Abstract: A conductive structure of the heat exchange pipe is provided for conducting heat generated by combustion inside a burner to the outside. The heat exchange pipe includes a receptacle and an insertion. The insertion is disposed in the receptacle. The insertion includes at least two petals, each of which includes a plurality of circular arc sections that extend toward a middle of the receptacle and each having an arc angle. The circular arc sections of the two petals form two symmetric, alternately disposed arrangements in the receptacle. The circular arc sections define a flue. As such, the insertion forms a flue baffle device.

Abstract: A structure of the heat exchange pipe is provided for conducting heat generated by combustion inside a burner to the outside. The structure of the heat exchange pipe includes a receptacle and an insertion. The insertion is disposed in the receptacle. The insertion includes at least three petals, each of which includes a first circular arc section and a second circular arc section. The first circular arc section extends toward a center of the receptacle and has a first arc angle. The second circular arc section has a second arc angle. The second arc section is arranged between two first circular arc sections of two adjacent ones of the petals. The first and second circular arc sections define a flue. As such, the insertion forms a flue baffle device.