Advantages, disadvantages and characteristics of screw pump performance:
1, performance advantages: 1) a wide range of pressure and flow. The pressure is about 3.4-340 kgf/cm 2 and the flow rate can reach 18600 cm3/min. 2) The type and viscosity range of the transporting liquid is wide; 3) Because the inertial force of the rotating parts in the pump is low, the high speed can be used. 4) good suction performance, self-priming ability; 5) uniform flow, low vibration, low noise; 6) less sensitive to incoming gases and dirt than other rotary pumps; 7) solid structure, installation Easy to maintain.
2, performance shortcomings: the processing and assembly requirements of the screw is higher; the performance of the pump is sensitive to the viscosity change of the liquid.
3, the characteristics of the screw pump:
★ The spiral sealing line that contacts the stator and the rotor completely separates the income chamber from the discharge chamber, so that the pump has the function of blocking the valve.
★ It can realize multi-phase mixing of liquid, gas and solid.
★The volume does not change when the fluid in the pump flows, and there is no turbulent agitation and pulse.
★The volume chamber formed by the elastic stator can effectively reduce the wear when conveying the solid particle-containing medium.
★ The input medium viscosity can reach 50,000Mpa·s and the solid content can reach 50%.
★ Flow rate is proportional to the speed, and the speed can be adjusted automatically. The pump can be delivered in both forward and reverse directions.
Screw pumps have the following advantages:
1. Compared with the centrifugal pump, the screw pump does not need to be installed. The flow rate of the valve is stable and linear.
2. Compared with the plunger pump, the screw pump has strong self-priming ability and strong suction height.
3. Compared with the diaphragm pump, the screw pump can transport various mixed impurities containing gas and solid particles or fibers, and can also transport various corrosive substances.
4. Compared with gears, screw pumps can transport high viscosity materials.
5. Unlike the plunger pump, diaphragm pump and gear pump, the screw pump can be used for filling and metering of medicaments.