Apparatus for applying a liquid coating with an improved spray nozzle

A system for spray coating a substrate with a liquid coating material, comprising:

• a liquid spray device having a liquid delivery passageway for supplying liquid coating material and an air delivery passageway for supplying pressurized air;
• a nozzle mounted to said liquid spray device having a discharge outlet at one end and having a throughbore in flow communication with said liquid delivery passageway to discharge said liquid coating material as a bead of liquid coating material from said discharge outlet, said nozzle including a plurality of air bores in flow communication with said air delivery passage to direct pressurized air against the outer periphery of said bead of liquid coating material discharged from said discharge outlet to form said liquid coating material into an atomized spray pattern with said liquid coating material swirling within said atomized spray pattern;
• said air bores being in air flow communication with said air delivery passageway;
• said air bores being angled to direct jets of air therefrom to impinge substantially tangential to said outer periphery of said bead of coating material to atomize said bead into a conical spray pattern with said liquid coating material swirling within said conical spray pattern;
• and
• a controller operatively connected to said liquid spray device for selectively opening and closing said air delivery passageway of said liquid spray device whereby said bead of liquid coating material discharged from said discharge outlet is applied to said substrate either as said swirling atomized spray pattern or as said bead of said liquid coating material.

A system for spray coating a substrate with a liquid coating material, comprising:

• a liquid spray device having a liquid delivery passageway for supplying liquid coating material and an air delivery passageway for supplying pressurized air;
• a valve shaft movable between an retracted open position in which the lower end of said valve shaft is spaced from a valve seat and uncovers a discharge outlet therein, and an extended closed position in which said lower end of the valve shaft engages said valve seat and blocks said discharge outlet to control the discharge of coating material from said liquid spray device;
• a nozzle mounted to said liquid spray device in close proximity to the valve seat, said nozzle having a nozzle tip extending outwardly therefrom and having a throughbore in flow communication with said liquid delivery passageway with a nozzle orifice disposed at the end of said throughbore to discharge said liquid coating material as a bead of liquid coating material, said nozzle including a plurality of air bores in flow communication with said air delivery passageway to direct pressurized air against the outer periphery of said bead of liquid coating material discharged from said nozzle tip to form said liquid coating material into an atomized spray pattern with said liquid coating material swirling within said atomized spray pattern;
• said air bores being in air flow communication with said air delivery passageway by a common opening;
• said air bores being angled to direct jets of air therefrom to impinge substantially tangential to said outer periphery of said bead of coating material to atomize said bead into a conical spray pattern with said liquid coating material swirling within said conical spray pattern;
• and
• a controller operatively connected to said liquid spray device for selectively opening and closing said air delivery passageway of said liquid spray device whereby said bead of liquid coating material discharged from said nozzle orifice is applied to said substrate either as said swirling atomized spray pattern or as said bead of said liquid coating material.

A system for spray coating a substrate with a liquid coating material, comprising:

• a liquid spray device having a liquid delivery passageway for supplying liquid coating material and an air delivery passageway for supplying pressurized air;
• a nozzle mounted to said liquid spray device having an elongated nozzle tip extending outwardly therefrom and having a throughbore in flow communication with said liquid delivery passageway with a nozzle orifice disposed at the end of said throughbore to discharge said liquid coating material as a bead of liquid coating material, said elongated nozzle tip including a tube extending outward from said nozzle, said tube having said nozzle orifice disposed at one end to discharge said liquid coating material as said bead of liquid coating material;
• said nozzle including a plurality of air bores in flow communication with said air delivery passage to direct pressurized air against the outer periphery of said bead of liquid coating material discharged from said elongated nozzle tip to form said liquid coating material into an atomized spray pattern with said liquid coating material swirling within said atomized spray pattern;
• said nozzle being formed with at least six bores in flow communication with said air delivery passage, said air bores being formed at an angle with respect to said throughbore;
• and
• a controller operatively connected to said liquid spray device for selectively opening and closing said air delivery passageway of said liquid spray device whereby said bead of liquid coating material discharged from said nozzle orifice is applied to said substrate either as said swirling atomized spray pattern or as said bead of said liquid coating material.

A system for spray coating a substrate with a liquid coating material, comprising:

• a liquid spray device having a liquid delivery passageway for supplying liquid coating material and an air delivery passageway for supplying pressurized air;
• a valve shaft movable between an retracted open position in which the lower end of said valve shaft is spaced from a valve seat and uncovers a discharge outlet therein, and an extended closed position in which said lower end of the valve shaft engages said valve seat and blocks said discharge outlet to control the discharge of coating material from said liquid spray device;
• a nozzle mounted to said liquid spray device in close proximity to the valve seat, said nozzle having an elongated nozzle tip extending outwardly therefrom and having a throughbore in flow communication with said liquid delivery passageway with a nozzle orifice disposed at the end of said throughbore to discharge said liquid coating material as a bead of liquid coating material, said elongated nozzle tip including a tube extending outward from said nozzle, said tube having said nozzle orifice disposed at one end to discharge said liquid coating material as said bead of liquid coating material;
• said nozzle including a plurality of air bores in flow communication with said air delivery passageway to direct pressurized air against the outer periphery of said bead of liquid coating material discharged from said elongated nozzle tip to form said liquid coating material into an atomized spray pattern with said liquid coating material swirling within said atomized spray pattern;
• said nozzle being formed with at least six bores in flow communication with said air delivery passage, said air bores being formed at an angle with respect to said throughbore;
• and
• a controller operatively connected to said liquid spray device for selectively opening and closing said air delivery passageway of said liquid spray device whereby said bead of liquid coating material discharged from said nozzle orifice is applied to said substrate either as said swirling atomized spray pattern or as said bead of said liquid coating material.