Fluid sprinkling – spraying – and diffusing – Electrostatic type – Fixed member deflects exiting material
Patent
1991-03-05
1992-10-13
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Electrostatic type
Fixed member deflects exiting material
239690, B05B 5025
Patent
active
051543583
ABSTRACT:
An electrostatic repulsion device is provided in an electrostatic spray paint booth having a grounded ceiling and conveyor to improve transfer efficiency in applying the paint to a workpiece and maintain a safe working environment without requiring protective fencing between an operator and the application equipment. The device includes an electrical cable having a resistive conductor surrounded by an insulation layer. The conductor provides a low electrical capacitance when connected to a high voltage source. Conductive pins are mounted along the cable through the insulation to contact the conductor and are arranged parallel to the spray path in two longitudinal groups, with the first set being diametrically opposed to the second set. Each pin has a discharge end that is substantially flush with the outside surface of the insulation layer. The device is transversely mounted with respect to a spray path of charged, atomized paint particles dispensed from a non-conductive, rotary spray device, so that an electrostatic field from the first set of conductive pins repels the atomized, charged paint particles away from the grounded ceiling and conveyor of the paint booth towards a workpiece. The electrostatic field produced by the second set of conductive pins bleeds accumulated charge from the repulsion device before a high energy discharge can occur whenever a grounded object comes into proximity with the device. This safety feature eliminates the need for protective fencing and interlocks within the spray booth.
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Kashnikow Andres
Merritt Karen B.
Nordson Corporation
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