primers, lacquers and other flowable substances such as powders.
  • the present invention relates to apparatus for dispensing paints of the type for example used in industries including automotive, marine, industrial chemicals, wood working and construction.
  • the apparatus may have applications for painting and surface coati ng/treatment in various fields of technology.
  • Aerosol paint (commonly known as spray paint) is paint that comes in a sealed, pressurised can, and is released in an aerosol spray when a valve button is pressed. Spray paint cans are not refillable, and they are discarded once the paint has been used.
  • Propellants such as di-methyl ether or a mixture of propane and butane are commonly used in aerosol cans to provide a pressure force to void the contents of the can when the valve or nozzle is activated.
  • aerosol paints may release volatile organic compounds and other pollutants (such as formaldehyde, benzene, and lead) to the atmosphere.
  • Aerosol spray cans are commonly used in small scale applications, such as automotive touch-ups. Aerosol cans are not normally used for larger projects, such as entire vehicle bodywork painting, which is normally performed with specialised spraying equipment. This is primarily due to the limited quality provided by the built in nozzle, which may limit the quality of the paint finish. Furthermore, aerosol spray cans are cost prohibitive when used on large scare applications.
  • pneumatic spray guns In contrast to aerosol spray cans, pneumatic spray guns use compressed air or other gases, normally provided by an air compressor (or other source) to mix air with the paint so the paint becomes aerosolised and atomised which assists the paint to be sprayed and applied to a workpiece.
  • air compressor or other source
  • Conventional air spray guns require a high amount of pressure.
  • conventional spray guns are normally used for larger projects.
  • One aspect of conventional spray gun systems is that the nozzle and the paint pot are permanent components of the gun, and they must be thoroughly cleaned between colours and/or at the end of a paint run, to prevent the nozzle becoming blocked, and to ensure there is no colour contamination with subsequently run colours.
  • the air source normally in the form of a compressor, provides drawbacks in the form of additional noise and the operator must carefully manage the air hose when moving about the workspace. Similarly, with electric turbine spray guns, the operate must carefully manage the power cable.
  • the present invention provides a fluid delivery unit for use in fluid dispensing apparatus, the apparatus comprising: a main dispenser body, having an air flow chamber therein; an air discharge port in an end wall of the main dispenser body and through which an airflow can be discharged from the airflow chamber; an airflow generator for generating an airflow stream from the airflow chamber through the discharge port in an airflow stream direction;
  • the fluid delivery unit being adapted to be releasably mountable to the main dispenser body in an installed position, and including: a fluid holding receptacle; a fluid feed passage through which fluid can be discharged from the fluid holding receptacle; a nozzle fixedly secured to the fluid holding receptacle, so as to provide for a unitary structure; the nozzle, including a proximal end, adjacent the discharge port when in the installed position, a distal end, a nozzle outlet and a fluid transfer passage arrangement, which includes an airflow passage in fluid communication with the discharge port,
  • the fluid feed passage being in fluid communication with the fluid transfer passage arrangement.
  • the fluid feed passage is in fluid communication with the fluid transfer passage arrangement in a fluid junction region adjacent the proximal end of the nozzle.
  • the fluid transfer passage arrangement is unobstructed from the junction region to the nozzle outlet.
  • the fluid transfer passage arrangement is configured, so as to draw fluid from the fluid holding receptacle into the fluid transfer passage arrangement in response to the travel of the airflow stream through the nozzle airflow passage.
  • the nozzle airflow passage includes a reduced pressure zone in which a low pressure is produced relative to upstream of the reduced pressure zone as a result of the airflow stream as it travels along the airflow passage, the fluid feed passage being in fluid communication with the reduced pressure zone.
  • the airflow passage has a cross-sectional dimension in the reduced pressure zone, which is less than the cross-sectional dimension of the airflow passage upstream thereof.
  • the fluid transfer arrangement includes a fluid transfer passage which is in fluid communication with the fluid feed passage.
  • the airflow passage and the fluid transfer passage are provided by a common passageway configured to transfer the airflow stream and flow from the fluid receptacle via the fluid feed passage towards the nozzle outlet.
  • the reduced pressure zone is provided by a venturi within the airflow passage.
  • the fluid transfer passage and airflow passage are separate passageways along their length, the passageways at least in part tapering towards the distal end at which the passages are in fluid communication in a mixing region which provides for the low pressure zone.
  • the nozzle comprises an elongated body having an outer sidewall with a longitudinal axis extending between the ends.
  • the fluid feed passage extends through the sidewall of the nozzle body, so as to be in fluid communication with the fluid transverse arrangement.
  • the locking nut is configured to engage the radially outer surface of the nozzle to urge the nozzle toward the body member when the locking nut is tightened.
  • an air and fluid feed tube extends between the internal conically tapering passage and the fluid holding receptacle.
  • Figure 1 is a side view of a first embodiment of apparatus according to the invention.
  • Figure 2 is a cross-sectional side view of the apparatus of Figure 1 ;
  • Figure 2A is a detail of part of the apparatus shown in Figure 2;
  • Figure 3 is a bottom perspective view of the part of the apparatus shown in Figure 1 ;
  • Figure 4 is a side view of the part of the apparatus shown in Figure 3;
  • Figure 5 is an exploded perspective view of the apparatus shown in of Figure 1 ;
