| 摘要 |
PROBLEM TO BE SOLVED: To improve the joining strength of a joint between two cylinder bodies of one being an inner cylinder body and the other being an outer cylinder body and a flange. SOLUTION: The tip part of an outer cylinder 11 forms a bent part 11a1 bent orthogonally to a straight pipe part 11a2 and a boundary part 11a3 between the bent part 11a1 and the straight pipe part 11a2 is formed in an acuate state. With the outer cylinder fitted in the outer periphery of the inner cylinder, the inner peripheral surface of the straight pipe part 11a2 is brought into contact with the outer peripheral surface of the inner cylinder. The upper surface of the bent part 11a1 is brought into contact with one surface 15a of an outward flange 15 and brazing is applied on all the portion between the contact portions of the two parts for joining together the two contact portions. The area of a contact portion between an outer cylinder 11 and the outward flange 15 is increased, and a whole portion extending from the contact portion to the inner cylinder 12 is brought into a brazed joining state, and the joining strength of a joint part is extremely increased.
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