Pipeline passive zero energy consumption freeze-proofing device based on PCM

The invention discloses a pipeline passive zero energy consumption freeze-proofing device based on PCM. The pipeline passive zero energy consumption freeze-proofing device based on PCM comprises a work pipe, an erosion resistant coating, a PCM layer, an embedded support, a case pipe and a heat insulation layer. The work pipe (1) is located on the innermost side; the erosion resistant coating is located on the outer side of the work pipe (1); the PCM layer (3) is located in a cavity structure between the erosion resistant layer (2) and the case pipe (5); the embedded support (4) is also locatedbetween the erosion resistant layer (2) and the case pipe (5); and the heat insulation layer (6) is attached to the outer side of the case pipe (5) and serves as the outermost layer structure. The PCM layer (3) is filled with a phase-change medium which is liquid at the room temperature; the embedded support (4) used for fixing the cavity structure between the erosion resistant coating (2) and the case pipe (5) are of a branch-shaped structure; and the case pipe (5) and the erosion resistant coating (2) provide a containing cavity for the PCM layer (3) together. The pipeline passive zero energy consumption freeze-proofing device based on PCM can achieve the technical purposes that no power facility or energy consumption is needed, the structure is simple, implementation is easy, operationand maintenance are convenient, and the requirements for energy conservation and environment protection are met.