F - Mech Eng,Light,Heat,Weapons – 04 – C
Patent
F - Mech Eng,Light,Heat,Weapons
04
C
F04C 2/08 (2006.01) F04B 49/02 (2006.01) F04C 18/16 (2006.01) F25B 1/00 (2006.01) F25B 1/047 (2006.01) F25B 7/00 (2006.01) F25B 31/00 (2006.01) F25B 41/00 (2006.01) F25B 43/02 (2006.01) F25B 49/02 (2006.01)
Patent
CA 2074444
Title COMBINATION LIFT PISTON/AXIAL PORT UNLOADER ARRANGEMENT FOR A SCREW COMPRESSOR Inventor PETER J. LINNERT Abstract An unloading arrangement for a rotary screw compressor includes discrete and different unloading apparatus associated with the male and female rotors respectively. The unloading apparatus associated with the male rotor is an axial piston continuous unloader movably disposed in a bore which is remote from but in flow communication, through a series of ports, with the compressor's working chamber. The unloading apparatus associated with the female rotor is a step unloader which, when opened, unloads the compressor in a single, relatively large capacity step. The compressor is therefore capable of being unloaded both over a continuous operating range and in a discontinuous, stepwise fashion. By duplexing compressors of this type, continuous capacity modulation of a multiple compressor system is made available over a large operating range without the employment of compressors unloaded by slide valve mechanisms.
Fetherstonhaugh & Co.
Trane International Inc.
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