Interlocking type connecting joint and application thereof

The utility model relates to the technical field of gas pipelines, in particular to an interlocking type connecting joint, which is characterized in that the lower end of the outer wall of the lower wall of a clamping ring is connected with a convex part extending outwards, an annular notch is formed between the convex part and a conical surface, and the upper end of the inner wall of a lower joint is an inclined surface part matched and extruded with the conical surface; and an annular clamping groove for embedding and locking the convex part to prevent the lower joint from falling off is formed in the inner wall of the lower joint below the inclined surface part. During use, a stainless steel corrugated pipe with a Green joint is inserted into the clamping ring along a lower opening of the lower joint and abuts against the lower portion of the sealing gasket, sealing is formed, the upper joint is screwed downwards, the inclined face portion of the lower joint extrudes the conical face, the clamping ring shr