EP0283747A2 - Pistolet de pulvérisation électrostatique - Google Patents

Pistolet de pulvérisation électrostatique Download PDF

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Publication number
EP0283747A2
EP0283747A2 EP88102711A EP88102711A EP0283747A2 EP 0283747 A2 EP0283747 A2 EP 0283747A2 EP 88102711 A EP88102711 A EP 88102711A EP 88102711 A EP88102711 A EP 88102711A EP 0283747 A2 EP0283747 A2 EP 0283747A2
Authority
EP
European Patent Office
Prior art keywords
outlet opening
spray gun
electrostatic spray
guide body
gun according
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.)
Granted
Application number
EP88102711A
Other languages
German (de)
English (en)
Other versions
EP0283747B1 (fr
EP0283747A3 (en
Inventor
Wolfgang Kuhn
Karsten Jüterbock
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.)
Graco Verfahrenstechnik GmbH
Original Assignee
Kopperschmidt-Muller GmbH and Co KG
Boellhoff Verbindungstechnik GmbH
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 Kopperschmidt-Muller GmbH and Co KG, Boellhoff Verbindungstechnik GmbH filed Critical Kopperschmidt-Muller GmbH and Co KG
Priority to AT88102711T priority Critical patent/ATE67692T1/de
Publication of EP0283747A2 publication Critical patent/EP0283747A2/fr
Publication of EP0283747A3 publication Critical patent/EP0283747A3/de
Application granted granted Critical
Publication of EP0283747B1 publication Critical patent/EP0283747B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
    • 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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying

