Patent ID: 6503078
Filing Date: 2003-01-07
Classification: F27B

Abstract:
A heating furnace of natural convection type comprising:a furnace body having an inner heating chamber and provided with an inlet port through which an article to be heated is conveyed into the furnace body and an outlet port through which the article is discharged from the furnace body; conveying means for supporting the article to be heated and conveying the article through the heating chamber of the furnace body; heating means disposed on at least one of a side portion and a top side portion of the furnace body and exposed to an interior of the heating chamber for heating air in the heating chamber to heat the article; exhaust means formed on a bottom portion of the furnace body at a predetermined distance from the heating means for discharging the heated air from the heating chamber after the heated air has been cooled, the exhaust means having an upper end positioned below the article to be heated in the heating chamber of the furnace body; and an air inlet port provided below the exhaust means in association with the heating means.