Patent ID: 7017571
Filing Date: 2006-03-28
Classification: F24C

Abstract:
1. A heat exchanger device for a gas-heated cooking appliance, comprising: a fan wheel for inducing circulation of a treatment medium in a cooking appliance, said fan wheel having a fan wheel axis of rotation; a gas burner; at least one heat exchanger pipe surrounding said fan wheel and connected to said burner by a gas-tight sealed connection, said at least one heat exchanger pipe comprising first and second ends, an initial region at said first end defining a combustion chamber for accommodating said burner that is enlarged in diameter relative to said at least one heat exchanger pipe, said combustion chamber having a longitudinal axis extending essentially in a tangential direction relative to said fan wheel and being arranged proximate said fan wheel, said burner having a longitudinal axis extending parallel to the longitudinal axis of said combustion chamber, wherein said burner comprises a pipe section having a closed end and gas outlet openings distributed on a circumference of said pipe section, and wherein each of said gas outlet opening defines an axis in a direction of flow in said each of said gas outlet openings, said axes of said gas outlet openings being inclined obliquely at an acute angle with respect to a longitudinal axis of said burner; and a mixing device for setting a ratio of a gas/air mixture required for combustion, said mixing device including a fan for conveying the gas/air mixture to said burner and, after combustion, into said at least one heat exchanger pipe.