Plate-type heat exchanger

Abstract

A plate-type heat exchanger formed by stacking a plurality of heat exchange units on top of each other, wherein adjacent heat exchange units are stacked such that the internal space in one heat exchange unit and the internal space in another heat exchange unit communicate with each other through a first opening in the one heat exchange unit and a second opening in the other heat exchange unit, the one heat exchange unit includes an insertion wall disposed on a peripheral edge of the first opening and inserted in the second opening when the adjacent heat exchange units are stacked, and the insertion wall has a distal end with a circumferentially discontinuous protrusion height.

1 . A plate-type heat exchanger comprising:
 a plurality of heat exchange units stacked on top of each other,   wherein each of the plurality of heat exchange units is configured to exchange heat between first fluid flowing through an internal space in the heat exchange unit and second fluid flowing outside the heat exchange unit,   adjacent heat exchange units of the plurality of heat exchange units are stacked such that the internal space in one heat exchange unit of the adjacent heat exchange units and the internal space in another heat exchange unit of the adjacent heat exchange units communicate with each other through a first opening in the one heat exchange unit and a second opening in the other heat exchange unit,   the one heat exchange unit of the adjacent heat exchange units includes an insertion wall disposed on a peripheral edge of the first opening and inserted in the second opening when the adjacent heat exchange units are stacked, and   the insertion wall has a distal end with a circumferentially discontinuous protrusion height.   
     
     
         2 . The plate-type heat exchanger according to  claim 1 ,
 wherein each of the plurality of heat exchange units includes a set of a first heat exchange plate and a second heat exchange plate joined together,   of the set of the first and second heat exchange plates of each heat exchange unit, at least the first heat exchange plate has on its peripheral edge an outer peripheral flange portion disposed upright on one side in a stacking direction of the heat exchange units,   with regard to the adjacent heat exchange units, the first heat exchange plate of the one heat exchange unit and a proximate heat exchange plate corresponding to one of the set of the first and second heat exchange plates of the other heat exchange unit adjacent to the one heat exchange unit on the one side in the stacking direction, the proximate heat exchange plate being located near the first heat exchange plate of the one heat exchange unit, are stacked such that the outer peripheral flange portion of the first heat exchange plate of the one heat exchange unit and a peripheral edge of the proximate heat exchange plate of the other heat exchange unit adjacent to the one heat exchange unit on the one side in the stacking direction overlap each other in the stacking direction by a predetermined overlapping margin, and   the distal end of the insertion wall has a maximum protrusion height larger than the overlapping margin.   
     
     
         3 . The plate-type heat exchanger according to  claim 1 ,
 wherein the distal end of the insertion wall is located radially inward of the first opening than a proximal end of the insertion wall is.   
     
     
         4 . The plate-type heat exchanger according to  claim 1 ,
 wherein when the adjacent heat exchange units are stacked on top of each other, the other heat exchange unit of the adjacent heat exchange units has, at a peripheral edge of the second opening, a recess recessed toward the first opening of the one heat exchange unit of the adjacent heat exchange units.