| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a double pipe easy to manufacture for preventing the generation of chattering noises by putting an outer pipe in strong contact with an inner pipe, independently of bending curvature. <P>SOLUTION: The double pipe comprises the outer pipe 1 for first fluid to flow and the inner pipe 2 arranged therein for second fluid to flow. The inner pipe 2 in an elliptical cross section with a protruded portion 2A protruded outward in the radial direction is prepared and twisted around the center into a twisted shape. The inner pipe 2 in the twisted shape is inserted into the outer pipe 1, and the outer pipe 1 is machined to reduce its diameter in such a state and put in pressure contact with the protruded portion 2A of the inner pipe. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
