SINGLE-SCREW COMPRESSOR, AND SCREW ROTOR MACHINING METHOD

摘要

In a screw rotor (40), a first suction-side region (45) is formed in a first sidewall face (42) of a helical groove (41). In the first sidewall face (42), the portion from its starting end to the position, at which a compression chamber (23) is closed off, forms the first suction-side region (45) as a whole. The first suction-side region (45) is made lower than the portion of the first suction-side region (45) in the first sidewall face (42), so that it does not contact the gate (51) of a gate rotor (50).