  • Figure 6 is a side view of the part of the apparatus shown in Figure 3;
  • Figure 7 is a bottom, front perspective view of the part of the apparatus shown in Figure 3;
  • Figure 8 is a bottom, rear perspective view of the part of the apparatus shown in Figure 3;
  • Figure 9 is a side view of a second embodiment of apparatus according to the invention.
  • Figure 10 is a cross-sectional side view of the apparatus shown in of Figure 9;
  • Figure 10B is a detail of part of the apparatus shown in Figure 10.
  • FIG. 1 A first embodiment is shown in Figures 1 to 8, and a second embodiment is shown in Figures 9 to 11.
  • the apparatus will hereinafter be described in the context of a paint dispenser It will be appreciated however that it that it may be used for dispensing any industrial liquid intended for example for spraying, such as sealers, primers, lacquers and other flowable substances.
  • the apparatus 100 comprises two main parts namely a main dispenser body part 105 and a fluid delivery unit 205.
  • the apparatus 100 is provided in a spray gun format with the main dispenser body 105 including a hand grip portion 110 and a trigger 120 which may for example be position sensitive. This permits the main body 105 to be ergonomically held and operated in one hand.
  • the fluid delivery unit 205 is mountable to the main dispenser body 105 in an installed position and includes a fluid holding receptacle 200 and a nozzle 300.
  • the receptacle 200 is provided within a pre-mixed ready to use consumable, single use unit 205 comprising the receptacle 200 and an attached nozzle 300.
  • a user purchases a receptacle 200 from a vendor such as a paint vendor
  • the receptacle 200 is provided with the nozzle 300 already attached.
  • the apparatus 100 does not have a permanent and reusable nozzle, and a new nozzle 300 is used with each new receptacle 200. This significantly reduces the risk of paint contamination across successive jobs, and reduces cleaning time.
  • the entire paint unit 205 can be discarded and/or recycled.
  • the nozzle 300 may be reusable after cleaning, or returned to the manufacturer for cleaning and subsequent reuse.
  • the main dispenser body 105 has an air flow chamber 155 therein, an air discharge port 107 in an end wall 109 of the main dispenser body 105 through which an airflow can be discharged from the airflow chamber 155.
  • An airflow generator 145 for generating an airflow stream from the airflow chamber 155 through the discharge port 107 in an airflow stream direction is located within the chamber 155.
  • the end wall 109 has an internal wall 111 which tapers towards the discharge port 107.
  • the airflow generator may be in the form of an impeller 158 driven by motor 150.
  • the fluid delivery unit 205 is releasably mountable to the main dispenser body 105 in an installed position, and includes a fluid holding receptacle 200, a fluid feed passage 337 through which fluid, in the example embodiment described is paint can be discharged from the fluid holding receptacle 200.
  • the nozzle 300 is fixedly secured to the fluid holding receptacle 200, so as to provide for a unitary structure. As shown in figures 3 and 4 the nozzle 300, includes a proximal end 302, adjacent the discharge port 107 when in the installed position, a distal end 304, and a nozzle outlet 320.
  • a fluid transfer passage arrangement 375 which includes an airflow passage 376 is in fluid communication with the discharge port 107.
  • the fluid feed passage 337 is in fluid communication with the fluid transfer passage arrangement 375.
  • the nozzle 300 when in the installed position is disposed wholly externally of the airflow chamber 155 and main dispenser body 105.
  • the fluid feed passage 337 is in fluid communication with the fluid transfer passage arrangement 375 at a fluid junction region 377 adjacent the proximal end 302 of the nozzle 300.
  • the fluid transfer passage arrangement 375 is unobstructed from the junction region 377 to the nozzle outlet 320.
  • the fluid transfer passage arrangement 375 is configured, so as to draw fluid from the paint holding receptacle 200 into the fluid transfer passage arrangement 375 in response to the flow of the airflow stream through the nozzle airflow passage 376.
  • the fluid transfer passage arrangement 375 comprises a single passage which provides for the airflow passage 376 and a fluid transfer passage 380.
  • the nozzle airflow passage 376 includes a reduced pressure zone 334 in which a low pressure is produced relative to upstream of the reduced pressure zone 334 as a result of the airflow stream as it travels along the airflow passage 376, the fluid feed passage 337 being in fluid communication with the reduced pressure zone 334.
  • the airflow passage 376 has a cross-sectional dimension in the reduced in the reduced pressure zone 334, which is less than the cross-sectional dimension of the airflow passage 376 upstream thereof. As shown in figure 2A the reduced pressure zone is provided by a venturi 360.
  • the nozzle 300 comprises an elongated body 311 having an outer sidewall
  • the fluid feed passage 377 extends through the sidewall 312 of the nozzle body 311 , so as to be in fluid communication with the fluid transverse arrangement 375.
  • the longitudinal axis X-X is substantially aligned with the airflow stream from the discharge port 107 and the airflow generator 145.
  • the main dispenser body 105 includes a mounting arrangement 160 for releasably mounting the paint delivery unit 205 to the main body.
  • the mounting arrangement 160 includes a trough shaped support member 166 which extends from the end wall 109 of the main body 105 adjacent the discharge port 107 and terminates at an outer end 167, the support member 166 being shaped so as to receive a complementary shaped portion of the nozzle body 311 therein, the mounting arrangement further including a recessed retaining member 175 configured to overlie the nozzle body 311 , when in the installed position and a locking member 340 configured to releasably hold the support member 160 and retaining member 175 together.
  • the valve stem 335 extends through the nozzle 300 and through an aperture 168 in trough shaped support member 165.
  • the valve stem 335 has an outer end which is in engagement with the actuator.
  • the outer end wall of the nozzle body has a tapering cross-section such that an external cross-section nozzle body decreases toward nozzle outlet.
