Production manner of screw rotor, screw rotor, and water injection type screw compressor

摘要

PPROBLEM TO BE SOLVED: To provide a method of manufacturing a screw rotor which improves quality; the screw rotor; and a water injection type screw compressor. PSOLUTION: In the method of manufacturing the screw rotor having a helical tooth section, two or more resin blocks 20 containing a short fiber reinforcing material 18 and a granular reinforcing material 19 are respectively formed into a circular plate shape. Two or more resin blocks 20 are inserted through a rotor shaft 21 and are stacked in the axial direction thereof. Two or more stacked resin blocks 20 are machined to form the tooth section. PCOPYRIGHT: (C)2011,JPO&INPIT