Heat exchanger

Abstract

A heat exchanger includes a plurality of heat exchange tubes stacked with a gap through which a first fluid can pass. The heat exchange tube includes: an internal flow path through which a second fluid for exchanging heat with the first fluid and which includes a folded portion; a plurality of slits provided between two flow path portions in the internal flow paths, the two flow path portions each extending from the folded portion and facing each other at an interval; and a plurality of protruding support portions in contact with another adjacent heat exchange tube to form the gap. As viewed in a stacking direction of the plurality of heat exchange tubes, at least one of the plurality of slits extends in a state where a center in an extending direction thereof deviates from a straight line connecting the two adjacent protruding support portions.

What is claimed is: 
     
         1 . A heat exchanger comprising a plurality of heat exchange tubes stacked with a gap through which a first fluid is passable,
 each of the heat exchange tubes including:   an internal flow path through which a second fluid for exchanging heat with the first fluid flows, the internal flow path including a folded portion;   an inflow-side connection portion which communicates with the internal flow path and into which the second fluid flows;   an outflow-side connection portion which communicates with the internal flow path and from which the second fluid flows out;   a plurality of slits provided in a portion of the heat exchange tube between two flow path portions in the internal flow paths, the two flow path portions respectively extending from the folded portions and facing each other at an interval; and   a plurality of protruding support portions in contact with another adjacent heat exchange tube to form the gap,   wherein as viewed in a stacking direction of the plurality of heat exchange tubes, at least one of the plurality of slits extends in a state where a center in an extending direction of the plurality of slits deviates from a straight line connecting the two adjacent protruding support portions.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein as viewed in the stacking direction, at least one of the plurality of slits extends without intersecting a straight line connecting the two adjacent protruding support portions. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein as viewed in the stacking direction, the plurality of slits extends avoiding a centerline of the heat exchange tube which passes between the inflow-side connection portion and the outflow-side connection portion. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein as viewed in the stacking direction, the plurality of slits are provided in the heat exchange tube symmetrically with respect to a center line. 
     
     
         5 . The heat exchanger according to  claim 1 ,
 wherein the heat exchange tube includes a cut-and-raised portion, and   wherein each of the slits is a through hole in the cut-and-raised portion.   
     
     
         6 . The heat exchanger according to  claim 5 , wherein a cut-and-raised piece in the cut-and-raised portion has a wall shape rising on a downstream side in a flow direction of the first fluid with respect to the through hole and inclined toward an upstream side in the flow direction. 
     
     
         7 . The heat exchanger according to  claim 5 , wherein a cut-and-raised piece in the cut-and-raised portion has a bridge shape extending in a direction orthogonal to a flow direction of the first fluid. 
     
     
         8 . The heat exchanger according to  claim 1 ,
 wherein the inflow-side connection portion and the outflow-side connection portion are adjacent to each other, and   wherein as viewed in the stacking direction, a through hole is provided in a portion of the heat exchange tube between the inflow-side connection portion and the outflow-side connection portion.   
     
     
         9 . The heat exchanger according to  claim 1 , wherein the inflow-side connection portion and the outflow-side connection portion are side by side in a flow direction of the first fluid. 
     
     
         10 . The heat exchanger according to  claim 9 , wherein the inflow-side connection portion is positioned on a downstream side in a flow direction of the first fluid, and the outflow-side connection portion is positioned on an upstream side.