The utility model discloses a heat transport machine is traded to spiral closed, including rotary drum, feeding case, go out that workbin, drive mechanism, medium advance tub, medium exit tube, the spiral heat exchange tube in being fixed in the rotary drum, it is associative that the pipe is advanced through rotary joint and medium to spiral heat exchange tube's one end, it is associative with the medium exit tube that spiral heat exchange tube's the other end passes through rotary joint, its characterized in that connects firmly the insulation cover more than two outside the rotary drum, be equipped with several screen clothes on the rotary drum outer wall in the insulation cover, and wherein two screen clothes lie in the both sides tip of rotary drum, and the feeding case is all continuous through pipeline and fan with the well upper portion that goes out the workbin, the rotary drum both ends have all connected firmly the annular movive seal section of thick bamboo of more than one, the feeding case with go out the workbin one end adjacent with the rotary drum and has all connected firmly an annular static seal section of thick bamboo more than two, a movive seal section of thick bamboo all imbeds between the corresponding static seal section of thick bamboo, still is equipped with stuffing seal between a movive seal section of thick bamboo and the static seal section of thick bamboo that corresponds, the utility model has the advantages of rotary drum heat preservation is effectual, overboard steam drain is timely, can show improvement heat transfer effect.