Heat Exchanger

Abstract

A heat exchanger includes a core and a header. At least one of first header portions or second header portions includes a guiding flow passage that has a plurality of flow passages which guide a fluid between a plurality of core end openings and a tank while changing a flow passage sectional shape.

1 . A heat exchanger comprising:
 a core that includes a plurality of first flow passages and a plurality of second flow passages and exchanges heat between fluids flowing in the first flow passages and the second flow passages respectively; and   a header that includes a first header portion, which is connected to an end surface of the core and covers core end openings of the plurality of first flow passages, and a second header portion, which covers core end openings of the plurality of second flow passages,   wherein the first header portion and the second header portion each include a port for causing the fluids to flow into or flow out from an inside thereof and a tank connected to the port, and   at least one of the first header portion or the second header portion includes a guiding flow passage that is connected to the plurality of core end openings of one of the first flow passages or the second flow passages and that has a plurality of flow passages which extend to a corresponding tank side and guide the fluids between the plurality of core end openings and the tank while changing a flow passage sectional shape orthogonal to a flow direction of the fluids.   
     
     
         2 . The heat exchanger according to  claim 1 ,
 wherein the plurality of core end openings each have a first flow passage width in a width direction orthogonal to a flow passage height direction, in a section orthogonal to the flow direction of the fluids,   the tank has a second flow passage width smaller than the first flow passage width in the width direction, in a boundary portion of the tank with the guiding flow passage, and   the flow passages each have the flow passage sectional shape which changes such that the closer to a core end opening side, the closer a flow passage width becomes to the first flow passage width, and the closer to the tank side, the closer the flow passage width becomes to the second flow passage width.   
     
     
         3 . The heat exchanger according to  claim 1 ,
 wherein the plurality of core end openings each have a first flow passage height in a flow passage height direction, in a section orthogonal to the flow direction of the fluids,   the tank has a second flow passage height larger than the first flow passage height in the flow passage height direction, in a boundary portion of the tank with the guiding flow passage, and   the flow passages each have the flow passage sectional shape which changes such that the closer to the core end opening side, the closer a flow passage height becomes to the first flow passage height, and the closer to the tank side, the closer the flow passage height becomes to the second flow passage height.   
     
     
         4 . The heat exchanger according to  claim 1 ,
 wherein the flow passages each are formed such that a ratio between a flow passage width and a flow passage height of the flow passage sectional shape is changed while a flow passage sectional area is kept substantially constant in the flow direction of the fluids.   
     
     
         5 . The heat exchanger according to  claim 1 ,
 wherein the first header portion and the second header portion are integrally provided in the common header, and   the guiding flow passage includes a first guiding flow passage having the plurality of flow passages for guiding the fluids flowed into or flowed out from the plurality of first flow passages and a second guiding flow passage having the plurality of flow passages for guiding the fluids flowed into or flowed out from the plurality of second flow passages.   
     
     
         6 . The heat exchanger according to  claim 1 ,
 wherein the core end openings of the first flow passages and the core end openings of the second flow passages each include a plurality of entrance openings and a plurality of exit openings formed in the end surface of the core, and   the guiding flow passage provided in at least one of the first header portion covering the first flow passages or the second header portion covering the second flow passages includes an entrance guiding flow passage corresponding to the plurality of entrance openings and an exit guiding flow passage corresponding to the plurality of exit openings.   
     
     
         7 . The heat exchanger according to  claim 1 ,
 wherein the core has a stacked structure in which the plurality of first flow passages and the plurality of second flow passages are alternately stacked in a height direction via partition plates, and   an edge of the header is joined to an edge of the end surface of the core, and respective bulkheads of the plurality of flow passages of the header are joined to core end surface portions of the partition plates between the first flow passages and the second flow passages.   
     
     
         8 . The heat exchanger according to  claim 1 ,
 wherein the core has a rectangular parallelepiped shape, and the respective core end openings of the plurality of first flow passages and the plurality of second flow passages are vertically arranged in the end surface formed of any one of side surfaces of a rectangular parallelepiped, and   the header is joined to the end surface so as to integrally include the first header portion and the second header portion and to collectively cover the respective core end openings of the plurality of first flow passages and the plurality of second flow passages.