Spark gap with triple-point electron emission prompting

Patent metadata

Field	Value
Publication number	US-9806501-B1
Application number	US-201615239503-A
Country	US
Kind code	B1
Filing date	Aug 17, 2016
Priority date	Aug 17, 2016
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The present approach relates to generating seed electrons at a spark gap in the absence of 85 Kr. The present approach utilizes electron emission from a triple-point instead to provide seed electrons to reduce the statistical time lag of a spark gap. In one such implementation, a spark gap a spark gap may be fabricated and/or operated without a radioactive component without otherwise changing its overall form or function of the spark gap.

First claim

The invention claimed is:

1. A spark gap, comprising:
a first electrode having a first surface; and
a second electrode having a second surface spaced apart from and facing the first surface, wherein the second surface comprises a conductive inner region and a substantially insulating peripheral region defining a boundary therebetween, wherein the boundary generates free electrons via a triple point emission effect when the spark gap is operated.

2. The spark gap of claim 1 , wherein the first surface also comprises an additional conductive inner region and an additional substantially insulating peripheral region.

3. The spark gap of claim 1 , wherein the first electrode comprises an anode and the second electrode comprises a cathode.

4. The spark gap of claim 1 , wherein the conductive inner region comprises a conductive metal.

5. The spark gap of claim 1 , wherein the substantially insulating peripheral region comprises one or more of a ceramic or an oxide.

6. The spark gap of claim 1 , wherein the substantially insulating peripheral region has an annular geometry so as to define a circular boundary between the conductive inner region and the substantially insulating peripheral region.

7. The spark gap of claim 1 , wherein the substantially insulating peripheral region has an irregular or jagged geometry so as to define an irregular boundary between the conductive inner region and the substantially insulating peripheral region.

8. The spark gap of claim 1 , wherein the substantially insulating peripheral region comprises a plurality of separate insulating sub-regions forming a discontinuous pattern of insulating material.

9. The spark gap of claim 1 , wherein the spark gap does not include a radioactive component.

10. An ignition device, comprising:
one or more igniters configured to ignite a fuel stream or vapor during operation; and one or more exciter components, each connected to a respective igniter, wherein each exciter component comprises a spark gap having a triple emission point that generates free electrons when the spark gap is operated, wherein the spark gap comprises:
a first electrode having a first surface; and
a second electrode having a second surface spaced apart from and facing the first surface, wherein the second surface comprises a conductive inner region and a substantially insulating peripheral region forming a boundary therebetween, wherein the triple emission point corresponds to the boundary formed between the conductive inner region and the substantially insulating peripheral region.

11. The ignition device of claim 10 , wherein the first surface comprises an additional conductive inner region and an additional substantially insulating peripheral region.

12. The ignition device of claim 10 , wherein the first electrode is an anode and the second electrode is a cathode.

13. The ignition device of claim 10 , wherein the conductive inner region comprises a conductive metal and the substantially insulating peripheral region comprises a ceramic or oxide material.

14. The ignition device of claim 10 , wherein the substantially insulating peripheral region is formed as a pattern or layer of conducting material on the second surface or as a separate insulating component fitted to the second electrode to form a peripheral region of the second surface.

15. A method for generating a conductive plasma, comprising:
applying a voltage across a spark gap comprising a first electrode and a second electrode, wherein the first electrode comprises a surface facing the second electrode that has a conductive inner region and a substantially insulating peripheral region forming a boundary therebetween;
generating free electrons at the boundary between the conductive inner region and the substantially insulating peripheral region via a triple point emission effect when the spark gap is operated; and
subsequent to generating the free electrons, generating the conductive plasma across the spark gap.

16. The method of claim 15 , further comprising igniting a fuel stream or vapor at a downstream igniter component in response to the conductive plasma bridging the spark gap.

17. The method of claim 15 , wherein free electrons are not generated by a radioactive isotope.

Assignees

• Gen Electric

Inventors

• Sommerer Timothy John

Classifications

• F23N2227/36

  Spark ignition, e.g. by means of a high voltage · CPC title

• H01T1/20

  Means for starting arc or facilitating ignition of spark gap · CPC title

• H01T4/10

  having a single gap or a plurality of gaps in parallel · CPC title

• F23Q3/00

  Igniters using electrically-produced sparks (sparking-plugs H01T13/00) · CPC title

• F05D2220/323

  for aircraft propulsion, e.g. jet engines · CPC title