Electricity: electrical systems and devices – Discharging or preventing accumulation of electric charge
Patent
1981-10-07
1983-11-22
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Discharging or preventing accumulation of electric charge
361228, 361235, H05F 100
Patent
active
044172931
ABSTRACT:
In a supersonic nozzle, a current of compressed air charged with humidity is expanded to produce an aerosol of ice micro-particles. A corona discharge is maintained at the neck of the nozzle at the tip of a tapered electrode by a high alternating current voltage supply connected between the electrode and the nozzle body. The alternately positive and negative ions produced by the discharge are trapped by the ice micro-particles and ejected by an orifice at the front of the nozzle out of the enclosure in the direction of a space zone the concentration in charges of different signs of which it is desired to raise. The electric supply comprises a capacitor in the circuit between the electrode and a conductive guard ring which is embedded in the body of the nozzle behind the insulating surface thereof. Thus fluxes of positive and negative particles which are overall balanced are obtained at the exit of the nozzle. The apparatus is well adapted to the elimination of static charges of electrified bodies.
REFERENCES:
patent: 3083318 (1963-03-01), Hanscom
patent: 3271483 (1966-09-01), Phillipson et al.
patent: 3600632 (1971-08-01), Bright et al.
patent: 3795839 (1974-03-01), Walberg
patent: 3821603 (1974-06-01), De La Cierva
patent: 3863108 (1975-01-01), Blythe et al.
patent: 4228479 (1980-10-01), Larigaldie et al.
"A New Device for the Neutralization of Static Electricity on Pulverulent Materials"-Larigaldie et al., Journal of Electrostatics, May 1981.
Moose Jr. Harry E.
Office National d'Etudes et de Recherches Aerospatiales
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