Seal structure for heat exchanger and heat exchanger

A seal structure of a heat exchanger, the seal structure comprising a seal plate mounted on a baffle plate disposed in a shell included in the heat exchanger, the seal plate being in contact with a wall surface on an inner surface side of the shell,

• wherein the seal plate is composed of a plurality of thin plates which are laminated, the thin plates are curved by elastic deformation, and the plurality of thin plates includes a contact thin plate located on an outermost side of the curve, the contact thin plate being the only thin plate which is in contact with the wall surface,
• wherein the contact thin plate has an outer surface and an inner surface on opposite sides of the contact thin plate with respect to a thickness direction of the contact thin plate, wherein the outer surface is a surface on an outside of the curve, the inner surface is a surface on an inside of the curve, and the outer surface is in contact with the wall surface, and
• wherein a longitudinal end of the contact thin plate is configured to not come in contact with the wall surface, and
• wherein the contact thin plate further comprises a folded part in which a portion of the contact thin plate including the longitudinal end of the contact thin plate is folded back toward the inner surface of a non-folded part of the contact thin plate such that the outer surface of the portion of the contact thin plate forming the folded part directly contacts a thin plate of the plurality of thin plates which is immediately adjacent to the contact thin plate.