Voltage application device and discharge device

Patent metadata

Field	Value
Publication number	US-11786922-B2
Application number	US-201917262153-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
Priority date	Aug 29, 2018
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

A voltage application device includes a voltage application circuit. The voltage application circuit applies application voltage between discharge electrode and counter electrode which face each other with a clearance left from each other to generate a discharge. The voltage application device forms discharge path partially and dielectrically broken between discharge electrode and counter electrode when a discharge is generated. Discharge path includes first dielectric breakdown region formed around discharge electrode, and second dielectric breakdown region formed around counter electrode.

First claim

The invention claimed is:

1. A voltage application device comprising a voltage application circuit that generates a discharge by applying an application voltage between a discharge electrode and a counter electrode which face each other with a clearance left from each other, wherein:
the voltage application circuit is configured to form a discharge path that is partially and dielectrically broken and located between the discharge electrode and the counter electrode when the discharge is generated,
the discharge path that is partially and dielectrically broken includes
a first dielectric breakdown region generated around the discharge electrode,
a second dielectric breakdown region generated around the counter electrode, and
a region not dielectrically broken and formed between the first dielectric breakdown region and the second dielectric breakdown region.

2. The voltage application device according to claim 1 , wherein
the discharge electrode holds a liquid, and
the liquid is electrostatically atomized by the discharge.

3. The voltage application device according to claim 1 , wherein the voltage application circuit periodically changes magnitude of the application voltage to generate the discharge intermittently.

4. The voltage application device according to claim 1 , wherein
the first dielectric breakdown region extends from the discharge electrode toward the counter electrode, and
the second dielectric breakdown region extends from the counter electrode toward the discharge electrode.

5. A discharge device comprising:
a discharge electrode;
a counter electrode which face the discharge electrode with a clearance left from the discharge electrode; and
a voltage application circuit that generates a discharge by applying an application voltage between the discharge electrode and the counter electrode, wherein:
the voltage application circuit is configured to form a discharge path that is partially and dielectrically broken and located between the discharge electrode and the counter electrode when the discharge is generated, and
the discharge path that is partially and dielectrically broken includes
a first dielectric breakdown region generated around the discharge electrode,
a second dielectric breakdown region generated around the counter electrode, and
a region not dielectrically broken and formed between the first dielectric breakdown region and the second dielectric breakdown region.

6. The discharge device according to claim 5 , further comprising a liquid supply unit that supplies the liquid to the discharge electrode.

7. The discharge device according to claim 5 , wherein the counter electrode includes a support portion, and a projecting portion projecting from the support portion toward the discharge electrode.

8. The discharge device according to claim 7 , wherein a tip surface of the projecting portion includes a curved surface.

9. The discharge device according to claim 8 , wherein a radius of curvature of the tip surface of the projecting portion is more than or equal to ½ of a radius of curvature of a tip surface of the discharge electrode.

10. The discharge device according to claim 7 , wherein a projection amount of the projecting portion from the support portion is less than or equal to ⅔ of a distance between the discharge electrode and the counter electrode.

11. The voltage application device according to claim 1 , wherein, in the discharge to form the discharge path that is partially and dielectrically broken, energy associated with the discharge is suppressed to be small as compared with a complete breakdown discharge where the discharge path is entirely and dielectrically broken and located between the discharge electrode and the counter electrode.

12. The voltage application device according to claim 1 , wherein, in the discharge where the discharge path that is partially and dielectrically broken, concentration of an electric field is reduced as compared with a complete breakdown discharge where the discharge path is entirely and dielectrically broken and located between the discharge electrode and the counter electrode.

13. The voltage application device according to claim 5 , wherein, in the discharge to form the discharge path that is partially and dielectrically broken, energy associated with the discharge is suppressed to be small as compared with a complete breakdown discharge where the discharge path is entirely and dielectrically broken and located between the discharge electrode and the counter electrode.

14. The voltage application device according to claim 5 , wherein, in the discharge where the discharge path that is partially and dielectrically broken, concentration of an electric field is reduced as compared with a complete breakdown discharge where the discharge path is entirely and dielectrically broken and located between the discharge electrode and the counter electrode.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• AONO Tetsunori
• Oe Jumpei
• Ishigami Yohei
• Shimizu Kana
• Omori Takafumi
• Nakano Yukari
• Nakada Takayuki

Classifications

• B05B5/007 Primary

  the high voltage supplied to an electrostatic spraying apparatus during spraying operation being periodical or in time, e.g. sinusoidal · CPC title

• B05B5/006

  the adjustement of high voltage is responsive to a condition, e.g. a condition of material discharged, of ambient medium or of target · CPC title

• B05B5/0536

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

• H01T19/04

  having pointed electrodes · CPC title

• H05H1/48 Primary

  using an arc (H05H1/26 takes precedence) · CPC title