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EP0191766A1 - A process for use with a spraying nozzle, and an arrangement for carrying out the process - Google Patents

A process for use with a spraying nozzle, and an arrangement for carrying out the process

Info

Publication number
EP0191766A1
EP0191766A1 EP84904195A EP84904195A EP0191766A1 EP 0191766 A1 EP0191766 A1 EP 0191766A1 EP 84904195 A EP84904195 A EP 84904195A EP 84904195 A EP84904195 A EP 84904195A EP 0191766 A1 EP0191766 A1 EP 0191766A1
Authority
EP
European Patent Office
Prior art keywords
powder
outlet
air
arrangement
air supply
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Withdrawn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
EP84904195A
Other languages
German (de)
French (fr)
Inventor
Jan Ruud
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.)
ICAB INDUSTRIAL COATING AB
Original Assignee
ICAB INDUSTRIAL COATING AB
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 ICAB INDUSTRIAL COATING AB filed Critical ICAB INDUSTRIAL COATING AB
Publication of EP0191766A1 publication Critical patent/EP0191766A1/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Withdrawn legal-status Critical Current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
    • B05B7/2486—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 with means for supplying liquid or other fluent material to several discharge devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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

Definitions

  • the present invention relates to a process for delivering grains of powder charged in an electrostatic charging arrangement by friction charging in curved elongated ducts made from electrically non-conducting material.
  • the main object of the present invention is firstly to provide a process of the above-mentioned kind which makes it possible to convey and deliver charged grains of powder effectively to a location a considerable distance from the delivery unit in order to reach into deeply disposed corners and other deep-lying parts of cupboards, girders, etc., for example, which it is desired to coat with charged powder, especially colouring powder, where at the same time it is desired that an even coating thickness also be obtained.
  • the said object is achieved by means of the process according to the present invention.
  • a further object of the invention is to provide an arrangement which may be used to carry out the process according to the invention.
  • the said further object is achieved by means of an arrangement according to the present invention.
  • Figure 2 shows the dispersion diagram of the charged powder without the use of the arrangement
  • Figure 3 shows the dispersion diagram of the powder when the arrangement is put into effect
  • Figure 4 shows an example of a spraying nozzle with which, the invention can be put into effect
  • Figure 5 shows the use of such a spraying nozzle for surface-coating a deeply profiled girder with powder.
  • powder preferably colouring powder which has been charged in a known way in an electrostatic charging arrangement 1 which comprises a plurality of curved ducts made of electrically non-conducting material, is supplied to a nozzle arrangement 2 according to the present invention which is connected to the charging arrangement 1 and preferably consists of a plurality of delivery pipes 3 which are able to revolve round swivel unions 4.
  • the said pipes can be set up in the desired position and are able to reach both the inside 5A, and the outside 5B of an object 5, such as a girder, box, cupboard, etc., which it is desired to coat with the charged powder.
  • a sleeve-type nozzle component 6 which is preferably screwed onto the pipe 3 so that it can be displaced along the latter over a specific dis- tance.
  • a number of air supply devices 8 are provided on the respective nozzle components 6, spaced at a distance from the powder supply outlet 7 of the said pipe 3 and the central part of the nozzle component 6.
  • the said devices 8 are formed by lance-like tubes which are fixed by one end 8A into a through-flow duct 9 in the nozzle component 6 so that they extend out from the nozzle component 6 substantially in the delivery direction of the powder.
  • the air supply outlets 10 of the said devices 8 are expediently located at a distance from the powder delivery outlets 7 of the respective nozzle components 6.
  • Supply hoses 11 for compressed air preferably air at a high pressure, for example at a pressure between 2 and 4 bar, can be connected by one of their respective ends 11A to a pressure source, for example a compressor, via an air supply line 13 connected via a manifold coupling 12 to a plurality of pipes 11, and by their opposite ends 11B to a close-fitting air throughflow duct 9.
  • two air supply devices 8 are disposed at substantially the same distance from the powder delivery outlet 7 and extend substantially mutually parallel. It is possible to connect the desired number of supply devices 8 in a desired pattern around the circumference of the nozzle component 6, for example by mounting them movably, for example so that they may be rotated relative to the nozzle component 6.
  • Figure 2 shows what the dispersion diagram 14 is like with a nozzle component 6 when spraying charged powder conveyed by air using a conventional nozzle component, i.e. the powder spreads out with a wide dispersion angle.
  • Figure 3 shows how the powder dispersion diagram 15 can be when the present invention is applied, i.e.
  • the powder 16 after being delivered from the powder delivery outlet 7 in the form of a cone, the powder 16 is influenced by compressed air 17 supplied by the air supply devices 8 and flowing out via the air supply outlets 10, to form a supporting stream at a higher pressure than that of the delivered stream of powder, which is entrained with an effect like that of an ejector within a narrower, guiding and supporting stream 18 with higher impulsion, i.e. an increase in the speed of the powder particles is achieved, together with control of the form of the cloud of powder 16.
  • the charge level of the powder 16 is substantially maintained throughout the entire delivery phase from the outlet 2, and the concentrated air-powder stream 18 can effectively deliver the charged powder to the desired location, even when this is a long distance away from the powder delivery outlet 7, for example in deep cupboards, boxes, or on a girder as shown in Figure 5.
  • a suitable material for the arrangement would be a plastic material.
  • an annular air supply slot extending round the powder delivery outlet at the desired distance therefrom, viewed from the side and in the delivery direction of the powder, could form the air supply outlet.
  • other pneumatic gaseous fluids could optionally also be used instead of air; for example, ionised air could be used.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Fertilizing (AREA)

