Device for cleaning the walls of the muffle chamber of baking and roasting ovens

Claim 1

In a baking and roasting oven with a muffle chamber having a top and a bottom wall and side walls, one of the side walls being formed with an admission opening closable by a door, the walls and the door being backed by thermal insulation material, the muffle chamber communicating with the surroundings through a vapor discharge outlet and having therein electrical heating means for heating food to be processed therein, a device for cleaning the walls of the muffle chamber comprising an inlet and an outlet to said muffle chamber located in a wall of said muffle chamber, said outlet being located in another of the side walls located opposite the door; an air guide located outside the muffle chamber and connecting said inlet and said outlet; said air guide including impeller means capable of impelling gas through the air guide from the inlet to the outlet and an electrical heating element, locking means for locking the door in the closed position thereof, a flap located adjacent the vapor discharge outlet for closing the discharge outlet, and means for energizing the electrical heating means simultaneously with said impeller means and said heating element in order to heat the atmosphere in the muffle chamber to a temperature in the range of 450* to 570* C. when the walls are to be cleaned, the door being locked and said discharge outlet being closed when the temperature of the atmosphere in the muffle chamber is within said range,so as to prevent escape of the heated atmosphere from the muffle chamber.