Electrostatic sprayhead assembly
First Claim
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1. An electrostatic sprayhead assembly, comprising:
- an electrostatic spray head;
means connected to said spray head for supplying liquid to said spray head;
a source of high voltage;
means connecting said spray head with said source of high voltage for charging said spray head to a high voltage as liquid is supplied to said spray head, thereby coacting with said spray head for atomizing that liquid predominantly by means of said high voltage, as such liquid issues from said sprayhead;
means for forming a gas stream having a velocity along a path in a spraying direction;
said spray head being located within or closely adjacent to said gas stream path such that at least some of the atomized liquid issued from said sprayhead in use become entrained in said gas stream for transport in said direction therewith;
said gas stream forming means including;
means for forming a first, lower velocity gas stream region located closer to said spray head in a direction transversally of said path, this means having an inlet and an outlet;
means for forming a second, high velocity gas stream region located further from said sprayhead in a direction transversally of said path, with said first, lower velocity gas stream region intervening between said sprayhead and said second higher velocity gas stream region, this means also having an inlet and an outlet; and
an outlet of said sprayhead being disposed at or near the same location in said spraying direction as said outlet of said means for forming said first, lower velocity gas stream region.
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Abstract
An electrostatic spray head is charged with high voltage from a high voltage source. As a liquid to be sprayed is supplied to the spray head, the liquid is atomized predominately due to the high voltage. The spray head is located within or closely adjacent to a gas stream flowing along a path which extends in the spraying direction, so that at least some of the atomized liquid becomes entrained in the gas stream. The gas stream has a lower velocity region and a high velocity region, of which the lower velocity region is transversally closer to the spray head.
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Citations
14 Claims
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1. An electrostatic sprayhead assembly, comprising:
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an electrostatic spray head;
means connected to said spray head for supplying liquid to said spray head;
a source of high voltage;
means connecting said spray head with said source of high voltage for charging said spray head to a high voltage as liquid is supplied to said spray head, thereby coacting with said spray head for atomizing that liquid predominantly by means of said high voltage, as such liquid issues from said sprayhead;means for forming a gas stream having a velocity along a path in a spraying direction; said spray head being located within or closely adjacent to said gas stream path such that at least some of the atomized liquid issued from said sprayhead in use become entrained in said gas stream for transport in said direction therewith; said gas stream forming means including; means for forming a first, lower velocity gas stream region located closer to said spray head in a direction transversally of said path, this means having an inlet and an outlet; means for forming a second, high velocity gas stream region located further from said sprayhead in a direction transversally of said path, with said first, lower velocity gas stream region intervening between said sprayhead and said second higher velocity gas stream region, this means also having an inlet and an outlet; and an outlet of said sprayhead being disposed at or near the same location in said spraying direction as said outlet of said means for forming said first, lower velocity gas stream region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification