Connecting structure of heat supply flexible pipe and rigid pipe

The utility model discloses a connecting structure of a heat supply flexible pipe and a heat supply rigid pipe, and belongs to the technical field of heat supply pipeline connection. According to the structure, a welding ring is arranged at the end, connected with the double bellmouths, of a steel conversion piece, and the length of the exposed part of the welding ring is larger than that of the part inserted into the double bellmouths; the spigot end of the heat preservation nodular cast iron pipe is connected with the double bellmouths through a self-anchoring structure. A gap is reserved between the end part of the steel conversion piece in the double bellmouths and the end part of the warm nodular cast iron pipe; the length of the gap, the length of the steel conversion piece inserted in the double bellmouths and the length of the heat preservation nodular cast iron pipe connected in the double bellmouths in a self-anchored mode are equal; the connecting device effectively prevents the connecting position