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2025
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What is the working principle of a screw pump?
Screw pumps are positive displacement rotary pumps. Their core operating principle relies on the meshing between the screw and the pump housing, as well as between the screws themselves, to form continuous sealed chambers.
Screw pumps are positive displacement rotary pumps. Their core operating principle relies on the meshing between the screw and the pump housing, as well as between the screws themselves, to form continuous sealed chambers. The movement of these chambers enables the suction and discharge of the medium.
Depending on the number of screws, the operating principle varies slightly and can be categorized into three types:
Single-Screw Pump Principle
A single-screw pump consists of an eccentric helical rotor and a fixed elastic stator.
As the rotor rotates within the stator, the meshing line between them forms a series of sealed chambers.
With the rotor's rotation, these chambers move axially along the pump body from the suction end to the discharge end.
Chambers continuously form and draw in the medium at the suction end, while simultaneously compressing and discharging the medium at the discharge end, thereby achieving stable medium conveyance.
Characteristics: Capable of transporting viscous media containing solid particles or fibers, strong self-priming capability, and pulsation-free flow.
Working Principle of Twin-Screw Pumps
Twin-screw pumps incorporate two intermeshing screws rotating in opposite directions, with a slight clearance maintained between the screws and the pump housing.
The motor drives the drive screw to rotate, which in turn drives the driven screw to rotate synchronously via a synchronous gear.
The meshing profiles of the screws and the inner wall of the pump body form sealed chambers. Once sucked in, the medium is enclosed within these chambers.
As the chambers rotate with the screws, they move toward the discharge end. Upon reaching the discharge end, the meshing action of the screws reduces the chamber volume, forcing the medium out under pressure.
Features: Suitable for conveying poorly lubricating media containing fine particles, with low operational noise and stable pressure.
Working Principle of Three-Screw Pumps
A three-screw pump features one drive screw and two symmetrically positioned driven screws, with the tooth profiles of all three screws meshing.
When the drive screw rotates, it drives the two driven screws to rotate in the same direction. The meshing clearance between the screws and the pump body forms sealed chambers.
After entering the chamber from the suction end, the medium is pushed toward the discharge end by the rotating screws. The chamber volume gradually decreases, increasing the medium pressure.
Features: Primarily transports clean, lubricating media (e.g., lubricating oil, fuel oil). High efficiency with minimal pulsation.
Common Series of Wastewater Pumps and Their Core Features
Sewage pumps are centrifugal pumps specifically designed for conveying wastewater, sewage, sludge, and other media containing solid particles, fibers, and suspended solids.
What are the common faults of multistage centrifugal pumps?
Multi-stage centrifugal pumps have a more complex structure than single-stage centrifugal pumps. Failures often center on axial force imbalance, inter-stage leakage, and abnormal hydraulic performance.
The application scenarios for single-stage centrifugal pumps and multistage centrifugal pumps are primarily determined by head requirements and flow characteristics.
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