Definitions

  • the invention relates to an electrostatic spray gun with a spray head made of electrically insulating material, which carries a material outlet opening and at least one high-voltage electrode, with the aid of which the material is charged after it has emerged.
  • the spray head has a flat end face in which a nozzle bore is provided centrally as a material outlet opening and a number of nozzle bores are provided as an atomizing air outlet opening on a circle arranged concentrically therewith.
  • a nozzle bore is provided centrally as a material outlet opening and a number of nozzle bores are provided as an atomizing air outlet opening on a circle arranged concentrically therewith.
  • On opposite sides are two horns, in which there are auxiliary air outlet openings, which direct auxiliary air from both sides to improve the atomization or to form the emerging material.
  • auxiliary air outlet openings In at least one auxiliary air outlet opening or in its immediate vicinity there are one or more high-voltage electrodes which protrude by several millimeters from the surface of the spray head, which is made of an electrically insulating material.
  • auxiliary air or secondary air drawn in from auxiliary air is ionized at these electrodes.
  • the charge is given off to material droplets so that they can follow the course of the electrostatic field lines as they continue to fly.
  • the point of impact of the ionized air on the material is determined by the main function (atomization or shaping).
  • An electrostatic spray gun is also already known (US Pat. No. 3,764,068), in which a total of six high-voltage electrodes are arranged approximately uniformly distributed on a circle which extends around an annular material outlet opening and an annular atomizing air outlet opening which concentrically surrounds this .
  • the electrodes are located near the outer circumference of the slightly profiled end face and protrude considerably beyond this end face. They are hollow so that an auxiliary liquid, possibly in a mixture with air, can be fed through them. Droplets of the auxiliary liquid are ionized and fed to the emerging product. These electrodes are very vulnerable to accidental contact.
  • the invention has for its object to provide an electrostatic spray gun of the type described above, in which a better charging of the spray jet is possible.
  • This object is achieved in that from the end face of the spray head protrudes approximately concentrically to the material outlet opening, tapering forward guide body and that the at least one high-voltage electrode is arranged in the region of the base of the guide body.
  • the tips of the high-voltage electrodes are located in a groove formed by the end face extending from the circumference of the spray head and the guide body.
  • the fillet lies in the area of the flow of the secondary air sucked in by the exiting material. This strikes the exiting material in a section determined by the guide body. Due to the shape and arrangement of the guide body, the impact section can be selected so that the material is optimally charged. For better charging also contributes to the fact that the guide body made of insulating material acts in the first phase as a dielectric insulator between the individual electrodes and the emerging material with a low electrical potential.
  • the electrodes in the fillet are well protected against accidental contact. The radially relatively far inner arrangement of the electrodes also increases the security against sparking when approaching grounded components in comparison to electrodes arranged radially further out.
  • the safety against contact is further improved if the high-voltage electrodes do not protrude or only insignificantly over the end face of the spray head.
  • the protrusion should be at most 6 mm and preferably be less than 1 mm. Even with almost hidden electrode tips, there is sufficient charge due to the large number of electrodes.
  • the junction of the ionized air and the leaked material can be influenced not only by the outer shape of the guide body, but also by the fact that the guide body has a central recess and the material outlet opening is at a distance from the front end of the guide body. This increases the distance between the outlet opening and the impact zone.
  • the guide body is shaped in such a way that a tangent drawn from the electrode tip and touching the guide body intersects the axis of the material outlet opening at a point at which the product begins to break down into droplets. In this area the charge transfer is particularly intensive.
  • an atomizing air outlet opening concentrically surrounding the material outlet opening should lie within the basic diameter of the guide body.
  • the electrodes are then swept by the secondary air drawn in by the atomizing air.
  • horns with auxiliary air outlet openings are provided on opposite sides of the material outlet opening, which direct auxiliary air at the emerging product. Irrespective of the ionization, this results in an atomization aid or beam shaping.
  • At least some of the high-voltage electrodes be arranged offset in the circumferential direction from the horns. Sufficient secondary air is supplied regardless of the auxiliary air so that the material jet is charged as strongly as possible.
  • auxiliary air outlet openings can be directed such that their axes intersect the plane of symmetry between the horns between the material outlet opening and the intersection of the tangents with the axis of the material outlet opening. This measure also contributes to the fact that the concentrated electrostatic field is only effective in the spray where it begins to break down into droplets.
