Why do the two screws of a twin-screw pump need to maintain a strict meshing clearance during operation?

2025-10-13 09:41:08

A twin-screw pump requires a strict meshing clearance for several key reasons:

Ensuring sealing: A twin-screw pump operates on a pair of intermeshing, non-contacting screws. This design ensures a constant volume in the sealed chamber between the screws. As the screws rotate, the medium is drawn in and delivered to the center of the pump body, where it is mixed and delivered to the pump outlet, achieving pumping. A strict meshing clearance prevents leakage and ensures efficient and safe pumping.

Preventing mechanical wear: Excessive meshing clearance can cause collision and friction between the screws or between the screw and the stator, increasing mechanical wear and shortening the pump's life. Maintaining a strict meshing clearance reduces this unnecessary wear and improves pump durability.

Maintaining stable pumping pressure: The size of the meshing clearance directly affects the stability of pumping pressure and pumping efficiency. Excessive clearance can lead to pressure fluctuations and reduced efficiency, while too little clearance can cause mechanical failure. Therefore, maintaining a tight meshing clearance helps maintain stable pumping pressure and high pumping efficiency.

Adapting to Complex Operating Conditions: In some specialized applications, such as pumping high-viscosity, non-lubricating liquids or multiphase media containing minute solid impurities, a tight meshing clearance ensures proper pumping and delivery. Furthermore, with the continuous advancement of materials science and manufacturing technology, the rotor structure of twin-screw pumps is constantly being improved and optimized to accommodate increasingly complex operating conditions.