GB2485566A - An air spray gun with a replaceable frontal module - Google Patents

An air spray gun with a replaceable frontal module Download PDF

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Publication number
GB2485566A
GB2485566A GB1019542.8A GB201019542A GB2485566A GB 2485566 A GB2485566 A GB 2485566A GB 201019542 A GB201019542 A GB 201019542A GB 2485566 A GB2485566 A GB 2485566A
Authority
GB
United Kingdom
Prior art keywords
spray gun
needle
liquid
replaceable
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1019542.8A
Other versions
GB201019542D0 (en
Inventor
Robert Mackean Agnew
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1019542.8A priority Critical patent/GB2485566A/en
Publication of GB201019542D0 publication Critical patent/GB201019542D0/en
Publication of GB2485566A publication Critical patent/GB2485566A/en
Withdrawn legal-status Critical Current

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
    • B05B7/24—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
    • B05B7/2429—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 after discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—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
    • B05B7/2478—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
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device

Landscapes

  • Nozzles (AREA)

Abstract

A spray gun which atomises a liquid using a pressurised gas comprises a frontal portion associated with the outlet for the spray, the frontal portion being detachable and replaceable substantially as a modular unit (pictured). The spray gun is envisaged having a handle, flow passages for air 15, 20, 21 and flow passages for paint 9, and a valve arrangement utilising a needle 5 at the outlet. Preferably the entire outlet including the needle valve arrangement is removable. The separable tip ideally comprises a spring 19 biasing the needle 5. More preferably the connection for the liquid supply 9, whether a gravity-fed container or a pressurised hose connection, is integral with the detachable frontal portion of the spray gun. The removable head portion can be disposed of, or be replaced with an equivalent portion. This replaceable nozzle arrangement aims to prevent colour contamination.

