Furnace with multiple electric induction heating sections particularly for use in galvanizing line
US6180933A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 2000 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Feb 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2206/023
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A furnace for heating ferrous metal workpiece is made up of a plurality of pairs of furnace sections with each pair of furnace section having a longitudinal flux inductors with controls for rapidly adjusting the heating rate according to a desired workpiece discharged temperature from the second of the furnace sections. The second furnace is controlled to maintain a substantially constant workpiece heating temperature. A second pair of furnace sections is provided with a first furnace section utilizing coil pairs with a dual output power supply having independent phase adjustable output currents to vary the current phase relation between the coils between 0 and 180.degree.. The change to the phase relation is used to maintain efficient heating of the metal strip above the Curie temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.