EP1177050B1 - Pulverisateur a vitesse de rotation elevee comportant un anneau a air de guidage - Google Patents

Pulverisateur a vitesse de rotation elevee comportant un anneau a air de guidage Download PDF

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Publication number
EP1177050B1
EP1177050B1 EP99910346A EP99910346A EP1177050B1 EP 1177050 B1 EP1177050 B1 EP 1177050B1 EP 99910346 A EP99910346 A EP 99910346A EP 99910346 A EP99910346 A EP 99910346A EP 1177050 B1 EP1177050 B1 EP 1177050B1
Authority
EP
European Patent Office
Prior art keywords
bell
air ring
ring
rotary atomizer
directing air
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
Application number
EP99910346A
Other languages
German (de)
English (en)
Other versions
EP1177050A1 (fr
Inventor
Gunter BÖRNER
Steffen Georgi
Josef Wittmann
Hidetoshi Yamabe
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.)
ABB Patent GmbH
Original Assignee
ABB Patent 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 ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP1177050A1 publication Critical patent/EP1177050A1/fr
Application granted granted Critical
Publication of EP1177050B1 publication Critical patent/EP1177050B1/fr
Anticipated expiration legal-status Critical
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    • 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
    • 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
    • B05B5/0426—Means for supplying shaping gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter

Definitions

  • the invention relates to a rotary atomizer with external charging, the Applying conductive lacquers, in particular water-based lacquer, to one to be coated Surface of a body can be used.
  • Rotary atomizers are for example in DE 31 30 096 C2, DE 31 51 929 C2 and EP 0 829 306 A2.
  • the water-based paint is fed centrally to a bell that moves at high speed rotates (10000 rpm to 70000 rpm). Due to the centrifugal force Paint led to the edge of the bell and thrown from there in the form of small drops.
  • the droplets move parallel to the surface of the at the first flight moment object to be coated, which is located in the front of the atomizer.
  • a Airflow from the atomizer towards the object to be coated becomes the Droplets are then directed towards the object to be coated.
  • the air will behind the bell from the atomizer directed out of holes or slots.
  • the droplets become electrostatic charged. This is done by needle electrodes, which are attached radially around the bell are and are at negative DC potential.
  • the tension is in Range between - 40 kV and - 100 kV.
  • the high field strengths that occur the needle tips (> 25 kV / cm) lead to ionization of the air in front of the needle tips.
  • the resulting electrons attach themselves to air molecules and form negative ones Ions that are in the electric field to the bell at earth potential and move to the grounded object to be coated.
  • the higher the field strength and charge the higher the force and thus the efficiency of the order are.
  • There is an upper limit for the applied voltage From a given Voltage levels beat the uniform corona discharges into so-called Streamers around. On the one hand, this leads to a very uneven charging of the droplets and, on the other hand, the breakdown between the needle electrodes and initiate the grounded bell.
  • the invention has for its object a high-ration atomizer with external discharge and steering air ring, with which an increased efficiency with reduced Tendency to discharge is reached.
  • the steering air ring is not directly earthed for this purpose but connected to the earth potential via an ohmic resistor.
  • Fig. 1 shows a section of an atomizer with a turbine 3, which is made of a conductive material (metal and carbon). This is immediately grounded.
  • the turbine is usually equipped with an air bearing. Rolling bearings are also possible.
  • the shaft 4 of the turbine 3 is a hollow shaft in which the conductive ink supply line 5 and the solvent supply line and color return line, not shown here, are located.
  • the bell 6 is attached, which is usually made of metal.
  • the paint supplied in the paint tube 5 exits through the openings 7 and 8 and runs on the face of the bell 6 to the edge of the bell from which the paint is sprayed.
  • the turbine 4 is surrounded by a housing 1 made of non-conductive material (usually plastic).
  • the air 20, 21 is guided to the front of the atomizer by appropriate components made of insulating material 2, 9, 11 .
  • the steering air ring 13 made of conductive material has openings 12 for the steering air 21.
  • the steering air ring 13 is electrically connected to the turbine 3 via one or more parallel resistors 17 (resistance components). Good contacting can be achieved, for example, by springs 16 .
  • the conductive steering air ring 13 is provided with an insulating part 11 toward the bell, which primarily covers the edge of the steering air ring 13 .
  • Auxiliary air 20 is also passed through openings 10 in this insulating ring 11 , which avoids air turbulence at the edge of the bell.
  • the bell 6 is additionally covered on the outside with an insulating part 22 in order to further increase the security against flashovers.
  • connection between the steering air ring 13 and the grounded turbine 2 can also take place via components 23 which are made of a material which accordingly has the same electrical resistance as the resistors 17 listed above. This is shown in Fig. 3 as an embodiment.
  • the steering air ring 13 is manufactured itself from high-resistance material and to connect it to earth.
  • the resistance between the edge of the steering air ring that the needle electrodes is facing, and the earth potential is in the range of 10 M ⁇ to 500 M ⁇ .
  • the aim should be that at the edge of the steering air ring 13 , which faces the electrode holder 18 with the needle electrodes 19 , no high field strengths occur, which lead to streamer discharges.
  • a high-resistance connection can be introduced between the conductive steering air ring 13 and the plastic cover 15 , which reduces the potential.
  • 4 shows a simple exemplary embodiment. Between the steering air ring 13 and the plastic cover 15 , a ring 14 made of high-resistance material (for example plastic with added graphite or soot) is placed. This must finally touch the plastic cover 15 around the entire circumference.
  • the total flow of the atomizer is the sum of the three partial currents to the earthed object I o , to the earthed bell I g and to the steering air ring I l .
  • I I O + I l + I G.

