초록 ▼

A surge counter for a rotating compressor is provided which detects surging by monitoring the vibration signal from an accelerometer mounted on the shaft bearing of the compressor. The circuit detects a rapid increase in the amplitude envelope of the vibration signal, e.g., 4 dB or greater in less t

A surge counter for a rotating compressor is provided which detects surging by monitoring the vibration signal from an accelerometer mounted on the shaft bearing of the compressor. The circuit detects a rapid increase in the amplitude envelope of the vibration signal, e.g., 4 dB or greater in less than one second, which is associated with a surge onset and increments a counter. The circuit is rendered non-responsive for a period of about 5 seconds following the detection which corresponds to the duration of the surge condition. This prevents multiple registration of counts during the surge period due to rapid swings in vibration amplitude during the period.

대표청구항 ▼

A surge counter in combination with a rotating compressor, comprising: vibration sensing means for generating an analog signal indicative of vibration of said rotating compressor; an amplitude envelope monitoring means for generating an output rate signal proportional to the rate of change of the am

A surge counter in combination with a rotating compressor, comprising: vibration sensing means for generating an analog signal indicative of vibration of said rotating compressor; an amplitude envelope monitoring means for generating an output rate signal proportional to the rate of change of the amplitude envelope of said analog signal; delayed reset comparator circuit means responsive to a preselected level of said output rate signal for generating a count increment signal when said output rate signal exceeds said preselected level and remaining non-responsive for a delay period corresponding to a known period of surge duration in said rotating compressor; and a counter connected to receive said count increment signal.