Electrostatic spray tool system

Patent metadata

Field	Value
Publication number	US-10166557-B2
Application number	US-201615059170-A
Country	US
Kind code	B2
Filing date	Mar 2, 2016
Priority date	Mar 3, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

An electrostatic spray system includes an electrostatic tool, a spray tip assembly configured to receive a coating material, and an airflow to atomize and charge the coating material, and spray the coating material in an airflow direction. The spray tip assembly includes a first air cap horn having a recess in a first distal surface, a first charging pin disposed within the recess, and a grounded pin coupled to the spray tip assembly. The first charging pin and the grounded pin are configured to produce an electric field that charges the coating material.

First claim

The invention claimed is:

1. A system, comprising:
an electrostatic spray system, comprising:
an electrostatic tool; and
a spray tip assembly configured to receive a coating material and an airflow to atomize and charge the coating material, and spray the coating material in an airflow direction, comprising:
a first air cap horn comprising a first recess on a first exterior surface at a first distal end of the first air cap horn, wherein the first recess surrounds an outlet of an aperture that extends through the first air cap horn;
a first charging pin configured to extend through the aperture and disposed within the first recess; and
a grounded pin, wherein the first charging pin and the grounded pin are configured to produce an electric field that charges the coating material.

2. The system of claim 1 , wherein the spray tip assembly comprises a second air cap horn, and the first and second air cap horns each comprise a spray shaping orifice.

3. The system of claim 2 , wherein the second air cap horn comprises a second recess on a second exterior surface at a second distal end of the second air cap horn and a second charging pin within the second recess.

4. The system of claim 3 , comprising a third recess disposed on an exterior side surface of the spray tip assembly between the first air cap horn and the second air cap horn, wherein the third recess comprises a third charging pin.

5. The system of claim 1 , wherein a tip of the first charging pin is positioned between 1 mm above the first distal end and 5 mm below the first distal end.

6. The system of claim 1 , comprising a cascade voltage multiplier configured to provide a voltage to the first charging pin.

7. The system of claim 6 , wherein the spray tip assembly comprises a wire electrically coupled to the cascade voltage multiplier, an electrode electrically coupled to the first charging pin, and a conductive pin removably coupled between the wire and the electrode.

8. The system of claim 7 , wherein the conductive pin comprises a conductive plastic.

9. A system, comprising:
an air atomization cap configured to couple to a body of an electrostatic tool system, comprising:
an atomization orifice configured to atomize a liquid material;
a distal exterior surface around the atomization orifice;
a first recess disposed on the distal exterior surface, wherein the first recess surrounds an outlet of an aperture in the air atomization cap;
a first pin configured to extend through the aperture and disposed within the first recess; and
a center pin disposed within the atomization orifice, wherein the first pin and the center pin are configured to propagate an electric field.

10. The system of claim 9 , wherein the first pin comprises a pointed shape, a bulbed shape, a fan shape, or any combination thereof.

11. The system of claim 9 , wherein the air atomization cap comprises a second recess disposed on the distal exterior surface, and a second pin disposed within the second recess, and the first recess and the second recess are on opposite sides of the center pin.

12. The system of claim 11 , wherein the center pin is electrically charged and the first pin and the second pin are grounded.

13. The system of claim 9 , wherein a tip of the first pin is positioned between 1 mm above the distal exterior surface and 5 mm below the distal exterior surface.

14. The system of claim 9 , wherein the first pin is angled between 10 and 90 degrees relative to an axis of the air atomization cap.

15. The system of claim 9 , wherein the center pin comprises a wire protruding from the air atomization cap.

16. The system of claim 9 , wherein the center pin comprises a tip that is flush with the distal exterior surface.

17. A system, comprising:
an electrostatic spray device, comprising:
a first outlet configured to output a spray material into a region downstream from the first outlet;
a first conductive member disposed in a first recess of an exterior surface of the electrostatic spray device, wherein the first recess surrounds an outlet of an aperture and the first conductive member is configured to extend through the aperture and beyond the exterior surface; and
a second conductive member offset from the first conductive member, wherein the first and second conductive members are configured to help generate an electric field in the region downstream from the first outlet.

18. The system of claim 17 , wherein the first conductive member comprises a first charging member.

19. The system of claim 18 , wherein the second conductive member comprises a second charging member disposed in a second recess of the exterior surface of the electrostatic spray device.

20. The system of claim 18 , wherein the second conductive member comprises a grounding member.

21. The system of claim 17 , wherein the first recess and the first conductive member are offset away from the first outlet.

22. The system of claim 17 , wherein the first recess and the first conductive member are disposed in a first horn of the electrostatic spray device.

23. The system of claim 17 , wherein the first recess curves inwardly.

24. The system of claim 17 , wherein the electrostatic spray device comprises a spray head having the first outlet, the first conductive member, and the second conductive member.

Assignees

• Carlisle Fluid Tech Inc

Inventors

• Seitz David Martin

Classifications

• B05B5/0535

  at least two electrodes having different potentials being held on the discharge apparatus, one of them being a charging electrode of the corona type located in the spray or close to it, and another being of the non-corona type located outside of the path for the material · CPC title

• B05B5/0533

  Electrodes specially adapted therefor; Arrangements of electrodes · CPC title

• B05B5/0532

  driven by a gas turbine · CPC title

• B05B5/03 Primary

  characterised by the use of gas {, e.g. electrostatically assisted pneumatic spraying (B05B5/04, B05B5/043, B05B5/047 take precedence)} · CPC title

• B05B7/1209

  the controlling means for each liquid or other fluent material being manual and interdependent · CPC title