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1. 发明专利

JPH0719379A CONNECTION STRUCTURE OF PIPE JOINT AND RESIN PIPE 失效
公开(公告)号：JPH0719379A
公开(公告)日：1995-01-20
申请号：JP16165093
申请日：1993-06-30
申请人： OSAKA GAS CO LTD , NIPPON KOKAN PIPE FITTING MFG
发明人： ISHIKAWA TETSUO , TANAKA TAKAHIRO , HIRABAYASHI HIDEO , NODA SHOZABURO
IPC分类号： F16L21/08
摘要： PURPOSE:To increase connection strength between a resin pipe and a pipe joint in a structure where a resin pipe provided with a tubular stiffener at the end part is inserted in a receiving port and whose bite teeth of a receiving port inner surface are caught in the resin tube, by improving the shape and dimension of the stiffener. CONSTITUTION:In a pipe joint 1, an anti-corrosion layer 3 is formed at the outer peripheral part of the receiving port, and rind-shaped bite teeth 3 are formed in the inner surface of the receiving port, 2 at plural positions in an axial direction at, prescribed intervals. A tubular stiffener 60 which uses ductile material such as steel pipe on the end part is fitted onto a heat insulation tube 50. After the end part where the stiffener 60 is fitted is inserted in the receiving port 2, a diameter widening device is moved inside the stiffener in an axial direction to widen the diameter of the end part, of a resin pipe 5, and make the bite teeth 3 caught in the external wall. With this constitution, the dimension of the stiffener 60 is set so that its end part, 61 may be protruded from the outmost end bite teeth 3A by H in a pull-out direction X, thus it is possible to widen the whole length uniformly.

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