| 摘要 |
FIELD: engineering industry; pumps with decreased noise and vibration level. ^ SUBSTANCE: Pump includes frame, main and secondary rotors with screws, drive motor, and pony motor on the main and driven shafts. The screw's projection width does not equal the width of space on each rotor. Projection width on the main rotor equals the projection width of the driven rotor. ^ EFFECT: decreased noise and vibration level. ^ 1 dwg |
