Powder coating gun mounted diffuser and air cooled heat sink in combination with low flow powder pump improvements
First Claim
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1. The method of delivering a stream of air entrained charging powder to a spray gun comprising the steps of:
- providing a spray gun with a nozzle section, a high voltage power supply, a heat sink plate abutted against said high voltage power supply, and a diffuser mounted to said heat sink plate and connected to said nozzle section by a conduit;
directing a stream of air entrained powder through said diffuser and through said conduit to said nozzle section of said spray gun;
directing compressed air through said heat sink plate and into said stream of air entrained powder in said diffuser to redistribute said air entrained powder in said stream of air entrained powder being directed through said diffuser and to direct said stream of redistributed air entrained powder into said conduit and to said nozzle section while transferring heat generated by said high voltage power supply from said heat sink plate to said compressed air.
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Abstract
Apparatus and methods for pumping a uniform flow of air entrained powder at low flow settings to a diffuser of an electrostatic spray gun which disperses the powder and cools the spray gun. A single or double stage pump with a bleed port design draws powder into the pump from a powder container when compressed air directed into the pump is above a predetermined pressure. In another embodiment, a pump delivers a constant velocity of air entrained powder to the spray gun.
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Citations
12 Claims
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1. The method of delivering a stream of air entrained charging powder to a spray gun comprising the steps of:
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providing a spray gun with a nozzle section, a high voltage power supply, a heat sink plate abutted against said high voltage power supply, and a diffuser mounted to said heat sink plate and connected to said nozzle section by a conduit; directing a stream of air entrained powder through said diffuser and through said conduit to said nozzle section of said spray gun; directing compressed air through said heat sink plate and into said stream of air entrained powder in said diffuser to redistribute said air entrained powder in said stream of air entrained powder being directed through said diffuser and to direct said stream of redistributed air entrained powder into said conduit and to said nozzle section while transferring heat generated by said high voltage power supply from said heat sink plate to said compressed air. - View Dependent Claims (2)
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3. A spray gun for electrostatically charging powder emitted from a nozzle section thereof, comprising:
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a spray gun housing; a high voltage power supply which generates heat mounted within said gun housing; a thermally conductive support bracket mounted to said high voltage power supply, said support bracket having a support bracket air passage connected to a source of compressed air therethrough; and a diffuser mounted to said support bracket, said diffuser having a diffuser air passage in communication with said support bracket air passage for injecting compressed air into a stream of air entrained powder flowing to a nozzle section and for cooling said gun housing. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification