1. Selection of screw pump

For the selection of screw pumps, it is necessary to comprehensively consider comprehensive technical and economic indicators such as investment and operating costs of pump units and pump stations, so that it conforms to the principles of economy, safety and applicability. Specifically, there are the following aspects:

1. According to the layout of the device, terrain conditions, water level conditions, operating conditions, comparison of economic plans and other factors

2. Consider choosing horizontal and vertical. The horizontal pump is easy to disassemble and assemble,

3. It has good anti-cavitation performance, which can not only reduce the excavation depth of the pump room, but also prevent the pump from cavitation, stable operation and long service life. The pump station is built according to the selected water pump, the project investment is small, and the operation cost is low.

4. Selection steps of screw pump a. List the basic data: characteristics of the medium: medium name, specific gravity, viscosity, corrosiveness, toxicity, etc. Contained in the medium depends on the particle diameter and content of the body. Medium temperature: (°C) Required flow rate General industrial screw pumps can ignore the leakage in the pipeline system in the process flow, but the impact on the flow rate when the process changes must be considered. If the agricultural pump uses open channel water delivery, the leakage and evaporation must also be considered. Pressure: Suction sump pressure, discharge sump pressure, pressure drop in piping system (head loss). Piping system data (pipe diameter, length, type and number of pipe accessories, geometric elevation from suction tank to pressurization tank, etc.). If necessary, the device characteristic curve should also be drawn.

Second, the performance characteristics of the screw pump:

1. The suction height can reach 6 meters of water column.

2. It can rotate in two directions and convey in two directions (need to be equipped with reverse stator).

3. The installation method is flexible.

4. Smooth, stable operation, low noise, no pulsation, no shear.

5. The temperature range of the conveying medium is -20℃～+150℃.

6. The single-screw pump has few parts, compact structure, small volume, and easy maintenance. The rotor and stator are the wearing parts of the pump, and the structure is simple and easy to assemble and disassemble. The transmission can be directly driven by a coupling, or the speed can be changed by a speed-regulating motor, a V-belt, a gearbox and other devices.