| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide inexpensive and high-strength screw type rotors with various sizes and shapes. <P>SOLUTION: The screw type rotor 1 includes a shaft 10 and a screw plate 20 which is fixed to the shaft and is wound around the shaft in a spiral configuration. The screw plate consists of an arcuate inner side edge section 23a of which the diameter is larger than the outer diameter of the shaft, and a plastically deformable long arcuate plate body having an outer side edge section 23b extending arcuately with a certain width against the inner side edge section. A plurality of turnback sections 24 are formed at given intervals on the outer and inner side edges. A zigzag fold line is formed on the screw plate by a first fold line connecting the turnback section of the inner side edge and the turnback section of the outer side edge nearest to the turnback section of the inner side edge to the single longitudinal direction of the screw plate and a second fold line connecting the turnback section of the outer side edge and the turnback section of the inner side edge nearest to the turnback section of the outer side edge to the single longitudinal direction of the screw plate. The spiral screw plate is formed by subjecting the first (second) fold line 25 to a mounting fold while subjecting the second fold line to a valley fold or by subjecting the first fold line to a valley fold while subjecting the second fold line to a mountain fold. <P>COPYRIGHT: (C)2013,JPO&INPIT |
