Patent ID: 6837234
Filing Date: 2005-01-04
Classification: A21B

Abstract:
1. In a convection oven including a baking chamber, a door providing access to the baking chamber, and a blower for circulating hot air along a heated air flow path that passes through the baking chamber, a heat exchanger comprising: a plurality of heat exchange tubes extending across a portion of the heated air flow path outside the baking chamber, each heat exchange tube including an input end associated with a first linear segment, an output end associated with a second linear segment and a bend connecting the first linear segment to the second linear segment such that the second linear segment extends substantially parallel to the first linear segment, the plurality of heat exchange tubes including a first heat exchange tube, a second heat exchange tube and one or more heat exchange tubes disposed between the first and second heat exchange tubes with the first, second and one or more heat exchange tubes arranged vertically to align the first linear segments of the first, second and one or more heat exchange tubes in a first substantially vertical plane and to align the second linear segments of the first, second and one or more heat exchange tubes in a second substantially vertical plane, where the first substantially vertical plane is offset laterally from the second substantially vertical plane; and a plurality of gas burners, each burner associated with a respective input end of a respective heat exchange tube for delivering combustion gases through the respective heat exchange tube.