Corona suppression at the high voltage joint through introduction of a semi-conductive sleeve between the central electrode and the dissimilar insulating materials
US9755405B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2016 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Mar 22, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A corona ignition assembly comprising a plurality of different insulators disposed between an ignition coil assembly and firing end assembly is provided. A high voltage center electrode extends longitudinally between an igniter central electrode and the ignition coil assembly. A high voltage insulator formed of a fluoropolymer surrounds the high voltage center electrode, and a firing end insulator firing of alumina surrounds the igniter central electrode. A sleeve formed of a semi-conductive and complaint material, such as silicone rubber with conductive filler, is disposed radially between the electrodes and adjacent insulators. The sleeve fills air gaps and minimizes the peak electric field within the corona igniter assembly. The sleeve is able to prevent unwanted corona discharge, and thus extends the life of the materials and directs energy to the firing end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.