EP0034278B1 - Procédé et appareil pour le revêtement électrostatique d'objets à l'aide d'un fluide - Google Patents
Procédé et appareil pour le revêtement électrostatique d'objets à l'aide d'un fluide Download PDFInfo
- Publication number
- EP0034278B1 EP0034278B1 EP81100609A EP81100609A EP0034278B1 EP 0034278 B1 EP0034278 B1 EP 0034278B1 EP 81100609 A EP81100609 A EP 81100609A EP 81100609 A EP81100609 A EP 81100609A EP 0034278 B1 EP0034278 B1 EP 0034278B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bell
- fluid
- spray
- spray bell
- paint
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims abstract description 6
- 239000012530 fluid Substances 0.000 title claims abstract 16
- 238000009503 electrostatic coating Methods 0.000 title claims description 4
- 239000003973 paint Substances 0.000 claims abstract description 31
- 239000007921 spray Substances 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 abstract description 18
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000000889 atomisation Methods 0.000 description 4
- 239000011324 bead Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
- B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
-
- 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
- B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
- B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
-
- 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
- B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
- B05B5/0415—Driving means; Parts thereof, e.g. turbine, shaft, bearings
Definitions
- the invention relates to a method for the electrostatic coating of objects with liquids, in particular liquid paint, by supplying the liquid to a high-voltage spray bell rotating at a high speed of between 15,000 and 60,000 rpm and throwing the liquid off the spray edge of the spray bell coating object with the help of an annular air jacket.
- a so-called low-speed bell is known from DE-B-22 48 167, in which the paint is atomized by electrostatic forces. As soon as the paint is fed to the atomizer head, it is transported to the edge by centrifugal forces. The surface tension of the liquid causes the paint to form a bead on the outer edge of the spray head. Threads are drawn off electrically from this bead. Due to the shifting of the charge in the electric field, the force acting on the thread increases and the liquid pressure inside the thread also increases. If this pressure is greater than the surface tension, the thread is torn and has a high intrinsic charge due to the charge shift. All paint particles charged with the same polarity repel each other, but are attracted to the grounded workpiece.
- centrifugal forces exclusively cause the paint to be transported to the atomizing edge. Only when the electric field is switched off and further paint supply is applied, is centrifugal forces throwing off paint from the bead growing on the edge of the bell. These drops have a large diameter and are not suitable for many painting jobs.
- usable atomization is achieved only by the high voltage.
- the electrical properties of the lacquer thus prove to be important for its good atomization. The higher the paint resistance, the higher the high voltage must be to facilitate good atomization.
- a high-speed bell is known from DE-C-973 478, which forms the preambles of the independent claims. For every paint system there are speeds at which the centrifugal force becomes the decisive atomizing force, whereby electrostatic repulsion only plays a minor role.
- High-speed bells can atomize both highly conductive and semi-conductive paints. All known constructions of this type, as they are also known, for example, as DE-B-12 40 764, work with an atomizer hub in order to prevent the paint from leaving the atomizer system before being transferred to the spray bell.
- the invention has for its object to provide a method with which liquid, in particular liquid paint, can be sprayed onto an object to be processed, even difficult coating materials, such as metallic lacquers, can be processed and a uniform fine distribution of the liquid is ensured, without fear that there are air pockets and dried paint particles from the atomizer hub are re-introduced into the paint.
- This object of the invention is achieved in that the liquid in the axial center of the circumferential spray bell in the axial direction of the same freely supplied to the bell interior and thereby slows down its conveying speed to almost zero and is exposed to the toroidal vortex formed there and by the toroidal vortex of the inner wall of the rotating bell is fed.
- the invention makes use of the toroidal vortex which forms in a bell-shaped cavity at a high rotational speed of the bell and which has a circular bead rotating around its central axis with a backflow component directed deepest in the bell center and a bell executed on the inner edge of the bell to the outside of the bell and with the bell rotating flow component.
- the paint to be sprayed is fed into the center of the bell in such a way that the paint mouth ends freely in the center of the bell space and is exposed here to the conveying component of the torus vortex directed backwards.
- the momentum of the supplied liquid at the outlet opening of the liquid supply line is only so great that the forces applied by the toroidal vortex can cause a deflection in the direction of the inner surface of the bell.
- the invention is also directed to a Device for electrostatically coating objects with liquids, in particular liquid paint, with a bell rotating about a fixed hollow axis with a central liquid supply and a number of compressed air nozzles surrounding the bell.
- a device of this type is described in DE-C-973 478.
- the outlet opening of the hollow axis opening centrally in the base of the bell opens freely towards the interior of the bell and a diffuser is provided in the region of the end of the hollow axis which reduces the conveying speed of the liquid conveyed in the hollow axis.
- the known additional compressed air nozzles are arranged in the rear area of the spray bell, so that the air balance around the rotating bell is ensured and the sprayed paint mist cone receives a defined axial thrust from the circularly rotating air curtain.
- a hollow axis 1 which supports bearings 10, 10 'for a spray bell 2 with a rotor 5, a stator 11 and a dynamic seal 20 and a fabric bushing 16.
