Roots Blower

Roots blower is a blower based on the principle of a positive displacement rotary lobe pump, which operates by pumping fluid through a cam that engages differently from a set of tension gears. The fluid is then trapped in pockets around the vanes and taken from the intake side to the exhaust side. It is also known as roots type blower, root blower and rotary lobe blower.

Roots blowers can be found anywhere air and gases need to be transported. This means in a large number of applications in industries such as food and beverage, chemicals, water, pulp and paper, mining, cement, power, metals and oil and gas.

Many industrial processes rely on air, such as combustion, vacuum, air separation, water aeration, pneumatic conveying, membrane cleaning or regeneration, to name but a few.

How does a roots blower work?

The operating process starts with the flow of air into the element chamber from the air inlet. The rotor rotates against the walls of the chambers at regular intervals to create the so-called “air flow direction”. At this point, there is still atmospheric pressure in these chambers.

Once the first blade passes through the opening on the pressure side, the system pressure is adjusted. This is called isovolumetric compression. The rotors are sealed to each other internally to prevent pressure changes.

The Roots Blower operates using the principle of isovolumetric compression, also known as external compression. The pressure increase is achieved by intermittent delivery of gaseous media into the system. The associated pressure increase is achieved by forcing the medium from atmospheric conditions into a system with a given resistance. The Roots Blower will operate at a controlled output level to overcome this resistance.


  1. Large range of air volume and pressure vacuum
  2. The exhaust gas does not contain oil
  3. The computer moves under the balance to correct a low vibration and low noise
  4. Stable air volume, Little influence of pressure change on air volume
  5. Special impeller design, high efficiency and energy saving
  6. Simple and solid structure, Trouble-free
  7. The use of primary grinding gear, high accuracy, long life, low noise
  8. Strict quality management and standardized products
  9. The latest four-axis process for impeller exploration will be in one sheet for greater precision
  10. Each blower can be equipped with a piston ring, so that the efficiency is higher and the life is longer


  • Wastewater treatment aeration
  • After combustion, dust treatment
  • Dust collecting device
  • Vacuum dewatering of dyeing, finishing and papermaking equipment
  • Desulfurization by exhaust smoke
  • Environmental regulation equipment
  • Exhaust and dry
  • Air transport
  • Special gas and granular transport
  • Aquaculture
  • Liquid stirring in the plating tank
  • Stir the liquid

Customer site cases

KUOSI is a manufacturer and supplier of environmental three lobe roots air blower in China. We also supply submersible roots blowers, the device can be installed and used underwater to cope with specific environments. If you have any questions or needs regarding roots blowers, please contact us.


Roots blower is used in many industries, among which the most common uses are: chemical smelting, sewage aeration, aquaculture, desulfurization and oxidation, powder transport and so on.

  1. Roots blower in the chemical industry
    Roots fan is widely used in the chemical industry. According to the different working conditions, it is widely used, such as conveying chemical raw materials, conveying reaction gas, aeration stirring, sewage treatment, ventilation and exhaust, gas pressurization, pulse dust removal and so on. It is often used in the pneumatic conveying performance of Roots fan.
  2. Roots blower in the sewage treatment industry
    In the sewage treatment industry, because the sewage tank needs to be pumped into oxygen for microbial oxidation and decomposition, in the sewage treatment industry, Roots fan can provide quantitative oxygen according to the different water depth and the different tonnage of water treatment, to promote the oxidation and decomposition of microorganisms.

Roots blower in sewage treatment is the core equipment, fan’s performance is able to determine the effect of sewage treatment, sewage biological method, in order to promote the growth of aerobic microorganisms, must provide enough oxygen, aerobic microorganisms can promote metabolism, decomposition suspended solids in the wastewater and organic compounds, such as nitrogen and phosphorus.

  1. Roots blower in aquaculture industry use
    There are great differences in the aquaculture industry, and Roots fan is mostly used for industrial aquaculture. For enterprises with large aquaculture area, industrial aquaculture arranges aeration tray at the bottom of the pool. After connecting the Roots fan, oxygen will be constantly supplied to the pool to improve the oxygen content of the pool.
  2. Use of Roots blower in desulfurization and oxidation
    In the desulfurization and oxidation of thermal power plants need to desulfurization of soot gas, desulfurization is operated according to the chemical method, the content of sulfur dioxide in the flue gas after the chemical reaction will be greatly reduced to meet the emission standards. In this chemical reaction process, sulfur dioxide turns into crystal and crystallizes, which requires oxygen oxidation, so Roots wind will be used to provide enough oxygen to ensure the efficient operation of the chemical reaction.
  3. The use of Roots blower in powder conveying
    Roots fan itself can not transport gas containing a large number of media, can only transport clean air, in powder transport, mainly plays the role of providing pneumatic kinetic energy, will be required to transport powder.

Roots is an American surname, originated from two American brothers named Roots, who invented the Roots fan, so it was named after them. Roots fan represents a new type of blower, this kind of fan is different from the ordinary fan on the blade, its principle is to rely on the impeller rotation to extrude air, the pressure is higher than the ordinary fan, with the characteristics of forced air supply, in many occasions can replace the air pump.

Roots blower and screw blower are positive displacement fan, the difference between the two lies in the different compression principle, screw blower energy saving, stability, low noise advantages are more prominent.

Roots blower, in the process of operation and transportation of air between the rotor cavity volume changes, the pressure from the large amount of air is forced into a smaller external cavity in the body, such as: pipe or propane tanks, increasing the density of air in the external cavity, resulting in a pressure, often called “compression”. Roots blower structure is simple, forced air supply (air supply is not affected by exhaust pressure), does not produce pressure.

The working principle of the screw blower is different from Roots blower, the air is also sucked in, and then discharged, inspirating, the cavity between the screw and the screw is large, with the rotation of the screw rotor, the volume of the cavity will gradually become smaller, when the gas is discharged, the volume of the cavity will become very small. That is to say, in the process of rotation, it is equivalent to compress 2m³ gas into 1m³ gas, and the pressure will increase accordingly. In other words, the pressure increase is not from the peripheral pipe network, but from the change of the internal cavity of the host cavity, that is, the so-called internal compression.

Roots blower is a volume blower, it is dependent on two shape is involute “8” shape rotor in the rotation of the studio volume change to transport gas, its working principle is the same as the gear pump, that is, each rotor is equivalent to only two teeth of the gear. The blower is simple in structure and convenient in manufacture. It is suitable for gas conveying and pressurizing in low pressure situations. It can also be used as a vacuum pump.

Yes, roots blower is forced compressed air for gas delivery, in the process of compression, there will be natural heat release. Therefore, the gas delivered by Roots blower will have a certain temperature. If we require the gas temperature not to be too high, we can only cool the outlet pipeline and reduce the gas temperature in the pipeline.

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