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The compression cycle begins after suction gas fills the top andbottom grooves of the main screw at the suction end of the casing.Since the screw compressor has two gaterotors, the compressionprocess occurs simultaneously on opposite sides of the screw; thetop and bottom. As the main screw rotates, it in turn drives thegaterotors. The engagement of the gaterotor with a screw groovetraps the suction gas and begins the compression process. As thescrew rotates, the engagement of the gaterotor continues, thusreducing the initial volume of the groove and increasing thepressure in the groove. Once again this occurs simultaneously onopposite sides of the screw.Finally, as the main screw rotates toward the completion of thecompression cycle, the groove aligns with a port in the housing atthe discharge end of the casing. The gas and any liquid in the grooveare radially discharged through the port into the discharge plenum.Since there are six grooves in the main screw, the compressionprocess simultaneously occurs six times in two locations perrevolution of the screw. Operation at 3000 RPM results in 18,000simultaneous compression strokes at the top and bottom groovesper minute and a relatively smooth flow of discharge gas.groove approaches discharge pressure. When the gaterotor firstengages with the main screw the compression process begins. Asrotation continues, the gaterotor tooth area exposed to the gaspressure increases. The resultant force creates the axial loads onthe gaterotor assembly. Approximately half way through the stroke,or when the radial axis of the gaterotor is perpendicular to therotational axis of the main screw, the maximum area of thegaterotor is exposed to the gas pressure. As the compression cyclecontinues, the pressure within the groove increases but the areaof the gaterotor exposed to the discharge pressure continues todecrease. The lower loads transmitted to the components andbearings result in higher reliability. At the end of the stroke, thearea of the gaterotor has been reduced to zero as it disengagesfrom the main screw.Another design feature of the Single Screw compressor thatenhances reliability results from the fact that the loads on thegaterotor assemblies are well defined and isolated from the mainscrew. Since the gaterotor assemblies are independent and do notinterfere with the rest of the main screw body, bearings can besized for maximum reliability
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