The impeller of the water pump is made of materials such as cast iron.
The blades on the impeller play a major role. The shape and size of the impeller are closely related to the performance of the water pump.
The impeller of the water pump can generally be divided into two types: single suction type and double suction type. The single suction type impeller sucks water from one side, and small-flow water pumps mostly adopt this type. The double suction type impeller sucks water from both sides, and large-flow water pumps all use this type of impeller.

Product structure

The impeller of the slurry pump is installed on the pump shaft and is the core component that does work on the slurry through high-speed rotation. Its main composition and classification are as follows:
Main material: Commonly used is high-chromium wear-resistant alloy cast iron, such as Cr15Mo3, Cr26, Cr28, etc. This type of material forms (Fe,Cr)₇C₃ type carbides with high chromium content (usually >26%) to achieve high hardness, with the base hardness reaching HRC 58-65. Its wear resistance far exceeds that of ordinary materials. In specific corrosive conditions, wear-resistant rubber, polyurethane or duplex stainless steel may also be selected.
Manufacturing process: It is processed by vacuum precision casting and combined with multiple heat treatment processes such as annealing, normalizing, and tempering to optimize the microstructure, eliminate internal stress, balance hardness and toughness, and ensure that it is less prone to cracking under impact.
Structural type: According to the characteristics of the medium, it is mainly divided into three types:
Closed impeller: Both the front and rear have cover plates, the flow channel is closed, the hydraulic efficiency is high, and it is suitable for transporting finer and less wear-resistant particles.
Open impeller: There is no front cover plate, the flow channel is spacious, it is not prone to clogging, and is particularly suitable for transporting slurry containing large particles or fiber impurities.
Half-open impeller: Only the rear cover plate is present, which balances efficiency and throughput.

Forging process

Forging process - Three heat treatments: annealing, normalizing, and tempering
Annealing heat treatment Quality Control
Inspection before furnace
Normal heat treatment
Reheat heat treatment
- Inspection before and after furnace, post-furnace inspection, factory inspection
Post-furnace inspection

Application fields

Metal mines and beneficiation
Transportation of raw ore slurries, concentrates, and tailings from iron ore, copper ore, gold ore, etc.
The particles are highly hard and extremely abrasive. The preferred choice is high-chromium alloy (Cr26 or above) closed or semi-open impellers to ensure wear resistance.
Coal and washing
Transportation of coal slurry, heavy medium suspension, and coal water slurry in coal washing plants.
The medium may contain corrosive components (such as sulfides). Depending on the particle size, high-chromium alloy or wear-resistant rubber impellers can be selected.
Electric power industry
Water removal and desulfurization systems in thermal power plants for slurry circulation.
The ash and slag are highly abrasive, and the desulfurization slurry is corrosive. High-chromium alloy impellers are the mainstream choice. When corrosion is severe, duplex stainless steel can be considered.
Metallurgical and chemical industry
Transportation of high-temperature slag from steel mills, red mud from aluminum plants, and corrosive slurry from chemical plants.
It often involves high temperatures, abrasion, and corrosion. Special high-chromium alloy or heat-resistant wear-resistant alloy impellers should be selected.
Dredging and construction materials
River dredging, sand and gravel transportation, and cement plant slurry transportation.
It contains a large amount of sand and gravel. Open or semi-open high-chromium alloy impellers can better pass through large particles and prevent blockage.

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