Mechanical seal

Abstract

A mechanical seal including a rotary side unit provided on a rotary shaft of a rotary machine so as to be rotatable therewith and having a rotary sealing ring, and a stationary side unit provided on a casing, of the rotary machine, surrounding the rotary shaft, the stationary side unit having a stationary sealing ring on which the rotary sealing ring slides, sliding portions of the rotary sealing ring and the stationary sealing ring being cooled by a flushing fluid, includes: a first temperature detection part provided in the stationary side unit and configured to detect a first temperature of the flushing fluid before cooling the sliding portions; and a second temperature detection part provided separately from the first temperature detection part in the stationary side unit and configured to detect a second temperature of the flushing fluid after cooling the sliding portions.

Dependencies are inferred from the claim text.