Reinforcement structure of heat exchanger

Abstract

To prevent a crack in a joint part of flattened tubes and a header, and smoothly distribute a fluid into the flattened tubes. In the joint part to the header, a reinforcement member having a curved reinforcement portion of U-shape is integrally brazed and fixed to outer peripheries of curved surfaces of the flattened tubes.

1 . A reinforcement structure of a heat exchanger, comprising a large number of flattened tubes each including a pair of parallel flat surfaces and curved surfaces connecting between both ends of the flat surfaces, wherein the flattened tubes are disposed side by side so that the flat surfaces thereof are parallel to each other, a multiplicity of fins are fixed to outer surfaces of the flattened tubes so as to form a core, in a state that both ends of the flattened tubes are inserted into tube insertion holes of a header, the inserted parts are integrally brazed, and wherein
 in at least part of the flattened tubes, on the outer surface side of said inserted parts, on outer peripheries of said curved surfaces in a joint part to the header, a reinforcement member having a curved reinforcement portion of U-groove shape to be matched with the outer peripheries is integrally brazed and fixed.   
     
     
         2 . The reinforcement structure of a heat exchanger according to  claim 1 , wherein
 in said reinforcement member, said plurality of curved reinforcement portions is integrally formed via a coupling portion, and the curved reinforcement portions are brazed to the adjacent flattened tubes.   
     
     
         3 . The reinforcement structure of a heat exchanger according to  claim 2 , wherein
 said coupling portion is brazed and fixed to an outer surface of the header.   
     
     
         4 . The reinforcement structure of a heat exchanger according to  claim 3 , wherein
 an inspection hole for seeing a brazing state is provided to project from part of said coupling portion.   
     
     
         5 . The reinforcement structure of a heat exchanger according to  claim 1 , wherein
 an inspection hole for seeing a brazing state is provided to project from part of the curved reinforcement portion.   
     
     
         6 . The reinforcement structure of a heat exchanger according to  claim 1 , wherein
 the reinforcement members are respectively provided in said joint parts of the flattened tubes at four corners of a plane of said core.   
     
     
         7 . The reinforcement structure of a heat exchanger according to  claim 1 , wherein space portions in which said fins do not exist are provided at the both ends of said flattened tubes, and the curved reinforcement portions of the reinforcement members are provided in the space portions.