Micro processor controller of compression ratio with full load in equivalence to a screw compressors driving motor current as well as a procedure for controlling an electric motor powered compressor

Abstract

Abstract The invention refers to a control device in order to change the inner compression conditions in the compressor (10) when it works under full load conditions and to at the same time sense the compressor motor current. The compression conditions are changed through affecting a composite vent (32, 33) which works together with the compressor's rotors (18, 19). The composite vent is affected in one direction, which is determined by an accompanying computer programme (110, 112), as long as the sensed current decreases. When the current begins to increase the direction is shifted and so forth. Should the intake pressure sink under a pre-stated "best value" the vent sections are separated (32, 33) in order to allow the compressor to work at a lower load.<IMAGE>

Inventors

• 👤 D A Murphy
• 👤 P C Spellar

Bibliographic Details