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1. (EP0502114) ELECTROSTATIC SPRAY GUN

Office : European Patent Office
Application Number: 91901050 Application Date: 20.11.1990
Publication Number: 0502114 Publication Date: 09.09.1992
Publication Kind : B1
Prior PCT appl.: Application Number:US1990006663 ; Publication Number: Click to see the data
IPC:
B 05B
B05B 5/025
B05B 5/043
B05B 5/053
B PERFORMING OPERATIONS; TRANSPORTING
05
SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
B
SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
5
Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
025
Discharge apparatus, e.g. electrostatic spray guns
043
using induction-charging
B PERFORMING OPERATIONS; TRANSPORTING
05
SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
B
SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
5
Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
025
Discharge apparatus, e.g. electrostatic spray guns
B PERFORMING OPERATIONS; TRANSPORTING
05
SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
B
SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
5
Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
025
Discharge apparatus, e.g. electrostatic spray guns
043
using induction-charging
B PERFORMING OPERATIONS; TRANSPORTING
05
SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
B
SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
5
Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
025
Discharge apparatus, e.g. electrostatic spray guns
053
Arrangements for supplying power, e.g. charging power
CPC:
B05B 5/0535
B05B 5/043
B05B 5/0533
Applicants: SICKLES JAMES E
Inventors: SICKLES JAMES E
Priority Data: 07439842 21.11.1989 US
9006663 20.11.1990 US
Title: (DE) ELEKTROSTATISCHE SPRÜHPISTOLE
(EN) ELECTROSTATIC SPRAY GUN
(FR) PISTOLET VAPORISATEUR ELECTROSTATIQUE
Abstract: front page image
(EN) An adapter for converting spray guns to electrostatic or induction charging includes a housing (60) mountable on a spray gun (10). A high voltage power source (70) is contained in the housing (60) and is connected to an electrode assembly (120) mounted on the front of the housing (60). The electrode assembly (120) includes four electrodes (154, 156, 154', 156') which extend in front of the spray gun nozzle (27) and air cap (42) and are spaced symmetrically around the spray axis (158). The nozzle (27) is electrically grounded, while the electrodes (154, 156, 154', 156') carry a voltage in the range of 3-15kV, to produce in the spray path from the nozzle (27) an electrostatic field which produces electrical charges on the sprayed particles. When conductive liquids are sprayed, the particles are charged by induction at relatively low electrostatic field gradients, while nonconductive liquids require high electrostatic field gradients which produce corona effects. These corona effects are enhanced by the provision of a corona needle (190) mounted on the nozzle (27) at the spray axis (158).
(FR) Un adaptateur qui permet de convertir des pistolets vaporisateurs de sorte qu'ils puissent être chargés électrostatiquement ou par induction comprend un logement (60) montable sur un pistolet vaporisateur (10). Une source (70) d'énergie de haute tension contenue dans le logement (60) est connectée à un ensemble d'électrodes (120) monté sur la partie antérieure du logement (60). L'ensemble d'électrodes (120) comprend quatre électrodes (154, 156, 154', 156') qui s'étendent devant l'ajutage (27) du pistolet vaporisateur et du capuchon d'air (42) et sont symétriquement espacées autour de l'axe de vaporisation (158). L'ajutage (27) est mis à la terre, alors que les électrodes (154, 156, 154', 156') portent une tension dans une plage comprise entre 3 et 15kV, afin de produire dans le trajet de vaporisation depuis l'ajutage (27) un champ électrostatique qui produit des charges électriques sur les particules vaporisées. Lorsque l'on vaporise des liquides conducteurs, les particules se chargent par induction à des gradients de champ électrostatique relativement réduits, alors que des liquides non conducteurs requièrent des gradients élevés de champ électrostatique, qui produisent des effets de couronne. Ces effets de couronne sont amplifiés par une aiguille à couronne (190) montée sur l'ajutage (27) au niveau de l'axe de vaporisation (158).
Also published as:
AU1991069537WO/1991/007232