Spray marking nozzle
First Claim
Patent Images
1. A spray marking nozzle for spraying a target material with a liquid spray using a gas transporting medium comprising:
- a substantially flat exit surface;
an exit liquid passageway in the shape of a circular cylinder with the longitudinal axis intersecting and substantially perpendicular to the exit surface;
an exit gas passageway adjacent and substantially parallel with the exit liquid passageway, the exit gas passageway being in the shape of a circular cylinder with the longitudinal axis intersecting and substantially perpendicular to the exit surface;
an inlet gas port connected to a source of pressurized gas;
an inlet liquid port connected to a source of liquid with means for controlling the liquid pressure at the inlet liquid port;
an intermediate gas passageway connecting the inlet gas port with the exit gas passageway;
an intermediate liquid passageway connecting the inlet liquid port with the exit liquid passageway;
a gas orifice which is the intersection of the exit gas passageway with the exit surface; and
a liquid orifice which is the intersection of the exit liquid passageway with the exit surface, the liquid orifice adjacent the gas orifice with adjacency being defined to assure that pressure outside the liquid orifice is controlled sufficiently according to Bernoulli'"'"'s law by a gas flow from the gas orifice so that liquid flow from the liquid orifice is reliably drawn into the gas flow, such that the gas flow transports the liquid in a crisp highly resolvable pattern to the target material, the liquid orifice being sufficiently small, and the cavity comprising the exit liquid passageway and the intermediate liquid passageway being sufficiently stiff that liquid surface tension prevents liquid from exiting the liquid orifice when liquid flow is zero at the inlet liquid port.
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Accused Products
Abstract
A spray marking nozzle includes features allowing it to perform well for fast marking of materials. The nozzle utilizes gas as a transport medium to carry liquid to the target material as a spray. Features of the nozzle allow it to be constructed economically in a compact size and to be controlled at high speed with little or no carry over spray and over a wide range of liquid and gas pressures.
22 Citations
18 Claims
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1. A spray marking nozzle for spraying a target material with a liquid spray using a gas transporting medium comprising:
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a substantially flat exit surface; an exit liquid passageway in the shape of a circular cylinder with the longitudinal axis intersecting and substantially perpendicular to the exit surface; an exit gas passageway adjacent and substantially parallel with the exit liquid passageway, the exit gas passageway being in the shape of a circular cylinder with the longitudinal axis intersecting and substantially perpendicular to the exit surface; an inlet gas port connected to a source of pressurized gas; an inlet liquid port connected to a source of liquid with means for controlling the liquid pressure at the inlet liquid port; an intermediate gas passageway connecting the inlet gas port with the exit gas passageway; an intermediate liquid passageway connecting the inlet liquid port with the exit liquid passageway; a gas orifice which is the intersection of the exit gas passageway with the exit surface; and a liquid orifice which is the intersection of the exit liquid passageway with the exit surface, the liquid orifice adjacent the gas orifice with adjacency being defined to assure that pressure outside the liquid orifice is controlled sufficiently according to Bernoulli'"'"'s law by a gas flow from the gas orifice so that liquid flow from the liquid orifice is reliably drawn into the gas flow, such that the gas flow transports the liquid in a crisp highly resolvable pattern to the target material, the liquid orifice being sufficiently small, and the cavity comprising the exit liquid passageway and the intermediate liquid passageway being sufficiently stiff that liquid surface tension prevents liquid from exiting the liquid orifice when liquid flow is zero at the inlet liquid port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A liquid spraying nozzle of one piece construction using gas as a transport medium in combination with a valving means for valving within a specified time interval the flow of liquid through the nozzle, wherein the valving means comprises:
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a valve inlet port; a valve outlet port; and a means of mounting the valving means on the nozzle to allow liquid flow between the valving means and the nozzle through the valve inlet and outlet ports; and
wherein the nozzle comprises;a substantially flat exit surface; an exit liquid passageway in the shape of a circular cylinder with the longitudinal axis intersecting and substantially perpendicular to the exit surface; an exit gas passageway adjacent and substantially parallel with the exit liquid passageway, the exit gas passageway being in the shape of a circular cylinder with the longitudinal axis intersecting and substantially perpendicular to the exit surface; an inlet gas port connected to a source of pressurized gas; an inlet liquid port connected to a source of liquid with means for controlling the liquid pressure at the inlet liquid port; an intermediate gas passageway connecting the inlet gas port with the exit gas passageway; a first intermediate liquid passageway connecting the inlet liquid port with the valve inlet port; a second intermediate liquid passageway connecting the valve outlet port with the exit liquid passageway; a gas orifice which is the intersection of the exit gas passageway with the exit surface; and a liquid orifice which is the intersection of the exit liquid passageway with the exit surface, the liquid orifice adjacent the gas orifice with adjacency being defined to assure that pressure outside the liquid orifice is controlled sufficiently according to Bernoulli'"'"'s law by a gas flow from the gas orifice so that liquid flow from the liquid orifice is reliably drawn into the gas flow, such that the gas flow transports the liquid in a crisp highly resolvable pattern to a target material, the liquid orifice being sufficiently small, and the cavity comprising the exit liquid passageway and the second intermediate liquid passageway being sufficiently stiff that liquid surface tension prevents liquid from exiting the liquid orifice when liquid flow is zero at the valve outlet port.
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13. A multiple liquid nozzle for spraying a target material with a liquid spray comprising:
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a gas orifice; a plurality of liquid orifices adjacent the gas orifice with adjacency being defined to assure that pressure outside the liquid orifices is controlled sufficiently according to Bernoulli'"'"'s law by a gas flow from the gas orifice so that liquid flows from the liquid orifices are reliably drawn into the gas flow, such that the gas flow transports the liquid in a crisp highly resolvable pattern to the target material; an inlet gas port connected to a source of pressurized gas; a plurality of inlet liquid ports, each connected to a liquid source; a plurality of liquid passageways, each connecting one liquid orifice to one inlet liquid port; and a gas passageway connecting the inlet gas port to the gas orifice, whereby a plurality of liquids can be sprayed to a common area on a surface, the liquids transported by the gas flow emanating from the gas orifice. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification