Method and apparatus for observing operating state of mechanical seal.

摘要

A method and an apparatus for observing operating state of a mechanical seal are disclosed. The apparatus comprises a sensor (1), amplifier means (2, 4), a root mean square value voltmeter (5) and a computer (7). Root mean square values of outputs of high frequency acoustic emission generated by a mechanical seal provided on a rotary machine are inputted in the computer (7) which performs operations to obtain a maximum value, a minimum value, a mean value and deviation of the continuously measured root mean square values. The computer also computes the magnitude of each of the values, any tendency for variation thereof and their mutual relationships, whereby the operating state of the mechanical seal is judged in terms of damage of and the possibility of leakage of sealed fluid from the sliding surfaces of the mechanical seal.