Sand suction pump (also known as sand pump, slurry pump) is core equipment for river dredging and mine tailings transportation. It is essentially a centrifugal impurity pump, whose core task is to efficiently transport mixed media containing solid particles (sand, gravel). Below is an in-depth analysis of its working principle.

Core Principle — How Centrifugal Force "Throws" Sand

The working process of a sand suction pump is based on the principle of centrifugal force and can be broken down into four key steps:

Power Start: The motor (or diesel engine) drives the impeller to rotate at high speed inside the pump casing via the pump shaft.

Vacuum Generation: As the impeller rotates, the medium between the blades is thrown outward, creating a low-pressure area (vacuum) at the center inlet of the impeller.

Mixture Intake: Under atmospheric pressure, the sand-water mixture is "pushed" into the pump through the suction pipe, filling the vacuum at the center.

Kinetic Energy Conversion: The sand particles are accelerated by the impeller and thrown into the volute (pump casing). The flow channel design of the volute converts velocity energy into pressure energy, ultimately discharging the mixture at high pressure.

Simple Analogy: Just like spinning a bucket tied to a rope rapidly with your hand — the water (sand) inside the bucket is pressed tightly against the bottom by centrifugal force and thrown out. The impeller of a sand suction pump is that "rapidly spinning bucket."