| 摘要 |
A pipe joint structure is provided to prevent the fluid getting vent through a welded part and to improve the water-tightness between an end part of a joint part and a second pipe. A pipe joint structure comprises: a joint part(3) in which the diameter of a first pipe(1) end part is expanded; and a packing ring(4) of elastic material formed in order to maintain the water-tightly between the end part of a second pipe(2) and the joint part. The joint part has the cross section of trapezoidal shape to be adhered closely to the outside. The packing ring is consisting of: a plurality of first compression projections(5,5') protruding at both sides of outer circumference; a first pressure distribution groove(6) formed in the in-between of outer circumference; a plurality of second compression projections(7,7') protruding in both sides of inner circumference; and a second pressure distribution groove(9) formed in the in-between of inner circumference. The second pressure distribution groove is connected with the second pressure distribution groove through a through-hole(8).
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