  • a particularly preferred application is the processing of a material with medium to high electrical conductivity, such as water-soluble lacquers or release agents.
  • a material with medium to high electrical conductivity such as water-soluble lacquers or release agents.
  • the electrode arrangement described can be used both for guns with air atomization and for those with hydrostatic atomization ("airless method”). If auxiliary air is used, it can be used for air atomization to shape the spray jet and for hydrostatic atomization aid as an atomization aid in the airless / air process ("airless-plus").
  • the body 1 of a spray gun has a spray head 2, which consists of an insert 2 ⁇ made of electrically insulating material and a union nut 3 connecting it to the body 1.
  • a spray head 2 which consists of an insert 2 ⁇ made of electrically insulating material and a union nut 3 connecting it to the body 1.
  • a nozzle body 4 In the center of the spray head 2 there is a nozzle body 4 with a slot as the material outlet opening 5.
  • a sealing disk 6 and an insert 7 are arranged behind it, which carries a valve seat 8 and encloses a valve rod 9.
  • a sloping shoulder 10 of the body 1 holds the series connection of the nozzle body 4, the sealing disk 6 and the insert 7 in place.
  • the spray head 2 has an end face 11, from which a guide body 12 with a conical surface 13 protrudes in the middle and which extends to the circumference of the spray head 2.
  • the nozzle body 4 is located at the front end of the guide body 12.
  • Each electrode 14 is connected to a distributor ring 16 via a line 15. This is in contact with a high-voltage connection 19 having a protective resistor 18.
  • the material outlet opening 5 emits a spray jet 21.
  • the outlet opening for example up to the distance a, there is still a coherent veil. Behind it breaks up into many small droplets.
  • the material emerging at high speed entrains air so that secondary air flows along the end face 11 and the cone face 13 according to the arrow 22.
  • This air is ionized by the high voltage electrodes 14. It follows the flow drive and the electrostatic field.
  • the guide body 12 has a certain influence on this field.
  • the tangents 23 starting from the electrode tips and touching the guide body 12 meet the axis of the outlet opening at a distance b, that is, where the material begins to break down into droplets. Since the predominant part of the air only hits the spray jet 21 in this area, good droplet charging is ensured. This applies in particular because the ionization takes place from all sides, that is to say concentrically.
  • reference numerals increased by 100 are used for corresponding parts. It is essentially different that the guide body 112 has a surface 113 with a smaller cone angle and that there is a central recess 124 in the interior of the guide body, that is to say the nozzle body 104 is set back a bit to the rear. Both lead to the fact that the ionized air only hits the spray jet 121 at a greater distance from the outlet opening, as is again illustrated by the tangents 123 starting from the electrode tips and touching the guide body 112; here the point of intersection with the axis of the outlet opening 105 is at a distance c from this outlet opening.
  • FIG. 3 shows how the electrodes 114 are arranged uniformly around the outlet opening 105.
  • the effectiveness of the electrodes is not only directed radially, but also goes aside in the context of the electrostatic field. Therefore, secondary air that flows in through area I is influenced by an electrode 114, while two electrodes are effective in the areas II in between. This results in a fairly uniform ionization of the supplied secondary air all around.
  • a material outlet opening 205 which can be shut off by a valve rod 209, is supplied with material almost without pressure via a channel 220.
  • An atomizing air nozzle 225 is provided concentrically to this and is supplied with atomizing air via an annular space 226 and a channel 227.
  • two horns 228 and 229 are provided which have auxiliary air outlet openings 230.
  • a guide body 212 is connected upstream of the end face 211 of the spray head 202.
  • the high-voltage electrodes 214 are located at the transition point.
  • the electrodes 214 can, as shown in FIG. 4, be located partially below the horns, so that auxiliary air is forcibly supplied to them. In most cases, however, it is more favorable for the uniform ionization if the electrodes 214 are arranged offset circumferentially to the horns.
  • the auxiliary air outlet openings 230 should be directed so that the auxiliary air impinges on the spray jet before the tangents described reach the outlet axis. This improves atomization and ionization.
  • the horns 228 and 229 can also be used with the hydrostatic atomizing nozzles of FIGS. 1 and 2.
  • the auxiliary air directed by them onto the material not only supports the atomization process so that a lower hydrostatic pressure can be used, but it is also ionized and thereby improves the charging.
  • the guide body can also have a different external shape, for example curved.
  • the electrodes do not have to be placed exactly on the base of the guide body, but can be arranged in a certain area in front of or behind it, without losing the advantages described.
  • the spray gun can also be operated in an atmosphere from a gas equivalent to the air.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
EP88102711A 1987-02-24 1988-02-24 Pistolet de pulvérisation électrostatique Expired - Lifetime EP0283747B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88102711T ATE67692T1 (de) 1987-02-24 1988-02-24 Elektrostatische spruehpistole.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873705815 DE3705815A1 (de) 1987-02-24 1987-02-24 Elektrostatische spruehpistole
DE3705815 1987-02-24

