Key Operating Points Of Screw Pump

Apr 03, 2025

Screw pump belongs to the positive displacement rotary pump, which sucks in and discharges liquid by the displacement of several sealed chambers formed by the screw teeth and pump sleeve inside the pump. Screw pumps have a wide range of applications, characterized by stable flow, small pressure pulsation, self-priming ability, low noise, high efficiency, long service life, small size, and reliable operation. The outstanding advantage is that it does not form eddies when transporting media and can transport various media with a wide viscosity range. It can transport lubricating or corrosive media of various viscosities, non Newtonian liquids of various viscosities, as well as gas-liquid mixed transport and solid-liquid mixed transport. It is widely used in industrial sectors such as offshore platform engineering, petrochemicals, shipping, power, mechanical hydraulic systems, food, paper, sugar, military, and sewage treatment.

Screw pumps are usually divided into single screw pumps, double screw pumps, triple screw pumps, and five screw pumps according to the number of screws. Each pump has its own advantages and must be selected when promoting the application of screw pumps. Only by fully utilizing their respective characteristics can we better achieve energy conservation, material saving, efficiency increase, or meet certain special requirements. The pump sleeve of a single screw pump is made of non-metallic elastic material (usually rubber), with an inner hole in the shape of a spiral groove, which forms several sealing chambers with a spiral metal screw. The metal screw undergoes eccentric rotational motion, causing the sealing chamber to shift from the low-pressure area of the pump to the high-pressure area, completing the entire process of suction, discharge, and pressure formation. In addition to general media, single screw pumps can transport suspensions and special media containing metal particles, fibers, etc. Single screw pumps are commonly used in the treatment of sewage and mud, and their working pressure is usually not high. Although traditional twin-screw pumps are not strictly sealed and have low working pressure, they can transport various media with a wide range of viscosities, non Newtonian liquids of various viscosities, as well as gas-liquid mixed transport and solid-liquid mixed transport. Therefore, various industries have great interest in it, especially the petroleum and chemical industries.