Heat exchanger

A heat exchanger comprising:

• a plurality of heat exchange parts in which a heating medium channel (P1), through which a heating medium flows, and a combustion gas channel (P2), through which a combustion gas combusted in a burner flows, are alternately formed adjacent to each other in a space between a plurality of plates,
• wherein each of the heat exchange parts is configured to surround a space of a combustion chamber (C) provided at a central portion of each heat exchange part, and the plurality of heat exchange parts are stacked together to form a stacked structure,
• wherein:
• a heating medium inlet and a heating medium outlet are respectively formed on two opposite sides of an upper portion of each of the plurality of heat exchange parts,
• a blocking wall is provided between the heating medium inlet and the heating medium outlet disposed adjacent to each other in each of the plurality of heat exchange parts,
• the plurality of heat exchange parts include three adjacently stacked heat exchange parts, namely, a first heat exchange part, a second heat exchange part, and a third heat exchange part, which are arranged such that a heating medium outlet formed on the first heat exchange part faces a heating medium inlet formed on a second heat exchange part, and a heating medium outlet formed on the second heat exchange part faces a heating medium inlet of the third heat exchange part,
• the plurality of plates constituting each of the heat exchange parts are provided to be upright along a longitudinal direction and are stacked in a front-rear direction,
• the combustion gas generated by the combustion of the burner is discharged through a lower portion of each of the heat exchange parts,
• the heating medium channels (P1) in the plurality of heat exchange parts are configured to allow the heating medium to flow in only one direction, and
• a plurality of flanges each of which is formed to be bent at an edge of each of the plurality of plates, and a combustion gas pass-through unit (D) through which the combustion gas flowing in the combustion gas flow channel passes is formed at a part of an area of the edge of the plurality of plates in a state in which flanges of adjacent plates overlap, so that the combustion gas is distributed and discharged at a uniform flow rate through the combustion gas pass-through unit (D).