| 摘要 |
PROBLEM TO BE SOLVED: To improve heat exchange efficiency by disposing a wire rod along a clearance gap formed between a first heat transfer tube and a second heat transfer tube, and making the shape of a formed fillet compact.SOLUTION: This twisted tube type heat exchanger includes an approximately-cylindrical first heat transfer tube 1 in which a first fluid flows and which has a spiral groove composed of a peak section and a groove section on its outer periphery, an approximately-cylindrical second heat transfer tube 2 in which a second fluid flows, and which is wound along the groove section formed on the outer periphery of the first heat transfer tube 1, and the wire rod 4 mounted within the range surrounded by a tangent line 7 on the peak section 1c and an outer periphery of the second heat transfer tube 2, the outer periphery of the second heat transfer tube 2 and the peak section 1c in a cross-sectional view of a face passing through a central axis of the first heat transfer tube 1 in a state of pressing the second heat transfer tube 2 to the first heat transfer tube 1, and the fillet 5 is formed on part surrounded by the tangent line 7, the outer periphery of the second heat transfer tube 2 and the peak section 1c. |
