| 摘要 |
PCT No. PCT/JP97/00484 Sec. 371 Date Oct. 21, 1997 Sec. 102(e) Date Oct. 21, 1997 PCT Filed Feb. 21, 1997 PCT Pub. No. WO97/31228 PCT Pub. Date Aug. 28, 1997Occurrence of leakage of refrigerant around a seal member in cryogenic state is suppressed. The seal member 32 is formed from unsaturated polyester-PTFE with an unsaturated polyester mixing ratio of 20% to 35%. A plurality of slits 36 extended axially and penetrating through radially are provided in an end portion 35 of an outer circumferential wall 32a. Thus, by a synergistic effect of the use of a material small in the heat shrinkage factor and the reduction of radial shrinkage of the whole outer circumferential wall 32a attributable to the aforementioned configuration, the sealing properties in the cryogenic state are enhanced so that the occurrence of leakage of refrigerant is suppressed to the utmost, thereby preventing deterioration in the refrigeratability.
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