Improved finned tube structure

The utility model discloses an improved finned tube structure which comprises a finned tube body, a round tube is arranged outside the finned tube body, threaded holes are formed in the left side of the top and the left side of the bottom of the finned tube body, bolts are arranged on the right side of the top and the right side of the bottom of the round tube, and a containing groove and a sealing ring are arranged at the right end of the round tube. A plurality of annular grooves are formed in the outer portion of the circular pipe and distributed in the outer portion of the circular pipe atequal intervals. According to the improved finned tube structure, the telescopic rod, the spring and the protruding block are used in cooperation, the protruding block can be inserted into the semicircular groove under the action of elastic force of the spring, then the fin body is fixed into the annular groove, people can pull out the fin body forcibly to enable the protruding block to be retracted into the square groov