| 摘要 |
PROBLEM TO BE SOLVED: To positively discharge inside air and gas even if minute cracks exist in the clearance seal of pistons (10), (10), in a compressor (1) and a cold-storage medium in an expander (30) to reduce contamination of a cooling medium as far as possible, and increase the reliability and life of a refrigerator in the case of vacuum-drawing at a charge port (50) in the baking treatment in a free-displacer type Stirling refrigerator comprising the compressor (1) and the expander (30). SOLUTION: Three charge-ports (50), (50), etc., are opened in a easing (2) facing a back-pressure space (12) of the compressor (1), and a connection tube (26) for connecting the compressor (1) and the expander (30). An evacuation is carried out simultaneously at the charge ports (50), (50), etc., to exhaust air and gas from both side spaces of the clearance seal and cracks without receiving a resistance.
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