I. Transporting Liquids Like Turning a Screw
The core principle of a screw pump is like a rotating screw advancing in a nut: when the motor drives the screw to rotate, the sealed chambers formed by the helical groove and the pump casing continuously move from the suction port to the discharge port, steadily pushing the liquid forward like a conveyor belt. Single-screw pumps use an elastic seal between the rubber stator and the metal rotor, while double-screw pumps rely on the precise meshing of the threads to propel the fluid. This design allows them to quietly transport liquids containing particles or viscous fluids.
II. The Transformers of Single and Double Screw Pumps
1. Single-screw pump: Suitable for transporting sewage and sludge containing solid particles; the helical rubber bushing can tolerate impurities with a diameter of less than 5mm.
2. Double-screw pump: More excellent at handling high-viscosity oils; the two screws mesh together to form a more stable conveying chamber.
3. Three-screw pump: Designed specifically for high-pressure lubricating oil; the multi-stage sealing structure allows pressures to reach over 40 bar.
III. Little-Known Facts to Extend Pump Lifespan
- Running dry for 5 minutes = shortening its lifespan by half a year! Dry running will instantly burn out the rubber stator.
- Reverse installation = halved flow rate! Pay attention to the direction of the inlet and outlet arrows.
- Drain the pump when not in use during winter; freezing and expansion will crack the pump body.
- New pumps need a break-in period for the first 100 hours, avoiding full-load operation.
