A cryogenic refrigerator generates a continuous closed refrigeration cycle. It primarily consists of three parts: a motor drive unit, a cylinder, and a piston inside the cylinder. High-pressure helium gas from the compressor enters the refrigerator through the gas supply interface. The motor drives a crank-link mechanism and a rotating distribution valve, allowing helium gas to enter the piston-regenerator. As the drive unit and distribution valve operate, the helium gas flows back through the piston-regenerator, returns to the housing, and then goes back to the compressor through the return gas interface. The helium gas expands and cools within the piston-regenerator, achieving low temperatures at the first and second stage cold heads.