- An electrical lead 8 for the stator 11 is guided in a groove 17 on the hollow axis 1 through the bearing 10 '.
- the hollow axis 1 ends in a diffuser 12, which is closed by a rectifying sieve 14.
- the inlet of the diffuser 12 is designed as a valve seat 3, on which the liquid flow can be shut off using a valve needle 4.
- the bell inner contour carries a radial toothing 15 for the transmission of the Coriolis force.
- Compressed air nozzles 9 of a nozzle ring 6 produce an annular air curtain which imparts an axial thrust to the paint mist sprayed on a spray edge 13 of the spray bell 2.
- the paint to be sprayed is introduced via a line 7.
- a pneumatic drive with a turbine rotor 18 and a nozzle ring 19 is provided instead of the electric drive.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Electrostatic Spraying Apparatus (AREA)
- Paints Or Removers (AREA)
- Pens And Brushes (AREA)
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81100609T ATE9203T1 (de) | 1980-02-15 | 1981-01-28 | Verfahren und vorrichtung zum elektrostatischen ueberziehen von gegenstaenden mit einem fluid. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3005677A DE3005677C2 (de) | 1980-02-15 | 1980-02-15 | Verfahren und Vorrichtung zum elektrostatischen Überziehen von Gegenständen mit Flüssigkeiten |
DE3005677 | 1980-02-15 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83102488A Division EP0089043A3 (fr) | 1981-01-28 | 1981-01-28 | Procédé et appareil pour le revêtement électrostatique des objets par des fluides |
EP83102488.0 Division-Into | 1983-03-14 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0034278A2 EP0034278A2 (fr) | 1981-08-26 |
EP0034278A3 EP0034278A3 (en) | 1981-12-16 |
EP0034278B1 true EP0034278B1 (fr) | 1984-09-05 |
Family
ID=6094700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81100609A Expired EP0034278B1 (fr) | 1980-02-15 | 1981-01-28 | Procédé et appareil pour le revêtement électrostatique d'objets à l'aide d'un fluide |
Country Status (10)
Country | Link |
---|---|
US (1) | US4402991A (fr) |
EP (1) | EP0034278B1 (fr) |
JP (1) | JPS56141870A (fr) |
AT (1) | ATE9203T1 (fr) |
BR (1) | BR8100890A (fr) |
DE (2) | DE3005677C2 (fr) |
DK (1) | DK157903C (fr) |
ES (1) | ES8206222A1 (fr) |
MX (1) | MX149160A (fr) |
ZA (1) | ZA81929B (fr) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK151198B (da) * | 1984-10-26 | 1987-11-09 | Niro Atomizer As | Forstoeverhjul til brug i et forstoevningstoerringsanlaeg |
DE3668561D1 (de) * | 1985-05-31 | 1990-03-08 | Unimation Inc | Dispergiervorrichtung mit umlaufender duese. |
US4659018A (en) * | 1985-05-31 | 1987-04-21 | Westinghouse Electric Corp. | Orbiting nozzle dispersion apparatus |
DE3616684A1 (de) * | 1986-05-16 | 1987-11-19 | Behr Industrieanlagen | Zerstaeuber zum elektrostatischen beschichten von gegenstaenden |
DE3634443A1 (de) * | 1986-10-09 | 1988-04-21 | Lactec Ges Fuer Moderne Lackte | Vorrichtung zum elektrostatischen aufbringen von fliessfaehigen medien |
US5086972A (en) * | 1990-08-01 | 1992-02-11 | Hughes Aircraft Company | Enhanced electrostatic paint deposition method and apparatus |
CA2517447C (fr) * | 1994-07-19 | 2007-05-29 | Alcan International Limited | Processus et appareil de coulage d'une bande de metal, et injecteur connexe |
US6409104B1 (en) | 2000-04-19 | 2002-06-25 | Ford Global Technologies, Inc. | Silicon-doped amorphous carbon coating for paint bell atomizers |
GR1003825B (el) * | 2001-03-29 | 2002-02-26 | Φυγοκεντρικη γεννητρια του αεροζολ | |
US6889921B2 (en) * | 2002-09-30 | 2005-05-10 | Illinois Tool Works Inc. | Bell cup skirt |
US20050023385A1 (en) * | 2003-07-29 | 2005-02-03 | Kui-Chiu Kwok | Powder robot gun |
US7128277B2 (en) | 2003-07-29 | 2006-10-31 | Illinois Tool Works Inc. | Powder bell with secondary charging electrode |
US20050056212A1 (en) * | 2003-09-15 | 2005-03-17 | Schaupp John F. | Split shroud for coating dispensing equipment |
US20050173556A1 (en) * | 2004-02-09 | 2005-08-11 | Kui-Chiu Kwok | Coating dispensing nozzle |
DE102006022057B3 (de) * | 2006-05-11 | 2007-10-31 | Dürr Systems GmbH | Applikationselement für einen Rotationszerstäuber und zugehöriges Betriebsverfahren |
