MECHANICAL SEAL

摘要

A mechanical seal comprising a rotary seal ring (40) and stationary seal ring (44) in slide contact with each other for hermetically sealing fluid, in which a hermetically sealing blade-like end (40a) formed on a seal ring (40) so as to be pressed to a smooth end surface (44a) for hermetic sealing formed on the other seal ring (44) by energizing force of a coiled spring (46) or plate spring (48) is formed in such a manner that both the inside diameter surface (40a2) and outside diameter surface (40a1) of said seal ring (40) are inclined with respect to the edge surface (40a3) of said ring at an angle of 90 DEG or larger, preferably at 105 DEG to 150 DEG , to form a concentric rotation shape, whereby the seal is easily worked and hermetic sealing function is kept stable for a long time without causing breakage. Pressure at the springy contact surface is increased for ensuring high hermetical sealing function even against large fluid pressure fluctuation.