Heat exchanger

A heat exchanger configured to cause heat exchange between a target of heat exchange and a heating medium, the heat exchanger comprising:

• a flow path tube having a flat cross sectional shape in a first cross section, which is perpendicular to one direction, and configured to cause the heating medium to flow therethrough, wherein an upstream side of a flow of the heating medium is one side in the one direction, wherein a downstream side of the flow of the heating medium is an other side in the one direction;
• and
• an inner fin
• placed in the flow path tube to divide an internal space of the flow path tube into a plurality of fine flow paths arranged in a longitudinal direction of the flat cross sectional shape,
• having, in the first cross section, a corrugated cross sectional shape in which a one-side protruded form, which is bulged to one side in a thickness direction of the flat cross sectional shape, and an other-side protruded form, which is bulged to an other side in the thickness direction, are alternately arranged and extended in the longitudinal direction, and
• extended in the one direction, wherein
• in a second cross section perpendicular to the thickness direction, the inner fin has a meander shape in which a one-side top part, which is placed between the fine flow paths and bent to bulge to one side in the longitudinal direction, and an other-side top part, which is placed between the fine flow paths and bent to bulge to an other side in the longitudinal direction, are alternately arranged in the one direction via an intermediate part therebetween,
• the intermediate part includes
• a communication part having a communication port via which two of the fine flow paths, which are adjacent to each other via the inner fin, communicate with each other,
• one-side wall part extended from the one-side top part, which is adjacent to the communication part in the one direction, to the communication part and separating the two of the fine flow paths from each other, and
• an other-side wall part extended from the other-side top part, which is adjacent to the communication part in the one direction, to the communication part and separating the two of the fine flow paths from each other,
• the inner fin includes the communication part that is one or more,
• the communication port is placed in the intermediate part and away from the one-side top part and the other-side top part,
• a periphery of the communication port includes an edge of the one-side wall part and an edge of the other-side wall part, and
• the edge of the one-side wall part is formed such that, in the first cross section, the edge of the other-side wall part is shifted in parallel in the longitudinal direction.