Working Principle of Under-liquid Slurry Pump and Its Area with Ordinary Centrifugal Pumps

Compared with ordinary centrifugal pumps, there are significant differences in the sub-liquid slurry pumps in many aspects. Structurally, the liquid slurry pump is installed under the liquid slurry, and the pump body is partially immersed in the slurry pool, reducing the floor area and starting by itself without filling the pump; ordinary centrifugal pumps are usually horizontal or vertically installed on the ground, and before starting, they often need to fill the pump to discharge air. In terms of material, the overflow components of the under-liquid slurry pump, such as impellers, pump shells, etc., need to withstand the erosion and wear and corrosion-resistant materials of solid particles in the slurry, so they are mostly made of wear-resistant and corrosion-resistant materials such as high-chromium alloys and wear-resistant rubbers; the media conveyed by ordinary centrifugal pumps are relatively clean, and the overflow components are generally made of ordinary cast iron or stainless steel.

In terms of application scenarios, under-liquid slurry pumps are mainly used in mining, metallurgy, electricity and other industries, and transport slurry containing a large number of solid particles, high concentration and high hardness; ordinary centrifugal pumps are suitable for transporting clean water, low viscosity liquids or liquids with fewer impurities, such as urban water supply, air-conditioning circulating water systems, etc.

In terms of performance characteristics, under-liquid slurry pump pays more attention to wear resistance and passability. During design, the gap between the impeller and the pump casing will be increased to ensure the smooth passage of larger particles, but this also leads to its relatively low efficiency; ordinary centrifugal pumps pursue higher efficiency and stable performance, and focus more on optimizing fluid mechanical properties in design.

The unique working principle of the under-liquid slurry pump enables it to adapt to harsh working conditions, and the differences in structure, material, application scenarios and performance characteristics from ordinary centrifugal pumps make it an indispensable equipment for conveying slurry in specific industrial fields.