Electrode assembly for an electrostatic atomizer

Patent metadata

Field	Value
Publication number	US-9901942-B2
Application number	US-201013257490-A
Country	US
Kind code	B2
Filing date	Mar 19, 2010
Priority date	Mar 19, 2009
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Various exemplary illustrations of an electrode assembly for an electrostatic atomizer, for example for a rotation atomizer, and exemplary methods of making and/or using the same, are disclosed. An exemplary electrode assembly may include an electrode holder arrangement for holding at least one electrode creating an electrostatic field about a symmetrical axis, wherein there is a dielectric material for influencing a discharge current component extending in the direction of the symmetrical axis.

First claim

The invention claimed is:

1. An electrode assembly for an electrostatic atomizer, the atomizer having an axis of symmetry and having a first housing and a second housing and an electrode holding area established by a difference in diameter between the first and second housings, the electrode holding area including a first thread, the electrode assembly comprising:
an annular electrode holding device, configured to fit around at least the first housing and for holding a plurality of electrodes that generate an electrostatic field, the electrode holding device including a second thread that engages with the thread of the electrode holding area to threadedly connect the electrode holding device to the housing,
wherein the first and second threads are coaxial to an axis of symmetry and form a labyrinth and the labyrinth is defined by a dielectric material and is configured to extend a discharge current path in a direction of the axis of symmetry; and
wherein an angle between the electrode and the axis of symmetry is greater than 40° and less than 70°.

2. Electrode assembly according to claim 1 , wherein the thread of the connection area is formed from the dielectric material.

3. Electrode assembly according to claim 1 , wherein the connection area further comprises at least one screen for forming the labyrinth, wherein the at least one screen is spaced from a resistor located in a connection area, wherein the resistor is concentric with the at least one screen and wherein the resistor is located between portions of the at least one screen.

4. Electrode assembly according to claim 3 , wherein the screen is formed from the dielectric material.

5. Electrode assembly according to claim 1 , wherein the dielectric material is provided for influencing a discharge current component of a discharge current extending in the direction of the axis of symmetry and wherein the electrode holding device is provided for holding the at least one electrode around the axis of symmetry.

6. An electrode assembly according to claim 1 , with at least one electrode which can be coupled with the electrode holding device to generate the electrostatic field, wherein the at least one electrode is contained entirely within the electrode holding device.

7. Electrode assembly according to claim 1 , wherein in at least one of the electrode holding device, an insulating material of the electrode holding device, and the dielectric material, at least one resistor is provided for preventing voltage flashovers.

8. Electrode assembly according to claim 1 , wherein the dielectric material is formed collarly projecting and the at least one electrode is encased by the dielectric material.

9. Electrode assembly according to claim 1 , wherein the dielectric material is provided to influence a further discharge current component opposed to the discharge current component less than the discharge current component.

10. Electrode assembly according claim 1 , with:
a plurality of electrodes which are arranged around the axis of symmetry and coupled with the electrode holding device, wherein the ends of the plurality of electrodes facing away from the electrode holding device are arranged along a circular path.

11. Electrode assembly according to claim 10 , wherein a ratio of a radius of the circular path to at least one of a radius of a cross-section of a spray element of the electrostatic atomizer and a radius of a cross-section of the electrode holding device is predetermined and lies within a ratio range between 2:1 and 4:1.

12. Electrode assembly according to claim 10 , wherein a ratio of a product of a radius of the circular path and a distance of the circular path to a spray element of the electrostatic atomizer to a squared diameter of the component lies in a range between 2 π and 4 π.

13. Electrode assembly according to claim 1 , with at least one electrode, which can be coupled with the electrode holding device to generate the electrostatic field, wherein the at least one electrode is encased by the dielectric material.

14. Electrode assembly according to claim 1 , wherein the thread of the connection area is arranged coaxially to the axis of symmetry.

15. Electrode assembly according to claim 3 , wherein the screens are arranged coaxially to the axis of symmetry.

16. Electrode assembly according to claim 1 , wherein the thread of the connection area is provided with an insulation medium.

17. Electrode assembly according to claim 1 , wherein the electrode holding device has a first electrical connection for contacting at least one electrode and wherein the electrode assembly has a second electrical connection for contacting the first electrical connection, wherein the second electrical connection is led to the outside.

18. Electrode assembly according to claim 1 , with external charging allowing both internal and external coating of workpieces.

19. Electrode assembly according to claim 1 , wherein the angle between the electrode and the axis of symmetry is 55 degrees.

20. Atomizer housing element for an electrostatic atomizer, wherein the electrostatic atomizer has an atomizer housing with a first housing element with a first diameter and a second atomizer housing with a second diameter, the second diameter being greater than the first diameter, wherein the housing element is suitable for receiving a support device for a spray element, the atomizer housing further comprising:
an electrode holding area defined by a difference in diameter between the first diameter and the second diameter, the electrode holding area for holding an electrode assembly; and the electrode holding area includes a screen which is received by the electrode assembly, wherein the screen defines a labyrinth, coaxial to a central axis, for a discharge current, wherein the labyrinth is defined by a dielectric material and is configured to extend discharge current path in a direction of the central axis and wherein each electrode in the electrode assembly is disposed at an angle greater than 40° and less than 70° relative to the axis of symmetry.

21. Atomizer housing element according to claim 20 , wherein the electrode holding area further comprises at least one thread for forming the at least one labyrinth coaxial to the central axis.

22. Atomizer housing element according to claim 21 , wherein the at least one thread is formed from the dielectric material.

23. Atomizer housing element according to claim 20 , wherein the screen is arranged coaxially to the central axis of the atomizer housing element.

24. Atomizer housing element according to claim 21 , further comprising:
a second thread for connecting the atomizer housing element with the housing element, wherein the first and second threads are provided at a first end of the atomizer housing element; and
a third thread for connecting the atomizer housing element with an insulating sleeve, wherein the third thread is provided at a second end of the atomizer housing element.

25. Atomizer housing element according to claim 20 , wherein the electrode holding area has at least one electrical connection for electrically contacting at least one electrical connection of the electrode assembly.

26. Atomizer housing element according to claim 24 , wherein at least one of the first thread, the second thread and the third thread is arranged coaxially to the central axis of the atomizer housing element.

27. Atomizer

Assignees

• Nolte Hans Juergen
• Fischer Andreas
• Marquardt Peter
• Berkowitsch Juergen
• Schneider Joachim
• Duerr Systems Gmbh

Inventors

• Nolte Hans Juergen
• Fischer Andreas
• Marquardt Peter
• Berkowitsch Juergen
• Schneider Joachim

Classifications

• B05B13/0457

  specially designed for applying liquid or other fluent material to three-dimensional [3D] surfaces of the work, e.g. by using several moving spray heads (B05B13/0431, B05B13/0452 take precedence) · CPC title

• B05B5/0533 Primary

  Electrodes specially adapted therefor; Arrangements of electrodes · CPC title

• B05B5/0407

  with a spraying edge, e.g. like a cup or a bell · CPC title

• B05B5/0536

  Dimensional characteristics of electrodes, e.g. diameter or radius of curvature of a needle-like corona electrode · CPC title

• B05B5/0422

  comprising means for controlling speed of rotation · CPC title