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US 5,121,884 AGranted
Electrostatic spraying devices
AssigneeImperial Chemical Industries PLC
InventorTimothy J. Noakes
Life of this patent
Estimating the term…
Abstract
An electrostatic spraying device is designed in such a way that potential surface leakage paths (FIG. 1b) along which current may leak from the HT generator (2b) are sufficiently long to allow the use of a generator having a smaller than conventional maximum current output.
Claims22
An electrostatic spring device comprising:
- a nozzle,
- means operatively coupled to said nozzle for supplying liquid to the nozzle,
- high voltage supply means having a high voltage output supplying a high voltage circuit, one pole of said high voltage output being operatively connected to at least one of said nozzle and said means for supplying liquid to thereby apply high voltage to liquid supplied to and through the nozzle so that liquid sprayed from the nozzle is electrostatically charged, said device being configured so that leakage between poles of the high voltage output of the high voltage supply is less than 0.3 micro amps.
An electrostatic spraying apparatus comprising:
- a nozzle,
- means operatively coupled to said nozzle for supplying liquid to the nozzle,
- high voltage supply means having a high voltage output supplying a high voltage circuit, one pole of the high voltage output being operatively connected to at least one of said nozzle and said means for supplying liquid to thereby apply high voltage to liquid supplied to and through the nozzle so that at least one ligament of liquid is sprayed from the nozzle, each ligament breaking up into electrostatically charged droplets, the high voltage supply means having a maximum output current when the device is spraying of 1.5 micro amps at 15 kV when a single ligament is sprayed from the nozzle, and a maximum output current when the device is spraying of 0.8 micro amps per 15 kV+0.15 micro amps per ligament when more than one ligament is sprayed from the nozzle.
An electrostatic spraying device comprising:
- a nozzle,
- means operatively coupled to said nozzle for supplying liquid to the nozzle,
- high voltage supply means having a high voltage output supplying a high voltage circuit, one pole of the high voltage output being operatively connected to at least one of said nozzle and said means for supplying liquid to thereby apply high voltage to liquid supplied to and through the nozzle so that liquid sprayed from the nozzle is electrostatically charged, said device being configured so that the greatest average potential gradient across surfaces of the device between conductors or semiconductors connected to opposite poles of the high voltage output is less than 3 kV per cm.
A device for spraying liquids, comprising:
- a housing adapted to be hand held,
- a container for a liquid to be sprayed mounted within the housing,
- a nozzle from which the liquid is to be sprayed,
- means for feeding the liquid from the container to the nozzle, and
- high voltage means for applying electrostatic potential to the liquid so that the liquid issues from the nozzle in the form of an electrically charged atomized spray, the housing being adapted to reduce leakage of current from the high voltage means, the container being collapsible and means being provided for compressing the container in order to effect feed of liquid to the nozzle.
2 more elements
Dependencies are inferred from the claim text.