  • batteries 130 are depicted within the grip portion 110, it will be appreciated that the batteries 130 may alternatively be housed elsewhere within the spray gun 100.
  • the batteries 130 may be rechargeable and/or replaceable.
  • the batteries 130 may be housed in a removable cartridge enabling the cartridge (not shown) to be swapped out for recharging, to minimise downtime by cycling two or more like cartridges.
  • the batteries 130 are in electric communication with a control unit 185 which controls the power delivery to the motor 150.
  • the control unit 155 switches on the variable voltage DC power supply to the electric motor 150.
  • the position sensitive trigger 120 enables the operator to control the motor speed between high and low rotational speeds, and intermediate speeds. This may be used to alter the paint spraying properties.
  • the stem 335 is moved upwardly, and the valve 330 is opened.
  • the valve 330 is spring biased toward a closed position, and automatically closes when the operator releases the trigger 120. The further the trigger 120 is depressed, the more the valve 330 is opened.
  • the valve is seated in a passage 337 which extends between the receptacle 200 and the nozzle 300.
  • the electric motor 150 is an ultra-high RPM brushless variable speed DC motor capable of rotating at high speeds up to 100,000 rpm in order to generate significantly increased down-stream air pressure.
  • the air inlet 170 has a filter and/or perforated screen to protect the impellor blades of the impeller 158 and the electric motor 150, and to reduce the likelihood of particulate matter or other contaminants being mixed with the paint.
  • the electric motor 150 is housed in the airflow chamber 155 which tapers to a reduced cross-section toward the nozzle 300.
  • the airflow chamber 155 has a largest cross-sectional area at or near the electric motor 150, to permit the air to move around he motor 150, and the airflow chamber 155 gradually tapers into a venturi 360 with a smallest cross-sectional area located at or near the interface where the valve stem 335 is seated in the passage 335.
  • the airflow chamber 155 is fluidly coupled to the upstream end of the nozzle 300. Coupling may be achieved by a taper-seal, male and female threads, a bayonet fitting, an abutting seal with a rubber gasket, or another hermetic coupling configured to prevent leakage of the pressurised air or paint.
  • the radially external surface of the nozzle 300 which is closest to the nozzle outlet 320 is tapered, so that tightening the locking nut 340 urges the nozzle 300 and receptacle 200 to move axially toward the motor 150, until a hermetic seal is achieved between the nozzle 300 inlet 310 and the air flow chamber 155.
  • the locking nut 340 is depicted as a round tapering and truncated conical member, and the internal surface is also partially tapering.
  • the external surface may alternatively be provided with a pair of parallel machined faces for engagement with a spanner, or hexagonal faces. Alternatively, it may have a knurled surface texture for improved hand grip.
  • the locking nut 340 and the semi-tubular channel 165 and semi-tubular collar 175 allow the paint assembly 210 to be quickly secured to the spray gun 100 or removed from the spray gun 100.
  • the nozzle 300 is fitted to the apparatus 100 by securing the semi-tubular channel 165 to the semi-tubular collar 175 and securing by fastening the locking nut 340.
  • the motor 150 spins the output shaft which is coupled to a fan impellor 170.
  • the fan impellor 170 and motor 150 together define an air pump and the fan impellor 170 draws air into the air inlet 160.
  • actuation of the trigger also opens the valve 330, permitting the fluid to exit from the pot 200.
  • the tube 220 extending upwardly inside the pot 200 allows air to enter the pot 200 to offset the volume occupied by the dispensed paint. This permits the paint to flow freely when the valve 330 is open.
  • the air passes through the airflow chamber 155 and into the nozzle 300.
  • the venturi 360 causes the air to accelerate.
  • the increased air velocity in the venturi 360 creates an area of low pressure and draws the paint out of the pot 200.
  • the valve 330 may be delayed in opening such that it remains closed until the motor 150 and impellor fan blade 170 speed ramps up to a predetermined RPM. This has the effect of regulating the starting spray pressure, so it starts with a spray not a dribble, resulting in improved spray consistency.
  • the fluid transfer passage arrangement 375 includes a separate fluid transfer passage 380, which is in fluid communication with the paint feed passage 337, the fluid transfer passage 380 and the airflow passage 376, at least in part tapering towards the distal end 304 at which the passages are in fluid communication in a mixing region 382 defining the low-pressure zone 378.
  • the fluid flow passage within the nozzle 300 is conical and tapers from a maximum diameter at the proximal nozzle inlet, in the form of the interface 310 with the airflow chamber 155 toward a minimum diameter at the distal nozzle outlet 320.
  • the nozzle outlet 320 may be sized to optimise the specific spray requirements of the particular paint can 200 to which it is attached. For example, a waterbased paint pot 200 may be supplied with a smaller nozzle outlet 320, whilst a more viscous enamel-based paint may be supplied with a larger diameter nozzle outlet 320.
  • the nozzle 300 the fluid transfer passage is a central passage 380, which tapers conically toward the nozzle outlet 320.
  • the central passage 380 is in fluid communication with the valve 330.
  • the nozzle 300 also includes a radially outer air flow passage 385 which is disposed annually around the central passage 380.
  • the spray gun 100 may have a gauge to indicate the air pressure within the pot 200.
  • the paint can or pot 200 and nozzle 300 are disposable. This obviates the need to clean the nozzle 300 and pot 200 with hazardous solvents, which are required for conventional spray guns, and this also removes the risk of paint contamination from one batch to the next.
  • the spray gun 100 obviates the need for the operator to manage an air or power cable which can result in air/power line snags and reduces work productivity and quality.
  • like numerals are used to identify similar features, except where expressly otherwise indicated.

