What is a screw pump and what are the advantages of a screw pump?

Screw pump, also known as “screw pump” and “Archimedes screw pump“. A pump that uses the rotation of spiral blades to cause the water body to spiral upward along the axial direction.
The screw pump device includes three parts: the prime mover, the variable speed transmission device and the screw pump. It is specifically composed of screw blades, pump shafts, bearing seats and shells.

Screw pump
Screw pump

The screw pump only changes the potential energy of the fluid, which is different from the vane water pump in converting mechanical energy into potential energy and kinetic energy of the transported liquid.
The screw pump has a simple structure, is easy to manufacture, has a large flow rate, small head loss, high efficiency, and is easy to repair and maintain. However, it has low lift and low speed and requires a transmission device. It is mostly used in irrigation, drainage, and lifting of sewage and sludge.

Compared with vane pumps, screw pumps have the following advantages:
1. The rotating speed is low (generally 20r/min~90r/min), the mechanical wear is small, and cavitation will not occur.
2. The flow channel is wide and can transport water containing solid matter.
3. The pump body structure is half-open, and the operation inside the pump can be observed.
4. The suction side flow state has little impact on hydraulic performance, there are no special requirements for the suction pool, the foundation excavation depth is small, the construction of hydraulic buildings is simple, and the civil construction cost is low.

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