Patent ID: 9448013
Filing Date: 2016-09-20
CPC Classification: F28D,F28F

Claim Text:
1. A plate heat exchanger in which a plurality of plates each having an inlet and an outlet for a fluid are stacked, and a passage through which the fluid having flowed therein from the inlet flows toward the outlet is provided between adjacent plates, wherein each of the plates has a wavy portion provided between the inlet and the outlet and waving in a plate stacking direction, the wavy portion having a plurality of top parts and a plurality of bottom parts provided alternately from a side on which the inlet is provided toward a side on which the outlet is provided, wherein the wavy portions of the respective plates each have a V shape in the stacking direction, the V shapes are substantially evenly distributed in the wavy portions, wherein the adjacent plates are bonded to each other at regions thereof where the top parts of the V-shaped wavy portion provided in a lower one of the plates that is on a lower side in the stacking direction and the bottom parts of the V-shaped wavy portion provided in an upper one of the plates that is on an upper side overlap each other, wherein at least one of the top parts of the V-shaped wavy portion of the lower plate is an adjacent top part, and at least another one of the top parts of the V-shaped wavy portion is a top part other than the adjacent top part, wherein the adjacent top part is adjacent to at least one of the inlet and the outlet, and the adjacent top part has a planar shape, wherein an upper surface of the top part other than the adjacent top part has a convex shape protruding toward the upper side, wherein the bottom parts of the wavy portion of the upper plate include at least one bonded bottom part and at least one bottom part other than the bonded bottom part, wherein the bonded bottom part of the upper plate is bonded to the adjacent top part of the lower plate, and the bonded bottom part has a planar shape, wherein a lower surface of the bottom part other than the bonded bottom part has a convex shape protruding toward the lower side, and wherein a bonded area where the adjacent top part and the bonded bottom part are bonded is larger than a bonded area where the top part other than the adjacent top part and the bottom part other than the bonded bottom part are bonded.