Abstract

Procédé pour distribuer par une buse de pulvérisation des particules de poudre chargées dans un dispositif de charge électrostatique au moyen d'une charge par frottement dans des conduits coudés allongés à base de matériau électriquement non conducteurs, lesdites particules de poudre étant transportées dans un écoulement d'air à travers le dispositif (1) et sortant par une sortie (7) dans un élément de buse (6). La présente invention permet le transport et la distribution efficaces de particules de poudre chargées à des endroits désirés et séparés par une distance considérable de l'unité de distribution, tout en permettant simultanément d'obtenir une uniformité de l'épaisseur de revêtement de poudre. Après distribution par la sortie de distribution de poudre (7), la poudre (16) est soumise à l'action de l'air comprimé (17) ou autre s'écoulant par une pluralité de sorties d'alimentation d'air (10) placées à une certaine distance de ladite sortie (7), et conçues pour présenter une pression supérieure à celle de l'écoulement de sortie de poudre si bien que, avec un effet similaire à celui d'un éjecteur, la poudre est entraînée en un jet de guidage et de support (18) formé par l'air comprimé (17) avec une impulsion supérieure de manière à obtenir un accroissement de la vitesse des particules de poudre, ainsi qu'un contrôle de la forme du nuage de poudre (16) distribué par la sortie de distribution de poudre (7). La présente invention décrit également un dispositif pour réaliser efficacement ce procédé.Method for distributing powder particles charged in an electrostatic charging device by a spray nozzle by means of a friction charge in elongated bent conduits based on electrically non-conductive material, said powder particles being transported in a flow of air through the device (1) and exiting through an outlet (7) in a nozzle element (6). The present invention allows efficient transport and distribution of powder particles loaded at desired locations and separated by a considerable distance from the distribution unit, while simultaneously achieving uniformity in the thickness of the powder coating. After dispensing through the powder dispensing outlet (7), the powder (16) is subjected to the action of compressed air (17) or the like flowing through a plurality of air supply outlets (10 ) placed at a certain distance from said outlet (7), and designed to present a pressure higher than that of the powder outlet flow so that, with an effect similar to that of an ejector, the powder is entrained in a guide and support jet (18) formed by compressed air (17) with a higher pulse so as to obtain an increase in the speed of the powder particles, as well as a control of the shape of the powder cloud ( 16) dispensed through the powder dispensing outlet (7). The present invention also describes a device for efficiently carrying out this process.

