The screw pump belongs to the positive displacement rotor pump, which sucks and discharges the liquid by the displacement of several sealing cavities formed by the screw tooth shape in the pump and the pump sleeve. A screw pump without a theoretical leakage channel between two adjacent sealed cavities in a screw pump is called a strictly sealed screw pump, otherwise it is a non-strictly sealed screw pump.

The current practical application and relevant data show that the screw pump has a wide range of applications. It is characterized by stable flow, small pressure pulsation, self-priming ability, low noise, high efficiency, long life, small size and reliable operation. The outstanding advantage is that no eddy current is formed when the medium is transported, and various media with a wide range of viscosity can be transported. Mixed transport, solid-liquid mixed transport. It is widely used in offshore platform engineering, petrochemical, shipping, electric power, mechanical hydraulic system, food, paper, sugar and sewage oil treatment and other industrial sectors. In the words of the sales manager of Botou Taibang Pump and Valve Manufacturing Co., Ltd.: "There is no medium in the world that cannot be transported by a screw pump."

It is said that the screw pump can transport any medium. Of course, it is not that a certain type of screw pump can transport all media, but different types of screw pumps can be selected according to the characteristics of the medium and the requirements of performance parameters. Screw pumps are usually divided into single screw pumps, double screw pumps and triple screw pumps according to the number of screws. benefit or meet a special requirement.