Phase modulation device for Stirling refrigerator and Stirling refrigerator

The utility model relates to the technical field of low-temperature refrigeration, and discloses a phase modulation device for a Stirling refrigerator. The phase modulation device for the Stirling refrigerator comprises a pipe body which defines a circulation space so that a heat transfer working medium can flow along the circulation space; and the porous material is filled in the circulation space in a stacking and/or rolling manner. Phase modulation is carried out by arranging the short pipe body and the porous material located in the pipe body, and the phase modulation capacity of the phase modulation device is enhanced. Compared with a traditional inertia tube, on the premise of the same phase modulation capacity, the length of the tube body in the embodiment is greatly shortened, the length of the tube body can be reduced from several meters of the traditional inertia tube to only several centimeters of the traditional inertia tube, and then the length of the Stirling cryocooler can be shortened. The uti