Claims (10)

  1. Pulvérisateur à vitesse de rotation élevée pour l'application de peinture conductrice du courant électrique, en particulier de peinture à base d'eau, le pulvérisateur rotatif comprenant :
    a) un système d'électrodes (18, 19) pour l'application d'une charge extérieure électrostatique
    b) un bol de pulvérisation (6) conducteur du courant électrique et connecté à la terre, qui peut être mis en rotation par des dispositifs d'entraínement (3, 4) logés dans un carter de pulvérisateur (1) en un matériau électriquement isolant, caractérisé par
    c) un anneau d'air de guidage (13) en un matériau conducteur du courant électrique par lequel de l'air de guidage (21) peut être soufflé et qui est à potentiel de tension élevé (par exemple -10 kV)
    d) des moyens (13, 16, 17) étant prévus, qui forment une résistance ohmique dans la plage de 10 MΩ à 500 MΩ et établissent par l'intermédiaire de cette résistance une connexion électrique de l'anneau d'air de guidage (13) au potentiel de terre.
  2. Pulvérisateur à vitesse de rotation élevée selon la revendication 1, caractérisé en ce qu'un ou plusieurs composants formant résistances (17) parallèles sont prévus comme moyens de connexion de l'anneau d'air de guidage (13) au potentiel de terre.
  3. Pulvérisateur à vitesse de rotation élevée selon la revendication 2, caractérisé en ce qu'il est prévu au moins un élément élastique (16) pour assurer la connexion électrique avec les composants formant résistances (17).
  4. Pulvérisateur à vitesse de rotation élevée selon la revendication 1, caractérisé en ce que l'anneau d'air de guidage (13) est réalisé en un matériau à forte valeur ohmique, de telle sorte que l'anneau d'air de guidage (13) lui-même peut être utilisé comme moyen pour la connexion au potentiel de terre, une résistance ohmique dans la plage de 10 MΩ à 500 MΩ étant établie entre une l'arête de l'anneau d'air de guidage tournée vers l'une des électrodes (19) et un composant au potentiel de terre.
  5. Pulvérisateur à vitesse de rotation élevée selon une des revendications précédentes, caractérisé en ce que l'anneau d'air de guidage (13), dans une zone tournée vers le bol (6) est couvert par un élément isolant (11), électriquement isolant, une distance minimale de 4 mm à 15 mm étant ainsi réglée entre l'anneau d'air de guidage (13) non protégé et le bol (6).
  6. Pulvérisateur à vitesse de rotation élevée selon une des revendications précédentes, caractérisé en ce que le bol (6) sur sa face extérieure tournée vers l'anneau d'air de guidage (13), est couvert par un élément isolant (22) électriquement isolant.
  7. Pulvérisateur à vitesse de rotation élevée selon une des revendications précédentes, caractérisé en ce qu'une partie de l'anneau d'air de guidage (13) tournée vers les électrodes (19) est couverte par un anneau (15) en un matériau isolant et qu'un anneau (14) en matériau à forte valeur ohmique est inséré entre l'anneau (15) en matériau isolant aux fins de réduire l'intensité du champ, les entrefers entre les composants (13, 14, 15) étant évités par une conformation adaptée.
  8. Pulvérisateur à vitesse de rotation élevée selon une des revendications précédentes, caractérisé en ce que l'anneau d'air de guidage (13), dans une zone partielle de sa surface, est couvert par un élément isolant (11) qui couvre en particulier un bord de l'anneau d'air de guidage (13) tourné vers le bol (6), afin de réduire les risques de court-circuit électrique entre l'anneau (13) et le bol 6).
  9. Pulvérisateur à vitesse de rotation élevée selon la revendication 8, caractérisé en ce qu'à travers des ouvertures (10) dans l'élément isolant (11), de l'air additionnel (20) peut être soufflé dans l'espace intermédiaire, entre l'élément isolant (11) et le bol (6), les turbulences d'air au niveau du bord du bol étant ainsi évitées.
  10. Pulvérisateur à vitesse de rotation élevée selon une des revendications 7 à 9, caractérisé en ce que le bord antérieur de l'anneau (15) en matériau isolant est couvert d'un revêtement (24) en matériau à forte valeur ohmique, en particulier de peinture, aux fins de diminuer l'intensité de champ dans la région du bord antérieur.
EP99910346A 1999-03-16 1999-03-16 Pulverisateur a vitesse de rotation elevee comportant un anneau a air de guidage Expired - Lifetime EP1177050B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1999/001705 WO2000054888A1 (fr) 1999-03-16 1999-03-16 Pulverisateur a vitesse de rotation elevee comportant un anneau a air de guidage

