F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
230/31
F04B 49/02 (2006.01) F04B 49/00 (2006.01) F04B 49/06 (2006.01) F04B 49/08 (2006.01) F04C 18/16 (2006.01) F04D 27/00 (2006.01)
Patent
CA 1058129
CONTROL SYSTEM FOR VARIABLE CAPACITY GAS COMPRESSOR Abstract of the Disclosure A variable capacity rotary screw compressor driven by an electric motor and having an adjustable slide valve for varying compressor capacity is provided with a control system for adjusting the slide valve to regulate compressor capacity and thereby maintain a variable system condition, such as gas inlet or outlet pressure or temperature, within a predetermined range. The control system comprises first means including a current transformer for sensing changes in motor current as compressor capacity varies and a current converter connected to the current transformer for providing a first electrical signal proportional to compressor capacity. The control, system also comprises means for sensing changes in the particular system condition being monitored and for providing a second electrical signal proportional thereto. The control system further comprises means including a propor- tioning relay for receiving and comparing the aforesaid first and second electrical signals and for providing a third signal to control operation of the adjustable slide valve to thereby regulate compressor capacity and maintain the system condition within a predetermined range. - 1 -
275621
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