Illinois Tool Works Inc.
Convection system for employment with an RF oven

Abstract:

An air circulation system for an oven includes a plenum disposed proximate to the cooking chamber, an airflow generator configured to draw air from the cooking chamber through a chamber outlet port and discharge the air into the plenum, and an air heater configured to heat at least some of the air in the plenum prior to a portion of the air entering the cooking chamber from the plenum via air delivery orifices. The chamber outlet port includes outlet perforations combining to form a first geometric shape centered on an axis of the airflow generator. The air delivery orifices include a first set of inlet perforations and a second set of inlet perforations. The first and second sets of inlet perforations combine to form respective second and third geometric shapes that are disposed on opposite sides of the outlet perforations. The second and third geometric shapes are different than the first geometric shape.