EP0245849B1 - Pulvérisateur pour le revêtement électrostatique d'objets - Google Patents
Pulvérisateur pour le revêtement électrostatique d'objets Download PDFInfo
- Publication number
- EP0245849B1 EP0245849B1 EP87106943A EP87106943A EP0245849B1 EP 0245849 B1 EP0245849 B1 EP 0245849B1 EP 87106943 A EP87106943 A EP 87106943A EP 87106943 A EP87106943 A EP 87106943A EP 0245849 B1 EP0245849 B1 EP 0245849B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sprayer
- spray head
- shield
- coated
- article
- 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 - Lifetime
Links
- 238000009503 electrostatic coating Methods 0.000 title description 2
- 239000007921 spray Substances 0.000 claims description 38
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 8
- 238000011109 contamination Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 3
- 239000012459 cleaning agent Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
- B05B5/04—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
- B05B5/001—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means incorporating means for heating or cooling, e.g. the material to be sprayed
Definitions
- the invention relates to an atomizer according to the preamble of claim 1.
- Known rotary atomizers e.g. serve for electrostatic coating of vehicle bodies, are contaminated in operation by the sprayed coating material.
- the bell-plate jacket, the area of the drive shaft between the spray bell and the front housing part containing the shaft bearing, and the outer surfaces of this housing part itself are particularly at risk.
- the undesired precipitation is not only lost for the object to be coated, but can in part be released during operation and only later hike to the object, which then eg becomes significantly dirty when changing colors.
- the known atomizers therefore have to be cleaned frequently and regularly in a relatively laborious and time-consuming manner, which means long periods of non-operation and a corresponding impairment, especially of the large-scale coating.
- the invention has for its object to provide an atomizer, the outer areas containing the drive and / or the storage of the spray head tend less to fogging by coating material than before and, if necessary, can be cleaned more easily.
- the rotating cover which can expediently be an extension of the bell plate or the like via the front housing end, could in itself be cleaned much more easily than fixed housing surfaces, for example by spraying a solvent onto the cover. Surprisingly, it has been shown that there is almost no self-contamination of the rotating parts (cover and spray head). This may be due to the air currents generated by the rotation.
- a rotary atomizer is known per se, the rotating spray head of which has an axially projecting cylindrical projection at its end facing away from the object to be coated, which closely encloses and also rotates around a cylindrical projection of the housing part containing the bearing (EP-A 0120648).
- the purpose of this construction is to seal an ink chamber formed between the housing and the spray head to the outside.
- the sprayed-off paint particles are charged by a bell electrode located inside the spray head and an additional electrode arranged outside with a small radial distance, which is surrounded by a further outer electrode serving to repel the paint particles.
- the cylindrical housing attachment surrounded by the spray head attachment does not lie in an area in which there is a particular risk of contamination from the sprayed coating material.
- This exemplary embodiment is an atomizer device which is particularly suitable for coating vehicle bodies with so-called water-based paints and has a rotary atomizer whose spray head 2, which is provided with a bell cup 3, can be mounted on a hollow shaft construction 4 containing a paint supply line, which is known in the front part 5 the housing of the atomizer is mounted.
- the spray head 2 is grounded during operation, so it is at the same potential as the body to be coated.
- a plurality of outer electrodes 6 are used, which are inserted at their rear end into an annular body 7 of insulating material surrounding the atomizer housing at a distance, in which an electrical conductor 8, which connects the electrodes to one another and is connected to a high-voltage line, against them the face of the ring body facing the body is arranged isolated.
- the arrangement and the mutual spacing of the electrodes are selected so that no significant deposit of coating material occurs on the end face of the ring body 7 during operation.
- the electrodes can be expediently arranged in pins 9 made of insulating material and projecting axially from the end face of the ring body 7.
- outer electrodes distributed radially around the spray head could also be used be provided, which are each arranged on their own radially projecting holders from the housing, as is known from DE-A 34 29 075.
- the invention is also suitable for spray devices in which the spray head itself is placed at high voltage potential.
- a rotating cover 10 is provided for the front part 5 of the atomizer housing, the outer surfaces of which, including the end face, lie in an area where there is a risk of contamination from the coating material sprayed from the bell cup 3.
- the generally cup-shaped cover 10 can consist of metal, sits coaxially on the shaft construction 4 with a central opening of its bottom part 11 and is connected to it by e.g. two axial drive pins 12 connected in a rotationally secured manner.
