초록 ▼

Surge control systems are provided for compressors which supply air to a pneumatic load. A signal proportional to the pressure ratio of the outlet pressure to the inlet pressure plus a selected reference pressure is compared to a measured weight flow rate of air through the compressor to provide a v

Surge control systems are provided for compressors which supply air to a pneumatic load. A signal proportional to the pressure ratio of the outlet pressure to the inlet pressure plus a selected reference pressure is compared to a measured weight flow rate of air through the compressor to provide a vent valve command signal. If the measured pressure ratio plus the reference pressure ratio exceeds the measured flow rate, a surge condition may ensue. The vent valve position command signal causes a venting valve to vent a portion of the air provided to the load, which reduces the measured pressure ratio and increases weight flow rate. During normal operation of the compressor, the vent valve command signal is zero for all values of weight flow rate. A transient control channel is provided which is responsive to the rate of change of the measured pressure ratio and/or measured weight flow rate.

대표청구항 ▼

A surge control system for a compressor which provides air to a pneumatic load comprising: means for generating a pressure ratio signal proportional to a ratio of the outlet pressure of the compressor to the inlet pressure of the compressor; means for generating a signal proportional to the weight f

A surge control system for a compressor which provides air to a pneumatic load comprising: means for generating a pressure ratio signal proportional to a ratio of the outlet pressure of the compressor to the inlet pressure of the compressor; means for generating a signal proportional to the weight flow rate of the air through the compressor; means for providing a vent valve command signal if the pressure ratio signal deviates from said weight flow rate signal by a predetermined amount; and a vent valve position control responsive to said vent valve command signal for regulating the position of a valve which controls the flow of the air through the compressor.