Patent ID: 7491044

Claim:
A sealing device of fluid machinery, comprising: a stationary member; a orbiting member, an end surface of which slides on an inner face of the stationary member; and a sealing member to be fitted into a sealing groove engraved on the end surface along the ridge line of the end surface, a sliding contact surface of the sealing member being pressed onto an inner surface of the stationary member with a predetermined force to slide on the inner surface in order that fluid sealing is secured between the sliding contact surface of the sealing member and the inner surface of the stationary member; wherein the sealing member is divided in a plane parallel to the sliding contact surface into two parts of an upper ring and a lower ring, the upper ring contacting the sliding contact surface and the lower ring facing a bottom surface of the sealing groove; and a back-up ring made from elastic material is provided to be fitted into grooves for the back-up ring, which are engraved on the divided surfaces of the upper ring and the lower ring, in a place not facing the sealing groove, along the longitudinal direction of the sliding contact surface.