Heat exchanger

Abstract

A heat exchanger includes a first member and a second member. The first member is provided with a main body and a heat transfer accelerating portion formed on the main body as one unit. The second member is formed with a recess dented from a reference surface and functioning as a flow channel. The first member and the second member are joined with each other at the reference surface in a state where a part, which deviates from the recess when the first and second members are joined, of the heat transfer accelerating portion of the first member is cut off and the rest of the heat transfer accelerating portion is inserted into the recess of the second member.

1 . A heat exchanger comprising:
 a first member which is provided with a main body and a heat transfer accelerating portion formed on the main body as one unit; and   a second member which is formed with a recess dented from a reference surface and functioning as a flow channel, wherein   the first member and the second member are joined with each other at the reference surface in a state where a part, which deviates from the recess when the first and second members are joined, of the heat transfer accelerating portion of the first member is cut off and the rest of the heat transfer accelerating portion is inserted into the recess of the second member.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the flow channel has at least two straight line portions parallel to each other and at least one turn portion which fluidically communicates end portions of the straight line portions, and wherein   a portion, corresponding to the turn portion, of the heat transfer accelerating portion is cut off.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 the flow channel has a plurality of straight line portions parallel to each other and at least one turn portion which fluidically communicates end portions of the straight line portions, and wherein a flow depth (H), of the turn portion, form the reference surface is set to be larger than a height (h), of the heat transfer accelerating portion, from the heat-transfer-accelerating-portion side surface of the main body.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 the first member and the second member are joined with each other by using a friction stir welding method.   
     
     
         5 . The heat exchanger according to  claim 1 , wherein
 at least the second member is an aluminum casting.   
     
     
         6 . The heat exchanger according to  claim 1 , wherein
 a surface, opposite to the heat transfer accelerating portion, of the first member is one of a cooling surface and a warming surface.   
     
     
         7 . The heat exchanger according to  claim 1 , wherein
 the flow channel has a plurality of straight line portions parallel to each other and at least one turn portion which fluidically communicates end portions of the straight line portions, and wherein   the heat transfer accelerating portion has a plurality of projecting pieces, in the turn portion, which rise from the main body and allows a flowing medium to flow straight and turn directions thereof.   
     
     
         8 . The heat exchanger according to  claim 3 , wherein
 the turn portion has a projecting turn portion that projects in a direction opposite to the reference surface side and has an enlarged turn portion forming a part of the flow channel so that a cooling medium flowing through the straight line portion can turn toward the adjacent straight line portion and in the opposite direction.   
     
     
         9 . The heat exchanger according to  claim 8 , wherein
 the straight line portion and the enlarged turn portion are fluidically connected by a perpendicular step.   
     
     
         10 . The heat exchanger according to  claim 8 , wherein
 the enlarged turn portion has a slanted portion fluidically connected with the straight line portion.   
     
     
         11 . The heat exchanger according to  claim 10 , wherein
 the slanted portion is slanted along a direction perpendicular to the straight line portion.   
     
     
         12 . The heat exchanger according to  claim 10 , wherein
 the slanted portion is slanted along a direction of the straight line portion.   
     
     
         13 . The heat exchanger according to  claim 8 , wherein
 a corner, perpendicular to the straight line portion, of the turn portion is chamfered.   
     
     
         14 . The heat exchanger according to  claim 8 , wherein
 a part of the enlarged turn portion is partially overlapped with the heat transfer accelerating portion.   
     
     
         15 . The heat exchanger according to  claim 1 , wherein
 the heat transfer accelerating portion is a plurality of fin portions that extends straight and parallel to each other.   
     
     
         16 . The heat exchanger according to  claim 2 , wherein
 the turn portion is provided with a speed-distribution changing means that suppresses a peak speed of flow medium running through the flow channel to change speed distribution thereof so as to close to be a flat speed distribution after the flow medium passes through the speed-distribution changing means.   
     
     
         17 . The heat exchanger according to  claim 1 , wherein
 the heat transfer accelerating portion is formed by using an extrusion process method.   
     
     
         18 . A heat exchanger manufacturing method comprising the steps of:
 preparing blocks to be a first member and a second member;   forming a heat transfer accelerating portion on a main body of the first member as one unit so that the heat transfer accelerating portion projected from the main body;   forming a recess in the second member so that the recess is dented from a reference surface of the second member and forms a part of a flow channel;   cutting off a portion, deviating from the flow channel when the first and second members are joined, of the heat transfer accelerating portion; and   joining the first member and the second member with each other at the reference surface of the second member.   
     
     
         19 . The heat exchanger manufacturing method according to  claim 18 , wherein
 the heat transfer accelerating portion is formed on the main body by using an extrusion process method.   
     
     
         20 . The heat exchanger manufacturing method according to  claim 18 , wherein
 the flow channel has a plurality of straight line portions parallel to each other and at least one turn portion which fluidically communicates end portions of the straight line portions, and wherein   the heat transfer accelerating portion is fin portions that extends straight over the straight line portion and parallel to each other.