- the pins 12 of the cover 10 can easily be inserted into axial bores in a corresponding end face of the shaft construction 4 without tools.
- the cover 10 is then fastened in a nut-like manner by means of a thread on the bell plate 3 screwed onto the shaft construction 4.
- the cover could also be integrally formed on the bell plate. Due to the described construction of the cover 10 and the bell plate 3 as two separate components, these may be Much easier to assemble on the drive shaft than a one-piece component (because you can hold the shaft with the cover when screwing on the bell cup).
- the generally sleeve-shaped part 14 of the cover 10 concentrically surrounds the cylindrical with a certain play Outer surface of the housing part 5 and extends to a radially projecting housing part 20, the end face facing the spray head contains an annular slot 21 into which the annular rear edge of the sleeve-shaped cover part 14 engages all around.
- This arrangement which forms a type of labyrinth seal, prevents the penetration of coating material into the space between the cover 10 and the housing part 5, especially if compressed air is conducted into the slot 21.
- the bell plate 3 of the spray head 2 has, as shown, a sleeve-shaped outer wall 15, the outer surface of which is to be flush with the outer surface of the cover 10. Even better than with a cylindrical cover with a radially constant outer diameter, the deposition of coating material on the cover is avoided if its outer diameter is steadily smaller towards the rear, which is probably due to the corresponding changing peripheral speeds. The conical widening of the outer diameter continues forward on the outer wall 15 of the bell cup 3 up to the vicinity of the spraying edge 16.
- outlet openings 22 of the housing part 20 open. Air can escape through these openings, which on the one hand can serve as guiding air for supporting and shaping the spray jets in the direction of the object to be coated. On the other hand, the air emerging at this point can also contribute to the support and stabilization of the pollution-preventing air flows on and around the rotating cover 10, or may even be required.
- At least one outlet opening for a liquid or gaseous cleaning agent for the cover opens at the rear end of the cover 10.
- This can be the aforementioned air outlet openings 22 or separate openings 23.
- a separate cleaning device (not shown) which can be moved along its outer surface can be arranged for cleaning the cover 10.
- the cover 10 could also be rotatably supported and driven separately from the spray bell.
- One possibility for driving the cover enclosing the housing part 5 would be, for example, air nozzles arranged at its rear end.
- the housing part enclosed by the rotating cover 10 is the part containing the bearings of the spray head 2.
- the axial length of the cover i.e. the length of the covered part of the housing is at least as large as half (maximum) outer diameter of the spray head 2.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Claims (16)
- Pulvérisateur pour le recouvrement électrostatique d'objets, comportant une tête de pulvérisation (2) qui est montée en rotation sur ou dans une partie de boîtier (5) dont la surface extérieure se situe dans une région risquant d'être souillée par le matériau de recouvrement pulvérisé, notamment une tête de pulvérisation (2) qui, pendant le fonctionnement, se situe à un potentiel aussi faible que l'objet à recouvrir et comportant des électrodes (6), disposées radialement à l'extérieur de la tête de pulvérisation (2), en vue de charger les particules pulvérisées, caractérisé en ce qu'il est prévu un couvercle (10) tournant pour la partie de boîtier (5) située dans la zone de souillure.
- Pulvérisateur selon la revendication 1, caractérisé en ce que le couvercle tournant (10) entoure la partie de boîtier (5) contenant les paliers de la tête de pulvérisation (2).
- Pulvérisateur selon la revendication 1, caractérisé en ce que le couvercle (10) est solidaire de la tête de pulvérisation (2).
- Pulvérisateur selon la revendication 1 ou 2, caractérisé en ce que le couvercle (10) est un élément de construction séparé du plateau en cloche (3) de la tête de pulvérisation (2).
- Pulvérisateur selon la revendication 4, caractérisé en ce que le couvercle (10) est bloqué en rotation par des doigts d'entraînement (12) ou d'une autre manière, sur la construction d'arbre d'entraînement (4) de la tête de pulvérisation et est fixé par le plateau en cloche (3) vissé dessus.
- Pulvérisateur selon l'une des revendications précédentes, caractérisé en ce que le diamètre extérieur du couvercle (10) diminue constamment dans la direction éloignée de l'objet à recouvrir.
- Pulvérisateur selon l'une des revendications précédentes, caractérisé en ce que les surfaces extérieures du couvercle (10) et de la tête de pulvérisation (2) s'étendent constamment conjointement.
