Patent ID: 9163634
Filing Date: 2015-10-20
Classification: F04C

Abstract:
1. A single screw gas compressor comprising: a housing including a cylindrical bore; primary and secondary gate rotors mounted for rotation in the housing, each gate rotor having a plurality of gear teeth; a main rotor rotatably mounted in the bore and having a plurality of grooves and a plurality of threads, wherein each groove meshingly engages at least one of the gear teeth from each gate rotor; a primary economizer port in communication with the cylindrical bore; a secondary economizer port in communication with the cylindrical bore; and a primary discharge port opening and a secondary discharge port opening, wherein the primary economizer port is situated a rotational distance along a bore wall from the primary discharge port opening that exceeds the rotational distance along the bore wall between the secondary economizer port and the secondary discharge port opening; wherein the secondary economizer port is situated on one of a top housing portion and a bottom housing portion, and the primary economizer port is situated on the other of the top housing portion and bottom housing portion; and wherein the secondary economizer port receives gas from an external source during compressor loading between about 10% to about 59% of full load capacity.