The multi-stage centrifugal fan with welded structure is a core blower equipment designed specifically for high-pressure air supply scenarios in the industrial field. The core components are manufactured using welding technology and compress gas step by step through multiple sets of impellers connected in series. Compared with single-stage fans, it can output higher air pressure and is widely suitable for various high resistance industrial conditions.

?? Core structure and working principle

Multi stage impeller series design: Multiple sets of impellers are installed on the main shaft, and the gas is gradually accelerated and expanded through each stage of impeller. It is guided into the next stage of impeller through a reflux device, ultimately achieving high-pressure output.

Welded casing: Adopting integral or semi open welded steel structure, the semi open structure is convenient for internal maintenance and repair. Compared with cast iron casing, it has higher strength and stronger impact resistance.

Precision dynamic balancing system: All impellers undergo dual verification of static balance and dynamic balance, and the operating vibration speed can be controlled within ≤ 4.0mm/s, with excellent long-term stability.

Supporting auxiliary structure: Standard muffler reduces noise, supports oil-free lubrication design, bearing life can exceed 2 years, and some high-pressure models integrate air-cooled/water-cooled cooling systems.

?? Key technical parameters

|Parameter Category | Typical Range | Description|

|Airflow | 3800-220000 m 3/h | Can cover ventilation needs from small workshops to large industrial systems|

|Full pressure | 190-10000 Pa | Gradual compression characteristics enable it to easily overcome high resistance pipeline systems|

|Power | 0.75-500 kW | Match different wind pressure and air volume conditions as needed, support high-efficiency and energy-saving motor configuration|

|Speed | 1450-2950 r/min | High speed models can further increase the upper limit of pressure output|

|Working temperature | ≤ 80 ℃ (normal temperature type) | High temperature customized model can withstand 250 ℃ flue gas working conditions|

|Noise | 65-90 dB (A) | After matching with a muffler, it can meet the noise control standards of industrial plants|

?? Mainstream application scenarios

General industrial scenarios: ventilation and dust removal in factories, mines, and tunnels, as well as auxiliary air supply in industrial boilers, are the preferred equipment for high resistance ventilation systems.

Environmental water treatment scenario: providing high-pressure air for sewage treatment aeration tanks, which runs more smoothly and has a longer maintenance cycle compared to Roots blowers.

Chemical and metallurgical scenarios: Customizable anti-corrosion/high-temperature welding structures, capable of transporting corrosive gases and high-temperature flue gases, suitable for conditions such as reactor pressurization and smelting furnace air supply.

Special customization scenario: After installing explosion-proof sealing structure, it can be used for transporting flammable and explosive gases; After wear-resistant treatment on the inner wall, it can be adapted to high dust material pneumatic conveying scenarios.

?? Selection and maintenance points

Core logic of selection: Firstly, match the air volume and pressure according to the system pipeline resistance curve, reserve a safety margin of 10-15%, and select the welding structure version of the corresponding material based on the temperature, corrosiveness, and dust content of the medium.

Daily maintenance focus: Regularly inspect the welding parts of the casing for fatigue cracks, promptly clean the surface dust of the impeller to avoid damaging the dynamic balance, replace the bearing lubricating oil periodically, and monitor the changes in operating vibration and noise in real time.

Local procurement reference: Mainstream suppliers in Shandong include Shandong Kaihong Fan, Shandong Zhangqiu Blower, Linyi Ruidian Environmental Protection, etc. The basic conventional model price is about 3000-20000 yuan, and the high-pressure special customized model price can reach 20000-100000 yuan.

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.

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