- Pulvérisateur selon la revendication 7, caractérisé en ce que le plateau en cloche (3) de la tête de pulvérisation (2) possède une paroi extérieure (15) en forme de manchon, dont la surface extérieure présente un diamètre augmentant coniquement en direction de l'objet à recouvrir et se raccorde, sans fente, à la surface extérieure du couvercle (10).
- Pulvérisateur selon la revendication 1, caractérisé en ce que le couvercle tourne par rapport à la tête de pulvérisation.
- Pulvérisateur selon l'une des revendications précédentes, caractérisé en ce qu'un orifice de sortie d'air (22) au moins débouche à l'extrémité du couvercle (10), éloignée de l'objet à recouvrir.
- Pulvérisateur selon l'une des revendications précédentes, caractérisé en ce qu'un orifice de sortie (23) au moins, destiné à un produit de nettoyage liquide ou gazeux, débouche à l'extrémité du couvercle (10), éloignée de l'objet à recouvrir.
- Pulvérisateur selon l'une des revendications précédentes, caractérisé en ce que le couvercle (10) tourne dans un évidement (21) annulaire du boîtier, avec l'extrémité annulaire, éloignée de l'objet à recouvrir, de sa partie (14) en forme de manchon, entourant la partie de boîtier (5).
- Pulvérisateur selon la revendication 12, caractérisé en ce que de l'air comprimé est envoyé dans l'évidement (21) annulaire.
- Pulvérisateur selon l'une des revendications précédentes, caractérisé en ce que les paliers du couvercle (10) tournant ou de la tête de pulvérisation sont refroidis par de l'air comprimé.
- Pulvérisateur selon l'une des revendications précédentes, caractérisé en ce que la longueur axiale du couvercle (10) est au moins aussi grande que la moitié du diamètre de la tête de pulvérisation (2).
- pulvérisateur selon l'une des revendications précédentes, caractérisé en ce que la longueur axiale du dispositif constitué du couvercle (10) et de la tête de pulvérisation (2) est au moins aussi grande que le diamètre de la tête de pulvérisation (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3616684 | 1986-05-16 | ||
DE19863616684 DE3616684A1 (de) | 1986-05-16 | 1986-05-16 | Zerstaeuber zum elektrostatischen beschichten von gegenstaenden |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0245849A2 EP0245849A2 (fr) | 1987-11-19 |
EP0245849A3 EP0245849A3 (en) | 1988-10-26 |
EP0245849B1 true EP0245849B1 (fr) | 1991-03-06 |
Family
ID=6301054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87106943A Expired - Lifetime EP0245849B1 (fr) | 1986-05-16 | 1987-05-13 | Pulvérisateur pour le revêtement électrostatique d'objets |
Country Status (4)
Country | Link |
---|---|
US (1) | US4760965A (fr) |
EP (1) | EP0245849B1 (fr) |
DE (2) | DE3616684A1 (fr) |
ES (1) | ES2020665B3 (fr) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3609240C2 (de) * | 1986-03-19 | 1996-08-01 | Behr Industrieanlagen | Vorrichtung zum elektrostatischen Beschichten von Gegenständen |
EP0283918B1 (fr) * | 1987-03-23 | 1991-07-10 | Behr Industrieanlagen GmbH & Co. | Dispositif de revêtement électrostatique d'objets |
DE8708312U1 (de) * | 1987-06-12 | 1987-07-30 | Behr Industrieanlagen GmbH & Co, 74379 Ingersheim | Einrichtung zum Vernebeln flüssiger Farbe |
US4927081A (en) * | 1988-09-23 | 1990-05-22 | Graco Inc. | Rotary atomizer |
GB2250698B (en) * | 1988-09-23 | 1992-12-23 | Graco Inc | Rotary atomizer |
DE4105116C2 (de) * | 1991-02-19 | 2003-03-27 | Behr Industrieanlagen | Vorrichtung und Verfahren zum elektrostatischen Beschichten von Gegenständen |
JP2830683B2 (ja) * | 1992-09-11 | 1998-12-02 | トヨタ自動車株式会社 | 回転霧化静電塗装装置 |
US5226605A (en) * | 1992-09-30 | 1993-07-13 | Barr & Murphy (Canada) Ltee/Ltd. | Rotary atomizer disk with replaceable nozzle inserts and method for replacing inserts |
