| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce damage of breakage to the minimum in case of abnormal rise of internal pressure by setting the strength of easily repairable device or part lower than that of a device or a part hard to be repaired among the devices and parts for constructing a coolant circuit. SOLUTION: Among devices or parts for constructing a coolant circuit, in case of breakage of the main body 21 of a branch pipe 4 by rise of internal pressure, a broken part 23 is located in a position of a boundary between a brazing filler material 22 and a base material of copper so that the length of a crack is short, an opening is small, causing gradual gas leakage. The broken part can be easily repaired by overlaying the brazing filler material. Accordingly, the strength of the branch pipe 4 is set lower than those of the other parts for constructing the coolant circuit. Thus, the branch pipe 4 functions as a protection for the parts which are not to be prevented from breakage because of difficulty of repairing.</p> |
