TECHNICAL ADVANTAGES

Geographical Advantages

Technical Advantages

Testing Center

Service Advantages

Technical Advantages

Our high wear-resistant self-balancing multistage centrifugal pumps adopt heavy-duty design concepts.

We fully analyze standard multistage pump structures, medium impacts, pump performance and operating features.

We use velocity coefficient method, similarity design method and other theories to optimize hydraulic performance.

3D software is applied to analyze pressure bearing capacity and wall thickness of core parts, to ensure rational design.

We complete overall structural design and make calculations & upgrades for:

  • 　Shaft diameter
  • 　Bearing selection
  • 　Bearing sealing structure

The strength and rigidity of rotor parts are greatly improved.

The pumps can stably work under complex working conditions with unstable medium density.

Our self-balancing multistage slurry pumps have been put into field operation.

Field feedback shows stable, fault-free operation and extended service life.

Materials & Heat Treatment of Key Parts: Interstage Sealing Unit

　　1.  Structure & Functions of Interstage Sealing Unit

　　The interstage sealing unit is a core component of multistage centrifugal pumps.

　　It consists of diffuser, stage casing, impeller, wear ring and diffuser sleeve.

　　Functions of each part are listed below:

　　Diffuser

　　Installed between suction section and secondary suction section.

　　It guides incoming fluid to impeller blades.

　　Its shape and quantity directly affect fluid speed, flow direction and overall unit efficiency.

　　Stage Casing

　　Placed between impeller and wear ring.

　　It supports the impeller and diffuser sleeve.

　　Clearance formed with wear ring reduces medium leakage.

　　Impeller

　　The core working part of centrifugal pumps.

　　Its rotation accelerates fluid and converts kinetic energy into pressure energy.

　　Located between stage casing and wear ring in the sealing unit.

　　Its shape, size, blade number and angle decide fluid speed, flow rate and pressure.

　　Wear Ring

　　Set between impeller and diffuser sleeve.

　　It separates high-pressure and low-pressure fluid to stop leakage.

　　Its quality and sealing performance directly affect pump efficiency and reliability.

　　Diffuser Sleeve

　　Positioned between impeller and stage casing.

　　Clearances with stage casing and wear ring cut down leakage flow.

　　Summary

　　All parts of the interstage sealing unit work together.

　　They adjust fluid speed, flow direction and pressure to boost pump performance.

　　During design and production, all component parameters must match each other.

　　This realizes high efficiency and long service life of the centrifugal pump.

 

 

　　2. Solutions to Prevent Leakage & Backflow for Energy Saving

　　Three control measures isolate fluid between impeller stages, avoid leakage and backflow, and save energy:

　　(1) High Wear-resistant Materials

　　Core sealing parts (impeller, wear ring, diffuser sleeve) use high wear-resistant raw materials.

　　Advantages:

  • 　Longer service life of sealing components
  • 　Less frequent maintenance and replacement
  • 　Higher reliability and operating efficiency of pumps

　　(2) Strict Manufacturing Precision Standards

　　High machining accuracy guarantees reliable sealing:

  • 　Impeller: Grade Q2 per GB/T3216-2005
  • 　Wear ring & diffuser sleeve: Grade IT6 per GB/T1804-2000

　　High fitting accuracy minimizes leakage and backflow risks.

　　(3) Precise Control of Assembly Clearance

　　Tight clearance limits reduce fluid leakage through gaps:

  • 　Clearance between impeller and wear ring: ≤0.5 mm
  • 　Clearance between diffuser and diffuser sleeve: ≤0.5 mm

　　This effectively cuts gap leakage and backflow between all fitted parts.

 

Part name

Peer Manufacturing Process

Hardness Achieved by Peers

Wear Resistance of Peer Products

Hardness Achieved by Our Process

Wear Resistance of Our Products

Wear Ring, Diffuser Sleeve

Larger sealing clearance

<HRC55

 

Low hardness, poor wear resistance

≥HRC65

Superior mechanical performance vs competitors

Impeller

Larger sealing clearance

<HRC70

 

Low hardness, poor wear resistance

≥HRC75

 

Superior mechanical performance vs competitors

Throttling device

Larger sealing clearance

<HRC70

Low hardness, poor wear resistance

≥HRC75

 

Superior mechanical performance vs competitors