Heat exchanger

Abstract

A heat exchanger is disclosed. The heat exchanger includes a stacked body including multiple plates stacked to form a flow passage for a first fluid and a flow passage for a second fluid alternately in the stacking direction. A bottomed tubular and rectangular parallelepiped shaped case houses the stacked body and is open on one side in the stacking direction. A base plate is provided on an open side of the case. The case has an inflow port and an outflow port through which the first fluid passes in a flat surface part of a side wall part that extends in the stacking direction, and a stepped part formed around the inflow port or the outflow port.

What is claimed is: 
     
         1 . A heat exchanger, comprising:
 a stacked body including multiple plates stacked to form a flow passage for a first fluid and a flow passage for a second fluid alternately in the stacking direction;   a bottomed tubular and rectangular parallelepiped shaped case that houses the stacked body and is open on one side in the stacking direction;   a base plate provided on an open side of the case;   wherein the case has an inflow port and an outflow port through which the first fluid passes in a flat surface part of a side wall part that extends in the stacking direction, and a stepped part formed around the inflow port or the outflow port.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the stepped part has a level difference with a direction such that an inner side region thereof protrudes toward an outer side of the case more than an outer side region. 
     
     
         3 . The heat exchanger according to  claim 2 , wherein the side wall part has an enlarged part with enlarged internal dimensions and external dimensions, in an edge part on the open side of the case;
 wherein the inner side region and the enlarged part extend along a common plane.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein the case is formed in a rectangular shape when viewed from the stacking direction, and the inflow port and the outflow port are arranged at locations adjacent to each of a pair of diagonally opposed corner parts. 
     
     
         5 . The heat exchanger according to  claim 2 , wherein the case is formed in a rectangular shape when viewed from the stacking direction. 
     
     
         6 . The heat exchanger according to  claim 5 , wherein the inflow port and the outflow port are arranged at locations adjacent to each of a pair of diagonally opposed corner parts. 
     
     
         7 . The heat exchanger according to  claim 2 , wherein the side wall part has an enlarged part with enlarged internal dimensions and external dimensions, in an edge part on the open side of the case. 
     
     
         8 . The heat exchanger according to  claim 3 , wherein the case is formed in a rectangular shape when viewed from the stacking direction, and the inflow port and the outflow port are arranged at locations adjacent to each of a pair of diagonally opposed corner parts.