Condensation heat exchanger

Abstract

The present invention relates to a condensation heat exchanger () comprising: —at least one tube () in the form of a helical winding (), having a planar front face () and a planar rear face () and being housed in a casing (), —means () for producing a hot gas inside said casing, —a discoid deflector () which is provided with a peripheral flange () and is arranged in the helical winding (), such that the flange thereof is inserted in a gap between two successive turns, and a combustion chamber () and a condensation chamber () are to be provided in the casing (). This exchanger is noteworthy in that the front face () of said flange () is gas-tightly attached to the rear face () of the final turn () of said winding () which is located in the combustion chamber (), in that at least one protruding element () is arranged between the rear face () of said flange () and the front face () of the first turn () which is located in the condensation chamber (), so as to provide therebetween a gap for circulation of the gases ('), and in that the external diameter of the discoid deflector (D) is less than the internal diameter (D) of the helical winding () so as to provide a passage for circulation of the hot gases ().