Description

ATOMISING APPARATUS
(Spray Gun) This invention relates to an apparatus for atomizing liquids for the spraying of materials and in particular to an improved design which allows for easy changes between different liquids or types and colours of the same liquid.
Background of Invention
Various types of apparatus including those known as spray guns are used for the application of functional or decorative coatings onto components or products. The apparatus directs the liquid through channels usually by means of a pressure differential to a point where it is atomized by mixing with one or more jets of gas or pressurised gas.
When the operation is complete it is necessary for the components parts of the apparatus to be cleaned as the coating material if left will dry or harden and block the channels of the apparatus. This will prevent the apparatus from working and may result in it having to be thrown away.
The normal method of cleaning the apparatus requires the dismantling of some or all of the components and carrying out a length cleaning process. This is time consuming and can result in damage to the more delicate components. The cleaning process also requires the use of solvents which are expensive and can be difficult to dispose of It is often the case that if multiple different types or colours of coatings are to be applied to the same component or product then it is necessary to clean the apparatus being used between each different coating. This is time consuming and for small areas can be costly and difficult to do efficiently. An alternative to repeatedly cleaning one piece of apparatus is to use multiple units however this can be difficult or impossible to do in the cases where the coating has a short shelf life or hardening time.
If the cleaning process if not carried out effectively it can result in subsequent uses of the apparatus being contaminated by particles from the previous use that are not fully cleaned out of the apparatus.
It is therefore the aim of the present invention to provide a means of providing a disposable or more easily cleaned components that can reduce or eliminate the need to clean the fluid areas of the apparatus and so improve the efficiency and flexibility of existing spray guns and similar apparatus.
Description of the Drawings
Fig 1 Shows a longitudinal cross section of a first embodiment of the atomising apparatus as a spray gun Fig 2 Shows a side elevation of a first embodiment of the atomising apparatus as a spray gun with the replaceable element assembly separated from the main handle assembly.
Fig 3 Shows a longitudinal cross section of the replaceable element assembly of a first embodiment of the atomising apparatus as a spray gun Fig 4 Shows a longitudinal cross section of a portion of the replaceable element assembly Fig 5 Shows a side elevation of a second embodiment of the atomizing apparatus as a spray gun
ATOMISING APARATUS -DETAILED DESCRIPTION
In figure 1 is shown a first embodiment of the atomizing apparatus as a spray gun for atomizing liquid and depositing the atomized material as a functional or decorative coating on a variety of products and surfaces.
Fig 1 shows a handle 1 to which is assembled a number of components. Pressurised gas is introduced into the handle by way of a threaded fitting 22 and flows up a channel 2. The flow rate of the gas is controlled by way of an adjustable valve 6.
A manually operated valve 4 operated by way of a trigger 13 or similar actuating lever controls the flow of the gas into the gas conditioning chamber 20.
Apertures in the wall of the gas conditioning chamber 23 allow some of the gas to flow into a secondary chamber, the shaping chamber 21 via a control valve such as a needle valve 8.
Pressurised gas from the gas conditioning chamber 20 can pass freely along the chamber and exit to atmosphere via a peripheral orifice 14. Pressurised gas from the gas conditioning chamber can also enter the pre-atomising chamber 20a from where it can exit by way of a circular orifice 18 or a number of jets around the fluid orifice 24.
Pressurised gas after passing through the shaping control valve 8 enters the shaping chamber 21 from where it can pass through a number of multiple orifices 15 in the spray shaping element 11.
Fluid of the correct viscosity to allow flow is introduced into the fluid inlet 9 either by way of gravity from a container 27 (Fig 2) or injected under pressure (see Fig 5 for a second embodiment). The fluid is prevented from exiting the apparatus by the closure of a needle valve S which is held in place by a spring 19 or similar mechanism.
The needle can be withdrawn from the valve seat 29 (Fig 4) to allow the flow of the fluid. In the first embodiment the apparatus is a manual spray gun so the closing of the trigger 13 serves the function to allow the flow of the pressurized gas by opening valve 4 and then withdrawing the needle S from the needle valve 29 (Fig 4).
The needle is shaped to include a short parallel section 16 at its tip. This allows the use of needles with different diameters of this parallel section to be used with the same fluid tip 10. The resulting different orifice areas between the fluid orifice 30 (Fig 4) and the needle tip 16 allows for easy set up with different fluids or viscosities as only one component, the needle 5, may need to be changed.
The fluid on passing through the needle valve 29 at a quantity depending on the amount that the needle S is withdrawn (flow rate) then comes into contact with the pressurised gas initially exiting from the orifice orjets 18. The impact of the pressurised gas has the effect of an initial atomizing of the liquid. The volume and velocity of the atomized liquid is controlled by the pressure of the gas and the flow rate of the liquid.
The pressurized gas emanating from the circular orifice 14 increases the level of atomisation of the liquid and also forms a "curtain" of pressurised gas around the atomised liquid and gas cone. This circular curtain of pressurised gas reduces the ability of stray particles of atomized liquid from being distributed outside the main atomized cone of liquid and pressurized gas.
The result is that the quantity of atomized liquid that is deposited in the desired areas of the target surface is greater than is normally experienced. This increases the efficiency of the application of the liquid.
The atomized liquid and pressurized gas cone can be shaped by the impinging of multiple jets of pressurized gas from the shaping element 11. Depending on the amount of pressurised gas that is allowed to enter the shaping element 11 by way of the control valve 8 the atomized fluid and pressurized gas cone can be compressed from each side to form a wider thinner fan of atomised liquid and pressurized gas.
A facility is provided in the main handle 1 of the apparatus to allow the monitoring of the pressure inside the pressurized gas conditioning chamber. By way of a vent 17 in the wall of the chamber to the upper exterior surface of the handle 1, a pressure monitoring device can be attached to the handle 1.
This allows the operator to monitor the actual pressure that is being used to atomise the fluid. The pressure monitoring device can be removed easily for cleaning and the vent can be shut with a suitable threaded fastening if it is not required.
On completion of the atomizing task it is necessary to clean the apparatus as the fluid may harden or thicken inside the chambers. Common atomisation equipment such as spray guns require partial or total dismantling and cleaning with suitable solvents sometimes under pressure to remove any liquid residue.
This normally has to be carried out within a short period of otherwise the fluid can go hard with the result that the apparatus is no longer serviceable.
As seen in Fig 2 the front replaceable element assembly 28 of the apparatus can be removed from the handle assembly 26. This is achieved by unlocking the replaceable element assembly 28 by withdrawing the lock pin 25 on the top of the handle assembly 26 and unlocking the needle 5 from the trigger 13.
The replaceable element assembly 28 can then be partially rotated or moved so that it unlocks from the handle assembly 26. The complete replaceable element assembly 28 complete with the needle S and paint reservoir 27 (in the first embodiment) can then be removed.
The Needle valve is held closed by the action of the springl9 or a similar device. This prevents the unused liquid from escaping from the container 27. The container 27 can be removed and sealed for later use if necessary.
Once the container has been removed the replaceable element assembly can be cleaned using a small amount of solvents or cleaning systems such as ultrasonic cleaning which do not require very little or no environmentally unfriendly or expensive solvents.
The replaceable element assembly 28 can be manufactured from low cost mass produced materials.
This allows the removal of the expensive items such as the Needle 5, the fluid tip 10 the shaping element 11 and the retaining ring 12 for reuse as only the needle S and the fluid tip 10 come into contact with the fluid and are very easy to clean.
It can also be manufactured in different colours for different applications It is possible to manufacture the fluid tip, the shaping element and the retaining collar from low cost materials as well, allowing the whole assembly 28 and 27 to be disposable after a few uses. The materials used for these components are likely to be recyclable.
Figures 3 and 4 show a detailed longitudinal cross section of the replaceable element assemble the items numbers of which are the same for the other figures.
Figure 5 shows a second embodiment of the apparatus as would be required for a liquid that is pressure fed into the apparatus instead of using a gravity container.
The first and second embodiments are for manual operation. Additional embodiments are available for automatic and robotic operation using mechanized, electronic, pneumatic and hydraulic actuators and controls.
GB1019542.8A 2010-11-18 2010-11-18 An air spray gun with a replaceable frontal module Withdrawn GB2485566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1019542.8A GB2485566A (en) 2010-11-18 2010-11-18 An air spray gun with a replaceable frontal module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1019542.8A GB2485566A (en) 2010-11-18 2010-11-18 An air spray gun with a replaceable frontal module

