| 摘要 |
PURPOSE: A lead pipe for a boiler is provided to increase the heat efficiency by staying the gas of high temperature inside the lead pipe for a long time by curving the middle of the lead pipe. CONSTITUTION: A lead pipe for a boiler(5) comprises: a curved unit(11) formed a long pipe of copper material at a regular interval; the curved unit(11) form a left and a right side pressed units(8)(9) in concave by molding the left and the right sides of the copper pipe with a compressing device such as a press or a roller; forming a front pressed unit(6) and a rear pressed unit(7) by pressing the front or the rear faces with the compressing device such as the press or the roller; molding the front pressed unit(6) and the rear pressed unit(7) to be arranged in zigzag; a narrow passing slot(10) formed by facing a convex projected unit inside the pipe by pressing the convex projected unit and the front and the rear pressed units(6)(7) convex inside the pipe by pressing the left and the right side pressed units(8)(9).
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