Heat exchanger

Abstract

A heat exchanger includes a first honeycomb structure, a first cylindrical member, and a second honeycomb structure. The first honeycomb structure has an outer peripheral wall and partition walls that are disposed on an inner side of the outer peripheral wall and define a plurality of cells to form flow paths for a first fluid. The first outer cylinder is fitted into the outer peripheral wall of the first honeycomb structure. The second honeycomb structure has an outer peripheral wall, an inner peripheral wall, and partition walls that are disposed between the outer peripheral wall and the inner peripheral wall and that define a plurality of cells which serve as flow paths for the second fluid, and the inner peripheral wall is fitted into the first cylindrical member.

1 . A heat exchanger, comprising:
 a first honeycomb structure having an outer peripheral wall and partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells to form flow paths for a first fluid;   a first cylindrical member fitted into the outer peripheral wall of the first honeycomb structure; and   a second honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, the partition walls defining a plurality of cells to form flow paths for a second fluid, wherein the inner peripheral wall is fitted into the first cylindrical member.   
     
     
         2 . The heat exchanger according to  claim 1 , further comprising a heat conductive material disposed between the first honeycomb structure and the first cylindrical member and/or between the second honeycomb structure and the first cylindrical member. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein both end faces of the second honeycomb structure are located on inner sides of both end faces of the first honeycomb structure in an axial direction of the first honeycomb structure and the second honeycomb structure. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein both end portions of the first cylindrical member are located on outer sides of both end faces of the first honeycomb structure and the second honeycomb structure in an axial direction of the first honeycomb structure and the second honeycomb structure. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein, in a cross section orthogonal to an extending direction of the cells of the first honeycomb structure and the second honeycomb structure, the partition walls have first partition walls each extending in a circumferential direction and second partition walls each extending in a radial direction. 
     
     
         6 . The heat exchanger according to  claim 1 , wherein the second honeycomb structure is divided into multiple portions in a cross section orthogonal to an extending direction of the cells of the second honeycomb structure. 
     
     
         7 . The heat exchanger according to  claim 1 , wherein the first honeycomb structure and/or the second honeycomb structure contain ceramics as a main component. 
     
     
         8 . The heat exchanger according to  claim 7 , wherein the ceramics contains silicon carbide as a main component. 
     
     
         9 . The heat exchanger according to  claim 1 , wherein the first cylindrical member is made of a metal material. 
     
     
         10 . The heat exchanger according to  claim 1 , wherein at least one end portion of the first cylindrical member has a decreased or increased diameter. 
     
     
         11 . The heat exchanger according to  claim 1 , further comprising a second cylindrical member fitted into at least a part of the outer peripheral wall of the second honeycomb structure, wherein the second cylindrical member has an inflow port and a discharge port for the second fluid. 
     
     
         12 . The heat exchanger according to  claim 11 , further comprising a heat insulating material disposed between the second honeycomb structure and the second cylindrical member. 
     
     
         13 . The heat exchanger according to  claim 1 , wherein the flow direction of the first fluid and the flow direction of the second fluid are opposite to each other. 
     
     
         14 . The heat exchanger according to  claim 1 , wherein the first honeycomb structure further comprises an inner peripheral wall that forms a hollow region therein, the hollow region serving as a flow path for a third fluid. 
     
     
         15 . The heat exchanger according to  claim 14 , further comprising a third cylindrical member fitted into at least a part of the inner peripheral wall of the first honeycomb structure, wherein the third cylindrical member has an inflow port and a discharge port for the third fluid.