Stepping type unloading system for helical screw rotary...

Details Stepping type unloading system for helical screw rotary... Stepping type unloading system for helical screw rotary...

F - Mech Eng,Light,Heat,Weapons

04

C

230/34, 230/39

F04C 18/00 (2006.01) F01C 1/16 (2006.01) F04B 49/00 (2006.01) F04C 18/16 (2006.01)

Patent

CA 1178256

STEPPING TYPE UNLOADING SYSTEM FOR HELICAL SCREW ROTARY COMPRESSOR ABSTRACT OF THE DISCLOSURE A stepping piston is projected into the path of a slide valve drive piston to limit piston movement and thus the slide valve towards maximum unload position determined by piston bottoming out against the cylin- der wall. The slide valve main drive piston stroke is also correlated to desired slide valve positions along the intermeshed helical screw rotors of the helical screw rotary compressor to provide, for example, stepped unloading at compressor full load, two-thirds full load, and one-third full load.

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