PIPE HAVING SPIRAL GUIDE PASSAGE

摘要

PROBLEM TO BE SOLVED: To easily manufacture a pipe of a desirable length without requiring complicated arrangement. SOLUTION: A short pipe 10 having a spiral guide passage is obtained by concentrically forming a spiral guide passage 12 of 1.5 pitches with hollow axial center inside a comparatively short pipe body 11. Plural short pipes 10 each having the spiral guide passage are concentrically arranged. Adjacent short pipe bodies are connected to each other, while adjacent spiral guide passages are connected to each other. A pipe 1 having spiral guide passages is thus formed.