Axial compensation device for heat distribution pipeline

The invention provides a heat distribution pipeline axial compensation device which comprises an inner working pipe, an outer protection pipe and a steam sealing device, the inner working pipe is sleeved with the first end of the outer protection pipe, sealing filler is arranged between the inner wall of the first end of the outer protection pipe and the outer wall of the inner working pipe, and the steam sealing device is located in the outer protection pipe and spaced from the sealing filler. The steam sealing device comprises a plurality of steam sealing rings arranged at intervals in the length direction of the outer protective pipe, the outer walls of the steam sealing rings are fixedly connected with the inner wall of the outer protective pipe, a circle of tooth blocks are evenly distributed on the inner walls of the steam sealing rings, the tooth blocks on every two adjacent steam sealing rings are arranged in a staggered mode, and gaps are reserved between the ends, away from the steam sealing rings,