To provide a seal ring capable of avoiding a risk that clogging is generated in a circulation device.
This seal ring is a seal ring 1 comprising a seal sleeve 2 made of a high molecular material. When using the seal ring 2 for a purpose, the seal sleeve 2 has an L-shape cross section and the seal sleeve 2 is formed of a fixed area 3 extended in the radial direction and a sealing area 4 extended in the axial direction to surround a surface 5 of a mechanical element 6 to be sealed, while sealing it with a preload, and the sealing area 4 has at least one circulation device 7 for circulating a medium to be sealed toward a space 8 to be sealed on a side thereof opposite to the surface 5. In the circulation device 7 formed of at least one circulation groove 10 spirally extended from the space 8 to be sealed to the peripheral environment 9, cross sectional area of the circulation groove 10 is increased as it comes close to the peripheral environment 9.
KAMMERER ERIC
Takahiko Mizobe
Kiyoharu Nishiyama