| 摘要 |
A cryogenic refrigerator has an upper chamber formed at an upper end portion of a cylinder above a displacer. An upper end portion of a rod is movable in a bore and lower end portion of the rod is connected to an upper end portion of the displacer. Pressure varies in the upper chamber between high and low values upon movement of the displacer. The bore is always supplied with low-pressure such that the displacer may be moved by the differential pressure between the upper chamber and the bore.
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