DE4342336A1 (de) * | 1993-12-11 | 1995-06-14 | Abb Patent Gmbh | Rotationszerstäuber |
DE19611369A1 (de) * | 1996-03-22 | 1997-09-25 | Duerr Gmbh & Co | Rotationszerstäuber zum elektrostatisch unterstützten Beschichten von Gegenständen mit Farben bzw. Lacken |
DE19637308A1 (de) * | 1996-09-13 | 1998-03-19 | Abb Patent Gmbh | Rotationssprühzerstäuber |
US5865379A (en) * | 1997-05-12 | 1999-02-02 | Agco Corporation | Isolator for depending components on electrostatic field sprayer boom |
DE102005015604B4 (de) * | 2005-04-05 | 2007-04-12 | Dürr Systems GmbH | Rotationszerstäuberbauteil |
US7455249B2 (en) | 2006-03-28 | 2008-11-25 | Illinois Tool Works Inc. | Combined direct and indirect charging system for electrostatically-aided coating system |
US20080011333A1 (en) * | 2006-07-13 | 2008-01-17 | Rodgers Michael C | Cleaning coating dispensers |
US7520450B2 (en) * | 2006-10-10 | 2009-04-21 | Illinois Tool Works Inc. | Electrical connections for coating material dispensing equipment |
DE102006057596A1 (de) | 2006-12-06 | 2008-06-19 | Dürr Systems GmbH | Lenkluftring mit einer Ringmulde und entsprechender Glockenteller |
GB0625583D0 (en) * | 2006-12-21 | 2007-01-31 | Itw Ltd | Paint spray apparatus |
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 |
DE102008027997A1 (de) * | 2008-06-12 | 2009-12-24 | Dürr Systems GmbH | Universalzerstäuber |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2047699A (en) * | 1934-02-05 | 1936-07-14 | Harold L Periman | Spraying apparatus for liquid and semiliquid material |
US2967669A (en) * | 1958-03-05 | 1961-01-10 | Edward O Norris | Centrifugal spraying device |
NL270215A (fr) * | 1960-11-02 | |||
FR2336183A1 (fr) * | 1975-12-26 | 1977-07-22 | Marchand Bernard | Couronne de compensation d'air et de repulsion pour appareil d'application de peinture liquide par procede electrostatique du type a disque tournant a grande vitesse |
FR2412351A1 (fr) * | 1977-12-20 | 1979-07-20 | Air Ind | Projecteur electrostatique de peinture a bol ou a disque tournant avec un joint d'etancheite pneumatique |
DE3005677C2 (de) * | 1980-02-15 | 1982-06-24 | Basf Farben + Fasern Ag, 2000 Hamburg | Verfahren und Vorrichtung zum elektrostatischen Überziehen von Gegenständen mit Flüssigkeiten |
US4376135A (en) * | 1981-03-20 | 1983-03-08 | Binks Manufacturing Company | Apparatus for atomization in electrostatic coating and method |
DE3214314A1 (de) * | 1982-04-19 | 1983-10-20 | J. Wagner AG, 9450 Altstätten | Elektrostatische spruehvorrichtung |
US4529672A (en) * | 1983-03-29 | 1985-07-16 | Union Carbide Corporation | Process of making electrochemical electrodes and electrodes made thereby |
JPS60168917A (ja) * | 1984-02-10 | 1985-09-02 | Nissan Motor Co Ltd | 気体軸受装置 |
DE3429075A1 (de) * | 1984-08-07 | 1986-02-20 | Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim | Vorrichtung zum elektrostatischen beschichten von gegenstaenden |
GB8428288D0 (en) * | 1984-11-08 | 1984-12-19 | Pye B J | Electrostatic sprayers |
-
1986
- 1986-05-16 DE DE19863616684 patent/DE3616684A1/de not_active Withdrawn
-
1987
- 1987-02-09 US US07/012,426 patent/US4760965A/en not_active Expired - Lifetime
- 1987-05-13 ES ES87106943T patent/ES2020665B3/es not_active Expired - Lifetime
- 1987-05-13 EP EP87106943A patent/EP0245849B1/fr not_active Expired - Lifetime
- 1987-05-13 DE DE8787106943T patent/DE3768327D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE3616684A1 (de) | 1987-11-19 |
US4760965A (en) | 1988-08-02 |
EP0245849A3 (en) | 1988-10-26 |
EP0245849A2 (fr) | 1987-11-19 |
ES2020665B3 (es) | 1991-09-01 |
DE3768327D1 (de) | 1991-04-11 |
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