PERFORMANCE-CONTROLLED OIL-FLOODED SCREW COMPRESSOR WITH ADJUSTABLE BUILT-IN VOLUME RATIO

摘要

In a meshing-screw compressor of the oil-injection type semi-rotary valve plates 2, 3 operated by a pair of servo-motors 4 (only one shown in Fig. 1) control the outlet port, the servo-motors in turn being controlled by a piston-actuated valve 5 in accordance with the pressure at the outlet end of the rotor chamber and the pressure in the delivery duct. The said pressures are applied to the valve's piston 6 through passages 18,19. Alternatively, there may be a single servo-motor operating one of the valve-plates. IMAGE