Heat exchanger

A heat exchanger comprising:

• a core unit having a plurality of tubes that allows fluid to circulate therethrough;
• and
• a pair of header tanks that is positioned at longitudinal end portions of the plurality of tubes, wherein the pair of header tanks extends in a direction orthogonal to a longitudinal direction of the tubes to be communicated with the plurality of tubes, wherein each of the pair of header tanks has a core plate, to which the tubes are bonded, and a tank main body, which together with the core plate defines a tank space, wherein:
• the tank main body has at least a first main body segment and a second main body segment;
• the header tank is provided with partitioning means that divides the header tank into a first space, which is an internal space of the first main body segment, and a second space, which is an internal space of the second main body segment, such that at least the first space and the second space are arranged in a longitudinal direction of the header tank, wherein the partitioning means has a first partitioning surface that faces the first space and has a second partitioning surface that faces the second space;
• a plurality of heat exchanger units is defined by dividing the core unit at the partitioning means in a direction, in which the first space and the second space are arranged;
• the core plate has a tube bonding surface, to which the tubes are bonded;
• the tube bonding surface has an annular outer peripheral seal surface formed therearound over an entire perimeter of the tube bonding surface, wherein a seal member, which seals between the core plate and an end portion of the tank main body adjacent the core plate, is provided in the annular outer peripheral seal surface;
• the tube bonding surface has a partitioning seal surface at a position, which corresponds to the partitioning means, wherein the seal member is provided at the partitioning seal surface to seal between the core plate and the partitioning means;
• the partitioning seal surface and the outer peripheral seal surface are coplanar;
• the seal member has a part, which is held by the core plate and the tank main body therebetween, and which has a uniform thickness;
• the seal member includes:
• an annular part that is annularly formed to seal between the outer peripheral seal surface of the core plate and the end portion of the tank main body adjacent the core plate;
• and
• a partitioning seal part that seals between the partitioning seal surface of the core plate and the partitioning means;
• the annular part is formed integrally with the partitioning seal part;
• and
• the partitioning seal part has:
• a first surface that faces the partitioning seal surface;
• a second surface that is opposite to the first surface and is adjacent to the partitioning means;
• and
• a recess that is recessed into a part of the first surface toward the second surface and defines a cavity between the partitioning seal surface and the partitioning seal part.