Description

A Process for use with a Spraying Nozzle, and an Arrangement for carrying out the Process.
The present invention relates to a process for delivering grains of powder charged in an electrostatic charging arrangement by friction charging in curved elongated ducts made from electrically non-conducting material. The main object of the present invention is firstly to provide a process of the above-mentioned kind which makes it possible to convey and deliver charged grains of powder effectively to a location a considerable distance from the delivery unit in order to reach into deeply disposed corners and other deep-lying parts of cupboards, girders, etc., for example, which it is desired to coat with charged powder, especially colouring powder, where at the same time it is desired that an even coating thickness also be obtained. The said object is achieved by means of the process according to the present invention.
A further object of the invention is to provide an arrangement which may be used to carry out the process according to the invention. The said further object is achieved by means of an arrangement according to the present invention.
The invention is described below by way of a preferred embodiment example, with reference to the accompanying drawings on which Figure 1 shows a delivery arrangement constructed according to the invention, viewed at an angle from the front,
Figure 2 shows the dispersion diagram of the charged powder without the use of the arrangement, Figure 3 shows the dispersion diagram of the powder when the arrangement is put into effect,
Figure 4 shows an example of a spraying nozzle with which, the invention can be put into effect,
Figure 5 shows the use of such a spraying nozzle for surface-coating a deeply profiled girder with powder.
In the example shown powder, preferably colouring powder which has been charged in a known way in an electrostatic charging arrangement 1 which comprises a plurality of curved ducts made of electrically non-conducting material, is supplied to a nozzle arrangement 2 according to the present invention which is connected to the charging arrangement 1 and preferably consists of a plurality of delivery pipes 3 which are able to revolve round swivel unions 4. The said pipes can be set up in the desired position and are able to reach both the inside 5A, and the outside 5B of an object 5, such as a girder, box, cupboard, etc., which it is desired to coat with the charged powder. At the outer ends 3A of the respective pipes 3 there is a preferably sleeve-type nozzle component 6 which is preferably screwed onto the pipe 3 so that it can be displaced along the latter over a specific dis- tance. A number of air supply devices 8 are provided on the respective nozzle components 6, spaced at a distance from the powder supply outlet 7 of the said pipe 3 and the central part of the nozzle component 6. Preferably, the said devices 8 are formed by lance-like tubes which are fixed by one end 8A into a through-flow duct 9 in the nozzle component 6 so that they extend out from the nozzle component 6 substantially in the delivery direction of the powder. The air supply outlets 10 of the said devices 8 are expediently located at a distance from the powder delivery outlets 7 of the respective nozzle components 6. Supply hoses 11 for compressed air, preferably air at a high pressure, for example at a pressure between 2 and 4 bar, can be connected by one of their respective ends 11A to a pressure source, for example a compressor, via an air supply line 13 connected via a manifold coupling 12 to a plurality of pipes 11, and by their opposite ends 11B to a close-fitting air throughflow duct 9.
In the example shown two air supply devices 8 are disposed at substantially the same distance from the powder delivery outlet 7 and extend substantially mutually parallel. It is possible to connect the desired number of supply devices 8 in a desired pattern around the circumference of the nozzle component 6, for example by mounting them movably, for example so that they may be rotated relative to the nozzle component 6.
The functioning of the said arrangement is as follows, with reference initially to Figures 2 and 3. Figure 2 shows what the dispersion diagram 14 is like with a nozzle component 6 when spraying charged powder conveyed by air using a conventional nozzle component, i.e. the powder spreads out with a wide dispersion angle. Figure 3 shows how the powder dispersion diagram 15 can be when the present invention is applied, i.e. after being delivered from the powder delivery outlet 7 in the form of a cone, the powder 16 is influenced by compressed air 17 supplied by the air supply devices 8 and flowing out via the air supply outlets 10, to form a supporting stream at a higher pressure than that of the delivered stream of powder, which is entrained with an effect like that of an ejector within a narrower, guiding and supporting stream 18 with higher impulsion, i.e. an increase in the speed of the powder particles is achieved, together with control of the form of the cloud of powder 16. The charge level of the powder 16 is substantially maintained throughout the entire delivery phase from the outlet 2, and the concentrated air-powder stream 18 can effectively deliver the charged powder to the desired location, even when this is a long distance away from the powder delivery outlet 7, for example in deep cupboards, boxes, or on a girder as shown in Figure 5.
A suitable material for the arrangement would be a plastic material.
The invention is not limited to the example described above and shown on the drawings, but may be modified within the framework of the following Patent Claims without exceeding the scope of the invention. For example, an annular air supply slot extending round the powder delivery outlet at the desired distance therefrom, viewed from the side and in the delivery direction of the powder, could form the air supply outlet. For the air, other pneumatic gaseous fluids could optionally also be used instead of air; for example, ionised air could be used.

