| 摘要 |
PURPOSE:To detect the relatively slight rubbing action of a rotary machine and the magnification state thereof, by using a sound judge circuit and a vibration judge circuit and judging the generation state of the rubbing action by the combination of a sound signal and a vibration signal. CONSTITUTION:A sound detection sensor 3 detects the ultrasonic wave generated by the sliding, that is, the rubbing action between the rotary part and stationary part of a rotary machine 1. A sound judge circuit 9 compares the sound signal from the sound detection sensor 3 with a predetermined set value to judge the generation of the rubbing action. A vibration detector 12 detects the vibration of the rotary machine 1 and a vibration judge circuit 14 compares the vibration signal from the vibration detector 12 with a predetermined set value to judge the generation of an abnormal action. When the sound judge circuit 9 judges the existence of the rubbing action, said circuit 9 outputs a caution signal and, further, when the vibration judge circuit 14 judges the generation of the abnormal action, said circuit 14 outputs an alarm signal through a logical circuit 10.
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