HEAT EXCHANGER FOR A HEATING APPLIANCE

摘要

The invention relates to a heat exchanger for a heating appliance, especially a condensing heating appliance, consisting of at least two vertically oriented members (1, 1', 2) and one respective cover (3, 3') on the front side which form a combustion chamber (4) and laterally define at least one fuel gas flue (5) leading downstream from the combustion chamber (4) in the upper region to an exhaust gas collector in the lower region, said flue (5) comprising heat exchanger surfaces provided with surface-enlarging elements on the fuel gas side, especially in the form of ribs (6). Said heat exchanger optionally comprises at least one central member (2) between the two delimiting outer members (1, 1'), and a plurality of channels (7) in the members (1, 1', 2) and/or the covers (3, 3'), said channels (7) conducting a heating medium in parallel and/or in rows. The aim of the invention is to form a compact and light-weight heat exchanger especially suitable for a condensing operation of a heating appliance. The invention is characterized in that members (1, 1', 2) and covers (3, 3') are interconnected on the front side to form a block which is impermeable to fuel gas, while the channels (7) within the block which conduct the heating medium correspond to each other. The heat exchanger surfaces that pertain to two adjacent elements (1, 1', 2) and receive the fuel gas are at a larger distance from each other in the center in the longitudinal direction and thereby form a wider fuel gas flue (5) than in the edge regions, the ribs (6) being higher in the center and overlapping each other over a larger surface than in the edge regions.