Boiler sleeve anti-cracking structure

The utility model discloses an anti-cracking structure of a boiler sleeve, which is characterized in that a new sleeve is arranged outside an original sleeve, the new sleeve is connected with the original sleeve through threads, the threads of the new sleeve are distributed on the surface of the inner diameter, and the threads of the original sleeve are distributed on the surface of the outer diameter. Good sealing is ensured; the expansion is relatively free, the safety of a weld joint is ensured, the weld joint between the sleeve and the main pipe is protected, the boiler pipe is prevented from being torn, the boiler can keep stable and long-period operation, the sealing effect is ensured through gradual sealing of a plurality of screw pitches, and smoke in a hearth of the boiler cannotleak to the position above a ceiling superheater. 本实用新型公开了一种锅炉套管防裂结构，在原套管外部安装新套管，新套管和原套管之间通过螺纹连接，新套管的螺纹分布在内径表面，原套管的螺纹分布在外径表面。保证良好密封的情况下，使膨胀相对自由，保证焊缝安全，保护了套管与母管之间的焊缝，确保了锅炉管不发生撕裂，锅炉能保持稳定长周期运行，通过多个螺距的逐渐密封，从而确保了密封效果，使锅炉炉膛里面的烟气不会泄