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1. (WO1997016645) MULTI-ROTOR HELICAL-SCREW COMPRESSOR
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CLAIM 1. A helical-screw rotary compressor comprising:
a first rotor; and
at least two second rotors axially aligned with said first rotor, said first rotor in communication with said second rotors whereby said first rotor drives said second rotors, said second rotors being generally equally spaced about said first rotor.

CLAIM 2. The compressor of claim 1 wherein:
said first rotor comprises a male rotor including a plurality of lobes with a degree of wrap; and
said at least two second rotors comprises at least two female rotors, each of said female rotors having a plurality of flutes with a degree of wrap.

CLAIM 3. The compressor of claim 2 wherein said male rotor comprises:
a generally cylindrical metal shaft; and
a ring having said lobes integrally depending therefrom, said ring disposed on said shaft for rotation therewith, said ring comprised of a composite material.

CLAIM 4. The compressor of claim 2 wherein said at least two female rotors comprises two female rotors.

CLAIM 5. The compressor of claim 2 wherein said at least two female rotors comprises three female rotors.

CLAIM 6. A helical-screw rotary compressor comprising:
a compressor housing;
a drive motor disposed in said compressor housing;
a first rotor disposed in said compressor housing and in communication with said drive motor, whereby said drive motor drives said first rotor; and
at least two second rotors axially aligned with said first rotor, said first rotor in communication with said second rotors whereby said first rotor drives said second rotors, said second rotors being generally equally spaced about said first rotor.

CLAIM 7. The compressor of claim 6 wherein:
said first rotor comprises a male rotor including a plurality of lobes with a degree of wrap; and
said at least two second rotors comprises at least two female rotors, each of said female rotors having a plurality of flutes with a degree of wrap.

CLAIM 8. The compressor of claim 7 wherein said male rotor comprises:
a generally cylindrical metal shaft coupled to said drive motor; and
a ring having said lobes integrally depending therefrom, said ring disposed on said shaft for rotation therewith, said ring comprised of a composite material.

CLAIM 9. The compressor of claim 7 further comprising:
an induction side plate disposed at an induction end of said male rotor, said induction side plate being generally cylindrical and having an outside diameter about the same as a pitch diameter of said male rotor; and
a discharge side plate disposed at a discharge end of said male rotor, said discharge side plate being generally cylindrical and having an outside diameter about the same as a root diameter of said male rotor.

CLAIM 10. The compressor of claim 9 wherein said compressor housing comprises: an induction housing portion;
a main housing portion; and
a discharge housing portion, said discharge housing portion including,
an inner circumferential surface for receiving said discharge side plate, with a clearance being defined between said inner circumferential surface and an outer circumference of said discharge side plate,
a countersunk surface depending from said irmer circumferential surface and terminates at an opening, said countersunk surface depending from said inner circumferential surface allows said clearance to be sealed by a liquid in said compressor, and
at least two discharge porting schemes, each positioned for
communication with discharge port areas of said male rotor and each corresponding said female rotor.

CLAIM 1 1. The compressor of claim 10 wherein each of said discharge porting scheme comprises:
a first stepped down portion defined by an intersection of said counter sunk surface and said inner circumferential surface, an edge which generally follows a root diameter of a corresponding said female rotor and a curved edge which communicates with a periphery of remaining discharge port areas of said male rotor and said corresponding said female rotor, whereby said first stepped down portion provides trap pocket relief;
a second stepped down portion depending from said first stepped down portion, said second stepped down portion generally aligned with an axial discharge port area of said corresponding said female rotor; and
wherein said first and second stepped down portions lead to a discharge opening generally aligned with a radial discharge area of said male rotor and said corresponding said female rotor.

CLAIM 12. The compressor of claim 8 further comprising:
an induction side plate disposed at an induction end of said male rotor, said induction side plate being generally cylindrical and having an outside diameter about the same as a root diameter of said male rotor;
a discharge side plate disposed at a discharge end of said male rotor, said discharge side plate being generally cylindrical and having an outside diameter about the same as a crest diameter of said male rotor; and
a plurality of dowels attached to said induction and discharge side plates for retaining said ring on said shaft.

CLAIM 13. The compressor of claim 12 wherein:
said dowels are disposed in cooperating grooves formed at an outer surface of said shaft and an inner surface of said ring.

CLAIM 14. The compressor of claim 7 wherein said at least two female rotors comprises two female rotors.

CLAIM 15. The compressor of claim 7 wherein said at least two female rotors comprises three female rotors.