Panoramic analysis of multi-stage centrifugal blower technology (2026)
1、 Core Definition and Structural Principles
Multi stage centrifugal blower is a rotary fluid machinery that compresses gas step by step through multiple series connected impellers to achieve medium and high pressure gas transportation. Its working principle is based on the conversion of kinetic energy to pressure energy: the gas enters the first stage impeller axially, accelerates radially under the action of centrifugal force, is reduced and pressurized by the diffuser, and then introduced into the next stage impeller through the reflux device. Repeat this process, and the final output pressure can reach 15 kPa to 0.2 MPa.
Core structure composition:
Rotor system: multi-stage impeller (aluminum alloy or high-strength alloy steel), main shaft (carbon steel/alloy steel), balance disk (to counteract axial thrust)
Chassis system: graded riveting and welding structure, inner wall can be coated with epoxy resin for corrosion protection, horizontal sectional design for easy maintenance
Sealing system: labyrinth seal+carbon ring seal combination, achieving oil-free and low leakage operation
Transmission mode: direct or belt transmission, speed range 2000-5000 rpm
Supporting accessories: imported butterfly valve, muffler, filter, control cabinet
This device is suitable for continuous operation for more than 1 year, with noise control of ≤ 85 dB (A). It is widely used in scenarios such as sewage treatment aeration, cement pneumatic conveying, steel blast furnace blowing, and chemical gas pressurization.
2、 Performance parameters and industry standards
|Parameter category | Typical range | Standard basis|
|Flow rate | 15-500 m 3/min | GB/T 28381-2022|
|Export pressure | 10-100 kPa (gauge pressure), high pressure type up to 0.2 MPa | JB/T 3165-1999|
|Motor power | 7.5 kW -1200 kW | GB/T 28381-2022|
|Energy efficiency level | Level 1 ≥ 82%; Level 3 ≥ 75% | GB/T 28381-2022|
|Operating noise | ≤ 85 dB (A) | ISO 10816-3|
GB/T 28381-2022 "Minimum Allowable Values and Energy Efficiency Grades for Blowers" is a mandatory standard in China, which for the first time includes magnetic levitation centrifugal blowers in the energy efficiency evaluation system and specifies that their overall efficiency should be ≥ 87%.
3、 Comparison between mainstream brands and technologies
|Type | Representative Brand | Technical Features | Applicable Scenarios | Advantages|
|Traditional multi-stage centrifugation | Shaangu, Shengu, Sabert, Xinjunze | Mechanical bearings, gear transmission, direct drive/belt | Sewage treatment, power plant desulfurization, cement plant | Low cost, simple maintenance, high reliability|
|Magnetic levitation centrifuge | Aizhen Machinery, Jiafu Technology, CRRC China | Magnetic levitation bearings, permanent magnet synchronous motors, contactless transmission | Sewage treatment standards improvement, pharmaceuticals, food industry | Energy saving of 30%+, noise ≤ 75dB, lifespan over 10 years, lubrication free|
|Imported high-end | Atlas Copco (ZM), American NICO, American Walton | Three dimensional flow impeller, ATEX explosion-proof certification, intelligent control | petrochemical, coal chemical, hydrogen cycle | high reliability, long cycle operation, full condition adaptation|
Compared with Roots blowers, multi-stage centrifugal blowers have higher efficiency and lower energy consumption in high flow (>100 m 3/min) and medium high pressure (>50 kPa) scenarios, but require higher initial investment; Roots machines have a price advantage in low flow and low-cost scenarios.
4、 Technological development trend: towards "zero contact, intelligence"
From 2025 to 2026, multi-stage centrifugal blowers are accelerating towards magnetic levitation+intelligent control upgrade:
Magnetic levitation bearing technology: Eliminating mechanical bearings and lubricating oil systems, achieving "zero friction" transmission, extending bearing life to over 100000 hours, and reducing maintenance costs by 80%.
Permanent magnet synchronous motor+frequency conversion control: The overall efficiency of the machine reaches 97% (motor)+98% (frequency converter), with a comprehensive efficiency of over 87%, and the energy-saving rate generally reaches 22-30%.
Intelligent operation and maintenance system: integrating PLC, wireless sensing, AI predictive maintenance, realizing remote monitoring, fault warning, and automatic voltage regulation.
Application scenario deepening: In SBR process sewage treatment plants, magnetic levitation fans can achieve unlimited start and stop, precise matching of air volume with dissolved oxygen, and meet standards even without soundproof covers.
Taking the working condition of 100 m 3/min and 65 kPa as an example, the operating power of the magnetic levitation fan is 116 kW, which saves 112 MWh annually compared to the traditional model of 150 kW, equivalent to reducing 651 tons of CO ? emissions.
5、 Chinese Market and Local Supply (Linyi, Shandong)
Although there are no large-scale fan manufacturing enterprises in Linyi, manufacturers such as Shandong Zhanggu (Zibo), Aizhen Machinery (Zhejiang), and Xinjunze (Cangzhou) cover the Linyi market through a national distribution network, and their products are widely used in local sewage treatment plants, printing and dyeing enterprises, and building materials industries.
The following are the actual models on sale on the Love Procurement platform (February 2026 data):
Note: The price range is from 1988 yuan (small low-pressure fan) to 50000 yuan (magnetic levitation high-pressure model), and users can choose according to flow rate, pressure, and anti-corrosion needs. It is recommended to prioritize products that support 380V variable frequency control, IP54 protection, and a 2-year warranty for the entire machine.
6、 Selection and application suggestions
|Application scenarios | Recommended models | Key parameter requirements|
|Municipal sewage treatment aeration | Magnetic levitation centrifugal blower | Flow rate: 50-200 m 3/min, pressure: 50-70 kPa, noise ≤ 75dB|
|Cement plant pneumatic conveying | Traditional multi-stage centrifugal blower | Flow rate: 100-300 m 3/min, pressure: 80-120 kPa, dust resistance|
|Blast furnace blast in steel plant | Imported high-end multi-stage centrifugal | Pressure ≥ 150 kPa, explosion-proof certification, continuous operation ≥ 5 years|
|Small industrial ventilation | Multi blade centrifugal fan | Power ≤ 10 kW, voltage 220V, low noise|
? Key selection points:
Priority confirmation of design operating points (flow rate, pressure)
Choose energy-efficient level 1 products, with significant long-term energy-saving returns
It is recommended to use a combination of magnetic levitation and frequency conversion for sewage treatment projects to achieve intelligent pressure regulation
Reserve maintenance access during installation to ensure flexible connection between the fan and the pipeline
