A multi-stage centrifugal blower is an industrial fluid machinery that uses multi-stage impellers in series to achieve gas pressure increase step by step. It is widely used in industrial scenarios with medium to high pressure, large air volume, and continuous operation. Its core advantage lies in achieving an outlet pressure of up to 10-100 kPa at lower speeds (2000-5000 rpm), which is safer, more efficient, and easier to maintain compared to single-stage high-speed fans.
Core structure composition
Multi stage impeller system
Composed of 3-6 stages (common) of three element streamlined impellers in series, each stage of impeller accelerates the gas and introduces it into the diffuser, converting kinetic energy into static pressure energy, and then guiding it into the next stage for further compression through the reflux device, achieving a stepped pressure increase.
Maze seal
Non contact labyrinth seals are installed at the inlet, between stages, and at both ends of the casing of each impeller stage, effectively preventing high-pressure gas leakage, ensuring efficiency and operational stability, without wear and maintenance.
Diffuser and snail shell
The diffuser decelerates the high-speed airflow, further increasing the static pressure; The snail shell efficiently collects gases from all levels of outlets and directs them towards the exhaust port, reducing vortex losses.
Main shaft and bearing system
The spindle is made of high-strength alloy steel, equipped with rolling or sliding bearings, supporting grease lubrication or pressure oil supply. The bearing life exceeds 3 years, the amplitude is ≤ 0.04mm, and the operation is stable.
Transmission and cooling
The transmission methods include coupling direct drive, belt drive, or gearbox drive; The exhaust end is equipped with air-cooled or water-cooled bearing seats to cope with compression heat accumulation and extend equipment life.
Key performance parameters
|Parameter category | Typical range | Standard basis|
|Airflow | 15-500 m 3/min | National standard GB/T 13275-2021|
|Export pressure | 10-100 kPa (gauge pressure); Partially reaching 0.2 MPa | JB/T 10563-2020|
|Motor power | 7.5-800 kW | Matching with air volume and pressure|
|Rotational speed | 2000-5000 rpm | Low speed design to reduce vibration and noise|
|Efficiency | 75% -78% | Three element flow impeller+optimized flow channel design|
|Noise | ≤ 85 dB (A) | High frequency noise is easily isolated by obstacles|
|Continuous operation |>1 year | Oil free operation, long maintenance free cycle|
Note: Model naming example: D300-31-1.5=single suction, level 3, design number 1, outlet pressure of 1.5 kg/cm 2 (≈ 49 kPa), air volume of 300 m 3/min.
Typical application scenarios
Sewage treatment aeration: mainstream application, providing stable airflow to the aeration tank with a pressure requirement of 49-98 kPa, replacing traditional Roots blowers and saving more than 30% energy.
Chemical oxidation reaction: compressed air or oxygen is supplied to the reaction vessel, and corrosion-resistant materials (such as stainless steel lining) are optional.
Metallurgical blast furnace blower: provides combustion supporting air for ironmaking blast furnaces, with stable pressure and support for high temperature environments (inlet temperature ≤ 40 ℃).
Electric power desulfurization and denitrification: used for oxidation fans in flue gas desulfurization systems to ensure SO ? conversion efficiency.
Mining flotation and coal washing: providing the required airflow for pneumatic separation, suitable for dust and humid environments.
Vacuum system matching: Some models can operate in reverse and are used for vacuuming, with a vacuum degree of up to -800 mmH ? O.
Note: The price is the reference price for the single machine market and does not include installation, control system, and transportation. Industrial grade equipment (such as C series) requires professional selection, and it is recommended to provide operating parameters (air volume, pressure, medium, temperature) for customization by the manufacturer.
Shandong Ruidian Environmental Protection Technology Co., Ltd. is located in the high-end equipment manufacturing base of Luozhuang District, Linyi City. It is a modern enterprise that focuses on the research and development, design, production, and manufacturing of multi-stage centrifugal blowers, centrifugal vacuum pumps, Roots blowers, pneumatic conveying systems, and soil remediation integrated special equipment. Its telephone number is 13287120066.
The various information published on this website is for reference only and does not represent the position or viewpoint of this website. It does not constitute any investment, medical, legal or decision-making advice. Any actions taken by users based on the information on this website are at their own risk, and this website does not assume any direct or indirect responsibility. This website does not assume any responsibility for the authenticity, accuracy, completeness, or legality of its content.