GB0625583D0 (en) * | 2006-12-21 | 2007-01-31 | Itw Ltd | Paint spray apparatus |
US8371517B2 (en) | 2007-06-29 | 2013-02-12 | Illinois Tool Works Inc. | Powder gun deflector |
US8602326B2 (en) * | 2007-07-03 | 2013-12-10 | David M. Seitz | Spray device having a parabolic flow surface |
US20090020626A1 (en) * | 2007-07-16 | 2009-01-22 | Illinois Tool Works Inc. | Shaping air and bell cup combination |
US8096264B2 (en) * | 2007-11-30 | 2012-01-17 | Illinois Tool Works Inc. | Repulsion ring |
US10155233B2 (en) * | 2008-04-09 | 2018-12-18 | Carlisle Fluid Technologies, Inc. | Splash plate retention method and apparatus |
US20090314855A1 (en) * | 2008-06-18 | 2009-12-24 | Illinois Tool Works Inc. | Vector or swirl shaping air |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE973478C (de) * | 1952-04-01 | 1960-03-03 | Metallgesellschaft Ag | Vorrichtung zur Ausbildung fein verteilter Nebel in Form einer Wolke fuer die Abscheidung im elektrostatischen Feld unter Anwendung eines Hilfsgasstromes |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2980338A (en) * | 1954-03-04 | 1961-04-18 | Fischer & Co H G | Electrostatic paint spraying system |
US2728606A (en) * | 1954-05-24 | 1955-12-27 | Ransburg Electro Coating Corp | Liquid feeding apparatus |
US2850322A (en) * | 1956-05-31 | 1958-09-02 | Rheem Mfg Co | Centrifugal spray head |
US2893894A (en) * | 1958-11-03 | 1959-07-07 | Ransburg Electro Coating Corp | Method and apparatus for electrostatically coating |
DE1240764B (de) * | 1963-03-15 | 1967-05-18 | Mueller Ernst Fa | Verfahren zum elektrostatischen UEberziehen von Gegenstaenden mit Farbe und Vorrichtung zur Durchfuehrung des Verfahrens |
US4114564A (en) * | 1963-06-13 | 1978-09-19 | Ransburg Corporation | Electrostatic coating apparatus |
US3418971A (en) * | 1964-11-13 | 1968-12-31 | Gen Motors Corp | Apparatus for electrostatic spray coating |
US3442688A (en) * | 1964-11-13 | 1969-05-06 | Gen Motors Corp | Electrostatic spray coating method and apparatus therefor |
US3393662A (en) * | 1964-12-30 | 1968-07-23 | Ronald J. Blackwell | Apparatus for electrostatic spray coating |
DE1933147A1 (de) * | 1969-06-30 | 1971-01-21 | Mueller Ernst Kg | Farbspritzpistole fuer das elektrostatische Farbspritzen |
GB1599303A (en) * | 1977-09-20 | 1981-09-30 | Nat Res Dev | Electrostatic spraying |
JPS5511064A (en) * | 1978-07-12 | 1980-01-25 | Toyota Motor Corp | Rotary type electrostatic coater for conductive paint |
-
1980
- 1980-02-15 DE DE3005677A patent/DE3005677C2/de not_active Expired
-
1981
- 1981-01-28 DE DE8181100609T patent/DE3165801D1/de not_active Expired
- 1981-01-28 EP EP81100609A patent/EP0034278B1/fr not_active Expired
- 1981-01-28 AT AT81100609T patent/ATE9203T1/de not_active IP Right Cessation
- 1981-02-12 DK DK060381A patent/DK157903C/da not_active IP Right Cessation
- 1981-02-12 ZA ZA00810929A patent/ZA81929B/xx unknown
- 1981-02-13 BR BR8100890A patent/BR8100890A/pt not_active IP Right Cessation
- 1981-02-14 ES ES499449A patent/ES8206222A1/es not_active Expired
- 1981-02-16 JP JP2025381A patent/JPS56141870A/ja active Pending
- 1981-02-16 MX MX185995A patent/MX149160A/es unknown
-
1982
- 1982-08-20 US US06/409,948 patent/US4402991A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE973478C (de) * | 1952-04-01 | 1960-03-03 | Metallgesellschaft Ag | Vorrichtung zur Ausbildung fein verteilter Nebel in Form einer Wolke fuer die Abscheidung im elektrostatischen Feld unter Anwendung eines Hilfsgasstromes |
Also Published As
Publication number | Publication date |
---|---|
MX149160A (es) | 1983-09-07 |
BR8100890A (pt) | 1981-08-25 |
DK60381A (da) | 1981-08-16 |
DE3165801D1 (en) | 1984-10-11 |
ES499449A0 (es) | 1982-08-16 |
EP0034278A2 (fr) | 1981-08-26 |
DK157903B (da) | 1990-03-05 |
US4402991A (en) | 1983-09-06 |
JPS56141870A (en) | 1981-11-05 |
EP0034278A3 (en) | 1981-12-16 |
DK157903C (da) | 1990-08-27 |
ATE9203T1 (de) | 1984-09-15 |
DE3005677A1 (de) | 1981-08-20 |
DE3005677C2 (de) | 1982-06-24 |
ES8206222A1 (es) | 1982-08-16 |
ZA81929B (en) | 1982-03-31 |
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