Floating ring type mechanical seal

A floating ring type mechanical seal in which a floating ring is pinched and held between a rotary ring provided in a rotary shaft and a stationary ring provided in a seal casing to be movable in an axial direction while being urged toward the rotary ring so that a relative rotation of the floating ring with respect to the stationary ring is inhibited,

• wherein the rotary ring is made of a sintered compact of SiC or cemented carbide, and
• wherein a diamond film is formed on a sealing surface sliding on the floating ring in the rotary ring and a diamond film continuous to the diamond film of the sealing surface is formed on an inner peripheral surface of the rotary ring and a rear surface, which is a surface opposite to the sealing surface, in the rotary ring.

A floating ring type mechanical seal in which a floating ring is pinched and held between a rotary ring provided in a rotary shaft and a stationary ring provided in a seal casing to be movable in an axial direction while being urged toward the rotary ring so that a relative rotation of the floating ring with respect to the stationary ring is inhibited,

• wherein the rotary ring is made of a sintered compact of SiC or cemented carbide, and
• wherein a diamond film is formed on a sealing surface sliding on the floating ring in the rotary ring and a diamond film continuous to the diamond film of the sealing surface is formed on an inner peripheral surface of the rotary ring and an outer peripheral surface of the rotary ring.