Electricity: electrical systems and devices – Electric charging of objects or materials – Particulate matter
Patent
1976-11-02
1978-02-07
Goldberg, Gerald
Electricity: electrical systems and devices
Electric charging of objects or materials
Particulate matter
239DIG14, B05B 502
Patent
active
040730026
ABSTRACT:
A self adjusting power supply for induction charging electrodes used in electrostatic spray coating apparatus is disclosed. A first resistance of high ohmic value is connected in series between a source of high direct current voltage and the induction charging electrode, while a second resistance is connected between the source of voltage and a ground reference point. The first resistance acts as a voltage divider with the spacial impedance which exists between the charging electrodes and ground in the spray nozzle of the spray coating apparatus, and serves to regulate the charging voltage and to compensate for variations in the conductivity of the material being sprayed. If the value of the spacial impedance should decrease for any reason, the increased current flow therethrough produces an increase in the voltage drop across the first resistance, thereby reducing and thus regulating the potential at the charging electrodes and serving to prevent corona and arcing within the spray gun. The ohmic value of the first resistance, which is in the range of 1-50 gigohms, is sufficiently high to prevent any substantial current flow from the charging electrode, thereby reducing the shock hazard of the spray gun, and also to prevent any significant changes in the current flow due to changes in the conductivity of the spray material. The second resistance serves as a bleeder for the charges on the spray gun and the induction charging electrode when the gun is turned off.
REFERENCES:
patent: 3273015 (1966-09-01), Fischer
patent: 3731145 (1973-05-01), Senay
patent: 3895262 (1975-07-01), Ribnitz
Sickles James E.
Tepper Richard M.
Goldberg Gerald
Keane J. Timothy
PPG Industries Inc.
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