In industrial production, blowers and vacuum fans are common fluid conveying equipment, but their uses and working principles differ significantly. Although multi-stage blowers and vacuum blowers are both gas conveying equipment, they have their own characteristics in structure, performance, and application scenarios. This article will provide a detailed analysis of the differences between the two, helping users choose the appropriate device based on their needs.

1、 Different working principles

1. Multi stage blower

The multi-stage blower adopts a series connection of multi-stage impellers, and the gas is compressed step by step in multiple impellers, gradually increasing the pressure. Its working principle is similar to that of a multi-stage centrifugal pump, suitable for medium and high pressure gas transportation.

Compression method: Step by step pressurization, pressure can reach tens of kPa or even higher.

Gas flow direction: Gas enters from the inlet and is compressed by multiple impellers before being discharged from the outlet.

Applicable gas: mainly used for transporting air or other neutral gases.

2. Vacuum fan

The working principle of a vacuum fan (also known as a vacuum pump) is to extract gas, reduce the pressure inside a closed space, and create a vacuum environment. Its core goal is to generate negative pressure, not boost pressure.

Extraction method: Gas is extracted through impeller rotation or volume change (such as Roots vacuum pump).

Gas flow direction: Gas enters the fan from the pumped container and is ultimately discharged into the atmosphere.

Applicable gases: can handle air, water vapor, or other non corrosive gases, and some models can handle corrosive gases.

2、 Performance parameter comparison

Multi stage blower and vacuum fan for the project

Main functions include boosting, transporting gas, vacuuming, and reducing air pressure

Pressure range: positive pressure (several kPa to tens of kPa), negative pressure (several hundred Pa to several kPa)

High flow rate in the flow range (depending on the model) and medium low flow rate (depending on the vacuum requirements)

Typical applications include pneumatic conveying, aeration, ventilation, vacuum packaging, vacuum adsorption, and vacuum drying

3、 Differences in application scenarios

1. Typical applications of multi-stage blowers

Pneumatic conveying: such as pipeline conveying of cement and chemical powders.

Wastewater treatment: The aeration system provides oxygen.

Industrial ventilation: high temperature furnace, mine ventilation.

2. Typical applications of vacuum fans

Vacuum packaging: Vacuum sealing of food and medicine.

Vacuum adsorption: chip handling and wood processing in the electronics industry.

Vacuum drying: Low temperature drying in the chemical and pharmaceutical industries.

4、 How to choose?

Do you need pressurized gas delivery? → Select multi-stage blower.

Do you need to evacuate or reduce the air pressure? → Select the vacuum fan.

In addition, factors such as medium characteristics (corrosiveness), pressure/vacuum requirements, energy consumption, and maintenance costs need to be considered.

5、 Summary

Although both multi-stage blowers and vacuum fans are used for gas transportation, multi-stage blowers focus on pressurized transportation, while vacuum fans focus on vacuuming. Choosing the right equipment can improve production efficiency and reduce energy consumption. In practical applications, some scenarios may require the combination of two devices, such as blowing products with a blower after vacuum packaging.

Do you need pressurization or vacuuming for your application scenario? Welcome to leave a message for consultation!