EP0839579A1 - Abmessungen für die Luft- und Flüssigkeitsöffnungen der Düse einer Niederdruckspritzpistole - Google Patents

Abmessungen für die Luft- und Flüssigkeitsöffnungen der Düse einer Niederdruckspritzpistole Download PDF

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Publication number
EP0839579A1
EP0839579A1 EP97118345A EP97118345A EP0839579A1 EP 0839579 A1 EP0839579 A1 EP 0839579A1 EP 97118345 A EP97118345 A EP 97118345A EP 97118345 A EP97118345 A EP 97118345A EP 0839579 A1 EP0839579 A1 EP 0839579A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
duct
air
ring
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Withdrawn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
EP97118345A
Other languages
English (en)
French (fr)
Inventor
Giampietro Taglier
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.)
Officine Meccaniche Ani SpA
Original Assignee
Officine Meccaniche Ani SpA
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 Officine Meccaniche Ani SpA filed Critical Officine Meccaniche Ani SpA
Publication of EP0839579A1 publication Critical patent/EP0839579A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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
    • 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
    • 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
    • B05B7/0892—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 outlet orifices for jets constituted by a liquid or a mixture containing a liquid being disposed on a circle

Definitions

  • the present invention relates to a painting device with low overspray.
  • the method of applying coatings by using spray guns is currently the most widely used one in many professional fields in order to achieve high-quality coating combined with low investments in equipment and low running costs.
  • spray guns have a structural configuration which includes a shaped hollow body provided with a duct for feeding a coating product, which ends with a spray nozzle, and with a duct for feeding pressurized gas (air) which ends with an atomizing cap which forms a chamber together with the body.
  • the chamber leads into a hole which is coaxial to the nozzle and forms a ring of gas that surrounds it.
  • Diametrically opposite wings are also formed in the cap and have respective internal passages for pressurized gas which are connected to said chamber and lead into the region located downstream of said nozzle, crossing their flows with those of said nozzle and of the ring of gas that surrounds it.
  • Manually or automatically-operated valves for cutting off the supply passages are associated with the hollow body.
  • Transfer efficiency is also linked, as mentioned, to the brand and type of spray gun, since it essentially depends on the shape of the jet, on the pressure in the cap and on the atomization.
  • H.V.L.P. high volume low pressure
  • spray guns which operate with a "high” volume of air and a low pressure (limited to 10 psi, i.e., 0.7 bar), measured dynamically inside the atomization cap.
  • the aim of the present invention is to provide a device for painting with liquid coatings which has a high transfer efficiency combined with high atomization power and very easy and inexpensive use.
  • an important object of the present invention is to provide higher transfer efficiency than conventional spray guns without compromising performance in terms of quality.
  • An important object of the present invention is to provide, conditions being equal, a transfer efficiency which is at least equal to that of H.V.L.P. spray guns, achieving finer atomization of coatings and thus improving the quality of the final work.
  • Another object of the present invention is to provide a device which does not require the aid of secondary equipment which is not already available in painting sites and thus does not compromise the investment and management costs for the user.
  • Another object of the present invention is to provide a device which entails no changes to the working habits of users.
  • a painting device comprising a shaped hollow body provided with a duct for feeding a coating product which ends with a spray nozzle having an aperture of at least one square millimeter and a duct for feeding pressurized gas which ends in an atomization cap which forms, together with said body, a chamber which leads into a hole which is coaxial to said nozzle and forms a ring of gas around it, manually- or automatically-actuated valves being associated with said hollow body to cut off said ducts; characterized in that the passage section of said ring of gas that surrounds said nozzle is smaller than, or equal to, one square millimeter.
  • a spray gun for applying coatings is generally designated by the reference numeral 10 and conventionally assumes the shape of a hollow body 11.
  • a container or duct 12 for the coating is fixed to the body 11 and is connected to a supply duct 13 which ends with a spray nozzle 14 whose passage section is at least one square millimeter.
  • the duct 15 ends inside an atomization cap 17, which is joined to the body 11 by means of a threaded ring 18 and forms a chamber 19 which leads into a hole 20 which is coaxial to the nozzle 14 and forms a ring of air around it.
  • Two diametrically opposite wings 21 are also formed in the cap 17 and have two internal passages 22 which are connected to the duct 15 and lead into the region downstream of the nozzle 14 so as to cross their streams with the stream arriving from said nozzle and from the ring that surrounds it.
  • Cutoff valves 24,25 are also associated with the hollow body 11 in a conventional manner; in this case, the valves are actuated manually by means of a lever 23; the valve 24 is meant to adjust the passage for supplying the coating product and consists of a needle-shaped obturator which is coaxial to the nozzle 14 and is suitable to open and close it, while a valve 25 is meant to adjust the air supply.
  • the passage section of the pressurized air ring that surrounds the nozzle 14 and is determined by the hole 20 is smaller than, or equal to, one square millimeter.
  • the coating product may optionally be fed without pressure to the apparatus and atomization may be caused exclusively by the mixing between the air and the product, which is aspirated spontaneously by means of a Venturi effect.
  • the reduced passage section causes the need for very precise coupling, in view of the fact that it is essential for the hole 20 of the atomization cap 17 to be as concentric as possible to the nozzle 14 in order to obtain an air ring which has the same force on all sides, so that the coating product is propelled axially with respect to the nozzle 14 and the cap 17.
  • the spray nozzle 14 has been given an external polygonal shape and a hole 20 has been provided whose diameter is such that the corners, designated by the reference numeral 26, of the nozzle 14 are in contact with its walls.
  • the resulting effect is a radial ring of holes shaped like circular segments which have the same passage section.
  • the number of faces of the polygon can vary as a function of the outside diameter of the nozzle 14 in order to obtain the chosen passage section.
  • the number of faces must be at least four.
  • annular passage can be provided around the nozzle 14.
  • the materials employed may be any according to requirements.
EP97118345A 1996-11-05 1997-10-22 Abmessungen für die Luft- und Flüssigkeitsöffnungen der Düse einer Niederdruckspritzpistole Withdrawn EP0839579A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD960267 1996-11-05
IT96PD000267A IT1287979B1 (it) 1996-11-05 1996-11-05 Dispositivo di verniciatura a bassa fumosita'

