Centrifugal fans are widely used in industry and daily life, among which multi-stage centrifugal blowers and ordinary centrifugal fans have similarities but significant differences in multiple aspects.

Firstly, the working principle. Ordinary centrifugal fans mainly rely on high-speed rotating impellers to generate centrifugal force, which enables single-stage pressurization and transportation of gas inside the fan. After one centrifugal action, the gas is pressurized and discharged. The multi-stage centrifugal blower adopts a multi-stage impeller series connection, and the gas is compressed and pressurized step by step when passing through multiple impellers in sequence, which can obtain higher pressure output and meet the requirements for use in some high-pressure scenarios.

Next are pressure and flow performance. Ordinary centrifugal fans generally have relatively low pressure and high flow rate, making them suitable for ventilation, general conveying, and other scenarios, such as factory ventilation and air supply systems in ordinary buildings. Multi stage centrifugal blowers, due to their multi-stage pressurization characteristics, can provide high flow rates while obtaining high pressure. They are commonly used in applications such as sewage treatment and pneumatic conveying that require high-pressure gas push. For example, in the aeration process of sewage treatment plants, multi-stage centrifugal blowers can stably provide high-pressure gas to meet the oxygen demand of microorganisms.

Furthermore, there is the complexity of the structure. The structure of multi-stage centrifugal blowers is more complex because multiple impellers, intermediate cooling devices, etc. need to be designed to ensure good working condition and stability at all levels. This makes its manufacturing, installation, and maintenance requirements higher, and the cost relatively higher. However, the structure of ordinary centrifugal fans is relatively simple, and the manufacturing and maintenance costs are relatively low.

Finally, it is about operational stability and efficiency. In terms of operational stability, ordinary centrifugal fans have a simple structure and relatively stable operation, but their efficiency is usually lower than that of multi-stage centrifugal blowers. Although the multi-stage centrifugal blower has a complex structure, it can achieve high efficiency under suitable working conditions through reasonable design and optimization, especially when high pressure and large flow demand are present.

In short, multi-stage centrifugal blowers and ordinary centrifugal blowers each have their own characteristics, and it is particularly important to choose the appropriate blower according to different usage scenarios and needs.