Axial compressor

Claim 1

A COMPRESSOR COMPRISING: (A) A CASING HAVING A CHAMBER WITH AXIALLY SPACED WALLS FOR CLOSING THE ENDS THEREOF; (B) A PAIR OF ROTORS DISPOSED IN SAID CHAMBER BETWEEN THE END WALLS; (C) SAID CHAMBER HAVING AN INLET AND AN OUTLET AXIALLY SPACED FROM ONE ANOTHER AT OPPOSITE ENDS OF THE CHAMBER AND BEING DISPOSED ON OPPOSITE SIDES OF A PLANE THROUGH THE AXES OF ROTATION OF BOTH ROTORS; (D) SAID ROTORS HAVING HELICAL LOBES AND GROOVES MESHING WITH ONE ANOTHER AND OPERATING TO CYCLICALLY DEFINE PRESSURE POCKETS BEING FORMED AT THE INLET END OF THE CHAMBER WHICH MOVE PROGRESSIVELY AXIALLY TO THE OUTLET END THEREOF; (E) EACH OF SAID POCKETS COMMUNICATING WITH THE INLET WHEN FORMED AND INCREASING IN VOLUME DURING SUCH COMMUNICATION TO RECEIVE FLUID, SEQUENTIALLY BEING BLOCKED FROM THE INLET AND REDUCING IN VOLUME THEREAFTER BEFORE COMMUNICATION WITH THE OUTLET TO COMPRESS THE FLUID RECEIVED THEN COMMUNICATING WITH THE OUTLET TO DISCHARGE THE COMPRESSED FLUID; (F) EACH OF SAID LOBES HAVE A LEADING FLANK SURFACE AND A TRAILING FLANK SURFACE INTERSECTING TO PROVIDE A CREST EDGE SURFACE; (G) EACH OF SAID GROOVES BEING DEFINED BY AN ARCUATE SURFACE GENERATED ENTIRELY BY THE MESHING LOBE CREST EDGE SURFACES AND TERMINATING IN A CREST EDGE SURFACE THAT GENERATES THE MESHING LOBE LEADING FLANK SURFACES; (H) SAID CREST EDGE SURFACES OF MESHING LOBES AND GROOVES COOPERATING TO FORM SEAL LINES WITH THE SURFACES THEY GENERATE SPACED BY A FORMED POCKET FOR VARYING VOLUME DEFINED BY THE LOBE AND GROOVE BETWEEN THE SEAL LINES; (I) SAID FORMED POCKETS TENDING TO FORM FLUID TRAPS WHEN SAID LOBES AND GROOVES ARE IN MESH AT THE OUTLET ENDS OF SAID ROTORS AND THE FORMED POCKETS ARE CLOSED TO THE COMPRESSOR OUTLET AFTER DISCHARGE; AND (J) THE OUTLET END OF ONE OF SAID ROTORS BEING BEVELLED REMOVING THE OUTLET ENDS OF ALL OF ONE OF SAID COOPERATING SURFACES FORMING SAID LINES TO PROVIDE ESCAPE PATHS TO THE COMPRESSOR INLET FOR FLUID FROM SAID FORMED POCKETS WHEN SUCH TRAPS ARE FORMED AFTER DISCHARGE TO RELEIVE FLUID TRAPPED THEREIN.