A heat exchanger comprising a heat exchange module, a housing that houses the heat exchange module, and sealing members, wherein
- the heat exchange module includes a plurality of pipes through which a first fluid flows, and fixing members, wherein the plurality of pipes are arrayed in parallel with one another in a two-dimensional form and stacked in plural layers, and the fixing members are present in interstices around the pipes to hold the array of the plurality of pipes, and four pieces of the fixing members are arranged along a central axis direction of the pipes with spaces therebetween, with first and second outer-side fixing members being positioned closely to first and second ends of the tube, respectively,
- on respective outer peripheral portions of the fixing members, flow path forming members comprising walls are mounted so that the walls protrude toward outside of the heat exchange module and oppose to each other, each of the walls having a through hole going through in a thickness direction of the wall and a pressing member through a center of which the through hole pierces,
- a first flow path member is disposed between the pressing members of the wall provided on the first outer-side fixing member and the wall provided on a first inner-side fixing member adjacent to the first outer-side fixing member, so as to communicate with the through holes of the walls, the first flow path member being pressed by the pressing members,
- a second flow path member is disposed between the pressing members of the wall provided on the second outer-side fixing member and the wall provided on a second inner-side fixing member adjacent to the second outer-side fixing member, so as to communicate between the through holes of the walls, the second flow path member being pressed by the pressing members,
- wherein the first and second flow path members are not extended to an inside area between the first and second inner-side fixing members, thereby being open to the inside area between the first and second inner-side fixing members, while being closed to the area between the adjacent outer-side and inner-side fixing members,
- the housing has a pair of openings that expose ends of the pipes on both sides, an inlet for introducing a second fluid flowing over surfaces of the plurality of pipes into the housing, and an outlet disposed so as to be opposed to the inlet, the outlet being for discharging the second fluid, wherein inner surfaces of the housing are brought into close contact with parts of the outer peripheral portions of the fixing members where the walls are not provided, and with the walls,
- the sealing members include a first sealing member, a second sealing member, and a third sealing member, wherein
- the first sealing member is formed with a resin material filled in interstices around the pipes positioned between one of the openings of the housing on one side and the outer-side fixing member positioned closely to ends of the pipes on said side,
- the second sealing member is formed with a resin material filled in interstices around the pipes positioned between the other one of the openings of the housing on the other side and the outer-side fixing member positioned closely to ends of the pipes on the other side,
- the third sealing member is formed with a resin material filled in interstices around the pipes present between the first and second inner-side fixing members, thereby leaving gaps between the first and third sealing members and between the second and third sealing members, and
- a flow path through which the second fluid introduced through the inlet is guided to the outlet is formed with the third sealing member between the first and second inner-side fixing members,
- wherein the first and second flow path members each establish a flow path to communicate an outside of the respective outer-side fixing member with the inside area between the inner-side fixing members in a state before the resin material is filled to form the first to third sealing members.