Electrostatic isolation apparatus and method

Details Electrostatic isolation apparatus and method Electrostatic isolation apparatus and method

B - Operations, Transporting

05

B

32/16, 117/54

B05B 5/04 (2006.01) B05B 5/16 (2006.01)

Patent

CA 1230737

ELECTROSTATIC ISOLATION APPARATUS AND METHOD Abstract of the Disclosure An isolator for electrically isolating an electro- statically charged, electrically conductive coating material supply line from a grounded source of conductive coating material while continuously transferring coating material from the source to the supply line. The isolator includes a recep- tacle for a charged coating material reservoir and an insula- tive housing surrounding the charged coating material recep- tacle. The coating material in the receptacle is fed through an outlet to the supply line for an electrostatic coating device, which is electrostatically charged. Due to the conduc- tive nature of the coating material, the electrostatic poten- tial at the coating device is coupled through the coating material, and the reservoir of coating material in the recep- tacle is likewise electrostatically charged. The coating material from the grounded coating material source is coupled to a grounded nozzle assembly in a housing which is positioned above the charged coating material receptacle. The grounded coating material nozzle assembly includes a nozzle in a bottom portion thereof, and the coating material in the grounded nozzle assembly is mechanically vibrated to produce a pulsed jet droplet flow of electrostatic coating material from the nozzle into the charged coating material receptacle. A grounded metallic shield is mounted in the housing between the two coating material receptacles to substantially electrically shield the grounded nozzle assembly from electrical potentials below the shield, including the electrical potential of the charged coating material reservoir. The shield is apertured to permit the passage of the pulsed jet droplet flow of coating material.

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