초록 ▼

A seal for sealing between a hollow outer shaft and an inner shaft concentric with the outer shaft has a seal ring with a plurality of segments extending around the inner shaft. The seal ring has an outer circumferential face confronting the inner surface of the outer shaft, a first side face expose

A seal for sealing between a hollow outer shaft and an inner shaft concentric with the outer shaft has a seal ring with a plurality of segments extending around the inner shaft. The seal ring has an outer circumferential face confronting the inner surface of the outer shaft, a first side face exposed to a region of high pressure and a second side face confronting a mating ring secured to the inner shaft and having a portion thereof exposed to a region of lower pressure. A segmented compensating ring extends around the inner shaft and spaced from the seal ring in the region of high pressure. A flange secured to the inner shaft limits the axial movement of the compensating ring away from the seal ring. A continuous balancing ring between the seal ring and the compensating ring has a pair of conical faces mating with conical faces on the seal ring and compensating ring, respectively. Advantageously, hydrodynamic and closed pockets in the bearing surfaces are used to vary the contact forces.

대표청구항 ▼

A seal between a hollow outer shaft and an inner shaft concentric with the outer shaft having a seal ring having a plurality of segments extending around the inner shaft, an outer circumferential face confronting the inner surface of the outer shaft, a first side face exposed to a region of high pre

A seal between a hollow outer shaft and an inner shaft concentric with the outer shaft having a seal ring having a plurality of segments extending around the inner shaft, an outer circumferential face confronting the inner surface of the outer shaft, a first side face exposed to a region of high pressure between the shafts and a second side face having a portion thereof confronting a mating ring secured to the inner shaft and a portion thereof exposed to a region of lower pressure, and means for urging the outer face of the seal ring into conact with the inner surface of the outer shaft, characterized in that: a segmented compensating ring extends around the inner shaft and is spaced from the seal ring in the region of high pressure, a flange is secured to the inner shaft for limiting the axial movement of the compensating ring away from the seal ring, said seal ring and said compensating ring each have a conical face with the said conical faces facing toward each other; a continuous balancing ring lies between the seal ring and the compensating ring and has a conical face mating with the conical face of the seal ring and a conical face mating with the conical face of the compensating ring, Whereby the centrifugal loading of the compensating ring urges the balancing ring towards the seal ring creating a radially inwardly force on the seal ring compensating for a portion of the centrifugal loading of the seal ring.