Piston unloader arrangement for screw compressors

F - Mech Eng,Light,Heat,Weapons – 04 – C

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F04C 18/16 (2006.01) F01C 1/16 (2006.01) F04C 29/10 (1995.01)

Patent

CA 2136025

A screw compressor employs a piston unloader which is disposed in a bore remote from the compressor's working chamber. Flow communication between the bore and working chamber is through a series of non-overlapping unloader ports. The unloader piston has a notched end face which effectively causes the unloader ports to overlap in operation. Precise and continuous capacity control of the compressor over a predetermined portion of its operating range is thereby achieved while internal high to low side gas leakage within the compressor and the clearance volume of the unloader ports is minimized. Compressor efficiency is thereby increased.

Un compresseur à vis utilise un dispositif de déchargement à piston qui est placé dans un alésage à distance de la chambre de travail du compresseur. L'écoulement entre l'alésage et la chambre de travail se fait au moyen d'une série d'orifices de décompression sans chevauchement. Le piston de déchargement a une surface à extrémité encochée qui provoque en fin de compte un chevauchement des orifices de décompression pendant le fonctionnement. On obtient ainsi une régulation de puissance précise et continue pour une partie préétablie de la plage de fonctionnement du compresseur, tandis que les fuites de gaz internes à haute et à basse pression dans le compresseur et le volume du jeu des orifices de décompression sont réduits. L'efficacité du compresseur est ainsi améliorée.

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