Publications (3)

Publication Number Publication Date
EP0283747A2 true EP0283747A2 (fr) 1988-09-28
EP0283747A3 EP0283747A3 (en) 1990-01-10
EP0283747B1 EP0283747B1 (fr) 1991-09-25

Family

ID=6321610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88102711A Expired - Lifetime EP0283747B1 (fr) 1987-02-24 1988-02-24 Pistolet de pulvérisation électrostatique

Country Status (5)

Country Link
US (1) US4842203A (fr)
EP (1) EP0283747B1 (fr)
AT (1) ATE67692T1 (fr)
DE (2) DE3705815A1 (fr)
ES (1) ES2026216T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2644903C2 (ru) * 2012-10-01 2018-02-14 Грако Миннесота Инк. Распылительный наконечник в сборе для электростатического распылительного пистолета

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8802130D0 (en) * 1988-02-01 1988-03-02 Devilbiss Co Spraygun
DE3834983A1 (de) * 1988-10-14 1990-04-19 Kopperschmidt Mueller & Co Spritzpistole
US5165605A (en) * 1989-03-30 1992-11-24 Iwata Air Compressor Mfg. Co., Ltd. Low pressure air atomizing spray gun
US5064123A (en) * 1990-05-10 1991-11-12 S. C. Johnson & Son, Inc. Insecticide dispensing apparatus
US5409162A (en) * 1993-08-09 1995-04-25 Sickles; James E. Induction spray charging apparatus
US5372309A (en) * 1993-11-15 1994-12-13 Ehle; Larry L. Airless nozzle using ambient air for improved atomization
US5873523A (en) * 1996-02-29 1999-02-23 Yale University Electrospray employing corona-assisted cone-jet mode
FR2776946B1 (fr) * 1998-04-01 2000-05-26 Sames Sa Bol de pulverisation et projecteur rotatif electrostatique equipe d'un tel bol
US6669112B2 (en) * 2001-04-11 2003-12-30 Illinois Tool Works, Inc. Air assisted spray system with an improved air cap
US6758418B2 (en) * 2001-08-07 2004-07-06 Nordson Corporation Swirl gun
EP1507595A1 (fr) * 2002-05-28 2005-02-23 Kelsan Technologies Inc. Ensemble buse de pulverisation
US6874708B2 (en) * 2003-02-13 2005-04-05 Illinois Tool Works Inc. Automatic air-assisted manifold mounted gun
DE10315483A1 (de) * 2003-04-04 2004-11-04 Deutsche Amphibolin-Werke Von Robert Murjahn Stiftung & Co. Kg Farbe auf Basis mindestens einer Polymerdispersion und Verfahren zum Auftrag der Farbe
US7784718B2 (en) 2004-12-28 2010-08-31 Ransburg Industrial Finishing K.K. Electrostatic paint sprayer
TWI432264B (zh) * 2007-04-10 2014-04-01 Graco Minnesota Inc 可反轉的空氣輔助無空氣噴霧尖端
WO2009076150A2 (fr) * 2007-12-05 2009-06-18 Wagner Spray Tech Corporation Pistolet à godet et à embout de pulvérisation à double ouverture
EP3628398B1 (fr) 2015-01-28 2021-08-04 Fona Technologies, Inc. Procédé pour la préparation d'un produit encapsulé et produit encapsulé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764068A (en) * 1971-08-02 1973-10-09 Air Ind Method of protecting electrostatic spray nozzles from fouling
US3767116A (en) * 1972-03-23 1973-10-23 Elektro Ion Nozzle for electrostatic powder spraying apparatus
CH579951A5 (fr) * 1975-04-11 1976-09-30 Gema Ag
DE2446022B2 (de) * 1974-09-26 1980-06-04 Esb Elektrostatische Spritz- Und Beflockungsgesellschaft G.F. Voehringer Gmbh, 7758 Meersburg Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit flüssigem oder pulverförmigem Beschichtungsmaterial

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659787A (en) * 1969-04-16 1972-05-02 Ransburg Electro Coating Corp Nozzle
US3583632A (en) * 1969-05-23 1971-06-08 Binks Mfg Co Electrostatic spray coating apparatus
US3907202A (en) * 1973-05-10 1975-09-23 Skm Sa Spray-gun apparatus for atomizing paint or similar liquids
GB1509740A (en) * 1974-11-14 1978-05-04 Skm Sa Spray gun for atomizing paint or other similar products
FR2354142A1 (fr) * 1976-06-09 1978-01-06 Skm Sa Tete de pulverisation pour appareil de pulverisation electrostatique de peinture ou d'un liquide analogue
DE2713328A1 (de) * 1977-03-25 1978-10-05 Gema Ag Vorrichtung zum elektrostatischen auftragen von beschichtungsmaterial auf gegenstaende
GB1600631A (en) * 1978-01-10 1981-10-21 Binks Bullows Ltd Spray nozzle
GB2020200B (en) * 1978-03-08 1982-09-15 Air Ind Electrostatic spraying
US4258885A (en) * 1979-03-23 1981-03-31 Legeza Thomas B Nozzle tip and method of manufacture
US4497447A (en) * 1983-05-23 1985-02-05 Graco, Inc. Energy damping device for spray gun
DE3505618A1 (de) * 1985-02-19 1986-08-21 Kopperschmidt-Mueller Gmbh & Co Kg, 4800 Bielefeld Verfahren zum beschichten von gegenstaenden mit hilfe eines spruehstrahls und vorrichtung zur durchfuehrung dieses verfahrens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764068A (en) * 1971-08-02 1973-10-09 Air Ind Method of protecting electrostatic spray nozzles from fouling
US3767116A (en) * 1972-03-23 1973-10-23 Elektro Ion Nozzle for electrostatic powder spraying apparatus
DE2446022B2 (de) * 1974-09-26 1980-06-04 Esb Elektrostatische Spritz- Und Beflockungsgesellschaft G.F. Voehringer Gmbh, 7758 Meersburg Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit flüssigem oder pulverförmigem Beschichtungsmaterial
CH579951A5 (fr) * 1975-04-11 1976-09-30 Gema Ag

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2644903C2 (ru) * 2012-10-01 2018-02-14 Грако Миннесота Инк. Распылительный наконечник в сборе для электростатического распылительного пистолета

Also Published As

Publication number Publication date
EP0283747B1 (fr) 1991-09-25
EP0283747A3 (en) 1990-01-10
DE3705815C2 (fr) 1990-03-29
ATE67692T1 (de) 1991-10-15
ES2026216T3 (es) 1992-04-16
DE3865053D1 (en) 1991-10-31
US4842203A (en) 1989-06-27
DE3705815A1 (de) 1988-09-01

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