Reduced resistance skin effect heat generating system
US4645906A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1985 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Mar 4, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6606
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A skin effect heat generating pipe for use with a low frequency alternating current source includes a ferromagnetic pipe (e.g., steel) having thickness substantially greater than the penetration depth of the current of the frequency of the power source. A shunt conductor in the form of an electrically conductive metal layer (e.g., copper) is applied as a discrete layer to the inner surface of the pipe and in electrical contact therewith throughout the length of the shunt conductor, thereby forming a parallel resistance circuit wherein both the shunt conductor and pipe each are capable of conducting substantial current. One end of the pipe is electrically connectable to a first terminal of the power source. A return conductor installed in the pipe and electrically insulated therefrom has one end electrically connected to the second end of the pipe and its other end electrically connectable to the other terminal of the power source. The return conductor can be formed as a discrete inner liner conformed to the inner surface of the layer forming the shunt conductor. The shunt conductor allows a lower voltage level for a given pipe length or a longer pipe length for a given voltage leve…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.