Claims

P a t e n t C l a i m s
1. A process for delivering via a spraying nozzle powder grains charged in an electrostatic charging arrangement (1) by friction charging in curved elongated ducts made from electrically non-conducting material, these powder grains being conveyed in a stream of air through the arrangement (1) and out through an outlet (7) in a nozzle component (6), characterised in that, after being delivered through the powder delivery outlet (7) the said charged powder (16) is influenced by compressed air (17) or a similar fluid which is endowed with a pressure exceeding the pressure of the out-flowing stream of powder and which flows out through a plurality of air supply outlets (10) spaced at a distance from the said outlet (7) both in the lateral direction and in the direction of the delivery from the powder delivery outlet (7), so that the powder is entrained in a narrower guiding and supporting jet (18) formed by the said compressed air (17) and effective in the desired spraying direction, the speed of the powder particles thus being increased and the powder (16) delivered through the powder delivery outlet (7) being guided to the desired spraying location.
2. An arrangement for a spraying nozzle for delivering grains of powder charged in an electrostatic charging arrangement (1) by friction charging in curved elongated ducts made of electrically non-conducting material, these powder grains being conveyed in a stream of air through the arrangement (1) and out through an outlet (7) in a nozzle component (6), according to Patent Claim 1, characterised in that a plurality of air supply outlets (10), spaced at a distance from the said outlet (7) in the lateral direction and in the direction of the delivery from the powder delivery outlet (7), are designed to supply compressed air (17) at a higher pressure than that which the stream of powder flowing out through the powder delivery outlet (7) is designed to display.
3. An arrangement according to Patent Claim 2, characterised in that a plurality of lance-like air supply devices (8) extend substantially in the delivery direction of the powder with their respective ends formed as air supply outlets (10).
4. An arrangement according to Patent Claim 3, characterised in that the said devices (8) are distributed around the circumference of the nozzle component (6).
5. An arrangement according to either of Patent Claims 3-4, characterised in that the devices (8) are mounted and fixed by one of their ends (8A) in air through-flow ducts (9) extending through the nozzle component (6), and that hoses (11) leading from a compressed air source are connected to the said ducts (9) on the side away from the powder delivery outlet (7).
6. An arrangement according to any of the preceding Patent Claims 3-5, characterised in that the respective free outlet ends (10) of the said devices (8) extend for a distance beyond the nozzle component (6) such that they are located inside the dispersion diagram (14) of the powder emerging from the outlet (7) before pressurised air is supplied to flow out through the said outlets (10).
7. An arrangement according to Patent Claim 2, characterised in that an annular air supply slot extends round the said powder delivery outlet (7) at the desired distance therefrom, viewed in the lateral direction and in the powder delivery direction.
EP84904195A 1983-10-27 1984-10-29 A process for use with a spraying nozzle, and an arrangement for carrying out the process Withdrawn EP0191766A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8305891 1983-10-27
SE8305891A SE8305891L (en) 1983-10-27 1983-10-27 METHOD OF SPRAY NOZZLE EQUIPMENT FOR IMPLEMENTATION OF THE PROCEDURE

Publications (1)

Publication Number Publication Date
EP0191766A1 true EP0191766A1 (en) 1986-08-27

Family

ID=20353067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84904195A Withdrawn EP0191766A1 (en) 1983-10-27 1984-10-29 A process for use with a spraying nozzle, and an arrangement for carrying out the process

Country Status (7)

Country Link
EP (1) EP0191766A1 (en)
AU (1) AU3616384A (en)
CH (1) CH664508A5 (en)
DK (1) DK287685D0 (en)
NO (1) NO852560L (en)
SE (1) SE8305891L (en)
WO (1) WO1985001894A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629450B1 (en) * 1993-05-07 2000-06-28 Nordson Corporation Powder coating system and powder coating thickness sensor
FI981716A0 (en) * 1998-08-07 1998-08-07 Urho Anttonen Method and apparatus for treating surfaces
DE10319916A1 (en) * 2003-05-05 2004-11-25 Itw Gema Ag Spraying device for coating material, in particular coating powder
DE10321614A1 (en) * 2003-05-14 2004-12-30 P + S Pulverbeschichtungs- Und Staubfilteranlagen Gmbh Coating process as well as powder nozzle and coating booth
CN105880059A (en) * 2014-09-17 2016-08-24 沈阳北光天地塑粉制品有限公司 A double-bore tube type electrostatic spraying gun
CA2966129C (en) * 2014-10-27 2022-08-02 Council Of Scientific & Industrial Research Manually controlled variable coverage high range electrostatic sprayer

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1752922A (en) * 1927-04-21 1930-04-01 Vilbiss Co Spray head
US1990824A (en) * 1934-04-16 1935-02-12 Binks Mfg Co Air nozzle for flat-spraying appliances
US2646313A (en) * 1950-09-13 1953-07-21 Vilbiss Co Spray nozzle
US2646314A (en) * 1950-10-19 1953-07-21 Vilbiss Co Spray nozzle
US3470347A (en) * 1968-01-16 1969-09-30 Union Carbide Corp Method for shielding a gas effluent
US3788555A (en) * 1970-04-27 1974-01-29 Ransburg Electro Coating Corp Apparatus for projecting plural component material upon a suitable base
US3702107A (en) * 1971-01-19 1972-11-07 Nordson Corp An apparatus for striping inside seams of cans
US3907202A (en) * 1973-05-10 1975-09-23 Skm Sa Spray-gun apparatus for atomizing paint or similar liquids
US4308996A (en) * 1980-03-17 1982-01-05 Eutectic Corporation Adjustable head for selectively shaping a flame-spray discharge
EP0063707A1 (en) * 1981-04-29 1982-11-03 Binks Manufacturing Company Plural component spray gun

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8501894A1 *

Also Published As

Publication number Publication date
AU3616384A (en) 1985-05-22
DK287685A (en) 1985-06-25
SE8305891L (en) 1985-04-28
WO1985001894A1 (en) 1985-05-09
NO852560L (en) 1985-06-25
SE8305891D0 (en) 1983-10-27
DK287685D0 (en) 1985-06-25
CH664508A5 (en) 1988-03-15

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