Importance

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Abstract

For the sealing of a pair of members from which a CO2 refrigeration cycle is configured, the provision of a seal structure with both excellent permeability resistance with respect to a CO2 refrigerant and cold resistance. Although a seal member 1 has on the one hand excellent permeability resistance with respect to a CO2 refrigerant but a relatively inferior cold resistance, by the prevention thereof of exposure at all times to the exterior air by the interposing between the exterior air side of a seal member 2 with a characteristic cold resistance, even if a loss of elasticity of the seal member 1 caused by low temperature occurs, leak of a large quantity of refrigerant is avoided. Simultaneously, the blow-by of a large quantity of refrigerant due to the pressure difference between the exterior air and refrigerant, and an increase in the quantity of leak during recovery to normal temperature caused by the generation of twist and warp in the seal members due to shock when blow-by occurs can be avoided.

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First Claim