Publications (1)

Publication Number Publication Date
EP0839579A1 true EP0839579A1 (de) 1998-05-06

Family

ID=11391562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97118345A Withdrawn EP0839579A1 (de) 1996-11-05 1997-10-22 Abmessungen für die Luft- und Flüssigkeitsöffnungen der Düse einer Niederdruckspritzpistole

Country Status (2)

Country Link
EP (1) EP0839579A1 (de)
IT (1) IT1287979B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030091487A (ko) * 2002-05-28 2003-12-03 솔라텍 주식회사 도장용 스프레이 건
EP1731225A1 (de) * 2005-06-06 2006-12-13 H. Ikeuchi & Co., Ltd. Ultrafeine Sprühdüse mit sich überschneidenden Sprühstrahlen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1522013A (en) * 1974-08-12 1978-08-23 Bing & Grondahl Porcelainfab Process for the glazing of porcelain articles and also a spraying head for carrying the process into effect
US4171096A (en) * 1977-05-26 1979-10-16 John Welsh Spray gun nozzle attachment
US4381081A (en) * 1978-12-20 1983-04-26 Nordson Corporation Nozzle assembly for spray coating systems
US4844347A (en) * 1987-03-24 1989-07-04 J. Wagner Gmbh Device for atomizing a liquid
EP0650766A2 (de) * 1993-10-28 1995-05-03 Ransburg Corporation Durch Ansaugen gespeiste Düse für Niederdruckspritzpistolen
JPH07124503A (ja) * 1993-11-01 1995-05-16 Mitsubishi Chem Corp 二流体ノズル及びこれを用いる噴霧乾燥方法
EP0654305A1 (de) * 1993-11-22 1995-05-24 Itw Limited Eine verbesserte Sprühdüse

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1522013A (en) * 1974-08-12 1978-08-23 Bing & Grondahl Porcelainfab Process for the glazing of porcelain articles and also a spraying head for carrying the process into effect
US4171096A (en) * 1977-05-26 1979-10-16 John Welsh Spray gun nozzle attachment
US4381081A (en) * 1978-12-20 1983-04-26 Nordson Corporation Nozzle assembly for spray coating systems
US4844347A (en) * 1987-03-24 1989-07-04 J. Wagner Gmbh Device for atomizing a liquid
EP0650766A2 (de) * 1993-10-28 1995-05-03 Ransburg Corporation Durch Ansaugen gespeiste Düse für Niederdruckspritzpistolen
JPH07124503A (ja) * 1993-11-01 1995-05-16 Mitsubishi Chem Corp 二流体ノズル及びこれを用いる噴霧乾燥方法
EP0654305A1 (de) * 1993-11-22 1995-05-24 Itw Limited Eine verbesserte Sprühdüse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 095, no. 008 29 September 1995 (1995-09-29) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030091487A (ko) * 2002-05-28 2003-12-03 솔라텍 주식회사 도장용 스프레이 건
EP1731225A1 (de) * 2005-06-06 2006-12-13 H. Ikeuchi & Co., Ltd. Ultrafeine Sprühdüse mit sich überschneidenden Sprühstrahlen

Also Published As

Publication number Publication date
ITPD960267A1 (it) 1998-05-05
ITPD960267A0 (it) 1996-11-05
IT1287979B1 (it) 1998-09-10

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