Patent ID: 7900934
Filing Date: 2011-03-08
Classification: F16J

Abstract:
1. A carbon dioxide gas sealing enclosed device to seal a part between two members coaxially assembled, the device comprising: a seal ring made of an elastomeric body and mounted in an annular mounting groove provided at one of the two members; a backup ring provided at a low pressure side in a width direction beyond the seal ring; a tapered part provided on a peripheral surface at a groove bottom side of the backup ring so as to incline in such direction that a distance between the peripheral surface of the backup ring and a peripheral surface of the other member is gradually reduced toward a low pressure side; a tapered groove bottom part provided on a groove bottom surface of the mounting groove so as to correspond to the tapered part of the backup ring; and a gap provided at a low pressure side of the backup ring in the mounting groove when a pressure is applied from a high pressure side, and a tapered surface provided on a peripheral surface at the side opposite to the tapered part of the backup ring so as to approach a peripheral surface of the other member toward a low pressure side from a side end surface at a high pressure side, the tapered part of the backup ring having a two-stage taper formed with a high pressure side tapered part and a low pressure side tapered part having a larger inclination angle than that of the high pressure side tapered part.