Patent ID: 6962479

Claim:
A compound compressor of simple and lightweight construction with a high pressure ratio comprising: a centrifugal compressor with a plurality of radial vanes on the front face; some said radial vanes are short radial vanes and finish at the centrifuge rim; some said radial vanes are long radial vanes and overhang the centrifuge rim; said long radial vanes are one quarter to one third in number of said short radial vanes; a conical screw body; said body mates up to said rim and extends behind said rim further aft; said body tapers towards the rear; said body has a plurality of helical vanes; said vanes are the same in number as said long radial vanes; said helical vanes mate up with said long radial vanes at the centrifuge rim; said helical vanes each complete one full turn; a driven shaft; said centrifuge and said screw body are complete and separate parts; said parts form whole compressor; said compressor fits on to said shaft; a compressor casing surrounding said parts; said casing encloses air within.