AH Slurry Pump Sleeve

The sheath is a key component in slurry pumps that directly comes into contact with the abrasive slurry. Its shape is usually conical or vane-like. According to the structure, it can be divided into single-shell pump sheath (which is directly exposed outside, such as vertical and submersible slurry pumps) and double-shell pump sheath (which has a pump casing on the outside, such as ZGB and ZJ type pumps). Its main function is to form an efficient flow passage, convert the kinetic energy of the impeller into pressure energy, and protect the main structure of the pump body from wear.

Outstanding wear resistance and impact resistance: The inner wall of the protective sleeve, especially the "flange" section near the outlet of the impeller, is the most severely worn. By using high-chromium alloy cast iron (such as Cr27, with hardness HRC ≥ 58) or special wear-resistant rubber and other materials, it can effectively resist the erosion and impact from high-concentration solid particles (with a solid content of up to 60%).
Excellent corrosion resistance: For corrosive media in industries such as chemical and metallurgy, the rubber-lined protective sleeve or special alloy protective sleeve can withstand corrosion from acids, alkalis, salts, and various organic substances, extending the service life in harsh environments.
Optimized hydraulic design and high efficiency: The precise flow channel design can reduce vortex and impact losses, ensure the smooth flow of the slurry, help maintain the hydraulic efficiency of the pump, and reduce energy consumption.
Modular design and easy maintainability: As a wear-prone component, the protective sleeve is usually designed in a modular manner, allowing for separate disassembly and replacement without the need to disassemble the entire pump body and piping, significantly reducing downtime for maintenance.

Step 1: Annealing
Objective: To eliminate the internal stress generated during the solidification process of the casting, and to homogenize the chemical composition and structure, laying a stable material foundation for subsequent processing.
Key control: Slowly heat the component to above the critical temperature, and ensure sufficient holding time at this temperature, then slowly cool it in the furnace. The precise temperature-time curve is the key to avoiding deformation and obtaining uniform softened structure.
Step 2: Normalizing
Objective: To refine and homogenize the grain structure after annealing, improve the strength, hardness and toughness of the material, and obtain better comprehensive mechanical properties.
Key control: Cool in the air at a controlled speed. The essence of this step is to obtain the ideal microstructure (such as pearlite), providing a solid foundation for the component to resist plastic deformation and initial wear.
Step 3: Tempering
Objective: To eliminate or reduce the internal stress caused by normalizing, while maintaining high hardness and strength, significantly improving the toughness, ductility and dimensional stability of the material, and preventing brittle fracture.
Key control: Heat to a specific range below the critical temperature, strictly hold for a period of time, then cool in an appropriate manner. This step is the "art" of balancing hardness and toughness, directly determining the reliability of the component under impact loads.

High-chromium alloy cast iron: Suitable for harsh working conditions with high hardness, large particles, and high erosion, such as the transportation of coarse particle tailings in mines.
Magnetic rubber: Excellent elasticity, capable of absorbing particle impacts, reducing noise. Especially suitable for fine particles, medium to low flow rates, and corrosive slurries, such as coal slime and tailings transportation. Ceramic/polymer composite materials: Possess extremely high hardness and wear resistance, suitable for ultra-high wear conditions, but have relatively weak impact resistance.

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