Importance

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Abstract

The present invention relates to a heat exchanger (1′), comprising: —a gas-tight casing (2), —at least one tube (4) made from a good thermally conducting material and inside which a fluid to be heated can circulate, this tube (4) being helically wound so as to form a helical winding (40) having a longitudinal axis (X-X′) which is arranged inside said casing (2), —means for conveying and/or for producing hot gases inside said casing (2), such as a burner (3), so as to define a combustion chamber (26) therein, this helical winding (40) being arranged so as to form a gap (45) between two adjacent turns, said at least one tube (4) having a front face (41) and a rear face (42) which are opposing, a bottom side (43) oriented towards the longitudinal axis (X-X′) and a top side (44) oriented towards the casing (2), said front face (41) and said rear face (42) of the tube (4) being planar or substantially planar and being located on either side of the gap (45). This heat exchanger is noteworthy in that said at least one tube (4) has, on the front face (41) thereof and/or the rear face (42) thereof, a shoulder (46) which extends from the bottom side (43) of the tube towards the top side (44) thereof, over part of the height (H1) of the straight section of this tube (4) and also over the whole, or virtually the whole, length of this tube (4).

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First Claim