Multi stage centrifugal fan is an industrial equipment that achieves efficient gas compression through multi-stage impeller series connection,widely used in fields such as sewage treatment,metallurgical smelting,chemical gas production,etc.The following are its core features and technical analysis:
1、Structure and Working Principle
Multi stage compression design
Adopting a 3-10 stage impeller series structure,the gas pressure increases by 15-30kPa after passing through each stage of the impeller,and the final wind pressure can reach 0.2MPa.The impeller adopts a backward design,with a conical front disk to reduce intake vortex,and a balance disk structure to reduce axial thrust.
Core components
Rotor system:The main shaft is made of carbon steel/alloy steel,and the impeller material includes aluminum alloy(low-pressure section)and high-strength alloy steel(high-pressure section).
Sealing system:labyrinth seal+carbon ring seal combination,leakage rate<1%.
Chassis:Graded riveting and welding structure,with epoxy resin coating on the inner wall for corrosion prevention,and a horizontal sectional design for easy maintenance.
2、Performance parameters
Typical application scenarios of indicator parameter range
Wind pressure 15kPa-0.2MPa blast furnace air supply and aeration system
Flow rate of 15-500m³/min for chemical gasification and mining flotation
Efficiency 78%-85%(Three element flow impeller design)for wastewater treatment
Noise≤85dB(A)(with muffler)Urban sewage treatment plant
3、Application Fields
Environmental protection field:sewage treatment aeration(such as A²/O process requiring 0.05MPa pressure)
Metallurgical industry:Blast furnace blowing(pressure 0.15-0.2MPa)
Chemical industry:Gas transportation(requiring oil-free design)
4、Selection and maintenance
Key selection points:Select the number of impeller stages based on gas flow rate and pressure requirements,and stainless steel impellers should be selected for corrosive gases.
Maintenance cycle:The bearing grease is replaced every 2 years,and the labyrinth seal is inspected every 5000 hours.
5、Market supply
Zhangqiu in Shandong and Guangshui in Hubei are the main production areas,with a price range of 6000-160000 yuan per unit(such as D400 model costing about 200000 yuan).The price of imported models(such as Hoffman&Lamson)can reach 730000 yuan.
