Method and apparatus for electrostatic spray
First Claim
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1. A method of spraying an aerosol spray, comprising:
- providing a nozzle and an electrode separated by a predetermined distance;
placing said electrode at a high electrical potential relative to said nozzle, either of positive or negative polarity, thereby creating an electric field between said nozzle and said electrode;
ejecting a liquid or powder from said nozzle towards said electrode to atomize the ejected liquid or powder into aerosol droplets or particles so that in the applied electric field between said nozzle and said electrode, said electrode being at a predetermined distance from said aerosol droplets or particles, said aerosol droplets or particles obtaining an induced electric charge, which is of the same polarity as the high voltage electrode, and after the aerosol droplets or particles pass the vicinity of said electrode, forming a directed spray of aerosol droplets or particles having a desired shape and with sufficient momentum and electric charge so that said directed spray of aerosol droplets or particles is deposited on a target.
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Abstract
A method and apparatus to improve the atomization of liquid and the efficiency of depositing liquid particles onto target objects, or to coat the target object with a thin film of liquid, to reduce the risk of high-voltage electrical shock, and to reduce the weight of an electrostatic spray system has been developed by inducing electrostatic charges onto the atomized liquid particles sprayed from a grounded metal nozzle.
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Citations
13 Claims
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1. A method of spraying an aerosol spray, comprising:
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providing a nozzle and an electrode separated by a predetermined distance;
placing said electrode at a high electrical potential relative to said nozzle, either of positive or negative polarity, thereby creating an electric field between said nozzle and said electrode;
ejecting a liquid or powder from said nozzle towards said electrode to atomize the ejected liquid or powder into aerosol droplets or particles so that in the applied electric field between said nozzle and said electrode, said electrode being at a predetermined distance from said aerosol droplets or particles, said aerosol droplets or particles obtaining an induced electric charge, which is of the same polarity as the high voltage electrode, and after the aerosol droplets or particles pass the vicinity of said electrode, forming a directed spray of aerosol droplets or particles having a desired shape and with sufficient momentum and electric charge so that said directed spray of aerosol droplets or particles is deposited on a target.
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2. A method of spraying an aerosol spray, comprising:
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providing a nozzle and an electrode separated by a predetermined distance;
placing said electrode at a high electrical potential relative to said nozzle, either of positive or negative polarity, thereby creating an electric field between said nozzle and said electrode;
ejecting a liquid or powder from said nozzle towards said electrode to atomize the ejected liquid or powder into aerosol droplets or particles so that in the applied electric field between said nozzle and said electrode, said electrode being at a predetermined distance from said aerosol droplets or particles, said aerosol droplets or particles obtain an induced electric charge, which is of the opposite polarity as the high voltage electrode, and after the aerosol droplets or particles pass the vicinity of said electrode, forming a directed spray of aerosol droplets or particles having a desired shape and with sufficient momentum and electric charge so that said directed spray of aerosol droplets or particles is deposited on a target.
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3. A method of spraying an aerosol spray, comprising:
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providing a grounded nozzle and an electrode separated by a predetermined distance;
providing a grounded conductive cover around said nozzle and said electrode, said cover having an opening that allows a directed spray to exit;
placing said electrode at a high electrical potential relative to said nozzle, thereby creating an electric field between said nozzle and said electrode;
ejecting a liquid or powder from said nozzle towards said electrode to atomize the ejected liquid or powder into aerosol droplets or particles so that in the applied electric field between said nozzle and said electrode, said aerosol droplets or particles obtain an induced electric charge, which is of the same polarity as the high voltage electrode, and after the aerosol droplets or particles pass the vicinity of said electrode, forming a directed spray of aerosol droplets or particles having a desired shape and with sufficient momentum and electric charge so that said directed spray of aerosol droplets or particles is deposited on a target. - View Dependent Claims (5)
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4. A method of spraying an aerosol spray, comprising:
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providing a grounded nozzle and an electrode separated by a predetermined distance;
providing a grounded conductive cover around said nozzle and said electrode, said cover having an opening that allows a directed spray to exit;
placing said electrode at a high electrical potential relative to said nozzle, thereby creating an electric field between said nozzle and said electrode;
ejecting a liquid or powder from said nozzle towards said electrode to atomize the ejected liquid or powder into aerosol droplets or particles so that in the applied electric field between said nozzle and said electrode, said aerosol droplets or particles obtain an induced electric charge, which is of the opposite polarity as the high voltage electrode, and after the aerosol droplets or particles pass the vicinity of said electrode, forming a directed spray of aerosol droplets or particles having a desired shape and with sufficient momentum and electric charge so that said directed spray of aerosol droplets or particles is deposited on a target. - View Dependent Claims (6)
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7. An apparatus to spray aerosol particles, comprising:
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a spray gun having at least one electrically conductive and grounded nozzle;
a pressure source to force powder or fluid through said nozzle wherein the exiting powder or fluid forms a stream of aerosol particles or droplets; and
an electrode with high electric potential disposed at a distance from said nozzle and from said stream of aerosol particles or droplets, wherein the electric potential creates an electric field that charges said stream of aerosol particles or droplets. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification