The invention relates to a
heat exchanger device, in particular to an efficient drum type
heat exchanger which comprises an outer drum, wherein an inner drum is arranged in the middle of the outer drum, and the interior of the inner drum is communicated with the exterior of the inner drum. At least one coil
pipe set is arranged between the inner wall of the outer drum and the outer wall of the inner drum, and the coil
pipe set coils the inner drum in a spiral mode. The coil
pipe set comprises a first
spiral coil pipe and a second
spiral coil pipe, wherein the first
spiral coil pipe and the second spiral coil pipe are in the same structure. Each spiral coil pipe is divided into two segments with different coiling diameters, and one end, with a small coiling
diameter, of the second spiral coil pipe screws in from one end, with a large coil
diameter, of the first spiral coiling pipe, and one end, with a large coiling
diameter, of the second spiral coil pipe is coiled on the outer side of one end, with a small coiling diameter, of the first spiral coil pipe. The efficient drum type
heat exchanger has the advantages of being capable of effectively improving heat exchange efficiency, strengthening heat exchange effect, and the like.