Multi-stage sealing pipeline compensation sealing device

The utility model relates to the technical field of pipeline sealing, and provides a multi-stage sealing pipeline compensation sealing device which comprises a fixed core pipe. One end of the outer sleeve is connected with the fixed core tube; one end of the guide pipe is connected with the fixed core pipe, the guide device is located in the outer sleeve, and a sliding space is formed between the outer sleeve and the guide pipe; one end of the movable core tube is slidably arranged in the sliding space; a limiting boss is arranged at one end, close to the outer sleeve, of the movable core tube; the limiting mechanism is arranged at the end, away from the fixed core pipe, of the outer sleeve and used for preventing the limiting boss from disengaging from the sliding space. By means of the technical scheme, the problems that in the prior art, a mechanical sealing device in a heat distribution pipeline is poor in sealing performance and prone to damage are solved. 本实用新型涉及管道密封技术领域，提出了一种多级密封的管道补偿密封装置，包括固定芯管；外套筒一端与