Heat exchanger

Abstract

A heat exchanger comprises outer fins; a plurality of tubes arranged alternately with the outer fins; and header tanks receiving open ends of the tubes for communication with the tubes. The header tanks each comprise a first member and a second member which are combined to each other. The first member has tube insertion slots into which the open ends of the tubes are inserted, the second member does not have the tube insertion slots. The first member is either a core material having no brazing material layers on outer and inner peripheral surfaces thereof, or a core material having a brazing material layer on an outer peripheral surface thereof but having no brazing material layer on an inner peripheral surface thereof. The second member is brazed to the outer or inner peripheral surface of the first member having no brazing material layer thereon.

1 . A heat exchanger comprising:
 outer fins;   a plurality of tubes having open ends and arranged alternately with the outer fins; and   header tanks receiving the open ends of the tubes for communication with the tubes, the header tanks each comprising a first member and a second member which are combined to each other;   wherein the first member includes tube insertion slots into which the open ends of the tubes are inserted, the second member lacking the tube insertion slots;   the first member is either a core material having no brazing material layers on outer and inner peripheral surfaces thereof, or a core material having a brazing material layer on an outer peripheral surface thereof which does not have brazing material layer on an inner peripheral surface thereof; and   the second member is brazed to the outer or inner peripheral surface of the first member which does not have brazing material layer thereon;   wherein the first member does not have the brazing material layer on the inner peripheral surface thereof and has a brazing material layer on the outer peripheral surface thereof; and   the second member is connected to an inner peripheral surface of the first member and brazed to the first member;   wherein an edge of the first member is spaced from the outer peripheral surface of the second member.   
   
   
       2 . A heat exchanger as set forth in  claim 1 , wherein the first member and the second member of the header tank each have a box-like shape with an opening formed in a combining direction to each other. 
   
   
       3 . A heat exchanger as set forth in  claim 2 , wherein the second member has the brazing material layer thereon. 
   
   
       4 . A heat exchanger as set forth in  claim 1 , wherein:
 the header tank includes a pipe comprising the first member and the second member, and lids for closing opposite open ends of the pipe; and   the lids are connected in the pipe.   
   
   
       5 . A heat exchanger as set forth in  claim 4 , wherein the second member includes the brazing material layer thereon. 
   
   
       6 . A heat exchanger as set forth in  claim 4 , wherein the lids each have a plate-like shape, and have a brazing material layer on at least one surface thereof. 
   
   
       7 . A heat exchanger as set forth in  claim 1 , further comprising a partition fitted in each header tank for partitioning an interior space of the header tank into a plurality of chambers, the partition being connected to the inner peripheral surfaces of the first and second members. 
   
   
       8 . A heat exchanger as set forth in  claim 7 , wherein the partition has a plate-like shape, and the brazing material layer on at least one surface thereof.