Publications (2)

Publication Number Publication Date
EP1177050A1 EP1177050A1 (fr) 2002-02-06
EP1177050B1 true EP1177050B1 (fr) 2003-01-22

Family

ID=8167242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99910346A Expired - Lifetime EP1177050B1 (fr) 1999-03-16 1999-03-16 Pulverisateur a vitesse de rotation elevee comportant un anneau a air de guidage

Country Status (9)

Country Link
US (1) US6565021B2 (fr)
EP (1) EP1177050B1 (fr)
JP (1) JP4343445B2 (fr)
KR (1) KR100492233B1 (fr)
AU (1) AU2933299A (fr)
CA (1) CA2367140C (fr)
DE (1) DE59904125D1 (fr)
ES (1) ES2189399T3 (fr)
WO (1) WO2000054888A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011006617B4 (de) 2011-04-01 2018-08-16 Bayerische Motoren Werke Aktiengesellschaft Rotationszerstäuber mit Außenelektroden zum Beschichten eines Werkstücks

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DE10202711A1 (de) * 2002-01-24 2003-07-31 Duerr Systems Gmbh Zerstäuber für die elektrostatische Serienbeschichtung von Werkstücken
JP2004167411A (ja) * 2002-11-21 2004-06-17 Anest Iwata Corp 静電塗装用高電圧発生器
US6929823B2 (en) * 2003-05-01 2005-08-16 E. I. Du Pont De Nemours And Company Process for the high-speed rotary application of liquid, pigmented coating agents
JP2007000826A (ja) * 2005-06-27 2007-01-11 Duerr Japan Kk ベル型塗装装置
US20090020626A1 (en) 2007-07-16 2009-01-22 Illinois Tool Works Inc. Shaping air and bell cup combination
US20090314855A1 (en) * 2008-06-18 2009-12-24 Illinois Tool Works Inc. Vector or swirl shaping air
DE102009013979A1 (de) 2009-03-19 2010-09-23 Dürr Systems GmbH Elektrodenanordnung für einen elektrostatischen Zerstäuber
US9022361B2 (en) 2012-01-05 2015-05-05 Ledebuhr Industries, Inc. Rotary atomizer drip control method and apparatus
DE102015000709A1 (de) * 2015-01-21 2016-07-21 Dürr Systems GmbH Glockenteller oder Lenkluftring mit nicht-metallischem Material zur Funkenvermeidung
WO2019035473A1 (fr) * 2017-08-18 2019-02-21 Abb株式会社 Machine à enduire par pulvérisation
CN110049821B (zh) * 2017-08-18 2020-09-04 Abb瑞士股份有限公司 静电涂装机

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GB1209653A (en) * 1968-07-02 1970-10-21 Air O Static Inc Apparatus for electrostatic spray coating
JPS58190457U (ja) * 1982-06-10 1983-12-17 富士写真フイルム株式会社 静電塗装装置
US4771949A (en) * 1984-10-29 1988-09-20 Hermann Behr & Sohn Gmbh & Co. Apparatus for electrostatic coating of objects
US4887770A (en) * 1986-04-18 1989-12-19 Nordson Corporation Electrostatic rotary atomizing liquid spray coating apparatus
DE3863562D1 (de) * 1987-03-23 1991-08-14 Behr Industrieanlagen Vorrichtung zum elektrostatischen beschichten von werkstuecken.
US5085373A (en) * 1987-03-23 1992-02-04 Behr Industrieanlagen Gmbh & Co. Apparatus for coating workpieces electrostatically
FR2692501B1 (fr) * 1992-06-22 1995-08-04 Sames Sa Dispositif de projection electrostatique de produit de revetement liquide a tete de pulverisation rotative.
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
JPH06320065A (ja) * 1993-05-07 1994-11-22 Toyota Motor Corp ベル型静電塗装装置
JP3254828B2 (ja) * 1993-07-12 2002-02-12 トヨタ自動車株式会社 回転霧化静電塗装方法およびその装置
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011006617B4 (de) 2011-04-01 2018-08-16 Bayerische Motoren Werke Aktiengesellschaft Rotationszerstäuber mit Außenelektroden zum Beschichten eines Werkstücks

Also Published As

Publication number Publication date
KR20020003189A (ko) 2002-01-10
KR100492233B1 (ko) 2005-05-31
WO2000054888A1 (fr) 2000-09-21
JP2002538957A (ja) 2002-11-19
CA2367140C (fr) 2007-06-12
EP1177050A1 (fr) 2002-02-06
JP4343445B2 (ja) 2009-10-14
AU2933299A (en) 2000-10-04
US6565021B2 (en) 2003-05-20
US20020066809A1 (en) 2002-06-06
CA2367140A1 (fr) 2000-09-21
DE59904125D1 (de) 2003-02-27
ES2189399T3 (es) 2003-07-01

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