Screw compressor having a gate rotor assembly with pressure introduction channels

A single-screw compressor comprising:

• a casing;
• a screw rotor rotatably accommodated in the casing;
• a gate rotor including a plurality of flat-plate-shaped gates formed in a radial pattern and meshing with a helical groove of the screw rotor;
• and
• a gate rotor supporting member rotatably supporting the gate rotor,
• the single-screw compressor compressing a fluid in a compression chamber defined by the screw rotor, the casing and the gates when the screw rotor is rotated,
• the gate rotor supporting member including a plurality of gate supporting portions supporting the gates from a back surface side thereof, and
• the gate rotor and the gate rotor supporting member forming a gate rotor assembly including a plurality of pressure introduction channels, each pressure introduction channel being configured and arranged to introduce a fluid pressure from a front surface side of one of the gates into a back pressure space between a back surface of the gate and the gate supporting portion supporting the gate.