Patent ID: 8920149

Claim:
A single-screw compressor, comprising: a screw rotor having an outer periphery with a helical groove formed therein, a first axial end of the screw rotor forming a suction side and a second axial end of the screw rotor forming a discharge side; a gate rotor including a plurality of radially arranged gates engaged with the helical groove; a drive mechanism configured to rotate the screw rotor; a cylinder configured to accommodate the screw rotor such that a compression chamber enclosing a fluid is defined in the helical groove; a discharge port arranged such that the fluid in the compression chamber flows through the discharge port toward the discharge side of the screw rotor, and an adjustment mechanism configured to adjust a compression ratio of the compression chamber within a predetermined range, the adjustment mechanism being further configured to adjust the compression ratio of the compression chamber to a minimum compression ratio immediately before or when operation of the screw rotor is stopped, and including a slide groove formed in an inner wall of the cylinder along an axis of the cylinder, a slide valve configured to slidably fit in the slide groove to change a location where the compression chamber and the discharge port communicate with each other, and a displacement part configured to displace the slide valve such that the slide valve is at a first position closest to the suction side of the screw rotor immediately before or when operation of the screw rotor is stopped.