| 摘要 |
<p>PURPOSE:To facilitate the connection of cheap resin duplex tubes with each other with the use of flange members by forming a bead sump chamber in each of the outer cylinder insertion part of an inner cylinder and the joint surface of an outer cylinder, and forming, on each of opposite side surfaces of a gasket, an annular bead having a shape complementary to that of an annular groove formed in one end face of a flange. CONSTITUTION:An annular groove 3a is formed on a joint end face of a flange part 3 made of a material the same as that of an outer cylinder 2, and the end part of an extension of an inner cylinder 1 is folded back and is fixed in the inner surface of the annular groove 3a by a fastening ring 4. The annular gasket 4 is made of a material the same as that of the inner cylinder 1, an annular bead 5a is integrally incorporated with each of opposite side surfaces of the gasket 5 and is fitted in the annular groove 3a, having a shape complementary with that of the latter, so as to reinforce the fixing strength of the folded-back part of the end part of the inner cylinder by pressing the fastening ring 4. Meanwhile, the centering for both of then is facilitated upon joint of the flange part 3. When the flange part 3 is fitted to a duplex tube N, the outer peripheral surface of the outer cylinder is fixed to the inner peripheral surface of the outer cylinder insertion part 7 by thermally fusing, welding or the like. A bead B formed at this time is stored in a bead sump 6.</p> |
