| 摘要 |
The present invention describes a uni-axial screw pump to convey viscous fluids with high pump efficiency wherein restraining devices restrain the fluid's tendency to rotate around the axis as the rotor rotates. As a result, all the fluid trapped between the helical thread and inner surface of inner cylindrical casing is forced in the axial direction towards the discharge end. It can also be employed as hydraulic turbine, thermo motor, liquid motor, extruder, molder and etc. The screw pump includes a thread disconnected perpendicularly to the axis to make a plurality of thread sections, a plurality of annular restraining devices being inserted in the annular gaps formed between disconnected thread sections. The annular restraining devices have restraining elements and openings for the fluid to be conveyed through, inner cylindrical sections being axially disposed between the inserted annular restraining devices to enclose the screw rotor.
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