Multistage Centrifugal Pump

Product Introduction

Series C casting multistage centrifugal pump, based on technology of welding multistage low speed centrifugal, designed and developed by Shandong Zhangqiu Blower CO., is new generation high efficiency product, gathering some patented technologies and longtime blower experiences of design and fabrication, which can satisfy users' appeal.

Key Features:

• Applying optimizing design to the impeller and the blower casings to minimize the flow loss.

• Applying Optimization Method of Meridional Channel and Blade in 3 D Impeller to get the high aerodynamic efficiency.

• Applying sealing diversion technology to the inlet of the impeller to improve the inlet flow ability.

• Applying aerofoil type reflux blade technology to reduce the energy loss.

• Applying flow analysis technique to optimize the blower performance and improve the stage efficiency to above 78%.

• Applying 3D Flow Impellers to some models of C blowers.

• Applying strict dynamic balance to get low vibration, low noise, and high reliability.

• Applying advanced blower structure design to make an easy installation, operation and maintenance.

Product components

The multistage centrifugal blower consists of a stator, rotor, driving device, and other components. It features one suction inlet and two supports. The rotor is equipped with multi-stage impellers. The motor and bloer can be installed independently or mounted on the same common base according to customer requirements (to be specified before order). The motor and blower are directly connected via a coupling (mini-type blowers use belt drive). When viewed from the motor tail end (shaft extension for mini-type models), the blower rotates clockwise.

Stator
The stator features a vertically split structure, comprising an inlet chamber, intermediate casing, and discharge scroll case. These components form the gas flow passages and are bolted together. Made from high-quality cast iron using rosin mold casting, each part undergoes strict annealing treatment to minimize distortion. The stator ensures high precision and coaxiality, providing stable support for the rotor assembly.

Rotor
The rotor consists of impellers, a main shaft, shaft sleeves, half-couplings, and other components. The main shaft is manufactured from high-quality carbon steel and undergoes quenching and tempering treatment. The fully assembled rotor is dynamically balanced to ensure smooth and reliable operation.

Impeller
Depending on requirements, either cast or welded impellers are used. Cast impellers are precision-cast from high-strength aluminum alloy, while welded impellers are fabricated from hubs, covers, and vanes. During welding, multiple heat treatments are applied to eliminate residual stress. Each impeller is precision-machined, dynamically balanced, and undergoes high-speed rotation testing.

Bearing Housing
The bearing housing is made of cast iron and installed on both sides of the blower for easy bearing installation and replacement. It includes thermal and vibration monitoring holes. Different configurations are available based on customer needs. Standard blowers feature air-cooled bearing housings, with water-cooled options available upon request.

Bearing and Lubrication
SKF bearings are used, with a design life of 100,000 hours. Lubrication is provided by high-grade grease or oil, depending on the application.

Seal
Multiple non-contact labyrinth seals are installed at the main shaft ends and between each impeller stage, ensuring excellent sealing performance with minimal leakage.

Oil Tank
Standard blowers are equipped with a large oil tank to reduce oil temperature without water cooling, extending the service life of lubricants and bearings. The tank uses a dual-chamber splash lubrication system to ensure sufficient oil supply while preventing foaming and leakage. An oil level indicator and vent are mounted on the tank.

Shaft Seal
Shaft seals located on both sides of the blower can be replaced without disassembling the unit. Standard blowers (for air) use labyrinth seals, while special gas blowers employ carbon ring seals.

Drive
Mini-type blowers use belt drive, while other models are equipped with flexible pin couplings or diaphragm couplings.

Application Area

• Water Treatment

• Wastewater Treatment

• Biogas Recovery

• Air Knife Dry

• Floatation and Mineral Beneficiation

• Fluid and Piscina Oxygenation

• Process Gas Conveying

• Papermaking and Printing

• Air Firing(Desulphurization,Carbon Black,Blast Fumace Process and so on)