Landscapes

  • Nozzles (AREA)

Abstract

Un appareil de distribution de fluide (100) comprend un élément de corps distributeur principal (105) ayant une chambre d'écoulement d'air interne (155). Un moteur électrique (150) est logé à l'intérieur de la chambre d'écoulement d'air (155). Une unité de distribution de fluide amovible (205) comprend un réceptacle (200) et une buse de peinture (300) fixée. Une batterie (130) est conçue pour fournir de l'électricité au moteur électrique (150), le moteur électrique (150) étant conçu pour pomper de l'air à travers la chambre d'écoulement d'air (155) dans une extrémité proximale de la buse (300).
PCT/AU2025/050284 2024-03-27 2025-03-24 Appareil de distribution de fluide Pending WO2025199571A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2024900828A AU2024900828A0 (en) 2024-03-27 Paint dispensing device
AU2024900828 2024-03-27

Publications (1)

Publication Number Publication Date
WO2025199571A1 true WO2025199571A1 (fr) 2025-10-02

Family

ID=97218171

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2025/050284 Pending WO2025199571A1 (fr) 2024-03-27 2025-03-24 Appareil de distribution de fluide

Country Status (1)

Country Link
WO (1) WO2025199571A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180050355A1 (en) * 2015-03-05 2018-02-22 Axalta Coating Systems Ip Co., Llc Spray gun with a hollow needle to assure gravity feed and method for use thereof
US20230356244A1 (en) * 2022-05-03 2023-11-09 Wagner Spray Tech Corporation Compact air-driven fluid sprayer with replaceable cartridge assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180050355A1 (en) * 2015-03-05 2018-02-22 Axalta Coating Systems Ip Co., Llc Spray gun with a hollow needle to assure gravity feed and method for use thereof
US20230356244A1 (en) * 2022-05-03 2023-11-09 Wagner Spray Tech Corporation Compact air-driven fluid sprayer with replaceable cartridge assembly

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