Stirling refrigerator

摘要

A Stirling refrigerator (1), which prevents oil rising, and includes a housing (2), cylinder (17,18), piston (19,25), piston rod (21,27) and an oil seal bellows (22,28). The oil seal bellows (22,28) seals a space between the housing (2) and the cylinder (17,18), wherein a tip end (254,257) of the oil seal bellows (22,28) is sealed and fixed on the piston (19,25) or on the piston rod (21,27) inside the cylinder (17,18), and a base end (252,256) of the oil seal bellows (22,28) is installed on the housing (2). The oil seal bellows (22,28) reciprocates with a stroke, wherein the tip end (254,257) of the oil seal bellows (22,28) is compressed to a compression side from a position of free length then returns to the position of free length.