Compressor-Scavenging Eductor System.
Patent, filed 26 Jul 85, Patented 7 Apr 87,
DEPARTMENT OF THE NAVY WASHINGTON DC
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The present invention overcomes performance losses of positive displacement compressors due to internal liquid recirculation. This is achieved by removing or scavenging liquid that leaks out of the compression pocket before it is captured by another lower-pressure compression pocket of the compressor. The scavenged liquid is collected in the bottom of the compressor pressure vessel and cooled before it is reinjected in the compressor to complete the cycle. Positive-displacement compressors are commonly used in gas and refrigeration service. Liquid, such as oil or water, is often injected into these compressors in order to lubricate the mechanism. The liquid injection also serves to seal machine clearances to prevent leakage of the compressed fluid and further serves to absorb the heat of the compression cycle itself. The injected liquid is separated from the compressed fluid in a discharge receiver resulting in compressed fluid in a discharge receiver resulting in compressed fluid which is free of injected liquid and separated liquid. The separated liquid is cooled and reinjected into the compressor to complete the cycle. Flow of the rejected liquid back into the compressor is maintained by the compressor differential pressure and is controlled by an orifice or other pressure reducing device. Compressors, Pat-cl-418-85. jes
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