Publications (2)

Publication Number Publication Date
GB201019542D0 GB201019542D0 (en) 2010-12-29
GB2485566A true GB2485566A (en) 2012-05-23

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Family Applications (1)

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GB1019542.8A Withdrawn GB2485566A (en) 2010-11-18 2010-11-18 An air spray gun with a replaceable frontal module

Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2529754A (en) * 2014-08-12 2016-03-02 Jim Lindsay Ltd Spray gun
FR3040006A1 (en) * 2015-08-14 2017-02-17 Renault Sa APPARATUS FOR APPLYING A PRIMARY COVER ON THE GLASS OF A MOTOR VEHICLE
US10786824B2 (en) 2015-06-26 2020-09-29 Jim Lindsay Ltd. Spray gun

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4213826A1 (en) * 1991-05-08 1992-11-12 Walther Spritz Lackiersyst Spray gun for print - has closed nozzle pin tip, spring-loaded on sealing seat in spray nozzle, to block spray material
DE4302911A1 (en) * 1992-02-03 1993-08-05 Minari Co Spray gun for paint,etc - has one-piece disposable opening - closing valve and branch tube, held in place by cap nut
DE19503495A1 (en) * 1995-02-03 1996-08-08 Amv Autom Montage Vertrieb Fa Spray gun with removable nozzle part
US6267302B1 (en) * 1999-05-17 2001-07-31 David Clark Huffman Spray gun with rolling wall diaphragm and quick disconnect housing
EP1340550A2 (en) * 2002-03-01 2003-09-03 J. Wagner GmbH Spray gun
EP1479447A1 (en) * 2003-05-23 2004-11-24 Walther Spritz- und Lackiersysteme GmbH Modular spray gun

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4213826A1 (en) * 1991-05-08 1992-11-12 Walther Spritz Lackiersyst Spray gun for print - has closed nozzle pin tip, spring-loaded on sealing seat in spray nozzle, to block spray material
DE4302911A1 (en) * 1992-02-03 1993-08-05 Minari Co Spray gun for paint,etc - has one-piece disposable opening - closing valve and branch tube, held in place by cap nut
DE19503495A1 (en) * 1995-02-03 1996-08-08 Amv Autom Montage Vertrieb Fa Spray gun with removable nozzle part
US6267302B1 (en) * 1999-05-17 2001-07-31 David Clark Huffman Spray gun with rolling wall diaphragm and quick disconnect housing
EP1340550A2 (en) * 2002-03-01 2003-09-03 J. Wagner GmbH Spray gun
EP1479447A1 (en) * 2003-05-23 2004-11-24 Walther Spritz- und Lackiersysteme GmbH Modular spray gun

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2529754A (en) * 2014-08-12 2016-03-02 Jim Lindsay Ltd Spray gun
US10195620B2 (en) 2014-08-12 2019-02-05 Jim Lindsay Ltd. Spray gun apparatus
GB2529754B (en) * 2014-08-12 2020-04-01 Jim Lindsay Ltd Spray gun
US10786824B2 (en) 2015-06-26 2020-09-29 Jim Lindsay Ltd. Spray gun
FR3040006A1 (en) * 2015-08-14 2017-02-17 Renault Sa APPARATUS FOR APPLYING A PRIMARY COVER ON THE GLASS OF A MOTOR VEHICLE

Also Published As

Publication number Publication date
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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)