Fluid through needle for applying multiple component material
View Patent ↗Embodiments of a spray gun incorporating a needle for applying multiple component materials are provided. In accordance with certain embodiments, the spray gun includes a fluid delivery tip assembly comprising an inner passage, a hollow needle disposed within the inner passage of the fluid delivery tip assembly, wherein the hollow needle comprises at least two indentions along an outer circumferential surface of the hollow needle near an end of the hollow needle, a first passage configured to deliver a first spray fluid to a fluid tip exit of the fluid delivery tip assembly, wherein the first passage is defined by a volume between the fluid delivery tip assembly and the hollow needle, and a second passage through the hollow needle, wherein the second passage is configured to deliver a second spray fluid to the fluid tip exit of the fluid delivery tip assembly.
1. A spray coating gun, comprising:
a fluid delivery tip assembly comprising an inner passage;
a hollow needle disposed within the inner passage of the fluid delivery tip assembly, wherein the hollow needle is a unitary body comprising an outer circumferential surface, wherein the outer circumferential surface comprises at least two indentions near an end of the hollow needle;
a first passage configured to deliver a first spray fluid to a fluid tip exit of the fluid delivery tip assembly through the at least two indentions, wherein the first passage is defined by a volume between the fluid delivery tip assembly and the hollow needle; and
a second passage through the hollow needle, wherein the second passage is configured to deliver a second spray fluid to the fluid tip exit of the fluid delivery tip assembly.
2. The spray coating gun of claim 1 , wherein the hollow needle comprises an exit hole at the end of the hollow needle through which the second spray fluid is delivered.
3. The spray coating gun of claim 1 , wherein the hollow needle comprises exit holes extending at least partially radially from a hollow center of the hollow needle, wherein the second spray fluid is delivered through the exit holes.
4. The spray coating gun of claim 1 , wherein the first spray fluid is delivered to the first passage from a first spray fluid inlet passage, and the second spray fluid is delivered to the second passage from a second spray fluid inlet passage, wherein the second spray fluid inlet passage is coaxial with the first spray fluid inlet passage.
5. The spray coating gun of claim 4 , wherein the hollow needle comprises cross holes extending from a hollow center of the hollow needle to the outer circumferential surface of the hollow needle, wherein the cross holes fluidly connect the second spray fluid inlet passage to the second passage.
6. The spray coating gun of claim 4 , wherein the first spray fluid is delivered to the first spray fluid inlet passage from a first spray fluid cup, and the second spray fluid is delivered to the second spray fluid inlet passage from a second spray fluid cup, wherein the second spray fluid cup is located within the first spray fluid cup.
7. The spray coating gun of claim 1 , comprising a trigger configured to control flow of both the first spray fluid and the second spray fluid to the fluid tip exit of the fluid delivery tip assembly.
8. The spray coating gun of claim 7 , wherein movement of the trigger moves the hollow needle away from the fluid tip exit of the fluid delivery tip assembly, enabling flow of the first spray fluid through the fluid tip exit of the fluid delivery tip assembly.
9. The spray coating gun of claim 7 , wherein movement of the trigger actuates a valve, enabling flow of the second spray fluid through the hollow needle.
10. The spray coating gun of claim 1 , wherein the fluid delivery tip assembly comprises guides extending from an inner wall of the fluid delivery tip assembly toward the hollow needle, wherein the guides are configured to ensure that the hollow needle moves coaxially within the inner passage.
11. The spray coating gun of claim 1 , wherein the outer circumferential surface comprises at least three indentions and edges between the at least three indentions, wherein the edges are configured to abut the fluid tip exit.
12. The spray coating gun of claim 11 , wherein the at least three indentions comprise convex segments of the outer circumferential surface.
13. A spray coating gun, comprising:
a fluid delivery tip assembly comprising an inner passage;
a hollow needle disposed within the inner passage of the fluid delivery tip assembly, wherein the hollow needle comprises exit holes extending at least partially radially from a hollow center of the hollow needle;
a first passage configured to deliver a first spray fluid to a fluid tip exit of the fluid delivery tip assembly, wherein the first passage is defined by a volume between the fluid delivery tip assembly and the hollow needle, and the first spray fluid is delivered to the first passage from a first spray fluid inlet passage; and
a second passage through the hollow needle, wherein the second passage is configured to deliver a second spray fluid to the fluid tip exit of the fluid delivery tip assembly through the exit holes of the hollow needle, the second spray fluid is delivered to the second passage from a second spray fluid inlet passage, and the second spray fluid inlet passage is coaxial with the first spray fluid inlet passage.
14. The spray coating gun of claim 13 , wherein the hollow needle comprises cross holes extending from a hollow center of the hollow needle to an exterior circumferential surface of the hollow needle, wherein the cross holes fluidly connect the second spray fluid inlet passage to the second passage.
15. The spray coating gun of claim 13 , wherein the first spray fluid is delivered to the first spray fluid inlet passage from a first spray fluid cup, and the second spray fluid is delivered to the second spray fluid inlet passage from a second spray fluid cup, wherein the second spray fluid cup is located within the first spray fluid cup.
16. The spray coating gun of claim 14 , wherein the first fluid comprises a paint, and the second fluid comprises an activator.
17. A spray coating gun, comprising:
a fluid delivery tip assembly comprising an inner passage;
a hollow needle disposed within the inner passage of the fluid delivery tip assembly;
a first passage configured to deliver a first spray fluid to a fluid tip exit of the fluid delivery tip assembly, wherein the first passage is defined by a volume between the fluid delivery tip assembly and the hollow needle; and
a second passage through the hollow needle, wherein the second passage is configured to deliver a second spray fluid to the fluid tip exit of the fluid delivery tip assembly;
wherein the first spray fluid is delivered to the first passage from a first spray fluid inlet passage, the first spray fluid is delivered to the first spray fluid inlet passage from a first spray fluid cup, the second spray fluid is delivered to the second passage from a second spray fluid inlet passage, the second spray fluid is delivered to the second spray fluid inlet passage from a second spray fluid cup, the second spray fluid inlet passage is coaxial with the first spray fluid inlet passage, and the second spray fluid cup is located within the first spray fluid cup.
18. The spray coating gun of claim 17 , wherein the hollow needle comprises an exit hole at the end of the hollow needle through which the second spray fluid is delivered.
19. The spray coating gun of claim 17 , wherein the hollow needle comprises exit holes extending at least partially radially from a hollow center of the hollow needle, wherein the second spray fluid is delivered through the exit holes.
20. The spray coating gun of claim 17 , wherein the hollow needle comprises cross holes extending from a hollow center of the hollow needle to an exterior circumferential surface of the hollow needle, wherein the cross holes fluidly connect the second spray fluid inlet passage to the second passage.