High-temperature phase change heat accumulation pipe and heat accumulator

The invention provides a high-temperature phase change heat accumulation pipe and a heat accumulator. The heat accumulator comprises a casing and a high-temperature phase change heat accumulation pipe arranged in the casing. The high-temperature phase change heat accumulation pipe is characterized in that the high-temperature phase change heat accumulation pipe comprises an S-shaped working medium conduit, the outer side of the S-shaped working medium conduit is provided with annular fins, a fan ring heat accumulation unit is installed between the annular fins, a phase change material is filled in the fan ring heat accumulation unit, and a working medium is installed in the S-shaped working medium conduit and is mixed molten salt. The invention utilizes the solid-liquid phase change process of the phase change material to complete the storage and release of energy, has the advantages of small volume, large heat accumulation density and constant-temperature heat release and has a certain development prospect.