Temperature control apparatus
US4359210A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1981 |
| Grant date | Nov 16, 1982 |
| Priority date | — |
| Expiry date | Jan 21, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2213/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus for controlling furnace temperature particularly in an annealing furnace used for annealing elongated product, such as pipe and tubing, on a continuous basis. The apparatus includes a pyrometer used to produce an electrical signal proportional to the temperature of the workpiece immediately after heating by an induction coil in the furnace, means for comparing this electrical signal to a set point signal proportional to the desired temperature of the workpiece and if these signals differ a control signal is produced to either increase or decrease the power input to the induction coil to correspondingly increase or decrease the temperature of the workpiece to the desired temperature. The comparison of the pyrometer signal and the set point signal is made at time intervals corresponding to the speed of the product through the furnace and the distance between the induction coil and the pyrometer so that in the presence of an error signal indicating temperature deviation from the set point a second error signal is not produced until the affect of the power level correction in response to the first error signal is effected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.